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Effect of morphine on Mycobacterium smegmatis infection in mice and macrophages

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Abstract

The immunomodulatory effects of opioids are known in various infections. However, little is known about the effects of opioids in tuberculosis (TB). In the present study, we report the effects of morphine in Mycobacterium smegmatis infection in mice and macrophages. Morphine exerted a dose-dependent suppression of infection in vivo: 50 and 100 mg/kg morphine exerted significant (P<0.05) suppression whereas 5 mg/kg morphine showed no effect. Analogous to the in vivo effects, incubation of M. smegmatis-infected mouse peritoneal macrophages with morphine (100 μM) showed significant reduction in intramacrophage CFU counts. However, morphine did not show any direct antimycobacterial activity in broth dilution assay upto 100 μM concentration. Further, morphine-induced intramacrophage killing of M. smegmatis was abrogated by naloxone and aminoguanidine indicating the involvement of opioid-receptor activation and nitric oxide production in protective effects of morphine. In conclusion, morphine suppressed the progression of experimental TB in both mice and macrophage models.

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Authors and Affiliations

  1. National Institute of Pharmaceutical Education and Research, Phase-X, S. A. S Nagar, 160 062, India

    Raman Preet Singh, Sarbjit Singh Jhamb & Prati Pal Singh

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  1. Raman Preet Singh
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  2. Sarbjit Singh Jhamb
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  3. Prati Pal Singh
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Correspondence to Sarbjit Singh Jhamb.

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Singh, R.P., Jhamb, S.S. & Singh, P.P. Effect of morphine on Mycobacterium smegmatis infection in mice and macrophages. Indian J Microbiol 49, 276–282 (2009). https://doi.org/10.1007/s12088-009-0045-6

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  • DOI: https://doi.org/10.1007/s12088-009-0045-6

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