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Female steroid hormones and target cell nuclei
Science (New York, N.Y.)
|February 15, 1974
Summary
Female sex steroids regulate tissue enzymes and proteins by increasing specific messenger RNA (mRNA) synthesis, a process involving hormone-receptor complex binding to the genome and activating gene transcription.
Area of Science:
- Molecular Biology
- Endocrinology
- Biochemistry
Background:
- Steroid hormones exhibit significant variability in target-tissue responses.
- Female sex steroids influence enzyme and protein synthesis, activity, and degradation.
- These responses are contingent upon nuclear RNA synthesis.
Purpose of the Study:
- To elucidate the mechanism of steroid hormone action at the molecular level.
- To investigate the role of nuclear RNA synthesis in steroid-mediated responses.
- To provide quantitative evidence for steroid-induced changes in specific mRNA levels.
Main Methods:
- The study discusses the uptake and binding of steroid hormones to cytoplasmic receptors.
- It details the transport of the steroid-receptor complex to the nucleus.
- The research highlights the binding of the complex to genomic acceptor sites and subsequent transcriptional activation.
Main Results:
- Steroid hormones induce qualitative changes in RNA base composition and sequence, indicating effects on gene transcription.
- Direct quantitative evidence shows a net increase in intracellular specific mRNA molecules in target tissues.
- A six-step pattern of steroid hormone action is proposed, from cellular uptake to functional tissue response.
Conclusions:
- Steroid hormone action involves a complex pathway from receptor binding to protein synthesis and functional response.
- Further research is needed to understand how the hormone-receptor complex regulates nuclear RNA metabolism.
- Potential regulatory mechanisms include direct chromatin effects, polymerase activation, RNA breakdown inhibition, or RNA processing and transport.
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01:08Intracellular Hormone Receptors
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01:07Types of Receptors: Internal Receptors
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