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Published in PLoS pathogens - 10 Aug 2016

Ploquin MJ, Madec Y, Casrouge A, Huot N, Passaes C, Lécuroux C, Essat A, Boufassa F, Jacquelin B, Jochems SP, Petitjean G, Angin M, Gärtner K, Garcia-Tellez T, Noël N, Booiman T, Boeser-Nunnink BD, Roques P, Saez-Cirion A, Vaslin B, Dereudre-Bosquet N, Barré-Sinoussi F, Ghislain M, Rouzioux C, Lambotte O, Albert ML, Goujard C, Kootstra N, Meyer L, Müller-Trutwin MC

Link to Pubmed [PMID] – 27509048

PLoS Pathog. 2016 Aug;12(8):e1005774

Elevated blood CXCL10/IP-10 levels during primary HIV-1 infection (PHI) were described as an independent marker of rapid disease onset, more robust than peak viremia or CD4 cell nadir. IP-10 enhances the recruitment of CXCR3+ cells, which include major HIV-target cells, raising the question if it promotes the establishment of viral reservoirs. We analyzed data from four cohorts of HIV+ patients, allowing us to study IP-10 levels before infection (Amsterdam cohort), as well as during controlled and uncontrolled viremia (ANRS cohorts). We also addressed IP-10 expression levels with regards to lymphoid tissues (LT) and blood viral reservoirs in patients and non-human primates. Pre-existing elevated IP-10 levels but not sCD63 associated with rapid CD4 T-cell loss upon HIV-1 infection. During PHI, IP-10 levels and to a lesser level IL-18 correlated with cell-associated HIV DNA, while 26 other inflammatory soluble markers did not. IP-10 levels tended to differ between HIV controllers with detectable and undetectable viremia. IP-10 was increased in SIV-exposed aviremic macaques with detectable SIV DNA in tissues. IP-10 mRNA was produced at higher levels in the small intestine than in colon or rectum. Jejunal IP-10+ cells corresponded to numerous small and round CD68neg cells as well as to macrophages. Blood IP-10 response negatively correlated with RORC (Th17 marker) gene expression in the small intestine. CXCR3 expression was higher on memory CD4+ T cells than any other immune cells. CD4 T cells from chronically infected animals expressed extremely high levels of intra-cellular CXCR3 suggesting internalization after ligand recognition. Elevated systemic IP-10 levels before infection associated with rapid disease progression. Systemic IP-10 during PHI correlated with HIV DNA. IP-10 production was regionalized in the intestine during early SIV infection and CD68+ and CD68neg haematopoietic cells in the small intestine appeared to be the major source of IP-10.

https://www.ncbi.nlm.nih.gov/pubmed/27509048