scholarly journals Endogenous Estrogen Attenuates Hypoxia-Induced Pulmonary Hypertension by Inhibiting Pulmonary Arterial Vasoconstriction and Pulmonary Arterial Smooth Muscle Cells Proliferation

2013 ◽  
Vol 10 (6) ◽  
pp. 771-781 ◽  
Author(s):  
Dunquan Xu ◽  
Wen Niu ◽  
Ying Luo ◽  
Bo Zhang ◽  
Manling Liu ◽  
...  
Keyword(s):  
Pulmonary Hypertension ◽  
Smooth Muscle ◽  
Smooth Muscle Cells ◽  
Muscle Cells ◽  
Arterial Smooth Muscle ◽  
Endogenous Estrogen ◽  
Pulmonary Arterial ◽  
Arterial Smooth Muscle Cells ◽  
Pulmonary Arterial Smooth Muscle

scholarly journals Circular RNA Calm4 Regulates Hypoxia-Induced Pulmonary Arterial Smooth Muscle Cells Pyroptosis via the Circ-Calm4/miR-124-3p/PDCD6 Axis

2021 ◽  
Author(s):  
Yuan Jiang ◽  
Huiyu Liu ◽  
Hang Yu ◽  
Yang Zhou ◽  
Junting Zhang ◽  
...  
Keyword(s):  
Pulmonary Hypertension ◽  
Smooth Muscle ◽  
Smooth Muscle Cells ◽  
Muscle Cells ◽  
Circular Rna ◽  
Circular Rnas ◽  
Arterial Smooth Muscle ◽  
Pulmonary Arterial ◽  
Arterial Smooth Muscle Cells ◽  
Pulmonary Arterial Smooth Muscle

Objective: Circular RNAs are emerging as important regulators of pulmonary hypertension where pyroptosis plays a critical role. However, whether and how the circular RNAs regulate pyroptosis remained unexplored. Here, we show evidence for the involvement of a specific circular RNA known as circ-Calm4 in pulmonary hypertension and the underlying signaling pathway in pyroptosis. Approach and Results: Circ-Calm4 was upregulated in both mouse model of pulmonary hypertension in vivo and cultured smooth muscle cells in vitro. We performed immunoblotting, quantitative real-time PCR, LDH (lactate dehydrogenase) release assay, Annexin V-FITC/propidium iodide double staining, Hoechst 33342/propidium iodide fluorescence staining, and immunostaining to clarify the roles of circ-Calm4 in pulmonary arterial smooth muscle cell pyroptosis. Silencing the circ-Calm4 with its small-interfering RNA mitigated the upregulation of pyroptosis related phenotypes induced by hypoxia. Luciferase reporter assays confirmed that miR-124-3p suppressed the luciferase activity of the circ-Calm4 and RNA fluorescence in situ hybridization showed the colocalization of circ-Calm4 and miR-124-3p. The circ-Calm4 was found to act as a competitive endogenous RNA to regulate miR-124-3p. The pyroptosis-related alterations were all diminished with miR-124-3p in hypoxic pulmonary arterial smooth muscle cells. Inhibition of the gene targeted by miR-124-3p encoding the Pdcd6 (programmed cell death protein 6) abrogated pyroptosis-related phenotypes under hypoxia stimulation. Conclusions: Our findings show a new signaling pathway, the circ-Calm4/miR-124-3p/ Pdcd6 axis was demonstrated in regulation of hypoxia-induced pyroptosis, which may potentially be useful for the design of therapeutic strategies for protecting the cellular functionality against pyroptosis as well as pulmonary hypertension.

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