Studies on lipids and the activity of Na,K-ATPase in lens fibre cells

William L. Dean, Nicholas A Delamere, Douglas Borchman, Amy E. Moseley, Rajesh P. Ahuja

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Na,K-ATPase was studied in the two cell types that make up the lens of the eye. Membrane material was isolated from lens fibre cells, which make up the bulk of the lens cell mass, and also from lens epithelial cells, which are present only as a monolayer on the anterior lens surface. Judged by immunoblotting, greater amounts of Na,K-ATPase α1 and β1 polypeptides were found in fibre cell membrane material than in epithelial cell membrane material. However, the Na,K-ATPase activity in epithelial cell membrane material was 20 times that measured in fibre cell membrane material. In 86Rb uptake experiments with intact lenses, ouabain-inhibitable 86Rb uptake was observed for lens epithelium but not for lens fibres. These findings are consistent with a low Na,K-ATPase activity in lens fibre cells even though these cells express a considerable amount of Na,K-ATPase α1 and β1 polypeptides. The lipid composition of lens fibre cell membranes causes them to be more ordered than epithelial cell membranes; this was confirmed by measurements of the infrared CH2 symmetric stretching band frequency. Because lipid composition can influence Na,K-ATPase activity, experiments were conducted to determine whether the activity of Na,K-ATPase α1β1 is inhibited by lens fibre lipid. However, no significant difference in Na,K-ATPase activity was detected when Na,K-ATPase α1β1 was purified from rabbit kidney and then reconstituted with lipid that had been isolated from either lens epithelium or lens fibre cells. These studies indicate that lens fibre cells contain both Na,K-ATPase α1 and β1 polypeptides but have low Na,K-ATPase activity. However, the results do not support the notion that this is due to the lipid composition of lens fibre cell membranes.

Original languageEnglish (US)
Pages (from-to)961-967
Number of pages7
JournalBiochemical Journal
Volume314
Issue number3
StatePublished - Mar 15 1996
Externally publishedYes

Fingerprint

Lenses
Adenosine Triphosphatases
Lipids
Fibers
Cell membranes
Cell Membrane
Epithelial Cells
sodium-translocating ATPase
Peptides
Epithelium
Chemical analysis
Crystalline Lens
Ouabain
Immunoblotting
Frequency bands
Stretching
Monolayers
Experiments
Rabbits
Kidney

ASJC Scopus subject areas

  • Biochemistry

Cite this

Dean, W. L., Delamere, N. A., Borchman, D., Moseley, A. E., & Ahuja, R. P. (1996). Studies on lipids and the activity of Na,K-ATPase in lens fibre cells. Biochemical Journal, 314(3), 961-967.

Studies on lipids and the activity of Na,K-ATPase in lens fibre cells. / Dean, William L.; Delamere, Nicholas A; Borchman, Douglas; Moseley, Amy E.; Ahuja, Rajesh P.

In: Biochemical Journal, Vol. 314, No. 3, 15.03.1996, p. 961-967.

Research output: Contribution to journalArticle

Dean, WL, Delamere, NA, Borchman, D, Moseley, AE & Ahuja, RP 1996, 'Studies on lipids and the activity of Na,K-ATPase in lens fibre cells', Biochemical Journal, vol. 314, no. 3, pp. 961-967.
Dean WL, Delamere NA, Borchman D, Moseley AE, Ahuja RP. Studies on lipids and the activity of Na,K-ATPase in lens fibre cells. Biochemical Journal. 1996 Mar 15;314(3):961-967.
Dean, William L. ; Delamere, Nicholas A ; Borchman, Douglas ; Moseley, Amy E. ; Ahuja, Rajesh P. / Studies on lipids and the activity of Na,K-ATPase in lens fibre cells. In: Biochemical Journal. 1996 ; Vol. 314, No. 3. pp. 961-967.
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