Endocytosis and Na+/solute cotransport in renal epithelial cells

S. A. Kempson, A. L. Ying, J. A. McAteer, H. Murer

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Endocytic uptake of [3H]sucrose and lucifer yellow, markers for fluid-phase endocytosis, was studied in cultures of the renal epithelial cell lines LLC-PK1 and OK. Endocytosis in LLC-PK1 cells was inhibited when the cells were grown in the presence of gentamicin (1 mg/ml) for 4 days or when the cells were treated with concanavalin A (1 mg/ml) for 5 h. These changes occurred without perturbation of intracellular Na+ and K+ content, indicating that the cells maintained normal ion gradients. The inhibition of endocytosis was accompanied by marked increases in the apparent V(max) for Na+-dependent cell uptake of solutes such as P(i) and L-alanine. The apparent K(m) was unchanged. In contrast, treatment of OK cells with concanavalin A produced marked stimulation of endocytosis and inhibition of the Na+-dependent uptake of P(i) and L-glutamate. These changes occurred in the absence of changes in intracellular Na+ and K+ content. Neither gentamicin nor concanavalin A had a direct effect on Na+/solute cotransport in these cell lines. The changes in Na+/P(i) cotransport induced by concanavalin A in both LLC-PK1 and OK cells were blocked by keeping the cells at 4°C during exposure to the lectin, suggesting that endocytosis may be part of the mechanism which mediates the changes in solute uptake. The reciprocal relationship between the changes in endocytosis and the changes in Na+/solute cotransport is consistent with the possibility that the number of Na+/solute cotransporters present in the plasma membrane may be altered by an increase or decrease in the rate of membrane internalization by endocytosis. The V(max) changes in Na+/solute cotransport provide indirect support for this conclusion.

Original languageEnglish
Pages (from-to)18451-18456
Number of pages6
JournalJournal of Biological Chemistry
Volume264
Issue number31
StatePublished - 1989

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Concanavalin A
Endocytosis
Epithelial Cells
Kidney
Gentamicins
LLC-PK1 Cells
Cells
Cell membranes
Lectins
Alanine
Sucrose
Glutamic Acid
Cell Line
Ions
Membranes
Fluids
Cell Membrane

ASJC Scopus subject areas

  • Biochemistry

Cite this

Kempson, S. A., Ying, A. L., McAteer, J. A., & Murer, H. (1989). Endocytosis and Na+/solute cotransport in renal epithelial cells. Journal of Biological Chemistry, 264(31), 18451-18456.

Endocytosis and Na+/solute cotransport in renal epithelial cells. / Kempson, S. A.; Ying, A. L.; McAteer, J. A.; Murer, H.

In: Journal of Biological Chemistry, Vol. 264, No. 31, 1989, p. 18451-18456.

Research output: Contribution to journalArticle

Kempson, SA, Ying, AL, McAteer, JA & Murer, H 1989, 'Endocytosis and Na+/solute cotransport in renal epithelial cells', Journal of Biological Chemistry, vol. 264, no. 31, pp. 18451-18456.
Kempson SA, Ying AL, McAteer JA, Murer H. Endocytosis and Na+/solute cotransport in renal epithelial cells. Journal of Biological Chemistry. 1989;264(31):18451-18456.
Kempson, S. A. ; Ying, A. L. ; McAteer, J. A. ; Murer, H. / Endocytosis and Na+/solute cotransport in renal epithelial cells. In: Journal of Biological Chemistry. 1989 ; Vol. 264, No. 31. pp. 18451-18456.
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