Smooth Muscle Cell Phenotypic Diversity.

Area of Science:

• Vascular Biology
• Cellular Phenotyping
• Genomics

Background:

• Vascular smooth muscle cells (SMC) are crucial for blood pressure regulation and vessel integrity.
• SMC possess dynamic phenotypic plasticity, enabling vascular remodeling in physiological and pathological conditions.
• Recent advances in lineage tracing have reshaped understanding of SMC contributions to vascular diseases like atherosclerosis.

Purpose of the Study:

• To review key findings from lineage and clonality tracing studies on SMC.
• To highlight evidence supporting SMC phenotypic diversity in healthy and diseased vasculature.
• To discuss the integration of lineage tracing with single-cell transcriptomics for SMC research.

Main Methods:

• In vivo fate mapping and lineage tracing systems for SMC identification and tracking.
• High-throughput transcriptomics and single-cell RNA sequencing (scRNAseq) for detailed phenotypic characterization.
• Review of existing literature on SMC phenotypic transitions and their functional relevance.

Main Results:

• Lineage tracing studies demonstrate SMC phenotypic transitions, adopting alternative cell-type markers.
• Vascular SMC populate injured vessels through oligoclonal expansion of medial SMC.
• Evidence supports significant SMC phenotypic diversity in both healthy and diseased vascular tissues.

Conclusions:

• Lineage tracing and scRNAseq offer powerful tools to dissect SMC heterogeneity.
• Further research is needed to understand the functional implications of SMC phenotypic plasticity.
• Identifying mechanisms controlling SMC phenotypic transitions is critical for therapeutic strategies.