https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2669996/
Como eu costumo dizer, o DHT é um elo inicial da corrente, que se liga a outros elos (cadeia de eventos) nas pessoas geneticamente dispostas a AAG. Parece que tudo se liga de uma forma ou de outra, as vezes até meio contraditório. Esse caso abaixo é sobre próstata, mas se lrelaciona a essa proteína SFRP1.
"RESULTS
Inhibition of AR transcriptional activity by sFRP1
We conducted RT–PCR analysis of sFRP family gene expression using cell lines derived from normal prostate and prostate cancer and confirmed previous reports (Lodygin et al, 2005) that sFRP1 expression is reduced in prostate cancer cells (data not shown). To study whether sFRP1 could affect AR transcriptional activity, we expressed sFRP1 in 22Rv1 cells, an AR-positive prostate cancer cell line that does not express sFRP family members (data not shown), together with the androgen-responsive reporter MMTV-luciferase and a control reporter, and treated cells with the AR ligand dihydrotestosterone (DHT). As expected, DHT increased AR transcriptional activity (Figure 1A). Interestingly, transfection of sFRP1 expression plasmid repressed AR activity in a dose-dependent manner. To confirm this result in a more physiological context, we repeated these experiments using purified recombinant sFRP1 and found that this also repressed AR transcriptional activity (Figure 1B). In addition, RT–PCR analysis indicated that recombinant sFRP1 reduced expression of the endogenous AR target genes PSA and Kallikrein 2 (KLK2) (Figure 1C). These results indicate that sFRP1 has an inhibitory effect on AR transactivation in prostate cancer cells. To investigate which domains of sFRP1 are required for repression of AR, we used sFRP1 mutants lacking either the CRD (ΔCRD) or the C-terminal half containing the NTR domain (Δ1) (Uren et al, 2000). Δ1 and wild-type sFRP1 repressed AR to a similar extent, whereas ΔCRD had a significantly weaker effect (Figure 2A). Similar results were observed using LNCaP, another AR-expressing prostate cancer cell line (Figure 2B). These results indicate that the CRD is important for AR repression by sFRP1.
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Re: Pesquisadores encontram possível cura para a calvície
Jimmy Stewart
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