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Raubenheimer PJ, Skelton J, Peya B, Dave JA, Levitt NS. Phenotype and predictors of insulin independence in adults presenting with diabetic ketoacidosis: a prospective cohort study. Diabetologia 2024; 67:494-505. [PMID: 38240751 PMCID: PMC10844464 DOI: 10.1007/s00125-023-06067-3] [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: 08/24/2023] [Accepted: 11/06/2023] [Indexed: 02/06/2024]
Abstract
AIMS/HYPOTHESIS The aim of this work was to describe the phenotype of adults presenting with a first episode of diabetic ketoacidosis (DKA) in Cape Town, South Africa, and identify predictors of insulin independence at 12 and 60 months after presentation. METHODS A prospective, descriptive cohort study of all individuals, 18 years or older, presenting for the first time with DKA to four public-sector hospitals of the Groote Schuur Academic Health Complex was performed. Clinical, biochemical and laboratory data including GAD antibody and C-peptide status were collected at baseline. Insulin was systematically weaned and stopped in individuals who achieved normoglycaemia within the months after DKA. Individuals were followed for 12 months and then annually until 5 years after initial presentation with ketoacidosis. RESULTS Eighty-eight individuals newly diagnosed with diabetes when presenting with DKA were included and followed for 5 years. The mean ± SD age was 35±10 years and the median (IQR) BMI at diagnosis was 28.5 (23.3-33.4) kg/m2. Overall, 46% were insulin independent 12 months after diagnosis and 26% remained insulin independent 5 years after presentation. Forty-one participants (47%) tested negative for anti-GAD and anti-IA-2 antibodies and had C-peptide levels >0.3 nmol/l; in this group, 68% were insulin independent at 12 months and 37% at 5 years after diagnosis. The presence of acanthosis nigricans was strongly associated with insulin independence (OR 27.1 [95% CI 7.2, 102.2]; p<0.001); a positive antibody status was associated with a lower likelihood of insulin independence at 12 months (OR 0.10 [95% CI 0.03, 0.36]; p<0.001). On multivariable analysis only acanthosis (OR 11.5 [95% CI 2.5, 53.2]; p=0.004) was predictive of insulin independence 5 years after diagnosis. CONCLUSIONS/INTERPRETATION The predominant phenotype of adults presenting with a first episode of DKA in Cape Town, South Africa, was that of ketosis-prone type 2 diabetes. These individuals presented with obesity, acanthosis nigricans, negative antibodies and normal C-peptide and could potentially be weaned off insulin at follow-up. Classic type 1 diabetes (lower weight, antibody positivity, low or unrecordable C-peptide levels and long-term insulin dependence) was less common. The simple clinical sign of acanthosis nigricans is a strong predictor of insulin independence at 12 months and 5 years after initial presentation.
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Affiliation(s)
- Peter J Raubenheimer
- Division of Endocrinology, Department of Medicine, University of Cape Town, Cape Town, South Africa.
| | - Joanna Skelton
- Division of Endocrinology, Department of Medicine, University of Cape Town, Cape Town, South Africa
| | - Bukiwe Peya
- Division of Endocrinology, Department of Medicine, University of Cape Town, Cape Town, South Africa
| | - Joel A Dave
- Division of Endocrinology, Department of Medicine, University of Cape Town, Cape Town, South Africa
| | - Naomi S Levitt
- Division of Endocrinology, Department of Medicine, University of Cape Town, Cape Town, South Africa
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Patel SG, Hsu JW, Jahoor F, Coraza I, Bain JR, Stevens RD, Iyer D, Nalini R, Ozer K, Hampe CS, Newgard CB, Balasubramanyam A. Pathogenesis of A⁻β⁺ ketosis-prone diabetes. Diabetes 2013; 62:912-22. [PMID: 23160531 PMCID: PMC3581228 DOI: 10.2337/db12-0624] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A⁻β⁺ ketosis-prone diabetes (KPD) is an emerging syndrome of obesity, unprovoked ketoacidosis, reversible β-cell dysfunction, and near-normoglycemic remission. We combined metabolomics with targeted kinetic measurements to investigate its pathophysiology. Fasting plasma fatty acids, acylcarnitines, and amino acids were quantified in 20 KPD patients compared with 19 nondiabetic control subjects. Unique signatures in KPD--higher glutamate but lower glutamine and citrulline concentrations, increased β-hydroxybutyryl-carnitine, decreased isovaleryl-carnitine (a leucine catabolite), and decreased tricarboxylic acid (TCA) cycle intermediates--generated hypotheses that were tested through stable isotope/mass spectrometry protocols in nine new-onset, stable KPD patients compared with seven nondiabetic control subjects. Free fatty acid flux and acetyl CoA flux and oxidation were similar, but KPD had slower acetyl CoA conversion to β-hydroxybutyrate; higher fasting β-hydroxybutyrate concentration; slower β-hydroxybutyrate oxidation; faster leucine oxidative decarboxylation; accelerated glutamine conversion to glutamate without increase in glutamate carbon oxidation; and slower citrulline flux, with diminished glutamine amide-nitrogen transfer to citrulline. The confluence of metabolomic and kinetic data indicate a distinctive pathogenic sequence: impaired ketone oxidation and fatty acid utilization for energy, leading to accelerated leucine catabolism and transamination of α-ketoglutarate to glutamate, with impaired TCA anaplerosis of glutamate carbon. They highlight a novel process of defective energy production and ketosis in A⁻β⁺ KPD.
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Affiliation(s)
- Sanjeet G. Patel
- Translational Metabolism Unit, Diabetes/Endocrinology Research Center, Baylor College of Medicine, Houston, Texas
| | - Jean W. Hsu
- Department of Pediatrics, Children’s Nutrition Research Center, Baylor College of Medicine, Houston, Texas
| | - Farook Jahoor
- Department of Pediatrics, Children’s Nutrition Research Center, Baylor College of Medicine, Houston, Texas
| | - Ivonne Coraza
- Translational Metabolism Unit, Diabetes/Endocrinology Research Center, Baylor College of Medicine, Houston, Texas
| | - James R. Bain
- Sarah W. Stedman Nutrition and Metabolism Center, Duke University Medical Center, Durham, North Carolina
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, North Carolina
| | - Robert D. Stevens
- Sarah W. Stedman Nutrition and Metabolism Center, Duke University Medical Center, Durham, North Carolina
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, North Carolina
| | - Dinakar Iyer
- Translational Metabolism Unit, Diabetes/Endocrinology Research Center, Baylor College of Medicine, Houston, Texas
| | - Ramaswami Nalini
- Translational Metabolism Unit, Diabetes/Endocrinology Research Center, Baylor College of Medicine, Houston, Texas
- Endocrine Service, Ben Taub General Hospital, Houston, Texas
| | - Kerem Ozer
- Translational Metabolism Unit, Diabetes/Endocrinology Research Center, Baylor College of Medicine, Houston, Texas
- Endocrine Service, Ben Taub General Hospital, Houston, Texas
| | | | - Christopher B. Newgard
- Sarah W. Stedman Nutrition and Metabolism Center, Duke University Medical Center, Durham, North Carolina
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, North Carolina
| | - Ashok Balasubramanyam
- Translational Metabolism Unit, Diabetes/Endocrinology Research Center, Baylor College of Medicine, Houston, Texas
- Endocrine Service, Ben Taub General Hospital, Houston, Texas
- Corresponding author: Ashok Balasubramanyam,
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Merger SR, Leslie RD, Boehm BO. The broad clinical phenotype of Type 1 diabetes at presentation. Diabet Med 2013; 30:170-8. [PMID: 23075321 DOI: 10.1111/dme.12048] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Revised: 09/18/2012] [Accepted: 10/15/2012] [Indexed: 12/27/2022]
Abstract
Immune-mediated (auto-immune) Type 1 diabetes mellitus is not a homogenous entity, but nonetheless has distinctive characteristics. In children, it may present with classical insulin deficiency and ketoacidosis at disease onset, whereas autoimmune diabetes in adults may not always be insulin dependent. Indeed, as the adult-onset form of autoimmune diabetes may resemble Type 2 diabetes, it is imperative to test for diabetes-associated autoantibodies to establish the correct diagnosis. The therapeutic response can be predicted by measuring the levels of autoantibodies to various islet cell autoantigens, such as islet cell antibodies (ICA), glutamate decarboxylase 65 (GAD65), insulin, tyrosine phosphatase (IA-2) and IA-2β, and zinc transporter 8 (ZnT8) and evaluating β-cell function. A high risk of progression to insulin dependency is associated with particular genetic constellations, such as human leukocyte antigen risk alleles, young age at onset, the presence of multiple autoantibodies, including high titres of anti-GAD antibodies; such patients should be offered early insulin replacement therapy, as they respond poorly to diet and oral hypoglycaemic drug therapy. Hence, considering the broad spectrum of phenotypes seen in adult-onset diabetes, treatment targets can only be reached by identification of immune-mediated cases, as their management differs from those with classical Type 2 diabetes.
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Affiliation(s)
- S R Merger
- Division of Endocrinology, Diabetes and Metabolism, Ulm University Medical Center, Ulm, Germany
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Liu B, Yu C, Li Q, Li L. Ketosis-onset diabetes and ketosis-prone diabetes: same or not? Int J Endocrinol 2013; 2013:821403. [PMID: 23710177 PMCID: PMC3655588 DOI: 10.1155/2013/821403] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Revised: 04/03/2013] [Accepted: 04/03/2013] [Indexed: 11/17/2022] Open
Abstract
Objective. To compare clinical characteristics, immunological markers, and β -cell functions of 4 subgroups ("A β " classification system) of ketosis-onset diabetes and ketosis prone diabetes patients without known diabetes, presenting with ketosis or diabetic ketoacidosis (DKA) and admitted to our department from March 2011 to December 2011 in China, with 50 healthy persons as control group. Results. β -cell functional reserve was preserved in 63.52% of patients. In almost each subgroup (except A- β - subgroup of ketosis prone group), male patients were more than female ones. The age of the majority of patients in ketosis prone group was older than that of ketosis-onset group, except A- β - subgroup of ketosis prone group. The durations from the patient first time ketosis or DKA onset to admitting to the hospital have significant difference, which were much longer for the ketosis prone group except the A+ β + subgroup. BMI has no significant difference among subgroups. FPG of ketosis prone group was lower than that of A- β + subgroup and A+ β + subgroup in ketosis-onset group. A- β - subgroup and A+ β + subgroup of ketosis prone group have lower HbA1c than ketosis-onset group. Conclusions. Ketosis-onset diabetes and ketosis prone diabetes do not absolutely have the same clinical characteristics. Each subgroup shows different specialty.
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Affiliation(s)
- Beiyan Liu
- Endocrinology and Metabolism Department of the Second Hospital Affiliated to Harbin Medical University, Harbin Medical University, Harbin, Heilongjiang Province 150086, China
| | - Changhua Yu
- Endocrinology and Metabolism Department of the Second Hospital Affiliated to Harbin Medical University, Harbin Medical University, Harbin, Heilongjiang Province 150086, China
| | - Qiang Li
- Endocrinology and Metabolism Department of the Second Hospital Affiliated to Harbin Medical University, Harbin Medical University, Harbin, Heilongjiang Province 150086, China
- *Qiang Li:
| | - Lin Li
- Endocrinology and Metabolism Department of the Second Hospital Affiliated to Harbin Medical University, Harbin Medical University, Harbin, Heilongjiang Province 150086, China
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Abstract
Ketosis-prone diabetes (KPD) is a widespread, emerging, heterogeneous syndrome characterized by patients who present with diabetic ketoacidosis or unprovoked ketosis but do not necessarily have the typical phenotype of autoimmune type 1 diabetes. Multiple, severe forms of beta-cell dysfunction appear to underlie the pathophysiology of KPD. Until recently, the syndrome has lacked an accurate, clinically relevant and etiologically useful classification scheme. We have utilized a large, longitudinally followed, heterogeneous, multiethnic cohort of KPD patients to identify four clinically and pathophysiologically distinct subgroups that are separable by the presence or absence of beta-cell autoimmunity and the presence or absence of beta-cell functional reserve. The resulting "Abeta" classification system of KPD has proven to be highly accurate and predictive of such clinically important outcomes as glycemic control and insulin dependence, as well as an aid to biochemical and molecular investigations into novel causes of beta-cell dysfunction. In this review, we describe the current state of knowledge in regard to the natural history, pathophysiology, and treatment of the subgroups of KPD, with an emphasis on recent advances in understanding their immunological and genetic bases.
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Affiliation(s)
- Ashok Balasubramanyam
- Translational Metabolism Unit, Division of Diabetes, Endocrinology and Metabolism, Baylor College of Medicine, Room 700B, One Baylor Plaza, and Endocrine Service, Ben Taub General Hospital, Houston, Texas 77030, USA.
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Re: A comparison of classification schemes for ketosis-prone diabetes. NATURE CLINICAL PRACTICE. ENDOCRINOLOGY & METABOLISM 2007; 3:E1. [PMID: 18026157 DOI: 10.1038/ncpendmet0698] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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