毒理性
改变的膜完整性和炎症在心血管损伤中扮演关键角色。作者们研究了外源性给予alpha-山竹素对β-肾上腺素能儿茶酚胺诱导的心血管毒性的有益效果,特别关注了膜ATP酶、溶酶体水解酶以及炎症介质肿瘤坏死因子-α(TNF-α)和环氧合酶-2(COX-2)在白化大鼠中的表达。用异丙肾上腺素(150 mg/kg体重,ip)诱导大鼠2天,显著增加了血清和心脏溶酶体水解酶(β-D-葡萄糖苷酶、β-D-半乳糖苷酶、β-D-N-乙酰葡萄糖苷酶、酸性磷酸酶和组织蛋白酶-D)的活性。心脏中的钠、钙水平显著增加,而钾水平降低,同时伴随着膜结合磷酸酶(Na(+)-K(+) ATP酶、Ca(2+) ATP酶和Mg(2+) ATP酶)的异常活性,在给予ISO的大鼠心脏中观察到这些变化。通过Western印迹法评估心脏TNF-α和COX-2的表达。心脏TNF-α和COX-2的表达在ISO中毒的大鼠中显著升高。预先口服给予alpha-山竹素(200mg/kg体重)8天,显著减轻了这些异常,并使水平恢复到接近正常,与ISO中毒组大鼠相比。总之,alpha-山竹素通过有效减轻ISO诱导的氧化应激和细胞损伤,保持了心肌膜完整性,并减少了异常的TNF-α和COX-2表达。细胞正常化的恢复证明了alpha-山竹素的细胞保护作用。
Altered membrane integrity and inflammation play a key role in cardiovascular damage. /The authors/ investigated the salubrious effect of exogenously administered alpha-mangostin against beta-adrenergic cathecolamine-induced cardiovascular toxicity with special reference to membrane ATPases, lysosomal hydrolases and inflammatory mediators TNF-alpha and Cyclooxygenase-2 (COX-2) expressions in albino rats. Induction of rats with isoproterenol (150 mg/kg body wt, ip) for 2 days resulted in a significant increase in the activities of serum and cardiac lysosomal hydrolases (beta-d-glucuronidase, beta-d-galactosidase, beta-d-N-acetylglucosaminidase, acid phosphatase and cathepsin-D). A significant increase in cardiac levels of sodium, calcium with a decrease in the level of potassium paralleled by abnormal activities of membrane-bound phosphatases (Na(+)-K(+) ATPase, Ca(2+) ATPase and Mg(2+) ATPase) were observed in the heart of ISO-administered rats. Cardiac TNF-alpha and COX-2 expressions were assessed by Western blotting. Cardiac TNF-alpha and COX-2 expressions were significantly elevated in ISO-intoxicated rats. Pre-co-treatment with alpha-mangostin (200mg/kg body wt.) orally for 8 days significantly attenuated these abnormalities and restored the levels to near normalcy when compared to ISO intoxicated group of rats. In conclusion, alpha-mangostin preserves the myocardial membrane integrity and extenuates anomalous TNF-alpha and COX-2 expressions by mitigating ISO-induced oxidative stress and cellular damage effectively. Restoration of cellular normalcy accredits the cytoprotective role of alpha-mangostin.
来源:Hazardous Substances Data Bank (HSDB)