# |
PMID |
Sentence |
1 |
10748204
|
The MEF2A isoform is required for striated muscle-specific expression of the insulin-responsive GLUT4 glucose transporter.
|
2 |
10748204
|
Previously, we have demonstrated that an MEF2 consensus sequence located between -473/-464 in the human GLUT4 gene was essential for both tissue-specific and hormonal/metabolic regulation of GLUT4 expression (Thai, M.
|
3 |
10748204
|
To identify the specific MEF2 isoform(s) responsible for GLUT4 expression, we studied the pattern of expression of the MEF2 isoforms in insulin-sensitive tissues.
|
4 |
10748204
|
Both heart and skeletal muscle were found to express the MEF2A, MEF2C, and MEF2D isoforms but not MEF2B.
|
5 |
10748204
|
However, only the MEF2A protein was selectively down-regulated in insulin-deficient diabetes.
|
6 |
10748204
|
Electrophoretic mobility shift assays revealed that nuclear extracts from diabetic animals had reduced binding to the MEF2 binding site compared with extracts from control or insulin-treated animals.
|
7 |
10748204
|
However, addition of MEF2A to diabetic nuclear extracts fully restored binding activity to the MEF2 element.
|
8 |
10748204
|
These data strongly suggest that the MEF2A-MEF2D heterodimer is selectively decreased in insulin-deficient diabetes and is responsible for hormonally regulated expression of the GLUT4 gene.
|
9 |
11316766
|
The MEF2A and MEF2D isoforms are differentially regulated in muscle and adipose tissue during states of insulin deficiency.
|
10 |
11316766
|
Previously we have demonstrated that striated muscle GLUT4 gene expression decreased following streptozotocin-induced diabetes due to a loss of MEF2A transcription factor expression without any significant effect on the MEF2D isoform (Mora, S. and J.
|
11 |
11316766
|
However, addition of in vitro synthesized MEF2A to adipose nuclear extracts results in the formation of the expected MEF2/DNA complex.
|
12 |
11316766
|
Furthermore, in vivo overexpression of MEF2A selectively in adipose tissue did not affect GLUT4 or MEF2D expression and was not sufficient to prevent GLUT4 down-regulation that occurred in insulin-deficient states.
|
13 |
11316766
|
The MEF2A and MEF2D isoforms are differentially regulated in muscle and adipose tissue during states of insulin deficiency.
|
14 |
11316766
|
Previously we have demonstrated that striated muscle GLUT4 gene expression decreased following streptozotocin-induced diabetes due to a loss of MEF2A transcription factor expression without any significant effect on the MEF2D isoform (Mora, S. and J.
|
15 |
11316766
|
However, addition of in vitro synthesized MEF2A to adipose nuclear extracts results in the formation of the expected MEF2/DNA complex.
|
16 |
11316766
|
Furthermore, in vivo overexpression of MEF2A selectively in adipose tissue did not affect GLUT4 or MEF2D expression and was not sufficient to prevent GLUT4 down-regulation that occurred in insulin-deficient states.
|