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Black tea-induced decrease in IL-10 and TGF-beta of tumor cells promotes Th1/Tc1 response in tumor bearer
Debaprasad Mandal1, Sankar Bhattacharyya, Lakshmishri Lahiry
1Bose Institute, P-1/12 CIT Scheme VII M, Kolkata, 700054, India.
Nutrition and Cancer
|July 21, 2007
Summary
Black tea extract reduced immunosuppressive cytokines in tumor cells, preventing immune suppression. This promotes a beneficial Th1/Tc1 immune response, aiding immunosurveillance against cancer.
Area of Science:
- Immunology
- Cancer Biology
- Natural Products
Background:
- Tumor cells can impair host immune function through various escape mechanisms.
- Immunosuppression by tumor cells is often mediated by secreted cytokines.
- Ehrlich's ascites carcinoma (EAC) in mice serves as a model for studying tumor-induced immune dysfunction.
Purpose of the Study:
- To investigate the effect of black tea on tumor-induced immunosuppression in EAC-bearing mice.
- To determine if black tea can modulate cytokine profiles related to immune escape.
- To assess the impact of black tea on T helper cell populations and cytotoxic T cell activity.
Main Methods:
- EAC-bearing mice were treated with black tea at an antitumor dose (2.5%).
- Levels of immunosuppressive cytokines, transforming growth factor beta (TGF-beta) and interleukin-10 (IL-10), were measured in tumor cells.
- Immune responses, specifically T helper cells type 2 (Th2) and T cytotoxic cells type 1 (Tc1) populations, were analyzed.
Main Results:
- Black tea treatment significantly reduced TGF-beta and IL-10 secretion by EAC cells in vivo.
- The reduction in immunosuppressive cytokines prevented the typical Th2 dominance observed in tumor bearers.
- Black tea initiated a shift towards a Th1/Tc1 immune response, enhancing anti-tumor immunity.
Conclusions:
- Black tea possesses anticancer properties by rejuvenating cancer immunosurveillance.
- Modulation of cytokine profiles by black tea helps restore a balanced immune response.
- Black tea promotes Th1/Tc1 dominance, counteracting tumor-induced immune suppression.
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