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Related Experiment Videos

Islet metabolism: recent acquisitions

W J Malaisse, A Sener

    Acta Biologica Et Medica Germanica
    |January 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Isolated pancreatic islets utilize endogenous fuels for sustained oxygen consumption, with L-glutamine being a primary energy source. L-glutamine also significantly boosts insulin release when combined with specific amino acids.

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    Area of Science:

    • Metabolic pathways in pancreatic islet cells
    • Endocrine function and nutrient metabolism

    Background:

    • Pancreatic islets require continuous energy for basal functions.
    • The role of endogenous fuels in islet metabolism is not fully understood.

    Purpose of the Study:

    • To investigate the fuel sources for isolated pancreatic rat islets.
    • To determine the effect of L-glutamine on islet metabolism and insulin secretion.

    Main Methods:

    • Isolated pancreatic rat islets were deprived of exogenous nutrients.
    • Oxygen consumption rates were measured.
    • The impact of glucose and L-glutamine on insulin release was assessed.

    Main Results:

    • Islets maintained O2 consumption without exogenous nutrients, indicating endogenous fuel utilization.

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  • Glucose had minimal impact on endogenous nutrient utilization.
  • L-glutamine was actively metabolized and enhanced insulin release stimulated by L-leucine and b(-)BCH.

    • Conclusions:

    • Circulating L-glutamine is proposed as a major fuel for basal energy expenditure in pancreatic islets.
    • L-glutamine serves as a substrate for glutamate dehydrogenase and potentiates amino acid-stimulated insulin secretion.