期刊
CELL PROLIFERATION
卷 53, 期 2, 页码 -出版社
WILEY
DOI: 10.1111/cpr.12742
关键词
cyclin A2; Janus kinase 2; pulmonary arterial hypertension; pulmonary artery smooth muscle cell; signal transducer and activator of transcription 3
类别
资金
- Ministry of Science and Technology [2016YFC1305002, 2017YFC1309603]
- National Natural Science Foundation of China [81530024, 81670729, 81770823, 81920108009, 91749207]
- NHC Drug Discovery Program [2017ZX09304022-07]
- Department of Science and Technology of Hubei Province [2017ACA096]
- Integrated Innovative Team for Major Human Disease Programs of Tongji Medical College
- Huazhong University of Science and Technology
- Innovative Funding for Translational Research from Tongji Hospital
Objectives Hypoxia is an important risk factor for pulmonary arterial remodelling in pulmonary arterial hypertension (PAH), and the Janus kinase 2 (JAK2) is believed to be involved in this process. In the present report, we aimed to investigate the role of JAK2 in vascular smooth muscle cells during the course of PAH. Methods Smooth muscle cell (SMC)-specific Jak2 deficient mice and their littermate controls were subjected to normobaric normoxic or hypoxic (10% O-2) challenges for 28 days to monitor the development of PAH, respectively. To further elucidate the potential mechanisms whereby JAK2 influences pulmonary vascular remodelling, a selective JAK2 inhibitor was applied to pre-treat human pulmonary arterial smooth muscle cells (HPASMCs) for 1 hour followed by 24-hour hypoxic exposure. Results Mice with hypoxia-induced PAH were characterized by the altered JAK2/STAT3 activity in pulmonary artery smooth muscle cells. Therefore, induction of Jak2 deficiency in SMCs protected mice from hypoxia-induced increase of right ventricular systolic pressure (RVSP), right ventricular hypertrophy and pulmonary vascular remodelling. Particularly, loss of Jak2 significantly attenuated chronic hypoxia-induced PASMC proliferation in the lungs. Similarly, blockade of JAK2 by its inhibitor, TG-101348, suppressed hypoxia-induced human PASMC proliferation. Upon hypoxia-induced activation, JAK2 phosphorylated signal transducer and activator of transcription 3 (STAT3), which then bound to the CCNA2 promoter to transcribe cyclin A2 expression, thereby promoting PASMC proliferation. Conclusions Our studies support that JAK2 could be a culprit contributing to the pulmonary vascular remodelling, and therefore, it could be a viable target for prevention and treatment of PAH in clinical settings.
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