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Insulin Secretion, Sensitivity, and Kidney Function in Young Individuals With Type 2 Diabetes.

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Youth with type 2 diabetes show significant beta-cell dysfunction, leading to high blood pressure within the kidneys and increased kidney oxygen levels. These findings highlight potential risks for kidney injury in this population.

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Area of Science:

  • Pediatric Endocrinology
  • Nephrology
  • Metabolic Disorders

Background:

  • Type 2 diabetes in youth is linked to increased kidney injury risk.
  • Beta-cell dysfunction and insulin resistance are key contributors.
  • The impact on kidney hemodynamics and oxygenation in adolescents is not well understood.

Purpose of the Study:

  • To investigate the relationship between beta-cell function, insulin resistance, and kidney parameters in youth with type 2 diabetes.
  • To compare these parameters with obese and normal-weight controls.

Main Methods:

  • Fifty youth with type 2 diabetes, 21 obese controls, and 20 normal-weight controls were studied.
  • Methods included clearance studies for GFR and renal plasma flow, kidney MRI for oxygenation, hyperglycemic clamp for insulin secretion and disposition index (DI), and DXA for body composition.

Main Results:

  • Youth with type 2 diabetes had significantly lower DI and acute C-peptide response to glucose (ACPRg), and higher urine albumin-to-creatinine ratio (UACR) and intraglomerular pressure compared to obese controls.
  • Both type 2 diabetes and obese groups showed higher GFR and kidney oxygen availability (relative hyperoxia) than normal-weight controls.
  • Lower DI correlated with higher intraglomerular pressure and kidney hyperoxia.

Conclusions:

  • Adolescents with type 2 diabetes exhibit severe beta-cell dysfunction.
  • This dysfunction is associated with intraglomerular hypertension and kidney hyperoxia.
  • Obese controls showed similar, though less pronounced, alterations.