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Warburg effect is involved in apelin-13-induced human aortic vascular smooth muscle cells proliferation.
Journal of Cellular Physiology 2019 January 32
Apelin is the endogenous ligand for the G protein-coupled receptor APJ. Both apelin and APJ receptor are distributed in vascular smooth muscle cells (VSMCs) and play important roles in the cardiovascular system. Our previous reports have indicated that apelin-13 promoted the proliferation of VSMCs, but its exact mechanism remains to be further explored. The results of the present study demonstrated that the Warburg effect plays a pivotal role in apelin-13-induced human aortic vascular smooth muscle cells (HA-VSMCs) proliferation. Apelin-13 promoted the expression of glucose transporter type 1 (GLUT1), pyruvate kinase 2 (PKM2), lactate dehydrogenase A (LDHA), monocarboxylate transporter 1 (MCT1), and monocarboxylate transporter 4 (MCT4) in a dose- and time-dependent manner. Moreover, apelin-13 increased the extracellular, intracellular lactate level, and decreased adenosine triphosphate level in HA-VSMCs. Furthermore, siRNA-PKM2 reversed extracellular and intracellular lactate generation and inhibited the proliferation of HA-VSMCs induced by apelin-13. Downregulation of LDHA also significantly prevented extracellular and intracellular lactate generation and inhibited the proliferation of HA-VSMCs induced by apelin-13. Taken together, our results demonstrated a novel mechanism for HA-VSMCs proliferation induced by apelin-13 via Warburg effect.
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