Abstract
Hypoxia-induced pulmonary arterial hypertension (HPAH) is a refractory disease characterized by increased proliferation of pulmonary vascular smooth cells and progressive pulmonary vascular remodeling. The level of nitric oxide (NO), a potential therapeutic vasodilator, is low in PAH patients. l-arginine can be converted to either beneficial NO by nitric oxide synthases or to harmful urea by arginase. In the present study, we aimed to investigate whether an arginase inhibitor, S-(2-boronoethyl)-l-cysteine ameliorates HPAH in vivo and vitro. In a HPAH mouse model, we assessed right ventricle systolic pressure (RVSP) by an invasive method, and found that RSVP was elevated under hypoxia, but was attenuated upon arginase inhibition. Human pulmonary artery smooth muscle cells (HPASMCs) were cultured under hypoxic conditions, and their proliferative capacity was determined by cell counting and flow cytometry. The levels of cyclin D1, p27, p-Akt, and p-ERK were detected by RT-PCR or Western blot analysis. Compared to hypoxia group, arginase inhibitor inhibited HPASMCs proliferation and reduced the levels of cyclin D1, p-Akt, p-ERK, while increasing p27 level. Moreover, in mouse models, compared to control group, hypoxia increased cyclin D1 expression but reduced p27 expression, while arginase inhibitor reversed the effects of hypoxia. Taken together, these results suggest that arginase plays an important role in increased proliferation of HPASMCs induced by hypoxia and it is a potential therapeutic target for the treatment of pulmonary hypertensive disorders.
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Change history
02 September 2023
This article has been retracted. Please see the Retraction Notice for more detail: https://doi.org/10.1007/s11010-023-04846-5
Abbreviations
- HPAH:
-
Hypoxia-induced pulmonary arterial hypertension
- NO:
-
Nitric oxide
- NOS:
-
Nitric oxide synthases
- RVSP:
-
Right ventricle systolic pressure
- HPASMCs:
-
Human pulmonary artery smooth muscle cells
- PAH:
-
Pulmonary arterial hypertension
- VSMCs:
-
Vascular smooth muscle cells
- BEC:
-
S-(2-boronoethyl)-l-cysteine
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Acknowledgments
This study was supported by the fund from Projects of technology development program in Shandong Province, P R China (No. 2014GSF121015) and Projects of medical and health technology development program in Shandong Province (No. 2014WS0343).
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Chu, Y., XiangLi, X., Niu, H. et al. RETRACTED ARTICLE: Arginase inhibitor attenuates pulmonary artery hypertension induced by hypoxia. Mol Cell Biochem 412, 91–99 (2016). https://doi.org/10.1007/s11010-015-2611-z
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DOI: https://doi.org/10.1007/s11010-015-2611-z