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Increased sodium-dependent D-glucose transport in the jejunal brush-border membrane of spontaneously hypertensive rat

  • Original Article
  • Transport processes, metabolism and endocrinology; kidney, gastrointestinal tract, and exocrine glands
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Abstract

The current studies explore the effect of hypertension on D-glucose transport into jejunal brush-border membrane vesicles (BBMV). Spontaneously hypertensive rats (SHR) and normotensive Wistar-Kyoto (WKY) rats, as a control group, were used. The purity of the BBMV from both groups of animals was validated by the finding that the specific activity of brush-border enzyme marker, sucrase, was severalfold greater in membrane vesicles compared with corresponding values in mucosal homogenate. D-glucose uptake was Na+ dependent in both groups of animals, with a transient increase in the intravesicular concentration of D-glucose. However, the initial rate and the magnitude of the accumulation of Na+-dependent D-glucose was significantly higher in SHR compared with WKY rats. In order to investigate the mechanism(s) for the increase in Na+-dependent D-glucose transport in SHR, several experiments were performed: (1) an experiment that indicated 22Na uptake, as an indicator for Na+ permeability, was similar between SHR and WKY rats, (2) kinetic studies that indicated that Vmax values of SHR were significantly greater that those of WKY rats. In contrast, similar Km values for glucose were found between SHR and WKY rats, (3) Na+-dependent phlorizin binding measurements that were not altered by hypertension and (4) a study of the brush-border membrane lipid composition that showed a significant increase in the free cholesterol/phospholipid ratio in SHR. We conclude that altered membrane cholesterol content and consequently altered lipid fluidity could be, at least in part, responsible for the observed increase in Na+-dependent D-glucose transport in SHR.

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Authors and Affiliations

  1. Departamento de Fisiología y Biología Animal, C/Tramontana s/n, E-41012, Seville, Spain

    Carmen María Vázquez & Rocío Coleto

  2. Institute de la Grasa (CSIC), Avda Padre García Tejero s/n, E-41012, Seville, Spain

    Rosana Zanetti & Valentina Ruiz-Gutierrez

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  1. Carmen María Vázquez
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  2. Rocío Coleto
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  3. Rosana Zanetti
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  4. Valentina Ruiz-Gutierrez
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Vázquez, C.M., Coleto, R., Zanetti, R. et al. Increased sodium-dependent D-glucose transport in the jejunal brush-border membrane of spontaneously hypertensive rat. Pflugers Arch. 432, 329–335 (1996). https://doi.org/10.1007/s004240050140

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  • DOI: https://doi.org/10.1007/s004240050140

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