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  Endosomal SGLT1 and its possible role in the regulation of D-glucose uptake

Khoursandi, S., Scharlau, D., Kinne, R. K. H., & Kipp, H. (2004). Endosomal SGLT1 and its possible role in the regulation of D-glucose uptake.

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資料種別: 会議論文

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 作成者:
Khoursandi, Saeed1, 著者
Scharlau, Daniel1, 著者
Kinne, Rolf K. H.2, 著者           
Kipp, Helmut2, 著者           
所属:
1Max Planck Institute of Molecular Physiology, Max Planck Society, ou_1753286              
2Sonstige Wissenschaftliche Organisationseinheiten, Max Planck Institute of Molecular Physiology, Max Planck Society, ou_1753294              

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 要旨: To elucidate the role of endosomal SGLTl in the regulation of sodium-dependent D-glucose uptake into enterocytes, we investigated the relationship between subcellular distribution of SGLTl and sodium-dependent 14C-methylglucose uptake into Caco-2 cells under varying conditions. Incubation with mastoparan shifted a large amount of SGLTl from the apical membrane to intracellular sites and significantly reduced sodiumdependent 14C-methylglucose uptake. We also investigated the effect of extracellular D-glucose levels. Cells pre-incubated with D-glucose free medium exhibited a significantly higher sodiumdependent 14C-methylglucose uptake than cells pre-incubated with high D-glucose medium. No difference in the overall subcellular distribution of SGLTl was observed between the two conditions. Interestingly, the change in 14C-methylglucose uptake was attenuated when microtubules were depolymerized. These results suggest that pharmacologically, D-glucose uptake can be regulated by a shift of the steady state distribution of carriers from the plasma membrane to endosomes. The physiological substrate D-glucose alters substrate uptake by an additional mechanism that requires microtubule-dependent vesicle transport without a change in the steady state distribution. This phenomenon could be explained by the hypothesis that SGLTl undergoes an activation/deactivation cycle during its constitutive cycling from endosomes to the plasma membrane and back.

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言語: eng - English
 日付: 2004-03
 出版の状態: 出版
 ページ: -
 出版情報: -
 目次: -
 査読: 査読あり(内部)
 識別子(DOI, ISBNなど): eDoc: 219423
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関連イベント

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イベント名: Deutsche Physiologische Gesellschaft: 83rd Annual Meeting
開催地: Leipzig, Germany
開始日・終了日: 2004-03-14 - 2004-03-17

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出版物 1

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出版物名: 83rd Annual Meeting DPG. Abstracts pp S1-S19
種別: 特集号
 著者・編者:
Deten, A., 編集者
Briest, W., 編集者
Tag, H., 編集者
所属:
-
出版社, 出版地: -
ページ: Posterabstract 巻号: - 通巻号: P 23-5 開始・終了ページ: S 124 - S 124 識別子(ISBN, ISSN, DOIなど): -

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出版物名: Pflügers Archiv European Journal of Physiology
種別: 学術雑誌
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出版社, 出版地: -
ページ: Posterabstract 巻号: 447 (Supplement 1) 通巻号: - 開始・終了ページ: - 識別子(ISBN, ISSN, DOIなど): -