Maturation of jejunal phosphate transport by rat brush border membrane vesicles

Stephen M. Borowitz, Fayez K. Ghishan

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

The transport of phosphate into jejunal brush border membrane vesicles isolated from 14- to 42-day-old rats was investigated using a rapid filtration technique. The presence of a sodium gradient enhanced phosphate uptake at all ages. Both sodium-dependent phosphate uptake and passive phosphate uptake declined with increasing age. The activity of the sodium/phosphate co-transporter was significantly greater in the 14-day-old suckling animals than in the 42-day-old animals. Experiments with valinomycin in 14- and 42-day-old animals showed that at pH 7.4, phosphate uptake is electroneutral at both ages. These findings demonstrate there are matu-rational changes in the jejunal transport of phosphate. Suckling animals transport significantly more phosphate than adult animals. The increased uptake in the younger animals is related to an increase in the active uptake of phosphate and an increase in the passive permeability to phosphate.

Original languageEnglish (US)
Pages (from-to)1308-1312
Number of pages5
JournalPediatric Research
Volume19
Issue number12
DOIs
StatePublished - Dec 1985
Externally publishedYes

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health

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