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Friday, March 15, 2019

Green Tea and Its' Polyphenols (GTPs) That Protect Our Bodily Skin Against the Onset of Cancer, Scientists Say

Green tea may have a strong and positive effect in reduced risk and treatment of skin cancer, some scientists suggested.

Skin cancer is a 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 year.

The exact causes of skin cancer are unknown. Researchers believed that there are a set of factors that can have a substantial effect to initiate the onset of skin cancer.

Truly, according to the studies, people who have fair skin, regardless of skin color, a history of sunburns, excessive sun exposure, including occupations which are required to work outside during Summar months, moles, family history of skin cancer. and previous and personal history of skin cancer is at the increased risk of skin cancer or recurrence of skin cancer.

The American Institute for Cancer Research, certain lifestyle habits can increase the risk of skin cancer, such as drinking too much coffee, excessive alcohol drinking and long-term intake of certain medications in suppressing the immune system.

Green tea a precious drink processes numbers of health benefit known to almost everyone in Asia and the Western world.

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 polyphenols (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.

Further analysis also indicated that green tea (-)-Epigallocatechin-3-gallate (EGCG) also inhibited UV in the induction of skin tumors; the angiogenetic effect in the stimulated production of new blood vessels to
provide nutrients and oxygen for cancer cells proliferation and survivals and initiated cytotoxic T lymphocyte cells in induced cancer and infectious and damage cells apoptosis.


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 significantly 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.

Furthermore, GTPs+UVB group also reduced expressions of CD31 and vascular endothelial growth factor, inactivated 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 expression 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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Author Biography
Kyle J. Norton (Scholar, Master of Nutrition, All right reserved)

Health article writer and researcher; Over 10.000 articles and research papers have been written and published online, including worldwide health, ezine articles, article base, health blog, self-growth, 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 Bioscience, ISSN 0975-6299.

Sources
(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)

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