Receptor-mediated gene delivery approach demonstrates the role of 5'-proximal DNA region in conferring phenobarbitone responsiveness to CYP2B2 gene in rat liver in vivo

Mani, S. A. ; Harish, S. ; Vathsala, P. G. ; Rangarajan, P. N. ; Padmanaban, G. (2000) Receptor-mediated gene delivery approach demonstrates the role of 5'-proximal DNA region in conferring phenobarbitone responsiveness to CYP2B2 gene in rat liver in vivo Biochemical and Biophysical Research Communications, 268 (3). pp. 734-739. ISSN 0006-291X

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1006/bbrc.2000.2203

Abstract

The phenobarbitone (PB) responsiveness of the 5'-proximal region of the CYP2B1/B2 gene was examined in detail with plasmid DNA constructs containing G-free cassette as reporter, using in vivo targeting of the same DNA constructs into rat liver as galactosylated-polylysine complexes. The contribution of the proximal region (-1 to -179 bp) and the positive element (-69 to -98 bp) identified earlier in this laboratory to PB responsiveness was assessed. The results obtained on PB treatment of rats subjected to receptor-mediated gene delivery to liver were conclusive and dramatic, with the control (saline-treated) rats manifesting very little expression of the reporter, reflecting the in vivo picture of CYP2B1/B2 gene expression. The positive element conferred PB responsiveness to homologous and heterologous promoters. Deletion of the positive element led to elimination of PB response. The entire -179 bp region was significantly more effective in responding to PB treatment than the region up to -98 bp, both containing one copy of the positive element. Thus, the positive element and its flanking sequences in the 5'-proximal region are involved in conferring PB responsiveness to the CYP2B1/B2 gene.

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ID Code:57887
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