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Am J Physiol Regul Integr Comp Physiol 283: R296-R302, 2002; doi:10.1152/ajpregu.00760.2001
0363-6119/02 $5.00
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Vol. 283, Issue 2, R296-R302, August 2002

Phosphate transport in the duodenum and jejunum of goats and its adaptation by dietary phosphate and calcium

Korinna Huber, Christina Walter, Bernd Schröder, and Gerhard Breves

Department of Physiology, School of Veterinary Medicine, D-30173 Hannover, Germany

Endogenous Pi recycling is a characteristic feature of the P homeostasis in ruminants. A pronounced salivary Pi secretion into the rumen is balanced by a high intestinal Pi absorption and an almost complete renal Pi reabsorption. In monogastric animals, the major Pi transport mechanism across the apical membrane of the enterocyte is an Na+-dependent transport mediated by NaPi cotransporter type IIb. In ruminants, an Na+-, as well as an H+-dependent, Pi transport system seems to exist in the small intestines. Therefore, morphological localization, type of ionic dependence, and ability to adapt to dietary P or Ca restriction of duodenal and jejunal Pi transport were characterized in goats. In the duodenum, there was an H+-dependent, Na+-sensitive Pi transport system that did not belong to the NaPi type II family and was not influenced by dietary P or Ca restriction. In contrast, in the jejunum, there was an Na+-dependent, H+-sensitive Pi transport mainly mediated by NaPi IIb. P restriction stimulated the NaPi IIb protein expression, resulting in higher Pi transport capacity.

NaPi cotransporter type IIb; proton-sensitive phosphate transport; ruminants


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