The Immune System in Cushing's Syndrome

Area of Science:

• Immunology
• Endocrinology
• Pathophysiology

Background:

• Cushing's syndrome (CS), or chronic hypercortisolism, significantly impacts the immune system.
• Immune alterations in CS involve both suppression and chronic inflammation, contributing to severe complications.
• Factors include prolonged glucocorticoid exposure, circadian disruption, and comorbidities.

Purpose of the Study:

• To review immune system changes in chronic hypercortisolism.
• To describe mechanisms of immune derangement in CS.
• To highlight the role of immune dysregulation in CS morbidity and mortality.

Main Methods:

• Literature review of studies on the immune system in Cushing's syndrome.
• Analysis of mechanisms underlying immune alterations.
• Synthesis of evidence linking immune changes to clinical complications.

Main Results:

• CS induces a complex immune profile, not solely immunosuppression, with traits of chronic inflammation.
• Elevated IL-1, IL-6, and TNFα, plus immune cell infiltration in adipose tissue, drive a non-resolving inflammatory state.
• This dysregulation contributes to CS complications like diabetes, atherosclerosis, and cognitive impairment, and rebound phenomena upon treatment.

Conclusions:

• Immune system alterations in CS are multifaceted, involving low-grade inflammation and impaired immune responses.
• Understanding these immune derangements is crucial for improving risk stratification and developing targeted therapies.
• Further research can guide tailored treatments and post-remission follow-up for CS patients.