Estradiol and inflammatory markers in older men

Area of Science:

• Endocrinology
• Gerontology
• Immunology

Background:

• Aging is associated with a low-grade inflammatory state.
• In elderly men, low testosterone correlates with elevated pro-inflammatory cytokines.
• The role of estradiol (E2) in inflammation among older men remains unclear.

Purpose of the Study:

• To investigate the relationship between serum estradiol (E2) and inflammatory markers in older men.
• To determine if E2 influences inflammation independently of testosterone and other confounding factors.

Main Methods:

• Analysis of data from 399 men aged 65-95 years.
• Measurements included body mass index (BMI), serum E2, testosterone, IL-6, soluble IL-6 receptor, TNF-alpha, IL-1 receptor antagonist, and C-reactive protein.
• Multivariate linear models were used, adjusting for age, BMI, smoking, physical activity, chronic disease, and total testosterone.

Main Results:

• A weak positive association was found between estradiol (E2) and interleukin-6 (IL-6) (r = 0.19, P = 0.047) after adjustments.
• This relationship remained statistically significant (P = 0.032) after controlling for confounders.
• No significant association was observed between E2 and C-reactive protein, soluble IL-6 receptor, or TNF-alpha.

Conclusions:

• Estradiol (E2) is weakly positively associated with interleukin-6 (IL-6) in older men.
• This association is independent of testosterone levels and other confounders like BMI.