Resident PW1(+) Progenitor Cells Participate in Vascular Remodeling During Pulmonary Arterial Hypertension

F Dierick, T Hery, B Hoareau-Coudert, N Mougenot, V Monceau, C Claude, Mihaela Crisan, V Besson, P Dorfmuller, G Marodon, E Fadel, M Humbert, E Yaniz-Galende, JS Hulot, G Marazzi, D Sassoon, F Soubrier, S Nadaud

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Rationale: Pulmonary arterial hypertension is characterized by vascular remodeling and neomuscularization. PW1(+) progenitor cells can differentiate into smooth muscle cells (SMCs) in vitro. Objective: To determine the role of pulmonary PW1(+) progenitor cells in vascular remodeling characteristic of pulmonary arterial hypertension. Methods and Results: We investigated their contribution during chronic hypoxia-induced vascular remodeling in Pw1(nLacZ+/-) mouse expressing beta-galactosidase in PW1(+) cells and in differentiated cells derived from PW1(+) cells. PW1(+) progenitor cells are present in the perivascular zone in rodent and human control lungs. Using progenitor markers, 3 distinct myogenic PW1(+) cell populations were isolated from the mouse lung of which 2 were significantly increased after 4 days of chronic hypoxia. The number of proliferating pulmonary PW1(+) cells and the proportion of beta-gal(+) vascular SMC were increased, indicating a recruitment of PW1(+) cells and their differentiation into vascular SMC during early chronic hypoxia-induced neomuscularization. CXCR4 inhibition using AMD3100 prevented PW1(+) cells differentiation into SMC but did not inhibit their proliferation. Bone marrow transplantation experiments showed that the newly formed beta-gal(+) SMC were not derived from circulating bone marrow-derived PW1(+) progenitor cells, confirming a resident origin of the recruited PW1(+) cells. The number of pulmonary PW1(+) cells was also increased in rats after monocrotaline injection. In lung from pulmonary arterial hypertension patients, PW1-expressing cells were observed in large numbers in remodeled vascular structures. Conclusions: These results demonstrate the existence of a novel population of resident SMC progenitor cells expressing PW1 and participating in pulmonary hypertension-associated vascular remodeling.
Original languageUndefined/Unknown
Pages (from-to)822-833
Number of pages12
JournalCirculation Research
Issue number5
Publication statusPublished - 2016

Research programs

  • EMC MGC-02-13-02

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