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Identification of a prostate-specific G-protein coupled receptor in prostate cancer
1Center for Cancer Biology and Nutrition, Institute of Biosciences and Technology, Texas A&M University System Health Science Center, 2121 W. Holcombe Blvd., Houston, TX 77030, USA.
Abstract:
Membrane receptors coupled to heterotrimeric G-proteins play an essential role in the transmission of signals from the extracellular environment to the cytoplasm of the cell. A wide variety of external stimuli, including neurotransmitters, hormones, phospholipids, photons, odorants, taste ligands, and growth factors, can activate specific members of the G-protein coupled receptors (GPCRs). Besides essential functions in fully differentiated cells and tissues, GPCRs are also involved in embryogenesis, tissue regeneration, cell growth stimulation, and cell proliferation. In this study, we identified a novel prostate-specific G-protein coupled receptor that interacts with Galpha(12) in our yeast two-hybrid assays. The expression of the receptor protein is highly restricted to human prostate tissues using multiple-tissue Northern blot analysis, and tissue expression array. Furthermore, the expression of prostate-specific receptor is increased significantly in prostate tumors in comparison with the matched normal prostate tissues using PCR and Southern blot analysis, suggesting a potential role of this tissue-specific G-protein coupled receptor in prostate cancer development.
Insights
Researchers discovered a new G-protein coupled receptor (GPCR) specific to the prostate. Its expression increases in prostate tumors, suggesting a role in prostate cancer development.
Area of Science:
- Molecular Biology
- Cellular Signaling
- Oncology
Background:
- G-protein coupled receptors (GPCRs) are crucial for cellular signal transmission.
- GPCRs mediate responses to diverse extracellular stimuli like hormones and growth factors.
- These receptors are vital in cell growth, proliferation, and embryonic development.
Purpose of the Study:
- To identify and characterize novel prostate-specific G-protein coupled receptors.
- To investigate the role of a newly identified GPCR in prostate cancer.
Main Methods:
- Yeast two-hybrid assays to identify interacting proteins.
- Multiple-tissue Northern blot and tissue expression arrays for expression analysis.
- PCR and Southern blot analysis to compare expression in tumor vs. normal tissues.
Main Results:
- A novel prostate-specific G-protein coupled receptor interacting with Galpha(12) was identified.
- Receptor expression is highly restricted to human prostate tissues.
- Prostate tumor tissues exhibit significantly increased receptor expression compared to normal tissues.
Conclusions:
- The identified receptor is specifically expressed in the prostate.
- Elevated expression in prostate tumors suggests its involvement in prostate cancer progression.
- This prostate-specific GPCR represents a potential biomarker or therapeutic target for prostate cancer.