Coupling of glucose response element from L-type pyruvate kinase and G6Pase promoter enhances glucose responsive activity in hepatoma cells |
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Authors: | Michael S Lan Hong-Wei Wang James Chong Mary B Breslin |
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Institution: | (1) The Research Institute for Children, Departments of Pediatrics and Genetics, Children’s Hospital, Louisiana State University Health Sciences Center, 200 Henry Clay Avenue, Research and Education Building, Rm. 2211, New Orleans, LA 70118, USA |
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Abstract: | Type 1 diabetes results from the autoimmune destruction of pancreatic β-cells, which leads to severe insulin deficiency. Insulin
gene therapy provides an attractive approach to cure diabetes. The critical factor for insulin gene therapy in surrogate cells
is to select an appropriate site for insulin expression and a tissue-specific promoter that is responsive to both physiological
glucose and insulin concentrations. A novel chimeric promoter, (GIRE)n-G6Pase, consisting of a 1.6 kb glucose 6-phosphatase
(G6Pase) promoter and a segment of the regulatory element derived from the L-type pyruvate kinase (L-PK) promoter, was designed
to provide strong and tight control of insulin expression in liver. One or three copies of GIRE were linked to the G6Pase
promoter, which showed a stronger promoter activity than the G6Pase promoter alone. The chimeric promoter was inhibited by
insulin in a dosage-dependent manner and activated by glucose, two features essential for glucose metabolism. The promoter
activity is conserved between species and highly specific for liver cells. The construction of a chimeric promoter with stronger
and more sensitive responsive activity to glucose and insulin in liver cells could further advance studies in insulin gene
therapy.
Mr. James Chong was a senior student in the Department of Cell and Molecular Biology, Tulane University. His independent study
project was partially overlapped with this study. |
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Keywords: | Chimeric promoter Insulin H4IIE Diabetes Gene therapy GIRE G6Pase |
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