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Corticotropin-releasing hormone regulates IL-6 expression during inflammation
M Venihaki1, P Dikkes, A Carrigan
1Division of Endocrinology, Children's Hospital, Harvard Medical School, 300 Longwood Ave., Boston, MA 02115, USA.
The Journal of Clinical Investigation
|October 17, 2001
Summary
Corticotropin-releasing hormone (CRH) deficiency impairs the full hypothalamic-pituitary-adrenal (HPA) axis response to inflammation, altering interleukin-6 (IL-6) levels and impacting immune regulation.
Area of Science:
- Neuroendocrinology
- Immunology
- Inflammation Research
Background:
- The hypothalamic-pituitary-adrenal (HPA) axis regulates the inflammatory response via glucocorticoid release.
- Interleukin-6 (IL-6) is implicated in HPA axis stimulation during immune activation, potentially independent of corticotropin-releasing hormone (CRH).
Purpose of the Study:
- To investigate the role of CRH in IL-6 expression and IL-6-mediated HPA axis activation during inflammation.
- To elucidate the impact of CRH deficiency on the inflammatory response.
Main Methods:
- Utilized corticotropin-releasing hormone-deficient (Crh(-/-)) mice.
- Induced inflammation using turpentine.
- Measured plasma levels of adrenocorticotropin hormone (ACTH) and corticosterone.
- Assessed IL-6 expression in plasma and adrenal tissue.
Main Results:
- CRH deficiency affected ACTH increase but not corticosterone rise during inflammation.
- Plasma IL-6 paradoxically increased in CRH-deficient mice, suggesting CRH-dependent IL-6 release.
- Basal and inflammation-induced adrenal IL-6 expression were blocked in CRH-deficient mice.
- IL-6 may compensate for CRH deficiency's effects on food intake during inflammation.
- HPA axis response was defective in combined Crh(-/-)/IL-6(-/-) mice.
Conclusions:
- CRH plays a crucial role in regulating IL-6 expression and release during inflammation.
- The interaction between the immune system and the HPA axis, involving CRH and IL-6, is vital in inflammatory diseases.
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