title: RNA interference targeting SHP-1 attenuates myocardial infarction in rats.
abstract: The Src homology domain 2 (SH2)-containing tyrosine phosphatase-1 (SHP-1) plays a key role in apoptosis and decreases phosphorylation of Akt. Apoptosis of cardiomyocytes is thought to contribute to the increased area of acute myocardial infarction (AMI), and Akt activation exerts a powerful cardioprotective effect after ischemia. Thus, a therapeutic strategy designed to inhibit expression of SHP-1 would be beneficial in AMI. Here we report that siRNA targeting SHP-1 reduced infarct size in a rat model of AMI. Upon injection into the ischemic left ventricular wall, the vector-based siRNA significantly suppressed the increase in the SHP-1 mRNA and the SHP-1 protein levels. The siRNA vector also significantly reduced the SHP-1 that bound to Fas-R. The SHP-1 siRNA vector increased phospho-Akt and reduced DNA fragmentation and caspase activity compared with the scramble siRNA vector. Finally, the area of myocardial infarction was significantly smaller with the SHP-1 siRNA vector than with the scramble siRNA vector at 2 days after LCA ligation. In conclusion, SHP-1 in the heart increased from the early stage of AMI, and this increase was thought to contribute to the increased area of myocardial infarction. Suppression of SHP-1 with the SHP-1 siRNA vector markedly reduced the infarct size in AMI.
authors.affiliation: Department of Molecular and Cellular Biology, Division of Molecular and Clinical Gerontology, Medical Institute of Bioregulation, Kyushu University, Beppu, Oita, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Sugano
authors.forename: Keiko
authors.initials: K
authors.lastname: Tsuchida
authors.forename: Tomoji
authors.initials: T
authors.lastname: Hata
authors.forename: Naoki
authors.initials: N
authors.lastname: Makino
mesh_terms: D000818:Animals; D017209:Apoptosis; D015152:Blotting, Northern; D015153:Blotting, Western; D020169:Caspases / Q000378:metabolism; D003331:Coronary Vessels / Q000473:pathology; D053938:DNA Fragmentation; D004452:Echocardiography; D015316:Genetic Therapy; D005822:Genetic Vectors; D006352:Heart Ventricles; D047468:Immunoprecipitation; D047908:Intracellular Signaling Peptides and Proteins / Q000502:physiology*; D008297:Male; D008954:Models, Biological; D009203:Myocardial Infarction / Q000378:metabolism*; D017202:Myocardial Ischemia; D009206:Myocardium / Q000473:pathology*; D032383:Myocytes, Cardiac / Q000473:pathology*; D054645:Protein Phosphatase 1; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases / Q000502:physiology*; D034622:RNA Interference; D012333:RNA, Messenger / Q000378:metabolism; D034741:RNA, Small Interfering / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D013997:Time Factors; D019014:fas Receptor / Q000378:metabolism; D018909:src Homology Domains
chemical_list: D047908:Intracellular Signaling Peptides and Proteins; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D019014:fas Receptor; D054645:Protein Phosphatase 1; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases; C509250:Ptpn6 protein, rat; D020169:Caspases