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Frontiers of Medicine >> 2009, Volume 3, Issue 1 doi: 10.1007/s11684-009-0010-0

Expression and function of DMT1 without IRE in C6 cells mediated by recombinant adenovirus

State Key Disciplines: Physiology(in incubation), Department of Physiology, Medical College of Qingdao University, Qingdao 266071, China

Available online: 2009-03-05

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Abstract

Divalent metal transporter 1 (DMT1) is a ferrous iron import protein. The improper expression of DMT1 is involved in neurodegenerative diseases. In the present study, we constructed a recombinant adenovirus containing the gene of DMT1 without the iron response element (DMT1-IRE) and investigated its expression and function in the C6 glioma cell line. The DMT1-IRE gene, obtained by RT-PCR, was cloned into the shuttle plasmid pAdTrack-CMV containing green fluorescent protein (GFP) reporter gene. Linearized plasmid pAdTrack-CMV-DMT1-IRE was subsequently co-transformed into ( ) BJ5183 cells along with an adenoviral backbone plasmid pAdEasy-1 after digestion with I. I-digested pAdEasy1-DMT1-IRE was then transfected into E1-transformed human embryonic kidney cells (HEK293 cells) , in which recombinant adenoviruses were generated within 7 to 10 days. The results demonstrated that we obtained the DMT1-IRE gene. pAdEasy1-DMT1-IRE yielded a large fragment, plus a smaller fragment of 4.5 kb after digestion with I. PCR confirmed pAdEasy1-DMT1-IRE contained gene DMT1-IRE, indicating the successful construction of recombinant adenovirus plasmid containing DMT1-IRE. GFP fluorescence further confirmed the generation of adenovirus. AdDMT1-IRE could efficiently infect C6 glioma cells. And cell viability decreased in Ad-DMT1-IRE infected cells after iron overload compared to the control. These results suggest that the over expressed DMT1-IRE can aggravate the iron induced cell death due to its iron influx function.

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