مستخلصات الشاي تاثيرها الذاتي او الاضافي على حياة خلايا السرطان : دراسة داخل وخارج الانبوب == Herbal Tea : Its Own Or Additive Effect On The Survival Of Cancer Cell Line : An In Vitro And Ex Vivo Study
Author name:
هدى غسان حميد
Supervisor name:
مروان صالح النمر | ناهي يوسف ياسين
General topic:
Medicine
Specific topic:
Medicines and Toxins
Degree:
Master
University:
Mustansiriyah University - Faculty Of Medicine - Pharmacology Department
Language:
English
University location:
Baghdad
First pages:
19T1188 - p.pdf
Abstract:
اجريت هذه الدراسة في فرع الفارماكولوجي في كلية الطب في الجامعة المستنصرية بالتعاون مع مركز ابحاث السرطان والوراثة\الجامعةالمستنصرية خلال الفترة من شهر كانون الثاني - شهراب لسنة 2014. الدراسة اقرت من قبل مجلس كلية الطب. صممت هذه الدراسة لتوضيح فعالية نبات ا | This study was conducted in the Department of Pharmacology at College of Medicine with incorporation of the Iraqi Center for Cancer and Medical Genetic Research at Al - Mustansiriya University, Baghdad, Iraq during 2014. This study was designed to elucidate the anti - cancer effect of Camellia sinensis by using four types of tea (black, green, white and oolong). Two experimental cancer models applied in this study; cancer cell lines (In vitro) and mice - bearing tumor (ex vivo). Several methodological and extracted aqueous and organic solvents were used to extract the tea. Microwave assisted extraction using distilled water as a solvent is applied in this study as the yield of bioactive substances are higher than other methods and organic solvents. The antioxidant activity was evaluated through the quantification of total flavonoids, total polyphenolic compound (bioflavanoids), total flavonols, reducing power, and proanthocyanidines. The scavenging property against reactive nitrogen species also was studied. The result showed that the different tea types contain approximately the same quantity of phenolic compounds; the only significant difference was in the proanthocyanidins level, which is a class of flavanols, found in high quantity in green tea compared with other tea extracts. Moreover, a significant scavenging property of peroxynitrite radical observed with all tea extracts. The extracts of black, green and oolong tea prevented or halted nitric oxide generation whereas the white extract tea promoted its generation, that is, a nitric oxide donor. The in vitro cytotoxic activity of Camellia sinensis in form of black, green, white and oolong tea was evaluated against four different types of cell lines. These are the AMN3 mammary cell carcinoma, Rhabdomyosarcoma, HeLa cells and Rat embryo fibroblast cells). The results showed greater effect of green and black tea over white tea and oolong tea against mammary cell carcinoma while the results of rhabdomyosarcoma cell line, which is an aggressive cancer cell, revealed a significant inhibitory effect of the growth of these cells by white and oolong tea extracts. All four types show almost equal percent of growth inhibition on HeLa cell line with the white tea been the most significant. A significant inhibitory effect of all tea extracts against the growth of rat embryo fibroblast cells indicated that the cytotoxic effect of the Camellia sinensis extended to normal cells and not specific to cancer cell. In addition, the antitumor effect of tea extracts was investigated (ex vivo) on BALB - c mice bearing - tumor. The volume, shape and color of the tumor masses were examined, in addition to measurement of the tissue malondialdehyde level as a biomarker of the lipid peroxidation, total tumor protein measurement and a histopathological study were done. The white tea showed antitumor effect by attenuating all the biomarkers of tumorogenesis. Herbal tea extracts induced DNA damage in term of separation the double strands molecule of calf thymus double stands DNA and human genomic DNA which may partly explained anti - cancer effect. We concluded that white tea extract is a promising nutrient that ameliorates the histopathological changes in mice bearing mammary tumor via generation reactive oxygen species by the evidence of activation lipid peroxidation process. Camellia sinensis plant can induce non harmful effect on DNA
