Effect of Chlorella intake on Cadmium metabolism in rats

This study was performed to investigate the effect of chlorella on cadmium (Cd) toxicity in Cd- administered rats. Sixty male Sprague-Dawley rats (14 week-old) were blocked into 6 groups. Cadmium chloride was given at levels of 0 or 325 mg (Cd: 0, 160 ppm), and chlorella powder at levels of 0, 3 and 5%. Cadmium was accumulated in blood and tissues (liver, kidney and small intestine) in the Cd-exposed groups, while the accumulation of Cd was decreased in the Cd-exposed chlorella groups. Fecal and urinary Cd excretions were remarkably increased in Cd-exposed chlorella groups. Thus, cadmium retention ratio and absorption rate were decreased in the Cd exposed chlorella groups. Urinary and serum creatinine, and creatinine clearance were not changed in experimental animals. In addition, metallothionein (MT) synthesis in tissues was increased by Cd administration. The Cd-exposed chlorella groups indicated lower MT concentration compared to the Cd-exposed groups. Moreover, glomerular filtration rate (GFR) was not changed by dietary chlorella and Cd administration. According to the results above, this study could suggest that Cd toxicity can be alleviated by increasing Cd excretion through feces. Therefore, when exposed to Cd, chlorella is an appropriate source which counteracts heavy metal poisoning, to decrease the damage of tissues by decreasing cadmium absorption.

Biological Index for Cadmium Exposure: Assay of Metallothionein by Competitive ELISA / 대한산업의학회지

Metallothionein (MT) is a cadmium binding protein that played major' roles in protective mechanism for cadmium toxicity. In the present study, competitive ELISA was established to assay the MT expression utilizing monospecific antibody which was generated against MT-L A total of 10 Sprague-Dawley rats was injected with CdCl2 for two weeks to induce MT. The cytosolic fraction of rat liver was obtained by differential centrifugation. Two major MT isozymes (MT-I & MT-II) at ca. 10 kDa were purified by Sephadex G-75 gel filtration followed by DEAE-Trisacryl-M anion exchange column chromatogra-phy, respectively. Two rabbits were immunized 4 times consecutively with the conjugate of purified MT-L The sera were collected by heart puncture. When immunoblot was carried out, the immunized rabbit sera (anti-MT-I) exhibited specific immunoreactive band at MT-I while showed any cross reactions neither with MT-II nor with other cytosolic proteins.. By chequerboard titration using the monospecific antibody, the competitive ELISA was established. The dose-dependent relationship was observed between anti-MT-I antibody and the amount of MT in biological samples (r(2)=O.9980). These results suggested strongly that competitive ELISA is a simple, rapid and reproducible method for screening cadmium exposure.

Biological Index for Cadmium Exposure: Assay of Metallothionein by Competitive ELISA / 대한산업의학회지

Metallothionein (MT) is a cadmium binding protein that played major' roles in protective mechanism for cadmium toxicity. In the present study, competitive ELISA was established to assay the MT expression utilizing monospecific antibody which was generated against MT-L A total of 10 Sprague-Dawley rats was injected with CdCl2 for two weeks to induce MT. The cytosolic fraction of rat liver was obtained by differential centrifugation. Two major MT isozymes (MT-I & MT-II) at ca. 10 kDa were purified by Sephadex G-75 gel filtration followed by DEAE-Trisacryl-M anion exchange column chromatogra-phy, respectively. Two rabbits were immunized 4 times consecutively with the conjugate of purified MT-L The sera were collected by heart puncture. When immunoblot was carried out, the immunized rabbit sera (anti-MT-I) exhibited specific immunoreactive band at MT-I while showed any cross reactions neither with MT-II nor with other cytosolic proteins.. By chequerboard titration using the monospecific antibody, the competitive ELISA was established. The dose-dependent relationship was observed between anti-MT-I antibody and the amount of MT in biological samples (r(2)=O.9980). These results suggested strongly that competitive ELISA is a simple, rapid and reproducible method for screening cadmium exposure.

Ginsenoside Rg1 protect against Cadmium-induced tesicular damage in rat / 重庆医科大学学报

Objective:To investigate the protective effect and the possible mechanism of Rg1 on Cadmium-induced tesicular damage in rat.Methods:30 wistar rats were divided into 3 groups:the control group,the Cd group and the Cd+Rg1 group.The Cd group rats injected intraperitoneally with 0.5 mg/(kg?d) cadmium for 14 days.The rats in the Cd+Rg1 group were pretreated with 75mg/(kg?d) Rg1 by intragastric administration before injected intraperitoneally with 0.5 mg/(kg?d) cadmium.All animals were killed after 14 days,the sperm count,the movable sperm percentage and the abnormal sperm rate in epididymis were analyzed.The content of MT in testis were detected and the apoptosis of testis genital cells were assessed by TdT-mediated dUTP-biotin nick end labeling(TUNEL)technique.Results:14 days after exposed to Cd caused a significant decrease in the sperm count and the movable sperm percentage.On the other hand,the abnormal sperm rate,the content of MT and the apoptosis percent of genital cells in testis were increased significantly.In the Cd+Rg1 group,the sperm count,the movable sperm percentage and the content of MT were higher than that of Cd group,while the abnormal sperm rate and the apoptosis percent of genital cells in testis were significantly lower than that of Cd group.Conclusion:Rg1 have protective effect on on tesicular damage induced by Cd possibly through upregulating the expression of MT in testis.