2. Academic Validation
  3. Activation of the Vascular Smooth Muscle GLP-1/NCX1 Pathway Regulates Cytoplasmic Ca2+ Homeostasis and Improves Blood Pressure Variability in Hypertension

Activation of the Vascular Smooth Muscle GLP-1/NCX1 Pathway Regulates Cytoplasmic Ca2+ Homeostasis and Improves Blood Pressure Variability in Hypertension

  • Gerontology. 2023 Mar 7;1-12. doi: 10.1159/000527675.
Yi Xu 1,  Chuan Chen 2,  Yanpeng Yang 2,  Shanmu Ai 3,  Wei Ao 4,  Lingwen Kong 5,  Ying Zhang 2,  Jun Li 2,  Jun Xiao 2
Affiliations

Affiliations

  • 1 Department of Cardiovascular Medicine, Chongqing Emergency Medical Center, Chongqing University Central Hospital, Chongqing, China, [email protected].
  • 2 Department of Cardiovascular Medicine, Chongqing Emergency Medical Center, Chongqing University Central Hospital, Chongqing, China.
  • 3 Emergency Department, Chongqing Emergency Medical Center, Chongqing University Central Hospital, Chongqing, China.
  • 4 Department of Information, Chongqing Emergency Medical Center, Chongqing University Central Hospital, Chongqing, China.
  • 5 Department of Cardiothoracic Surgery, Chongqing Emergency Medical Center, Chongqing University Central Hospital, Chongqing, China.
PMID: 36882028 DOI: 10.1159/000527675
Abstract

Background: Hypertension is the most common Cardiovascular Disease, and its main harmful effect is chronic damage to target organs. In some patients with well-controlled blood pressure, target organ damage still occurs. GLP-1 agonists have significant cardiovascular benefits, but their antihypertensive effect is limited. The cardiovascular protective effect of GLP-1 is worth studying.

Methods: The ambulatory blood pressure of spontaneously hypertensive rats (SHRs) was detected by ambulatory blood pressure monitoring, and the characteristics of blood pressure and the effect of subcutaneous intervention with a GLP-1R agonist on blood pressure were observed. To explore the mechanism of the cardiovascular benefit of GLP-1R agonists in SHRs, we evaluated the effects of GLP-1R agonists on vasomotor function and calcium homeostasis in vascular smooth muscle cells (VSMCs) in vitro.

Results: Although the blood pressure of SHRs was significantly higher than that of WKY rats, the blood pressure variability of SHRs was also significantly higher than that of the control group. The GLP-1R agonist significantly reduced blood pressure variability in SHRs, but the antihypertensive effect was not obvious. GLP-1R agonists can significantly improve the cytoplasmic calcium overload of VSMCs in SHRs by upregulating the expression of NCX1, improving the systolic and diastolic functions of arterioles, and reducing blood pressure variability.

Conclusions: Taken together, these results provide evidence that GLP-1R agonists improved VSMC cytoplasmic Ca2+ homeostasis through upregulated NCX1 expression in SHRs, which plays a key role in blood pressure stability and broad cardiovascular benefits.

Keywords

Blood pressure variability; Cytoplasmic Ca2+ homeostasis; GLP-1R agonist; NCX1.

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