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Arginase-induced L-arginine deprivation is emerging as a key mechanism for the downregulation of immune responses. We hypothesised that arginase activity increases with disease severity in HIV-seropositive patients. Our results show that peripheral blood mononuclear cells (PBMCs) from 23 HIV-seropositive patients with low CD4(+) T cell counts (≤350 cells/μl) expressed significantly more arginase compared with 21 patients with high CD4(+) T cell counts. Furthermore, we found a significant association between the two principal prognostic markers used to monitor HIV disease (CD4(+) T cell count and plasma viral load) and PBMC arginase activity in antiretroviral therapy naïve patients but not in patients undergoing therapy.

Antiretroviral therapy abrogates association between arginase activity and HIV disease severity