4.7 Article

Congestive heart failure in COX2 deficient rats

Journal

SCIENCE CHINA-LIFE SCIENCES
Volume 64, Issue 7, Pages 1068-1076

Publisher

SCIENCE PRESS
DOI: 10.1007/s11427-020-1792-5

Keywords

NSAID; cyclooxygenase; prostaglandin; heart failure; energy metabolism

Categories

Funding

  1. National Natural Science Foundation of China [81790623, 81525004]
  2. Chinese Ministry of Science and Technology [2017YFC1307404, 2017YFC1307402]
  3. Collaborative Innovation Center of Model Animal, Wuhan University

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This study using COX1- and COX2-deficient rat models demonstrates that COX2 deficiency leads to heart failure, myocardial fibrosis, and abnormal cardiac energy metabolism.
Non-steroidal anti-inflammatory drugs (NSAIDs) inhibit prostaglandin (PG) formation by targeting cyclooxygenase (COX) 1 and 2. Long-term use of NSAIDs that selectively inhibit COX2 increases the risk for thrombotic events, cardiac failure, and hypertension. However, the underlying mechanisms remain unclear. In this study, COX1- and COX2-deficient rats were created via Cas9/RNA-mediated gene targeting. DNA genotyping and Western blot analysis confirmed successful generation of COX1(-/-)and COX2(-/-)rats. Adult COX1(-/-)rats grew normally, while more than 70% of COX2(-/-)rats after wean died within 2 months. Echocardiography showed markedly reduced left ventricular ejection fraction and fractional shortening in adult COX2(-/-)rats compared to those in wildtype (WT) controls. Histological analysis revealed accumulation of inflammatory cells and severe interstitial and perivascular fibrosis in COX2(-/-)cardiac tissues. Moreover, cardiac ATP and acetyl-CoA production was dramatically decreased in COX2(-/-)rats. Consistently, the expression of genes related to mitochondrial oxidation, such as those that encode for subunits of pyruvate dehydrogenase complex and acyl CoA dehydrogenases, were downregulated, while glycolytic hexokinase 1 (HK1) was upregulated in COX2(-/-)heart tissues. These observations indicate that COX2-deficient rats developed spontaneously heart failure, likely as a result of dysregulated cardiac energy metabolism.

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