Loss of cAbl Tyrosine Kinase in Pulmonary Arterial Hypertension Causes Dysfunction of Vascular Endothelial Cells.
Am J Respir Cell Mol Biol
; 67(2): 215-226, 2022 08.
Article
em En
| MEDLINE
| ID: mdl-35550008
ABSTRACT
Pulmonary arterial hypertension (PAH) is a progressive and fatal disease characterized by the dysfunction of pulmonary endothelial cells (ECs) and obstructive vascular remodeling. cAbl (non-receptor tyrosine kinase c-Abelson) plays central roles in regulating cell-cycle arrest, apoptosis, and senescence after cellular stress. We hypothesized that cAbl is downactivated in experimental and human PAH, thus leading to reduced DNA integrity and angiogenic capacity of pulmonary ECs from patients with PAH (PAH-ECs). We found cAbl and phosphorylated cAbl concentrations to be lower in the endothelium of remodeled pulmonary vessels in the lungs of patients with PAH than in control subjects. Similar observations were obtained for the lungs of Sugen + hypoxia and monocrotaline rats with established pulmonary hypertension. These in situ abnormalities were also replicated in vitro, with cultured PAH-ECs displaying lower cAbl expression and activity and an altered DNA damage response and capacity of tube formation. Downregulation of cAbl by RNA interference in control ECs or its inhibition with dasatinib resulted in genomic instability and the failure to form tubes, whereas upregulation of cAbl with 5-(1,3-diaryl-1H-pyrazol-4-yl) hydantoin reduced DNA damage and apoptosis in PAH-ECs. Finally, we establish the existence of cross-talk between cAbl and bone morphogenetic protein receptor type II. This work identifies the loss of cAbl signaling as a novel contributor to pulmonary EC dysfunction associated with PAH.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Células Endoteliais
/
Hipertensão Arterial Pulmonar
Tipo de estudo:
Etiology_studies
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Am J Respir Cell Mol Biol
Ano de publicação:
2022
Tipo de documento:
Article