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Related Experiment Videos

Putative melatonin receptors in benign human prostate tissue

M Laudon1, E Gilad, H Matzkin

  • 1Neurim Pharmaceuticals Ltd, Department of Urology, Tel Aviv, Israel.

The Journal of Clinical Endocrinology and Metabolism
|April 1, 1996
PubMed
Summary

Melatonin may play a role in benign prostate hypertrophy (BPH). Researchers found melatonin binding sites in human BPH tissue, suggesting potential receptors that could influence prostate growth.

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Area of Science:

  • Endocrinology
  • Urology
  • Molecular Biology

Background:

  • Melatonin, a pineal gland hormone, is known to inhibit pubertal development and may suppress prostate growth.
  • Age-related decline in melatonin production correlates with increased prevalence of benign prostate hypertrophy (BPH) in humans.

Purpose of the Study:

  • To investigate the presence of melatonin binding sites in human BPH tissue.
  • To explore a potential causal relationship between reduced melatonin and BPH development.

Main Methods:

  • In vitro autoradiography using 125I-labeled melatonin (125I-melatonin) on human BPH tissue.
  • Separation and subcellular fractionation to localize binding sites.
  • Kinetic, equilibrium, and competition binding experiments to characterize binding properties.

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Main Results:

  • Specific 125I-melatonin binding was detected in the glandular epithelium of human BPH tissue, localized to the microsomal fraction.
  • Binding was time-dependent, reversible, and exhibited high and low affinity characteristics.
  • Melatonin competitively inhibited binding, with partial inhibition by a melatonin antagonist (ML-23) and minimal effect from serotonin or other tryptamines.

Conclusions:

  • The findings indicate the presence of putative melatonin receptors in the human prostate epithelium.
  • These receptors may be involved in the regulation of prostate growth and potentially BPH development.