Gentamicin

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Gentamicin
Gentamicin C2.svg
Gentamicin.png
Clinical data
Pronunciation /ˌdʒɛntəˈmaɪsən/
Trade names Cidomycin, Genticyn, Garamycin, others
AHFS/Drugs.com Monograph
MedlinePlus a682275
License data
Pregnancy
category
Routes of
administration 		Intravenous, eye drop, Intramuscular injection, Topical administration, ear drop
Drug class Aminoglycoside antibiotic
ATC code
Legal status
Legal status
  • US: WARNING [2]
  • EU:Rx-only [3]
  • In general: ℞ (Prescription only)
Pharmacokinetic data
Bioavailability limited bioavailability by mouth
Protein binding 0–10%
Elimination half-life 2 h
Excretion Kidney
Identifiers
  • (3R,4R,5R)-2-{[(1S,2S,3R,4S,6R)-4,6-
    diamino-3-{[(2R,3R,6S)-
    3-amino-6-[(1R)-
    1-(methylamino)ethyl]oxan-2-yl]oxy}-
    2-hydroxycyclohexyl]oxy}-5-methyl-
    4-(methylamino)oxane-3,5-diol
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard 100.014.332 OOjs UI icon edit-ltr-progressive.svg
Chemical and physical data
Formula C21H43N5O7
Molar mass 477.603 g·mol−1
3D model (JSmol)
  • O[C@]3(C)[C@H](NC)[C@@H](O)[C@@H](O[C@H]2[C@H](N)C[C@H](N)[C@@H](O[C@H]1O[C@H](C(NC)C)CC[C@H]1N)[C@@H]2O)OC3
  • InChI=1S/C21H43N5O7/c1-9(25-3)13-6-5-10(22)19(31-13)32-16-11(23)7-12(24)17(14(16)27)33-20-15(28)18(26-4)21(2,29)8-30-20/h9-20,25-29H,5-8,22-24H2,1-4H3/t9?,10-,11+,12-,13+,14+,15-,16-,17+,18-,19-,20-,21+/m1/s1 Yes check.svgY
  • Key:CEAZRRDELHUEMR-URQXQFDESA-N Yes check.svgY
 X mark.svgNYes check.svgY  (what is this?)    (verify)
Gentamicin
Hazards [4]
GHS labelling:
GHS-pictogram-silhouette.svg GHS-pictogram-exclam.svg GHS-pictogram-pollu.svg
H317, H334, H360, H360D, H372, H410
P203, P233, P260, P264, P270, P271, P272, P273, P280, P284, P302, P304, P316, P317, P318, P319, P321, P333, P340, P342, P352, P362, P364, P391, P403, P405, P501

Gentamicin is an aminoglycoside antibiotic used to treat several types of bacterial infections. [5] This may include bone infections, endocarditis, pelvic inflammatory disease, meningitis, pneumonia, urinary tract infections, and sepsis among others. [5] It is not effective for gonorrhea or chlamydia infections. [5] It can be given intravenously, by intramuscular injection, or topically. [5] Topical formulations may be used in burns or for infections of the outside of the eye. [6] It is often only used for two days until bacterial cultures determine what specific antibiotics the infection is sensitive to. [7] The dose required should be monitored by blood testing. [5]

Contents

Gentamicin can cause inner ear problems and kidney problems. [5] The inner ear problems can include problems with balance and hearing loss. [5] These problems may be permanent. [5] If used during pregnancy, it can cause harm to the developing fetus. [5] However, it appears to be safe for use during breastfeeding. [8] Gentamicin is a type of aminoglycoside [5] and works by disrupting the ability of the bacteria to make proteins, which typically kills the bacteria. [5]

Gentamicin is naturally produced by the bacterium Micromonospora purpurea , [9] [5] was patented in 1962, approved for medical use in 1964. [10] The antibiotic is collected from the culture of the Micromonospora by perforating the cell wall of the bacterium. Current research is underway to understand the biosynthesis of this antibiotic in an attempt to increase expression and force secretion of gentamicin for higher titer. Gentamicin is on the World Health Organization's List of Essential Medicines. [11] The World Health Organization classifies gentamicin as critically important for human medicine. [12] It is available as a generic medication. [13]

Medical uses

Gentamicin is active against a wide range of bacterial infections, mostly Gram-negative bacteria including Pseudomonas , Proteus , Escherichia coli , Klebsiella pneumoniae , Enterobacter aerogenes, Serratia , and the Gram-positive Staphylococcus . [14] Gentamicin is used in the treatment of respiratory tract infections, urinary tract infections, blood, bone and soft tissue infections of these susceptible bacteria. [15]

There is insufficient evidence to support gentamicin as the first line treatment of Neisseria gonorrhoeae infection. [16] Gentamicin is not used for Neisseria meningitidis or Legionella pneumophila bacterial infections (because of the risk of the person going into shock from lipid A endotoxin found in certain Gram-negative organisms). Gentamicin is also useful against Yersinia pestis (responsible for plague), its relatives, and Francisella tularensis (the organism responsible for tularemia often seen in hunters and trappers). [17]

Some Enterobacteriaceae , Pseudomonas spp., Enterococcus spp., Staphylococcus aureus and other Staphylococcus spp. have varying degrees of resistance to gentamicin. [18]

Special populations

Pregnancy and breastfeeding

Gentamicin is not recommended in pregnancy unless the benefits outweigh the risks for the mother. Gentamicin can cross the placenta and several reports of irreversible bilateral congenital deafness in children have been seen. Intramuscular injection of gentamicin in mothers can cause muscle weakness in the newborn. [15]

The safety and efficacy for gentamicin in nursing mothers has not been established. Detectable gentamicin levels are found in human breast milk and in nursing babies. [15]

Elderly

In the elderly, renal function should be assessed before beginning therapy as well as during treatment due to a decline in glomerular filtration rate. Gentamicin levels in the body can remain higher for a longer period of time in this population. Gentamicin should be used cautiously in persons with renal, auditory, vestibular, or neuromuscular dysfunction. [14]

Children

Gentamicin may not be appropriate to use in children, including babies. Studies have shown higher serum levels and a longer half-life in this population. [19] Kidney function should be checked periodically during therapy. Long-term effects of treatment can include hearing loss and balance problems. Hypocalcemia, hypokalemia, and muscle weakness have been reported when used by injection. [14]

Contraindications

Gentamicin should not be used if a person has a history of hypersensitivity, such as anaphylaxis, or other serious toxic reaction to gentamicin or any other aminoglycosides. [15] Greater care is required in people with myasthenia gravis and other neuromuscular disorders as there is a risk of worsening weakness. [5] Gentamicin should also be avoided when prescribing empirical antibiotics in the setting of possible infant botulism (Ampicillin with Gentamicin is commonly used as empiric therapy in infants) also due to worsening of neuromuscular function. [20]

Adverse effects

Adverse effects of gentamicin can range from less severe reactions, such as nausea and vomiting, to more severe reactions including: [14]

Nephrotoxicity and ototoxicity are thought to be dose related with higher doses causing greater chance of toxicity. [14] These two toxicities may have delayed presentation, sometimes not appearing until after completing treatment. [14]

Kidney damage

Kidney damage is a problem in 10–25% of people who receive aminoglycosides, and gentamicin is one of the most nephrotoxic drugs of this class. [21] Oftentimes, acute nephrotoxicity is reversible, but it may be fatal. [14] The risk of nephrotoxicity can be affected by the dose, frequency, duration of therapy, and concurrent use of certain medications, such as NSAIDs, diuretics, cisplatin, ciclosporin, cephalosporins, amphotericin, iodide contrast media, and vancomycin. [21]

Factors that increase risk of nephrotoxicity include: [21]

Kidney dysfunction is monitored by measuring creatinine in the blood, electrolyte levels, urine output, presence of protein in the urine, and concentrations of other chemicals, such as urea, in the blood. [21]

Inner ear

About 11% of the population who receives aminoglycosides experience damage to their inner ear. [22] The common symptoms of inner ear damage include tinnitus, hearing loss, vertigo, trouble with coordination, and dizziness. [23] Chronic use of gentamicin can affect two areas of the ears. First, damage of the inner ear hair cells can result in irreversible hearing loss. Second, damage to the inner ear vestibular apparatus can lead to balance problems. [23] To reduce the risk of ototoxicity during treatment, it is recommended to stay hydrated. [14]

Factors that increase the risk of inner ear damage include: [14] [15]

Pharmacology

Mechanism of action

Gentamicin is a bactericidal antibiotic that works by binding the 30S subunit of the bacterial ribosome, negatively impacting protein synthesis. The primary mechanism of action is generally accepted to work through ablating the ability of the ribosome to discriminate on proper transfer RNA and messenger RNA interactions. [24] Typically, if an incorrect tRNA pairs with an mRNA codon at the aminoacyl site of the ribosome, adenosines 1492 and 1493 are excluded from the interaction and retract, signaling the ribosome to reject the aminoacylated tRNA::Elongation Factor Thermo-Unstable complex. [25] However, when gentamicin binds at helix 44 of the 16S rRNA, it forces the adenosines to maintain the position they take when there is a correct, or cognate, match between aa-tRNA and mRNA. [26] This leads to the acceptance of incorrect aa-tRNAs, causing the ribosome to synthesize proteins with wrong amino acids placed throughout (roughly every 1 in 500). [27] The non-functional, mistranslated proteins misfold and aggregate, eventually leading to death of the bacterium. Moreover, it has been observed that gentamicin can cause a substantial slowdown in the overall elongation rate of peptide chains in live bacterial cells, independent of the misincorporation of amino acids. [28] This finding indicates that gentamicin not only induces errors in protein synthesis but also broadly hampers the efficiency of the translation process itself. An additional mechanism has been proposed based on crystal structures of gentamicin in a secondary binding site at helix 69 of the 23S rRNA, which interacts with helix 44 and proteins that recognize stop codons. At this secondary site, gentamicin is believed to preclude interactions of the ribosome with ribosome recycling factors, causing the two subunits of the ribosome to stay complexed even after translation completes, creating a pool of inactive ribosomes that can no longer re-initiate and translate new proteins. [29]

Chemistry

Structure

FixedC1primeStereospecific Gentamicin IUPAC Numbered copy.png

Since gentamicin is derived from the species Micromonospora , the backbone for this antibiotic is the aminocyclitol 2-deoxystreptamine. [30] [31] This six carbon ring is substituted at the carbon positions 4 and 6 by the amino sugar molecules cyclic purpurosamine and garosamine, respectively. [32] [30] The gentamicin complex, is differentiated into five major components (C1, C1a, C2, C2a, C2b) and multiple minor components by substitution at the 6' carbon of the purpurosamine unit indicated in the image to the right by R1 and R2. [32] [30] [33] [34] The R1 and R2 can have the follow substitutions for some of the species in the gentamicin complex. [32] [35] [31]

Major component
C complexR1R2
C1 Methyl group Methyl group
C1a Hydrogen Hydrogen
C2 Hydrogen Methyl group
C2a Hydrogen Methyl group
C2b Methyl group Hydrogen

Gentamicins consist of three hexosamines: gentosamine/garosamine, 2-deoxystreptamine, and purpurosamine (see illustrations, from left to right). [36] [37]

Gentamicine
NameStructure CAS number PubChem Sum formulaMolar mass
  • Gentamicin A
 Gentamicin A.svg 13291-74-2 CID 86474 from PubChem C18H36N4O10468.50 g·mol−1
  • Gentamicin A1
 Gentamicin A1.svg
  • Gentamicin A2
 Gentamicin A2.svg 55715-66-7 CID 86489 from PubChem C17H33N3O11455.46 g·mol−1
  • Gentamicin A3
 Gentamicin A3.svg 55715-67-8 CID 86490 from PubChem C18H36N4O10468.50 g·mol−1
  • Gentamicin A4
 Gentamicin A4.svg
  • Gentamicin B
  • Betamicin
 Gentamicin B.svg 36889-15-3 CID 37569 from PubChem C19H38N4O10482.53 g·mol−1
  • Gentamicin B1
 Gentamicin B1.svg 36889-16-4 CID 3034288 from PubChem C20H40N4O10496.55 g·mol−1
  • Gentamicin C1
 Gentamicin C1.svg 25876-10-2 CID 441305 from PubChem C21H43N5O7477.59 g·mol−1
  • Gentamicin C1a
 Gentamicin C1a.svg 26098-04-4 CID 72396 from PubChem C19H39N5O7449.54 g·mol−1
  • Gentamicin C2
 Gentamicin C2.svg 25876-11-3 CID 72397 from PubChem C20H41N5O7463.57 g·mol−1
  • Gentamicin C2a
 Gentamicin C2a.svg 59751-72-3C20H41N5O7463.57 g·mol−1
  • Gentamicin C2b
  • Micronomicin
 Gentamicin C2b.svg 52093-21-7 CID 107677 from PubChem C20H41N5O7463.57 g·mol−1

Kanamycins and tobramycin exhibit similar structures. Sisomicin is 4,5-dehydrogentamicin-C1a.

Components

Gentamicin is composed of a number of related gentamicin components and fractions which have varying degrees of antimicrobial potency. [38] The main components of gentamicin include members of the gentamicin C complex: gentamicin C1, gentamicin C1a, and gentamicin C2 which compose approximately 80% of gentamicin and have been found to have the highest antibacterial activity. Gentamicin A, B, X, and a few others make up the remaining 20% of gentamicin and have lower antibiotic activity than the gentamicin C complex. [34] The exact composition of a given sample or lot of gentamicin is not well defined, and the level of gentamicin C components or other components in gentamicin may differ from lot-to-lot depending on the gentamicin manufacturer or manufacturing process. Because of this lot-to-lot variability, it can be difficult to study various properties of gentamicin including pharmacokinetics and microorganism susceptibility if there is an unknown combination of chemically related but different compounds. [39]

Biosynthesis

The complete biosynthesis of gentamicin is not entirely elucidated. The genes controlling the biosynthesis of gentamicin are of particular interest due to the difficulty in obtaining the antibiotic after production. [34] [33] [35] [40] [41] Since gentamicin is collected at the cell surface and the cell surface must be perforated somehow to obtain the antibiotic. [34] [33] [35] [40] [41] Many propose the amount of gentamicin collected after production could increase if the genes are identified and re-directed to secrete the antibiotic instead of collecting gentamicin at the cell surface. [34] [33] [35] [40] [41] Literature also agrees with the gentamicin biosynthesis pathway starting with D-Glucose-6-phosphate being dephopsphorylated, transaminated, dehydrogenated and finally glycosylated with D-glucosamine to generate paromamine inside Micromonospora echinospora. [32] The addition of D-xylose leads to the first intermediate of the gentamicin C complex pathway, gentamicin A2. [32] [42] Gentamicin A2 is C-methylated and epimerized into gentamicin X2, the first branch point of this biosynthesis pathway [42]

When X2 is acted on by the cobalamin-dependent radical S-adenosyl-L-methionine enzyme GenK, the carbon position 6' is methylated to form the pharmacologically active intermediate G418 [43] [42] [32] [44] G418 then undergoes dehydrogenation and amination at the C6' position by the dehydrogenase gene, GenQ, to generate the pharmacologically active JI-20B, although another intermediate, 6'-dehydro-6'oxo-G418 (6'DOG) is proposed to be in-between this step and for which the gene GenB1 is proposed as the aminating gene. [32] [45] JI-20B is dehydroxylated and epimerized to first component of the gentamicin C complex, gentamicin C2a which then undergoes an epimerization by GenB2 and then a N-methylation by an unconfirmed gene to form the final product in this branch point, gentamicin C1. [42] [45] [32] [46]

When X2 bypasses GenK and is directly dehydrogenated and aminated by the GenQ enzyme, the other pharmacologically relevant intermediate JI-20A is formed. [32] [45] Although, there has been identification of an intermediate for this step, 6'-dehydro-6'-oxo-gentamicin X2 (6'-DOX), for which the enzyme GenB1 is purposed as the aminating enzyme. [45] JI-20A is then dehydroxylated into the first component of the gentamicin C complex for this branch, gentamicin C1a via a catalytic reaction with GenB4. [46] C1a then undergoes an N-methylation by an unconfirmed enzyme to form the final component, gentamicin C2b. [45] [42] [32] [46]

Fermentation

Gentamicin is only synthesized via submerged fermentation and inorganic sources of nutrients have been found to reduce production. [32] Traditional fermentation used yeast beef broth, [33] but there has been research into optimizing the growth medium for producing gentamicin C complex due to the C complex currently being the only pharmaceutically relevant component. [32] The main components of the growth medium are carbon sources, mainly sugars, but several studies found increased gentamicin production by adding vegetable and fish oils and decreased gentamicin production with the addition of glucose, xylose and several carboxylic acids. [32] Tryptone and various forms of yeast and yeast derivatives are traditionally used as the nitrogen source in the growth medium, but several amino acids, soybean meal, corn steep liquor, ammonium sulfate, and ammonium chloride have proven to be beneficial additives. [32] [35] Phosphate ions, metal ions (cobalt and a few others at low concentration), various vitamins (mostly B vitamins), purine and pyrimidine bases are also supplemented into the growth medium to increase gentamicin production, but the margin of increase is dependent on the species of Micromonospora and the other components in the growth medium. [32] [40] With all of these aforementioned additives, pH and aeration are key determining factors for the amount of gentamicin produced. [32] [35] A range of pH from 6.8 to 7.5 is used for gentamicin biosynthesis and the aeration is determined by independent experimentation reliant on type of growth medium and species of Micromonospora. [32] [35]

History

Gentamicin for injection Gentamicin for injection.jpg
Gentamicin for injection

Gentamicin is produced by the fermentation of Micromonospora purpurea . It was discovered in 1963 by Weinstein, Wagman et al. at Schering Corporation in Bloomfield, N.J. while working with source material (soil samples) provided by Rico Woyciesjes. [9] When M. purpurea grows in culture it is a vivid purple colour similar to the colour of the dye Gentian Violet and hence this was why Gentamicin took then name it did. Subsequently, it was purified and the structures of its three components were determined by Cooper, et al., also at the Schering Corporation. It was initially used as a topical treatment for burns at burn units in Atlanta and San Antonio and was introduced into IV usage in 1971. It remains a mainstay for use in sepsis.[ citation needed ]

It is synthesized by Micromonospora , a genus of Gram-positive bacteria widely present in the environment (water and soil). According to the American Medical Association Committee on Generic Names, antibiotics not produced by Streptomyces should not use y in the ending of the name, and to highlight their specific biological origins, gentamicin and other related antibiotics produced by this genus (verdamicin, mutamicin, sisomicin, netilmicin, and retymicin) have their spellings ending in ~micin and not in ~mycin. [47]

Research

Gentamicin is also used in molecular biology research as an antibacterial agent in tissue and cell culture, to prevent contamination of sterile cultures. Gentamicin is one of the few heat-stable antibiotics that remain active even after autoclaving, which makes it particularly useful in the preparation of some microbiological growth media.[ citation needed ]

Related Research Articles

<span class="mw-page-title-main">Ribosome</span> Synthesizes proteins in cells

Ribosomes are macromolecular machines, found within all cells, that perform biological protein synthesis. Ribosomes link amino acids together in the order specified by the codons of messenger RNA molecules to form polypeptide chains. Ribosomes consist of two major components: the small and large ribosomal subunits. Each subunit consists of one or more ribosomal RNA molecules and many ribosomal proteins. The ribosomes and associated molecules are also known as the translational apparatus.

<i>Staphylococcus aureus</i> Species of gram-positive bacterium

Staphylococcus aureus is a gram-positive spherically shaped bacterium, a member of the Bacillota, and is a usual member of the microbiota of the body, frequently found in the upper respiratory tract and on the skin. It is often positive for catalase and nitrate reduction and is a facultative anaerobe, meaning that it can grow without oxygen. Although S. aureus usually acts as a commensal of the human microbiota, it can also become an opportunistic pathogen, being a common cause of skin infections including abscesses, respiratory infections such as sinusitis, and food poisoning. Pathogenic strains often promote infections by producing virulence factors such as potent protein toxins, and the expression of a cell-surface protein that binds and inactivates antibodies. S. aureus is one of the leading pathogens for deaths associated with antimicrobial resistance and the emergence of antibiotic-resistant strains, such as methicillin-resistant S. aureus (MRSA). The bacterium is a worldwide problem in clinical medicine. Despite much research and development, no vaccine for S. aureus has been approved.

<span class="mw-page-title-main">Vancomycin</span> Antibiotic medication

Vancomycin is a glycopeptide antibiotic medication used to treat certain bacterial infections. It is administered intravenously to treat complicated skin infections, bloodstream infections, endocarditis, bone and joint infections, and meningitis caused by methicillin-resistant Staphylococcus aureus. Blood levels may be measured to determine the correct dose. Vancomycin is also taken orally to treat Clostridioides difficile infections. When taken orally, it is poorly absorbed.

<span class="mw-page-title-main">Streptomycin</span> Aminoglycoside antibiotic

Streptomycin is an antibiotic medication used to treat a number of bacterial infections, including tuberculosis, Mycobacterium avium complex, endocarditis, brucellosis, Burkholderia infection, plague, tularemia, and rat bite fever. For active tuberculosis it is often given together with isoniazid, rifampicin, and pyrazinamide. It is administered by injection into a vein or muscle.

<span class="mw-page-title-main">Neomycin</span> Type of antibiotic

Neomycin is an aminoglycoside antibiotic that displays bactericidal activity against Gram-negative aerobic bacilli and some anaerobic bacilli where resistance has not yet arisen. It is generally not effective against Gram-positive bacilli and anaerobic Gram-negative bacilli. Neomycin comes in oral and topical formulations, including creams, ointments, and eyedrops. Neomycin belongs to the aminoglycoside class of antibiotics that contain two or more amino sugars connected by glycosidic bonds.

<span class="mw-page-title-main">Aminoglycoside</span> Antibacterial drug

Aminoglycoside is a medicinal and bacteriologic category of traditional Gram-negative antibacterial medications that inhibit protein synthesis and contain as a portion of the molecule an amino-modified glycoside (sugar). The term can also refer more generally to any organic molecule that contains amino sugar substructures. Aminoglycoside antibiotics display bactericidal activity against Gram-negative aerobes and some anaerobic bacilli where resistance has not yet arisen but generally not against Gram-positive and anaerobic Gram-negative bacteria.

<span class="mw-page-title-main">Paromomycin</span> Chemical compound

Paromomycin is an antimicrobial used to treat a number of parasitic infections including amebiasis, giardiasis, leishmaniasis, and tapeworm infection. It is a first-line treatment for amebiasis or giardiasis during pregnancy. Otherwise, it is generally a second line treatment option. It is taken by mouth, applied to the skin, or by injection into a muscle.

<span class="mw-page-title-main">Kanamycin A</span> Antibiotic

Kanamycin A, often referred to simply as kanamycin, is an antibiotic used to treat severe bacterial infections and tuberculosis. It is not a first line treatment. It is used by mouth, injection into a vein, or injection into a muscle. Kanamycin is recommended for short-term use only, usually from 7 to 10 days. Since antibiotics only show activity against bacteria, it is ineffective in viral infections.

<i>Pseudomonas aeruginosa</i> Species of bacterium

Pseudomonas aeruginosa is a common encapsulated, Gram-negative, aerobic–facultatively anaerobic, rod-shaped bacterium that can cause disease in plants and animals, including humans. A species of considerable medical importance, P. aeruginosa is a multidrug resistant pathogen recognized for its ubiquity, its intrinsically advanced antibiotic resistance mechanisms, and its association with serious illnesses – hospital-acquired infections such as ventilator-associated pneumonia and various sepsis syndromes. P. aeruginosa is able to selectively inhibit various antibiotics from penetrating its outer membrane - and has high resistance to several antibiotics. According to the World Health Organization P. aeruginosa poses one of the greatest threats to humans in terms of antibiotic resistance.

<span class="mw-page-title-main">Tobramycin</span> Chemical compound

Tobramycin is an aminoglycoside antibiotic derived from Streptomyces tenebrarius that is used to treat various types of bacterial infections, particularly Gram-negative infections. It is especially effective against species of Pseudomonas.

<span class="mw-page-title-main">Amikacin</span> Antibiotic medication

Amikacin is an antibiotic medication used for a number of bacterial infections. This includes joint infections, intra-abdominal infections, meningitis, pneumonia, sepsis, and urinary tract infections. It is also used for the treatment of multidrug-resistant tuberculosis. It is used by injection into a vein using an IV or into a muscle.

<span class="mw-page-title-main">Spectinomycin</span> Antibiotic

Spectinomycin, sold under the tradename Trobicin among others, is an antibiotic useful for the treatment of gonorrhea infections. It is given by injection into a muscle.

<span class="mw-page-title-main">Netilmicin</span> Chemical compound

Netilmicin (1-N-ethylsisomicin) is a semisynthetic aminoglycoside antibiotic, and a derivative of sisomicin, produced by Micromonospora inyoensis. Aminoglycoside antibiotics have the ability to kill a wide variety of bacteria. Netilmicin is not absorbed from the gut and is therefore only given by injection or infusion. It is only used in the treatment of serious infections particularly those resistant to gentamicin.

<span class="mw-page-title-main">Sisomicin</span> Chemical compound

Sisomicin, is an aminoglycoside antibiotic, isolated from the fermentation broth of Micromonospora inositola. It is a newer broad-spectrum aminoglycoside most structurally related to gentamicin.

<span class="mw-page-title-main">Dihydrostreptomycin</span> Chemical compound

Dihydrostreptomycin is a derivative of streptomycin that has a bactericidal properties. It is a semisynthetic aminoglycoside antibiotic used in the treatment of tuberculosis.

<span class="mw-page-title-main">Protein synthesis inhibitor</span> Inhibitors of translation

A protein synthesis inhibitor is a compound that stops or slows the growth or proliferation of cells by disrupting the processes that lead directly to the generation of new proteins.

<span class="mw-page-title-main">Arbekacin</span> Antibiotic

Arbekacin (INN) is a semisynthetic aminoglycoside antibiotic which was derived from kanamycin. It is primarily used for the treatment of infections caused by multi-resistant bacteria including methicillin-resistant Staphylococcus aureus (MRSA). Arbekacin was originally synthesized from dibekacin in 1973 by Hamao Umezawa and collaborators. It has been registered and marketed in Japan since 1990 under the trade name Habekacin. Arbekacin is no longer covered by patent and generic versions of the drug are also available under such trade names as Decontasin and Blubatosine.

<span class="mw-page-title-main">Plasmid-mediated resistance</span> Antibiotic resistance caused by a plasmid

Plasmid-mediated resistance is the transfer of antibiotic resistance genes which are carried on plasmids. Plasmids possess mechanisms that ensure their independent replication as well as those that regulate their replication number and guarantee stable inheritance during cell division. By the conjugation process, they can stimulate lateral transfer between bacteria from various genera and kingdoms. Numerous plasmids contain addiction-inducing systems that are typically based on toxin-antitoxin factors and capable of killing daughter cells that don't inherit the plasmid during cell division. Plasmids often carry multiple antibiotic resistance genes, contributing to the spread of multidrug-resistance (MDR). Antibiotic resistance mediated by MDR plasmids severely limits the treatment options for the infections caused by Gram-negative bacteria, especially family Enterobacteriaceae. The global spread of MDR plasmids has been enhanced by selective pressure from antimicrobial medications used in medical facilities and when raising animals for food.

16S rRNA (guanine1405-N7)-methyltransferase (EC 2.1.1.179, methyltransferase Sgm, m7G1405 Mtase, Sgm Mtase, Sgm, sisomicin-gentamicin methyltransferase, sisomicin-gentamicin methylase, GrmA, RmtB, RmtC, ArmA) is an enzyme with systematic name S-adenosyl-L-methionine:16S rRNA (guanine1405-N7)-methyltransferase. This enzyme catalyses the following chemical reaction

<span class="mw-page-title-main">Ototoxic medication</span>

Ototoxicity is defined as the toxic effect on the functioning of the inner ear, which may lead to temporary or permanent hearing loss (cochleotoxic) and balancing problems (vestibulotoxic). Drugs or pharmaceutical agents inducing ototoxicity are regarded as ototoxic medications.

References

  1. ↑ "Gentamicin Use During Pregnancy". Drugs.com. 28 February 2019. Retrieved 11 February 2020.
  2. ↑ "FDA-sourced list of all drugs with black box warnings (Use Download Full Results and View Query links.)". nctr-crs.fda.gov. FDA . Retrieved 22 October 2023.
  3. ↑ "Active substance: gentamicin (systemic use)" (PDF). List of nationally authorised medicinal products. European Medicines Agency. 26 November 2020.
  4. ↑ "Gentamicin". PubChem. National Library of Medicine. Retrieved 20 November 2024.
  5. 1 2 3 4 5 6 7 8 9 10 11 12 13 "Gentamicin sulfate". The American Society of Health-System Pharmacists. Archived from the original on 16 August 2015. Retrieved 15 August 2015.
  6. ↑ Bartlett J (2013). Clinical Ocular Pharmacology (s ed.). Elsevier. p. 214. ISBN   9781483193915. Archived from the original on 22 December 2015.
  7. ↑ Moulds R, Jeyasingham M (October 2010). "Gentamicin: a great way to start". Australian Prescriber. 33 (5): 134–135. doi: 10.18773/austprescr.2010.062 .
  8. ↑ "Gentamicin use while breastfeeding". Archived from the original on 6 September 2015. Retrieved 15 August 2015.
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