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Li DK, Smith LE, Rookyard AW, Lingam SJ, Koay YC, McEwen HP, Twigg SM, Don AS, O'Sullivan JF, Cordwell SJ, White MY. Multi-omics of a pre-clinical model of diabetic cardiomyopathy reveals increased fatty acid supply impacts mitochondrial metabolic selectivity. J Mol Cell Cardiol 2021; 164:92-109. [PMID: 34826416 DOI: 10.1016/j.yjmcc.2021.11.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 11/05/2021] [Accepted: 11/09/2021] [Indexed: 02/07/2023]
Abstract
The incidence of type 2 diabetes (T2D) is increasing globally, with long-term implications for human health and longevity. Heart disease is the leading cause of death in T2D patients, who display an elevated risk of an acute cardiovascular event and worse outcomes following such an insult. The underlying mechanisms that predispose the diabetic heart to this poor prognosis remain to be defined. This study developed a pre-clinical model (Rattus norvegicus) that complemented caloric excess from a high-fat diet (HFD) and pancreatic β-cell dysfunction from streptozotocin (STZ) to produce hyperglycaemia, peripheral insulin resistance, hyperlipidaemia and elevated fat mass to mimic the clinical features of T2D. Ex vivo cardiac function was assessed using Langendorff perfusion with systolic and diastolic contractile depression observed in T2D hearts. Cohorts representing untreated, individual HFD- or STZ-treatments and the combined HFD + STZ approach were used to generate ventricular samples (n = 9 per cohort) for sequential and integrated analysis of the proteome, lipidome and metabolome by liquid chromatography-tandem mass spectrometry. This study found that in T2D hearts, HFD treatment primed the metabolome, while STZ treatment was the major driver for changes in the proteome. Both treatments equally impacted the lipidome. Our data suggest that increases in β-oxidation and early TCA cycle intermediates promoted rerouting via 2-oxaloacetate to glutamate, γ-aminobutyric acid and glutathione. Furthermore, we suggest that the T2D heart activates networks to redistribute excess acetyl-CoA towards ketogenesis and incomplete β-oxidation through the formation of short-chain acylcarnitine species. Multi-omics provided a global and comprehensive molecular view of the diabetic heart, which distributes substrates and products from excess β-oxidation, reduces metabolic flexibility and impairs capacity to restore high energy reservoirs needed to respond to and prevent subsequent acute cardiovascular events.
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Affiliation(s)
- Desmond K Li
- Charles Perkins Centre, The University of Sydney, Camperdown, Australia; School of Medical Sciences, The University of Sydney, Camperdown, Australia
| | - Lauren E Smith
- Charles Perkins Centre, The University of Sydney, Camperdown, Australia; School of Medical Sciences, The University of Sydney, Camperdown, Australia
| | - Alexander W Rookyard
- Charles Perkins Centre, The University of Sydney, Camperdown, Australia; School of Life and Environmental Sciences, Camperdown, The University of Sydney, Australia
| | - Shivanjali J Lingam
- Charles Perkins Centre, The University of Sydney, Camperdown, Australia; School of Medical Sciences, The University of Sydney, Camperdown, Australia
| | - Yen C Koay
- Charles Perkins Centre, The University of Sydney, Camperdown, Australia; Sydney Medical School, The University of Sydney, Camperdown, Australia; Heart Research Institute, Newtown, Australia
| | - Holly P McEwen
- Charles Perkins Centre, The University of Sydney, Camperdown, Australia; Centenary Institute, The University of Sydney, Camperdown, Australia
| | - Stephen M Twigg
- Charles Perkins Centre, The University of Sydney, Camperdown, Australia; Sydney Medical School, The University of Sydney, Camperdown, Australia; Department of Endocrinology, Royal Prince Alfred Hospital, Camperdown, Australia
| | - Anthony S Don
- Charles Perkins Centre, The University of Sydney, Camperdown, Australia; School of Medical Sciences, The University of Sydney, Camperdown, Australia; Centenary Institute, The University of Sydney, Camperdown, Australia
| | - John F O'Sullivan
- Charles Perkins Centre, The University of Sydney, Camperdown, Australia; Sydney Medical School, The University of Sydney, Camperdown, Australia; Heart Research Institute, Newtown, Australia; Department of Cardiology, Royal Prince Alfred Hospital, Camperdown, Australia
| | - Stuart J Cordwell
- Charles Perkins Centre, The University of Sydney, Camperdown, Australia; School of Medical Sciences, The University of Sydney, Camperdown, Australia; School of Life and Environmental Sciences, Camperdown, The University of Sydney, Australia; Sydney Mass Spectrometry, The University of Sydney, Camperdown, Australia
| | - Melanie Y White
- Charles Perkins Centre, The University of Sydney, Camperdown, Australia; School of Medical Sciences, The University of Sydney, Camperdown, Australia.
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Lamberts RR, Lingam SJ, Wang HY, Bollen IAE, Hughes G, Galvin IF, Bunton RW, Bahn A, Katare R, Baldi JC, Williams MJA, Saxena P, Coffey S, Jones PP. Impaired relaxation despite upregulated calcium-handling protein atrial myocardium from type 2 diabetic patients with preserved ejection fraction. Cardiovasc Diabetol 2014; 13:72. [PMID: 24708792 PMCID: PMC3997226 DOI: 10.1186/1475-2840-13-72] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Accepted: 03/26/2014] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Diastolic dysfunction is a key factor in the development and pathology of cardiac dysfunction in diabetes, however the exact underlying mechanism remains unknown, especially in humans. We aimed to measure contraction, relaxation, expression of calcium-handling proteins and fibrosis in myocardium of diabetic patients with preserved systolic function. METHODS Right atrial appendages from patients with type 2 diabetes mellitus (DM, n = 20) and non-diabetic patients (non-DM, n = 36), all with preserved ejection fraction and undergoing coronary artery bypass grafting (CABG), were collected. From appendages, small cardiac muscles, trabeculae, were isolated to measure basal and β-adrenergic stimulated myocardial function. Expression levels of calcium-handling proteins, sarcoplasmic reticulum Ca2+ ATPase (SERCA2a) and phospholamban (PLB), and of β1-adrenoreceptors were determined in tissue samples by Western blot. Collagen deposition was determined by picro-sirius red staining. RESULTS In trabeculae from diabetic samples, contractile function was preserved, but relaxation was prolonged (Tau: 74 ± 13 ms vs. 93 ± 16 ms, non-DM vs. DM, p = 0.03). The expression of SERCA2a was increased in diabetic myocardial tissue (0.75 ± 0.09 vs. 1.23 ± 0.15, non-DM vs. DM, p = 0.007), whereas its endogenous inhibitor PLB was reduced (2.21 ± 0.45 vs. 0.42 ± 0.11, non-DM vs. DM, p = 0.01). Collagen deposition was increased in diabetic samples. Moreover, trabeculae from diabetic patients were unresponsive to β-adrenergic stimulation, despite no change in β1-adrenoreceptor expression levels. CONCLUSIONS Human type 2 diabetic atrial myocardium showed increased fibrosis without systolic dysfunction but with impaired relaxation, especially during β-adrenergic challenge. Interestingly, changes in calcium-handling protein expression suggests accelerated active calcium re-uptake, thus improved relaxation, indicating a compensatory calcium-handling mechanism in diabetes in an attempt to maintain diastolic function at rest despite impaired relaxation in the diabetic fibrotic atrial myocardium. Our study addresses important aspects of the underlying mechanisms of diabetes-associated diastolic dysfunction, which is crucial to developing new therapeutic treatments.
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Affiliation(s)
- Regis R Lamberts
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
| | - Shivanjali J Lingam
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
| | - Heng-Yu Wang
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
| | - Ilse AE Bollen
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
| | - Gillian Hughes
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
| | - Ivor F Galvin
- Department of Cardiothoracic Surgery, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Richard W Bunton
- Department of Cardiothoracic Surgery, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Andrew Bahn
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
| | - Rajesh Katare
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
| | - J Chris Baldi
- Department of Medicine – HeartOtago, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Michael JA Williams
- Department of Medicine – HeartOtago, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Pankaj Saxena
- Department of Cardiothoracic Surgery, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Sean Coffey
- Department of Medicine – HeartOtago, Dunedin School of Medicine, Dunedin Hospital, Dunedin, New Zealand
| | - Peter P Jones
- Department of Physiology - HeartOtago, Otago School of Medical Sciences, University of Otago, Dunedin, New Zealand
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