Lipopolysaccharides and Cellular Senescence: Involvement in Atherosclerosis

Area of Science:

• Cardiovascular Science
• Immunology
• Aging Research

Background:

• Atherosclerosis is a chronic inflammatory vascular disease linked to aging.
• Cellular senescence and bacterial infections were considered independent contributors to atherosclerosis.
• Senescent cells and bacterial components like lipopolysaccharide (LPS) are found in atherosclerotic lesions.

Purpose of the Study:

• To review the integrated roles of cellular senescence and bacterial infection in atherosclerosis.
• To explore how lipopolysaccharide (LPS) influences cellular senescence and inflammation in vascular cells.
• To propose a unified mechanism for atherosclerosis pathogenesis.

Main Methods:

• Literature review of studies on cellular senescence, bacterial infections, and atherosclerosis.
• Analysis of existing research on lipopolysaccharide (LPS) effects on vascular cells.
• Synthesis of findings to propose an integrated pathogenic pathway.

Main Results:

• Lipopolysaccharide (LPS) from Gram-negative bacteria can directly induce cellular senescence in macrophages and vascular cells.
• LPS enhances the inflammatory senescence-associated secretory phenotype (SASP) in senescent endothelial cells.
• This interaction suggests a synergistic role for LPS and senescence in driving atherosclerotic plaque development.

Conclusions:

• Bacterial LPS may exacerbate atherosclerosis by inducing and amplifying cellular senescence and SASP.
• This integrated mechanism offers novel therapeutic targets for preventing and treating atherosclerosis.
• Understanding this link is crucial for managing this prevalent age-related disease.