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Verhulst CEM, van Heck JIP, Fabricius TW, Stienstra R, Teerenstra S, McCrimmon RJ, Tack CJ, Pedersen-Bjergaard U, de Galan BE. The impact of prior exposure to hypoglycaemia on the inflammatory response to a subsequent hypoglycaemic episode. Cardiovasc Diabetol 2024; 23:55. [PMID: 38331900 PMCID: PMC10854178 DOI: 10.1186/s12933-023-02095-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Accepted: 12/12/2023] [Indexed: 02/10/2024] Open
Abstract
BACKGROUND Hypoglycaemia has been shown to induce a systemic pro-inflammatory response, which may be driven, in part, by the adrenaline response. Prior exposure to hypoglycaemia attenuates counterregulatory hormone responses to subsequent hypoglycaemia, but whether this effect can be extrapolated to the pro-inflammatory response is unclear. Therefore, we investigated the effect of antecedent hypoglycaemia on inflammatory responses to subsequent hypoglycaemia in humans. METHODS Healthy participants (n = 32) were recruited and randomised to two 2-h episodes of either hypoglycaemia or normoglycaemia on day 1, followed by a hyperinsulinaemic hypoglycaemic (2.8 ± 0.1 mmol/L) glucose clamp on day 2. During normoglycaemia and hypoglycaemia, and after 24 h, 72 h and 1 week, blood was drawn to determine circulating immune cell composition, phenotype and function, and 93 circulating inflammatory proteins including hs-CRP. RESULTS In the group undergoing antecedent hypoglycaemia, the adrenaline response to next-day hypoglycaemia was lower compared to the control group (1.45 ± 1.24 vs 2.68 ± 1.41 nmol/l). In both groups, day 2 hypoglycaemia increased absolute numbers of circulating immune cells, of which lymphocytes and monocytes remained elevated for the whole week. Also, the proportion of pro-inflammatory CD16+-monocytes increased during hypoglycaemia. After ex vivo stimulation, monocytes released more TNF-α and IL-1β, and less IL-10 in response to hypoglycaemia, whereas levels of 19 circulating inflammatory proteins, including hs-CRP, increased for up to 1 week after the hypoglycaemic event. Most of the inflammatory responses were similar in the two groups, except the persistent pro-inflammatory protein changes were partly blunted in the group exposed to antecedent hypoglycaemia. We did not find a correlation between the adrenaline response and the inflammatory responses during hypoglycaemia. CONCLUSION Hypoglycaemia induces an acute and persistent pro-inflammatory response at multiple levels that occurs largely, but not completely, independent of prior exposure to hypoglycaemia. Clinical Trial information Clinicaltrials.gov no. NCT03976271 (registered 5 June 2019).
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Affiliation(s)
- Clementine E M Verhulst
- Department of Internal Medicine, Radboud University Medical Centre, P.O. box 9101, 6500 HB, Nijmegen, The Netherlands
| | - Julia I P van Heck
- Department of Internal Medicine, Radboud University Medical Centre, P.O. box 9101, 6500 HB, Nijmegen, The Netherlands.
| | - Therese W Fabricius
- Department of Endocrinology and Nephrology, Nordsjællands Hospital, Hillerød, Denmark
| | - Rinke Stienstra
- Department of Internal Medicine, Radboud University Medical Centre, P.O. box 9101, 6500 HB, Nijmegen, The Netherlands
- Division of Human Nutrition and Health, Wageningen University, Wageningen, The Netherlands
| | - Steven Teerenstra
- Section Biostatistics, Department for Health Evidence, Radboud Institute for Health Sciences, Radboudumc, Nijmegen, The Netherlands
| | | | - Cees J Tack
- Department of Internal Medicine, Radboud University Medical Centre, P.O. box 9101, 6500 HB, Nijmegen, The Netherlands
| | - Ulrik Pedersen-Bjergaard
- Department of Endocrinology and Nephrology, Nordsjællands Hospital, Hillerød, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Hillerød, Denmark
| | - Bastiaan E de Galan
- Department of Internal Medicine, Radboud University Medical Centre, P.O. box 9101, 6500 HB, Nijmegen, The Netherlands
- Department of Internal Medicine, Maastricht University Medical Centre, MUMC+, Maastricht, The Netherlands
- CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands
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2
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Verhulst CEM, van Heck JIP, Fabricius TW, Stienstra R, Teerenstra S, McCrimmon RJ, Tack CJ, Pedersen-Bjergaard U, de Galan BE. Hypoglycaemia induces a sustained pro-inflammatory response in people with type 1 diabetes and healthy controls. Diabetes Obes Metab 2023; 25:3114-3124. [PMID: 37485887 DOI: 10.1111/dom.15205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 05/29/2023] [Accepted: 06/05/2023] [Indexed: 07/25/2023]
Abstract
AIM To determine the duration and the extension of the pro-inflammatory response to hypoglycaemia both in people with type 1 diabetes and healthy controls. MATERIALS AND METHODS Adults with type 1 diabetes (n = 47) and matched controls (n = 16) underwent a hyperinsulinaemic-euglycaemic hypoglycaemic (2.8 ± 0.1 mmoL/L [49.9 ± 2.3 mg/dL]) glucose clamp. During euglycaemia, hypoglycaemia, and 1, 3 and 7 days later, blood was drawn to determine immune cell phenotype, monocyte function and circulating inflammatory markers. RESULTS Hypoglycaemia increased lymphocyte and monocyte counts, which remained elevated for 1 week. The proportion of CD16+ monocytes increased and the proportion of CD14+ monocytes decreased. During hypoglycaemia, monocytes released more tumour necrosis factor-α and interleukin-1β, and less interleukin-10, after ex vivo stimulation. Hypoglycaemia increased the levels of 19 circulating inflammatory proteins, including high sensitive C-reactive protein, most of which remained elevated for 1 week. The epinephrine peak in response to hypoglycaemia was positively correlated with immune cell number and phenotype, but not with the proteomic response. CONCLUSIONS Overall, despite differences in prior exposure to hypoglycaemia, the pattern of the inflammatory responses to hypoglycaemia did not differ between people with type 1 diabetes and healthy controls. In conclusion, hypoglycaemia induces a range of pro-inflammatory responses that are sustained for at least 1 week in people with type 1 diabetes and healthy controls.
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Affiliation(s)
- Clementine E M Verhulst
- Department of Internal Medicine, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Julia I P van Heck
- Department of Internal Medicine, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Therese W Fabricius
- Department of Endocrinology and Nephrology, Nordsjaellands Hospital, Hillerød, Denmark
| | - Rinke Stienstra
- Department of Internal Medicine, Radboud University Medical Centre, Nijmegen, The Netherlands
- Division of Human Nutrition and Health, Wageningen University, Wageningen, The Netherlands
| | - Steven Teerenstra
- Section Biostatistics, Department for Health Evidence, Radboud Institute for Health Sciences, Radboud University Medical Centre, Nijmegen, The Netherlands
| | | | - Cees J Tack
- Department of Internal Medicine, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Ulrik Pedersen-Bjergaard
- Department of Endocrinology and Nephrology, Nordsjaellands Hospital, Hillerød, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Bastiaan E de Galan
- Department of Internal Medicine, Radboud University Medical Centre, Nijmegen, The Netherlands
- Department of Internal Medicine, Maastricht University Medical Centre, MUMC+, Maastricht, The Netherlands
- CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands
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3
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Iqbal A, Storey RF, Ajjan RA. Prolonged Inflammatory Response Post-Hypoglycemia: Mechanistic Insights Into the Relationship Between Low Glucose and Cardiovascular Risk. Diabetes 2022; 71:2483-2485. [PMID: 36409790 PMCID: PMC9862283 DOI: 10.2337/dbi22-0028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Accepted: 09/01/2022] [Indexed: 11/22/2022]
Affiliation(s)
- Ahmed Iqbal
- Department of Oncology and Metabolism, University of Sheffield, Sheffield, U.K
- Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, U.K
| | - Robert F. Storey
- Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, U.K
- Department of Infection, Immunity, and Cardiovascular Disease, University of Sheffield, Sheffield, U.K
| | - Ramzi A. Ajjan
- Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds, U.K
- Corresponding author: Ramzi Ajjan,
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Verhulst CE, van Heck JI, Fabricius TW, Stienstra R, Teerenstra S, McCrimmon RJ, Tack CJ, Pedersen-Bjergaard U, de Galan BE. Sustained Proinflammatory Effects of Hypoglycemia in People With Type 2 Diabetes and in People Without Diabetes. Diabetes 2022; 71:2716-2727. [PMID: 35848804 PMCID: PMC9750956 DOI: 10.2337/db22-0246] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 07/06/2022] [Indexed: 01/11/2023]
Abstract
Iatrogenic hypoglycemia activates the immune system and is associated with an increased risk for atherosclerotic disease. We determined acute and long-term effects of insulin-induced hypoglycemia on inflammatory markers in humans with or without type 2 diabetes. A total of 15 adults with type 2 diabetes and 16 matched control subjects (17 men and 14 women, age 59.6 ± 7.1 years, BMI 28.5 ± 4.3 kg/m2) underwent a hyperinsulinemic-euglycemic (5.31 ± 0.32 mmol/L) hypoglycemic (2.80 ± 0.12 mmol/L) glucose clamp. Blood was drawn during euglycemia and hypoglycemia and 1, 3, and 7 days later to determine circulating immune cell composition, function, and inflammatory proteins. In response to hypoglycemia, absolute numbers of circulating lymphocytes and monocytes significantly increased and remained elevated for 1 week. The proportion of CD16+ monocytes increased, and the proportion of CD14+ monocytes decreased, which was sustained for 1 week in people without diabetes. During hypoglycemia, ex vivo stimulated monocytes released more tumor necrosis factor-α and interleukin 1β, and less interleukin 10, particularly in people with diabetes. hs-CRP and 25 circulating inflammatory proteins increased, remaining significantly elevated 1 week after hypoglycemia. While levels at euglycemia differed, responses to hypoglycemia were broadly similar in people with or without type 2 diabetes. We conclude that hypoglycemia induces a proinflammatory response at the cellular and protein level that is sustained for 1 week in people with type 2 diabetes and control subjects.
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Affiliation(s)
| | - Julia I.P. van Heck
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Therese W. Fabricius
- Department of Endocrinology and Nephrology, Nordsjællands Hospital, Hillerød, Denmark
| | - Rinke Stienstra
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
- Division of Human Nutrition and Health, Wageningen University, Wageningen, the Netherlands
| | - Steven Teerenstra
- Section Biostatistics, Department for Health Evidence, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, the Netherlands
| | | | - Cees J. Tack
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Ulrik Pedersen-Bjergaard
- Department of Endocrinology and Nephrology, Nordsjællands Hospital, Hillerød, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Bastiaan E. de Galan
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
- Department of Internal Medicine, Maastricht University Medical Centre +, Maastricht, the Netherlands
- CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, the Netherlands
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Klimontov VV, Saik OV, Korbut AI. Glucose Variability: How Does It Work? Int J Mol Sci 2021; 22:ijms22157783. [PMID: 34360550 PMCID: PMC8346105 DOI: 10.3390/ijms22157783] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 07/16/2021] [Accepted: 07/17/2021] [Indexed: 02/07/2023] Open
Abstract
A growing body of evidence points to the role of glucose variability (GV) in the development of the microvascular and macrovascular complications of diabetes. In this review, we summarize data on GV-induced biochemical, cellular and molecular events involved in the pathogenesis of diabetic complications. Current data indicate that the deteriorating effect of GV on target organs can be realized through oxidative stress, glycation, chronic low-grade inflammation, endothelial dysfunction, platelet activation, impaired angiogenesis and renal fibrosis. The effects of GV on oxidative stress, inflammation, endothelial dysfunction and hypercoagulability could be aggravated by hypoglycemia, associated with high GV. Oscillating hyperglycemia contributes to beta cell dysfunction, which leads to a further increase in GV and completes the vicious circle. In cells, the GV-induced cytotoxic effect includes mitochondrial dysfunction, endoplasmic reticulum stress and disturbances in autophagic flux, which are accompanied by reduced viability, activation of apoptosis and abnormalities in cell proliferation. These effects are realized through the up- and down-regulation of a large number of genes and the activity of signaling pathways such as PI3K/Akt, NF-κB, MAPK (ERK), JNK and TGF-β/Smad. Epigenetic modifications mediate the postponed effects of glucose fluctuations. The multiple deteriorative effects of GV provide further support for considering it as a therapeutic target in diabetes.
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Affiliation(s)
- Vadim V. Klimontov
- Laboratory of Endocrinology, Research Institute of Clinical and Experimental Lymphology—Branch of the Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences (RICEL—Branch of IC&G SB RAS), 630060 Novosibirsk, Russia; (O.V.S.); (A.I.K.)
- Correspondence:
| | - Olga V. Saik
- Laboratory of Endocrinology, Research Institute of Clinical and Experimental Lymphology—Branch of the Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences (RICEL—Branch of IC&G SB RAS), 630060 Novosibirsk, Russia; (O.V.S.); (A.I.K.)
- Laboratory of Computer Proteomics, Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences (IC&G SB RAS), 630090 Novosibirsk, Russia
| | - Anton I. Korbut
- Laboratory of Endocrinology, Research Institute of Clinical and Experimental Lymphology—Branch of the Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences (RICEL—Branch of IC&G SB RAS), 630060 Novosibirsk, Russia; (O.V.S.); (A.I.K.)
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Ali N, Janssen AWM, Jaeger M, Van de Wijer L, van der Heijden W, ter Horst R, Vart P, van Gool A, Joosten LAB, Netea MG, Stienstra R, De Galan BE, Tack CJ. Limited impact of impaired awareness of hypoglycaemia and severe hypoglycaemia on the inflammatory profile of people with type 1 diabetes. Diabetes Obes Metab 2020; 22:2427-2436. [PMID: 33462962 PMCID: PMC7756490 DOI: 10.1111/dom.14172] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 07/31/2020] [Accepted: 08/12/2020] [Indexed: 12/11/2022]
Abstract
AIM To investigate whether a history of severe hypoglycaemia (SH) or the associated presence of impaired awareness of hypoglycaemia (IAH) is characterized by a pro-inflammatory profile in people with type 1 diabetes. RESEARCH DESIGN AND METHODS We measured circulating inflammatory markers and pro- and anti-inflammatory cytokine production after ex vivo stimulation of peripheral blood mononuclear cells (PBMCs) in a well-characterized cohort of individuals with type 1 diabetes (n = 239) and in people without diabetes (n = 56). Data were corrected for confounders by using multivariate linear regression models. RESULTS People with type 1 diabetes had higher circulating concentrations of high-sensitivity C-reactive protein (hs-CRP; 0.91 [0.36-2.25] vs. 0.52 [0.20-0.98] pg/mL, P < 0.001 and interleukin-18-binding protein (IL-18BP; 1746 [1304-2112] vs. 1381 [1191-1807] pg/mL; P = 0.001) than those without diabetes. In multivariate analysis, only higher hs-CRP concentrations persisted. Neither circulating immune cells nor ex vivo cytokine levels produced by PBMCs in response to an extensive panel of stimuli differed in groups defined by awareness state or a history of SH, apart from elevated IL-18BP in people with, versus those without, history of SH (1524 [1227-1903] vs. 1913 [1459-2408] pg/mL; P < 0.001). CONCLUSIONS IAH or history of SH in people with type 1 diabetes was not associated with altered inflammatory profiles, arguing against chronically elevated inflammatory activity mediating the increased cardiovascular risk associated with hypoglycaemia. The finding of higher circulating concentrations of IL-18BP in individuals with a history of SH requires further investigation.
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Affiliation(s)
- Namam Ali
- Department of Internal MedicineRadboud University Medical CentreNijmegenThe Netherlands
| | - Anna W. M. Janssen
- Department of Internal MedicineRadboud University Medical CentreNijmegenThe Netherlands
| | - Martin Jaeger
- Department of Internal MedicineRadboud University Medical CentreNijmegenThe Netherlands
| | - Lisa Van de Wijer
- Department of Internal MedicineRadboud University Medical CentreNijmegenThe Netherlands
| | | | - Rob ter Horst
- Department of Internal MedicineRadboud University Medical CentreNijmegenThe Netherlands
| | - Priya Vart
- Department of Health EvidenceRadboud University Medical CentreNijmegenThe Netherlands
- Department of CardiologyRadboud University Medical CentreNijmegenThe Netherlands
| | - Alain van Gool
- Translational Metabolic Laboratory, Department of Laboratory MedicineRadboud University Medical CentreNijmegenThe Netherlands
| | - Leo A. B. Joosten
- Department of Internal MedicineRadboud University Medical CentreNijmegenThe Netherlands
| | - Mihai G. Netea
- Department of Internal MedicineRadboud University Medical CentreNijmegenThe Netherlands
- Department for Genomics and Immunoregulation, Life and Medical Sciences Institute (LIMES)University of BonnBonnGermany
| | - Rinke Stienstra
- Department of Internal MedicineRadboud University Medical CentreNijmegenThe Netherlands
- Division of Human Nutrition and HealthWageningen University and ResearchWageningenThe Netherlands
| | - Bastiaan E. De Galan
- Department of Internal MedicineRadboud University Medical CentreNijmegenThe Netherlands
- Department of Internal MedicineMaastricht UMC+MaastrichtThe Netherlands
| | - Cees J. Tack
- Department of Internal MedicineRadboud University Medical CentreNijmegenThe Netherlands
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7
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Magnusson L, Barcenilla H, Pihl M, Bensing S, Espes D, Carlsson PO, Casas R. Mass Cytometry Studies of Patients With Autoimmune Endocrine Diseases Reveal Distinct Disease-Specific Alterations in Immune Cell Subsets. Front Immunol 2020; 11:288. [PMID: 32153591 PMCID: PMC7047233 DOI: 10.3389/fimmu.2020.00288] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 02/05/2020] [Indexed: 01/10/2023] Open
Abstract
Although there is evidence that autoimmune diseases share similar immunogenetic mechanisms, studies comparing peripheral CD45+ cells from patients with autoimmune endocrine diseases in parallel are limited. In this study, we applied high-dimensional single-cell mass cytometry to phenotypically characterize PBMC from patients with new-onset (N-T1D) and long-standing type 1 diabetes, Hashimoto's thyroiditis (HT), Graves' disease and autoimmune Addison's disease (AD), as well as healthy controls. The frequency of CD20loCD27hiCD38hiHLA-DRint plasmablasts, CD86+CD14loCD16+ non-classical monocytes and two subsets of CD56dimHLA-DR+IFN-γ+ NK cells were increased in patients with HT. Subsets of CD56dimCD69+HLA-DR- NK cells and CD8+ TEMRA cells, both expressing IFN-γ, were expanded and reduced, respectively, in the N-T1D group. In addition, patients with AD were characterized by an increased percentage of central memory CD8+ T cells that expressed CCR4, GATA3, and IL-2. We demonstrate that patients with N-T1D, HT, and AD had altered frequencies of distinct subsets within antigen-presenting and cytotoxic cell lineages. Previously unreported alterations of specific cell subsets were identified in samples from patients with HT and AD. Our study might contribute to a better understanding of shared and diverging immunological features between autoimmune endocrine diseases.
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Affiliation(s)
- Louise Magnusson
- Department of Medical Sciences, Uppsala University, Uppsala, Sweden.,Division of Children and Women Health, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Hugo Barcenilla
- Division of Children and Women Health, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Mikael Pihl
- Core Facility Flow Cytometry Unit, Faculty of Medicine, Linköping University, Linköping, Sweden
| | - Sophie Bensing
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
| | - Daniel Espes
- Department of Medical Sciences, Uppsala University, Uppsala, Sweden.,Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
| | - Per-Ola Carlsson
- Department of Medical Sciences, Uppsala University, Uppsala, Sweden.,Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
| | - Rosaura Casas
- Division of Children and Women Health, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
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8
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The early detection of atherosclerosis in type 1 diabetes: why, how and what to do about it. Cardiovasc Endocrinol Metab 2019; 8:14-27. [PMID: 31646294 DOI: 10.1097/xce.0000000000000169] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Accepted: 02/22/2019] [Indexed: 12/11/2022]
Abstract
The major cause of morbidity and often premature mortality in people with type I diabetes (T1D) is cardiovascular disease owing to accelerated atherosclerosis. We review publications relating to the rationale behind, and clinical tests for, detecting and treating early atherosclerosis in people with T1D. Currently available tools for atherosclerosis assessment include risk equations using vascular risk factors, arterial intima-media thickness, the ankle-brachial index, coronary artery calcification and angiography, and for more advanced lesions, intravascular ultrasound and optical coherence tomography. Evolving research tools include risk equations incorporating novel clinical, biochemical and molecular tests; vascular MRI and molecular imaging. As yet there is little information available to quantify early atherosclerosis. With better means to control the vascular risk factors, such as hypertension, dyslipidaemia and glycaemic control, and emerging therapies to control novel risk factors, further epidemiologic and clinical trials are merited to facilitate the translation into clinical practice of robust means to detect, monitor and treat early atherosclerosis in those with T1D.
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