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Theranostics 2021; 11(9):4502-4515. doi:10.7150/thno.54498 This issue Cite

Review

Impact of sodium glucose cotransporter 2 (SGLT2) inhibitors on atherosclerosis: from pharmacology to pre-clinical and clinical therapeutics

Zhenghong Liu¹, Xiaoxuan Ma¹, Iqra Ilyas¹, Xueying Zheng¹, Sihui Luo¹, Peter J. Little^2,3, Danielle Kamato³, Amirhossein Sahebkar^4,5, Weiming Wu⁶, Jianping Weng¹ , Suowen Xu¹

1. Department of Endocrinology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.
2. Sunshine Coast Health Institute, University of the Sunshine Coast, Birtinya, QLD 4575, Australia.
3. School of Pharmacy, Pharmacy Australia Centre of Excellence, the University of Queensland, Woolloongabba, Queensland 4102, Australia.
4. Halal Research Center of IRI, FDA, Tehran, Iran.
5. Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad. Iran.
6. Changshu Hospital Affiliated to Nanjing University of Chinese Medicine, Changshu, China.

✉ Corresponding authors: Suowen Xu, PhD, E-mail: sxu1984edu.cn; ORCID: 0000-0002-5488-5217; Jianping Weng, MD, PhD, E-mail: wengjpedu.cn; ORCID: 0000-0002-7889-1697.

Abstract

Sodium-glucose cotransporter 2 inhibitors (SGLT2i) are new oral drugs for the therapy of patients with type 2 diabetes mellitus (T2DM). Research in the past decade has shown that drugs of the SGLT2i class, such as empagliflozin, canagliflozin, and dapagliflozin, have pleiotropic effects in preventing cardiovascular diseases beyond their favorable impact on hyperglycemia. Of clinical relevance, recent landmark cardiovascular outcome trials have demonstrated that SGLT2i reduce major adverse cardiovascular events, hospitalization for heart failure, and cardiovascular death in T2DM patients with/without cardiovascular diseases (including atherosclerotic cardiovascular diseases and various types of heart failure). The major pharmacological action of SGLT2i is through inhibiting glucose re-absorption in the kidney and thus promoting glucose excretion. Studies in experimental models of atherosclerosis have shown that SGLT2i ameliorate the progression of atherosclerosis by mechanisms including inhibition of vascular inflammation, reduction in oxidative stress, reversing endothelial dysfunction, reducing foam cell formation and preventing platelet activation. Here, we summarize the anti-atherosclerotic actions and mechanisms of action of SGLT2i, with an aim to emphasize the clinical utility of this class of agents in preventing the insidious cardiovascular complications accompanying diabetes.

Keywords: SGLT2 inhibitors, diabetes, atherosclerosis, therapy, cardiovascular complications

Introduction

Atherosclerosis is the major potential pathology of most cardiovascular disease (CVD), including myocardial infarction (MI), heart failure (HF), stroke, and peripheral arterial disease [1]. CVDs are the leading cause of morbidity and mortality globally [1, 2]. In patients with diabetes, CVDs are the majority cause of premature mortality. Atherosclerosis is a slow-progressing inflammatory disease with a complex biochemical and cellular etiology characterized by the deposition of modified lipids in the arteries, the development of lipid-laden atherosclerotic plaques and ultimately the rupture of the plaque which precipitates the lethal clinical event being a heart attack or stroke [3, 4]. The conventional risk factors for atherosclerosis and its thrombotic complications include hypertension, obesity, smoking, dyslipidemia, depression, sedentary lifestyles and diabetes [1]. In particular, it is difficult to separate the effects of diabetes from those of other atherogenic factors. Patients with type 2 diabetes mellitus (T2DM) have a higher risk of atherosclerosis and other complications compared with those without diabetes, and ~80 percent of mortality in individuals with T2DM is due to cardiovascular events [5-7].

Sodium-glucose cotransporter 2 inhibitors (SGLT2i) have been developed as hypoglycemic drugs that target SGLT2, the major glucose transporter in the kidney responsible for about 90 percent of glucose reabsorption from primary urine [8]. Recent evidence has suggested the use of SGLT2i as an adjunct to standard treatment to improve clinically relevant renal and cardiovascular outcomes in patients with T2DM [6, 9]. SGLT2i can reduce glycosylated hemoglobin, body weight, blood pressure, plasma volume, increase in erythrocyte mass, and improve cardiac energy metabolism, which imposes a positive influence on cardiovascular risk factors and outcomes [5, 10-12]. In light of the important clinical benefits of SGLT2i in improving cardiovascular outcomes, we provide a comprehensive and insightful overview of the pharmacological effects and underlying mechanisms of action of SGLT2i in CVD prevention, with a focus on mechanism addressing the accelerated atherosclerosis associated with diabetes.

The pharmacological basis of SGLT2i

The SGLT2 protein, encoded by SLC5A2, is a member of the sodium-glucose cotransporter family and it undertakes the function of transporting glucose from the renal tubule lumen to renal tubule epithelial cells [13]. SGLT2 is abundantly expressed in the anterior part of the proximal tubule [14, 15]. Mining of GTEx database indicated that SGLT2 and SGLT1 are expressed in the kidney and intestine, respectively (Figure S1).

Phlorizin, the first natural SGLT2i, was isolated from the root bark of apple trees in 1835. Due to its low water solubility and poor absorption in the gastrointestinal tract, it was not developed as an anti-hyperglycemic agent [16]. T-1095, a phlorizin derivative, overcomes some shortcomings of phlorizin, but could not go through clinical development [17]. Later, c-aryl glycosides derived from the basic structure of phlorizin were subsequently developed, such as dapagliflozin and canagliflozin [18, 19]. In addition to structural differences, they also have variable selectivity to SGLT1 and SGLT2 (Table 1) [20].

 Table 1 

Approved SGLT2 inhibitors in clinics

SGLT2i	Pubchem CID	Recommended starting dose (once daily)	Structure	selectivity (SGLT2:SGLT1)
Empagliflozin	11949646	10 mg		~ 2700:1
Dapagliflozin	9887712	5 mg		~ 1200:1
Canagliflozin	24812758	100 mg		~ 414:1
Ipragliflozin	10453870	50 mg		~ 860:1
Tofogliflozin	46908929	20 mg		~ 3000:1
Luseogliflozin	11988953	2.5 mg		~ 1770:1
Ertugliflozin	44814423	5 mg		~ 2200:1

The expression of SGLT2 is up-regulated, and the urinary glucose excretion threshold is also higher in patients with hyperglycemia compared with healthy humans [21]. Inhibition of SGLT2 reduces glucose reabsorption, promotes urinary glucose excretion, and produces negative caloric balance, which leads to weight loss [22]. SGLT2i, including canagliflozin, dapagliflozin and empagliflozin, directly target SGLT2 instead of insulin secretion and insulin action as compared with other anti-hyperglycemic agents [13]. SGLT2i can thus be used on top of other oral glucose-lowering drugs and insulin to exert additive anti-hyperglycemic effects [14].

At present, there are four SGLT2i (empagliflozin, canagliflozin, dapagliflozin, ertugliflozin) approved by the US Food and Drug Administration (FDA) and the European Union [23, 24]. Some other drugs in the class like ipragliflozin, tofogliflozin and luseogliflozin are approved in Japan [25-27].

Effects of SGLT2 inhibitors in CVD: clinical evidence

Many clinical studies have consistently shown that SGLT2i have multiple cardioprotective functions which manifest as reduced CVD (Table 2). The landmark EMPA-REG OUTCOME study was the first to offer convincing evidence that anti-diabetic drugs can reduce the occurrence of cardiovascular events. The trial randomly selected 7,020 diabetic patients with CVD. 3-point MACE (major adverse cardiovascular events, including death from cardiovascular causes, nonfatal MI, and nonfatal stroke), the primary outcome, was reduced by 14%. Hospitalization for heart failure (HHF) was reduced by 35% [9]. However, the incidence of MI or stroke was not significant. The primary outcome is largely due to the reduction in death from cardiovascular causes [9]. Subsequent experiments on renal effects of empagliflozin treatment also demonstrated that, compared with placebo, empagliflozin treatment group showed a slower progression of renal disease [28]. Moreover, at 2020 at the European Society of Cardiology (ESC) annual meeting, the results of the EMPEROR-Reduced study, which extended the benefits of SGLT2i to patients with more advanced and severe chronic HF. The combined risk of HHF or cardiovascular death in patients receiving empagliflozin was 25% lower than placebo. In addition, empagliflozin-treated patients had a lower risk of serious renal outcomes [29, 30]. In secondary analysis of the EMPEROR-Reduced trial indicated that patients treated with empagliflozin had improvement in health status [31]. The efficacy and safety of empagliflozin in patients was not influenced by basal therapy with a neprilysin inhibitor [32]. Combined treatment with both drugs may produce additional benefits [32].

Similar to EMPA-REG OUTCOME study, the CANVAS program showed a statistically significant reduction in 3-point MACE and HHF in the canagliflozin-treated patients [33]. However, no benefit for non-fatal MI and stroke was observed. The composite renal endpoints were reduced by 27% for patients with canagliflozin therapy [33]. Similarly, the CREDENCE trial analyzed cardiovascular, renal, and safety outcomes and showed that canagliflozin treatment reduced 3-point MACE and the stand-alone endpoint of HHF, as well as the risk of the primary outcome (end-stage kidney disease, doubling of serum creatinine, renal or cardiovascular death). This study also supported the concept that drugs of the SGLT2i class have clinical efficacy regardless of patients' HbA1c levels [34, 35].

The DECLARE-TIMI 58 trial indicated that treatment with dapagliflozin did not impact the 3-point MACE but significantly reduced the risk of HHF. Dapagliflozin also reduced the composite renal endpoint by 24 % [36, 37]. Another trial, DAPA-HF, has shown that among patients with HF and reduced ejection fraction, patients receiving dapagliflozin had a lower risk of exacerbating HF or cardiovascular death than patients receiving placebo, regardless of whether they have diabetes or not [38]. A post hoc analysis indicated that SGLT2i acted on background therapies of HF and reduced ejection fraction in a mechanistically-independent and complementary manner [39].

The VERTIS-CV study included 8,246 T2DM patients with confirmed disorder in coronary artery, cerebral and/or peripheral arterial system. The incidences of 3-point MACE in the ertugliflozin and placebo groups were similar, showing no significant difference, but ertugliflozin significantly reduced the risk of HHF [40]. Patients who used SGLT2i had a lower risk of ischemic heart disease than those who did not use SGLT2i. The decrease in systolic blood pressure caused by SGLT2i was partially responsible for the results observed [41].

Despite the above-mentioned clinical trials showing the reduction in cardiovascular events in the SGLT2i treated groups (compared to placebo), only empagliflozin and canagliflozin had protective effects on 3-point MACEs [42]. The favorable clinical outcomes are hypothesized to be mainly driven by reduction of the rate of HHF. However, some large multi-national observational studies in patients with T2DM and cardiovascular risk suggested beneficial effects of SGLT2i also directed to MI and stroke which are events most closely associated with atherosclerosis and its clinical sequalae [43, 44].

In contrast, another analysis found that glucose-lowering drugs including SGLT2i significantly reduced the risk of atherosclerotic events but had no significant effect on the risk of HF, indicating the need for further clinical and basic studies in this exciting new area of the therapeutics of diabetes and its CVD consequences [45].

A meta-analysis of three SGLT2i related clinical trials found that the reduction in 3-point MACE was not large, and this effect was limited to patients with established ASCVD [46]. Also, the UTOPIA trial investigated the effects of tofogliflozin in T2DM patients without apparent CVD and indicated that tofogliflozin treatment did not delay the progression of atherosclerosis by monitoring carotid intima-media thickness but lowered arterial stiffness by evaluating the changes in brachial-ankle pulse wave velocity [47-49]. This might be due to limited sample size and study duration [47]. Therefore, increasing the sample size and research duration may provide some clues for whether or not these drugs have an influence on the progression of atherosclerosis.

Effects of SGLT2 inhibitors on atherosclerosis: experimental evidence

Based on the notable cardiovascular benefits conferred by SGLT2i, research interest has been focused on the study of the anti-atherosclerotic effects of SGLT2i in suitable experimental models and several SGLT2i have been shown to ameliorate atherosclerosis in ApoE^-/- mice, Ldlr^-/- mice and rabbits (Table 3).

In the ApoE^-/- mouse model, canagliflozin alleviated atherosclerosis by reducing the expression of monocyte chemoattractant protein-1 (MCP-1) and vascular cell adhesion molecule-1 (VCAM-1), accompanied by decreased levels of total cholesterol, triglyceride and glucose, and it also decreased heart rate, plaque size, and increased plaque stability [50]. Canagliflozin also suppressed lipid synthesis and interleukin (IL)-1β levels in ApoE^-/- mice [51]. Similarly, luseogliflozin treatment inhibited the expression of intercellular cell adhesion molecule-1 (ICAM-1), IL-1β, IL-6, and tumor necrosis factor-α (TNF-α) [52]. Luseogliflozin treatment reduced macrophage accumulation in perivascular adipose tissue and reduced neointimal hyperplasia [53]. Ipragliflozin exerted similar actions (suppressed macrophage accumulation, reduced fibrosis and adipocyte death) [54]. Empagliflozin reduced the levels of CD68, MCP-1, ICAM-1, TNF-α and nicotinamide adenine dinucleotide phosphate (NADPH) oxidase subunits and thereby ameliorated diabetes-induced endothelial dysfunction [55]. Moreover, several studies have indicated that empagliflozin increased tissue inhibitor of metalloproteinase (TIMP)/matrix metalloproteinase-2 (MMP-2) ratio and increased collagen content of developing plaques, rendering the plaques more stable [50, 56]. After empagliflozin treatment, the atherosclerotic plaque area was smaller, and the inflammatory cell infiltration in adipose tissue was reduced [57]. A further study indicated that empagliflozin reduced angiotensin II-induced neovessel formation and macrophage infiltration in the abdominal aortic aneurysm lesions in ApoE^-/- mice [58]. In addition, empagliflozin treatment also exerted atheroprotection by inhibiting the renin-angiotensin-aldosterone system and sympathetic activity [59]. In hyperglycemic STZ-diabetic mice, empagliflozin also reduced atherosclerotic plaques [60]. Another study used ApoE^-/- mice as a model of non-proteinuric diabetic kidney disease and found that empagliflozin treatment inhibited the development of aortic atherosclerosis and increased ketone body levels [61]. Moreover, dapagliflozin treatment attenuated atherosclerosis, reduced macrophage infiltration, and enhanced plaque stability [62, 63]. Similar results were obtained after ipragliflozin treatment [62]. However, a study in ApoE^-/-Irs2^+/- mice indicated that dapagliflozin did not protect against the development of atherosclerosis in insulin-resistant mice under hypercholesterolemic conditions [64].

As dyslipidemia is an independent risk factor for atherosclerosis [65], it is also important to study how glycemic control affects the development of atherosclerosis in the presence of hyperlipidemia. Effective glycemic control with dapagliflozin not only reduced atherosclerosis, but also ameliorated plasma lipoprotein profiles in Ldlr^-/- mice [66]. The benefits of dapagliflozin on atherosclerosis have also been demonstrated in experimental animals other than mice. For example, in a rabbit model of atherosclerosis, dapagliflozin was found to exhibit anti-atherosclerotic effects by modulating inflammatory responses (decreased expression of TNF-α, IL-1β, and IL-6) and macrophage polarization (toward M2 macrophages) under non-diabetic conditions [67].

 Figure 1 

Potential molecular targets of SGLT2i in atherosclerosis. Although the existing evidence is not sufficient to directly prove the anti-atherosclerotic mechanism of action of SGLT2i, some preclinical and clinical studies have revealed some potential mechanisms. SGLT2i may inhibit the progression of atherosclerosis by impacting the levels of related inflammatory factors in the serum, inhibiting endothelial dysfunction, VSMC proliferation and migration, macrophage inflammation, foam cell formation, platelet activation, and oxidative stress and improve autophagy impairment. Abbreviations: ABCA1: ATP-binding cassette transporter A1; ACAT1: acetyl-coenzyme A acetyltransferase 1; AGEs: advanced glycation end-products; AMPK: AMP-activated protein kinase; BHB: β-hydroxybutyrate; HbA1c: glycosylated hemoglobin; eNOS; endothelial nitric oxide synthases; HO-1: hemeoxygenase-1; ICAM-1: intercellular cell adhesion molecule-1; IL-1β: interleukin-1β; IL-6: interleukin-6; Lox-1; lectin-like oxidized low-density lipoprotein receptor-1; M1: M1 macrophages; M2: M2 macrophages; MCP-1: monocyte chemoattractant protein-1; NADPH: nicotinamide adenine dinucleotide phosphate; NF-κB: nuclear factor-κB; NLRP3: nucleotide-binding domain-like receptor protein 3; NO: nitric oxide; PAI-1: plasminogen activator inhibitor-1; ROS: reactive oxygen species; SIRT1: sirtuin-1; STAT3: signal transducer and activator of transcription 3; TLR4: toll-like receptors; TNF-α: tumor necrosis factor-α; VCAM-1: vascular cell adhesion molecule-1.

Mechanisms of action of SGLT2 inhibitors

The main mechanism for SGLT2i to exert hypoglycemic effects is to increase the excretion of glucose in urine [10, 68]. However, in diabetic patients, the mechanism of the inhibitory effect of SGLT2i on atherosclerosis, which is the cause of cardiovascular events, remains unclear. The focus of clinical trials is to study the impact of SGLT2i on cardiovascular events, deaths and safety outcomes, but the research on their mechanism is mainly based on preclinical studies. In the past decade, various targets and signaling pathways mediating SGLT2i's cardioprotective actions have been revealed. The potential molecular targets and beneficial effects of SGLT2i on atherosclerosis are discussed as below (Figure 1 and Figure 2).

Improving endothelial dysfunction

Endothelial dysfunction is an initial key event of atherosclerosis and an important contributor to vascular diseases [69, 70]. Substantial evidence showed that SGLT2i ameliorate endothelial dysfunction and improve endothelium-dependent vasodilation. Dapagliflozin regulated glycemic indices, which could improve flow-mediated vasodilation, arterial stiffness and endothelial function in patients with T2DM [71-73].

Several preclinical studies have demonstrated that endothelial dysfunction can be prevented by SGLT2i in different experimental models. Empagliflozin prevented the increased expression of atherothrombotic markers and improved endothelial function in ZSF1 rats that have metabolic syndrome and associated insulin resistance [74]. In this context, empagliflozin treatment decreased aortic stiffness and suppressed endothelial dysfunction by promoting glycosuria in a mouse model of T2DM [75]. Furthermore, empagliflozin attenuated high glucose-induced endothelial senescence and dysfunction by inhibiting the local angiotensin system [76]. Similarly, dapagliflozin reduced arterial stiffness and endothelial dysfunction in diabetic mice and enhanced diastolic function in a non-diabetic model [77, 78]. SGLT2i reversed endothelial activation and endothelial nitric oxide synthases (eNOS) deficit under diabetic conditions [78]. These results are consistent with those of Gaspari et al. [79], who found that dapagliflozin treatment attenuated vascular endothelial cell activation and induced significant endothelium-independent vasorelaxation in ApoE^-/- mice. Importantly, Tahara et al. [80] conducted a comparative experiment to compare the effects of six SGLT2i (luseogliflozin, ipragliflozin, tofogliflozin, empagliflozin, canagliflozin and dapagliflozin) on diabetes-related complications in T2DM mice and determined that all SGLT2i examined prevented the development of endothelial dysfunction suggesting this is a class effect for these agents although the commonality of reduced glycemia cannot be totally excluded.

 Figure 2 

Potential cardiovascular actions of SGLT2i. SGLT2i have pleiotropic cardiovascular protective effects, such as: reduce weight, blood pressure, blood glucose, insulin resistance and glucotoxicity in patients, increases hemoconcentration, and inhibits oxidative stress and inflammation. The most direct effect of SGLT2i is inhibition of the reabsorption of glucose and a diuretic and natriuretic effect. In addition, SGLT2i also exerts other effects such as regulating ion channels, activating autophagy, inhibiting iron overload, attenuating activation of the NLRP3 inflammasome, and inhibiting the signaling of advanced glycation end products. The synergistic effects of these benefits may provide a therapeutic basis for the cardioprotective effects of SGLT2i.

Improving vascular smooth muscle cell dysfunction

Excessive proliferation and migration of vascular smooth muscle cells (VSMCs) as part of the development of the neointima play a crucial role in the pathogenesis of atherosclerosis [81, 82]. In this regard, VSMC growth and migration were significantly blunted in diabetic patients after canagliflozin treatment at clinically relevant doses [83]. Heme oxygenase-1 (HO-1) is a newly discovered target of canagliflozin. Treatment of VSMCs with canagliflozin stimulated HO-1 expression/activity [83].

Combination therapy with ipragliflozin and empagliflozin inhibited VSMC proliferation and the formation of neointima after vascular injury [84]. Furthermore, empagliflozin improved coronary microvascular function and contractile function [85]. Ipragliflozin also had the same actions (inhibiting the proliferation and migration of monocytes and VSMCs in vitro) [54].

Attenuation of macrophage inflammation, foam cell formation, and M1 polarization

Macrophage inflammation, foam cell formation, and M1 polarization are critical events in the development of atherosclerosis [86]. Empagliflozin ameliorated cardiac macrophage infiltration in db/db mice [87]. Similar findings were reported by Pennig et al. [60] using STZ-induced diabetic mice. Glucose-lowering effects conferred by empagliflozin alleviated the proliferation of plaque-resident macrophages and the atherosclerotic plaque size was significantly smaller [60]. In addition, mechanistic studies revealed that empagliflozin reduced the accumulation of M1 polarized macrophages, and redirected the macrophage phenotype toward an anti-inflammatory M2 phenotype, reduced obesity-related chronic inflammation, attenuated insulin resistance, and activated AMP-activated protein kinase (AMPK) [88, 89]. Similarly, canagliflozin directly inhibited the secretion of endothelial pro-inflammatory cytokine (MCP-1 and IL-6) through AMPK-dependent and -independent mechanisms [90]. AMPK activation increased ATP production and reduced ATP consumption [89]. The expression of lectin-like oxidized low-density lipoprotein receptor-1 (Lox-1) and acetyl-coenzyme A acetyltransferase 1 (ACAT1) genes was down-regulated in peritoneal macrophages isolated from diabetic mice receiving dapagliflozin, while the expression of ATP-binding cassette transporter A1 (ABCA1) was up-regulated [63].

In addition, macrophage infiltration into atherosclerotic lesions was reduced by dapagliflozin treatment [63]. In an infarction model in non-diabetic rats, dapagliflozin increased signal transducer and activator of transcription 3 (STAT3) activity, STAT3 nuclear translocation, and M2 macrophage infiltration. [91]. Similar results were reported in a rabbit model, in which dapagliflozin increased M2 macrophages and inhibited toll-like receptor 4/nuclear factor-kappa B signaling pathway which serve as master regulators of inflammatory responses in macrophages [67].

Prevention of platelet activation

Platelet adhesion, activation and aggregation in plaques are key events in atherothrombosis [92]. The reduction in blood glucose by dapagliflozin treatment normalized reticulated platelet levels [93]. Spigoni et al. [94] showed that empagliflozin and dapagliflozin reduced inflammation and oxidative stress and might reduce ADP-stimulated platelet activation. Empagliflozin reduced the plasma concentration of plasminogen activator inhibitor-1 in patients with T2DM, which inhibited the development of thrombotic diseases [95]. Therefore, plaque stabilization and inhibition of thrombosis are the potential mechanisms of SGLT2i-mediated cardiovascular protection [94].

Attenuation of oxidative stress

The development of atherosclerosis is closely related to oxidative stress. SGLT2i reduce oxidative stress in patients, experimental animals, and cultured cells. After SGLT2i treatment, NADPH oxidase subunits (NOX1, NOX2, NOX4, p22phox, and p47phox) were reduced [55, 96-98]. Surrogate parameters of oxidative stress, 3-nitrotyrosine- and hydroxynonenal-positive proteins, were almost normalized [99]. Moreover, parameters of pathological oxidative stress (hydrogen peroxide, 3-nitrotyrosine, lipid peroxide) were attenuated in cardiomyocytes [100] and urinary excretion of 8-hydroxydeoxyguanosine was reduced [97, 101]. Inhibition of oxidative stress restores the bioavailability of NO and explains the vasoprotective benefits of SGLT2i [102]. Kolijn et al. [100] conducted more in-depth mechanistic research and observed that empagliflozin improved endothelial vasorelaxation via reducing pro-inflammatory/pro-oxidative pathways and eNOS-dependent PKGIα (cyclic guanosine monophosphate-dependent protein kinase G Iα) oxidation. SGLT2i improved PAR2 (proteinase-activated receptor 2)-mediated NOS-dependent vasodilation, which is compromised by oxidative stress though an NAPDH oxidase/ROS-dependent signaling pathway [103].

Reduced inflammation

Compared with most current glucose-lowering agents, SGLT2i have actions in reducing tissue inflammation. Evidence in mouse models suggested that SGLT2i inhibited the expression of circulating inflammatory molecules (TNF-α, MCP-1, PECAM-1, VCAM-1, ICAM-1, IL-1β, and IL-6) associated with atherosclerosis [52, 56, 62, 77]. Also, human evidence indicated that canagliflozin might induce changes in TNFR1, IL-6, MMP7, serum leptin, adiponectin and fibronectin 1 [104, 105]. Empagliflozin reduced superoxide production in leukocytes and reduced hs-CRP in patients with T2DM [106]. SGLT2i have the capacity to inhibit inflammation and reverse the adverse factors of atherosclerosis.

Regulation of iron metabolism

Iron metabolism occurs as a complex interplay between iron per se, inflammation and atherosclerosis [107]. Iron overload promotes the formation of highly reactive forms of oxygen free radicals, which accelerates atherosclerosis [108-111]. Serum ferritin is a reliable indicator of iron stores [110, 112]. High transferrin saturation signals iron overload [108]. Recent proteomic findings in plasma of T2DM demonstrated significant decrement in ferritin following empagliflozin treatment [113]. In addition, dapagliflozin treatment significantly reduced circulating hepcidin and ferritin concentrations [114]. Regulating iron metabolism might be one of the novel mechanisms of action of SGLT2i in cardiovascular protection but this area requires more investigation.

Promoting autophagy

Autophagy is related to the clearance of apoptotic macrophages from atherosclerotic plaques [115]. Blocking autophagy renders macrophages more susceptible to cell death and promotes necrosis in advanced atherosclerosis [115]. Canagliflozin inhibited intracellular glucose metabolism and promoted autophagy that might be associated with inhibited 6-phosphofructo-2-kinase (PFK2) expression and increased AMPK phosphorylation [116]. Autophagy is closely related to AMPK and sirtuin-1 (SIRT1). Canagliflozin upregulated the expression of SIRT1 [117]. Similarly, empagliflozin treatment activated AMPK and enhanced cardiac autophagy [118]. Following MI in patients with diabetes, empagliflozin inhibited ROS and restored autophagy to normalize the size and number of mitochondria [119]. Empagliflozin treatment increased the level of mitochondrial SIRT3 and enhanced the activation of TLR9, thereby activating autophagy [120]. Therefore, enhancing autophagy might be a potential mechanism for SGLT2i to exert atheroprotective effects.

Regulation of ion exchange channels

K⁺ channels regulating depolarization/hyperpolarization are the main determinants of vascular tone. The voltage-dependent K⁺ (Kv) channels could be the target of dapagliflozin. The vasodilatory effect of dapagliflozin occured through direct activation of protein kinase G and subsequent activation of Kv channels [121].

Na⁺/H⁺ exchanger 1 (NHE1) in endothelial cells might be another target of SGLT2i. Dapagliflozin inhibited the activity of NHE1 in endothelial cells to reverse endothelial activation [78]. Empagliflozin treatment directly inhibited NHE1 mediated Na⁺ influx, thereby reducing myocardial cytoplasmic Na⁺, regardless of SGLT2 activity [122]. However, the latest research proves that empagliflozin treatment did not inhibit cardiac NHE1 activity [123]. It remains unclear whether SGLT2i affect the progression of atherosclerosis through targeting ion channels.

Increasing ketone bodies

An important feature of diabetic patients treated with SGLT2i is the increase of circulating ketone bodies [124]. Ferrannini et al. [125-127] indicated that increased β-hydroxybutyrate (BHB) promote ketone bodies as metabolic substrates and result in improved energy metabolism of the heart. In addition to the involvement in energy metabolism, other protective effects have been proposed for ketone bodies. For example, preclinical findings demonstrate that BHB has a strong anti-inflammatory effect. Empagliflozin has been reported to significantly increase the abundance of serum BHB leading to inhibition of NLRP3 and reduction of IL-1β levels [128]. The importance of ketone bodies as an adjuster of the benefits of SGLT2i in atherosclerosis remain uncertain.

Reduced body weight

Inhibition of glucose reabsorption leads to calorie loss, accompanied by weight loss [129]. Several meta-analyses of clinical trials in patients with T2DM have suggested that body weight was significantly reduced following SGLT2i treatment [130, 131]. SGLT2i convert glucose metabolism into fatty acids and ketones, and enhance fat utilization that are favorable factors which confer anti-atherosclerotic effects.

Regulation of diuresis, natriuresis, hemoconcentration and blood pressure

SGLT2i have natriuretic and diuretic effects [124]. Induction of diuresis and natriuresis by SGLT2i decrease plasma volume and contribute to systolic and diastolic blood pressure control [132, 133]. Hypertension is a contributing factor to atherosclerosis and its thrombotic complications [1]. Reductions in blood pressure were greater with empagliflozin compared with placebo [134]. Natriuresis also activates the tubuloglomerular feedback response [135]. The synergistic effect of these several mechanisms may provide an indirect but useful basis for the anti-atherosclerotic effects of SGLT2i.

Lowering the level of uric acid

SGLT2i treatment resulted in lower circulating levels of uric acid [136-138]. Uric acid is considered an activator of oxidative stress and inflammation, which induces activation of the NLRP3 inflammasome [124, 139]. Lowering uric acid might be an indirect mechanism of SGLT2i to improve atherosclerosis, and its deeper mechanism remains to be evaluated.

Inhibition of NLRP3 inflammasome

Nucleotide-binding domain-like receptor protein 3 (NLRP3) inflammasome plays a vital role in inflammation and immunity [140]. The activation of NLRP3 inflammasome and the subsequent release of IL-1β and IL-18 contribute to the pathogenesis of atherosclerosis and HF [141-143]. Current research on the effect of SGLT2i on NLRP3 inflammasome is focused on diabetic nephropathy, steatohepatitis, cardiomyopathy and atherosclerosis.

Empagliflozin attenuated the activation of NLRP3 inflammasome in a Ca²⁺-dependent manner [144]. Kim et al. [128] demonstrated that empagliflozin significantly inhibited the activation of NLRP3 inflammasome by increasing serum BHB levels and reducing insulin levels in T2DM and CVD patients, regardless of glycemic control. Dapagliflozin treatment reduced the production of NLRP3 protein and ROS in aortic tissues, thereby partially reversing the formation of atherosclerosis [62]. Dapagliflozin also inhibited the activation of NLRP3 inflammasome by activating AMPK and mTORC2 [145, 146]. In conclusion, SGLT2i attenuates the activation of NLRP3 inflammasome, which might help explain its inhibitory effect on atherosclerosis.

Reduction of advanced glycation end-products

The binding of advanced glycation end-products (AGEs) to endothelial AGE receptors (RAGE) stimulates oxidative stress and expression of cytokines, chemokines, and adhesion molecules [147]. Methylglyoxal, a primary precursor of AGEs, decreased the phosphorylation of eNOS^Ser1177 and protein kinase B (Akt), which inhibited eNOS activity. SGLT2i decreased the levels of methylglyoxal, prevented AGE formation and AGE/RAGE signaling, and ameliorated decreased phosphorylation of eNOS^Ser1177 and Akt, thus conferring atheroprotective effects [96, 97, 101].

Conclusions and perspectives

As a new category of oral hypoglycemic agents, SGLT2i have a specific mechanism of action and target glucose removal which is distinct from other hypoglycemic agents. By increasing the excretion of urinary glucose, SGLT2i regulate glucose levels without an increased risk of hypoglycemic events. A recent observational study suggested that SGLT2i might be more effective than GLP-1RA in ameliorating cardiovascular outcomes of T2DM with comparable rate of adverse events [148]. In addition, SGLT2i significantly decreased the risk of HF or cardiovascular death independent of diabetes status in patients on background therapy for HF [39, 149].

The cardiovascular actions and anti-inflammatory effects of SGLT2i have been excellently reviewed elsewhere [11, 150-153]. Here, we provide a focused review of the protective effects of SGLT2i in different stages of atherosclerosis (the leading cause of CVD), illuminating the molecular targets of this category of drugs in atheroprotection. In patients with diabetes, SGLT2i show cardio-renal protection and have important clinical advantages but there are also some adverse reactions. The most commonly observed adverse effect is polyuria. Empagliflozin increased the risk of urogenital infections in women and men [9]. Another important safety concern, observed in the CANVAS trial, was amputations and fractures of the legs and feet in patients treated with canagliflozin compared with placebo [33]. However, a recent real-world study suggested that the risk of amputations in patients treated with SGLT2i was not higher compared with other anti-diabetic drugs [154]. Also, the application of SGLT2i for patients with type 1 diabetes should be considered with caution due to increased incidence of ketoacidosis and diarrhea [155]. Long-term systemic side effects of SGLT2i are warranted to be evaluated in large-scale randomized controlled trials.

By deepened understanding of the mechanism of action of SGLT2i, the adverse reactions after drug treatments could be reduced. Results of recent clinical trials involving individuals without diabetes might repurpose this drug as “a drug for cardiorenal protection” [156]. Taken together, SGLT2i have broad therapeutic prospects, and their pharmacological mechanisms and precise molecular targets beyond SGLT2 inhibition and glycemic control need to be elucidated in future studies.

Supplementary Material

Supplementary figure.

Acknowledgements

This study was supported by grants from National Natural Science Foundation of China [Grant No's. 82070464 to SX, 81941022 to JW, 81530025 to JW], Program for Innovative Research Team of The First Affiliated Hospital of USTC (to JW), Strategic Priority Research Program of Chinese Academy of Sciences [Grant No. XDB38010100 to JW] and the National Key R&D Program of China [Grant No. 2017YFC1309603 to JW]. This work was also supported by Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01S131], China International Medical Foundation (to XZ), Natural Science Foundation of Anhui Province [Grant No. 006223066002 to SL].

Competing Interests

The authors have declared that no competing interest exists.

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Author contact

Corresponding authors: Suowen Xu, PhD, E-mail: sxu1984edu.cn; ORCID: 0000-0002-5488-5217; Jianping Weng, MD, PhD, E-mail: wengjpedu.cn; ORCID: 0000-0002-7889-1697.

Received 2020-10-14
Accepted 2021-1-17
Published 2021-3-4

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