Genetic influence on inflammation variables in the elderly

Area of Science:

• Gerontology
• Cardiovascular Disease Research
• Immunology

Background:

• Inflammation markers such as C-reactive protein (CRP), fibrinogen, and soluble intercellular adhesion molecule-1 (sICAM-1) are established cardiovascular disease (CVD) risk factors.
• The extent to which genetic factors regulate these inflammatory markers, particularly in older populations, remains largely unknown.

Purpose of the Study:

• To determine the heritability of key inflammation variables (CRP, fibrinogen, sICAM-1) and related cytokines (IL-6, TNF-alpha) in elderly individuals.
• To investigate the influence of specific genetic polymorphisms on plasma levels of these inflammation markers.

Main Methods:

• A twin study design involving 129 monozygotic and 153 dizygotic same-sex twin pairs aged 73-94 years.
• Analysis of plasma levels of CRP, fibrinogen, sICAM-1, IL-6, and TNF-alpha.
• Assessment of genetic polymorphisms' contribution to variation in these markers.

Main Results:

• Substantial heritability was observed for the inflammation variables, with genetic factors accounting for 20% to 55% of their plasma level variations.
• Soluble intercellular adhesion molecule-1 (sICAM-1) exhibited the highest heritability among the measured markers.
• Studied genetic polymorphisms had a minimal, non-significant impact on the observed heritability.

Conclusions:

• The findings provide strong evidence for a significant genetic contribution to inflammatory cardiovascular risk factors in the elderly population.
• Understanding the genetic basis of inflammation in aging is crucial for developing targeted CVD prevention strategies.