title: Cardioprotection by ischemic postconditioning is lost in aged and STAT3-deficient mice.
abstract: The cardioprotection by ischemic preconditioning is lost in aged wild-type and in STAT3 (signal transducer and activator of transcription 3)-deficient mice. The aim of the present study was to analyze whether or not ischemic postconditioning (iPoco) was effective in aged mice hearts and whether iPoco was dependent on STAT3. Young (3 months) and aged (>13 months) C57Bl6/J mice underwent 30 minutes of ischemia and 2 hours of reperfusion without or with iPoco (3 cycles of 10 seconds of ischemia/10 seconds of reperfusion [3x10] or 5 cycles of 5 seconds of ischemia/5 seconds of reperfusion [5x5] at the beginning of reperfusion). In young mice, both iPoco3x10 and iPoco5x5 reduced infarct size (IS), whereas in aged mice, only iPoco5x5 was effective in reducing IS. In young mice, iPoco3x10 increased the phosphorylated over total STAT3 (phosphorylated STAT3/STAT3) ratio at 10 minutes of reperfusion in the postconditioned anterior wall compared with the control posterior wall. In aged mice hearts, total STAT3 and phosphorylated STAT3/STAT3 in the anterior wall at reperfusion were reduced compared with young mice hearts. In young mice hearts subjected to iPoco3x10 but pretreated with the JAK-2 inhibitor AG-490, phosphorylated STAT3/STAT3 was reduced in the anterior wall compared with untreated young mice hearts, and IS reduction by iPoco3x10 was abolished. Furthermore, in young mice with a cardiomyocyte-restricted deletion of STAT3, iPoco3x10 failed to reduce IS, whereas iPoco5x5 reduced IS. Thus, cardioprotection by iPoco is dependent on the postconditioning protocol in aged and STAT3-deficient hearts. The reduced levels of STAT3 with increasing age may contribute to the age-related loss of iPoco.
authors.affiliation: Institut für Pathophysiologie, Universitätsklinikum Essen, Hufelandstr. 55, 45122 Essen, Germany.
authors.forename: Kerstin
authors.initials: K
authors.lastname: Boengler
authors.forename: Astrid
authors.initials: A
authors.lastname: Buechert
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Heinen
authors.forename: Christin
authors.initials: C
authors.lastname: Roeskes
authors.forename: Denise
authors.initials: D
authors.lastname: Hilfiker-Kleiner
authors.forename: Gerd
authors.initials: G
authors.lastname: Heusch
authors.forename: Rainer
authors.initials: R
authors.lastname: Schulz
mesh_terms: D000367:Age Factors; D000818:Animals; D019157:Ischemic Preconditioning, Myocardial; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009203:Myocardial Infarction / Q000628:therapy; D017202:Myocardial Ischemia; D015425:Myocardial Reperfusion; D010766:Phosphorylation; D050796:STAT3 Transcription Factor / Q000172:deficiency* / Q000378:metabolism / Q000502:physiology
chemical_list: D050796:STAT3 Transcription Factor; C494087:Stat3 protein, mouse