Clonal Hematopoiesis and the Heart: a Toxic Relationship

Area of Science:

• Hematology
• Cardiovascular Medicine
• Genetics

Background:

• Clonal hematopoiesis (CH) involves the age-related expansion of hematopoietic stem cell clones.
• CH arises from somatic mutations, mosaic chromosomal alterations (mCAs), or copy number variants.
• While linked to blood cancers, CH is increasingly associated with adverse cardiovascular outcomes.

Purpose of the Study:

• To review the association between clonal hematopoiesis and cardiovascular diseases.
• To explore the mechanistic links between CH and cardiovascular morbidity.
• To identify potential therapeutic targets for CH-related cardiovascular complications.

Main Methods:

• Review of clinical outcome studies.
• Analysis of data from mouse models.
• Investigation of molecular mechanisms underlying CH-associated cardiovascular pathology.

Main Results:

• CH mutations correlate with or cause atherosclerosis, heart failure, myocardial infarction, stroke, and other cardiovascular conditions.
• CH contributes to adverse outcomes in procedures like TAVR and heart transplantation.
• Mechanisms include inflammatory cytokine secretion (IL-1β, IL-6) and immune cell infiltration.

Conclusions:

• CH mutations promote harmful inflammation and arterial wall invasion by bone marrow-derived cells.
• This leads to significantly poorer cardiovascular health and outcomes.
• Targeting IL-1β or JAK2 signaling may prevent CH-related cardiovascular morbidity and mortality.