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Minimal inhibitory concentration of dapsone for Mycobacterium leprae in rats
Abstract:
To define the minimal inhibitory concentration (MIC) of dapsone (DDS) for Mycobacterium leprae in rats, we determined the relationship between dietary and plasma levels of DDS in uninfected male and female Lewis rats. This knowledge was applied to the design of experiments using rats inoculated in the footpads with M. leprae. The MIC for DDS in male and female rats, respectively, was 1.5 to 4.0 ng and 1.8 to 3.0 ng of DDS/ml of plasma, even though the sexes exhibited markedly different concentrations of DDS when receiving the same dietary level of DDS. These values for the MIC of DDS for M. leprae in rats are nearly identical to the previously determined MIC of DDS for M. leprae in mice.
Insights
This study determined the minimal inhibitory concentration (MIC) of dapsone (DDS) for Mycobacterium leprae in rats. The DDS MIC in rats is similar to that in mice, providing crucial data for leprosy research.
Area of Science:
- Pharmacology and Microbiology
- Infectious Diseases and Tropical Medicine
Background:
- Dapsone (DDS) is a key drug for treating leprosy.
- Understanding DDS minimal inhibitory concentration (MIC) is vital for effective treatment strategies against Mycobacterium leprae.
- Previous studies established DDS MIC in mice, but data in rats were lacking.
Purpose of the Study:
- To define the minimal inhibitory concentration (MIC) of dapsone (DDS) for Mycobacterium leprae in a rat model.
- To establish the relationship between dietary and plasma DDS levels in rats.
- To compare DDS MIC values in rats with those previously determined in mice.
Main Methods:
- Determined the relationship between dietary and plasma DDS levels in uninfected male and female Lewis rats.
- Utilized this pharmacokinetic data to design experiments with rats inoculated with Mycobacterium leprae in the footpads.
- Measured the MIC of DDS for M. leprae in plasma from infected rats.
Main Results:
- Established sex-specific DDS plasma concentrations at equivalent dietary intake levels in rats.
- Determined the MIC for DDS against M. leprae in male rats ranged from 1.5 to 4.0 ng/ml plasma.
- Determined the MIC for DDS against M. leprae in female rats ranged from 1.8 to 3.0 ng/ml plasma.
- Observed that DDS MIC values in rats were nearly identical to those previously found in mice.
Conclusions:
- The minimal inhibitory concentration (MIC) of dapsone (DDS) for Mycobacterium leprae in rats was successfully defined.
- Rat models are suitable for studying DDS efficacy in leprosy, with MIC values comparable to mice.
- These findings contribute valuable pharmacokinetic and pharmacodynamic data for DDS in leprosy research.