Lymphocyte GH-axis hormones in immunity

Area of Science:

• Neuroimmunology
• Endocrinology
• Biochemistry

Background:

• Immune and neuroendocrine systems share ligands and receptors, forming a biochemical communication circuit.
• The immune system acts as a 'sixth sense,' alerting the nervous system to foreign entities.
• Neuroendocrine hormones influence immune cell function, and immune cells can produce neuroendocrine hormones.

Purpose of the Study:

• To review the interplay between the immune and neuroendocrine systems, focusing on growth hormone (GH).
• To highlight the known actions of GH on the immune system and the emerging role of immune cell-derived GH.
• To discuss the production and function of GH, GHRH, and IGF-1 within the immune system.

Main Methods:

• Literature review focusing on molecular and cellular actions of GH.
• Analysis of endocrine, autocrine, paracrine, and intracrine pathways of GH, GHRH, and IGF-1 signaling in immune cells.
• Discussion of current knowledge gaps regarding immune cell-derived GH.

Main Results:

• GH significantly influences immune system function at molecular and cellular levels.
• Immune cells produce GH, GHRH, and IGF-1, impacting immune responses.
• Evidence suggests immune cell-derived GH plays a crucial role in immunity.

Conclusions:

• GH is a critical mediator between the neuroendocrine and immune systems.
• Immune cell-derived GH represents a significant, yet underexplored, factor in immune regulation.
• Further research into intracellular mechanisms of immune cell GH is warranted to understand its physiological and pathological roles.