Involvement of gap junctional communication in secretion

Area of Science:

• Cell Biology
• Endocrinology
• Physiology

Background:

• Gap junctions' role in cell-to-cell transfer was first identified in glands.
• They are present in all multicellular secretory systems (exocrine, endocrine, pheromonal).

Purpose of the Study:

• To review the regulatory roles of gap junctions and connexin proteins in gland function.
• To summarize recent findings on gap junction involvement in secretory processes.

Main Methods:

• Literature review of studies on gap junctions in glands.
• Analysis of evidence for connexin protein roles in gland regulation.

Main Results:

• Gap junctions mediate cell-to-cell transfer of membrane-impermeant molecules in glands.
• Connexins regulate biosynthesis, storage, and release of secretory products.
• Gap junctions control secretory cell growth, differentiation, and gland morphogenesis.

Conclusions:

• Gap junctions play crucial regulatory roles in gland function beyond simple molecule transfer.
• Connexin proteins are key regulators in diverse secretory systems.