Sorry didnt know, here is one I came across
Milk Thistle: Good for Livers, Potentially Bad for Gains
Title: Silymarin inhibits function of the androgen receptor by reducing nuclearlocalization of the receptor in the human prostate cancer cell line LNCaP.Authors: Zhu W, Zhang JS, Young CY.Source: Carcinogenesis 2001 Sep;22(9):1399-403
Research Summary
Agents with novel mechanisms of blocking androgen receptor (AR) function may be useful for prostate cancer prevention and therapy. Previous studies showed that silibinin (SB), the major active component of Milk Thistle, could inhibit cell proliferation of a human prostate cancer cell line by stopping the cell cycle without causing cell death. This study further demonstrates the potential molecular mechanism by which Milk Thistle acts on androgen-responsive prostate cancer cells by inhibiting function of the AR. We observed that Silymarin (SM) and SB inhibited androgen-stimulated cell proliferation as well as androgen-stimulated secretion of both prostate-specific antigen (PSA) and human glandular kallikrein (hK2).Additionally, for the first time, we show that SM and SB diminished transactivation activity of the AR. However, SM did not affect AR levels and steroid-binding ability of total AR in western blotting and ligand-binding assays. Intriguingly, we found that nuclear AR levels are significantly reduced by SM and SB in the presence of androgens. This study provides a new insight into how Milk Thistle negatively modulates androgen action in prostate cancer cells.
Discussion
Milk Thistle is a popular bodybuilding supplement and is currently the most well researched plant for the treatment of liver disease (with over 450 published peer review papers). Silymarin, a flavonoid extract from Milk Thistle, has been used clinically for alcoholic liver disease treatment in Europe and Asia for almost 2,000 years. Currently it?s used by bodybuilders as a protective measure for the liver when using high doses of orals.Silymarin is not water soluble and is typically administered as an encapsulated standardized extract. The absorption with oral administration is rather low, with only two to three percent being effectively taken up. The peak plasma levels after an oral dose are achieved in four to six hours. The reason this study is significant is because of the described mechanism that Milk Thistle is working in the prostate. It is showing effectiveness in treating prostate cancer because it prevents the androgen receptor from making it to the nucleus of the cell. This may be good if you are fighting cancer of the prostate, but it is bad if you are trying to get a muscle cell to grow larger.In order for testosterone to work, it must pass from the blood to the inside of a muscle cell, bind to the androgen receptor inside the cell, then travel inside the nucleus where it binds to your DNA.These researchers were able to show that Milk Thistle did not reduce the number of androgen receptors, nor did it prevent androgens (i.e., testosterone) from binding to the receptors. All it seemed to do was prevent the androgen receptor from traveling to the nucleus, and in our case, this prevents the desired effect. The androgen receptor, once bound to the androgen, must make it to the nucleus in order to increase protein synthesis.Bottom line: Use Milk Thistle if you are sure you are having liver toxicity problems. Then, only use it for a few weeks at a time. There are other herbs with tremendous hepatoprotective effects, so you might give them a try instead
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