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Modulation of sialic acid levels among some organs during insulin resistance or hyperglycemic states

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Abstract

Previous studies have suggested a possible connection between insulin resistance and chronic hyperglycemia with membrane sialic acid content. In this study, the effects of high (20 % ad libitum) fructose and glucose feeding on the sialic acid levels of some organs were investigated in rats. The blood glucose levels of the high fructose- and glucose-fed rats were consistently and significantly (P < 0.05) higher than the normal control throughout the experiment. Free serum sialic acid and total hepatic sialic acid levels were elevated in the high fructose- and glucose-fed rats compared to normal control, but only the data for the high glucose-fed group were significantly (P < 0.05) different from the normal control. Conversely, a significant (P < 0.05) decrease in the pancreatic sialic acid level was observed in high glucose-fed group compared to normal control. Also, the high fructose-fed rats had lower, but insignificant (P > 0.05), pancreatic sialic acid level than the normal control. On the other hand, high fructose and glucose feeding did not significantly (P > 0.05) affect the sialic acid levels of the skeletal muscle and heart, though a tendency to increase the sialic acid level was evident in the heart. In the kidney, the sialic acid level was significantly (P < 0.05) increased in both high fructose- and glucose-fed groups. It was concluded that the liver and kidney tend to stimulate sialic acid synthesis, while the pancreas downregulate sialic acids synthesis and/or promote sialic acid release from glycoconjugates. Also, these organs may contribute to high-serum sialic acid level observed during diabetes.

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Acknowledgment

The management of Ahmadu Bello University, Zaria, Nigeria is acknowledged for providing the materials used for the study. This study was also supported, in part, by the Education Trust Fund-ABU desk office (Grant No.: ETF/DESS/AST&D/ABU ZARIA).

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Correspondence to Mohammed Auwal Ibrahim.

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Ibrahim, M.A., Abdulkadir, A., Onojah, A. et al. Modulation of sialic acid levels among some organs during insulin resistance or hyperglycemic states. Mol Cell Biochem 411, 235–239 (2016). https://doi.org/10.1007/s11010-015-2585-x

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  • DOI: https://doi.org/10.1007/s11010-015-2585-x

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