鼠尾藻醇提取物的生理活性和生物化学研究

本研究比较了鼠尾藻醇提取物(ST_1,ST_2,ST_3)体外抑制人食管癌细胞株(Ec-(109))的生理活性。结果表明,浓度为100mg/mL的不同提取物作用48h后均出现明显抑制,细胞大部分脱落,抑制率在75％—95％之问;当浓度为50mg/mL,抑制率保持在30％以上;25mg/mL以下浓度仍表现出显著效果。以5％浓度,445mg/kg ip连续10d对小鼠肉瘤S_(180)均有效果。 对提取物的生化研究发现,ST_3对荷瘤鼠血浆巯基(SH)含量有明显影响。ST_1和ST_3对荷瘤鼠血浆A/G比值有显著影响,结果提高了血浆内球蛋白浓度。ST_1对荷瘤鼠压积红细胞超氧化物歧化酶(SOD)有一定的影响,试验组SOD活性较对照低30％。ST_2可刺激人粒细胞超氧阴离子自由基(O_2)的释放,表明ST_2对粒细胞有激活作用。     

羊栖菜苗种技术初步研究

研究了羊栖菜的假根培苗和幼孢子体育苗等两种育苗技术并获了成功。提出：羊栖菜以假根营养繁殖为主，有性生殖为辅共同维系种群繁衍茂”的推论。     

海藻、芫花反甘草的研究进展

中药配伍中相反指两种药物合用产生或增强毒性或使疗效降低,而“十八反”是重要的配伍禁忌,也是现代药性理论争议最多的问题,且至今尚未形成较统一的判断标准和结论.主要介绍了“十八反”中有关海藻、芫花反甘草的毒性和机制研究,探讨了影响“十八反”的因素,并在此基础上提出根据不同药物的特点确定其特定部位的安全药理实验内容的观点.     

羊栖菜多糖诱导肿瘤细胞凋亡的实验研究

目的研究羊栖菜多糖(SFPS)对人白血病HL-60细胞系增殖抑制和凋亡诱导作用。方法MTT法检测SFPS对HL-60细胞增殖的抑制作用;扫描电镜、透射电镜、琼脂糖凝胶电泳和流式细胞仪检测细胞凋亡。结果SFPS对HL-60细胞具有显著生长抑制作用,并呈量效和时效关系;药物浓度为300 mg/L和500 mg/L作用HL-60细胞后,观察到典型的细胞凋亡形态学特征;DNA凝胶电泳呈现梯状条带;DNA直方图出现亚G1峰。在一定浓度范围内,SFPS诱导细胞凋亡的作用呈现浓度和时间依赖性,同时G2/M期细胞比例增多。结论SFPS抗肿瘤作用与诱导细胞凋亡和G2/M期细胞阻滞有关。     

Pigmentation and Dermal Conservative Effects of the Astonishing Algae Sargassum Polycystum and Padina Tenuis on Guinea Pigs,Human Epidermal Melanocytes (HEM) and Chang Cells

Background

The preference for a fairer skin-tone has become a common trend among both men and women around the world. In this study, seaweeds Sargassum polycystum and Padina tenuis were investigated for their in vitro and in vivo potentials in working as skin whitening agents. Seaweed has been used as a revolutionary skin repairing agent in both traditional and modern preparations. The high antioxidant content is one of the prime reasons for its potent action. It has been employed in traditional Chinese and Japanese medicine. For centuries, most medical practitioners in the Asian cultures have known seaweed as an organic source of vitamins, minerals, fatty acids like omega-3 and omega-6 and antioxidants. The present objective of the study was to evaluate the potent dermal protective effect of the two seaweeds Sargassum polycystum and Padina tenuis on human cell lines and guinea pigs.

Material and Methods

Seaweeds were extracted with ethanol and further fractionated with hexane, ethyl acetate and water. The extracts were tested for mushroom tyrosinase inhibitory activity, cytotoxicity in human epidermal melanocyte (HEM), and Chang cells. Extracts with potent melanocytotoxicity were formulated into cosmetic cream and tested on guinea pigs in dermal irritation tests and de-pigmentation assessments.

Results

Both Sargassum polycystum and Padina tenuis seaweeds showed significant inhibitory effect on mushroom tyrosinase in the concentration tested. SPEt showed most potent cytotoxicity on HEM (IC₅₀ of 36µg/ml), followed by SPHF (65µg/ml), and PTHF (78.5µg/ml). SPHF and SPEt reduced melanin content in skin of guinea pigs when assessed histologically.

Conclusion

SPEt, SPHF and PTHF were able to inhibit HEM proliferation in vitro, with SPHF being most potent and did not cause any dermal irritation in guinea pigs. The results obtained indicate that SPHF is a promising pharmacological or cosmetic agent.