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Journal Article
Research Support, Non-U.S. Gov't
Roles of Wnt/β-catenin signaling in retinal neuron-like differentiation of bone marrow mesenchymal stem cells from nonobese diabetic mice.
Journal of Molecular Neuroscience : MN 2013 Februrary
Recent studies have shown that mesenchymal stem cells (MSCs) are expected to become promising therapeutic agents for the treatment of diabetic retinopathy (DR); moreover, we previously demonstrated that bone marrow (BM)-MSCs from nonobese diabetic (NOD) mice (an ideal DR model) had abnormal migration and adhesion. So, we hypothesized that NOD-MSCs also have abnormal retinal neuron-like differentiation potential. MSCs were cultured with brain-derived neurotrophic factor, nerve growth factor, and basic fibroblast growth factor. Western blot analysis and immunofluorescence both showed that the level of retinal neuron-like markers, such as glial fibrillary acidic protein, neuron-specific nuclear protein, tyrosine hydroxylase, Thy-1, glutamine synthetase, and rhodopsin was lower in NOD-MSCs than in imprinting control region MSCs. Furthermore, we explored the precise mechanisms controlling this change in NOD-MSCs. The expression levels of some important member proteins in Wnt/β-catenin signaling were determined and suggested the downregulation of Wnt/β-catenin signaling with retinal neuron-like differentiation of NOD-MSCs. Incubation of NOD-MSCs in medium supplemented with human recombinant Wnt1 resulted in a significant upregulation of retinal neuron-like markers, and the effects of Wnt1 were dose-dependent. Taken together, our study indicated that the inhibition of Wnt/β-catenin signaling in NOD-MSCs after induction could contribute to the abnormal retinal neuron-like differentiation. These data provide important preclinical references supporting the basis for further development of autologous MSC-based therapies for DR.
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