Wanna Tanglakanavanich. Effects of organotin compounds on chromosomal damage and sperm abmormality in rodents. Master's Degree(Toxicology). Mahidol University. Mahidol University Library and Knowledge Center. : Mahidol University, 1996.
Effects of organotin compounds on chromosomal damage and sperm abmormality in rodents
Abstract:
Triphenyltin hydroxide (TPTH) and dibutyltin dichloride (DBTC) are organotin compounds which are widely used in both agriculture and industry. They were subjected to investigate for their mutagenic activities in vivo by using micronucleus test and sperm morphology test. The micronucleus test is in vivo test for detection chromosomal damage. In this study mice were administered orally with either TPTH or DBTC. The doses of TPTH were 35, 70 or 140 mg/kg body weight while the doses of DBTC were 10, 25 or 50 mg/kg body weight. After 48 hr of treatment, bone marrow samples were obtained from both femurs. The cells were then scored for frequencies of micronucleated polychromatic erythrocytes (MNPCEs) and were counted for the ratio of polychromatic erythrocyte (PCE) to normochromic erythrocyte (NCE). It was found that there was not significantly increased in the frequencies of MNPCEs in those animals which received TPTH or DBTC at all doses treatment. However, PCE: NCE ratios were significantly decreased at 70 and 140 mg/kg body weight of TPTH or at 25 and 50 mg/kg body weight of DBTC when comparing with the control group. In addition, the time-course effect of these two compounds were also study. The mice were administered orally with 140 mg/kg body weight TPTH or 50 mg/kg body weight DBTC and then bone marrow contents were sampled at 24, 48 or 72 hr after treatment. The results showed that the frequencies of MNPCEs induced by both compounds were not significantly increased at all post-treatment sampling times. However, the ratios of PCE: NCE at 48 and 72 hr after TPTH treatment and at 24 and 48 hr of DBTC treatment were significantly decreased. The PCE: NCE ratio would increase at 72 hr by comparison to sampling at 48 hr due to erythropoitic cell recovery. Moreover, the mutagenic activities of TPTH and DBTC were examined in mice by using the sperm morphology test. Mice were administered orally for 5 consecutive days with TPTH at doses of 10, 20 or 40 mg/kg body weight or DBTC at doses of 5, 15 or 30 mg/kg body weight. Then at 35 days after the first treatment, sperms were obtained from both cauda epididymises and scored for the frequencies of morphological abnormalities and counted for the number of sperms per gram of cauda epididymises by using hemocytometer. It was found that there were not significantly increased in the sperm morphological abnormalities and sperm number at all doses of the both compounds treatment when comparing with the control groups. The acute toxic effects of TPTH at doses of 35, 70 or 140 mg/kg body weight or DBTC at doses of 10, 25 or 50 mg/kg body weight on the blood chemistry parameters were also investigated in mice after 48 hr oral treatment. The results showed that TPTH at all dose levels had no effect on all parameters except inorganic phosphorus. The plasma level of inorganic phosphorus was significantly decreased at the dose of 35 mg/kg body weight of TPTH. It was likely that TPTH was capable of inducing the abnormal reabsorption of phosphorus at the proximal convoluted tubules of kidney. Mice treated with DBTC at the dose level of 25 mg/kg body weight showed apparently increased in the level of GOT, GPT, ALP and cholesterol while glucose levels of the treated groups were significantly lower than the control group (p < 0.05). These increasing levels were higher when the dose of DBTC increased. In the dose of 50 mg/kg body weight of DBTC, the levels of T-Bil, D-Bil were also significantly increased (p < 0.01). It showed that DBTC was capable of inducing the hepatotoxicity and bile duct lesion in the dose-dependent manner.