1. Anti-infection
  2. Bacterial
  3. Gamithromycin

Gamithromycin (Synonyms: ML-1709460)

Cat. No.: HY-108365 Purity: >98.0%
Handling Instructions

Gamithromycin is an antimicrobial agent which can inhibit the growth of MmmSC strains B237 and Tan8 with MICs of 0.00012 and 0.00006 μg/mL, respectively.

For research use only. We do not sell to patients.

Gamithromycin Chemical Structure

Gamithromycin Chemical Structure

CAS No. : 145435-72-9

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Based on 1 publication(s) in Google Scholar

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Description

Gamithromycin is an antimicrobial agent which can inhibit the growth of MmmSC strains B237 and Tan8 with MICs of 0.00012 and 0.00006 μg/mL, respectively.

IC50 & Target

MIC: 0.00012 μg/mL (MmmSC strain B237), 0.00006μg/mL (MmmSC strain Tan8)[1]

In Vitro

The MIC values in serum are significantly lower than those in artificial medium; at an initial inoculum size of 106 cfu/mL, these are 64-, 8- and 64-fold lower for gamithromycin, tylosin and tilmicosin, respectively, against MmmSC strain B237 in serum compare to artificial medium. A similar pattern emerges for Tan8. Heat-inactivation of serum results in an MIC for gamithromycin that is higher than in either non-treated serum or artificial medium[1].

In Vivo

The proportion of foals that recover without the need for a change in treatment is significantly (P<0.048) higher for foals treated with Gamithromycin (GAM) (38 of 40; 95%) or AZM-RIF (39 of 40; 98%) compare to control foals (32 of 41; 78%). The clinical scores, number of abscesses and the abscess scores after 1 and 2 weeks of treatment are significantly lower for foals treated with Gamithromycin (GAM) or AZM-RIF compare to control foals. The WBC count of foals treated with Gamithromycin (GAM) is significantly higher than that of foals treated with AZM-RIF on week 3 of treatment[2].

Molecular Weight

777.04

Formula

C₄₀H₇₆N₂O₁₂

CAS No.

145435-72-9

SMILES
Shipping

Room temperature in continental US; may vary elsewhere

Storage
Powder -20°C 3 years
  4°C 2 years
In solvent -80°C 6 months
  -20°C 1 month
Solvent & Solubility
In Vitro: 

DMSO : 160 mg/mL (205.91 mM; Need ultrasonic and warming)

Preparing
Stock Solutions
Concentration Solvent Mass 1 mg 5 mg 10 mg
1 mM 1.2869 mL 6.4347 mL 12.8694 mL
5 mM 0.2574 mL 1.2869 mL 2.5739 mL
10 mM 0.1287 mL 0.6435 mL 1.2869 mL
*Please refer to the solubility information to select the appropriate solvent.
References
Cell Assay
[1]

Minimum inhibitory concentrations (MICs) for gamithromycin, tylosin and tilmicosin against MmmSC strains B237 and Tan8 are determined using a macrodilution technique. Equal volumes of MmmSC culture in logarithmic phase are added to each antimicrobial dilution to give an inoculum size of 107 cfu/mL, i.e. the intending initial titre for subsequent time-kill assays, in a volume of 4 mL. Cultures are incubated for 24 h at 37°C. At 0 and 24 h time points, samples are removed and serially diluted 10-fold down to 10-5. Aliquots (10 μL) of each dilution are transferred to solid medium; after incubation at 37°C in a humidified atmosphere of 5% carbon dioxide in air for at least 4 days, colonies are counted from the dilution that yields between 30 and 300 colonies per plate. Counts are converted into cfu/mL and MIC is defined as the lowest concentration of antimicrobial that prevents an increase in cfu/mL over 24 h[1].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Animal Administration
[2]

Foals with ultrasonographic evidence of pulmonary abscesses are randomly assigned in 3 treatment groups: (1)gamithromycin at a dose of 6.0 mg/kg body weight is administered in the semimembranosus/semitendinosus muscles once a week (GAM; n=40); (2) azithromycin at a dose of 10 mg/kg PO once daily in combination with rifampin at a dose of 10 mg/kg PO once daily (AZM-RIF; n=40); and (3) no antimicrobial treatment (controls; n=41). All the foals in each treatment group also receive acetylcysteine at a dose of 10 mg/kg PO a day to provide the same daily manipulation of the foals in each group[2].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

References
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