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Am J Physiol Cell Physiol. 2014 Jul 1;307(1):C25-38. doi: 10.1152/ajpcell.00084.2014. Epub 2014 Apr 30.

Type-2 pericytes participate in normal and tumoral angiogenesis.

Author information

1
Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina; Neuroscience Program, Wake Forest School of Medicine, Winston-Salem, North Carolina;
2
Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina;
3
Department of Radiology, Wake Forest School of Medicine, Winston-Salem, North Carolina; and.
4
Department of Radiology, Wake Forest School of Medicine, Winston-Salem, North Carolina; and Department of Neurosurgery, Wake Forest School of Medicine, Winston-Salem, North Carolina.
5
Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina; Neuroscience Program, Wake Forest School of Medicine, Winston-Salem, North Carolina; odelbono@wakehealth.edu.

Abstract

Tissue growth and function depend on vascularization, and vascular insufficiency or excess exacerbates many human diseases. Identification of the biological processes involved in angiogenesis will dictate strategies to modulate reduced or excessive vessel formation. We examine the essential role of pericytes. Their heterogeneous morphology, distribution, origins, and physiology have been described. Using double-transgenic Nestin-GFP/NG2-DsRed mice, we identified two pericyte subsets. We found that Nestin-GFP(-)/NG2-DsRed(+) (type-1) and Nestin-GFP(+)/NG2-DsRed(+) (type-2) pericytes attach to the walls of small and large blood vessels in vivo; in vitro, type-2, but not type-1, pericytes spark endothelial cells to form new vessels. Matrigel assay showed that only type-2 pericytes participate in normal angiogenesis. Moreover, when cancer cells were transplanted into Nestin-GFP/NG2-DsRed mice, type-1 pericytes did not penetrate the tumor, while type-2 pericytes were recruited during its angiogenesis. As inhibition of angiogenesis is a promising strategy in cancer therapy, type-2 pericytes may provide a cellular target susceptible to signaling and pharmacological manipulation in treating malignancy. This work also reports the potential of type-2 pericytes to improve blood perfusion in ischemic hindlimbs, indicating their potential for treating ischemic illnesses.

KEYWORDS:

angiogenesis; pericytes; stem cells; tumor

PMID:
24788248
PMCID:
PMC4080181
DOI:
10.1152/ajpcell.00084.2014
[Indexed for MEDLINE]
Free PMC Article

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