PACS-1 Interacts with TRPC3 and ESyt1 to Mediate Protein Trafficking while Promoting SOCE and Cooperatively
Steven M Trothen1, Jack E Teplitsky1, Ryan E Armstong2
1Department of Microbiology and Immunology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, ON N6A 5C1, Canada.
ACS Omega
|August 19, 2024
Summary
Phosphofurin acidic cluster sorting protein 1 (PACS-1) regulates calcium entry and adrenocorticotropic hormone (ACTH) secretion by interacting with TRPC3 and ESyt1 proteins in pituitary cells.
Area of Science:
- Endocrinology
- Cell Biology
- Molecular Physiology
Background:
- Corticotropic cells secrete adrenocorticotropic hormone (ACTH) for cortisol and androgen production.
- Phosphofurin acidic cluster sorting protein 1 (PACS-1) is implicated in ACTH secretion, but its mechanism is unknown.
Purpose of the Study:
- To elucidate the role of PACS-1 in regulating calcium homeostasis and ACTH secretion.
- To investigate the interaction of PACS-1 with TRPC3 and ESyt1 proteins.
Main Methods:
- Co-immunoprecipitation assays to detect protein interactions.
- Immunofluorescence microscopy to assess protein localization.
- Calcium imaging to measure store-operated calcium entry (SOCE).
Main Results:
- PACS-1 directly interacts with TRPC3 and ESyt1.
- PACS-1 promotes TRPC3-ESyt1 complex formation and regulates their plasma membrane localization.
- PACS-1 is essential for normal SOCE and influences ACTH secretion via ESyt1.
Conclusions:
- PACS-1 plays a critical role in modulating intracellular calcium levels in corticotropic cells.
- PACS-1 regulates ACTH secretion through interactions with TRPC3 and ESyt1, impacting calcium signaling pathways.
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