Comparison of 11C and 14C-labeled fatty acids and their beta-methyl analogs.
1-[14C] beta-methylheptadecanoic acid ( [14C]BMHDA) was compared to 16-[14C]palmitic [( 14C]PA) acid for its biodistribution in rats, to determine whether an analogue designed to be trapped as a metabolite of the beta-oxidation metabolic process in the myocardium could be used to assess myocardial metabolic integrity. A heart concentration of 2.82 and 6.18% I.D./g at 5 and 60 min was observed for [14C]BMHDA, while [14C]palmitic acid was 2.65 and 0.89% I.D./g at 5 and 60 min respectively. However the myocardial concentration at 24 h was 0.4% I.D./g, indicating clearance of the tracer from the heart. Quantitative autoradiographic studies confirmed the highest heart concentration of [14C]BMHDA at 60 min, compared to other organs.
D000818:Animals; D001345:Autoradiography; D002250:Carbon Radioisotopes; D005227:Fatty Acids / Q000378:metabolism; D006321:Heart / Q000000981:diagnostic imaging*; D008297:Male; D009203:Myocardial Infarction / Q000473:pathology; D009206:Myocardium / Q000378:metabolism; D010169:Palmitic Acids / Q000378:metabolism; D051381:Rats; D011916:Rats, Inbred F344; D011919:Rats, Inbred Strains; D014018:Tissue Distribution; D014055:Tomography, Emission-Computed
D002250:Carbon Radioisotopes; D005227:Fatty Acids; D010169:Palmitic Acids; C033637:3-methylheptadecanoic acid