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Ma S, He R, Jiang T, Hu Z, Ye Z, Mi W. Development of an isotope dilution mass spectrometry assay for the quantification of insulin based on signature peptide analysis. Anal Bioanal Chem 2024; 416:3085-3096. [PMID: 38556594 DOI: 10.1007/s00216-024-05258-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 03/14/2024] [Accepted: 03/15/2024] [Indexed: 04/02/2024]
Abstract
An isotope dilution mass spectrometry (IDMS) method that involves peptide-based protein analysis was developed to accurately quantify insulin. In this study, a signature peptide (GFFYTPK) obtained from tryptic digestion of insulin was selected as a surrogate for insulin. Then, the optimal conditions for signature peptide analysis through mass spectrometry detection and enzymatic digestion were determined. The analytical performance of this method was assessed and validated using porcine insulin-certified reference material. The linear range of the insulin calibration curve ranged from 0.05 ~ 2 mass ratios, with recoveries ranging from 96.15 to approximately 101.15%. The limit of detection was 0.19 ng/mL, and the limit of quantification was 0.63 ng/mL. The quantitative results corresponded well with a certified value that was obtained from measuring a porcine insulin reference material with amino acid-based IDMS. In addition, the target peptide GFFYTPK can be found in other species of insulin. This method was also applied for the quantification of human insulin-certified reference material. Finally, we applied the method to quantify the concentrations of simulated serum insulin. These findings suggested that this signature peptide-based IDMS approach can accurately quantify insulin levels, can assign a certified value to insulin reference materials, and has the potential to quantify serum insulin with traceable measurements.
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Affiliation(s)
- Shangying Ma
- College of Life Sciences, China Jiliang University, Xueyuan Street 258, Hangzhou, 310018, China
| | - Rimei He
- Guangxi Zhuang Autonomous Region Institute of Metrology and Test, Nanning, 530200, China
| | - Tingting Jiang
- College of Life Sciences, China Jiliang University, Xueyuan Street 258, Hangzhou, 310018, China
| | - Zhishang Hu
- National Institute of Metrology, No.18 Beisanhuan Donglu, Beijing, 100029, China.
| | - Zihong Ye
- College of Life Sciences, China Jiliang University, Xueyuan Street 258, Hangzhou, 310018, China.
| | - Wei Mi
- National Institute of Metrology, No.18 Beisanhuan Donglu, Beijing, 100029, China.
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2
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Carslake HB, Pinchbeck GL, Argo CM, Dugdale AHA, McGowan CM. Investigation of glucagon-like peptide-1 response to six oral carbohydrates in ponies. Vet J 2024; 305:106110. [PMID: 38604332 DOI: 10.1016/j.tvjl.2024.106110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 04/03/2024] [Accepted: 04/08/2024] [Indexed: 04/13/2024]
Abstract
Glucagon-like peptide-1 (GLP-1), the principal incretin in horses, may play a role in the pathophysiology of insulin dysregulation (ID). This study aimed to describe its concentration in response to three preserved forages and four dynamic tests for ID in ponies. Twelve adult ponies of mixed ID status were given a meal of hay, soaked hay or haylage, an in-feed oral glucose test (OGT), oral sugar test (OST), an oral test using a proprietary breakfast cereal (WEET) or a combined glucose-insulin tolerance test (CGIT) weekly in a randomised cross-over study. Glucose, insulin and GLP-1 concentrations were measured before and following each intervention. Ponies were designated ID or non-ID and insulin resistant (IR) or non-IR according to OGT and CGIT results, respectively. All interventions apart from the CGIT provoked a GLP-1 response within 30 min. The OGT and WEET interventions, (containing the greatest dose of non-structural carbohydrate, 1.06 and 1 g/kg BW, respectively), resulted in a greater area under the curve (AUC) for GLP-1 compared to all other interventions (P < 0.001). No difference in GLP-1 response was detected according to ID or IR status, despite there being strong positive correlations (rs [95 % CI]) between GLP-1 and insulin concentrations measured at individual time points (0.67 [0.62 - 0.71]; P < 0.001) and as AUC (0.66 [0.49-0.79], P < 0.001). These data do not support of the use of GLP-1 as an adjunctive diagnostic test for ID or IR, as defined by conventional intravenous or oral dynamic tests.
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Affiliation(s)
- H B Carslake
- Institute of Infection, Veterinary and Ecological sciences, Faculty of Health and Life Sciences, University of Liverpool, Leahurst CH64 7TE, UK.
| | - G L Pinchbeck
- Institute of Infection, Veterinary and Ecological sciences, Faculty of Health and Life Sciences, University of Liverpool, Leahurst CH64 7TE, UK
| | - C M Argo
- Scotland's Rural College, Aberdeen, Scotland AB21 9YA, UK
| | | | - C M McGowan
- Institute of Infection, Veterinary and Ecological sciences, Faculty of Health and Life Sciences, University of Liverpool, Leahurst CH64 7TE, UK
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Kemp KL, Skinner JE, Bertin F. Effect of phenylbutazone on insulin secretion in horses with insulin dysregulation. J Vet Intern Med 2024; 38:1177-1184. [PMID: 38363029 PMCID: PMC10937495 DOI: 10.1111/jvim.17013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 01/26/2024] [Indexed: 02/17/2024] Open
Abstract
BACKGROUND Phenylbutazone is often prescribed to manage pain caused by hyperinsulinemia-associated laminitis, but in diabetic people nonsteroidal anti-inflammatory drugs increase insulin secretion and pancreatic activity. HYPOTHESIS/OBJECTIVES Investigate the effect of phenylbutazone administration on insulin secretion in horses. It was hypothesized that phenylbutazone will increase insulin secretion in horses with insulin dysregulation (ID). ANIMALS Sixteen light breed horses, including 7 with ID. METHODS Randomized cross-over study design. Horses underwent an oral glucose test (OGT) after 9 days of treatment with phenylbutazone (4.4 mg/kg IV q24h) or placebo (5 mL 0.9% saline). After a 10-day washout period, horses received the alternative treatment, and a second OGT was performed. Insulin and glucose responses were compared between groups (ID or controls) and treatments using paired t test and analyses of variance with P < .05 considered significant. RESULTS In horses with ID, phenylbutazone treatment significantly decreased glucose concentration (P = .02), glucose area under the curve (2429 ± 501.5 vs 2847 ± 486.1 mmol/L × min, P = .02), insulin concentration (P = .03) and insulin area under the curve (17 710 ± 6676 vs 22 930 ± 8788 μIU/mL × min, P = .03) in response to an OGT. No significant effect was detected in control horses. CONCLUSION AND CLINICAL IMPORTANCE Phenylbutazone administration in horses with ID decreases glucose and insulin concentrations in response to an OGT warranting further investigation of a therapeutic potential of phenylbutazone in the management of hyperinsulinemia-associated laminitis beyond analgesia.
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Affiliation(s)
- Kate L. Kemp
- School of Veterinary ScienceThe University of QueenslandGatton, QueenslandAustralia
| | - Jazmine E. Skinner
- School of Agriculture and Environmental ScienceUniversity of Southern QueenslandDarling Heights, QueenslandAustralia
| | - François‐René Bertin
- School of Veterinary ScienceThe University of QueenslandGatton, QueenslandAustralia
- College of Veterinary MedicinePurdue UniversityWest‐LafayetteIndianaUSA
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4
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Al-Ansari AS, Golding E, Walshe N, Mooney CT, Duggan V. Obesity and obesity-associated metabolic disease conditions in Connemara ponies in Ireland. Equine Vet J 2024; 56:273-280. [PMID: 37985219 DOI: 10.1111/evj.14029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 10/31/2023] [Indexed: 11/22/2023]
Abstract
BACKGROUND Equine obesity combined with insulin dysregulation (ID) is a major risk factor associated with laminitis. Some pony breeds appear to be at increased risk. However, little is known regarding the prevalence of obesity or hyperinsulinaemia as evidence of ID in Irish ponies. OBJECTIVE To investigate the prevalence of obesity and associated endocrine/metabolic disease conditions in Connemara ponies and to determine if hyperinsulinaemia in these ponies could be predicted by morphometric or metabolic markers. STUDY DESIGN Cross-sectional study. METHODS The study population included registered Connemara ponies recruited through public and veterinary social media posts. Ponies underwent a physical examination and information on their management and clinical history was obtained via owner questionnaire. The body condition score (BCS) was measured using the Henneke system; cresty neck score (CNS) and regionalised adiposity were also assessed. Hyperinsulinaemia was confirmed by measuring serum basal insulin concentration (BIC) or insulin concentration after an oral sugar test (OST). Blood glucose and triglyceride concentrations were measured. Characteristics of hyperinsulinaemic and insulin-sensitive ponies were compared by logistic regression. RESULTS Two hundred ponies were included; 59 ponies (29.5%) had a BCS ≥7, 58 (29.0%) had a CNS ≥2.5 and 135 (67.5%) had regionalised adiposity; 137 (68.5%) ponies had at least one of these abnormalities. Owner-reported history or clinical evidence of chronic laminitis was found in 92 ponies (46.0%). Hyperinsulinaemia was confirmed in 32 ponies (16.0%), including 23 of 91 (25.3%) detected by OST and 9 of 109 (8.3%) by BIC. Hypertriglyceridaemia was observed in 12 of 198 ponies (6.1%) ponies and hyperglycaemia in 11 of 197 ponies (5.6%) ponies. The odds of hyperinsulinaemia increased by a factor of 6.53 (95% confidence interval: 2.95, 15.21) when BCS was ≥7. MAIN LIMITATIONS The OST was not performed in all ponies. CONCLUSIONS Increased adiposity, laminitis and metabolic derangements are prevalent in this native Irish pony breed.
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Affiliation(s)
| | - Emma Golding
- School of Veterinary Medicine, University College Dublin, Dublin, Ireland
| | - Nicola Walshe
- School of Veterinary Medicine, University College Dublin, Dublin, Ireland
| | - Carmel T Mooney
- School of Veterinary Medicine, University College Dublin, Dublin, Ireland
| | - Vivienne Duggan
- School of Veterinary Medicine, University College Dublin, Dublin, Ireland
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5
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Carslake HB, Pinchbeck GL, Argo CM, Dugdale AHA, McGowan CM. Comparison of one novel and four established diagnostic tests for insulin dysregulation in ponies. Vet J 2024; 303:106059. [PMID: 38103885 DOI: 10.1016/j.tvjl.2023.106059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 12/11/2023] [Accepted: 12/12/2023] [Indexed: 12/19/2023]
Abstract
Several tests have been advocated for diagnosis of insulin dysregulation (ID). Tests using simple sugars may not reflect the response to naturally ingested carbohydrates. This study aimed to evaluate agreement between the oral glucose test (OGT), the oral sugar test (OST), a novel oral test using a proprietary cereal (WEET), the IV combined glucose-insulin tolerance test (CGIT) and fasted basal insulin (FI) for diagnosis of ID. Each of the five tests above was performed on a group of six normal and six insulin dysregulated mixed-breed ponies in a randomised crossover study. Area under the curve (AUC) and maximum concentration of insulin from OGT, OST and WEET showed strong to very strong bivariate correlations (r = 0.85-0.94, and r = 0.87-0.92, respectively; P ≤ 0.001) and were significantly different between tests (associated with dose of carbohydrate) and between CGIT-positive and -negative ponies. Dichotomous results showed substantial agreement between OST and both WEET (κ = 0.65; P = 0.02) and OGT (κ = 0.67; P = 0.01) and between CGIT and both OST (κ = 0.63; P = 0.03) and OGT (κ = 0.67; P = 0.01), and no agreement between FI, which had low sensitivity, and all other tests (κ = 0.15 - 0.31; P > 0. 05). Palatability of WEET was variable, resulting in one pony being excluded for analysis of WEET data. Further work on development of an oral test using a more palatable feedstuff and appropriate cut-offs or diagnostic thresholds for tests of ID is warranted.
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Affiliation(s)
- H B Carslake
- Institute of Infection, Veterinary and Ecological sciences, Faculty of Health and Life Sciences, University of Liverpool, Leahurst, UK CH64 7TE, UK.
| | - G L Pinchbeck
- Institute of Infection, Veterinary and Ecological sciences, Faculty of Health and Life Sciences, University of Liverpool, Leahurst, UK CH64 7TE, UK
| | - C M Argo
- Scotland's Rural College, Aberdeen, Scotland AB21 9YA, UK
| | - A H A Dugdale
- Paragon Veterinary referrals, Wakefield UK WF1 2DF, UK
| | - C M McGowan
- Institute of Infection, Veterinary and Ecological sciences, Faculty of Health and Life Sciences, University of Liverpool, Leahurst, UK CH64 7TE, UK
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6
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Delarocque J, Feige K, Carslake HB, Durham AE, Fey K, Warnken T. Development of a Web App to Convert Blood Insulin Concentrations among Various Immunoassays Used in Horses. Animals (Basel) 2023; 13:2704. [PMID: 37684968 PMCID: PMC10487020 DOI: 10.3390/ani13172704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 08/18/2023] [Accepted: 08/23/2023] [Indexed: 09/10/2023] Open
Abstract
The measurement of the blood insulin concentration, and comparison to cut-offs, is essential in diagnosing insulin dysregulation, a common equine endocrinopathy. However, different insulin assays provide disparate results. We aimed to ease comparison between assays by compiling original and published data into a web app to convert insulin measurements from one assay to another. Data were available for ADVIA Centaur insulin chemiluminescent immunoassay (CLIA), Beckman Coulter insulin radioimmunoassay (RIA), Immulite 1000 CLIA, Immulite 2000 CLIA, Immulite 2000 XPi CLIA, Mercodia equine insulin enzyme-linked immunosorbent assay (ELISA), and Millipore porcine insulin RIA. Linear models were fitted for 13 assay pairs using non-decreasing splines, and integrated into this app. Assay comparisons including data from several studies showed a lower performance. This indicates technical variation between laboratories, which has not been described before, but is relevant when diagnostic measurements and cut-offs are provided by different laboratories. Nevertheless, the models' overall high performance (median r2 = 0.94; range 0.57-1.00) supports their use to interpret results from diagnostic insulin measurements when the reference assay is unavailable, and to compare values obtained from different assays.
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Affiliation(s)
- Julien Delarocque
- Clinic for Horses, University of Veterinary Medicine Hannover, Foundation, Bünteweg 9, 30559 Hannover, Germany
| | - Karsten Feige
- Clinic for Horses, University of Veterinary Medicine Hannover, Foundation, Bünteweg 9, 30559 Hannover, Germany
| | - Harry B. Carslake
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst, Neston CH64 7TE, Cheshire, UK
| | - Andy E. Durham
- The Liphook Equine Hospital, Forest Mere, Liphook GU30 7JG, Hampshire, UK
| | - Kerstin Fey
- Equine Clinic, Internal Medicine, Faculty of Veterinary Medicine, Justus-Liebig-University of Giessen, Frankfurter Str. 126, 35392 Giessen, Germany
| | - Tobias Warnken
- Clinic for Horses, University of Veterinary Medicine Hannover, Foundation, Bünteweg 9, 30559 Hannover, Germany
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7
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Gupta A, Bhat HR, Singh UP. Discovery of imeglimin-inspired novel 1,3,5-triazine derivatives as antidiabetic agents in streptozotocin-induced diabetes in Wistar rats via inhibition of DPP-4. RSC Med Chem 2023; 14:1512-1536. [PMID: 37593577 PMCID: PMC10429709 DOI: 10.1039/d3md00085k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 05/21/2023] [Indexed: 08/19/2023] Open
Abstract
Novel 1,3,5-triazine derivatives bearing oxazine have been synthesized and tested for their ability to inhibit a panel of dipeptidyl peptidase (DPP)-4, 8, and 9 enzymes. In a comparative inhibitory assay, the molecules showed potent inhibition of DPP-4 ranging from IC50 of 4.2 ± 0.30-260.5 ± 0.42 nM, with no activity against DPP-8 and DPP-9. Among the tested series, compound 8c demonstrated the strongest DPP-4 inhibitory activity with an IC50 of 4.2 ± 0.30 nM. It also showed the greatest binding affinity during docking studies with DPP-4 with a docking score of -8.956 and a glide energy of -78.546 kcal mol-1 and was found oriented in the S1 and S2 pockets of the DPP-4 active site, which is composed of the catalytic triad Ser 630, Asp 710, and His 740. The in vivo pharmacological assay revealed that compound 8c in a dose-dependent manner improved the insulin level, body weight, antioxidants, and HDL, and reduced the levels of blood glucose, LDL, and VLDL in streptozotocin-induced diabetes in Wistar rats. Our study demonstrated the discovery and development of novel 1,3,5-triazine derivatives bearing oxazine as a novel class of anti-diabetic agents via inhibition of DPP-4.
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Affiliation(s)
- Akanksha Gupta
- Drug Design and Discovery Laboratory, Department of Pharmaceutical Sciences, Shalom Institute of Health and Allied Sciences, Sam Higginbottom University of Agriculture, Technology and Sciences Prayagraj Uttar Pradesh India 211007
- United Institute of Pharmacy Prayagraj Uttar Pradesh India 211008
| | - Hans Raj Bhat
- Department of Pharmaceutical Sciences, Dibrugarh University Dibrugarh Assam India 786004
| | - Udaya Pratap Singh
- Drug Design and Discovery Laboratory, Department of Pharmaceutical Sciences, Shalom Institute of Health and Allied Sciences, Sam Higginbottom University of Agriculture, Technology and Sciences Prayagraj Uttar Pradesh India 211007
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8
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Clark BL, Stewart AJ, Kemp KL, Bamford NJ, Bertin FR. Evaluation of field-testing protocols to diagnose insulin dysregulation in ponies using a Bayesian approach. Vet J 2023; 298-299:106019. [PMID: 37536451 DOI: 10.1016/j.tvjl.2023.106019] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 07/23/2023] [Accepted: 07/31/2023] [Indexed: 08/05/2023]
Abstract
Field tests and their association with laminitis have not been evaluated in large cohorts. The objectives of this study were to evaluate the performance of basal insulin (BI), the oral sugar test (OST) and the insulin tolerance test (ITT) to diagnose ID and investigate their association with laminitis. Insulin dysregulation status was determined in 146 ponies using BI (insulin concentration >20 µIU/mL), an OST (insulin concentration >65 µIU/mL at 60 or 90 min after oral administration of 0.45 mL/kg corn syrup) and an ITT (< 50% reduction in glucose concentration 30 min after intravenous administration of 0.1 IU/kg insulin). Laminitis was identified using modified-Obel scores. A Bayesian approach was used to define the characteristics of the tests and receiver operating characteristic curves were used to assess their association with laminitis. All tests were well tolerated and laminitis was diagnosed in 9% of ponies. Insulin dysregulation was diagnosed in 15% of ponies using BI, 38% using the OST and 54% using the ITT with 11% of ponies positive for all three tests. The sensitivities and specificities of BI, the OST and the ITT to diagnose ID were 0.52 (95% confidence interval [CI], 0.35-0.79) and 0.97 (95% CI, 0.91 - 1.00), 0.84 (95% CI, 0.70 - 0.94) and 0.60 (95% CI, 0.49 - 0.71), and 0.85 (95% CI, 0.68-0.96) and 0.88 (95% CI, 0.75 - 0.97), respectively. Only BI and the OST were associated with laminitis (P = 0.003 and 0.015, respectively).
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Affiliation(s)
- B L Clark
- The University of Queensland, 5391 Warrego Hwy, Gatton, QLD 4343, Australia.
| | - A J Stewart
- The University of Queensland, 5391 Warrego Hwy, Gatton, QLD 4343, Australia
| | - K L Kemp
- The University of Queensland, 5391 Warrego Hwy, Gatton, QLD 4343, Australia
| | - N J Bamford
- The University of Melbourne, Park Drive, Parkville, VIC 3010, Australia
| | - F-R Bertin
- The University of Queensland, 5391 Warrego Hwy, Gatton, QLD 4343, Australia
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9
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Clark BL, Bamford NJ, Stewart AJ, McCue ME, Rendahl A, Bailey SR, Bertin FR, Norton EM. Evaluation of an HMGA2 variant contribution to height and basal insulin concentrations in ponies. J Vet Intern Med 2023; 37:1186-1192. [PMID: 37148171 DOI: 10.1111/jvim.16723] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 04/08/2023] [Indexed: 05/08/2023] Open
Abstract
BACKGROUND The HMGA2:c.83G>A variant was identified in Welsh ponies having pleiotropic effects on height and insulin concentration. OBJECTIVE Determine whether the HMGA2:c.83G>A variant is associated with decreased height and higher basal insulin concentrations across pony breeds. ANIMALS Two hundred thirty-six ponies across 6 breeds. METHODS Cross-sectional study. Ponies were genotyped for the HMGA2:c.83G>A variant and phenotyped for height and basal insulin concentrations. Stepwise regression was performed for model analysis using a linear regression model for height and mixed linear model for insulin with farm as a random effect. Coefficient of determination, pairwise comparison of the estimated marginal means and partial correlation coefficients (parcor) were calculated to assess the relationship between HMGA2 genotype and height or insulin. RESULTS Breed and genotype accounted for 90.5% of the variation in height across breeds, and genotype explained 21% to 44% of the variation within breeds. Breed, genotype, cresty neck score, sex, age, and farm accounted for 45.5% of the variation in insulin, with genotype accounting for 7.1%. The HMGA2 A allele frequency was 62% and correlated with both height (parcor = -0.39; P < .001) and insulin (parcor = 0.22; P = .02). Pairwise comparisons found A/A ponies were >10 cm shorter than other genotypes. Compared with G/G individuals, A/A and G/A individuals had 4.3 μIU/mL (95% confidence interval [CI]: 1.8-10.5) and 2.7 μIU/mL (95% CI: 1.4-5.3) higher basal insulin concentrations, respectively. CONCLUSIONS AND CLINICAL IMPORTANCE These data demonstrate the pleiotropic effects of the HMGA2:c.83G>A variant and its role in identifying ponies at increased risk for insulin dysregulation.
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Affiliation(s)
- Brianna L Clark
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - Nicholas J Bamford
- Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria, Australia
| | - Allison J Stewart
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - Molly E McCue
- College of Veterinary Medicine, The University of Minnesota, St Paul, Minnesota, USA
| | - Aaron Rendahl
- College of Veterinary Medicine, The University of Minnesota, St Paul, Minnesota, USA
| | - Simon R Bailey
- Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria, Australia
| | - François-René Bertin
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - Elaine M Norton
- College of Agricultural and Life Sciences, The University of Arizona, Tucson, Arizona, USA
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10
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Go YY, Hazard NW, Balasuriya UBR, Chapman AM, Fitton NS, Kenéz Á, Andrews FM. Clinical evaluation of the Immulite® 1000 chemiluminescent immunoassay for measurement of equine serum insulin. Front Vet Sci 2023; 10:1018230. [PMID: 37051514 PMCID: PMC10083388 DOI: 10.3389/fvets.2023.1018230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 03/06/2023] [Indexed: 03/29/2023] Open
Abstract
IntroductionAccurate quantitative analysis of equine insulin in blood samples is critical for assessing hyperinsulinemia in horses. Although there are various laboratory methods for evaluating equine serum insulin, different immunoassays show significant discrepancies between the determined insulin concentrations and are often not comparable. The aim of this study was to evaluate the Immulite® 1000 chemiluminescent immunoassay (CLIA) to establish independent laboratory and assay-specific cut values to provide an accurate diagnosis of hyperinsulinemia in horses. Thus, the analytical and clinical performance of Immulite® 1000 CLIA in terms of precision (intra- and inter-assay coefficient of variance, CV) and recovery upon dilution were evaluated and compared with radioimmunoassay (RIA), which has been previously validated for use in horses.Material and methodsArchived serum samples (n = 106) from six Quarter horse mares enrolled in the glucose phase of a Frequently Sampled Insulin and Glucose Test (FSIGT) study were used to measure blood insulin.ResultsThe Immulite® 1000 CLIA had good precision with acceptable intra- and inter-assay CVs, adequate recovery on dilution, and a strong correlation with the RIA (r = 0.974, P < 0.0001), with constant bias resulting in consistently lower values.DiscussionOn this basis, the Immulite® 1000 Insulin Assay is valid for measuring equine serum insulin for diagnostic and monitoring purposes when cut values are appropriately adjusted.
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Affiliation(s)
- Yun Young Go
- Department of Infectious Diseases and Public Health, Jockey Club College of Veterinary Medicine and Life Sciences, City University of Hong Kong, Kowloon, Hong Kong SAR, China
| | - Nicole W. Hazard
- Louisiana Animal Disease Diagnostic Laboratory and Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, United States
| | - Udeni B. R. Balasuriya
- Louisiana Animal Disease Diagnostic Laboratory and Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, United States
| | - Anna M. Chapman
- Equine Health Studies Program, Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, United States
| | | | - Ákos Kenéz
- Department of Infectious Diseases and Public Health, Jockey Club College of Veterinary Medicine and Life Sciences, City University of Hong Kong, Kowloon, Hong Kong SAR, China
| | - Frank M. Andrews
- Equine Health Studies Program, Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, United States
- *Correspondence: Frank M. Andrews
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11
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Berryhill EH, Urbina NS, Marton S, Vernau W, Alonso FH. Validation and method comparison for a point-of-care lateral flow assay measuring equine whole blood insulin concentrations. J Vet Diagn Invest 2023; 35:124-131. [PMID: 36482705 PMCID: PMC9999392 DOI: 10.1177/10406387221142288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The Wellness Ready Test (WRT) is a lateral flow, stall-side assay that measures equine insulin in whole blood and requires validation before recommending clinical use. We evaluated intra- and inter-assay precision and linearity and compared the WRT with a radioimmunoassay (RIA). Tested concentrations ranged from <139 to >695 pmol/L (<20 to >100 μIU/mL). For 20 replicates at each insulin level, intra-assay CVs of the WRT for insulin were 13.3%, 12.9%, and 15.3% at low (139-278 pmol/L; 20-40 μIU/mL), intermediate (278-417 pmol/L; 40-60 μIU/mL), and high (>417 pmol/L; >60 μIU/mL) concentrations, respectively. For 10 replicates at each level (3 assay lots), inter-assay CVs were 15.9%, 11.0%, and 11.7%, respectively. In the weighted linear regression of 5 measured insulin concentrations against expected concentrations, R2 = 0.98, slope = 1.02, and y-intercept = 14.4 pmol/L (2.08 μIU/mL). The Spearman correlation coefficient (rs) was 0.90 (95% CI: 0.85-0.94) between the WRT and RIA; the WRT = f(RIA) Passing-Bablok regression yielded the fit, y = 1.005x + 24.3 pmol/L (3.50 μIU/mL). The WRT result averaged 10.4% higher than the RIA result, with targeted bias of 25.9, 26.1, and 26.7 pmol/L (3.74, 3.76, and 3.84 μIU/mL) for cutoffs used to diagnose insulin dysregulation of 312, 347, and 451 pmol/L (45, 50, and 65 μIU/mL). Assay clinical sensitivities, specificities, and accuracies determined at the 3 selected clinical cutoffs and using the RIA as gold standard were 87-95%, 92-96%, and 91-95%, respectively (n = 99 samples). Observed total error was 28.4-30.4%. The WRT had acceptable precision, excellent linearity, and good association with the RIA.
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Affiliation(s)
- Emily H Berryhill
- Departments of Medicine and Epidemiology, School of Veterinary Medicine, University of California-Davis, Davis, CA, USA
| | | | - Sam Marton
- Fortis Life Sciences, San Diego, CA, USA
| | - William Vernau
- Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California-Davis, Davis, CA, USA
| | - Flavio H Alonso
- Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California-Davis, Davis, CA, USA.,Department of Biomedical Sciences, School of Veterinary Medicine, Ross University, Saint Kitts, West Indies
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12
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Servarayan KL, Sundaram E, Manna A, Sivasamy VV. Label free optical biosensor for insulin using naturally existing chromene mimic synthesized receptors: A greener approach. Anal Chim Acta 2023; 1239:340692. [PMID: 36628760 DOI: 10.1016/j.aca.2022.340692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 11/28/2022] [Accepted: 11/29/2022] [Indexed: 12/05/2022]
Abstract
We currently reporting a simple and first label free optical insulin biosensor using a novel cum naturally existing Chromene mimic receptors via one pot greener methodology. Among synthesized 4H- Chromene derivatives, 2-amino-5,7-dihydroxy-4-(4-nitrophenyl)-4H-chromene-3-carbonitrile (Compound 1c) is showed a very good colorimetric response for insulin within the linear range of 20 fM -500 pM along with theoretically measured LOD of 15.38 fM based on the increment in absorbance. Meanwhile 2-amino-5, 7-dihydroxy-4-(pyren-2-yl)-4H-chromene-3-carbonitrile (Compound 1a) is depicted an excellent quenching in fluorescence response for insulin with LOD of 7.07 fM and along with wide working range from 10 fM -600 pM. The developed biosensor is tested for the detection of insulin in human blood serum using direct as well as standard addition method and the recovery results are showed a very good agreement with standard clinical chemiluminescent assay method. Hence, this developed biosensor is more reliable for clinical detection of Insulin and so a good analytical method for Diabetes diagnosis within a short period of time.
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Affiliation(s)
- Karthika Lakshmi Servarayan
- Department of Natural Products Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, 625 021, Tamilnadu, India
| | - Ellairaja Sundaram
- Department of Chemistry, Vivekananda College, Tiruvedakam West, Madurai, 625 234, Tamilnadu, India
| | - Abhijit Manna
- Washington University, St. Louis James Mackelvey School of Engineering, United States
| | - Vasantha Vairathevar Sivasamy
- Department of Natural Products Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, 625 021, Tamilnadu, India.
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13
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Sibthorpe PEM, Fitzgerald DM, Chen L, Sillence MN, de Laat MA. A starch-rich treat affects enteroinsular responses in ponies. J Am Vet Med Assoc 2022; 260:S94-S101. [PMID: 36191143 DOI: 10.2460/javma.22.06.0272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To determine the effect of a starch-rich treat, added to the daily diet of ponies for 10 days, on enteroinsular responses to meal consumption. ANIMALS 10 mixed-breed adult ponies owned by Queensland University of Technology were used in the study. Six ponies were metabolically healthy, and 4 were insulin dysregulated at the start of the study, according to the results of an in-feed oral glucose test. PROCEDURES A bread-based treat was offered twice daily for 10 days, adding 0.36 ± 0.04 g/kg body weight (BW) carbohydrates to the daily diet. Before and after treatment, the intestinal capacity for simple carbohydrate absorption was approximated with a modified D-xylose absorption test. Plasma glucagon-like peptide-2 (GLP-2), blood glucose, and serum insulin responses to eating were also measured before and after treatment. RESULTS The absorption of D-xylose (area under the curve [AUC]) increased 1.6-fold (P < .001) after 10 days of eating the treat. In addition, while basal (fasted) GLP-2 concentrations were not affected, GLP-2 AUC increased 1.4-fold in response to eating (P = .005). The treat did not change blood glucose or serum insulin concentrations, before, during, or after eating. CLINICAL RELEVANCE A small amount of additional carbohydrate each day in the form of a treat can cause a measurable change in the enteroinsular responses to eating.
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Affiliation(s)
- Poppy E M Sibthorpe
- School of Biology and Environmental Science, Queensland University of Technology, Brisbane, QLD, Australia
| | - Danielle M Fitzgerald
- School of Biology and Environmental Science, Queensland University of Technology, Brisbane, QLD, Australia
| | - Lan Chen
- Central Analytical Research Facility, Queensland University of Technology, Brisbane, QLD, Australia
| | - Martin N Sillence
- School of Biology and Environmental Science, Queensland University of Technology, Brisbane, QLD, Australia
| | - Melody A de Laat
- School of Biology and Environmental Science, Queensland University of Technology, Brisbane, QLD, Australia
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14
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Dosi MCMC, McGorum BC, Kirton RD, Cillán‐García E, Mellanby RJ, Keen JA, Hurst EA, Morgan RA. The effect of season, management and endocrinopathies on vitamin D status in horses. Equine Vet J 2022. [DOI: 10.1111/evj.13873] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 08/05/2022] [Indexed: 11/30/2022]
Affiliation(s)
- Miranda C. M. C. Dosi
- Royal (Dick) School of Veterinary Studies University of Edinburgh, Roslin Midlothian UK
| | - Bruce C. McGorum
- Royal (Dick) School of Veterinary Studies University of Edinburgh, Roslin Midlothian UK
| | | | - Eugenio Cillán‐García
- Royal (Dick) School of Veterinary Studies University of Edinburgh, Roslin Midlothian UK
| | - Richard J. Mellanby
- Royal (Dick) School of Veterinary Studies University of Edinburgh, Roslin Midlothian UK
- The Roslin Institute University of Edinburgh Roslin Midlothian UK
| | - John A. Keen
- Royal (Dick) School of Veterinary Studies University of Edinburgh, Roslin Midlothian UK
| | - Emma A. Hurst
- The Roslin Institute University of Edinburgh Roslin Midlothian UK
- Mass Spectrometry Core, Edinburgh Clinical Research Facility, Queen’s Medical Research Institute University of Edinburgh Edinburgh UK
| | - Ruth A. Morgan
- Royal (Dick) School of Veterinary Studies University of Edinburgh, Roslin Midlothian UK
- Queen’s Medical Research Institute The University of Edinburgh, Little France Crescent Edinburgh UK
- Scotland’s Rural College Edinburgh UK
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15
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Williams NJ, Furr M, Navas de Solis C, Campolo A, Davis M, Lacombe VA. Investigating the Relationship Between Cardiac Function and Insulin Sensitivity in Horses: A Pilot Study. Front Vet Sci 2022; 9:899951. [PMID: 35873691 PMCID: PMC9305457 DOI: 10.3389/fvets.2022.899951] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Accepted: 06/17/2022] [Indexed: 11/13/2022] Open
Abstract
Metabolic syndrome in humans is commonly associated with cardiovascular dysfunction, including atrial fibrillation and left ventricular diastolic dysfunction. Although many differences exist between human and equine metabolic syndrome, both of these conditions share some degree of insulin resistance. The aims of this pilot study were to investigate the relationship between insulin sensitivity and cardiac function. Seven horses (five mares, two geldings, aged 17.2 ± 4.2 years, weight 524 ± 73 kg) underwent insulin-modified frequently sampled intravenous glucose tolerance testing to determine insulin sensitivity (mean 2.21 ± 0.03 × 10−4 L/min/mU). Standard echocardiograms were performed on each horse, including two-dimensional, M-mode, and pulse-wave tissue Doppler imaging. Pearson and Spearman correlation analyses were used to determine the association of insulin sensitivity with echocardiographic measures of cardiac function in 5 horses. Insulin sensitivity was found to be significantly correlated with peak myocardial velocity during late diastole (r = 0.89, P = 0.0419), ratio between peak myocardial velocity in early and late diastole (r = −0.92, P = 0.0263), isovolumetric relaxation time (r = −0.97, P = 0.0072), and isovolumetric contraction time (ρ = −0.90, P = 0.0374). These preliminary data suggest that decreased insulin sensitivity is correlated with alterations in both systolic and diastolic function, as measured with tissue Doppler imaging (TDI). Due to the small sample size of this study, the relationship between insulin sensitivity and myocardial function in horses requires further investigation.
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Affiliation(s)
- Natasha J. Williams
- Department of Clinical Sciences, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK, United States
- *Correspondence: Natasha J. Williams
| | - Martin Furr
- Department of Physiological Sciences, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK, United States
| | - Cristobal Navas de Solis
- Department of Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, United States
| | - Allison Campolo
- Department of Physiological Sciences, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK, United States
| | - Michael Davis
- Department of Physiological Sciences, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK, United States
| | - Véronique A. Lacombe
- Department of Physiological Sciences, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK, United States
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16
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Kinsella HM, Hostnik LD, Snyder HA, Mazur SE, Kamr AM, Burns TA, Mossbarger JC, Toribio RE. Comparison of insulin sensitivity between healthy neonatal foals and horses using minimal model analysis. PLoS One 2022; 17:e0262584. [PMID: 35030228 PMCID: PMC8759699 DOI: 10.1371/journal.pone.0262584] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2021] [Accepted: 12/29/2021] [Indexed: 11/18/2022] Open
Abstract
The equine neonate is considered to have impaired glucose tolerance due to delayed maturation of the pancreatic endocrine system. Few studies have investigated insulin sensitivity in newborn foals using dynamic testing methods. The objective of this study was to assess insulin sensitivity by comparing the insulin-modified frequently sampled intravenous glucose tolerance test (I-FSIGTT) between neonatal foals and adult horses. This study was performed on healthy neonatal foals (n = 12), 24 to 60 hours of age, and horses (n = 8), 3 to 14 years of age using dextrose (300 mg/kg IV) and insulin (0.02 IU/kg IV). Insulin sensitivity (SI), acute insulin response to glucose (AIRg), glucose effectiveness (Sg), and disposition index (DI) were calculated using minimal model analysis. Proxy measurements were calculated using fasting insulin and glucose concentrations. Nonparametric statistical methods were used for analysis and reported as median and interquartile range (IQR). SI was significantly higher in foals (18.3 L·min-1· μIU-1 [13.4–28.4]) compared to horses (0.9 L·min-1· μIU-1 [0.5–1.1]); (p < 0.0001). DI was higher in foals (12 × 103 [8 × 103−14 × 103]) compared to horses (4 × 102 [2 × 102−7 × 102]); (p < 0.0001). AIRg and Sg were not different between foals and horses. The modified insulin to glucose ratio (MIRG) was lower in foals (1.72 μIUinsulin2/10·L·mgglucose [1.43–2.68]) compared to horses (3.91 μIU insulin2/10·L·mgglucose [2.57–7.89]); (p = 0.009). The homeostasis model assessment of beta cell function (HOMA-BC%) was higher in horses (78.4% [43–116]) compared to foals (23.2% [17.8–42.2]); (p = 0.0096). Our results suggest that healthy neonatal foals are insulin sensitive in the first days of life, which contradicts current literature regarding the equine neonate. Newborn foals may be more insulin sensitive immediately after birth as an evolutionary adaptation to conserve energy during the transition to extrauterine life.
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Affiliation(s)
- Hannah M. Kinsella
- College of Veterinary Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | - Laura D. Hostnik
- College of Veterinary Medicine, The Ohio State University, Columbus, Ohio, United States of America
- * E-mail:
| | - Hailey A. Snyder
- College of Veterinary Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | - Sarah E. Mazur
- College of Veterinary Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | - Ahmed M. Kamr
- College of Veterinary Medicine, The Ohio State University, Columbus, Ohio, United States of America
- Faculty of Veterinary Medicine, University of Sadat City, Sadat City, Egypt
| | - Teresa A. Burns
- College of Veterinary Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | | | - Ramiro E. Toribio
- College of Veterinary Medicine, The Ohio State University, Columbus, Ohio, United States of America
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17
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Lyn Macon E, Harris P, Partridge E, Day Barker V, Adams A. Effect of Dose and Fasting on Oral Sugar Test Responses in Insulin Dysregulated Horses. J Equine Vet Sci 2021; 107:103770. [PMID: 34802623 DOI: 10.1016/j.jevs.2021.103770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 09/02/2021] [Accepted: 09/13/2021] [Indexed: 11/15/2022]
Abstract
The oral sugar test (OST) is frequently used to identify insulin dysregulated (ID) equines. The effect of fasting and varying sugar dose for the OST has been investigated in the pony but little work has been done in the horse. This study aimed to investigate (1) an OST response with access to forage continued until the time of the OST or prevented for 3 hours prior to the OST and (2) responses of ID and non-insulin dysregulated (NID) horses to two different OST doses. Twenty-one mixed-breed horses (14.8 ± 3.2 years; 574.3 ± 83.3 kg) were used in two randomized crossover studies. Seven ID and seven NID horses were used in study A, and eight ID and eight NID in study B. Study A horses underwent an OST (0.15 mL/kg BW) either after a fast (FA) or directly off pasture (FE). Study B horses received either a low (LD; 0.15 mL/kg BW) or high dose (HD; 0.45 mL/kg BW) OST on one occasion each. Blood was collected at basal (T0), and post-60 minute (T60) for later determination of insulin (RIA). Data were analyzed via ANOVA with repeated measures. ID horses had significantly (P < 0.05) greater insulin responses than NID for all OSTs. There was no statistical difference between LD versus HD mean insulin concentrations (T0, T60, delta insulin) for either ID or NID horses. ID had higher T0 (P < 0.01) for FE compared to FA; however, FE and FA did not significantly affect T60 or delta insulins (DI) concentrations.
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Affiliation(s)
- Erica Lyn Macon
- 108 M. H. Gluck Equine Research Center, Department of Veterinary Science, University of Kentucky, Lexington, KY.
| | - Patricia Harris
- Equine Studies Group, WALTHAM Petcare Science Institute, Freeby Lane, Waltham-on-the-Wold, Leicestershire, UK
| | - Emma Partridge
- 108 M. H. Gluck Equine Research Center, Department of Veterinary Science, University of Kentucky, Lexington, KY
| | - Virginia Day Barker
- 108 M. H. Gluck Equine Research Center, Department of Veterinary Science, University of Kentucky, Lexington, KY
| | - Amanda Adams
- MARS Equestrian Research Fellow, Department of Veterinary Science, M. H. Gluck Equine Research Center, University of Kentucky, Lexington, KY
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18
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Ragno VM, Klein CD, Sereda NS, Uehlinger FD, Zello GA, Robinson KA, Montgomery JB. Morphometric, metabolic, and inflammatory markers across a cohort of client-owned horses and ponies on the insulin dysregulation spectrum. J Equine Vet Sci 2021; 105:103715. [PMID: 34607688 DOI: 10.1016/j.jevs.2021.103715] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 06/09/2021] [Accepted: 07/12/2021] [Indexed: 10/20/2022]
Abstract
In human metabolic syndrome and type II diabetes, methylglyoxal (MG), D-lactate, and several cytokines have been recognized as biomarkers of important metabolic and inflammatory processes. Equine metabolic syndrome (EMS) shares many similarities with these human counterparts. The objectives of this cross-sectional study were to compare body condition score (BCS), cresty neck score (CNS), resting insulin, MG, D-lactate, L-lactate, tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), and monocyte chemoattractant protein-1 (MCP-1) between horses with and without insulin dysregulation, as classified via combined glucose and insulin test (CGIT). 32 client-owned horses were included. History and morphometric data such as BCS and CNS were recorded. Subjects with abnormalities on physical examination or CBC, elevated ACTH or incomplete information were excluded. Baseline serum or plasma concentrations of biomarkers were tested via commercial ELISA or colorimetric assays. Characteristics of insulin dysregulated and insulin sensitive horses were compared by univariate analysis and forward logistic regression. 12 (38%) of the 32 horses were classified as insulin dysregulated. No significant difference between the 2 groups was found for age, BCS, baseline glucose, triglycerides, MG, D-lactate, L-lactate, TNF-α, IL-6, and MCP-1. Baseline insulin was significantly associated with insulin dysregulation in univariate analysis (P = 0.02), but not in the final model. Horses with CNS ≥ 3 had 11.3 times higher odds of having insulin dysregulation (OR 11.3, 95% C.I. 2.04 - 63.08, P = 0.006). In this population, horses with mild-moderate signs of EMS presented similar metabolic and inflammatory profiles to non-insulin dysregulated controls.
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Affiliation(s)
- Valentina M Ragno
- Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
| | - Colby D Klein
- Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Nicole S Sereda
- Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Fabienne D Uehlinger
- Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Gordon A Zello
- College of Pharmacy and Nutrition, University of Saskatchewan, Saskatoon, Saskatchewan Canada
| | - Katherine A Robinson
- Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Julia B Montgomery
- Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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19
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Stokes SM, Stefanovski D, Bertin FR, Medina-Torres CE, Belknap JK, van Eps AW. Plasma amino acid concentrations during experimental hyperinsulinemia in 2 laminitis models. J Vet Intern Med 2021; 35:1589-1596. [PMID: 33704816 PMCID: PMC8163125 DOI: 10.1111/jvim.16095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 02/14/2021] [Accepted: 02/19/2021] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Endocrinopathic laminitis develops in association with insulin dysregulation, but the role of insulin in the pathogenesis remains unclear. Hyperinsulinemia can cause hypoaminoacidemia, which is associated with integumentary lesions in other species and therefore warrants investigation as a potential mechanism in laminitis. OBJECTIVE Evaluate plasma amino acid concentrations in the euglycemic-hyperinsulinemic clamp (EHC) and prolonged glucose infusion (PGI) laminitis models. ANIMALS Sixteen Standardbred horses. METHODS Prospective experimental study. Plasma amino acid concentrations were measured in samples collected every 6 hours from horses that underwent a 48-hour EHC (n = 8) or 66-hour PGI (n = 8) after a 24- or 6-hour baseline period in EHC and PGI groups, respectively. RESULTS Fifteen of the 20 measured amino acid concentrations decreased over time in both EHC and PGI horses (P < 0.001). The median percentage change from baseline for these amino acids was: histidine (EHC: 41.5%; PGI: 43.9%), glutamine (EHC: 51.8%; PGI: 35.3%), arginine (EHC: 51.4%; PGI: 41%), glutamic acid (EHC: 52.4%; PGI: 31.7%), threonine (EHC: 62.8%; PGI: 25.2%), alanine (EHC: 48.9%; PGI: 19.5%), proline (EHC: 56.2%; PGI: 30.3%), cystine (EHC: 34.9%; PGI: 31.2%), lysine (EHC: 46.4%; PGI: 27.8%), tyrosine (EHC: 27.5%; PGI: 16.9%), methionine (EHC: 69.3%; PGI: 50.8%), valine (EHC: 50.8%; PGI: 34.4%), isoleucine (EHC: 60.8%; PGI: 38.7%), leucine (EHC: 48.2%; PGI: 36.6%), and phenylalanine (EHC: 16.6%; PGI: 12.1%). CONCLUSIONS AND CLINICAL IMPORTANCE Hypoaminoacidemia develops in EHC and PGI laminitis models. The role of hypoaminoacidemia in the development of hyperinsulinemia-associated laminitis warrants further investigation.
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Affiliation(s)
- Simon M Stokes
- Australian Equine Laminitis Research Unit, School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - Darko Stefanovski
- Department of Clinical Studies, School of Veterinary Medicine, New Bolton Center, University of Pennsylvania, Kennett Square, Pennsylvania, USA
| | - François-René Bertin
- Australian Equine Laminitis Research Unit, School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - Carlos E Medina-Torres
- Australian Equine Laminitis Research Unit, School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - James K Belknap
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, Ohio, USA
| | - Andrew W van Eps
- Australian Equine Laminitis Research Unit, School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia.,Department of Clinical Studies, School of Veterinary Medicine, New Bolton Center, University of Pennsylvania, Kennett Square, Pennsylvania, USA
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20
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Carslake HB, Pinchbeck GL, McGowan CM. Equine metabolic syndrome in UK native ponies and cobs is highly prevalent with modifiable risk factors. Equine Vet J 2020; 53:923-934. [PMID: 33128277 PMCID: PMC8451835 DOI: 10.1111/evj.13378] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 09/22/2020] [Accepted: 10/22/2020] [Indexed: 12/29/2022]
Abstract
BACKGROUND The epidemiology of equine metabolic syndrome (EMS) is poorly described. OBJECTIVES To estimate the prevalence of EMS in native UK ponies and cobs in England and Wales and identify associated risk factors. STUDY DESIGN Cross-sectional study. METHODS Breeders registered with UK native pony breed societies and registered riding schools and livery yards within a set radius were invited to participate. All native UK ponies and cobs aged 3-14 years and not diagnosed or being treated for conditions likely to affect insulin regulation at participating premises were eligible. Animals underwent a clinical examination and an oral glucose test while their owner or keeper completed a questionnaire by face-to-face interview. Data were analysed by multilevel uni- and multivariable modelling using insulin concentration and EMS diagnosis as outcomes. RESULTS A total of 354 animals were examined at 64 properties (19 studs, 19 livery yards, 26 riding schools). The overall prevalence of EMS adjusted for clustering within yard was 23.3% (95%CI 17.9%-29.8%). Risk factors associated with a diagnosis of EMS included age, being female, more sedentary main activity, obesity, and shorter periods on pasture during the summer. Compared to the Welsh section A, the other Welsh, Connemara and cob breeds all had decreased odds of EMS. Clinical manifestations of hoof growth ring and supraorbital fat scores of 3/3 were more frequent in EMS ponies and animals with a history of laminitis within the last 5 years (9.7%) were 14.4 (95% CI 5.9-35.3) times more likely to be positive for EMS than those without. MAIN LIMITATIONS Results may not be transferable to other breeds or age groups. CONCLUSIONS Equine metabolic syndrome is highly prevalent in UK native ponies and cobs with modifiable risk factors including obesity and sedentary activities. Modifying risk factors could help reduce the risk of laminitis in susceptible animals.
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Affiliation(s)
- Harry B Carslake
- Institute of Infection, Veterinary and Ecological Sciences, Faculty of Health and Life Sciences, University of Liverpool, Leahurst, UK
| | - Gina L Pinchbeck
- Institute of Infection, Veterinary and Ecological Sciences, Faculty of Health and Life Sciences, University of Liverpool, Leahurst, UK
| | - Catherine M McGowan
- Institute of Infection, Veterinary and Ecological Sciences, Faculty of Health and Life Sciences, University of Liverpool, Leahurst, UK
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21
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Raja MA, Mondal P, Venu K, Thimmaraju MK, Kiran P. Food-drug interaction and pharmacokinetic study between fruit extract of Capsicum frutescens L. and glimepiride in diabetic rats. CLINICAL PHYTOSCIENCE 2020. [DOI: 10.1186/s40816-020-00191-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
The present study was designed to explore the food-drug and pharmacokinetic interaction between C.frutescens, a culinary herb on hypoglycemic activity of glimepiride, a sulfonyl urea derivative used in the treatment of type-2 diabetes) in diabetic rats in combination of each as single doses for one day. Further it is also aimed to study the effect of AQEFCF on antidiabetic effect of glimepiride by repeated dose treatment of AQEFCF for 8 days followed by single dose of Glimepiride in diabetic rats and also with repeated dose treatment of both drugs for 8 days in diabetic rats.
Methods
Acute toxicity study was conducted as per OECD guidelines 425, as per this study maximum 2000 mg/kg dose was given to albino mice as observed for mortality of the aqueous extract of C.frutescens. Later in order to know the dose dependent action three doses were selected (1/5th,1/10th and 1/20th) for antidiabetic study. Before treatment with either AQEFCF or Glimepiride fasting ‘0’ blood samples were collected and serum glucose levels were analysed by GOD-POD method using semi-auto analyser. AQEFCF (100, 200 and 400 mg/kg p.o) glimepiride 1/2TD, TD and 2TD (0.036, 0.072 and 0.144 mg/200 g p.o) were administered orally alone as well as in combination i.e. AQEFCF as single dose followed by a single dose of glimepiride 30 min later in Phase I. In II Phase repeated doses of AQEFCF for 8 days followed by a single dose of glimepiride (30 min later) on 8th day. In Phase III both the drugs are administered as single doses for 8 days in the same group of diabetic rats. After the treatment serum glucose levels were determined in all the groups of rats at prefixed time intervals i.e.; 1, 2, 3, 4, 6, 8, 10, 12, 16 and 24 h.
Results
Both AQEFCF and glimepiride when administered as single doses produced a dose dependent antidiabetic activity in diabetic rats. The combination of AQEFCF and glimepiride at the different dose levels has shown an better antidiabetic effect. AQEFCF augmented the effect of glimepiride in streptozotocin induced diabetic rats.
Conclusion
It has been concluded that no significant food drug interaction occurred between AQEFCF of C. frutescence and glimepiride either single dose or combination of repeated doses. Empirical evidences clears that there is also no pharmacokinetic interaction also observed.
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22
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d' Fonseca NMM, Gibson CME, van Doorn DA, de Ruijter-Villani M, Stout TAE, Roelfsema E. Effect of long-term overfeeding of a high-energy diet on glucose tolerance in Shetland pony mares. J Vet Intern Med 2020; 34:1339-1349. [PMID: 32374454 PMCID: PMC7255650 DOI: 10.1111/jvim.15788] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 04/09/2020] [Indexed: 12/05/2022] Open
Abstract
Background Overfeeding is associated with obesity and insulin dysregulation (ID), which are both risk factors for equine metabolic syndrome. How chronic overfeeding affects development of these factors is poorly understood. Objectives To examine the influence of long‐term high‐energy diet provision on body condition and ID. Animals Eleven Shetland pony mares. Methods In a 3‐phase study, the high‐energy group (n = 7) was fed 200% of net energy (NE) requirements (hay; concentrate: 36% sugar and starch, 13% fat) for 24 weeks, followed by 17 weeks hay‐only feeding before resuming the high‐energy diet (n = 4) for an additional 29 weeks. Mares were weighed weekly. Oral glucose tolerance tests were performed 3 to 4 times per dietary period. Results were compared with those of a control group (phase 1, n = 4; phases 2 and 3, n = 6) that received 100% NE requirements, using a general linear mixed model with post hoc Bonferroni testing. Results The mean body weight of the high‐energy group increased by 27% per high‐energy feeding period. During both feeding periods, area under the curve (AUC) for plasma glucose concentration decreased (P < .01), whereas AUC for plasma insulin concentration increased. Mean basal plasma glucose concentration and peak plasma insulin concentrations were higher (P < .05) in the high‐energy group than in the control group. Conclusion and Clinical Importance Feeding a high‐energy diet to healthy nonobese Shetland pony mares led to more efficient glucose metabolism within 5 weeks, followed by significant hyperinsulinemia and obesity. Hyperinsulinemic status was reversed during 17 weeks of hay‐only feeding, regardless of body condition, but returned rapidly after restarting the high‐energy diet.
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Affiliation(s)
- Nicky M M d' Fonseca
- Department of Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| | - Charlotte M E Gibson
- Department of Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| | - David A van Doorn
- Department of Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands.,Division of Nutrition, Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| | - Marta de Ruijter-Villani
- Department of Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| | - Tom A E Stout
- Department of Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| | - Ellen Roelfsema
- Department of Equine Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
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Kritchevsky JE, Muir GS, Leschke DHZ, Hodgson JK, Hess EK, Bertin FR. Blood glucose and insulin concentrations after alpha-2-agonists administration in horses with and without insulin dysregulation. J Vet Intern Med 2020; 34:902-908. [PMID: 32100334 PMCID: PMC7096659 DOI: 10.1111/jvim.15747] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 02/14/2020] [Indexed: 01/08/2023] Open
Abstract
Background In metabolically stable horses, alpha‐2‐agonists suppress insulin secretion with transient hyperglycemia and rebound hyperinsulinemia. In horses with insulin dysregulation (ID), the effect of alpha‐2‐agonists has not been investigated; however, both the alpha‐2‐agonist‐induced suppression of insulin secretion and rebound hyperinsulinemia could have clinical relevance. Hypothesis/Objectives In horses with ID, alpha‐2‐agonists will alter insulin and glucose dynamics. Animals Seven horses with ID and 7 control horses. Methods In this randomized crossover study, xylazine hydrochloride (1.1 mg/kg) or detomidine hydrochloride (30 μg/kg) were administered IV, and blood was collected for glucose and insulin concentrations at 0, 15, 30, 45, 60, 90, 120, 150, 180, and 300 minutes after administration. Horses received each drug in a random order with a 24‐hour washout period between drugs. Percent change in glucose and insulin concentrations was compared between groups, drugs, and over time with P < .05 considered significant. Results A significant time‐dependent effect of both alpha‐2‐agonists on glucose and insulin concentrations in control and ID horses was identified (P = .01 for all comparisons). There was no significant effect of sedative selection and endocrine status on blood glucose concentration in either group; however, in ID horses, xylazine administration resulted in severe rebound hyperinsulinemia whereas detomidine administration did not (P = .02). Conclusions and Clinical Importance Alpha‐2‐agonists have a significant effect on glucose and insulin concentrations in horses. In ID horses, detomidine could minimize hyperinsulinemia when compared to xylazine.
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Affiliation(s)
- Janice E Kritchevsky
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Purdue University, West Lafayette, Indiana
| | - Genevieve S Muir
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - Dakota H Z Leschke
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - Jack K Hodgson
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - Emily K Hess
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Purdue University, West Lafayette, Indiana
| | - Francois-Rene Bertin
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
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Xu YY, Xu SM, Li XM, Li D, Yan J, Xu PS. Validation of the ADVIA Centaur® XP system for the determination of insulin and its application. Anal Biochem 2020; 591:113567. [DOI: 10.1016/j.ab.2019.113567] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 12/17/2019] [Accepted: 12/23/2019] [Indexed: 01/09/2023]
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25
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Leschke DH, Muir GS, Hodgson JK, Coyle M, Horn R, Bertin FR. Immunoreactive insulin stability in horses at risk of insulin dysregulation. J Vet Intern Med 2019; 33:2746-2751. [PMID: 31617618 PMCID: PMC6872612 DOI: 10.1111/jvim.15629] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 09/20/2019] [Indexed: 01/13/2023] Open
Abstract
Background Diseases associated with insulin dysregulation (ID), such as equine metabolic syndrome and pituitary pars intermedia dysfunction, are of interest to practitioners because of their association with laminitis. Accurate insulin concentration assessment is critical in diagnosing and managing these diseases. Hypothesis/Objectives To determine the effect of time, temperature, and collection tube type on insulin concentrations in horses at risk of ID. Animals Eight adult horses with body condition score >6/9. Methods In this prospective study, subjects underwent an infeed oral glucose test 2 hours before blood collection. Blood samples were divided into ethylenediaminetetraacetic acid, heparinized, or serum tubes and stored at 4 or 20°C. Tubes were centrifuged and analyzed for insulin by a chemiluminescent assay over 8 days. Changes in insulin concentrations were compared with a linear mixed effects model. Results An overall effect of time, tube type and temperature was identified (P = .01, P = 0.001, and P = 0.001, respectively). Serum and heparinized samples had similar concentrations for 3 days at 20°C and 8 days at 4°C; however, after 3 days at 20°C, heparinized samples had significantly higher insulin concentrations (P = .004, P = .03, and P = .03 on consecutive days). Ethylenediaminetetraacetic acid samples had significantly lower insulin concentrations regardless of time and temperature (P = .001 for all comparisons). Conclusions and Clinical Importance These results suggest an ideal protocol to determine insulin concentrations involves using serum or heparinized samples with analysis occurring within 3 days at 20°C or 8 days at 4°C.
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Affiliation(s)
- Dakota H Leschke
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - Genevieve S Muir
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - Jack K Hodgson
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - Mitchell Coyle
- School of Agriculture and Food Sciences, The University of Queensland, Gatton, Queensland, Australia
| | - Remona Horn
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - François-René Bertin
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
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26
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Olley RB, Carslake HB, Ireland JL, McGowan CM. Comparison of fasted basal insulin with the combined glucose-insulin test in horses and ponies with suspected insulin dysregulation. Vet J 2019; 252:105351. [PMID: 31554591 DOI: 10.1016/j.tvjl.2019.105351] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 07/31/2019] [Accepted: 07/31/2019] [Indexed: 01/23/2023]
Abstract
Fasting horses for measurement of basal serum insulin concentration (fasting insulin; FI) has been recommended to standardise testing for insulin dysregulation (ID), yet limited data exist comparing it to dynamic tests. This study aimed to compare FI with the combined glucose-insulin test (CGIT) in horses suspect for ID. We hypothesised that FI would have poor sensitivity for detecting ID compared to CGIT using conventional cut-offs. Records were retrieved from CGITs performed in horses fasted for approximately 8h. Serum insulin and glucose concentrations were measured before and for 150min following an IV bolus of glucose followed by insulin. Correlations between FI and CGIT values were assessed. Youden's index analysis was used to determine the optimal cut-off for FI. Logistic regression and Mann-Whitney U tests were used to determine factors affecting the results. CGITs (n=130) from 62 horses were evaluated. Compared to CGIT, sensitivity and specificity of FI for diagnosis of ID were 14.6% and 100% at a cut-off of 20μIU/mL and 63.4% and 87.2% at a cut-off of 5.2μIU/mL, respectively. FI was significantly correlated with insulin at 45min (rs=0.66) and 75min (rs=0.72); area under the curve for insulin (AUCinsulin; rs=0.67); glucose at 45min (rs=0.53); and AUCglucose (rs=0.50). Obesity was significantly associated with increased odds of a positive CGIT and horses with a positive CGIT were significantly older (P<0.05). In conclusion, FI correlated well with CGIT results and had adequate sensitivity and specificity at lower cut-offs, despite poor sensitivity at conventional cut-off values. Further research to derive cut-off values relevant to the fasting period is warranted.
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Affiliation(s)
- R B Olley
- Institute of Veterinary Science, Faculty of Health and Life Sciences, University of Liverpool, Leahurst, Cheshire CH64 7TE, UK
| | - H B Carslake
- Institute of Veterinary Science, Faculty of Health and Life Sciences, University of Liverpool, Leahurst, Cheshire CH64 7TE, UK
| | - J L Ireland
- Institute of Veterinary Science, Faculty of Health and Life Sciences, University of Liverpool, Leahurst, Cheshire CH64 7TE, UK
| | - C M McGowan
- Institute of Veterinary Science, Faculty of Health and Life Sciences, University of Liverpool, Leahurst, Cheshire CH64 7TE, UK.
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Fitzgerald DM, Anderson ST, Sillence MN, de Laat MA. The cresty neck score is an independent predictor of insulin dysregulation in ponies. PLoS One 2019; 14:e0220203. [PMID: 31339945 PMCID: PMC6655749 DOI: 10.1371/journal.pone.0220203] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 07/10/2019] [Indexed: 01/12/2023] Open
Abstract
Generalized obesity, regional adiposity, hyperinsulinemia and hypertriglyceridemia are all potential indicators of equine metabolic syndrome (EMS). This study aimed to assess the relationship between morphometric measurements of body condition and metabolic hormone concentrations in ponies, with and without a neck crest or generalised obesity. Twenty-six ponies were assigned a body condition score (BCS) and cresty neck score (CNS). Height, girth, and neck measurements were taken. An oral glucose test (OGT; 0.75g dextrose/kg BW) was performed and blood samples collected prior to and 2 hours post dosing. Basal blood samples were analysed for blood glucose, serum insulin, triglyceride and leptin, and plasma HMW adiponectin concentrations. Post-prandial samples were analysed for serum insulin concentration. The ponies were grouped as having a) a normal to fleshy body status (BCS ≤7 and CNS ≤2; n = 10); b) having a high CNS, but without generalised obesity (BCS ≤7 and CNS ≥3; n = 11), or c) being obese (BCS ≥8 and CNS ≥1; n = 5). Responses to the OGT indicated that both normal and insulin-dysregulated ponies were included in the cohort. Post-prandial serum insulin was positively associated with CNS (P<0.035) and ponies with a CNS ≥ 3 had 5 times greater odds of being insulin-dysregulated. The high CNS group had a greater insulin response to the OGT than those in the normal/fleshy group (P = 0.006), whereas obese ponies did not differ from the other two groups. Basal HMW adiponectin was negatively correlated with post-prandial insulin concentrations (r = -0.5, P = 0.009), as well as being decreased in the group with a high CNS, compared to the obese group (P = 0.05). Cresty neck score was more predictive of insulin dysregulation than BCS, and this may be relevant to the diagnosis of EMS. Adiponectin may also be a measure of insulin dysregulation that is independent of body condition.
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Affiliation(s)
- Danielle M. Fitzgerald
- Earth, Environmental and Biological Sciences School, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Stephen T. Anderson
- School of Biomedical Sciences, The University of Queensland, St Lucia, Queensland, Australia
| | - Martin N. Sillence
- Earth, Environmental and Biological Sciences School, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Melody A. de Laat
- Earth, Environmental and Biological Sciences School, Queensland University of Technology, Brisbane, Queensland, Australia
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28
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McFarlane D. Diagnostic Testing for Equine Endocrine Diseases: Confirmation Versus Confusion. Vet Clin North Am Equine Pract 2019; 35:327-338. [PMID: 31076223 DOI: 10.1016/j.cveq.2019.03.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Despite there being only 2 common endocrine diseases in horses, pituitary pars intermedia dysfunction (PPID) and equine metabolic syndrome (EMS), diagnosis is still confusing. Failing to consider horse factors and treating based on laboratory results only have caused many animals to receive lifelong drug treatment unnecessarily. Increased plasma ACTH, baseline or TRH stimulated, supports a diagnosis of PPID; however, breed, age, thriftiness, illness, coat color, geography, diet, and season also affect ACTH concentration. Insulin dysregulation, the hallmark of EMS, can result from insulin resistance or excessive postprandial insulin release. Each requires a different diagnostic test to reach a diagnosis.
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Affiliation(s)
- Dianne McFarlane
- Department of Physiological Sciences, Center for Veterinary Health Sciences, Oklahoma State University, 264 McElroy Hall, CVHS-OSU, Stillwater, OK 74078, USA.
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29
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Durham AE, Frank N, McGowan CM, Menzies-Gow NJ, Roelfsema E, Vervuert I, Feige K, Fey K. ECEIM consensus statement on equine metabolic syndrome. J Vet Intern Med 2019; 33:335-349. [PMID: 30724412 PMCID: PMC6430910 DOI: 10.1111/jvim.15423] [Citation(s) in RCA: 135] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 01/11/2019] [Indexed: 12/26/2022] Open
Abstract
Equine metabolic syndrome (EMS) is a widely recognized collection of risk factors for endocrinopathic laminitis. The most important of these risk factors is insulin dysregulation (ID). Clinicians and horse owners must recognize the presence of these risk factors so that they can be targeted and controlled to reduce the risk of laminitis attacks. Diagnosis of EMS is based partly on the horse's history and clinical examination findings, and partly on laboratory testing. Several choices of test exist which examine different facets of ID and other related metabolic disturbances. EMS is controlled mainly by dietary strategies and exercise programs that aim to improve insulin regulation and decrease obesity where present. In some cases, pharmacologic aids might be useful. Management of an EMS case is a long‐term strategy requiring diligence and discipline by the horse's carer and support and guidance from their veterinarians.
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Affiliation(s)
| | - Nicholas Frank
- Department of Clinical Sciences, Cummings School of Veterinary Medicine at Tufts University, North Grafton, Massachusetts
| | - Cathy M McGowan
- Institute of Veterinary Science, University of Liverpool, Neston, United Kingdom
| | - Nicola J Menzies-Gow
- Department of clinical sciences and services, Royal Veterinary College, Herts, United Kingdom
| | - Ellen Roelfsema
- Department of Equine Sciences, Utrecht University, Utrecht, The Netherlands
| | - Ingrid Vervuert
- Faculty of Veterinary Medicine, University of Leipzig, Institute of Animal Nutrition, Nutrition Diseases and Dietetics, Leipzig, Germany
| | - Karsten Feige
- Clinic for Horses, University of Veterinary Medicine Hannover, Germany
| | - Kerstin Fey
- Equine Clinic, Internal Medicine, Faculty of Veterinary Medicine, Justus-Liebig-University of Giessen, Giessen, Germany
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30
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Abstract
Insulin is an important polypeptide hormone that regulates carbohydrate metabolism.
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Affiliation(s)
- Yixiao Shen
- Department of Food Science
- Shenyang Agricultural University
- Shenyang
- China
| | - Witoon Prinyawiwatkul
- School of Nutrition and Food Sciences
- Louisiana State University
- Agricultural Center
- Baton Rouge
- USA
| | - Zhimin Xu
- School of Nutrition and Food Sciences
- Louisiana State University
- Agricultural Center
- Baton Rouge
- USA
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31
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Fitzgerald DM, Walsh DM, Sillence MN, Pollitt CC, de Laat MA. Insulin and incretin responses to grazing in insulin-dysregulated and healthy ponies. J Vet Intern Med 2018; 33:225-232. [PMID: 30506731 PMCID: PMC6335545 DOI: 10.1111/jvim.15363] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 10/19/2018] [Indexed: 12/27/2022] Open
Abstract
Background Supraphysiological insulin and incretin responses to a cereal‐based diet have been described in horses and ponies with insulin dysregulation (ID). However, the hormonal responses to grazing have not yet been described. Objectives To determine if there is a difference in the insulin and incretin responses to grazing pasture between insulin‐dysregulated and healthy ponies. Animals A cohort of 16 ponies comprising 5 with normal insulin regulation (NIR), 6 with moderate ID (MID), and 5 with severe ID (SID). Methods In this case‐control study, an oral glucose test (OGT) was used to determine the insulin responsiveness of each pony to PO carbohydrate before grazing pasture (4 hours) for 3 consecutive days. Serial blood samples collected during grazing were analyzed for glucose, insulin, glucose‐dependent insulinotropic peptide (GIP) and active glucagon‐like peptide‐1 (aGLP‐1), and compared among pony groups and day of pasture access. Results The area under the insulin curve when grazing increased with ID severity (P < .03). The median (range) maximal insulin concentration was greater in the MID (72.5 [129] μIU/mL) and SID (255 [338.5] μIU/mL) groups, compared to the NIR (11.7 [24.9] μIU/mL) group (P < .03) and occurred within 2‐4 hours of grazing. Postprandial OGT insulin concentration was positively correlated with 2 hours post‐grazing insulin across all 3 grazing days (P ≤ .03). The aGLP‐1 and GIP concentrations increased in response to grazing but did not differ among groups. Conclusions and Clinical Importance Grazing pasture provoked an increased insulin and incretin response in insulin‐dysregulated ponies within 4 hours of grazing. The pasture and OGT insulin concentrations were correlated.
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Affiliation(s)
- Danielle M Fitzgerald
- Department of Bioscience, Science and Engineering Faculty, Queensland University of Technology, Brisbane, Queensland, Australia
| | | | - Martin N Sillence
- Department of Bioscience, Science and Engineering Faculty, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Christopher C Pollitt
- School of Veterinary Science, University of Queensland, Gatton, Queensland, Australia
| | - Melody A de Laat
- Department of Bioscience, Science and Engineering Faculty, Queensland University of Technology, Brisbane, Queensland, Australia
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32
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Insulinaemic and glycaemic responses to three forages in ponies. Vet J 2018; 235:83-89. [DOI: 10.1016/j.tvjl.2018.03.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 03/05/2018] [Accepted: 03/28/2018] [Indexed: 02/08/2023]
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33
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Cantarelli C, Dau SL, Stefanello S, Azevedo MS, De Bastiani GR, Palma HE, Brass KE, De La Côrte FD. Evaluation of oral sugar test response for detection of equine metabolic syndrome in obese Crioulo horses. Domest Anim Endocrinol 2018; 63:31-37. [PMID: 29287187 DOI: 10.1016/j.domaniend.2017.10.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 10/16/2017] [Accepted: 10/21/2017] [Indexed: 11/28/2022]
Abstract
Owing to the high prevalence of obesity in Crioulo horses, information allowing early diagnosis of equine metabolic syndrome (EMS) and prevention of the associated laminitis is of great value. The aim of this study was to evaluate the occurrence of EMS and the response to an oral sugar test (OST) in obese Crioulo horses. Twenty-two Crioulo horses were allocated into 3 groups according to their body condition score (BCS out of 9) and presence or absence of laminitis as follows: CON (6/22), BCS < 7; OB (8/22), BCS ≥ 7; and LAM (8/22), BCS ≥7 with clinical and/or radiographic signs of laminitis. A complete clinical history was obtained, followed by a physical examination, morphometric measurements, radiographic evaluation of front feet, and ultrasonography measurements of subcutaneous body fat. For the OST, animals were fasted overnight, and blood samples were collected for glucose and insulin concentration before and after sugar administration. Morphometric and metabolic differences (P < 0.05) were observed between CON animals and obese ones, with horses from the LAM group presenting the highest morphometric measurements and insulin plasma concentrations. A delayed peak glucose response for OST was observed in the majority of obese animals, indicating that sampling between 60 and 90 min after sugar administration without glycemic curve follow-up, as previously used for hyperinsulinism detection, can be inadequate. The observed delay in the return to glucose baseline levels, combined with high insulin levels, supports the diagnosis of insulin dysregulation. These results indicate that there are clear obesity-related differences in the glucose and insulin responses of Crioulo horses to an OST.
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Affiliation(s)
- C Cantarelli
- Programa de Pós-Graduação em Medicina Veterinária, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil.
| | - S L Dau
- Programa de Pós-Graduação em Medicina Veterinária, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
| | - S Stefanello
- Programa de Pós-Graduação em Medicina Veterinária, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
| | - M S Azevedo
- Departamento de Clínica de Grandes Animais, Universidade Federal do Pampa, Uruguaiana, Rio Grande do Sul, Brazil
| | - G R De Bastiani
- Programa de Pós-Graduação em Medicina Veterinária, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
| | - H E Palma
- Programa de Pós-Graduação em Medicina Veterinária, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
| | - K E Brass
- Departamento de Clínica de Grandes Animais, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
| | - F D De La Côrte
- Departamento de Clínica de Grandes Animais, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
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Meier AD, de Laat MA, Reiche DB, Pollitt CC, Walsh DM, McGree JM, Sillence MN. The oral glucose test predicts laminitis risk in ponies fed a diet high in nonstructural carbohydrates. Domest Anim Endocrinol 2018; 63:1-9. [PMID: 29172109 DOI: 10.1016/j.domaniend.2017.10.008] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 10/24/2017] [Accepted: 10/25/2017] [Indexed: 10/18/2022]
Abstract
The aim of this study was to investigate the relationship between laminitis development in ponies and insulin/glucose concentrations in response to the oral glucose test (OGT) and a dietary challenge high in nonstructural carbohydrates (NSCs). After undergoing an OGT (1 g dextrose/kg BW in feed), 37 ponies with 2-h serum insulin concentrations ranging from 22 to 1,133 μIU/mL were subjected to a diet challenge period (DCP), consuming 12 g NSC/kg BW/d for up to 18 d. Insulin and glucose responses were measured on day 2 of the DCP. Clinical laminitis was diagnosed by blinded experts and confirmed radiographically. Basal ACTH levels and clinical signs were assessed to investigate concurrent putative pituitary pars intermedia dysfunction (PPID). The diet induced Obel grade 1 or 2 laminitis in 14 ponies (38%). The ponies that developed laminitis had higher maximum concentrations of blood glucose (P = 0.04) and serum insulin (P = 0.02) in response to the diet. The geometric mean (95% CI) blood glucose concentration for laminitis cases was 14.9 (12.9-17.2) mM, compared to 10.7 (9.2-12.5) mM for ponies who did not develop laminitis. Similarly, the geometric mean (95% CI) for serum insulin was 396 (301-520) μIU/mL for laminitis cases, compared to 216 (148-316) μIU/mL for ponies who did not develop laminitis. Laminitis incidence was likewise associated with insulin concentrations measured during the OGT. Laminitis occurred at frequencies of 0% (0/7) if postdextrose insulin (μIU/mL) was <50; 35% (8/23) if insulin was 50 to 195; and 86% (6/7) if insulin was >195 μIU/mL. Basal ACTH concentrations were above seasonally accepted reference ranges in 16/37 ponies, and 8 of these animals (50%) developed laminitis. This included all 5 ponies in the study that had clinical signs of PPID (100%). In contrast, hyperinsulinemia and laminitis occurred in only 3/11 ponies (27%) with elevated ACTH concentrations and no clinical signs of PPID (P = 0.009). Thus, laminitis occurrence was associated with higher glucose and insulin responses to both the OGT and challenge diet, and the frequency of laminitis can be predicted based on insulin and glucose hyperresponsiveness to these oral carbohydrate challenges.
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Affiliation(s)
- A D Meier
- Earth, Environmental and Biological Sciences School, Queensland University of Technology, Queensland, Australia
| | - M A de Laat
- Earth, Environmental and Biological Sciences School, Queensland University of Technology, Queensland, Australia
| | - D B Reiche
- Boehringer Ingelheim Vetmedica, Ingelheim am Rhein, Germany
| | - C C Pollitt
- Australian Equine Laminitis Research Unit, School of Veterinary Science, University of Queensland, Queensland, Australia
| | - D M Walsh
- Animal Health Foundation, Pacific, Missouri, USA
| | - J M McGree
- School of Mathematical Sciences, Queensland University of Technology, Queensland, Australia
| | - M N Sillence
- Earth, Environmental and Biological Sciences School, Queensland University of Technology, Queensland, Australia.
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35
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de Laat MA, Fitzgerald DM, Sillence MN, Spence RJ. Glucagon‐like peptide‐2: A potential role in equine insulin dysregulation. Equine Vet J 2018; 50:842-847. [DOI: 10.1111/evj.12825] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2017] [Accepted: 02/23/2018] [Indexed: 12/19/2022]
Affiliation(s)
- M. A. de Laat
- Science and Engineering Faculty Queensland University of Technology (QUT) Brisbane Queensland Australia
| | - D. M. Fitzgerald
- Science and Engineering Faculty Queensland University of Technology (QUT) Brisbane Queensland Australia
| | - M. N. Sillence
- Science and Engineering Faculty Queensland University of Technology (QUT) Brisbane Queensland Australia
| | - R. J. Spence
- Science and Engineering Faculty Queensland University of Technology (QUT) Brisbane Queensland Australia
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Jocelyn NA, Harris PA, Menzies-Gow NJ. Effect of varying the dose of corn syrup on the insulin and glucose response to the oral sugar test. Equine Vet J 2018; 50:836-841. [DOI: 10.1111/evj.12826] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 02/26/2018] [Indexed: 12/27/2022]
Affiliation(s)
- N. A. Jocelyn
- Department of Clinical Sciences and Services; Royal Veterinary College; London UK
| | - P. A. Harris
- WALTHAM Centre for Pet Nutrition; Melton Mowbray, Leicestershire UK
| | - N. J. Menzies-Gow
- Department of Clinical Sciences and Services; Royal Veterinary College; London UK
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