| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Submitted on August 4, 2003
Accepted on October 16, 2003
B Activates Transcription of the Androgen Receptor Gene in Sertoli Cells Isolated from Testes of Adult Rats*#
1 Division of Reproductive Biology, Department of Biochemistry and Molecular Biology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205; Department of Molecular Medicine, Institute of Biotechnology, University of Texas Health Science Center at San Antonio, San Antonio, TX 78245
* To whom correspondence should be addressed. E-mail: tbrown{at}jhsph.edu.
The androgen receptor (AR) in Sertoli cells mediates the actions of testosterone on spermatogenesis. However, the transcription factors responsible for AR gene regulation in Sertoli cells remain unknown. In this study, we determined that nuclear factor-
B (NF-B) regulates transcription of AR in primary cultures of Sertoli cells isolated from testes of adult rats. Electrophoretic mobility shift (EMSA) and antibody supershift assays with nuclear extracts prepared from Sertoli cells identified two binding sites, termed B1 at -491/-482 bp and B2 at -574/-565 bp, upstream of the transcription start site of the AR gene that bind the NF-B subunits, p50 and p65. DNase I footprint analyses showed that binding of the p50 NF-B subunit protected the same regions on the rat AR promoter. Analyses of AR promoter-luciferase reporter gene activity following transfection of primary cultures of Sertoli cells demonstrated that mutation of the B2 site or combined mutation of the B1/B2 sites reduced activity by 40%. Preferential binding of the transcriptionally active p65/p50 heterodimer to the B2 site rather than to the B1 site supported these observations. Overexpression of the NF-B p65 and p50 subunits in Sertoli cells increased activity from the wild-type AR promoter and the promoter with mutation of the B1 site, but not the B2 site. Activity was further stimulated by CBP, a co-activator of p65 transcriptional activity. Taken together, our data show that NF-B is an activator of AR gene transcription in Sertoli cells and may be an important determinant of androgen activity during spermatogenesis.
B •
rogen receptor •
testis •
Sertoli cell
This article has been cited by other articles:
 |
|
 |
|
  A. Seaton, P. Scullin, P. J. Maxwell, C. Wilson, J. Pettigrew, R. Gallagher, J. M. O'Sullivan, P. G. Johnston, and D. J. J. Waugh Interleukin-8 signaling promotes androgen-independent proliferation of prostate cancer cells via induction of androgen receptor expression and activation Carcinogenesis, June 1, 2008; 29(6): 1148 - 1156. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. M.R. Bhuiyan, Y. Li, S. Banerjee, F. Ahmed, Z. Wang, S. Ali, and F. H. Sarkar Down-regulation of Androgen Receptor by 3,3'-Diindolylmethane Contributes to Inhibition of Cell Proliferation and Induction of Apoptosis in Both Hormone-Sensitive LNCaP and Insensitive C4-2B Prostate Cancer Cells. Cancer Res., October 15, 2006; 66(20): 10064 - 10072. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 R.-S. Fujino, K. Tanaka, M. Morimatsu, K. Tamura, H. Kogo, and T. Hara Spermatogonial Cell-Mediated Activation of an I{kappa}B{zeta}-Independent Nuclear Factor-{kappa}B Pathway in Sertoli Cells Induces Transcription of the Lipocalin-2 Gene Mol. Endocrinol., April 1, 2006; 20(4): 904 - 915. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 L. Yang, S. Xie, Md. S. Jamaluddin, S. Altuwaijri, J. Ni, E. Kim, Y.-T. Chen, Y.-C. Hu, L. Wang, K.-H. Chuang, et al. Induction of Androgen Receptor Expression by Phosphatidylinositol 3-Kinase/Akt Downstream Substrate, FOXO3a, and Their Roles in Apoptosis of LNCaP Prostate Cancer Cells J. Biol. Chem., September 30, 2005; 280(39): 33558 - 33565. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH |
| Endocrinology | Endocrine Reviews | J. Clin. End. & Metab. |
| Molecular Endocrinology | Recent Prog. Horm. Res. | All Endocrine Journals |
