Hexose transport by chicken cecum during development
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Hexose accumulation during development has been studied in tissue slices from chicken cecum. The age of birds ranged from 0 to 7 weeks after hatch. Ceca were divided into six portions according to their situation either proximal (PC), medial (MC) or distal (DC) to the ileocecal junction. In 0-day-old chicks all segments can accumulate 3-O-methyl-d-glucose (0.5 mmol/l) against a concentration gradient through a phloridzin-sensitive mechanism.
Cumulative capacity is lower in DC than in PC and declines with development. Distal segments lose sugar transport ability 1–2 days after hatch whereas the medial region retains some concentrative ability in older birds. In 7-week chickens, PC slices have a similar cumulative ability to that of jejunum (yolk sac region). Kinetic studies showed that in PC the apparentKm for phloridzin-sensitive transport was half that in 1-day- than in 7-week-old birds; apparentVm increased by 50% in this time range. The ability to transport sugars by the cecum was further confirmed in isolated enterocytes from 5- to 7-week-old chickens using α-methyl-d-glucoside (0.1 mmol/l) as substrate. Cell sugar concentration was greater in PC than in jejunal cells and jejunal greater than MC enterocytes. Sugar present in cells from DC was the same as in phloridzin-treated cells. It is concluded that cecal epithelium may play a significant role in the absorption of sugars during development.
Key wordsSugar accumulation, α-methyl-d-glucoside, 3-O-methyl-d-glucose Tissue slices Isolated enterocytes Gallus domesticus L.
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