Ischemic preconditioning accelerates the fatty acid oxidation of rat hearts.
BACKGROUND
Ischemic preconditioning (IPC) reduced myocardial ATP depletion during sustained ischemia and has a powerful protective effect on the myocardium. The purpose of the present study was to clarify the effects of IPC on myocardial accumulation of fatty acid (FA) tracer and its intracellular metabolism.


METHODS
Myocardial ischemia-reperfusion (MI-R) injury was induced by the left coronary artery ligation for 15 min followed by reperfusion in Wistar rats. IPC was achieved with a single cycle of 5-minute coronary ligation followed by 5-minute reperfusion before MI-R. Three days after ischemia-reperfusion, FA metabolism was evaluated in rats with or without IPC using (131)I- and (125)I-15-(p-iodophenyl)-9-methylpentadecanoic acid (9MPA) and thin-layer chromatography.


RESULTS
IPC attenuated a reduction of 9MPA accumulation in ischemic region (IR). The metabolite fraction of 9MPA including both early and late metabolites was less in IR as compared to non-IR in rats without IPC. IPC increased the final metabolic product of 9MPA processed via alpha- and beta-oxidation in both IR and non-IR.


CONCLUSIONS
IPC accelerated fatty acid oxidation in both IR and non-IR. This alteration in fatty acid metabolism would inhibit an intracellular accumulation of detrimental fatty acid metabolites.
Matsuki
Akira
A
The Second Department of Internal Medicine, Graduate School of Medicine, University of Toyama, Sugitani, Toyama, Japan.
Nozawa
Takashi
T
Igawa
Akihiko
A
Igarashi
Norio
N
Nakadate
Teruo
T
Fujii
Nozomu
N
Inoue
Hiroshi
H
D000255:Adenosine Triphosphate / Q000378:metabolism*; D000818:Animals; D001345:Autoradiography; D002855:Chromatography, Thin Layer; D005227:Fatty Acids / Q000378:metabolism*; D007091:Image Processing, Computer-Assisted; D007462:Iodobenzenes / Q000378:metabolism*; D019157:Ischemic Preconditioning, Myocardial; D009206:Myocardium / Q000378:metabolism*; D010084:Oxidation-Reduction; D051381:Rats; D017208:Rats, Wistar
D005227:Fatty Acids; D007462:Iodobenzenes; D000255:Adenosine Triphosphate; C067799:4-iodophenyl-9-methylpentadecanoic acid