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Related Experiment Videos

Profiling transcript levels for steroidogenic enzymes in fetal tissues.

Vincenzo Pezzi1, J M Mathis, William E Rainey

  • 1Department of Pharmaco-Biology, University of Calabria, Rende (Cosenza), 87036, Italy.

The Journal of Steroid Biochemistry and Molecular Biology
|December 16, 2003
PubMed
Summary

Steroidogenic enzyme transcripts, including StAR and CYP enzymes, are expressed in various human fetal tissues, not just endocrine organs. This local synthesis may influence fetal development through autocrine and paracrine actions.

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Developmental Biology

Background:

  • Steroid hormone synthesis is primarily attributed to cytochrome P450 (CYP) and hydroxysteroid dehydrogenase enzymes, predominantly found in endocrine tissues.
  • Evidence suggests these enzymes also function in non-endocrine tissues, potentially mediating local (paracrine/autocrine) effects.
  • During fetal development, high circulating steroid precursors may be metabolized in various tissues to produce active hormones.

Purpose of the Study:

  • To investigate the hypothesis that steroidogenic enzyme transcripts are present in non-classical steroidogenic fetal tissues.
  • To quantify mRNA levels of key steroidogenic enzymes and StAR in a range of human fetal tissues.

Main Methods:

  • Development and application of real-time reverse transcription polymerase chain reaction (RT-RTPCR) assays.

Related Experiment Videos

  • Quantification of mRNA for steroidogenic acute regulatory protein (StAR), CYP11A, HSD3B1, HSD3B2, CYP17, CYP21, CYP11B1, CYP11B2, and CYP19.
  • RNA isolation from human fetal tissues: adrenal, testis, ovary, placenta, aorta, brain, liver, kidney, heart, lung, pancreas, prostate, stomach, and thymus.

    • Main Results:

    • RT-RTPCR successfully detected and quantified mRNA levels of StAR and various steroidogenic enzymes in both endocrine and non-endocrine fetal tissues.
    • Transcript levels in non-endocrine tissues were lower than in classical steroidogenic organs but potentially sufficient for local effects.
    • Identified expression of enzymes involved in cholesterol conversion to steroid hormones across diverse fetal tissues.

    Conclusions:

    • RT-RTPCR is a sensitive method for detecting low-level expression of steroidogenic enzyme transcripts in fetal tissues.
    • Steroidogenic enzymes are expressed in a broader range of human fetal tissues than previously recognized.
    • Local synthesis of steroid hormones in fetal non-endocrine tissues may play a significant role in organ system development.