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The researchers noted, "At 49 hours, androgen receptor protein increased 30% as assayed by immunoblots and 79% as assayed by ligand binding" [the later method is the more reliable and indicative of biological effect. buy online anabolic steroid Bodybuilding-clothing. ]Molecular Endocrinology (1993) 7 924. In vitro, it was determined by Northern blot analysis that mRNA levels decreased when supraphysiological levels of androgen were compared to zero androgen in cancer cells. Levels of ARs were measured, and there was no observed decrease despite the observed decrease in mRNA level (as measured by Northern blot. buy online anabolic steroid Anabolic steroid side effects. )Molecular and Cellular Endocrinology (1995) 115 177. COS 1 cells were transfected with human AR DNA with the CMV promoter. The authors state that the DNA sequence responsible for downregulation of the AR is encoded within the AR DNA, not the promoter region. buy online anabolic steroid Oral-steroids. Dexamethasone [a glucocorticoid drug similar to cortisol] was observed to result in downregulation of AR mRNA relative to zero dexamethasone level. Androgen also had this effect, but did not result in lower levels of androgen receptors. This was attributed to increase in androgen receptor half life caused by androgen administration. The observed androgen downregulation effect relative to zero androgen ended at a concentration of 0. 1 nanomolar of androgen (methyltrienolone) - higher doses, to 100 nanomolar, resulted in no further downregulation of AR mRNA production. While this list is not complete, I am not omitting any studies that appear to have any better evidence - indeed, any evidence at all - that supraphysiological levels of androgen result in downregulation, relative to normal androgen levels, of the AR The above is a reasonably complete picture of the research evidence that might be used to support the bodybuilding theory of AR downregulation. When analyzed closely, no scientific study provides support for that theory. Scientific evidence indicating that a biochemical mechanism for upregulation does existEven in the above evidence which apparently (at first sight) might seem in favor of downregulation, it was sometimes seen that actual levels of the AR increased, even going from zero to normal (rather than normal to supraphysiological. ) This is upregulation of the receptor, since as we recall, regulation is the control of the number of receptors, and this control may be achieved by change in the half life of the receptors. Increased half life of the receptor, all else being equal, or perhaps with change in half-life overcoming other factors, can yield higher receptor numbers. Kemppainen et al.
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