Editorial Open Access
Copyright ©The Author(s) 2024. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Diabetes. Aug 15, 2024; 15(8): 1677-1682
Published online Aug 15, 2024. doi: 10.4239/wjd.v15.i8.1677
Diabetic cardiomyopathy: Emerging therapeutic options
Cornelius James Fernandez, Department of Endocrinology & Metabolism, Pilgrim Hospital, United Lincolnshire Hospitals NHS Trust, Boston PE21 9QS, United Kingdom
Sahana Shetty, Department of Endocrinology, Kasturba Medical College, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India
Joseph M Pappachan, Department of Endocrinology and Metabolism, Lancashire Teaching Hospitals NHS Trust, Preston PR2 9HT, United Kingdom
Joseph M Pappachan, Faculty of Science, Manchester Metropolitan University, Manchester M15 6BH, United Kingdom
Joseph M Pappachan, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester M13 9PL, United Kingdom
ORCID number: Cornelius James Fernandez (0000-0002-1171-5525); Sahana Shetty (0000-0003-0851-0411); Joseph M Pappachan (0000-0003-0886-5255).
Author contributions: Fernandez CJ wrote the initial draft of the manuscript with some help from Shetty S and Pappachan JM by performing literature search, interpretation of relevant scientific data, and compiling the best evidence; Fernandez CJ and Shetty S also contributed to the critical revision, important intellectual content and figure preparation for the paper; Pappachan JM contributed to the conceptual design of the paper and provided additional input to the drafting, literature review, revision, and modifications of the paper; and all authors have read and approved the final version of the manuscript.
Conflict-of-interest statement: The authors declare that they have no conflict of interest to disclose.
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: https://creativecommons.org/Licenses/by-nc/4.0/
Corresponding author: Sahana Shetty, MD, DM, Professor, Senior Researcher, Department of Endocrinology, Kasturba Medical College, Manipal Academy of Higher Education, Madhav Nagar, Manipal 576104, Karnataka, India. sahana.shetty@manipal.edu
Received: March 30, 2024
Revised: May 4, 2024
Accepted: May 20, 2024
Published online: August 15, 2024
Processing time: 117 Days and 11.1 Hours

Abstract

Diabetic cardiomyopathy (DbCM) is a common but underrecognized compli-cation of patients with diabetes mellitus (DM). Although the pathobiology of other cardiac complications of diabetes such as ischemic heart disease and cardiac autonomic neuropathy are mostly known with reasonable therapeutic options, the mechanisms and management options for DbCM are still not fully understood. In its early stages, DbCM presents with diastolic dysfunction followed by heart failure (HF) with preserved ejection fraction that can progress to systolic dysfunction and HF with reduced ejection fraction in its advanced stages unless appropriately managed. Apart from prompt control of DM with lifestyle changes and antidiabetic medications, disease-modifying therapy for DbCM includes prompt control of hypertension and dyslipidemia inherent to patients with DM as in other forms of heart diseases and the use of treatments with proven efficacy in HF. A basic study by Zhang et al, in a recent issue of the World Journal of Diabetes elaborates the potential pathophysiological alterations and the therapeutic role of teneligliptin in diabetic mouse models with DbCM. Although this preliminary basic study might help to improve our understanding of DbCM and offer a potential new management option for patients with the disease, the positive results from such animal models might not always translate to clinical practice as the pathobiology of DbCM in humans could be different. However, such experimental studies can encourage more scientific efforts to find a better solution to treat patients with this enigmatic disease.

Key Words: Diabetic cardiomyopathy; Diabetic cardiomyopathy; Heart failure; Pathobiology; Teneligliptin

Core Tip: Diabetic cardiomyopathy (DbCM) is a common and underrecognized complication of diabetes mellitus. The pathobiological mechanisms of DbCM are not fully elusive and the therapeutic options are not adequate. Stages of DbCM include diastolic dysfunction followed by heart failure (HF) with preserved ejection fraction, systolic dysfunction and HF with reduced ejection fraction in its order of progression. Zhang et al, in a recent issue of the World Journal of Diabetes, demonstrate the potential pathophysiological changes of DbcM and explore the therapeutic potential of teneligliptin in mouse models of DbCM. Such experimental models might harness better research efforts to find an appropriate therapeutic strategy for DbCM in the near future.



INTRODUCTION

Heart disease is the most common cause of mortality in patients with diabetes mellitus (DM). Diabetic cardiac diseases comprise ischemic heart disease (IHD), cardiac autonomic neuropathy (CAN) and diabetic cardiomyopathy (DbCM)[1]. Although the first 2 forms are well-known, DbCM is not that familiar to most clinicians. The risk of hospitalization for heart failure (HF) is two-fold higher in those with DM than in nondiabetics, and diabetes is identified as an independent risk factor for worse clinical HF outcomes, including a greater decline in left ventricular ejection fraction over time[2]. DbCM, the most important cause of both diastolic and systolic HF in patients with DM, is associated with significantly higher morbidity and mortality risk.

Although there are very good treatment options for diabetics with IHD resulting from coronary artery disease (CAD) to improve the clinical and mortality outcomes, the treatment options for patients with DbCM are mostly symptom control measures. The main reason is the lack of therapeutic avenues targeting the pathobiological mechanisms involved in the development of DbCM. Therapeutics targeting the pathophysiological abnormalities of DbCM are being explored now. The therapies addressing the underlying aetiopathogenesis with the potential to reduce adverse cardiovascular outcomes and mortality are the need of the hour. A basic study by Zhang et al[3] in the recent issue of the World Journal of Diabetes that reveals the beneficial effect of teneligliptin in improving the disease process in mouse models of DbCM, is an example of treatment options targeting the pathobiological processes of DbCM. This editorial briefly discusses the pathobiology and emerging therapeutic options for patients with DbCM.

DISEASE EPIDEMIOLOGY

DbCM is defined as the structural, functional, and metabolic myocardial changes that result in HF in the absence of CAD, valvular heart disease and conventional cardiovascular risk factors such as hypertension and dyslipidaemia[4]. The resultant HF can either be HF with preserved ejection fraction (HFpEF; approximately 2/3rd of DbCM cases) or HF with reduced ejection fraction (HFrEF; approximately 1/3rd of DbCM)[4]. The prevalence of DbCM among community-dwelling adults with diabetes varied between 67.0% when the least restrictive criteria for diagnosis were used to 11.7% when the most restrictive criteria were used[5]. DbCM is associated with a high risk of incident HF with the highest risk when the most restrictive criteria are used [hazard ratio (HR): 2.55; 95% confidence interval (CI): 1.69-3.86] and the lowest risk when the least restrictive criteria are used (HR: 1.99; 95%CI: 1.50-2.65)[5]. These figures clearly explain the higher prevalence of incident HF at any point in time among patients with DM.

PATHOBIOLOGY OF DbCM

Although not fully elusive, multiple metabolic, structural, and functional alterations have been identified in the etiopathogenesis of DbCM. The pathobiological changes associated with the onset and progression of DbCM include chronic hyperglycemia, insulin resistance, hyperinsulinemia, alterations in the pathways controlling intracellular myocardial energy metabolism, increased myocardial fatty acid oxidation (and the consequent mitochondrial dysfunction); ceramide and diacylglycerol accumulation (with cardiomyocyte lipo-apoptosis), increased reactive oxygen species formation (cardiac oxidative stress), increased generation of advanced glycation end products (AGE) (with nuclear factor-κB mediated inflammation), impaired calcium handling and apoptosis (from mitochondrial dysfunction, and endoplasmic reticulum stress), altered mitochondrial bioenergetics, overactivation of the renin-angiotensin-aldosterone systems (RAAS), impaired nitric oxide and endothelium-derived hyperpolarising factor-mediated vasodilation (leading to microvascular dysfunction), and exosome dysregulation (cardiomyocyte apoptosis)[1,4,6]. Structural changes associated with the pathogenesis of DbCM include myocardial hypertrophy, fibrosis, ischemia, and adverse cardiac remodelling[1,4,6]. Functional changes associated with the pathogenesis of DbCM include the development of diastolic dysfunction, HFpEF, systolic dysfunction, and subsequently HFrEF[1,4,6].

DIAGNOSTIC ASPECTS

The clinical features, structural changes, functional changes, and biomarkers are not specific enough to accurately diagnose DbCM. Cardiac remodelling is an important feature of DbCM, and various imaging tools used to diagnose cardiac remodelling include echocardiography, cardiac computed tomography (CT), magnetic resonance imaging (MRI), and nuclear imaging techniques[7]. These non-invasive tools can detect changes in myocardial mass, wall thickness and perfusion as indicators of diastolic dysfunction which is the key feature of early stages of DbCM[7].

While 2-D echocardiography can provide details regarding structural changes of DbCM, tissue doppler imaging can provide details regarding functional changes (E/e’ velocity and mitral annular velocity)[7,8]. Dilated left atrium (LA) is an early feature that supports the diagnosis of DbCM. Apart from the LA volume index, 2-D speckle tracking echocardiography provides a measurement of the LA contractile strain rate. Contrast-enhanced cardiac MRI can provide details regarding structural changes (myocardial fibrosis, steatosis, and left ventricular mass), functional changes (diastolic and systolic function), and metabolic changes (MR spectroscopy for myocardial triglyceride content and high-energy phosphate metabolism). In addition to providing a more accurate measurement of LA size over echocardiography, the cardiac MRI can evaluate LA ejection fraction. Similarly, cardiac CT can measure LA total emptying fraction (LATEF) as a measure of global LA function. As CAN is an independent risk factor of DbCM, decreased 123I-MIBG (Iodine-123 metaiodobenzylguanidine) activity can be seen in patients with DbCM[7].

Although the most definitive evidence of diastolic dysfunction is obtainable from cardiac catheterisation studies, it is rarely needed due to the availability of various highly sensitive and specific non-invasive tests. Investigational bio-markers of structural changes are matrix metalloproteinase (MMP) and tissue inhibitor of matrix metalloproteinase (for myocardial fibrosis); and of functional changes include mi-RNA (for contractile function), procollagen 3 N-terminal peptide and troponin (for LV dysfunction), and BNP (brain natriuretic peptide) for LV diastolic and systolic function[1]. Figure 1 shows the metabolic, functional and structural changes in the heart that lead to DbCM.

Figure 1
Figure 1 The metabolic, structural, and functional changes in the heart leading to the development of diabetic cardiomyopathy. Ca2+: Calcium; HFpEF: Heart failure with preserved ejection fraction; HFrEF: Heart failure with reduced ejection fraction.
PROGNOSIS

Initial stages of DbCM are clinically silent and are characterized by structural and functional changes including myocardial hypertrophy, myocardial interstitial fibrosis, and myocardial stiffness[9]. These changes are associated with subclinical diastolic dysfunction, which later evolves into HFpEF and eventually systolic dysfunction accompanied by HFrEF. Early detection and treatment of DbCM are important for preventing the onset and progression of myocardial fibrosis, the irreversible stage of the disease.

THERAPEUTIC INTERVENTIONS

Reversing adverse cardiac remodelling of DbCM is challenging and often needs a multi-faceted approach. The best approach to reverse the cardiac remodelling of DbCM is through lifestyle modifications (regular exercise, restricted fat and refined carbohydrate consumption aiming to improve the body weight and metabolic functions), and through drugs that improve systemic and tissue level insulin sensitivity, myocardial glucose uptake and myocardial function[10,11]. For example, metformin acting via the adenosine monophosphate-activated protein kinase (AMPK) pathway and thiazolidinediones acting via peroxisome proliferator-activated receptor gamma(PPAR-γ) modulate insulin sensitivity and myocardial metabolism. In addition, optimising the cholesterol levels and blood pressure is also important[10,11].

Apart from glycaemic control and weight reduction, the glucagon-like peptide 1 receptor agonists exhibit antifibrotic properties by activating the AMPK pathway, reducing the endoplasmic reticulum stress, and inhibiting the expression of type I/III collagen and MMPs, thereby preventing the development of DbCM. Dipeptidyl peptidase-4 (DPP-4) inhibitors could also prevent myocardial hypertrophy and diastolic dysfunction by inhibiting oxidative stress and myocardial fibrosis[10,11].

Sodium-glucose cotransporter 2 (SGLT2) inhibitors are also promising drugs in the treatment of DbCM. They enhance sodium excretion and decrease cardiac preload and afterload, thereby improving cardiac output. SGLT2 inhibitors inhibit myocardial fibroblast activation by blocking the transforming growth factor-β (TGF-β)/SMAD signalling pathway[10,11]. SGLT2 inhibitors inhibit the cytosolic sodium-hydrogen (Na+-H+) pump, decrease intracellular calcium and thereby myocardial injury, hypertrophy, and fibrosis. Cardio-protection by SGLT2 inhibitors is also mediated by raised β-hydroxybutyric acid production (increasing the mitochondrial metabolism) and uric acid excretion[10,11].

Drugs with proven efficacy for HFrEF to reverse LV remodelling via inhibition of RAAS such as angiotensin convertase enzyme inhibitors, angiotensin receptor blockers, and aldosterone antagonists may also be of value in the treatment of HFpEF mediated by DbCM by inhibiting the development of inflammatory and fibrotic responses[10,11]. Similarly, β-blockers reduce myocardial oxygen consumption, improve cardiac metabolism, and reduce myocardial hypertrophy, apoptosis, and fibrosis. Spironolactone could reduce myocardial oxidative stress, inflammatory response, and fibrosis[10,11].

As multiple mechanisms are involved in the pathogenesis of DbCM, the current treatments are not fully effective in the prevention and treatment of DbCM. Many potential therapies are in the preliminary stages of development including sphingosine-1-phosphate modulators, AGE inhibitors, aldose reductase inhibitors, N-acetylcysteine, nicorandil, Nesfatin-1, Schisandrin B, Paeonol, Piceatannol, and flavonoids which are tailored towards different specific pathways[10-12]. On the other hand, gene therapy and stem cell therapy could intervene in the root cause of the disease and might achieve long-term beneficial effects with the potential to reverse myocardial fibrosis[10].

TENELIGLIPTIN AS A POTENTIAL THERAPEUTIC AGENT IN DbCM

Various types of programmed cell death (apoptosis, pyroptosis, necroptosis, and ferroptosis) are involved in the clearance of cells that lost their function, have an infection, or are affected by neoplasms. Pyroptosis, a highly inflammatory mode of apoptosis, is involved in the pathogenesis of atherosclerosis, ischemia-reperfusion injury, and DbCM. Chronic hyperglycaemia-induced reactive oxygen species (ROS) formation activates NOD-like receptor protein 3 (NLRP3) inflammasome which in turn activates downstream molecules to cause membrane rupture characteristic of pyroptosis and produce pro-inflammatory cytokines[13]. As NLRP3 inflammasome participates in the cardiomyocyte pyroptosis of DbCM, NLRP3 is upregulated in DbCM and the level of NLRP3 correlates with ROS generation. By inhibiting ROS generation, NLRP3 gets inactivated. Thus, NLRP3 is a critical target for treating DbCM. Many diabetic medications including metformin, thiazolidinediones, SGLT2 inhibitors and DPP-4 inhibitors improve DbCM by inhibiting the NLRP3 inflammasome activation[13].

The experimental study by Zhang et al[3] in a recent issue of the World Journal of Diabetes uncovers the potential benefits of the DPP-4 inhibitor teneligliptin in the prevention of DbCM in a diabetic mouse model. The following observations were made by the researchers: In streptozotocin-induced diabetic mice, teneligliptin could ameliorate myocardial hypertrophy and improve heart function. The study also observed that the drug could reduce the activation of NLRP3 inflammasome and the resultant myocardial injury. Finally, the drug increased the AMPK phosphorylation in the hyperglycaemia-induced cardiomyocytes and its beneficial effects on hyperglycaemia-induced cardiomyocytes were abolished by AMPK inhibition, suggesting that the effect of teneligliptin on DbCM is also regulated by AMPK.

This study also sheds light on one of the pathobiological mechanisms of DbCM and the great potential for the prevention and management of this dreaded disease with a readily available therapeutic option used for treating patients with type 2 DM for several years. The study would evoke enthusiasm among researchers in further evaluating the potential role of other DPP-4 inhibitors in the prevention and management of DbCM. However, we should be mindful of the lack of significant benefits of several translational experimental models in our day-to-day clinical practice. Therefore, the small experimental data published by Zhang et al[13] needs further validation in larger laboratory models and human beings to ensure the reproducibility of the positive results to compile clearer scientific evidence.

Moreover, we should also consider the reports on higher hospitalisation risk with some of the DPP-4 inhibitors in patients with advanced HF[14,15]. Real-world cohort studies including retrospective data analysis and randomised controlled trials investigating the use of DPP-4 inhibitors at various stages of DbCM may help us to explore the benefits and risks posed by these drugs shortly.

CONCLUSION

DbCM is a common, serious and underrecognized complication of DM, the pathobiological mechanisms of which are still not fully elusive. Present evidence suggests that several disease processes are involved in its causation and some available therapeutic avenues for prevention and management of DbCM with the currently available medications. However, there are still great knowledge gaps regarding the pathobiology and treatment options targeting DbCM. More research input is imperative for shedding light on our understanding of the mechanisms and management strategies of this disease. The study by Zhang et al[3], published in the World Journal of Diabetes is one such remarkable attempt. However, more experimental and clinical data with DPP-4 inhibitors in DbCM are necessary to affirm their study findings.

ACKNOWLEDGEMENTS

We thank Dr. Marina George Kudiyirickal for providing the voice clip for the audio core tip of this article.

Footnotes

Provenance and peer review: Invited article; Externally peer reviewed.

Peer-review model: Single blind

Specialty type: Endocrinology and metabolism

Country of origin: United Kingdom

Peer-review report’s classification

Scientific Quality: Grade C

Novelty: Grade B

Creativity or Innovation: Grade B

Scientific Significance: Grade B

P-Reviewer: Teragawa H, Japan S-Editor: Chen YL L-Editor: A P-Editor: Chen YX

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