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[Membrane reception of thyroid hormones]
Biokhimiia (Moscow, Russia)
|May 1, 1991
Summary
Thyroid hormones thyroxine (T4) and triiodothyronine (T3) bind to specific sites on rat cell membranes. Both protein and lipid membrane components are crucial for this thyroid hormone reception.
Area of Science:
- Biochemistry
- Cell Biology
- Endocrinology
Context:
- Thyroid hormones regulate metabolism and development.
- Cellular uptake and signaling mechanisms are key.
- Plasma membranes are critical interfaces for hormone action.
Purpose:
- To investigate the binding characteristics of thyroxine (T4) and triiodothyronine (T3) to rat liver, brain, and lung cell plasma membranes.
- To determine the influence of time, temperature, and concentration on hormone binding.
- To elucidate the roles of membrane protein and lipid components in thyroid hormone binding.
Summary:
- Comparative binding analyses revealed two distinct thyroid hormone-binding sites on rat liver, brain, and lung cell plasma membranes.
- Maximal binding occurred for T4 in liver and T3 in brain membranes, with higher affinity for T3.
- Trypsin treatment and partial delipidation affected binding parameters, suggesting involvement of both protein and lipid membrane elements.
Impact:
- This study proposes a significant role for both protein and lipid membrane components in the cellular reception of thyroid hormones.
- Findings contribute to understanding thyroid hormone transport and signaling at the cellular level.
- Provides insights into tissue-specific differences in thyroid hormone membrane interactions.