title: Secreted frizzled related protein 1 protects H9C2 cells from hypoxia/re-oxygenation injury by blocking the Wnt signaling pathway.
abstract: BACKGROUND
  In animal models, secreted frizzled related protein 1 (Sfrp1) inhibition of the Wnt signaling pathway is beneficial because Sfrp1 reduces myocardial apoptosis and prevents heart failure. The mechanisms mediating the cellular survival effect of Sfrp1 has not been completely elucidated. The present study was designed to investigate the possible protective actions of Sfrp1 on cardiac muscle cells using an in vitro model of ischemia/reperfusion, and to evaluate the possible involvement of the Wnt signaling pathway.
  
  
  METHODS
  We used a recombinant AAV9 vector to deliver the Sfrp1 gene into H9C2 rat cardiomyoblasts and adopted an in vitro model of ischemia/reperfusion. Cell vitality was measured by CKK-8 and the trypan blue exclusion assay. Western blot was used to evaluate the expression of Dvl-1, β-catenin, c-Myc, Bax, and Bcl-2. Flow cytometry analysis of cardiomyocyte apoptosis was performed.
  
  
  RESULTS
  We confirmed that Sfrp1 significantly increased cell viability (assayed by trypan blue and CKK-8) and decreased apoptosis (assayed by flow cytometry analysis and the Bax/Bcl-2 ratio). These effects were partly attributable to the ability of Sfrp1 to down-regulate Wnt signaling pathway (assayed by Western blot to evaluate the expression of Dvl-1, β-catenin, and c-Myc). Indeed, reactivation of the Wnt signaling pathway activity with the specific activator, Licl, reduced Sfrp1-induced cardioprotection during hypoxia and reoxygenation.
  
  
  CONCLUSIONS
  The present study demonstrated that Sfrp1 directly protected H9C2 cells from hypoxia and reoxygenation-induced reperfusion injury and apoptosis through inhibition of the Wnt signaling pathway, and added new mechanistic insight regarding the cardioprotective role of Sfrp1 on ischemic damage.
authors.affiliation: Department of Cardiology, the First Affiliated Hospital of Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.|Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Tao
authors.affiliation: Department of Cardiology, the First Affiliated Hospital of Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.|Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.
authors.forename: Mayila
authors.initials: M
authors.lastname: Abudoukelimu
authors.affiliation: Department of Cardiology, the First Affiliated Hospital of Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China. 115143373@qq.com.|Xinjiang Key Laboratory of Cardiovascular Disease Research, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China. 115143373@qq.com.|Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China. 115143373@qq.com.
authors.forename: Yi-tong
authors.initials: YT
authors.lastname: Ma
authors.affiliation: Department of Cardiology, the First Affiliated Hospital of Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.
authors.forename: Yi-ning
authors.initials: YN
authors.lastname: Yang
authors.affiliation: Department of Cardiology, the First Affiliated Hospital of Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.
authors.forename: Xiao-mei
authors.initials: XM
authors.lastname: Li
authors.affiliation: Xinjiang Key Laboratory of Cardiovascular Disease Research, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.
authors.forename: Bang-dang
authors.initials: BD
authors.lastname: Chen
authors.affiliation: Xinjiang Key Laboratory of Cardiovascular Disease Research, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.
authors.forename: Fen
authors.initials: F
authors.lastname: Liu
authors.affiliation: Department of Cardiology, the First Affiliated Hospital of Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.|Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.
authors.forename: Chun-hui
authors.initials: CH
authors.lastname: He
authors.affiliation: Department of Cardiology, the First Affiliated Hospital of Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.|Xinjiang Medical University, Li Yu Shan South Road 137, Urumqi, 830001, People's Republic of China.
authors.forename: Hua-yin
authors.initials: HY
authors.lastname: Li
mesh_terms: D000818:Animals; D017209:Apoptosis; D015687:Cell Hypoxia / Q000502:physiology; D002460:Cell Line; D002470:Cell Survival; D005786:Gene Expression Regulation; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism*; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D015428:Myocardial Reperfusion Injury / Q000378:metabolism; D009206:Myocardium / Q000166:cytology / Q000378:metabolism* / Q000473:pathology; D051381:Rats; D060449:Wnt Signaling Pathway; D051028:bcl-2-Associated X Protein / Q000378:metabolism; D051176:beta Catenin / Q000378:metabolism; D000094742:Secreted Frizzled-Related Proteins
chemical_list: D036341:Intercellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D051028:bcl-2-Associated X Protein; D051176:beta Catenin; C494828:Bax protein, rat; C495268:Ctnnb1 protein, rat; C500646:Sfrp1 protein, rat; D000094742:Secreted Frizzled-Related Proteins
keywords: Apoptosis; H9C2; Hypoxia reoxygenation injury; Sfrp1; Wnt signaling pathway