Lipotoxicity in the pathogenesis of obesity-dependent NIDDM: Genetic and clinical implications

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Abstract

We review evidence that increased tissue levels of fatty acyl CoA cause the β-cell abnormalities of nondiabetic obesity and ultimately result in obesity-dependent diabetes. Nondiabetic obesity in Zucker rats is characterized by hypersecretion of insulin at normal fasting and subfasting glucose concentrations. This is a result of β-cell hyperplasia and increased low K(m) glucose usage and oxidation. These abnormalities, the hyperinsulinemia, the hyperplasia of β-cells, i.e., its in vitro equivalent, enhanced bromodeoxyuridine incorporation, and the increased low K(m) glucose usage can be induced by culturing normal islets with 2 mmol/l free fatty acids (FFAs). Once obese Zucker diabetic fatty rats become diabetic, glucose- stimulated insulin secretion (GSIS) is absent and β-cell GLUT2 reduced. Islet triglyceride (TG) content is increased 10-fold, probably reflecting increased FFA delivery (plasma FFA levels >1.5 mmol/l) beginning about 2 weeks before the onset of diabetes. These β-cell abnormalities, GSIS loss, GLUT2 loss, and TG accumulation, are prevented by reducing plasma FFAs by caloric restriction and by nicotinamide injection. The loss of GSIS and the accumulation of TGs, but not the GLUT2 loss, can be induced in vitro in normal islets cultured in a 2 mmol/l FFA-containing medium, but prediabetic islets seem far more vulnerable to FFA-induced functional impairment and TG accumulation. It is proposed that in uncomplicated obesity, increased lipid availability (FFA levels <1.5 mmol/l) induces both hyperinsulinemia and insulin resistance in parallel fashion, thereby maintaining normoglycemia. A further increase in substrate overload impairs β-cell compensation for insulin resistance and hyperglycemia appears.

Original languageEnglish (US)
Pages (from-to)863-870
Number of pages8
JournalDiabetes
Volume44
Issue number8
StatePublished - 1995

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Nonesterified Fatty Acids
Type 2 Diabetes Mellitus
Obesity
Glucose
Insulin
Triglycerides
Hyperinsulinism
Hyperplasia
Insulin Resistance
Zucker Rats
Caloric Restriction
Acyl Coenzyme A
Niacinamide
Bromodeoxyuridine
Hyperglycemia
Fasting
Lipids
Injections

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Internal Medicine

Cite this

Lipotoxicity in the pathogenesis of obesity-dependent NIDDM : Genetic and clinical implications. / Unger, Roger H.

In: Diabetes, Vol. 44, No. 8, 1995, p. 863-870.

Research output: Contribution to journalArticle

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