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Molecular and Cellular Biochemistry

, Volume 366, Issue 1–2, pp 345–354 | Cite as

Increased expression of calcium-sensing receptors in atherosclerosis confers hypersensitivity to acute myocardial infarction in rats

  • Jin Guo
  • Hong-zhu Li
  • Lu-chuan Wang
  • Wei-hua Zhang
  • Guang-wei Li
  • Wen-jing Xing
  • Rui Wang
  • Chang-qing Xu
Article

Abstract

Acute myocardial infarction (AMI) is a leading cause of death worldwide. Most cases of AMI result from coronary atherosclerosis (AS). The pathogenic mechanisms underlying AS lesions and AMI are incompletely understood. Calcium-sensing receptors (CaSR) belong to a family of G-protein-coupled receptors. We previously discovered that CaSR was expressed in the heart tissue of adult rats. CaSR may contribute to AMI in AS. We initially established a rat model of AS by injection of vitamin D3 and feeding with a high-fat diet. Isoproterenol (ISO) was used to induce AMI. The MB isoenzyme of creatine kinase (CK-MB), lactate dehydrogenase (LDH), cardiac troponin T (cTnT), tetrazolium chloride staining, and cardiac function parameters were selected as indicators of myocardial damage or necrosis. Cardiac apoptosis was analyzed by transferase dUTP nick-end labeling (TUNEL) assay. Expression of CaSR, Bcl-2, Bax, caspase-3, p-ERK1/2, p-JNK, and p-p38 were determined by Western blot analysis. Compared with the control group, levels of cTnT, CK-MB, and LDH; number of TUNEL-positive cells; and expression of CaSR, Bax, caspase-3, p-ERK1/2, p-JNK and p-p38, were significantly increased, whereas cardiac function and expression of Bcl-2 were decreased markedly in isoproterenol (ISO)-treated group (C/ISO) and AS groups. These changes were significant in the AS/ISO group than in the C/ISO group or AS group. The upregulation of CaSR during AS formation renders hypersensitivity to AMI. Activation of the pro-apoptotic mitochondria pathway and JNK-p38 MAPK pathway triggered by increased expression of CaSR may be one of molecular mechanisms underlying AMI in AS.

Keywords

Acute myocardial infarction (AMI) Atherosclerosis (AS) Apoptosis Calcium sensing receptors (CaSR) 

Notes

Acknowledgments

This work was supported by the National Basic Research Program of China (973 Program, grant number 2007CB512000); National Natural Science Foundation of China (number 30871012,81000059 and 30700288); Youth Fund of Jiamusi University (number Sq2011-025).

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Copyright information

© Springer Science+Business Media, LLC. 2012

Authors and Affiliations

  • Jin Guo
    • 1
    • 3
  • Hong-zhu Li
    • 1
  • Lu-chuan Wang
    • 4
  • Wei-hua Zhang
    • 1
    • 2
  • Guang-wei Li
    • 1
  • Wen-jing Xing
    • 1
  • Rui Wang
    • 1
    • 5
  • Chang-qing Xu
    • 1
    • 2
  1. 1.Department of PathophysiologyHarbin Medical UniversityHarbinChina
  2. 2.Key Laboratory of Cardiovascular Medicine Research (Harbin Medical University), Ministry of EducationHarbinChina
  3. 3.Department of Cerebral PalsyTertiary Hospital of Jiamusi UniversityJiamusiChina
  4. 4.Department of OrthopaedicsFirst Hospital of Jiamusi UniversityJiamusiChina
  5. 5.Department of BiologyLakehead UniversityThunder BayCanada

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