Cardioprotective effects of telmisartan against heart failure in rats induced by experimental autoimmune myocarditis through the modulation of angiotensin-converting enzyme-2/angiotensin 1-7/mas receptor axis

Int J Biol Sci. 2011;7(8):1077-92. doi: 10.7150/ijbs.7.1077. Epub 2011 Sep 8.


Angiotensin-converting enzyme-2 (ACE-2) is a homolog of ACE that preferentially forms angiotensin-(ANG)-1-7 from angiotensin II (ANG II). We investigated the cardioprotective effects of telmisartan, a well-known angiotensin receptor blockers (ARBs) against experimental autoimmune myocarditis (EAM). EAM was induced in Lewis rats by immunization with porcine cardiac myosin. The rats were divided into two groups and treated with telmisartan (10 mg/kg/day) or vehicle for 21 days. Myocardial functional parameters were significantly improved by treatment with telmisartan compared with vehicle-treated rats. Telmisartan lowered myocardial protein expressions of NADPH oxidase subunits 3-nitrotyrosine, p47phox, p67 phox, Nox-4 and superoxide production significantly than vehicle-treated rats. In contrast myocardial protein levels of ACE-2, ANG 1-7 mas receptor were upregulated in the telmisartan treated group compared with those of vehicle-treated rats. The myocardial protein expression levels of tumor necrosis factor receptor (TNFR)-associated factor (TRAF)-2, C/EBP homologous protein (CHOP) and glucose-regulated protein (GRP) 78 were decreased in the telmisartan treated rats compared with those of vehicle-treated rats. In addition, telmisartan treatment significantly decreased the protein expression levels of phospho-p38 mitogen-activated protein kinase (MAPK), phospho-JNK, phospho-ERK and phospho (MAPK) activated protein kinase-2 than with those of vehicle-treated rats. Moreover, telmisartan significantly decreased the production of proinflammatory cytokines, myocardial apoptotic markers and caspase-3 positive cells compared with those of vehicle-treated rats. Therefore, we suggest that telmisartan was beneficial protection against heart failure in rats, at least in part by suppressing inflammation, oxidative stress, ER stress as well as signaling pathways through the modulation of ACE2/ANG1-7/Mas receptor axis.

Keywords: Experimental autoimmune myocarditis; endoplasmic reticulum stress; inflammation; oxidative stress; signaling pathways; telmisartan.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Angiotensin I / metabolism*
  • Angiotensin II Type 1 Receptor Blockers / therapeutic use*
  • Angiotensin-Converting Enzyme 2
  • Animals
  • Apoptosis
  • Benzimidazoles / pharmacology
  • Benzimidazoles / therapeutic use*
  • Benzoates / pharmacology
  • Benzoates / therapeutic use*
  • Biomarkers / metabolism
  • Cytokines / metabolism
  • Disease Models, Animal
  • Endoplasmic Reticulum / drug effects
  • Heart Failure / immunology
  • Heart Failure / prevention & control*
  • Male
  • Mitogen-Activated Protein Kinases / metabolism
  • Myocarditis / drug therapy*
  • Myocarditis / immunology
  • Myocarditis / pathology
  • NADPH Oxidases / metabolism
  • Oxidative Stress / drug effects
  • Peptide Fragments / metabolism*
  • Peptidyl-Dipeptidase A / metabolism*
  • Protective Agents / therapeutic use*
  • Protein Subunits / metabolism
  • Rats
  • Signal Transduction / drug effects
  • Superoxides / metabolism
  • Telmisartan


  • Angiotensin II Type 1 Receptor Blockers
  • Benzimidazoles
  • Benzoates
  • Biomarkers
  • Cytokines
  • Peptide Fragments
  • Protective Agents
  • Protein Subunits
  • Superoxides
  • Angiotensin I
  • NADPH Oxidases
  • Mitogen-Activated Protein Kinases
  • Peptidyl-Dipeptidase A
  • Ace2 protein, rat
  • Angiotensin-Converting Enzyme 2
  • angiotensin I (1-7)
  • Telmisartan