Search results for: Recombinant Human Androgen receptor Proteins
#33982774 2021/05/13 To Up
Proliferating cell nuclear antigen directly interacts with androgen receptor and enhances androgen receptorâmediated signaling.Androgen receptor (AR) and/or its constitutively active splicing variants (ARâVs), such as ARâV7 and ARv567es, is required for prostate cancer cell growth and survival, and cancer progression. Proliferating cell nuclear antigen (PCNA) is preferentially overexpressed in all cancers and executes its functions through interaction with numerous partner proteins. The aim of the present study was to investigate the potential role of PCNA in the regulation of AR activity. An identical consensus sequence of the PCNAâinteracting proteinâbox (PIPâbox) was identified at the Nâterminus of human, mouse and rat AR proteins. It was found that PCNA complexes with the fullâlength AR (ARâFL) and ARâV7, which can be attenuated by the small molecule PIPâbox inhibitor, T2AA. PCNA also complexes with ARv567es and recombinant AR protein. The PCNA inhibitors, PCNAâI1S and T2AA, inhibited AR transcriptional activity and the expression of AR target genes in LNCaPâAI and 22Rv1 cells, but not in ARânegative PCâ3 cells. The knockdown of PCNA expression reduced dihydrotestosteroneâstimulated AR transcriptional activity and abolished the inhibitory effect of PCNAâI1S on AR activity. The PCNA inhibitor, PCNAâI1, exerted additive growth inhibitory effects with androgen deprivation and enzalutamide in cells expressing ARâFL or ARâFL/ARâV7, but not in ARânegative PCâ3 cells. Finally, R9âARâPIP, a small peptide mimicking AR PIPâbox, was found to bind to GFPâPCNA at K of 2.73Â ÂµM and inhibit the expression of AR target genes, AR transcriptional activity and the growth of ARâexpressing cells. On the whole, these data strongly suggest that AR is a PCNA partner protein and interacts with PCNA via the PIPâbox and that targeting the PCNAâAR interaction may represent an innovative and selective therapeutic strategy against prostate cancer, particularly castrationâresistant prostate cancers overexpressing constitutively active ARâVs.
Shan Lu, Zhongyun Dong
1239 related Products with: Proliferating cell nuclear antigen directly interacts with androgen receptor and enhances androgen receptorâmediated signaling.100ul100ul200ul100ug100ug0.1 mg5mg50 ug 200 100ul100.00 ul200ul
#33724574 // To Up
Follicle-stimulating hormone promotes growth of human prostate cancer cell line-derived tumor xenografts.Chemical castration in prostate cancer can be achieved with gonadotropin-releasing hormone (GnRH) agonists or antagonists. Their effects differ by the initial flare of gonadotropin and testosterone secretion with agonists and the immediate pituitary-testicular suppression by antagonists. While both suppress luteinizing hormone (LH) and follicle-stimulating hormone (FSH) initially, a rebound in FSH levels occurs during agonist treatment. This rebound is potentially harmful, taken the expression of FSH receptors (R) in prostate cancer tissue. We herein assessed the role of FSH in promoting the growth of androgen-independent (PC-3, DU145) and androgen-dependent (VCaP) human prostate cancer cell line xenografts in nude mice. Gonadotropins were suppressed with the GnRH antagonist degarelix, and effects of add-back human recombinant FSH were assessed on tumor growth. All tumors expressed GnRHR and FSHR, and degarelix treatment suppressed their growth. FSH supplementation reversed the degarelix-evoked suppression of PC-3 tumors, both in preventive (degarelix and FSH treatment started upon cell inoculation) and therapeutic (treatments initiated 3Â weeks after cell inoculation) setting. A less marked, though significant FSH effect occurred in DU145, but not in VCaP xenografts. FSHR expression in the xenografts supports direct FSH stimulation of tumor growth. Testosterone supplementation, to maintain the VCaP xenografts, apparently masked the FSH effect on their growth. Treatment with the LH analogue hCG did not affect PC-3 tumor growth despite their expression of luteinizing hormone/choriongonadotropin receptor. In conclusion, FSH, but not LH, may directly stimulate the growth of androgen-independent prostate cancer, suggesting that persistent FSH suppression upon GnRH antagonist treatment offers a therapeutic advantage over agonist.
Olayiwola O Oduwole, Ariel Poliandri, Anthony Okolo, Phil Rawson, Milena Doroszko, Marcin Chrusciel, Nafis A Rahman, Gilberto Serrano de Almeida, Charlotte L Bevan, Wolfgang Koechling, Ilpo T Huhtaniemi
1546 related Products with: Follicle-stimulating hormone promotes growth of human prostate cancer cell line-derived tumor xenografts.0.1 mg50 ug1 mg5 x 50 ug1 mg1.00 flask2ug100.00 ug1 mg100 μg 100ul96/kit
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#32668201 2020/07/14 To Up
Structural Insights of Transcriptionally Active, Full-Length Androgen Receptor Coactivator Complexes.Steroid receptors activate gene transcription by recruiting coactivators to initiate transcription of their target genes. For most nuclear receptors, the ligand-dependent activation function domain-2 (AF-2) is a primary contributor to the nuclear receptor (NR) transcriptional activity. In contrast to other steroid receptors, such as ERÎ±, the activation function of androgen receptor (AR) is largely dependent on its ligand-independent AF-1 located in its N-terminal domain (NTD). It remains unclear why AR utilizes a different AF domain from other receptors despite that NRs share similar domain organizations. Here, we present cryoelectron microscopy (cryo-EM) structures of DNA-bound full-length AR and its complex structure with key coactivators, SRC-3 and p300. AR dimerization follows a unique head-to-head and tail-to-tail manner. Unlike ERÎ±, AR directly contacts a single SRC-3 and p300. The AR NTD is the primary site for coactivator recruitment. The structures provide a basis for understanding assembly of the AR:coactivator complex and its domain contributions for coactivator assembly and transcriptional regulation.
Xinzhe Yu, Ping Yi, Ross A Hamilton, Hong Shen, Muyuan Chen, Charles E Foulds, Michael A Mancini, Steven J Ludtke, Zhao Wang, Bert W O'Malley
1205 related Products with: Structural Insights of Transcriptionally Active, Full-Length Androgen Receptor Coactivator Complexes.5 x 50 ug100ug/vial1mg50 ug1 ml100 µg100ug200ul200ug50 ug 100ul100ug
#32392092 2020/05/11 To Up
A Mechanistic High-Content Analysis Assay Using a Chimeric Androgen Receptor That Rapidly Characterizes Androgenic Chemicals.Human health is at risk from environmental exposures to a wide range of chemical toxicants and endocrine-disrupting chemicals (EDCs). As part of understanding this risk, the U.S. Environmental Protection Agency (EPA) has been pursuing new high-throughput in vitro assays and computational models to characterize EDCs. EPA models have incorporated our high-content analysis-based green fluorescent protein estrogen receptor (GFP-ER): PRL-HeLa assay, which allows direct visualization of ER binding to DNA regulatory elements. Here, we characterize a modified functional assay based on the stable expression of a chimeric androgen receptor (ARER), wherein a region containing the native AR DNA-binding domain (DBD) was replaced with the ERÎ± DBD (amino acids 183-254). We demonstrate that the AR agonist dihydrotestosterone induces GFP-ARER nuclear translocation, PRL promoter binding, and transcriptional activity at physiologically relevant concentrations (<1 nM). In contrast, the AR antagonist bicalutamide induces only nuclear translocation of the GFP-ARER receptor (at Î¼M concentrations). Estradiol also fails to induce visible chromatin binding, indicating androgen specificity. In a screen of reference chemicals from the EPA and the Agency for Toxic Substances and Disease Registry, the GFP-ARER cell model identified and mechanistically grouped activity by known (anti-)androgens based on the ability to induce nuclear translocation and/or chromatin binding. Finally, the cell model was used to identify potential (anti-)androgens in environmental samples in collaboration with the Houston Ship Channel/Galveston Bay Texas A&M University EPA Superfund Research Program. Based on these data, the chromatin-binding, in vitro assay-based GFP-ARER model represents a selective tool for rapidly identifying androgenic activity associated with drugs, chemicals, and environmental samples.
Adam T Szafran, Michael J Bolt, Caroline E Obkirchner, Maureen G Mancini, Christine Helsen, Frank Claessens, Fabio Stossi, Michael A Mancini
2839 related Products with: A Mechanistic High-Content Analysis Assay Using a Chimeric Androgen Receptor That Rapidly Characterizes Androgenic Chemicals.100ug400Tests200ul200ug100ug200 5mg100ug1000 50 ug 50 ug
#32277850 2020/04/11 To Up
Testosterone-androgen receptor: The steroid link inhibiting TRPM8-mediated cold sensitivity.Recent studies have revealed gender differences in cold perception, and pointed to a possible direct action of testosterone (TST) on the cold-activated TRPM8 (Transient Receptor Potential Melastatin Member 8) channel. However, the mechanisms by which TST influences TRPM8-mediated sensory functions remain elusive. Here, we show that TST inhibits TRPM8-mediated mild-cold perception through the noncanonical engagement of the Androgen Receptor (AR). Castration of both male rats and mice increases sensitivity to mild cold, and this effect depends on the presence of intact TRPM8 and AR. TST in nanomolar concentrations suppresses whole-cell TRPM8-mediated currents and single-channel activity in native dorsal root ganglion (DRG) neurons and HEK293 cells co-expressing recombinant TRPM8 and AR, but not TRPM8 alone. AR cloned from rat DRGs shows no difference from standard AR. However, biochemical assays and confocal imaging reveal the presence of AR on the cell surface and its interaction with TRPM8 in response to TST, leading to an inhibition of channel activity.
Dimitra Gkika, StÃ©phane Lolignier, Guillaume P Grolez, Alexis Bavencoffe, Georges Shapovalov, Dmitri Gordienko, Artem Kondratskyi, Mathieu Meleine, Laetitia Prival, Eric Chapuy, Monique Etienne, Alain Eschalier, Yaroslav Shuba, Roman Skryma, JÃ©rÃ´me Busserolles, Natalia Prevarskaya
1218 related Products with: Testosterone-androgen receptor: The steroid link inhibiting TRPM8-mediated cold sensitivity.1 ml200ul50 ug 200ug100ug200 100ug200ul1000 100ug5mg100ug
#32057540 2020/02/11 To Up
Deep androgen receptor suppression in prostate cancer exploits sexually dimorphic renal expression for systemic glucocorticoid exposure.Enzalutamide and apalutamide are potent next-generation androgen receptor (AR) antagonists used in metastatic and non-metastatic prostate cancer. Metabolic, hormonal and immunologic effects of deep AR suppression are unknown. We hypothesized that enzalutamide and apalutamide suppress 11Î²-hydroxysteroid dehydrogenase-2 (11Î²-HSD2), which normally converts cortisol to cortisone, leading to elevated cortisol concentrations, increased ratio of active to inactive glucocorticoids and possibly suboptimal response to immunotherapy. On-treatment glucocorticoid changes might serve as an indicator of active glucocorticoid exposure and resultant adverse consequences.
M Alyamani, J Li, M Patel, S Taylor, F Nakamura, M Berk, C Przybycin, E M Posadas, R A Madan, J L Gulley, B Rini, J A Garcia, E A Klein, N Sharifi
2039 related Products with: Deep androgen receptor suppression in prostate cancer exploits sexually dimorphic renal expression for systemic glucocorticoid exposure.
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#31041742 // To Up
Detection of ADP-Ribosylation of the Androgen Receptor Using the Recombinant Macrodomain AF1521 from Archaeoglobus fulgidus.ADP-ribosylation is a posttranslational modification generated by members of the superfamily of ADP-ribosyltransferases, known as the Parp enzymes. Depending on the superfamily member, Parp enzymes can mono- or poly-ADP-ribosylate a protein substrate. Parp superfamily members confer regulation to a variety of biological processes that include cell signaling, DNA repair, transcription, and stress responses. Here, we describe biochemical methods for detection of ADP-ribose conjugated to the androgen receptor (AR) using the archaeal macrodomain, AF1521, from Archaeoglobus fulgidus. The utility of AF1521 is based on its highly selective recognition of ADP-ribose conjugated to protein. AF1521 immobilized on beads can be used to enrich for ADP-ribosylated proteins, which in our application results in recovery of ADP-ribosylated AR from prostate cancer cell extracts. We engineered tandem AF1521 macrodomains and found this improves the recovery of ADP-ribosylated AR under native conditions, and it enabled development of an assay for detection of ADP-ribosylation on blots. Thus, AF1521 can be used to query ADP-ribosylation of protein under both native and denaturing conditions. Our assays should prove useful for understanding how ADP-ribosylation regulates AR function.
Teddy Kamata, Chun-Song Yang, Kasey Jividen, Adam Spencer, Natalia Dworak, Luke T Oostdyk, Bryce M Paschal
2591 related Products with: Detection of ADP-Ribosylation of the Androgen Receptor Using the Recombinant Macrodomain AF1521 from Archaeoglobus fulgidus.100 IU1mg500IU50 IU10200 units2200 units100ul2000 IU100
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