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The potency to accumulate triglyceride (TG) was compared between perfluorinated fatty acids (PFCAs) with different carbon chain lengths in the liver of male and female rats and induction of peroxisomal beta-oxidation. In male rats, either perfluoroheptanoic acid (C7) or perfluorooctanoic acid (C8) had no effect, although perfluorononanonic acid (C9) and perfluorodecanoic acid (C10) markedly accumulated TG. In female rats, C7, C8, and C9 did not cause TG accumulation, whereas C10 caused TG accumulation at the same level as in male rats. TG accumulation induced by C9 was regulated by the level of testosterone in male rats. In contrast with TG accumulation, peroxisomal beta-oxidation was induced by C8, C9, and C10 in male rats and by C9 and C10 in female rats. Only a slight difference was observed in the induction by C9 between male and female rats. The induction of TG accumulation by these PFCAs occurred in a dose-dependent manner and significantly correlated with hepatic concentrations of PFCA regardless of their carbon chain length, as was observed with induction of peroxisomal beta-oxidation. There is, however, a striking difference in the hepatic concentration of PFCA required to cause induction of TG accumulation and that of peroxisomal beta-oxidation. The concentration of PFCA required to induce TG accumulation is much higher than that to induce peroxisomal beta-oxidation. These results strongly suggest that TG accumulation induced by PFCAs, as well as the induction of peroxisomal beta-oxidation, is dependent only on the number of PFCA molecules in hepatocytes, but is not due to the difference in their chemical structures, and that there is a marked difference in the PFCA threshold to cause distinct biological effects.

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Induction of Triglyceride Accumulation in the Liver of Rats by Perfluorinated Fatty Acids with Different Carbon Chain Lengths: Comparison with Induction of Peroxisomal .BETA.-Oxidation.