In normal cells, angiogenesis is important for the cells to obtain nutrients and metabolites through the small blood vessels. Angiogenesis has been found to process a therapeutic effect for the treatment of ischemic heart disease, peripheral arterial disease, and wound healing.
Dr. Papetti M, the lead scientist at the Tufts University School of Medicine said, "Normal angiogenesis ensures that developing or healing tissues receive an adequate supply of nutrients".
In cancers, angiogenesis stimulated by the tumor cells has been associated with tumors proliferation and metastasis.
More precisely, the angiogenesis process a function of a double sword, on one hand, the process provides an ideal condition for the treatment of diseases and wound healing. On the other hand, it promotes invasive and overgrowth tumor.
Dr. Papetti M continued, "tumor cells induce the formation of new blood supply from the preexisting vasculature, and this affords tumor cells the ability to survive and propagate in a hostile environment"
Collectively, " both normal and tumor-induced neovascularization fulfill the essential role of satisfying the metabolic demands of tissue".
Based on the findings some researchers suggested, by the inhibiting the process of blood vessels formation of the tumor, cancer may be curable.
Dr. Dai X, the lead researchers in the study of "Suppression of murine B-cell lymphoma growth by trichosanthin through anti-angiogenesis" showed, "trichosanthin TCS, ( an immunosuppressive and anti-tumor protein) inhibits murine B-cell lymphoma growth by anti-angiogenesis was reported. First, TCS inhibit tumor growth and prolonged survival significantly in vivo, and TCS depressed the formation of new blood vessels around the tumor in a dose-dependent manner".
The onion is a plant in the genus Allium, belongings to the family Alliaceae, a close relation of garlic. It is often called the "king of vegetables" because of its pungent taste and found in a large number of recipes and preparations spanning almost the totality of the world's cultures.
Depending on the variety, an onion can be sharp, spicy, tangy, pungent, mild or sweet.
On finding a potent ingredient which processes anti-cancer activity researchers studied the antiangiogenic activity of quercetin isolated from onion, using ex vivo, in vivo and in vitro models.
According to the tested differentiation, quercetin at non-toxic concentrations significantly inhibited the microvessel sprouting associated with cancer cell proliferation.
Furthermore, the activity of cancer cells migration, invasion and tube formation of endothelial cells involved in the process of angiogenesis.was also significantly decreased by the administration of quercetin.
Quercetin treatment inhibited ex vivo angiogenesis observed by chicken egg chorioallantoic membrane assay (CAM) and matrigel plug assay.
Moreover, quercetin suppressed vascular endothelial growth factor (VEGF) which has been found to induce the formation of a blood vessel for the progression of the tumor.
Additionally, downstream pathways associated with the promotion of survival and growth in response to extracellular signals that induce angiogenesis were also inhibited by quercetin in HUVECs.
Quercetin at the concentration of 20 mg/kg/d significantly reduced the volume and the weight of solid tumors in a prostate xenograft mouse model by targeting angiogenesis.
Quercetin was also found to inhibited the cancer cell viability and induced apoptosis in prostate cancer cells.
In other words, quercetin inhibits tumor growth and angiogenesis by targeting the proteins and signaling pathways that initiate the growth of new blood vessels.
Taken altogether, onion processed a higher mount of quercetin may be considered a remedy for the prevention and treatment of cancer, pending to the confirmation of the larger sample size and multicenter human study.
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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 blogs, 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.
(1) Quercetin Inhibits Angiogenesis Mediated Human Prostate Tumor Growth by Targeting VEGFR- 2 Regulated AKT/mTOR/P70S6K Signaling Pathways by Poyil Pratheeshkumar, Amit Budhraja, Young-Ok Son, Xin Wang, Zhuo Zhang, Songze Ding, Lei Wang, Andrew Hitron, Jeong-Chae Lee, Mei Xu, Gang Chen, Jia Luo, and Xianglin Shi. (Plos One)
(2) Suppression of murine B-cell lymphoma growth by trichosanthin through anti-angiogenesis by Dai X1,2, Jiang P2, Ji Y3, Zhu X2, Sun X. (PubMed)
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