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Amphotericin B

Amphotericin B is an antifungal medication used for serious fungal infections and leishmaniasis.[3] The fungal infections it is used to treat include mucormycosis, aspergillosis, blastomycosis, candidiasis, coccidioidomycosis, and cryptococcosis.[4] For certain infections it is given with flucytosine.[5] It is typically given intravenously (injection into a vein).[4]

Amphotericin B
Clinical data
Trade namesFungizone, Mysteclin-F, AmBisome and other
AHFS/Drugs.comMonograph
MedlinePlusa682643
License data
Pregnancy
category
Routes of
administration
Intravenous infusion
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability100% (IV)
Metabolismkidney
Elimination half-life
  • Initial phase: 24 hours
  • Second phase: approximately 15 days
Excretion
  • 40% found in urine after single cumulated over several days
  • Biliar excretion also important
Identifiers
  • (1R,3S,5R,6R,9R, 11R,15S,16R,17R,18S,19E,21E, 23E,25E,27E,29E,31E,33R,35S,36R,37S)- 33-[(3-amino- 3,6-dideoxy- β-D-mannopyranosyl)oxy]- 1,3,5,6,9,11,17,37-octahydroxy- 15,16,18-trimethyl- 13-oxo- 14,39-dioxabicyclo [33.3.1] nonatriaconta- 19,21,23,25,27,29,31-heptaene- 36-carboxylic acid
CAS Number
  • 12633-72-6 Y
PubChem CID
  • 14956
DrugBank
  • DB00681 Y
ChemSpider
  • 10237579 Y
UNII
  • 7XU7A7DROE
KEGG
  • D00203 Y
ChEBI
  • CHEBI:2682 Y
ChEMBL
  • ChEMBL267345 Y
NIAID ChemDB
  • 000096
CompTox Dashboard (EPA)
  • DTXSID9022601
ECHA InfoCard100.014.311
Chemical and physical data
FormulaC47H73NO17
Molar mass924.091 g·mol−1
3D model (JSmol)
  • Interactive image
Melting point170 °C (338 °F)
  • O=C(O)[C@@H]3[C@@H](O)C[C@@]2(O)C[C@@H](O)C[C@@H](O)[C@H](O)CC[C@@H](O)C[C@@H](O)CC(=O)O[C@@H](C)[C@H](C)[C@H](O)[C@@H](C)C=CC=CC=CC=CC=CC=CC=C[C@H](O[C@@H]1O[C@H](C)[C@@H](O)[C@H](N)[C@@H]1O)C[C@@H]3O2
  • InChI=1S/C47H73NO17/c1-27-17-15-13-11-9-7-5-6-8-10-12-14-16-18-34(64-46-44(58)41(48)43(57)30(4)63-46)24-38-40(45(59)60)37(54)26-47(61,65-38)25-33(51)22-36(53)35(52)20-19-31(49)21-32(50)23-39(55)62-29(3)28(2)42(27)56/h5-18,27-38,40-44,46,49-54,56-58,61H,19-26,48H2,1-4H3,(H,59,60)/b6-5+,9-7+,10-8+,13-11+,14-12+,17-15+,18-16+/t27-,28-,29-,30+,31+,32+,33-,34-,35+,36+,37-,38-,40+,41-,42+,43+,44-,46-,47+/m0/s1 Y
  • Key:APKFDSVGJQXUKY-INPOYWNPSA-N Y
  (verify)

Common side effects include a reaction with fever, chills, and headaches soon after the medication is given, as well as kidney problems.[4] Allergic symptoms including anaphylaxis may occur.[4] Other serious side effects include low blood potassium and myocarditis (inflammation of the heart).[3] It appears to be relatively safe in pregnancy.[4] There is a lipid formulation that has a lower risk of side effects.[4] It is in the polyene class of medications and works in part by interfering with the cell membrane of the fungus.[3][4]

Amphotericin B was isolated from Streptomyces nodosus in 1955 at the Squibb For Medical Research Institute from cultures isolated from the streptomycete obtained from the river bed of Orinoco in that region of Venezuela[6] and came into medical use in 1958.[7][8] It is on the World Health Organization's List of Essential Medicines.[9] It is available as a generic medication.[4][10]

Medical uses edit

Antifungal edit

One of the main uses of amphotericin B is treating a wide range of systemic fungal infections. Due to its extensive side effects, it is often reserved for severe infections in critically ill, or immunocompromised patients. It is considered first line therapy for invasive mucormycosis infections, cryptococcal meningitis, and certain aspergillus and candidal infections.[11][12] It has been a highly effective drug for over fifty years in large part because it has a low incidence of drug resistance in the pathogens it treats. This is because amphotericin B resistance requires sacrifices on the part of the pathogen that make it susceptible to the host environment, and too weak to cause infection.[13]

Antiprotozoal edit

Amphotericin B is used for life-threatening protozoan infections such as visceral leishmaniasis[14] and primary amoebic meningoencephalitis.[15]

Spectrum of susceptibility edit

The following table shows the amphotericin B susceptibility for a selection of medically important fungi.

Available formulations edit

Intravenous edit

Amphotericin B alone is insoluble in normal saline at a pH of 7. Therefore, several formulations have been devised to improve its intravenous bioavailability.[19] Lipid-based formulations of amphotericin B are no more effective than conventional formulations, although there is some evidence that lipid-based formulations may be better tolerated by patients and may have fewer adverse effects.[20]

Deoxycholate edit

The original formulation uses sodium deoxycholate to improve solubility.[17] Amphotericin B deoxycholate (ABD) is administered intravenously.[21] As the original formulation of amphotericin, it is often referred to as "conventional" amphotericin.[22]

Liposomal edit

In order to improve the tolerability of amphotericin and reduce toxicity, several lipid formulations have been developed.[17] Liposomal formulations have been found to have less renal toxicity than deoxycholate,[23][24] and fewer infusion-related reactions.[17] They are more expensive than amphotericin B deoxycholate.[25]

AmBisome (liposomal amphotericin B; LAMB) is a liposomal formulation of amphotericin B for injection and consists of a mixture of phosphatidylcholine, cholesterol and distearoyl phosphatidylglycerol that in aqueous media spontaneously arrange into unilamellar vesicles that contain amphotericin B.[17][26] It was developed by NeXstar Pharmaceuticals (acquired by Gilead Sciences in 1999). It was approved by the FDA in 1997.[27] It is marketed by Gilead in Europe and licensed to Astellas Pharma (formerly Fujisawa Pharmaceuticals) for marketing in the US, and Sumitomo Pharmaceuticals in Japan.[citation needed]

Lipid complex formulations edit

A number of lipid complex preparations are also available. Abelcet was approved by the FDA in 1995.[28] It consists of amphotericin B and two lipids in a 1:1 ratio that form large ribbon-like structures.[17] Amphotec is a complex of amphotericin and sodium cholesteryl sulfate in a 1:1 ratio. Two molecules of each form a tetramer that aggregate into spiral arms on a disk-like complex.[26] It was approved by the FDA in 1996.[28]

By mouth edit

An oral preparation exists but is not widely available.[29] The amphipathic nature of amphotericin along with its low solubility and permeability has posed major hurdles for oral administration given its low bioavailability. In the past it had been used for fungal infections of the surface of the GI tract such as thrush, but has been replaced by other antifungals such as nystatin and fluconazole.[30]

However, recently novel nanoparticulate drug delivery systems such as AmbiOnp,[31] nanosuspensions, lipid-based drug delivery systems including cochleates, self-emulsifying drug delivery systems,[32] solid lipid nanoparticles[31] and polymeric nanoparticles[33]—such as amphotericin B in pegylated polylactide coglycolide copolymer nanoparticles[34]—have demonstrated potential for oral formulation of amphotericin B.[35] The oral lipid nanocrystal amphotericin by Matinas Biopharma is furthest along having completed a successful phase 2 clinical trial in cryptococcal meningitis.[36]

Side effects edit

Amphotericin B is well known for its severe and potentially lethal side effects, earning it the nickname "amphoterrible".[37][38] Very often, it causes a serious reaction soon after infusion (within 1 to 3 hours), consisting of high fever, shaking chills, hypotension, anorexia, nausea, vomiting, headache, dyspnea and tachypnea, drowsiness, and generalized weakness. The violent chills and fevers have caused the drug to be nicknamed "shake and bake".[39][40] The precise etiology of the reaction is unclear, although it may involve increased prostaglandin synthesis and the release of cytokines from macrophages.[41][42] Deoxycholate formulations (ABD) may also stimulate the release of histamine from mast cells and basophils.[43] Reactions sometimes subside with later applications of the drug. This nearly universal febrile response necessitates a critical (and diagnostically difficult) professional determination as to whether the onset of high fever is a novel symptom of a fast-progressing disease, or merely the effect of the drug. To decrease the likelihood and severity of the symptoms, initial doses should be low, and increased slowly. Paracetamol, pethidine, diphenhydramine, and hydrocortisone have all been used to treat or prevent the syndrome, but the prophylactic use of these drugs is often limited by the patient's condition.[44]

Intravenously administered amphotericin B in therapeutic doses has also been associated with multiple organ damage. Kidney damage is a frequently reported side effect, and can be severe and/or irreversible. Less kidney toxicity has been reported with liposomal formulations (such as AmBisome) and it has become preferred in patients with preexisting renal injury.[45][46] The integrity of the liposome is disrupted when it binds to the fungal cell wall, but is not affected by the mammalian cell membrane,[47] so the association with liposomes decreases the exposure of the kidneys to amphotericin B, which explains its less nephrotoxic effects.[48]

In addition, electrolyte imbalances such as hypokalemia and hypomagnesemia are also common.[49] In the liver, increased liver enzymes and hepatotoxicity (up to and including fulminant liver failure) are common. In the circulatory system, several forms of anemia and other blood dyscrasias (leukopenia, thrombopenia), serious cardiac arrhythmias (including ventricular fibrillation), and even frank cardiac failure have been reported. Skin reactions, including serious forms, are also possible.[citation needed]

Interactions edit

Drug-drug interactions may occur when amphorectin B is coadministered with the following agents:[50]

  • Flucytosine: Toxicity of flucytosine is increased and allows a lower dose of amphotericin B. Amphotericin B may also facilitate entry of flucystosine into the fungal cell by interfering with the permeability of the fungal cell membrane.
  • Diuretics or cisplatin: Increased renal toxicity and increased risk of hypokalemia
  • Corticosteroids: Increased risk of hypokalemia
  • Imidazole Antifungals: Amphorectin B may antagonize the activity of ketoconazole and miconazole. The clinical significance of this interaction is unknown.
  • Neuromuscular-blocking agents: Amphorectin B-induced hypokalemia may potentiate the effects of certain paralytic agents.
  • Foscarnet, ganciclovir, tenofovir, adefovir: Risk of hematological and renal side effects of amphotericin B are increased
  • Zidovudine: Increased risk of renal and hematological toxicity .
  • Other nephrotoxic drugs (such as aminoglycosides): Increased risk of serious renal damage
  • Cytostatic drugs: Increased risk of kidney damage, hypotension, and bronchospasms
  • Transfusion of leukocytes: Risk of pulmonal (lung) damage occurs, space the intervals between the application of amphotericin B and the transfusion, and monitor pulmonary function

Mechanism of action edit

Amphotericin B binds with ergosterol, a component of fungal cell membranes, forming pores that cause rapid leakage of monovalent ions (K+, Na+, H+ and Cl) and subsequent fungal cell death. This is amphotericin B's primary effect as an antifungal agent.[51][52] It has been found that the amphotericin B/ergosterol bimolecular complex that maintains these pores is stabilized by Van der Waals interactions.[53] Researchers have found evidence that amphotericin B also causes oxidative stress within the fungal cell,[54] but it remains unclear to what extent this oxidative damage contributes to the drug's effectiveness.[51] The addition of free radical scavengers or antioxidants can lead to amphotericin resistance in some species, such as Scedosporium prolificans, without affecting the cell wall.[citation needed]

Two amphotericins, amphotericin A and amphotericin B, are known, but only B is used clinically, because it is significantly more active in vivo. Amphotericin A is almost identical to amphotericin B (having a C=C double bond between the 27th and 28th carbons), but has little antifungal activity.[19]

Mechanism of toxicity edit

Mammalian and fungal membranes both contain sterols, a primary membrane target for amphotericin B. Because mammalian and fungal membranes are similar in structure and composition, this is one mechanism by which amphotericin B causes cellular toxicity. Amphotericin B molecules can form pores in the host membrane as well as the fungal membrane. This impairment in membrane barrier function can have lethal effects.[54][55][56] Ergosterol, the fungal sterol, is more sensitive to amphotericin B than cholesterol, the common mammalian sterol. Reactivity with the membrane is also sterol concentration dependent.[57] Bacteria are not affected as their cell membranes do not usually contain sterols.[citation needed]

Amphotericin B administration is limited by infusion-related toxicity. This is thought to result from innate immune production of proinflammatory cytokines.[55][58]

Biosynthesis edit

The natural route to synthesis includes polyketide synthase components.[59] The carbon chains of amphotericin B are assembled from sixteen 'C2' acetate and three 'C3'propionate units by polyketide syntheses (PKSs).[60] Polyketide biosynthesis begins with the decarboxylative condensation of a dicarboxylic acid extender unit with a starter acyl unit to form a β-ketoacyl intermediate. The growing chain is constructed by a series of Claisen reactions. Within each module, the extender units are loaded onto the current ACP domain by acetyl transferase (AT). The ACP-bound elongation group reacts in a Claisen condensation with the KS-bound polyketide chain. Ketoreductase (KR), dehydratase (DH) and enoyl reductase (ER) enzymes may also be present to form alcohol, double bonds or single bonds.[61] After cyclisation, the macrolactone core undergoes further modification by hydroxylation, methylation and glycosylation. The order of these three post-cyclization processes is unknown.[61]

History edit

It was originally extracted from Streptomyces nodosus, a filamentous bacterium, in 1955, at the Squibb Institute for Medical Research from cultures of an undescribed streptomycete isolated from the soil collected in the Orinoco River region of Venezuela.[19][62] Two antifungal substances were isolated from the soil culture, amphotericin A and amphotericin B, but B had better antifungal activity. For decades it remained the only effective therapy for invasive fungal disease until the development of the azole antifungals in the early 1980s.[21]

Its complete stereo structure was determined in 1970 by an X-ray structure of the N-iodoacetyl derivative.[60] The first synthesis of the compound's naturally occurring enantiomeric form was achieved in 1987 by K. C. Nicolaou.[63]

Formulations edit

It is a subgroup of the macrolide antibiotics, and exhibits similar structural elements.[64] Currently, the drug is available in many forms. Either "conventionally" complexed with sodium deoxycholate (ABD), as a cholesteryl sulfate complex (ABCD), as a lipid complex (ABLC), and as a liposomal formulation (LAMB). The latter formulations have been developed to improve tolerability and decrease toxicity, but may show considerably different pharmacokinetic characteristics compared to conventional amphotericin B.[17]

Names edit

Amphotericin's name originates from the chemical's amphoteric properties.[65]

It is commercially known as Fungilin, Fungizone, Abelcet, AmBisome, Fungisome, Amphocil, Amphotec, and Halizon.[66]

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  53. ^ Baran M, Borowski E, Mazerski J (May 2009). "Molecular modeling of amphotericin B-ergosterol primary complex in water II". Biophysical Chemistry. 141 (2–3): 162–168. PMID 19233539.
  54. ^ a b Baginski M, Czub J (June 2009). "Amphotericin B and its new derivatives - mode of action". Current Drug Metabolism. 10 (5): 459–469. doi:10.2174/138920009788898019. PMID 19689243.
  55. ^ a b Laniado-Laborín R, Cabrales-Vargas MN (December 2009). "Amphotericin B: side effects and toxicity". Revista Iberoamericana de Micologia. 26 (4): 223–7. doi:10.1016/j.riam.2009.06.003. PMID 19836985. S2CID 592301.
  56. ^ (PDF). Pfizer. Archived from the original (PDF) on 2011-04-19. Retrieved 2010-02-18.
  57. ^ Vertut-Croquin A, Bolard J, Chabbert M, Gary-Bobo C (June 1983). "Differences in the interaction of the polyene antibiotic amphotericin B with cholesterol- or ergosterol-containing phospholipid vesicles. A circular dichroism and permeability study". Biochemistry. 22 (12): 2939–2944. doi:10.1021/bi00281a024. PMID 6871175.
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External links edit

  • AmBisome Summaries of Product Characteristics (United Kingdom)
  • Amphotericin B
  • "Amphotericin B Liposomal Injection". MedlinePlus.
  • "Amphotericin B Lipid Complex Injection". MedlinePlus.

amphotericin, antifungal, medication, used, serious, fungal, infections, leishmaniasis, fungal, infections, used, treat, include, mucormycosis, aspergillosis, blastomycosis, candidiasis, coccidioidomycosis, cryptococcosis, certain, infections, given, with, flu. Amphotericin B is an antifungal medication used for serious fungal infections and leishmaniasis 3 The fungal infections it is used to treat include mucormycosis aspergillosis blastomycosis candidiasis coccidioidomycosis and cryptococcosis 4 For certain infections it is given with flucytosine 5 It is typically given intravenously injection into a vein 4 Amphotericin BClinical dataTrade namesFungizone Mysteclin F AmBisome and otherAHFS Drugs comMonographMedlinePlusa682643License dataUS DailyMed Amphotericin BPregnancycategoryAU B2 1 Routes ofadministrationIntravenous infusionATC codeA01AB04 WHO A07AA07 WHO G01AA03 WHO J02AA01 WHO Legal statusLegal statusUS only 2 In general Prescription only Pharmacokinetic dataBioavailability100 IV MetabolismkidneyElimination half lifeInitial phase 24 hoursSecond phase approximately 15 daysExcretion40 found in urine after single cumulated over several daysBiliar excretion also importantIdentifiersIUPAC name 1R 3S 5R 6R 9R 11R 15S 16R 17R 18S 19E 21E 23E 25E 27E 29E 31E 33R 35S 36R 37S 33 3 amino 3 6 dideoxy b D mannopyranosyl oxy 1 3 5 6 9 11 17 37 octahydroxy 15 16 18 trimethyl 13 oxo 14 39 dioxabicyclo 33 3 1 nonatriaconta 19 21 23 25 27 29 31 heptaene 36 carboxylic acidCAS Number12633 72 6 YPubChem CID14956DrugBankDB00681 YChemSpider10237579 YUNII7XU7A7DROEKEGGD00203 YChEBICHEBI 2682 YChEMBLChEMBL267345 YNIAID ChemDB000096CompTox Dashboard EPA DTXSID9022601ECHA InfoCard100 014 311Chemical and physical dataFormulaC 47H 73N O 17Molar mass924 091 g mol 13D model JSmol Interactive imageMelting point170 C 338 F SMILES O C O C H 3 C H O C C 2 O C C H O C C H O C H O CC C H O C C H O CC O O C H C C H C C H O C H C C CC CC CC CC CC CC C C H O C H 1O C H C C H O C H N C H 1O C C H 3O2InChI InChI 1S C47H73NO17 c1 27 17 15 13 11 9 7 5 6 8 10 12 14 16 18 34 64 46 44 58 41 48 43 57 30 4 63 46 24 38 40 45 59 60 37 54 26 47 61 65 38 25 33 51 22 36 53 35 52 20 19 31 49 21 32 50 23 39 55 62 29 3 28 2 42 27 56 h5 18 27 38 40 44 46 49 54 56 58 61H 19 26 48H2 1 4H3 H 59 60 b6 5 9 7 10 8 13 11 14 12 17 15 18 16 t27 28 29 30 31 32 33 34 35 36 37 38 40 41 42 43 44 46 47 m0 s1 YKey APKFDSVGJQXUKY INPOYWNPSA N Y verify Common side effects include a reaction with fever chills and headaches soon after the medication is given as well as kidney problems 4 Allergic symptoms including anaphylaxis may occur 4 Other serious side effects include low blood potassium and myocarditis inflammation of the heart 3 It appears to be relatively safe in pregnancy 4 There is a lipid formulation that has a lower risk of side effects 4 It is in the polyene class of medications and works in part by interfering with the cell membrane of the fungus 3 4 Amphotericin B was isolated from Streptomyces nodosus in 1955 at the Squibb For Medical Research Institute from cultures isolated from the streptomycete obtained from the river bed of Orinoco in that region of Venezuela 6 and came into medical use in 1958 7 8 It is on the World Health Organization s List of Essential Medicines 9 It is available as a generic medication 4 10 Contents 1 Medical uses 1 1 Antifungal 1 2 Antiprotozoal 1 3 Spectrum of susceptibility 2 Available formulations 2 1 Intravenous 2 1 1 Deoxycholate 2 1 2 Liposomal 2 1 3 Lipid complex formulations 2 2 By mouth 3 Side effects 4 Interactions 5 Mechanism of action 6 Mechanism of toxicity 7 Biosynthesis 8 History 8 1 Formulations 8 2 Names 9 References 10 External linksMedical uses editAntifungal edit One of the main uses of amphotericin B is treating a wide range of systemic fungal infections Due to its extensive side effects it is often reserved for severe infections in critically ill or immunocompromised patients It is considered first line therapy for invasive mucormycosis infections cryptococcal meningitis and certain aspergillus and candidal infections 11 12 It has been a highly effective drug for over fifty years in large part because it has a low incidence of drug resistance in the pathogens it treats This is because amphotericin B resistance requires sacrifices on the part of the pathogen that make it susceptible to the host environment and too weak to cause infection 13 Antiprotozoal edit Amphotericin B is used for life threatening protozoan infections such as visceral leishmaniasis 14 and primary amoebic meningoencephalitis 15 Spectrum of susceptibility edit The following table shows the amphotericin B susceptibility for a selection of medically important fungi Species Amphotericin B MIC breakpoint mg L Aspergillus fumigatus 1 16 Aspergillus terreus Resistant 16 17 Candida albicans 1 16 Candida glabrata 1 16 Candida krusei 1 16 Candida lusitaniae Intrinsically resistant 17 Cryptococcus neoformans 2 18 Fusarium oxysporum 2 18 Available formulations editIntravenous edit Amphotericin B alone is insoluble in normal saline at a pH of 7 Therefore several formulations have been devised to improve its intravenous bioavailability 19 Lipid based formulations of amphotericin B are no more effective than conventional formulations although there is some evidence that lipid based formulations may be better tolerated by patients and may have fewer adverse effects 20 Deoxycholate edit The original formulation uses sodium deoxycholate to improve solubility 17 Amphotericin B deoxycholate ABD is administered intravenously 21 As the original formulation of amphotericin it is often referred to as conventional amphotericin 22 Liposomal edit In order to improve the tolerability of amphotericin and reduce toxicity several lipid formulations have been developed 17 Liposomal formulations have been found to have less renal toxicity than deoxycholate 23 24 and fewer infusion related reactions 17 They are more expensive than amphotericin B deoxycholate 25 AmBisome liposomal amphotericin B LAMB is a liposomal formulation of amphotericin B for injection and consists of a mixture of phosphatidylcholine cholesterol and distearoyl phosphatidylglycerol that in aqueous media spontaneously arrange into unilamellar vesicles that contain amphotericin B 17 26 It was developed by NeXstar Pharmaceuticals acquired by Gilead Sciences in 1999 It was approved by the FDA in 1997 27 It is marketed by Gilead in Europe and licensed to Astellas Pharma formerly Fujisawa Pharmaceuticals for marketing in the US and Sumitomo Pharmaceuticals in Japan citation needed Lipid complex formulations edit A number of lipid complex preparations are also available Abelcet was approved by the FDA in 1995 28 It consists of amphotericin B and two lipids in a 1 1 ratio that form large ribbon like structures 17 Amphotec is a complex of amphotericin and sodium cholesteryl sulfate in a 1 1 ratio Two molecules of each form a tetramer that aggregate into spiral arms on a disk like complex 26 It was approved by the FDA in 1996 28 By mouth edit An oral preparation exists but is not widely available 29 The amphipathic nature of amphotericin along with its low solubility and permeability has posed major hurdles for oral administration given its low bioavailability In the past it had been used for fungal infections of the surface of the GI tract such as thrush but has been replaced by other antifungals such as nystatin and fluconazole 30 However recently novel nanoparticulate drug delivery systems such as AmbiOnp 31 nanosuspensions lipid based drug delivery systems including cochleates self emulsifying drug delivery systems 32 solid lipid nanoparticles 31 and polymeric nanoparticles 33 such as amphotericin B in pegylated polylactide coglycolide copolymer nanoparticles 34 have demonstrated potential for oral formulation of amphotericin B 35 The oral lipid nanocrystal amphotericin by Matinas Biopharma is furthest along having completed a successful phase 2 clinical trial in cryptococcal meningitis 36 Side effects editAmphotericin B is well known for its severe and potentially lethal side effects earning it the nickname amphoterrible 37 38 Very often it causes a serious reaction soon after infusion within 1 to 3 hours consisting of high fever shaking chills hypotension anorexia nausea vomiting headache dyspnea and tachypnea drowsiness and generalized weakness The violent chills and fevers have caused the drug to be nicknamed shake and bake 39 40 The precise etiology of the reaction is unclear although it may involve increased prostaglandin synthesis and the release of cytokines from macrophages 41 42 Deoxycholate formulations ABD may also stimulate the release of histamine from mast cells and basophils 43 Reactions sometimes subside with later applications of the drug This nearly universal febrile response necessitates a critical and diagnostically difficult professional determination as to whether the onset of high fever is a novel symptom of a fast progressing disease or merely the effect of the drug To decrease the likelihood and severity of the symptoms initial doses should be low and increased slowly Paracetamol pethidine diphenhydramine and hydrocortisone have all been used to treat or prevent the syndrome but the prophylactic use of these drugs is often limited by the patient s condition 44 Intravenously administered amphotericin B in therapeutic doses has also been associated with multiple organ damage Kidney damage is a frequently reported side effect and can be severe and or irreversible Less kidney toxicity has been reported with liposomal formulations such as AmBisome and it has become preferred in patients with preexisting renal injury 45 46 The integrity of the liposome is disrupted when it binds to the fungal cell wall but is not affected by the mammalian cell membrane 47 so the association with liposomes decreases the exposure of the kidneys to amphotericin B which explains its less nephrotoxic effects 48 In addition electrolyte imbalances such as hypokalemia and hypomagnesemia are also common 49 In the liver increased liver enzymes and hepatotoxicity up to and including fulminant liver failure are common In the circulatory system several forms of anemia and other blood dyscrasias leukopenia thrombopenia serious cardiac arrhythmias including ventricular fibrillation and even frank cardiac failure have been reported Skin reactions including serious forms are also possible citation needed Interactions editDrug drug interactions may occur when amphorectin B is coadministered with the following agents 50 Flucytosine Toxicity of flucytosine is increased and allows a lower dose of amphotericin B Amphotericin B may also facilitate entry of flucystosine into the fungal cell by interfering with the permeability of the fungal cell membrane Diuretics or cisplatin Increased renal toxicity and increased risk of hypokalemia Corticosteroids Increased risk of hypokalemia Imidazole Antifungals Amphorectin B may antagonize the activity of ketoconazole and miconazole The clinical significance of this interaction is unknown Neuromuscular blocking agents Amphorectin B induced hypokalemia may potentiate the effects of certain paralytic agents Foscarnet ganciclovir tenofovir adefovir Risk of hematological and renal side effects of amphotericin B are increased Zidovudine Increased risk of renal and hematological toxicity Other nephrotoxic drugs such as aminoglycosides Increased risk of serious renal damage Cytostatic drugs Increased risk of kidney damage hypotension and bronchospasms Transfusion of leukocytes Risk of pulmonal lung damage occurs space the intervals between the application of amphotericin B and the transfusion and monitor pulmonary functionMechanism of action editAmphotericin B binds with ergosterol a component of fungal cell membranes forming pores that cause rapid leakage of monovalent ions K Na H and Cl and subsequent fungal cell death This is amphotericin B s primary effect as an antifungal agent 51 52 It has been found that the amphotericin B ergosterol bimolecular complex that maintains these pores is stabilized by Van der Waals interactions 53 Researchers have found evidence that amphotericin B also causes oxidative stress within the fungal cell 54 but it remains unclear to what extent this oxidative damage contributes to the drug s effectiveness 51 The addition of free radical scavengers or antioxidants can lead to amphotericin resistance in some species such as Scedosporium prolificans without affecting the cell wall citation needed Two amphotericins amphotericin A and amphotericin B are known but only B is used clinically because it is significantly more active in vivo Amphotericin A is almost identical to amphotericin B having a C C double bond between the 27th and 28th carbons but has little antifungal activity 19 Mechanism of toxicity editMammalian and fungal membranes both contain sterols a primary membrane target for amphotericin B Because mammalian and fungal membranes are similar in structure and composition this is one mechanism by which amphotericin B causes cellular toxicity Amphotericin B molecules can form pores in the host membrane as well as the fungal membrane This impairment in membrane barrier function can have lethal effects 54 55 56 Ergosterol the fungal sterol is more sensitive to amphotericin B than cholesterol the common mammalian sterol Reactivity with the membrane is also sterol concentration dependent 57 Bacteria are not affected as their cell membranes do not usually contain sterols citation needed Amphotericin B administration is limited by infusion related toxicity This is thought to result from innate immune production of proinflammatory cytokines 55 58 Biosynthesis editThe natural route to synthesis includes polyketide synthase components 59 The carbon chains of amphotericin B are assembled from sixteen C2 acetate and three C3 propionate units by polyketide syntheses PKSs 60 Polyketide biosynthesis begins with the decarboxylative condensation of a dicarboxylic acid extender unit with a starter acyl unit to form a b ketoacyl intermediate The growing chain is constructed by a series of Claisen reactions Within each module the extender units are loaded onto the current ACP domain by acetyl transferase AT The ACP bound elongation group reacts in a Claisen condensation with the KS bound polyketide chain Ketoreductase KR dehydratase DH and enoyl reductase ER enzymes may also be present to form alcohol double bonds or single bonds 61 After cyclisation the macrolactone core undergoes further modification by hydroxylation methylation and glycosylation The order of these three post cyclization processes is unknown 61 History editIt was originally extracted from Streptomyces nodosus a filamentous bacterium in 1955 at the Squibb Institute for Medical Research from cultures of an undescribed streptomycete isolated from the soil collected in the Orinoco River region of Venezuela 19 62 Two antifungal substances were isolated from the soil culture amphotericin A and amphotericin B but B had better antifungal activity For decades it remained the only effective therapy for invasive fungal disease until the development of the azole antifungals in the early 1980s 21 Its complete stereo structure was determined in 1970 by an X ray structure of the N iodoacetyl derivative 60 The first synthesis of the compound s naturally occurring enantiomeric form was achieved in 1987 by K C Nicolaou 63 Formulations edit It is a subgroup of the macrolide antibiotics and exhibits similar structural elements 64 Currently the drug is available in many forms Either conventionally complexed with sodium deoxycholate ABD as a cholesteryl sulfate complex ABCD as a lipid complex ABLC and as a liposomal formulation LAMB The latter formulations have been developed to improve tolerability and decrease toxicity but may show considerably different pharmacokinetic characteristics compared to conventional amphotericin B 17 Names edit Amphotericin s name originates from the chemical s amphoteric properties 65 It is commercially known as Fungilin Fungizone Abelcet AmBisome Fungisome Amphocil Amphotec and Halizon 66 References edit Updates to the Prescribing Medicines in Pregnancy database Therapeutic Goods Administration TGA 12 May 2022 Retrieved 13 May 2022 Ambisome amphotericin b injection powder lyophilized for solution DailyMed Retrieved 11 August 2021 a b c World Health Organization March 2010 Control of the leishmaniasis report of a meeting of the WHO Expert Committee on the Control of Leishmaniases Geneva World Health Organization pp 55 88 186 hdl 10665 44412 ISBN 9789241209496 a b c d e f g h Amphotericin B The American Society of Health System Pharmacists Archived from the original on 2015 01 01 Retrieved January 1 2015 World Health Organization 2009 Stuart MC Kouimtzi M Hill SR eds WHO Model Formulary 2008 World Health Organization p 145 hdl 10665 44053 ISBN 9789241547659 Velazquez L 1976 Farmacologia y su proyeccion a la clinica 13a ed in Spanish Oteo p 966 ISBN 8485152050 Walker SR 2012 Trends and Changes in Drug Research and Development Springer Science amp Business Media p 109 ISBN 9789400926592 Archived from the original on 2017 09 10 Fischer J Ganellin CR 2006 Analogue based Drug Discovery John Wiley amp Sons p 477 ISBN 9783527607495 World Health Organization 2019 World Health Organization model list of essential medicines 21st list 2019 Geneva World Health Organization hdl 10665 325771 WHO MVP EMP IAU 2019 06 License CC BY NC SA 3 0 IGO Competitive Generic Therapy Approvals U S Food and Drug Administration FDA 29 June 2023 Archived from the original on 29 June 2023 Retrieved 29 June 2023 Bennett JE Dolin R Blaser MJ 28 August 2014 Drugs Active against Fungi Pneumocystis and Microsporidia Elsevier Health Sciences pp 479 494 e4 ISBN 978 1 4557 4801 3 Moen MD Lyseng Williamson KA Scott LJ 2012 09 17 Liposomal amphotericin B a review of its use as empirical therapy in febrile neutropenia and in the treatment of invasive fungal infections Drugs 69 3 361 392 doi 10 2165 00003495 200969030 00010 PMID 19275278 S2CID 34340503 Rura N 2013 10 29 Understanding the evolution of drug resistance points to novel strategy for developing better antimicrobials Archived from the original on 2016 11 15 Retrieved 2016 11 14 via Whitehead Institute den Boer M Davidson RN April 2006 Treatment options for visceral leishmaniasis Expert Review of Anti Infective Therapy 4 2 187 197 doi 10 1586 14787210 4 2 187 PMID 16597201 S2CID 42784356 Grace E Asbill S Virga K November 2015 Naegleria fowleri pathogenesis diagnosis and treatment options Antimicrobial Agents and Chemotherapy 59 11 6677 6681 doi 10 1128 AAC 01293 15 PMC 4604384 PMID 26259797 a b c d e European Committee on Antimicrobial Susceptibility Testing 2015 11 16 Antifungal Agents Breakpoint tables for interpretation of MICs PDF Retrieved 2015 11 17 a b c d e f g h Hamill RJ June 2013 Amphotericin B formulations a comparative review of efficacy and toxicity Drugs 73 9 919 934 doi 10 1007 s40265 013 0069 4 PMID 23729001 S2CID 2785865 a b Index The Antimicrobial Index Knowledgebase TOKU E antibiotics toku e com Archived from the original on 2015 11 09 Retrieved 2015 11 17 a b c Dutcher JD October 1968 The discovery and development of amphotericin B Diseases of the Chest 54 Supplement 1 296 298 doi 10 1378 chest 54 Supplement 1 296 PMID 4877964 Steimbach Laiza M Fernanda S Tonin Suzane Virtuoso Helena HL Borba Andreia CC Sanches Astrid Wiens Fernando Fernandez Llimos and Roberto Pontarolo Efficacy and safety of amphotericin B lipid based formulations A systematic review and meta analysis Mycoses 60 no 3 2017 146 154 a b Maertens JA March 2004 History of the development of azole derivatives Clinical Microbiology and Infection 10 Suppl 1 1 10 doi 10 1111 j 1470 9465 2004 00841 x PMID 14748798 Clemons KV Stevens DA April 1998 Comparison of fungizone Amphotec AmBisome and Abelcet for treatment of systemic murine cryptococcosis Antimicrobial Agents and Chemotherapy 42 4 899 902 doi 10 1128 AAC 42 4 899 PMC 105563 PMID 9559804 Botero Aguirre JP Restrepo Hamid AM November 2015 Amphotericin B deoxycholate versus liposomal amphotericin B effects on kidney function The Cochrane Database of Systematic Reviews 2015 11 CD010481 doi 10 1002 14651858 cd010481 pub2 PMC 10542271 PMID 26595825 Mistro S Maciel I de Menezes RG Maia ZP Schooley RT Badaro R June 2012 Does lipid emulsion reduce amphotericin B nephrotoxicity A systematic review and meta analysis Clinical Infectious Diseases 54 12 1774 1777 doi 10 1093 cid cis290 PMID 22491505 Bennett J November 2000 Editorial response choosing amphotericin B formulations between a rock and a hard place Clinical Infectious Diseases 31 5 1164 1165 doi 10 1086 317443 PMID 11073746 a b Slain D March 1999 Lipid based amphotericin B for the treatment of fungal infections Pharmacotherapy 19 3 306 323 doi 10 1592 phco 19 4 306 30934 PMID 10221369 S2CID 43479677 Drug Approval Package www accessdata fda gov Archived from the original on 2015 11 17 Retrieved 2015 11 03 a b Drugs FDA FDA Approved Drug Products www accessdata fda gov Archived from the original on 2014 08 13 Retrieved 2015 11 03 Wasan KM Wasan EK Gershkovich P Zhu X Tidwell RR Werbovetz KA et al August 2009 Highly effective oral amphotericin B formulation against murine visceral leishmaniasis The Journal of Infectious Diseases 200 3 357 360 doi 10 1086 600105 PMID 19545212 Pappas PG Kauffman CA Andes D Benjamin DK Calandra TF Edwards JE et al March 2009 Clinical practice guidelines for the management of candidiasis 2009 update by the Infectious Diseases Society of America Clinical Infectious Diseases 48 5 503 535 doi 10 1086 596757 PMC 7294538 PMID 19191635 a b Patel PA Patravale VB October 2011 AmbiOnp solid lipid nanoparticles of amphotericin B for oral administration Journal of Biomedical Nanotechnology 7 5 632 639 doi 10 1166 jbn 2011 1332 PMID 22195480 Wasan EK Bartlett K Gershkovich P Sivak O Banno B Wong Z et al May 2009 Development and characterization of oral lipid based amphotericin B formulations with enhanced drug solubility stability and antifungal activity in rats infected with Aspergillus fumigatus or Candida albicans International Journal of Pharmaceutics 372 1 2 76 84 doi 10 1016 j ijpharm 2009 01 003 PMID 19236839 Italia JL Yahya MM Singh D Ravi Kumar MN June 2009 Biodegradable nanoparticles improve oral bioavailability of amphotericin B and show reduced nephrotoxicity compared to intravenous Fungizone Pharmaceutical Research 26 6 1324 1331 doi 10 1007 s11095 009 9841 2 PMID 19214716 S2CID 8612917 Al Quadeib BT Radwan MA Siller L Horrocks B Wright MC July 2015 Stealth Amphotericin B nanoparticles for oral drug delivery In vitro optimization Saudi Pharmaceutical Journal 23 3 290 302 doi 10 1016 j jsps 2014 11 004 PMC 4475820 PMID 26106277 Patel PA Fernandes CB Pol AS Patravale VB 2013 Oral amphotericin B challenges and avenues Int J Pharm Biosci Technol 1 1 1 9 Boulware DR Atukunda M Kagimu E Musubire AK Akampurira A Tugume L et al August 2023 Oral Lipid Nanocrystal Amphotericin B for Cryptococcal Meningitis A Randomized Clinical Trial Clinical Infectious Diseases 77 12 1659 1667 doi 10 1093 cid ciad440 PMC 10724459 PMID 37606364 Carr JR Hawkins WA Newsome AS Smith SE Amber BC Bland CM et al October 2022 Fluid Stewardship of Maintenance Intravenous Fluids Journal of Pharmacy Practice 35 5 769 782 doi 10 1177 08971900211008261 PMC 8497650 PMID 33827313 Mourad A Perfect JR January 2018 Tolerability profile of the current antifungal armoury The Journal of Antimicrobial Chemotherapy 73 suppl 1 i26 i32 doi 10 1093 jac dkx446 PMC 6636388 PMID 29304209 Shake and Bake TheFreeDictionary com Retrieved 2016 12 09 Hartsel SC Studies on Amphotericin B PDF Chem 491 Chemistry Department University of Wisconsin Eau Claire Archived PDF from the original on 20 December 2016 Retrieved 8 December 2016 Gigliotti F Shenep JL Lott L Thornton D November 1987 Induction of prostaglandin synthesis as the mechanism responsible for the chills and fever produced by infusing amphotericin B The Journal of Infectious Diseases 156 5 784 789 doi 10 1093 infdis 156 5 784 PMID 3309074 Sau K Mambula SS Latz E Henneke P Golenbock DT Levitz SM September 2003 The antifungal drug amphotericin B promotes inflammatory cytokine release by a Toll like receptor and CD14 dependent mechanism The Journal of Biological Chemistry 278 39 37561 37568 doi 10 1074 jbc M306137200 PMID 12860979 Baronti R Masini E Bacciottini L Mannaioni PF May 2002 Differential effects of amphotericin B and liposomal amphotericin B on inflammatory cells in vitro Inflammation Research 51 5 259 264 doi 10 1007 pl00000302 PMID 12056514 S2CID 2124507 Goodwin SD Cleary JD Walawander CA Taylor JW Grasela TH April 1995 Pretreatment regimens for adverse events related to infusion of amphotericin B Clinical Infectious Diseases 20 4 755 761 doi 10 1093 clinids 20 4 755 PMID 7795069 Walsh TJ Finberg RW Arndt C Hiemenz J Schwartz C Bodensteiner D et al March 1999 Liposomal amphotericin B for empirical therapy in patients with persistent fever and neutropenia National Institute of Allergy and Infectious Diseases Mycoses Study Group The New England Journal of Medicine 340 10 764 771 doi 10 1056 NEJM199903113401004 PMID 10072411 Perfect JR Dismukes WE Dromer F Goldman DL Graybill JR Hamill RJ et al February 2010 Clinical practice guidelines for the management of cryptococcal disease 2010 update by the infectious diseases society of america Clinical Infectious Diseases 50 3 291 322 doi 10 1086 649858 PMC 5826644 PMID 20047480 Jill Adler Moore and Richard T liposomal formulation structure mechanism of action and pre clinical experience Journal of Antimicrobial Chemotherapy 2002 49 21 30 J Czub M Baginski Amphotericin B and Its New Derivatives Mode of action Department of pharmaceutical Technology and Biochemistry Faculty of Chemistry Gdnsk University of Technology 2009 10 459 469 Zietse R Zoutendijk R Hoorn EJ April 2009 Fluid electrolyte and acid base disorders associated with antibiotic therapy Nature Reviews Nephrology 5 4 193 202 doi 10 1038 nrneph 2009 17 PMID 19322184 S2CID 24486546 Abelcet Package Insert PDF Leadiant Biosciences Sigma Tau Pharmaceuticals Retrieved 14 July 2022 a b Mesa Arango AC Scorzoni L Zaragoza O 2012 01 01 It only takes one to do many jobs Amphotericin B as antifungal and immunomodulatory drug Frontiers in Microbiology 3 286 doi 10 3389 fmicb 2012 00286 PMC 3441194 PMID 23024638 O Keeffe J Doyle S Kavanagh K December 2003 Exposure of the yeast Candida albicans to the anti neoplastic agent adriamycin increases the tolerance to amphotericin B PDF The Journal of Pharmacy and Pharmacology 55 12 1629 1633 doi 10 1211 0022357022359 PMID 14738588 S2CID 38893122 Baran M Borowski E Mazerski J May 2009 Molecular modeling of amphotericin B ergosterol primary complex in water II Biophysical Chemistry 141 2 3 162 168 PMID 19233539 a b Baginski M Czub J June 2009 Amphotericin B and its new derivatives mode of action Current Drug Metabolism 10 5 459 469 doi 10 2174 138920009788898019 PMID 19689243 a b Laniado Laborin R Cabrales Vargas MN December 2009 Amphotericin B side effects and toxicity Revista Iberoamericana de Micologia 26 4 223 7 doi 10 1016 j riam 2009 06 003 PMID 19836985 S2CID 592301 Amphocin amphotericin B for injection USP PDF Pfizer Archived from the original PDF on 2011 04 19 Retrieved 2010 02 18 Vertut Croquin A Bolard J Chabbert M Gary Bobo C June 1983 Differences in the interaction of the polyene antibiotic amphotericin B with cholesterol or ergosterol containing phospholipid vesicles A circular dichroism and permeability study Biochemistry 22 12 2939 2944 doi 10 1021 bi00281a024 PMID 6871175 Drew RH Kauffman CA Thorner AR Pharmacology of amphotericin B UpToDate MA Waltham Khan N Rawlings B Caffrey P June 2011 A labile point in mutant amphotericin polyketide synthases Biotechnology Letters 33 6 1121 1126 doi 10 1007 s10529 011 0538 3 PMID 21267757 S2CID 10209476 a b McNamara C Crawforth J Hickman B Norwood T Rawlings B January 1998 Biosynthesis of amphotericin B PDF Journal of the Chemical Society Perkin Transactions 1 thesis 1 83 88 doi 10 1039 A704545J hdl 2381 33805 Archived from the original PDF on 2017 09 21 Retrieved 2018 05 16 a b Caffrey P Lynch S Flood E Finnan S Oliynyk M July 2001 Amphotericin biosynthesis in Streptomyces nodosus deductions from analysis of polyketide synthase and late genes Chemistry amp Biology 8 7 713 723 doi 10 1016 S1074 5521 01 00046 1 PMID 11451671 Procopio RE Silva IR Martins MK Azevedo JL Araujo JM 2012 Antibiotics produced by Streptomyces The Brazilian Journal of Infectious Diseases 16 5 466 471 doi 10 1016 j bjid 2012 08 014 PMID 22975171 Nicolaou KC Daines RA Chakraborty TK Ogawa Y 1987 04 01 Total synthesis of amphotericin B Journal of the American Chemical Society 109 9 2821 2822 doi 10 1021 ja00243a043 ISSN 0002 7863 Chemistry and Biology of the Polyene Macrolide Antibiotics Bacteriological Reviews 32 Christine D Waugh in xPharm The Comprehensive Pharmacology Reference 2007 Halizon Edu drugs Archived from the original on 2016 11 15 Retrieved 2016 11 14 External links editAmBisome Summaries of Product Characteristics United Kingdom Amphotericin B Amphotericin B Liposomal Injection MedlinePlus Amphotericin B Lipid Complex Injection MedlinePlus Portal nbsp Medicine Retrieved from https en wikipedia org w index php title Amphotericin B amp oldid 1216643910 Deoxycholate, wikipedia, wiki, book, books, library,

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