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Origins of Smooth Muscle Progenitor Cells in Transplant Arteriosclerosis.

The arterial adventitia harbors a niche environment that maintains resident vascular progenitor cells. Originally identified in the aortic adventitia of Apoe mice, it is now clear that adventitial progenitor cells (AdvPCs) are a heterogeneous mixture with multiple fate potentials. In fact, the combined fate potentials of all AdvPC subtypes described to date is sufficient to produce essentially all resident cell types of the artery wall. Therefore, the capacity of the adventitia to repair the wall and contribute to vascular disease is much greater than commonly thought.