Green tea, a precious drink processes numbers of health benefit known to almost everyone in Asia and Western world. However, as yin in nature herbal medicine or food, long term injection of large amounts may obstruct the balance of yin-yang, induced "yin excessive syndrome" or "yang vacuity syndrome" including weaken immunity and painful case of GERD,... according to traditional Chinese medicine's Yin-Yang theory.
Skin cancer is medical condition characterized by irregular cell growth in the issues of skin. At the later stage, the cancerous cell may travel a distance away to invade other healthy tissues and organs.
According to statistic, approximately, 87,110 new cases of invasive melanoma are diagnosed in the U.S every years
The evaluation of green tea effect in overexposure to environmental solar ultraviolet (UV) radiation (290-400 nm) which has been found to increase risk of the development of melanoma and non-melanoma skin cancers in mice model showed that oral administration of green tea pylophenols (GTPs) in drinking water or the topical application of EGCG prevents UVB-induced skin tumor development in tested subjects.
Particularly, (-)-Epigallocatechin-3-gallate (EGCG), the major and most photoprotective polyphenolic component of green tea also exhibited a protective activity against UV in induction of skin cancer, through induction of immunoregulatory cytokine interleukin (IL) 12 in differentiation of naive T cells into Th1 cells and acted as T cell-stimulating factor in stimulate the growth and function of T cells.
Moreover, interleukin (IL) 12 also demonstrated a significant effect as an antagonist against immunosuppression induced by solar/ultraviolet (UV) radiation by restoring immune responses and also stimulating DNA repair.
Interestingly, additional study of green tea polyphenols (GTPs) in prevention of UVB irradiated (80 mJ/cm(2)) 3 times each week for 24 wk in induced skin cancer in mice divided in to group consumed water and group fed with water containing 2 g/L GTPs, showed that group treated with GTPs displayed a significant reduced UVB-induced tumor incidence by 35%, tumor multiplicity by 63%, and tumor growth by 55% in compared to non treatment group.
Group treated with GTPs+UVB also demonstrated a reduced expression of the matrix metalloproteinases (MMP)-2 and MMP-9, which are activator associated with progression from benign to advanced cancer and enhanced expression of specific endogenous tissue inhibitors of metalloproteinases (TIMPs), tissues inhibitor of MMP in skin tumors in compared to mice treated with UVB alone.
Further more, GTPs+UVB group also reduced expressions of CD31 and vascular endothelial growth factor, in activated development of new blood vessel to nourish skin tumor cells proliferation and site expansion and inhibited expression of proliferating cell nuclear antigen, a key factor in DNA replication and cell cycle regulation in skin cancer in compared to UVB group.
More importantly, mice treated with GTPs+UVB group also showed more cytotoxic CD8(+) T cells in the tumors in compared to UVB group by exhibited greater activation of caspase-3 epression in induced apoptosis of the tumor cells.
The information findings suggested a potential and therapeutic effect of green tea and its bioactive polyphenols (GTPs) in attenuated risk, progression and treatment of melanoma and non-melanoma skin cancers.
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Kyle J. Norton (Scholar, Master of Nutrients, All right reserved)
Health article writer and researcher; Over 10.000 articles and research papers have been written and published on line, including world wide health, ezine articles, article base, healthblogs, selfgrowth, best before it's news, the karate GB daily, etc.,.
Named TOP 50 MEDICAL ESSAYS FOR ARTISTS & AUTHORS TO READ by Disilgold.com Named 50 of the best health Tweeters Canada - Huffington Post
Nominated for shorty award over last 4 years
Some articles have been used as references in medical research, such as international journal Pharma and Bio science, ISSN 0975-6299.
(1) Green Tea Prevents Skin Cancer by Two Mechanisms by Navid Bouzari, Yvonne Romagosa, Robert S. Kirsner(PubMed)
(2) Green tea and skin cancer: photoimmunology, angiogenesis and DNA repair by Katiyar S1, Elmets CA, Katiyar SK.(PubMed)
(3) Orally administered green tea polyphenols prevent ultraviolet radiation-induced skin cancer in mice through activation of cytotoxic T cells and inhibition of angiogenesis in tumors by Mantena SK1, Meeran SM, Elmets CA, Katiyar SK.(PubMed)