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Submandibular gland acinar cells express multiple alpha1-adrenoceptor subtypes
Charles S Bockman1, Michael R Bruchas, Wanyun Zeng
1Department of Pharmacology, Creighton University School of Medicine, 2500 California Plaza, Omaha, NE 68178, USA. cbockman@creighton.edu
Summary
This study validates the SMG-C10 cell line as a model for alpha(1)-adrenoceptor regulation of submandibular function. Both SMG-C10 cells and native glands express alpha(1A)- and alpha(1B)-adrenoceptor subtypes, supporting their use in research.
Area of Science:
- Pharmacology
- Cell Biology
- Physiology
Background:
- Alpha(1)-adrenoceptors regulate submandibular gland function.
- These receptors have three subtypes: alpha(1A), alpha(1B), and alpha(1D).
- Understanding subtype-specific regulation is crucial for submandibular physiology.
Purpose of the Study:
- To evaluate the SMG-C10 acinar cell line as a model for alpha(1)-adrenoceptor regulation.
- To characterize alpha(1)-adrenoceptor subtypes in SMG-C10 cells and compare them to native submandibular glands.
Main Methods:
- Reverse transcription-polymerase chain reaction (RT-PCR) to identify receptor mRNAs.
- [3H]prazosin binding assays with subtype-selective antagonists.
- Comparison of receptor expression and binding affinities between cell line and native tissue.
Main Results:
- RT-PCR confirmed the presence of alpha(1A), alpha(1B), and alpha(1D) adrenoceptor mRNAs in both SMG-C10 cells and submandibular glands.
- Binding studies indicated similar expression of alpha(1A) and alpha(1B) adrenoceptor proteins in both models.
- SMG-C10 cells showed a biphasic binding pattern for alpha(1A)-selective antagonist, suggesting distinct affinity sites.
Conclusions:
- SMG-C10 cells express alpha(1A)- and alpha(1B)-adrenoceptor subtypes, mirroring native submandibular glands.
- The SMG-C10 cell line is a suitable model for studying alpha(1)-adrenoceptor-mediated submandibular secretion.
- This model can advance research into salivary gland pharmacology and physiology.