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Role of P2X7 Receptor on Hypoxia-Induced Vascular Endothelial Growth Factor Gene Expression in H9c2 Rat Cardiomyocytes

Year: 2025

Type: article

Abstract: Purinergic P2X7 receptors (P2X7Rs) may provide cardioprotection against ischemic heart disease. Cardiac angiogenesis is an endogenous adaptive response of hypoxic cardiomyocytes, mediated by vascular endothelial growth factor (VEGF) via hypoxia-inducible factor-1α (HIF-1α). The study aimed to determine whether P2X7Rs can regulate cardiac pro-angiogenic signaling in hypoxic H9c2 cardiomyocytes by modulating the angiogenic factor VEGF through HIF-1α genes. H9c2 rat cardiomyocytes were exposed to hypoxia alone or in combination with the P2X7R antagonist A740003. Subsequently, ATP levels and LDH activity were measured. The expression of P2X7R, HIF-1α, and VEGF was detected. Intracellular ATP level was significantly lower in hypoxia cardiomyocytes, whereas extracellular ATP, HIF-1α, and LDH levels were significantly higher in hypoxic cardiomyocytes. These effects were associated with increased P2X7R and VEGF gene expressions. Pretreatment with A740003 reversed HIF-1α and VEGF expressions in hypoxic cardiomyocytes. The findings suggest that P2X7Rs regulate pro-angiogenic signaling in hypoxic cardiomyocytes through the HIF-1α/VEGF pathway. Thus, the P2X7R-mediated HIF-1α/VEGF pathway may represent a novel approach to stimulating angiogenesis and preventing heart failure in ischemic heart disease.

Source: Journal of Cardiovascular Development and Disease

DOI: 10.3390/jcdd12110438

Authors: Anfal F. Bin Dayel, Reem M. Alhejji, Asma S. Alonazi, Nouf M. Alrasheed

Institution: King Saud University

Language: English

Topic: Adenosine and Purinergic Signaling

Subfield: Physiology

Field: Biochemistry, Genetics and Molecular Biology

Domain: Life Sciences

SDG: Good health and well-being

Open Access status: gold

Estimated APC paid: $3,258