The investigation of the antitumor agent cisplatin on electron transport system enzymes by eukoryotic model

In order to determination of the antitumor agent cisplatin toxicity effect on electron transport chain (ETC) enzymes; succinate dehidrogenase (SDH), adenine nucleotide levels as well as catalase (CAT) and lipid peroxidation (LPO) levels of five different tissues, three of which are composed of post mitotic cells (brain, heart) and two of slowly dividing cells (liver and kidney) as well as lung tissues of Male Sprague Dawley adult rats, were investigated with respect to various days. Cisplatin levels reached to maximum in liver as zero point thirty eight ppm/gr tissue and the levels were ordered as kidney, brain, lung and heart as zero point thirty six, zero point twenty four, zero point twenty four and zero point fifteen ppm/gr tissue, respectively. The results shows that cisplatin transported all studied tissues.In the present study, the SDH activities of liver, lung, heart, brain and kidney decreased sixty six, fourty nine, fourty four, fourty seven, sixty three percentcompared to control at first day. These decreases were accompanied by ATP levels as fifty three, eighty three, sixty two, thirty, twenty four percent at first day. The results may suggest that cisplatin agent induce the inhibition of SDH enzyme activityin addition ATP levels. Nevertheless, as an antioxidant enzyme CAT activity showed different trends depending on the tissue. LPO levels increased depending on cisplatin toxicity zero point four-fold, zero point four-fold, zero point five-fold, zero point two-fold and zero point five-fold compared with control groups of liver, lung, heart, brain and kidney, at first day respectively. According to the our results, cisplatin induced toxicity in each tissue especially for first day were determined with higher LPO levels, the results can be explained by insufficiency in enzymatic and nonenzymatic antioxidant systems against to cisplatin toxicity therefore in the second last step of the thesis, we added cisplatin with capsaicin which is non-enzymatic antioxidant to determine capsaicin effect on these system. vIn general, SDH activity in cisplatin with capsaicin treated tissue increased while CAT activity and LPO levels decreased compared to only cisplatin groups. The results suggest that capsaicin have antioxidant capacity to scavenge ROS to prevent membrane damage.Keyword: Cisplatin, capsaicin, Sprague Dawley, ETC enzymes, adenine nucleotides, CAT, LPO