Dynamic Interactions Between the Immune System and the Neuroendocrine System in Health and Disease

Area of Science:

• Immunology
• Neuroendocrinology
• Endocrinology

Background:

• The immune and neuroendocrine systems share structural and functional similarities.
• Both systems possess distributed networks that sense and respond to external stimuli.
• Extensive communication exists between the immune and neuroendocrine systems.

Purpose of the Study:

• To explore bi-directional immune-endocrine interactions, focusing on the hypothalamus-pituitary-thyroid (HPT) axis.
• To present novel findings on immune system-derived thyroid stimulating hormone (TSH) and its role in thyroid hormone synthesis and bone metamorphosis.
• To investigate the potential involvement of a TSHβ splice variant in autoimmune thyroid disease (AIT) and systemic infection responses.

Main Methods:

• Review of existing literature on immune-endocrine interactions.
• Analysis of novel findings concerning TSHβ splice variants produced by peripheral blood leukocytes (PBL).
• Discussion of the interplay between HPT axis hormones, adipose hormones, and immune function.

Main Results:

• Identification of a direct mechanism where immune system-derived TSH controls thyroid hormone synthesis and bone metamorphosis.
• Characterization of a novel TSHβ splice variant produced by PBL.
• Evidence suggesting the TSHβ splice variant may contribute to the development or persistence of AIT.
• Exploration of immune-endocrine responses to systemic infection and the role of adipose hormones.

Conclusions:

• The immune and neuroendocrine systems exhibit significant crosstalk, particularly involving the HPT axis.
• A novel TSHβ splice variant from leukocytes directly impacts thyroid function and bone health.
• This variant may play a role in the pathogenesis of autoimmune thyroid diseases.
• Systemic infections and adipose hormones also influence immune-endocrine communication.