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Cardiovascular Diabetology
Published in: Cardiovascular Diabetology 1/2019

Open Access 01-12-2019 | Insulins | Original investigation

Cardiac ischemia–reperfusion injury under insulin-resistant conditions: SGLT1 but not SGLT2 plays a compensatory protective role in diet-induced obesity

Authors: Akira Yoshii, Tomohisa Nagoshi, Yusuke Kashiwagi, Haruka Kimura, Yoshiro Tanaka, Yuhei Oi, Keiichi Ito, Takuya Yoshino, Toshikazu D. Tanaka, Michihiro Yoshimura

Published in: Cardiovascular Diabetology | Issue 1/2019

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Abstract

Background

Recent large-scale clinical trials have shown that SGLT2-inhibitors reduce cardiovascular events in diabetic patients. However, the regulation and functional role of cardiac sodium–glucose cotransporter (SGLT1 is the dominant isoform) compared with those of other glucose transporters (insulin-dependent GLUT4 is the major isoform) remain incompletely understood. Given that glucose is an important preferential substrate for myocardial energy metabolism under conditions of ischemia–reperfusion injury (IRI), we hypothesized that SGLT1 contributes to cardioprotection during the acute phase of IRI via enhanced glucose transport, particularly in insulin-resistant phenotypes.

Methods and results

The hearts from mice fed a high-fat diet (HFD) for 12 weeks or a normal-fat diet (NFD) were perfused with either the non-selective SGLT-inhibitor phlorizin or selective SGLT2-inhibitors (tofogliflozin, ipragliflozin, canagliflozin) during IRI using Langendorff model. After ischemia–reperfusion, HFD impaired left ventricular developed pressure (LVDP) recovery compared with the findings in NFD. Although phlorizin-perfusion impaired LVDP recovery in NFD, a further impaired LVDP recovery and a dramatically increased infarct size were observed in HFD with phlorizin-perfusion. Meanwhile, none of the SGLT2-inhibitors significantly affected cardiac function or myocardial injury after ischemia–reperfusion under either diet condition. The plasma membrane expression of GLUT4 was significantly increased after IRI in NFD but was substantially attenuated in HFD, the latter of which was associated with a significant reduction in myocardial glucose uptake. In contrast, SGLT1 expression at the plasma membrane remained constant during IRI, regardless of the diet condition, whereas SGLT2 was not detected in the hearts of any mice. Of note, phlorizin considerably reduced myocardial glucose uptake after IRI, particularly in HFD.

Conclusions

Cardiac SGLT1 but not SGLT2 plays a compensatory protective role during the acute phase of IRI via enhanced glucose uptake, particularly under insulin-resistant conditions, in which IRI-induced GLUT4 upregulation is compromised.
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Metadata
Title
Cardiac ischemia–reperfusion injury under insulin-resistant conditions: SGLT1 but not SGLT2 plays a compensatory protective role in diet-induced obesity
Authors
Akira Yoshii
Tomohisa Nagoshi
Yusuke Kashiwagi
Haruka Kimura
Yoshiro Tanaka
Yuhei Oi
Keiichi Ito
Takuya Yoshino
Toshikazu D. Tanaka
Michihiro Yoshimura
Publication date
01-12-2019
Publisher
BioMed Central
Published in
Cardiovascular Diabetology / Issue 1/2019
Electronic ISSN: 1475-2840
DOI
https://doi.org/10.1186/s12933-019-0889-y

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