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Mycobacterium avium complex (MAC) infection is the most common disseminated bacterial infection in untreated patients with acquired immunodeficiency syndrome (AIDS). We investigated the potential role of monocyte chemotactic protein-1 (MCP-1) in the pathogenesis of disseminated MAC, using the simian immunodeficiency virus (SIV)/macaque model of AIDS. Macaques were inoculated with SIV, followed by challenge with a pathogenic AIDS isolate of M. avium 14 days later. After challenge with M. avium, marked increases in serum MCP-1 levels were detected in SIV-infected macaques, a finding that was duplicated in coinoculated bronchoalveolar macrophages. MCP-1 levels were significantly higher in SIV-infected macaques than in non-SIV-infected controls (327.1 vs. 151.5 pg/mL, respectively; P=.04), suggesting that up-regulation of MCP-1 contributes to the development of progressive mycobacterial disease. Similarly, morphometric analysis revealed increased expression of MCP-1 in hepatic microgranulomas from SIV-infected macaques. We conclude that the pronounced increases in MCP-1 levels demonstrated in tissue and serum samples after M. avium inoculation may play a role in the development of disseminated mycobacterial disease.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Alterations in Expression of Monocyte Chemotactic Protein–1 in the Simian Immunodeficiency Virus Model of Disseminated<i>Mycobacterium</i><i>avium</i>Complex

Alterations in Expression of Monocyte Chemotactic Protein–1 in the Simian Immunodeficiency Virus Model of DisseminatedMycobacteriumaviumComplex