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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: OBJECTIVE, METHODS, RESULTS. Meshes: Animals, Endothelial Growth Factors, Lymphokines, Male, Orchiectomy, Prostate, Rats, Rats, Sprague-Dawley, Receptor Protein-Tyrosine Kinases, Receptors, Growth Factor, Receptors, Mitogen, Receptors, Vascular Endothelial Growth Factor, Testosterone, Vascular Endothelial Growth Factor A, Vascular Endothelial Growth Factors.
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Does testosterone induce vascular endothelial growth factor synthesis in the ventral prostate in castrated rats? Context: Recent studies suggest that the vasculature is important for the control of prostate growth. Castration induces an involution of the prostate gland and its vasculature. Replacement of testosterone stimulates endothelial cell proliferation and normalizes vascular volumes and blood flow several days before organ regrowth. Antiangiogenesis treatment inhibits the growth of prostate tumors. Understanding the regulation of the prostate vasculature may therefore provide important knowledge of the mechanisms responsible for the growth of non-malignant and malignant prostate tissue. Castration induced regression and testosterone stimulated regrowth of the prostatic vasculature have here been used to study the involvement of the angiogenic factor vascular endothelial growth factor (VEGF) and its receptors flt-1 and flk-1/KDR in the regulation of the prostatic vasculature. VEGF, flt-1, and flk-1/KDR levels were quantified in the rat ventral prostate following castration and testosterone replacement. Methods used were competitive RT-PCR, Western blot and immunohistochemistry. VEGF mRNA and protein levels were significantly decreased by castration and testosterone treatment induced VEGF synthesis in the rat ventral prostate epithelium. Flt-1 and flk-1/KDR receptor levels were unaffected by castration and testosterone treatment.
assistant
Castration down regulates VEGF and testosterone induces VEGF synthesis in epithelial cells in the rat ventral prostate. Final Decision: yes