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http://dx.doi.org/10.3344/kjp.2022.35.2.160

Insulin enhances neurite extension and myelination of diabetic neuropathy neurons  

Pham, Vuong M. (Singapore Institute for Neurotechnology, National University of Singapore)
Thakor, Nitish (Singapore Institute for Neurotechnology, National University of Singapore)
Publication Information
The Korean Journal of Pain / v.35, no.2, 2022 , pp. 160-172 More about this Journal
Abstract
Background: The authors established an in vitro model of diabetic neuropathy based on the culture system of primary neurons and Schwann cells (SCs) to mimic similar symptoms observed in in vivo models of this complication, such as impaired neurite extension and impaired myelination. The model was then utilized to investigate the effects of insulin on enhancing neurite extension and myelination of diabetic neurons. Methods: SCs and primary neurons were cultured under conditions mimicking hyperglycemia prepared by adding glucose to the basal culture medium. In a single culture, the proliferation and maturation of SCs and the neurite extension of neurons were evaluated. In a co-culture, the percentage of myelination of diabetic neurons was investigated. Insulin at different concentrations was supplemented to culture media to examine its effects on neurite extension and myelination. Results: The cells showed similar symptoms observed in in vivo models of this complication. In a single culture, hyperglycemia attenuated the proliferation and maturation of SCs, induced apoptosis, and impaired neurite extension of both sensory and motor neurons. In a co-culture of SCs and neurons, the percentage of myelinated neurites in the hyperglycemia-treated group was significantly lower than that in the control group. This impaired neurite extension and myelination was reversed by the introduction of insulin to the hyperglycemic culture media. Conclusions: Insulin may be a potential candidate for improving diabetic neuropathy. Insulin can function as a neurotrophic factor to support both neurons and SCs. Further research is needed to discover the potential of insulin in improving diabetic neuropathy.
Keywords
Cell Proliferation; Culture Techniques; Diabetic Neuropathies; Glucose; Hyperglycemia; Insulin; In Vitro Techniques; Motor Neurons; Myelin Sheath; Nerve Growth Factors; Neurites; Schwann Cells;
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