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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Insight into the role of DL-alpha-lipoic acid against cyclophosphamide induced alterations in calcium sensitivity of cardiac myofilaments.

Cyclophosphamide (CP), a potent antitumor drug, is known to cause severe cardiotoxicity. The present study is aimed at evaluating the role of DL-alpha-Lipoic acid (LA) on the calcium responsiveness of cardiac myofilaments isolated from CP treated rats. Adult male Wistar rats were divided into four treatment groups. Two groups received single intraperitoneal injection of CP (200 mg/kg b.wt.) to induce cardiotoxicity, one of these groups received LA treatment (25 mg/kg b.wt. for 10 days). A vehicle treated control group and a LA drug control were also included. Cardiotoxicity was evident from increased levels of cardiac Troponin I in serum of CP treated rats. The pCa-actomyosin ATPase relationship of myofilaments demonstrated a rightward shift indicating diminished responsiveness in CP treated rats. The hill coefficient was reduced and the myofibrillar myosin Ca(2+)-ATPase and K(+)-(EDTA) activities were also significantly (P < 0.05) reduced. Ultrastuctural observations were also in agreement with the above abnormal changes, wherein loss of myofilaments occurred. LA effectively normalized these abnormalities and restored the cardiac function in CP administered rats.[1]


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