Dehydroepiandrosterone modulates T-cell response after major abdominal surgery

Area of Science:

• Immunology
• Endocrinology
• Surgical Medicine

Background:

• T-helper (Th)1/Th2 cell balance is crucial for host defense against pathogens.
• Imbalance in Th1/Th2 cells can increase infection susceptibility post-major surgery.
• The role of steroid hormones, like dehydroepiandrosterone (DHEA), in surgical immune regulation is not well understood.

Purpose of the Study:

• To investigate the effect of dehydroepiandrosterone (DHEA) on T-helper (Th)1/Th2 balance in patients undergoing major abdominal surgery.
• To assess DHEA's impact on cytokine production and T-cell activation markers in the immediate postoperative period.

Main Methods:

• Blood samples collected from patients before and after major abdominal surgery.
• Isolation and culture of peripheral blood mononuclear cells with or without DHEA.
• Measurement of interleukin (IL)-2, interferon gamma, and IL-10 levels via ELISA.
• Flow cytometry analysis of CD4, CD8, and CD69 expression.

Main Results:

• DHEA significantly decreased IL-2 and IL-10 release in stimulated T cells from postoperative samples.
• Interferon gamma release was not affected by DHEA in phytohemagglutinin (PHA)-stimulated T cells.
• DHEA reduced CD69 expression on CD4(+) T cells, indicating decreased activation, while CD8(+) T cell activation remained unchanged.

Conclusions:

• Dehydroepiandrosterone (DHEA) plays a significant role in regulating Th1/Th2 balance in the early postoperative phase.
• DHEA's ability to attenuate both Th1 and Th2 responses may confer immunoprotective effects.
• Further research is warranted to explore the clinical relevance of DHEA in managing immune balance after major abdominal surgery.