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- W2000348620 abstract "Benign as well as malignant human prostatic tissues were evaluated for their content of somatostatin (SRIH) receptors (SRIH-R). In vitro receptor autoradiography techniques on cryostat sections were performed using 125I-labeled [Tyr3]octreotide as well as 125I-labeled [Leu8,D-Trp22,Tyr25]SRIH-28 as radioligands. SRIH-R were identified in all normal and hyperplastic prostates in the smooth muscles of the stroma, whereas the glands did not express the receptors. Muscular nodules were strongly receptor positive as well. The receptors were of high affinity (Kd = 0.4 nmol/L) and high specificity for biologically active SRIH analogs; high affinity for SRIH-14, SRIH-28, and octreotide was detected, suggesting the presence of the SSTR2 receptor subtype. In situ hybridization studies confirmed the presence of SSTR2 messenger ribonucleic acid in these tissues. Primary prostate cancers did not have SRIH-R identified with 125I-labeled [Tyr3]octreotide. However, they were expressing SRIH-R identified with 125I-labeled [Leu8,D-Trp22,Tyr25]SRIH-28, with a high affinity for SRIH-14 and SRIH-28, but low affinity for octreotide. The receptors were located on tumoral cells. In situ hybridization studies revealed a preferential expression of SSTR1. Primary human prostate cancers, therefore, express a different SRIH-R subtype than benign prostate tissue. Several veins and the ganglion cells from the prostatic plexus in the surroundings of the tumors were expressing SRIH-R with high affinity for octreotide as well. These data suggest that the human prostate as well as prostate cancers may be targets for SRIH therapy; however, SRIH analogs with different selectivities for SRIH-R subtypes are required in each case." @default.
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- W2000348620 date "1995-09-01" @default.
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- W2000348620 title "Somatostatin receptors in human prostate and prostate cancer." @default.
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- W2000348620 doi "https://doi.org/10.1210/jcem.80.9.7673428" @default.
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