Protein kinase C mediated intracellular signaling pathways are involved in the regulation of sodium-dependent glucose co-transporter SGLT1 activity.

Abstract:

:The sodium-dependent glucose co-transporter (SGLT1) is regulated by protein kinases. The aim of the present study was to examine the role of protein kinase C (PKC) in the regulation of rabbit (rb) SGLT1 activity as determined by alpha-methyl-D-glucopyranoside (AMG) uptake and to identify the cellular mechanisms involved in this process. For this purpose Chinese hamster ovary cells expressing rbSGLT1 (CHO-G6D3) were treated with PKC activators and inhibitors. PKC activators did not exert any effect on AMG uptake, as corroborated by mutation of the putative phosphorylation sites of PKC. In contrast, the PKC inhibitor bisindolylmaleimide I (BIM) increased AMG uptake. This effect was associated with translocation of rbSGLT1 from the intracellular pool to the plasma membrane demonstrated by pre-treatment of G6D3 cells with cytochalasin D that abolished the effect of BIM. In addition, intracellular signaling pathways (p38/MAPK, ERK/MAPK, JNK/MAPK, and PI3K/Akt/mTOR) were associated with PKC-regulated AMG uptake. Moreover, rbSGLT1 mRNA level was higher in BIM-treated cells than in untreated, control cells. This effect was completely abolished by actinomycin D treatment. The present study demonstrates that PKC regulates rbSGLT1 activity via a complex intracellular mechanism that involves sorting and transcriptional regulation of rbSGLT1. The study findings suggest the involvement of two complementary opposite mechanism of action, in which the balance between two antagonistic effects, namely stimulation and inhibition of the transporter, regulates the activity of rbSGLT1 by PKC.

journal_name

J Cell Biochem

authors

Castaneda-Sceppa C,Subramanian S,Castaneda F

doi

10.1002/jcb.22489

subject

Has Abstract

pub_date

2010-04-15 00:00:00

pages

1109-17

issue

6

eissn

0730-2312

issn

1097-4644

journal_volume

109

pub_type

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