Vascular smooth muscle cells in atherosclerosis

Area of Science:

• Cardiovascular Biology
• Cellular Plasticity
• Atherosclerosis Research

Background:

• Vascular smooth muscle cells (VSMCs) are key components of atherosclerotic plaques.
• Traditional hypotheses suggested VSMCs differentiate into stable plaque cells.
• Recent lineage-tracing studies challenge these established roles.

Purpose of the Study:

• To review evidence for VSMC plasticity in atherosclerosis.
• To summarize the multifaceted roles of VSMCs and their derivatives in plaque progression.
• To highlight the need for precise attribution of VSMC functions for therapeutic development.

Main Methods:

• Review of existing literature and lineage-tracing studies.
• Analysis of VSMC phenotypic switching.
• Spatiotemporal assessment of VSMC contributions to plaque pathology.

Main Results:

• VSMCs exhibit significant phenotypic plasticity, adopting diverse cell-like identities.
• VSMCs contribute to plaque development and progression in complex ways, both beneficial and detrimental.
• Previous studies underestimated VSMC content and functional diversity within plaques.

Conclusions:

• VSMC plasticity fundamentally alters our understanding of their role in atherosclerosis.
• Targeting VSMCs requires precise understanding of their diverse, context-dependent functions.
• Future therapies must account for the plasticity and varied contributions of VSMCs and their derivatives.