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  • Title: Inhibition of rat brain nitric oxide synthase activity by cyclosporin-A.
    Author: Rao MR, Kanji VK, Salahudeen MK, Wang C, Sekhar V.
    Journal: Indian J Exp Biol; 1996 Dec; 34(12):1265-7. PubMed ID: 9246923.
    Abstract:
    Cyclosporin-A, a potent immunosuppressive agent is known to induce cellular toxic side effects by way of altering calcium homeostasis, including calcium/calmodulin mediated events. We studied the in vitro and in vivo effects of cyclosporin-A on rat brain nitric oxide synthase activity (the enzyme that mediates the conversion of L-arginine to citrulline and NO). CsA in concentrations of 22-4400 nM inhibited rat brain NOS activity in vitro and in 10 or 25 mg/kg wt/4 weeks of CsA treated rat brains in vivo. We report here that CsA by way of interfering with rat brain Ca2+/CaM mediated events may inhibit its NOS activity which ultimately may result in neurotoxicity.
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