Abstract
The tissue distributions of four isoforms (CYP2D1/5, 2D2, 2D3 and 2D4/18) in rat CYP2D subfamily were investigated. Twelve kinds of tissue (liver, kidney, brain, lung, heart, spleen, adrenal gland, small intestine mucosa, bladder, testis, ovary and gonecystis) were removed from Sprague–Dawley male and female rats. The expression of CYP2D mRNA in these tissues was detected by RT-PCR. Specific primers were designed to recognize the four isoforms individually. In liver, kidney and small intestine mucosa, the mRNA expression of all four CYP2D isoforms was detected as high-intensity PCR products. mRNA of CYP2D1/5 was expressed in all tissues used in this study except the brain, although the intensity of PCR products varied among tissues. mRNAs of CYP2D2 and CYP2D3 were mainly expressed in liver, kidney and small intestine mucosa, which were exposed to xenobiotics such as drugs, food components and environmental contaminations. mRNA of CYP2D4/18 was expressed in liver, kidney, small intestine mucosa and brain. In brain, only mRNA of CYP2D4/18 was expressed. CYP2D4/18 mRNA was also expressed in ovary, testis and gonecystis. The tissue distributions help to clarify the differences in physiological and pharmacological functions between CYP2D isoforms.
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