期刊
NEUROCHEMICAL RESEARCH
卷 46, 期 6, 页码 1350-1358出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11064-021-03269-2
关键词
GLP-1 analogue; Glycogen-synthase kinase-3; Insulin resistance; SH-SY5Y cell line; Streptozotocin; Retinoic acid induced differentiation
资金
- Semmelweis University
The study revealed that the impact of STZ on insulin signaling in differentiated SH-SY5Y cells differed from undifferentiated cells. Differentiation reduced sensitivity to the non-specific cytotoxicity of STZ and emphasized the development of insulin resistance.
Recently neuronal insulin resistance was suggested playing a role in Alzheimer's disease. Streptozotocin (STZ) is commonly used to induce impairment in insulin metabolism. In our previous work on undifferentiated SH-SY5Y cells the compound exerted cytotoxicity without altering insulin sensitivity. Nevertheless, differentiation of the cells to a more mature neuron-like phenotype may considerably affect the significance of insulin signaling and its sensitivity to STZ. We aimed at studying the influence of STZ treatment on insulin signaling in SH-SY5Y cells differentiated by retinoic acid (RA). Cytotoxicity of STZ or low serum (LS) condition and protective effect of insulin were compared in RA differentiated SH-SY5Y cells. The effect of insulin and an incretin analogue, exendin-4 on insulin signaling was also examined by assessing glycogen synthase kinase-3 (GSK-3) phosphorylation. STZ was found less cytotoxic in the differentiated cells compared to our previous results in undifferentiated SH-SY5Y cells. The cytoprotective concentration of insulin was similar in the STZ and LS groups. However, the right-shifted concentration-response curve of insulin induced GSK-3 phosphorylation in STZ-treated differentiated cells is suggestive of the development of insulin resistance that was further confirmed by the insulin potentiating effect of exendin-4. Differentiation reduced the sensitivity of SH-SY5Y cells for the non-specific cytotoxicity of STZ and enhanced the relative significance of development of insulin resistance. The differentiated cells thus serve as a better model for studying the role of insulin signaling in neuronal survival. However, direct cytotoxicity of STZ also contributes to the cell death.
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