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Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay

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Protein hormones and immunity.

Keith W Kelley¹, Douglas A Weigent, Ron Kooijman

¹Laboratory of Integrative Immunophysiology, Integrative Immunology and Behavior Program, Department of Animal Sciences, College of ACES, 227 Edward R. Madigan Laboratory, 1201 West Gregory Drive, Urbana, IL 61801, USA. kwkelley@uiuc.edu

Brain, Behavior, and Immunity

|January 3, 2007

Summary

The endocrine and immune systems communicate via shared biochemical pathways. Neuroendocrine hormones like prolactin and growth hormone regulate immune cells, while inflammatory cytokines can cause hormone resistance.

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Area of Science:

Neuroendocrinology
Immunology
Physiology

Background:

The endocrine and immune systems exhibit significant physiological interactions.
Communication occurs through humoral (cytokines) and neural pathways.
Shared ligands and receptors facilitate bidirectional communication.

Purpose of the Study:

To review evidence on neuroendocrine-immune system interactions over 20 years.
To highlight the role of neuroendocrine protein hormones in immunity.
To present new findings on cellular-level communication and endocrine resistance.

Main Methods:

Review of scientific literature over the past 20 years.
Analysis of established communication pathways (humoral and neural).
Examination of hormonal influences on immune cells and vice versa.

Main Results:

Neuroendocrine protein hormones (prolactin, growth hormone, IGF-I, TSH) significantly influence immunity.
Immune processes, particularly inflammation via cytokines, impact the neuroendocrine system.
A novel cellular communication route involves inflammatory cytokines causing endocrine resistance.

Conclusions:

The brain acts as an immune-regulating organ.
Bidirectional communication between endocrine and immune systems is crucial for homeostasis.
Inflammation-induced endocrine resistance represents a key regulatory mechanism.