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[Drug-receptor interactions in single smooth muscle cells]
I Takayanagi1, M Satoh, K Koike
1Department of Chemical Pharmacology, Toho University School of Pharmaceutical Sciences, Chiba, Japan.
Nihon Yakurigaku Zasshi. Folia Pharmacologica Japonica
|March 1, 1993
Summary
Isolated smooth muscle cells are valuable tools for studying drug-receptor interactions and post-receptor signaling. Research shows these single cells accurately reflect responses seen in intact tissues, aiding drug development.
Area of Science:
- Pharmacology
- Cell Biology
- Physiology
Context:
- Smooth muscle contraction is mediated by individual cell excitation.
- Studying drug-receptor interactions in intact tissues can be complex.
- Single smooth muscle cells offer a more direct model for pharmacological investigation.
Purpose:
- To evaluate the utility of isolated smooth muscle cells for studying drug-receptor interactions.
- To compare responses in single cells with those in intact tissues and membrane preparations.
- To investigate age-related changes in adrenergic receptor function in smooth muscle.
Summary:
- Isolated guinea pig and rabbit smooth muscle cells mimicked the pharmacological responses of intact tissues.
- Cholinergic and adrenergic drug interactions were consistent between single cells and tissue preparations.
- Age-related decreases in responsiveness were linked to post-receptor events, not receptor number or affinity.
Impact:
- Validated isolated smooth muscle cells as a reliable model for drug-receptor studies.
- Provided insights into the mechanisms of age-related smooth muscle dysfunction.
- Supported the existence of distinct alpha 1-adrenoceptor subtypes in vascular smooth muscle.