Evidence that thymosins and other biologic response modifiers can function as neuroactive immunotransmitters

Area of Science:

• Neuroimmunology
• Neuroendocrinology
• Cellular Signaling

Background:

• Evidence suggests bidirectional communication circuits exist between the central nervous system (CNS) and the immune system.
• Soluble factors like thymosins, lymphokines, and complement proteins mediate communication from the immune system to the CNS.
• Lymphocytes produce opioid peptides, adrenocorticotropic hormone (ACTH), and thyroid-stimulating hormone (TSH), potentially involved in immunomodulatory neuroendocrine circuits.

Purpose of the Study:

• To propose and define the term "immunotransmitter" for molecules produced by immune cells that signal to neurons.
• To identify examples of immunotransmitters, including thymosins, lymphocyte-derived ACTH, TSH, beta-endorphin, interleukin-1, and interferon.
• To discuss the role of thymosin peptides as immunotransmitters modulating hypothalamic-pituitary-adrenal and gonadal axes.

Main Methods:

• Literature review and hypothesis formulation.
• Analysis of existing data on immune-CNS interactions.
• Discussion of proposed immunotransmitter functions.

Main Results:

• The concept of "immunotransmitters" is introduced to describe immune-derived signaling molecules.
• Specific examples of immunotransmitters are provided, including thymosins, ACTH, TSH, and cytokines.
• Evidence suggests thymosin peptides can modulate key neuroendocrine axes.

Conclusions:

• Immune cells produce signaling molecules (immunotransmitters) that influence the CNS.
• Immunotransmitters play a role in neuroendocrine regulation, particularly via thymosin peptides.
• This framework advances understanding of the complex interplay between immunity and the nervous system.