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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Am+J+Respir+Crit+Care+Med 2016 ; 193 (8): 898-909 Nephropedia Template TP
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Bone Marrow?derived Cells Contribute to the Pathogenesis of Pulmonary Arterial Hypertension #MMPMID26651104
Yan L; Chen X; Talati M; Nunley BW; Gladson S; Blackwell T; Cogan J; Austin E; Wheeler F; Loyd J; West J; Hamid R
Am J Respir Crit Care Med 2016[Apr]; 193 (8): 898-909 PMID26651104show ga
Rationale: Pulmonary arterial hypertension (PAH) is a progressive lung disease of the pulmonary microvasculature. Studies suggest that bone marrow (BM)-derived circulating cells may play an important role in its pathogenesis.Objectives: We used a genetic model of PAH, the Bmpr2 mutant mouse, to study the role of BM-derived circulating cells in its pathogenesis.Methods: Recipient mice, either Bmpr2R899X mutant or controls, were lethally irradiated and transplanted with either control or Bmpr2R899X BM cells. Donor cells were traced in female recipient mice by Y chromosome painting. Molecular and function insights were provided by expression and cytokine arrays combined with flow cytometry, colony-forming assays, and competitive transplant assays.Measurements and Main Results: We found that mutant BM cells caused PAH with remodeling and inflammation when transplanted into control mice, whereas control BM cells had a protective effect against the development of disease, when transplanted into mutant mice. Donor BM-derived cells were present in the lungs of recipient mice. Functional and molecular analysis identified mutant BM cell dysfunction suggestive of a PAH phenotype soon after activation of the transgene and long before the development of lung pathology.Conclusions: Our data show that BM cells played a key role in PAH pathogenesis and that the transplanted BM cells were able to drive the lung phenotype in a myeloablative transplant model. Furthermore, the specific cell types involved were derived from hematopoietic stem cells and exhibit dysfunction long before the development of lung pathology.