This occurs in highly confluent cells where AR mRNA levels are considerably reduced as compared with those in proliferating cells.30 As in the case of the physiological AR down regulation associated with sexual maturation, the in vitro decrease in ARs induced by growth arrest appears to be due to transcriptional blockade derived from lower binding of nuclear transcription factors to the AR promoter.18 The fow level of AR expression in growth-arrested cells is reduced even further by incubation with TGF-8,32 or stimulated by PDGF.33 The evidence accumulated on the regulation of AR expression in RPSMC is useful to define mechanisms of control operating autocrinely on the smooth muscle and to help to interpret the in vivo results
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G., Krentz, J
This ensures the isolation of both active peptides from residual solvents or truncated sequences