Neural control of the anorexia-cachexia syndrome

Alessandro Laviano, Akio Inui, Daniel L. Marks, Michael M. Meguid, Claude Pichard, Filippo Rossi Fanelli, Marilia Seelaender

Research output: Contribution to journalReview article

92 Scopus citations

Abstract

The anorexia-cachexia syndrome is a debilitating clinical condition characterizing the course of chronic diseases, which heavily impacts on patients' morbidity and quality of life, ultimately accelerating death. The pathogenesis is multifactorial and reflects the complexity and redundancy of the mechanisms controlling energy homeostasis under physiological conditions. Accumulating evidence indicates that, during disease, disturbances of the hypothalamic pathways controlling energy homeostasis occur, leading to profound metabolic changes in peripheral tissues. In particular, the hypothalamic melanocortin system does not respond appropriately to peripheral inputs, and its activity is diverted largely toward the promotion of catabolic stimuli (i.e., reduced energy intake, increased energy expenditure, possibly increased muscle proteolysis, and adipose tissue loss). Hypothalamic proinflammatory cytokines and serotonin, among other factors, are key in triggering hypothalamic resistance. These catabolic effects represent the central response to peripheral challenges (i.e., growing tumor, renal, cardiac failure, disrupted hepatic metabolism) that are likely sensed by the brain through the vagus nerve. Also, disease-induced changes in fatty acid oxidation within hypothalamic neurons may contribute to the dysfunction of the hypothalamic melanocortin system. Ultimately, sympathetic outflow mediates, at least in part, the metabolic changes in peripheral tissues. Other factors are likely involved in the pathogenesis of the anorexia-cachexia syndrome, and their role is currently being elucidated. However, available evidence shows that the constellation of symptoms characterizing this syndrome should be considered, at least in part, as different phenotypes of common neurochemical/metabolic alterations in the presence of a chronic inflammatory state.

Original languageEnglish (US)
Pages (from-to)E1000-E1008
JournalAmerican Journal of Physiology - Endocrinology and Metabolism
Volume295
Issue number5
DOIs
StatePublished - Nov 1 2008

Keywords

  • Cytokines
  • Malonyl-coenzyme A
  • Melanocortin
  • Serotonin
  • Sympathetic output
  • Vagus nerve

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Physiology
  • Physiology (medical)

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  • Cite this

    Laviano, A., Inui, A., Marks, D. L., Meguid, M. M., Pichard, C., Fanelli, F. R., & Seelaender, M. (2008). Neural control of the anorexia-cachexia syndrome. American Journal of Physiology - Endocrinology and Metabolism, 295(5), E1000-E1008. https://doi.org/10.1152/ajpendo.90252.2008