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- W2055387123 abstract "Epinephrine-producing cells are characterized by the presence of phenylethanolamine N-methyltransferase (PNMT), which catalyzes the formation of epinephrine from norepinephrine. We generated a line of transgenic mice carrying a chimeric gene containing human PNMT cDNA fused to the 4-kilobase fragment of the human dopamine beta-hydroxylase (DBH) gene promoter, to switch catecholamine phenotype in the nervous and endocrine systems. Human PNMT transcripts and immunoreactivity were mainly detected in norepinephrine neurons in brain and sympathetic ganglion as well as in norepinephrine-producing cells in adrenal medulla of transgenic mice, indicating that the human DBH gene promoter of 4 kilobases is sufficient to direct expression of the gene in norepinephrine-producing cells. Analysis of catecholamines in the various tissues showed that the expression of human PNMT in transgenic mice induced the appearance of epinephrine in sympathetic ganglion and dramatic changes in norepinephrine and epinephrine levels in brain, adrenal gland, and blood. These results indicate that the additional PNMT expression in norepinephrine-producing cells can convert these cells to the epinephrine phenotype, and suggest that norepinephrine-producing cells normally possess the basic machinery required for the synthesis of epinephrine except for PNMT. Thus it appears that the only major difference between norepinephrine- and epinephrine-producing cells is the expression of PNMT. Our transgenic animals provide an experimental model to investigate the functional differences between norepinephrine and epinephrine." @default.
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- W2055387123 date "1992-03-01" @default.
- W2055387123 modified "2023-09-27" @default.
- W2055387123 title "Genetic alteration of catecholamine specificity in transgenic mice." @default.
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- W2055387123 doi "https://doi.org/10.1073/pnas.89.5.1631" @default.
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