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Updated: Aug 11, 2026
09:41
Confocal Imaging of Neuropeptide Y-pHluorin: A Technique to Visualize Insulin Granule Exocytosis in Intact Murine and Human Islets
Published on: September 13, 2017
Summary
Autonomic nerves control salivary secretion using neurotransmitters that activate signaling pathways. These pathways involve N (or G) proteins and second messengers like cAMP or inositol trisphosphate, initiating secretion.
Area of Science:
- Physiology
- Cell Biology
- Neuroendocrinology
Background:
- Salivary secretion is primarily regulated by the autonomic nervous system.
- Neural signals are transmitted to acinar cells via neurotransmitters, acting as first messengers.
- Receptor activation initiates intracellular signal transduction pathways.
Purpose of the Study:
- To elucidate the key signal transduction mechanisms in salivary gland acinar cells.
- To describe the role of N (or G) proteins and second messengers in salivary secretion.
Main Methods:
- Review of established knowledge on autonomic control of salivary glands.
- Analysis of molecular mechanisms of neurotransmitter receptor signaling.
- Identification of key intracellular signaling molecules involved.
Main Results:
- Two major transduction pathways identified: cAMP generation and polyphosphoinositide breakdown.
- Both pathways involve N (or G) proteins activated by GTP.
- Activated N proteins regulate enzymes like adenylate cyclase and phospholipase C.
Conclusions:
- Neurotransmitter binding to receptors triggers N (or G) protein-mediated signaling.
- Second messengers (cAMP, IP3/DAG) translate extracellular signals into intracellular responses.
- These pathways are crucial for initiating salivary secretion of fluid, electrolytes, and proteins.
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