Insulin-induced alterations in the lactoperoxidase-catalyzed radioiodination of membrane proteins of the toad bladder epithelium

W. N. Scott, S. L. Slatin, H. Cobb, I. M. Reich

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Insulin-stimulated sodium transport in the toad urinary bladder consists of two components, a brief element of rapid onset that is independent of protein synthesis, and a sustained increase, slower in onset, that is dependent upon RNA and protein synthesis. The mucosal epithelium of the toad bladder was labeled by lactoperoxidase-catalyzed radioiodination (125I) following 15 min and 3 h exposure to insulin. The membranes of 'mitochondria-rich' and 'granular' mucosal cells from these tissues were analyzed by electrophoresis in SDS-urea. Compared to untreated tissues, membranes of 'granular' mucosal cells from tissues exposed to insulin for 15 min contained a band (M(r)=15,000) with significantly increased labeling. Bladders exposed to insulin for 3 h showed no consistent increase in labeling. These data suggest that there are differences in the conformation of apical membrane proteins during the two phases of hormone-induced sodium transport. The technique may also offer an opportunity to identify 'effector' proteins mediating this and other insulin responses.

Original languageEnglish (US)
Pages (from-to)1775-1777
Number of pages3
JournalEndocrinology
Volume109
Issue number5
StatePublished - 1981

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Lactoperoxidase
Anura
Membrane Proteins
Urinary Bladder
Epithelium
Insulin
Mucous Membrane
Proteins
Membranes
Urea
Electrophoresis
Mitochondria
Sodium
Hormones
RNA

ASJC Scopus subject areas

  • Endocrinology
  • Endocrinology, Diabetes and Metabolism

Cite this

Insulin-induced alterations in the lactoperoxidase-catalyzed radioiodination of membrane proteins of the toad bladder epithelium. / Scott, W. N.; Slatin, S. L.; Cobb, H.; Reich, I. M.

In: Endocrinology, Vol. 109, No. 5, 1981, p. 1775-1777.

Research output: Contribution to journalArticle

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