1887

Abstract

It was found previously that human immunodeficiency virus type 1 (HIV-1)-irrelevant CD8 cytotoxic T lymphocytes (CTLs) from uninfected donors suppressed HIV-1 replication in a cell-contact-dependent manner. However, one of these CTL lines (CTL-3) also significantly suppressed HIV-1 replication through its supernatant. Here, the suppressive fraction from CTL-3 supernatant was purified and analysed by mass spectrometry. A protein band specific for the suppressive fraction was identified as arginine deiminase from , which catalyses the hydrolysis of arginine to citrulline. Addition of -arginine or the use of antibiotics against mycoplasma restored supernatant-mediated but not cell-contact-dependent suppression of HIV-1 replication by CTL-3, clearly indicating that arginine deiminase of in the supernatants suppressed HIV-1 replication, which is independent of CD8 T-cell-mediated HIV-1 suppression via cell contact. Arginine deiminase is known to be a chemotherapeutic agent against arginine-requiring tumours and these results suggest that it also has potential application in antiviral therapy.

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2006-06-01
2019-10-23
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