Decrease in insulin binding to aortic endothelial cells cultured with high glucose concentration

Hiroshi Ono, Fumio Umeda, Toyoshi Inoguchi, Hiroshi Ibayashi

    研究成果: Contribution to journalArticle査読

    5 被引用数 (Scopus)

    抄録

    We studied the effects of glucose on specific insulin binding to cultured endothelial cells from the bovine aorta. We cultured the cells in Dulbecco's modified Eagle's medium, containing 100 or 300 mg/dl glucose or 100 mg/dl glucose plus 200 mg/dl mannitol. We added 125I-insulin to monolayers of these cells and counted the radioactivity resulting. Specific insulin binding increased with time and dosage. Maximal binding resulted from 0.17 nM 125I-insulin being incubated for 30 min at 37°C, and amounted to 0.35% per 105 cells being bound in cultures of 100 mg/dl glucose. The higher concentration of glucose led to significantly less binding (P < 0.05) (0.24 ± 0.03% vs. 0.38 ± 0.02%, n = 6). The addition of mannitol, on the other hand, did not affect binding. All three incubation conditions produced curvilinear competition curves. Scatchard analysis showed that insulin bound significantly less (P < 0.05) to endothelial cells in 300 mg/dl glucose than to those in 100 mg/dl glucose (4.0 ± 1.2 nmol/l vs. 12.8 ± 3.1, n = 6, mean ± SEM). Insulin binding capacity, however, did not change. We conclude that glucose can reduce insulin binding to endothelial cells and that it may reduce receptor-related insulin transport into and out of the cells.

    本文言語英語
    ページ(範囲)115-119
    ページ数5
    ジャーナルDiabetes Research and Clinical Practice
    6
    2
    DOI
    出版ステータス出版済み - 2 15 1989

    All Science Journal Classification (ASJC) codes

    • Internal Medicine
    • Endocrinology, Diabetes and Metabolism
    • Endocrinology

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