These authors contributed equally to this work as first authors.
CD163 favors Mycobacterium leprae survival and persistence by promoting anti-inflammatory pathways in lepromatous macrophages
Version of Record online: 14 SEP 2012
© 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
European Journal of Immunology
Volume 42, Issue 11, pages 2925–2936, November 2012
How to Cite
Moura, D. F., de Mattos, K. A., Amadeu, T. P., Andrade, P. R., Sales, J. S., Schmitz, V., Nery, J. A. C., Pinheiro, R. O. and Sarno, E. N. (2012), CD163 favors Mycobacterium leprae survival and persistence by promoting anti-inflammatory pathways in lepromatous macrophages. Eur. J. Immunol., 42: 2925–2936. doi: 10.1002/eji.201142198
- Issue online: 29 OCT 2012
- Version of Record online: 14 SEP 2012
- Accepted manuscript online: 31 JUL 2012 07:32AM EST
- Manuscript Accepted: 26 JUL 2012
- Manuscript Revised: 3 JUL 2012
- Manuscript Received: 25 OCT 2011
Lepromatous macrophages possess a regulatory phenotype that contributes to the immunosuppression observed in leprosy. CD163, a scavenger receptor that recognizes hemoglobin–haptoglobin complexes, is expressed at higher levels in lepromatous cells, although its functional role in leprosy is not yet established. We herein demonstrate that human lepromatous lesions are microenvironments rich in IDO+CD163+. Cells isolated from these lesions were CD68+IDO+CD163+ while higher levels of sCD163 in lepromatous sera positively correlated with IL-10 levels and IDO activity. Different Myco-bacterium leprae (ML) concentrations in healthy monocytes likewise revealed a positive correlation between increased concentrations of the mycobacteria and IDO, CD209, and CD163 expression. The regulatory phenotype in ML-stimulated monocytes was accompanied by increased TNF, IL-10, and TGF-β levels whereas IL-10 blockade reduced ML-induced CD163 expression. The CD163 blockade reduced ML uptake in human monocytes. ML uptake was higher in HEK293 cells transfected with the cDNA for CD163 than in untransfected cells. Simultaneously, increased CD163 expression in lepromatous cells seemed to be dependent on ML uptake, and contributed to augmented iron storage in lepromatous macrophages. Altogether, these results suggest that ML-induced CD163 expression modulates the host cell phenotype to create a favorable environment for myco-bacterial entry and survival.