Clonal haematopoiesis: connecting ageing and inflammation in cardiovascular disease

Area of Science:

• Hematology
• Cardiovascular Medicine
• Immunology

Background:

• Aging and inflammation are key drivers of cardiovascular disease risk.
• Clonal hematopoiesis of indeterminate potential (CHIP) arises from somatic mutations in hematopoietic stem cells, particularly DNMT3A, TET2, and ASXL1.
• CHIP is linked to adverse outcomes including cancer, death, and a doubled risk of atherosclerotic cardiovascular disease.

Purpose of the Study:

• To investigate the causal relationship between CHIP and cardiovascular disease.
• To explore the mechanisms linking CHIP mutations to increased cardiovascular risk.
• To identify potential therapeutic strategies for mitigating CHIP-associated cardiovascular risk.

Main Methods:

• Analysis of somatic mutations in hematopoietic stem cells in aging humans.
• Utilizing mouse models to establish causality between CHIP and cardiovascular disease.
• Investigating the impact of TET2 mutations on inflammatory gene expression in innate immune cells.

Main Results:

• CHIP is a common condition in aging individuals, associated with increased mortality and cancer risk.
• CHIP significantly elevates the risk of atherosclerotic cardiovascular disease.
• TET2 mutations in CHIP promote inflammatory gene expression, providing a mechanistic link to cardiovascular risk.

Conclusions:

• CHIP mutations contribute to age-related inflammation, explaining a portion of the increased cardiovascular risk.
• Targeting mutant clones or inflammatory mediators presents a potential therapeutic avenue for reducing cardiovascular disease risk in CHIP patients.