Archives of Pharmacal Research

The Pharmaceutical Society of Korea (대한약학회)
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Induction of Cytochrome P45O 1A and 2B by $\alpha$- and ${\beta}-lonone$ in Sprague Dawley Rats

  • Published : 2002.04.01
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Abstract

${\beta}-lonone$ has been reported to induce the cytochrome P45O (P45O) 2B1 in rats. In this study, the effects of ${\beta}-ionone$ and an isomer, ${\alpha}-ionone$, on liver P45O IA and 2B expression in Sprague Dawley rats were investigated . Subcutaneous administration of ${\alpha}-$ and ${\beta}-lonone$ 72 and 48hr prior to sacrificing the animals induced the liver microsomal P45O 1A and 2B proteins. P45O 2Bl induction was associated with the accumulation of its corresponding mRNA. 1 Induction by ${\beta}-lonone$ was much higher than that by ${\alpha}-ionone$-ionone in both the mRNA and protein levels. When the route of administration was compared, P45O 2B was induced more strongly after oral administration compared to that after subcutaneous injection. A single oral dose of 100, 300 and 600 mg/kg of ${\alpha}-$ and ${\beta}-lonone$ for 24 h induced P45O 2B1 -selective pentoxyresorufin Odepentylase activity comparably in a dose-dependent manner In addition, ${\alpha}-$ and ${\beta}-lonone$ induced the P45O 1A and 2B proteins. These results suggest that ${\alpha}-$ and ${\beta}-lonone$ might be potent P45O 2Bl inducers in rats, and that both ionones may be useful for examining the role of metabolic activation in chemical-induced toxicity where metabolic activation is required.

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References

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