Cystamine restores GSTA3 levels in Vanin-1 null mice

Free Radical Biology & Medicine
Luana Di LeandroGiuseppina Pitari

Abstract

Free cysteamine levels in mouse tissues have been strictly correlated to the presence of membrane-bound pantetheinase activity encoded by Vanin-1. Vanin-1 is involved in many biological processes in mouse, from thymus homing to sexual development. Vanin-1 -/- mice are fertile and grow and develop normally; they better control inflammation and most of the knockout effects were rescued by cystamine treatment. Gene structure analysis showed the presence of an oxidative stimuli-responsive ARE-like sequence in the promoter. In this paper we investigate antioxidant-detoxifying enzymatic activities at the tissue level, comparing Vanin-1 -/- and wild-type mice. In Vanin-1 null animals we pointed out a decrease in the Se-independent glutathione peroxidase activity. The decrease in enzymatic activity appeared to be correlated to an impairment of GST isoenzyme levels. In particular a significant drop in GSTA3 together with a minor decrement in GSTM1 and an increase in GSTP1 levels was detected in Vanin-1 -/- livers. Cystamine administration to Vanin-1 -/- mice restored specifically GSTA3 levels and the corresponding enzymatic activity without influencing protein expression. A possible role of cystamine on protein stability/folding can be ...Continue Reading

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