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- W2079391192 abstract "The influence of aging of biotin intestinal transport was examined in Fisher 344 rats (3- 12- and 24-month old) using a brush border membrane vesicle (BBMV) technique. In all age groups examined, transport of biotin as a function of concentration was saturable in the presence of a Na+ gradient (out greater than in), but was lower and linear in the presence of a choline gradient (out greater than in.). The Vmax of the biotin transport process was found to be significantly (p less than 0.01) higher in 24-month-old rats compared to 3- and 12-month old rats. On the other hand, the apparent Km of the biotin transport system was similar in all age groups. We also measured plasma levels of biotin in the different age groups. The mean plasma levels of biotin in 24-month-old rats was found to be significantly higher than that of 3-month (p less than 0.005) and 12-month (p less than 0.025) old rats. These results demonstrate that aging is associated with an increase in biotin intestinal transport. This increase appears to be due to changes in the activity (and/or number) but not the affinity of the biotin transport system. Furthermore, an increase in plasma biotin levels was observed with aging, which might be a consequence to the increase in the vitamin's intestinal transport." @default.
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- W2079391192 date "1990-01-01" @default.
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- W2079391192 title "Effect of aging on intestinal biotin transport in the rat" @default.
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- W2079391192 doi "https://doi.org/10.1016/0531-5565(90)90011-p" @default.
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