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The cytokine-HPA axis feed-back circuit
1Institute of Physiology, Div. of Immunophysiology, Philipps-University, Deutschhausstr. 2, 35037 Marburg, Germany.
Zeitschrift Fur Rheumatologie
|January 13, 2001
Summary
Endogenous glucocorticoids regulate immune cells and cytokine production. This creates a feedback loop with the hypothalamic-pituitary-adrenal (HPA) axis, controlling inflammation and immune cell expansion.
Area of Science:
- Immunology
- Endocrinology
- Neuroscience
Background:
- Endogenous glucocorticoids modulate immune cell function and cytokine synthesis.
- Cytokines produced during immune responses can activate the hypothalamic-pituitary-adrenal (HPA) axis.
- This interaction suggests a regulatory circuit between immune processes and the HPA axis.
Purpose of the Study:
- To elucidate the immunoregulatory role of the cytokine-HPA axis circuit.
- To understand how this circuit controls basal immune cell operation.
- To investigate the circuit's involvement in managing inflammatory reactions.
Main Methods:
- The study reviews existing evidence on glucocorticoid and cytokine interactions.
- It examines the impact of cytokines on HPA axis activation.
- It analyzes how elevated glucocorticoids influence immune cell activity and cytokine production.
Main Results:
- Glucocorticoids control basal immune cell activity and cytokine synthesis, influencing the Th1/Th2 balance.
- Immune-induced cytokines (e.g., IL-1, IL-6, TNF-alpha) activate the HPA axis.
- Increased glucocorticoids subsequently modulate immune cell activity and cytokine production, confirming a feedback loop.
Conclusions:
- A cytokine-HPA axis circuit exists, playing a key role in immune homeostasis.
- This circuit is crucial for limiting excessive inflammation and uncontrolled immune cell proliferation.
- Understanding this feedback mechanism is vital for immune system regulation.