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The Journal of Neuroscience, August 20, 2003, 23(20):7710-7718
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Insulin-Like Growth Factor (IGF) Signaling through Type 1 IGF Receptor Plays an Important Role in Remyelination
Jeffrey L. Mason,1
Shouhong Xuan,2
Ioannis Dragatsis,2
Argiris Efstratiadis,2 and
James E. Goldman1
1Department of Pathology and The Center for
Neurobiology and Behavior, and 2Department of Genetics
and Development, Columbia University, New York, New York 10032
We examined the role of IGF signaling in the remyelination process by
disrupting the gene encoding the type 1 IGF receptor (IGF1R) specifically in
the mouse brain by Cre-mediated recombination and then exposing these mutants
and normal siblings to cuprizone. This neurotoxicant induces a demyelinating
lesion in the corpus callosum that is reversible on termination of the insult.
Acute demyelination and oligodendrocyte depletion were the same in mutants and
controls, but the mutants did not remyelinate adequately. We observed that
oligodendrocyte progenitors did not accumulate, proliferate, or survive within
the mutant mice, compared with wild type, indicating that signaling through
the IGF1R plays a critical role in remyelination via effects on
oligodendrocyte progenitors.
Key words: demyelination; oligodendrocyte; progenitors; apoptosis; macrophages; transgenic
Received Apr. 10, 2003;
revised Jun. 11, 2003;
accepted Jul. 7, 2003.
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