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Doherty TM, Sher A. IL-12 Promotes Drug-Induced Clearance of Mycobacterium avium Infection in Mice. THE JOURNAL OF IMMUNOLOGY 1998. [DOI: 10.4049/jimmunol.160.11.5428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
The intracellular pathogen Mycobacterium avium is a major cause of opportunistic infection in AIDS patients and is difficult to manage using conventional chemotherapeutic approaches. In the current study, we describe a strategy for the treatment of M. avium in T cell-deficient hosts based on the simultaneous administration of antibiotics and the immunomodulatory cytokine IL-12. In contrast to SCID mice, which were partially resistant, animals lacking a functional IL-12 p40 gene were found to be highly susceptible to M. avium infection, suggesting that the cytokine can control bacterial growth even in immunodeficient mice. Indeed, rIL-12 that was injected into infected SCID mice in high doses caused small but significant reductions in splenic pathogen loads. Moreover, a lower dose of IL-12, when combined with the antimycobacterial drugs clarithromycin or rifabutin, induced a decrease in bacterial numbers that was significantly greater than that resulting from the administration of the cytokine or drug alone. A similar synergistic effect of IL-12 and antibiotics was seen when immunocompetent mice were treated with the same regimen. The activity of IL-12 in these experiments was shown to be dependent upon the induction of endogenous IFN-γ. Nevertheless, IFN-γ itself, even when given at a higher dose than IL-12, failed to significantly enhance antibiotic clearance of bacteria. Together these findings suggest that IL-12 may be a particularly potent adjunct for chemotherapy of M. avium infection in immunocompromised individuals and may result in more effective control of the pathogen without the need for increased drug dosage.
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Affiliation(s)
- T. Mark Doherty
- Immunobiology Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Alan Sher
- Immunobiology Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
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Kim TS, Cohen EP. Macrophage-activating factors produced by murine leukemia x fibroblast hybrid cells stimulates resistance toMycobacterium avium complex. Arch Pharm Res 1997; 20:225-33. [DOI: 10.1007/bf02976149] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/1997] [Indexed: 11/29/2022]
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Chandra RK. Nutrition, immunity and infection: from basic knowledge of dietary manipulation of immune responses to practical application of ameliorating suffering and improving survival. Proc Natl Acad Sci U S A 1996; 93:14304-7. [PMID: 8962043 PMCID: PMC34479 DOI: 10.1073/pnas.93.25.14304] [Citation(s) in RCA: 135] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Affiliation(s)
- R K Chandra
- Memorial University of Newfoundland, Janeway Child Health Centre, St. John's, Newfoundland, Canada
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