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PathophysiologyNCT04268862

Metabolic Defects in Prediabetic Kuwaiti Arabs and Indians

An observational study of Pathophysiology and Metabolic Glucose Disorders, run by Dasman Diabetes Institute at 1 site in Kuwait.

Unknown status

Status not confirmed. The sponsor has not verified this record for over two years, so it may be out of date.

Official record
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Trial summary

Insulin resistance and beta cell dysfunction are the major core defects responsible for the development of type 2 diabetes (T2DM). Although insulin resistance is the early metabolic defect detected in subjects destined to develop T2DM, it is the beta cell failure which is responsible for the development of… Read more about this study

Who is it for?
Ages 21 to 65 yearsHealthy volunteers can take part
Conditions the study is for
Pathophysiology, Metabolic Glucose Disorders
How many people
120 participants
Where
1 siteKuwait
Study dates
1 Mar 2020to 31 Dec 2021
Phase
Observational
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 21 to 65 years
  • All sexes
  • Healthy volunteers accepted
  • Adult, Older adult

Study population: Subjects from two ethnic groups will participate in the present study: (1) 60 Kuwaiti Arab subjects and (2) 60 subjects of Indian ethnicity. Each ethnic group will include 30 subjects with normal glucose tolerance (NGT), and 30 subjects with impaired glucose tolerance (IGT) according to the American Diabetes Association criteria. Subjects in each ethnic group will be matched for age, sex, BMI and family history of type 2 diabetes.

Who may be able to join

  • age 21-65 years
  • BMI=18-45 kg/m2
  • NGT (FPG<100 mg/dl and 2-hour PG <140 mg/dl) or IGT (FPG < 125 mg/dl, and 2-hour PG=140-199 mg/dl) according to the ADA criteria.
  • Good general health as determined by physical exam, medical history, blood chemistries, CBC, TSH, T4, lipid profile.
  • Stable body weight (± 3 lbs) over the preceding three months
  • Not participate in an excessively heavy exercise program.

Who cannot join

  • Subjects with
  • Haematocrit < 34.0
  • Diabetes, Thyroid disorders, Cardiovascular Diseases, Cancer, Bronchial Asthma and any autoimmune disease.
  • Subjects who receive medications which affect glucose tolerance, e.g. Steroids
  • Subjects who participate in excessively heavy exercise programs, e.g. Athletes

Trial locations and contacts

1 site in 1 country.

Kuwait1 site, 1 recruiting
  • Dasman Diabetes Institute

    Kuwait City, 15462

    Recruiting

Other trials in Kuwait

About this study

Official title: Ethnic Dependence of the Metabolic Defects in Prediabetic Individuals: Kuwaiti Arabs Versus Indians

Insulin resistance and beta cell dysfunction are the major core defects responsible for the development of type 2 diabetes (T2DM). Although insulin resistance is the early metabolic defect detected in subjects destined to develop T2DM, it is the beta cell failure which is responsible for the development of hyperglycemia.

Longitudinal and cross-sectional studies have demonstrated that, initially, the compensatory hyperinsulinemia is sufficient to offset the insulin resistance and maintain normal glucose tolerance. However, when the beta cell fails to adequately compensate for the insulin resistance, glucose homeostasis deteriorates. Initially, this is manifest as impaired glucose tolerance (IGT) and later as overt diabetes. It follows that the level of beta cell failure at which hyperglycemia becomes evident depends upon the prevailing level of insulin resistance. A more severe insulin resistance results in development of overt hyperglycemia at lower level of beta cell failure. The investigators previously have shown that the severity of insulin resistance varies amongst different ethnic groups (Arabs versus Indians). Thus, the level of beta cell failure at which overt hyperglycemia becomes evident amongst each ethnic group also varies. Thus, individuals/ethnic groups with more severe insulin resistance, overt hyperglycemia becomes evident at lower level of beta cell dysfunction. Conversely, severe beta cell dysfunction is required for evert hyperglycemia to develop in individuals/ethnicities with less severe insulin resistance.

In the present study, the investigators aim to quantitate beta cell function with the gold standard technique (i.e. hyperglycemic clamp) in Arab and Indian non-diabetic individuals and relate the level of beta cell function to the prevailing level of insulin resistance measured as the glucose infusion rate divided by the mean plasma insulin concentration during the clamp.

Read the detailed description

Insulin resistance and the accompanying hyperinsulinemia also lead to the development of multiple metabolic abnormalities which are responsible, at least in part, for the excessive risk of coronary heart disease in T2DM , non-alcoholic steatohepatitis (NASH), and impaired diastolic left ventricular (LV) function. Thus, insulin resistance contributes, not only to increased T2DM risk, but also to the morbidity and mortality associated with the disease.

Etiology of Insulin Resistance Insulin resistance is closely related to obesity. Multiple mechanisms contribute to insulin resistance in obese individuals. Accumulation of fat in insulin target tissues (i.e. ectopic fat), e.g. in myocytes and hepatocytes, plays a central role in the pathogenesis of insulin resistance. When energy intake exceeds energy expenditure, the energy excess is stored in subcutaneous adipocytes in the form of triglycerides. However, under conditions of persistent positive energy balance, subcutaneous fat stores become filled and the excess energy spills over into the circulation in the form of FFA, leading to increased fat content in lean tissues, i.e. ectopic fat. Many studies have documented the important role of ectopic fat content in the pathogenesis of insulin resistance in obese individuals. The severity of insulin resistance in skeletal muscle and liver strongly correlates with ectopic fat content in myocytes and hepatocytes, respectively. Further, therapies that deplete ectopic fat, e.g. weight loss and pioglitazone, significantly improve insulin sensitivity.

Fat spill over and the subsequent increase in ectopic fat content in lean tissues could result from subcutaneous fat cells that are filled to capacity or the inability of the subcutaneous fat stores to expand. Consistent with this hypothesis, several studies have demonstrated increased fat cell size in subcutaneous fat in insulin resistant obese individuals compared to insulin sensitive controls. Moreover, large fat cells have a higher rate of lipolysis and decreased rate of FFA esterification compared to small fat cells, suggesting decreased ability of large fat cells to further store fat in subcutaneous adipose tissue in obese individuals. Of note, large fat cell size is a strong predictor of future T2DM risk in non-diabetic individuals, independent of insulin resistance. Collectively, these results have led to the hypothesis that inability of subcutaneous fat tissue to expand results in fat spill over into muscle, liver, heart, etc and the subsequent development of insulin resistance.

Keywords
Beta cell function, Insulin Resistance, Arabs, Asian Indians
Medical subject headings
Glucose Metabolism Disorders, Insulin Resistance

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Insulin Resistance

    Insulin Resistance measured as total glucose disposal TGD with the Insulin Clamp

    Measured: 15 months

  2. Insulin Secretion

    First phase and second phase insulin secretion measured with the hyperglycemic clamp

    Measured: 15 months

  3. Beta Cell function

    Beta cell function for the first phase and second phase measured as ∆C-Pep/(1/TGD)

    Measured: 15 months

  4. Comparison of genetic markers

    Genetic markers that correlate with the metabolic phenotype measured using GWAS

    Measured: 15 months

  5. GLP1 Action

    GLP1 Action measured as increase in C-peptide during the hyperglycemic clamp caused by exenatide infusion

    Measured: 15 months

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted13 Feb 2020
  2. Study start1 Mar 2020
  3. Primary completion15 Jul 2021 (estimated)
  4. Study completion31 Dec 2021 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Observational
Observational model
Cohort
Time perspective
Cross-sectional
Enrolment
120 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT04268862
Sponsor's protocol ID
RA HM-2019-003
Status last verified
Jul 2020
First submitted
20 Oct 2019
Last updated
22 Jul 2020
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No

Publications

  • Defronzo RA. Banting Lecture. From the triumvirate to the ominous octet: a new paradigm for the treatment of type 2 diabetes mellitus. Diabetes. 2009 Apr;58(4):773-95. doi: 10.2337/db09-9028. No abstract available.

    PubMed 19336687
  • Abdul-Ghani MA, DeFronzo RA. Pathophysiology of prediabetes. Curr Diab Rep. 2009 Jun;9(3):193-9. doi: 10.1007/s11892-009-0032-7.

    PubMed 19490820
  • DeFronzo RA. Insulin resistance, lipotoxicity, type 2 diabetes and atherosclerosis: the missing links. The Claude Bernard Lecture 2009. Diabetologia. 2010 Jul;53(7):1270-87. doi: 10.1007/s00125-010-1684-1. Epub 2010 Apr 2.

    PubMed 20361178
  • Clarke GD, Solis-Herrera C, Molina-Wilkins M, Martinez S, Merovci A, Cersosimo E, Chilton RJ, Iozzo P, Gastaldelli A, Abdul-Ghani M, DeFronzo RA. Pioglitazone Improves Left Ventricular Diastolic Function in Subjects With Diabetes. Diabetes Care. 2017 Nov;40(11):1530-1536. doi: 10.2337/dc17-0078. Epub 2017 Aug 28.

    PubMed 28847910
  • Abdul-Ghani MA, DeFronzo RA. Pathogenesis of insulin resistance in skeletal muscle. J Biomed Biotechnol. 2010;2010:476279. doi: 10.1155/2010/476279. Epub 2010 Apr 26.

    PubMed 20445742
  • Eckel RH, Kahn SE, Ferrannini E, Goldfine AB, Nathan DM, Schwartz MW, Smith RJ, Smith SR. Obesity and type 2 diabetes: what can be unified and what needs to be individualized? J Clin Endocrinol Metab. 2011 Jun;96(6):1654-63. doi: 10.1210/jc.2011-0585.

    PubMed 21602457
  • Lettner A, Roden M. Ectopic fat and insulin resistance. Curr Diab Rep. 2008 Jun;8(3):185-91. doi: 10.1007/s11892-008-0032-z.

    PubMed 18625114
  • Sabag A, Way KL, Keating SE, Sultana RN, O'Connor HT, Baker MK, Chuter VH, George J, Johnson NA. Exercise and ectopic fat in type 2 diabetes: A systematic review and meta-analysis. Diabetes Metab. 2017 Jun;43(3):195-210. doi: 10.1016/j.diabet.2016.12.006. Epub 2017 Feb 2.

    PubMed 28162956
  • Lundgren M, Svensson M, Lindmark S, Renstrom F, Ruge T, Eriksson JW. Fat cell enlargement is an independent marker of insulin resistance and 'hyperleptinaemia'. Diabetologia. 2007 Mar;50(3):625-33. doi: 10.1007/s00125-006-0572-1. Epub 2007 Jan 10.

    PubMed 17216279
  • Weyer C, Foley JE, Bogardus C, Tataranni PA, Pratley RE. Enlarged subcutaneous abdominal adipocyte size, but not obesity itself, predicts type II diabetes independent of insulin resistance. Diabetologia. 2000 Dec;43(12):1498-506. doi: 10.1007/s001250051560.

    PubMed 11151758
  • McLaughlin T, Craig C, Liu LF, Perelman D, Allister C, Spielman D, Cushman SW. Adipose Cell Size and Regional Fat Deposition as Predictors of Metabolic Response to Overfeeding in Insulin-Resistant and Insulin-Sensitive Humans. Diabetes. 2016 May;65(5):1245-54. doi: 10.2337/db15-1213. Epub 2016 Feb 16.

    PubMed 26884438
  • Badoud F, Perreault M, Zulyniak MA, Mutch DM. Molecular insights into the role of white adipose tissue in metabolically unhealthy normal weight and metabolically healthy obese individuals. FASEB J. 2015 Mar;29(3):748-58. doi: 10.1096/fj.14-263913. Epub 2014 Nov 19.

    PubMed 25411437
  • Arner P, Engfeldt P, Ostman J. Relationship between lipolysis, cyclic AMP, and fat-cell size in human adipose tissue during fasting and in diabetes mellitus. Metabolism. 1979 Mar;28(3):198-209. doi: 10.1016/0026-0495(79)90065-9.

    PubMed 216883
  • Scherer PE. The Multifaceted Roles of Adipose Tissue-Therapeutic Targets for Diabetes and Beyond: The 2015 Banting Lecture. Diabetes. 2016 Jun;65(6):1452-61. doi: 10.2337/db16-0339.

    PubMed 27222389
  • Bays H, Mandarino L, DeFronzo RA. Role of the adipocyte, free fatty acids, and ectopic fat in pathogenesis of type 2 diabetes mellitus: peroxisomal proliferator-activated receptor agonists provide a rational therapeutic approach. J Clin Endocrinol Metab. 2004 Feb;89(2):463-78. doi: 10.1210/jc.2003-030723. No abstract available.

    PubMed 14764748

Questions about this trial

What is this clinical trial studying?

An observational study of Pathophysiology and Metabolic Glucose Disorders, run by Dasman Diabetes Institute at 1 site in Kuwait.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 6 inclusion and 5 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: status not confirmed, as of the sponsor's last update on 22 Jul 2020. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Kuwait. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

Results are not available in the source record.

How can a doctor refer a patient or contact the research team?

Contact Ebaa AlOzairi, Md, PhD (+965 22242999 ext. 3111, ebaa.alozairi@dasmaninstitute.org), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Insulin Resistance (time frame: 15 months). The study lists 5 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT04268862, which also lists 15 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 22 Jul 2020; AzTrials last refreshed its copy on 6 Nov 2026.

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