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Related Experiment Videos

Insulin secretion in Walker 256 tumor cachexia.

L C Fernandes1, U F Machado, C R Nogueira

  • 1Department of Physiology and Biophysics, São Paulo University, Brazil.

The American Journal of Physiology
|June 1, 1990
PubMed
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Cachexia in tumor-bearing rats significantly reduces insulin secretion from pancreatic islets. This impaired insulin release, linked to calcium changes, contributes to low insulin levels and cachexia development.

Area of Science:

  • Endocrinology
  • Metabolic Syndrome
  • Oncology

Background:

  • Cachexia is a complex metabolic syndrome associated with underlying illness, characterized by involuntary weight loss.
  • Cancer cachexia significantly impacts patient outcomes and quality of life.
  • The precise mechanisms linking cachexia to metabolic dysregulation, particularly insulin secretion, require further elucidation.

Purpose of the Study:

  • To investigate the impact of cachexia on insulin secretion in a rat model.
  • To determine the relationship between tumor burden, cachexia, and pancreatic islet function.
  • To explore the role of calcium dynamics in altered insulin secretion during cachexia.

Main Methods:

  • Utilized the Walker 256 tumor implantation model in adult male rats.

Related Experiment Videos

  • Isolated islets of Langerhans from tumor-bearing and control rats.
  • Measured insulin secretion in response to glucose stimulation.
  • Assessed 45Ca2+ outflow rate from isolated islets.

    • Main Results:

    • Islets from tumor-bearing rats exhibited significantly reduced insulin secretion compared to controls when stimulated by glucose.
    • A significant alteration in the 45Ca2+ outflow rate was observed in islets from cachectic rats.
    • Tumor-bearing rats displayed markedly reduced plasma insulin levels (approximately one-third of control levels).

    Conclusions:

    • Reduced insulin secretion in response to glucose is a key feature of cachexia in this model.
    • Impaired insulin release, potentially mediated by altered calcium handling, contributes to the low insulinemia observed in cachexia.
    • These findings suggest that compromised pancreatic islet function is an important factor in the pathogenesis of cachexia associated with Walker 256 tumors.