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The involvement of the T1R3 receptor protein in the control of glucose metabolism in mice at different levels of glycemia

  • Comparative and Ontogenic Physiology
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Abstract

The heterodimeric protein T1R2/T1R3 is a chemoreceptor mediating taste perception of sugars, several amino acids, and non-caloric sweeteners in humans and many other vertebrate species. The T1R2 and T1R3 proteins are expressed not only in the oral cavity, but also in the intestine, pancreas, liver, adipose tissue, and in structures of the central nervous system, which suggests their involvement in functions other than gustatory perception. In this study, we analyzed the role of the T1R3 protein in regulation of glucose metabolism in experiments with the gene-knockout mouse strain C57BL/6J-Tas1r3 tm1Rfm (Tas1r3-/-), with a deletion of the Tas1r3 gene encoding T1R3, and the control strain C57BL/6ByJ with the intact gene. Glucose tolerance was measured in euglycemic or food-deprived mice after intraperitoneal or intragastric glucose administration. We have shown that in the Tas1r3-/- strain, in addition to the disappearance of taste preference for sucrose, glucose tolerance is also substantially reduced, and insulin resistance is observed. The effect of the Tas1r3 gene knockout on glucose utilization was more pronounced in the euglycemic state than after food deprivation. The baseline glucose level after food deprivation was lower in the Tas1r3-/- strain than in the control strain, which suggests that T1R3 is involved in regulation of endogenous glucose production. These data suggest that the T1R3-mediated glucoreception interacts with the KATP-dependent mechanisms of regulation of the glucose metabolism, and that the main role is likely played by T1R3 expressed in the pancreas and possibly in the central nervous system, but not in the intestinal mucosa, as it was suggested earlier.

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Authors and Affiliations

  1. Pavlov Institute of Physiology, Russian Academy of Sciences, St. Petersburg, Russia

    V. O. Murovets, S. V. Travnikov, A. A. Churikova & V. A. Zolotarev

  2. Monell Chemical Senses Center, Philadelphia, USA

    A. A. Bachmanov

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  1. V. O. Murovets
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  2. A. A. Bachmanov
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  3. S. V. Travnikov
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  4. A. A. Churikova
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  5. V. A. Zolotarev
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Correspondence to V. O. Murovets.

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Original Russian Text © V.O. Murovets, A.A. Bachmanov, S.V. Travnikov, A.A. Churikova, V.A. Zolotarev, 2014, published in Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, 2014, Vol. 50, No. 4, pp. 296s-304.

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Murovets, V.O., Bachmanov, A.A., Travnikov, S.V. et al. The involvement of the T1R3 receptor protein in the control of glucose metabolism in mice at different levels of glycemia. J Evol Biochem Phys 50, 334–344 (2014). https://doi.org/10.1134/S0022093014040061

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