Comp Biochem Physiol A Mol Integr Physiol 2003 Jul 01;1353:467-75. doi: 10.1016/s1095-6433(03)00131-4.

Expression of Na(+) / D-glucose cotransport in Xenopus laevis oocytes by injection of poly(A)(+) RNA isolated from lobster (Homarus americanus) hepatopancreas.

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Xenopus laevis oocytes were used for expression and characterization of lobster (Homarus americanus) hepatopancreas Na(+)-dependent D-glucose transport activity. Poly(A)(+) RNA from the whole hepatopancreatic tissue was injected and transport activity was assayed by alpha-D-[2-(3)H] glucose. Injection of lobster hepatopancreatic poly(A)(+) RNA resulted in a dose (1-20 ng) and time (1-5 days) dependent increase of Na(+)-dependent D-glucose uptake. Kinetics of Na(+)-dependent glucose transport was a hyperbolic function (K(m)=0.47+/-0.04 mM) of external D-glucose concentration and a sigmoidal function (K(Na)=68.32+/-1.57 mM; Hill coefficient=2.22+/-0.09) of external Na(+) concentration. In addition, Na(+)-dependent D-glucose uptake was significantly inhibited by both (0.1-0.5 mM) phloridzin and (0.1-0.5 mM) methyl-alpha-D-glucopyranoside. After size fractionation through a sucrose density gradient, poly(A)(+) RNA fractions with an average length of 2-4 kb induced a twofold increase in Na(+)-dependent phloridzin-inhibited D-glucose uptake as compared to total poly(A)(+) RNA-induced uptake. The results of this study provide the functional basis to screen lobster hepatopancreatic cDNA libraries for clones encoding putative and still not known crustacean SGLT-type Na(+)/glucose co-transporter(s).

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