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Regulation and the ponderostat.

M Cabanac1

  • 1Département de physiologie, Faculté de médecine, Université Laval, Québec, Canada. michel.cabanac@phs.ulaval.ca

International Journal of Obesity and Related Metabolic Disorders : Journal of the International Association for the Study of Obesity
|February 13, 2002
PubMed
Summary

Living organisms are open systems processing energy and mass, unlike engineered systems. This study proposes a new regulation model to explain body weight stability, linking it to blood glucocorticoid levels.

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Area of Science:

  • Biophysics
  • Systems Biology
  • Control Theory

Background:

  • Control theory traditionally focuses on signal processing in engineered systems.
  • Living organisms are fundamentally different, functioning as open systems with continuous energy and mass exchange.
  • Existing models may not fully capture the complexities of biological regulation.

Purpose of the Study:

  • To propose a novel block diagram for biological regulation that accounts for energy and mass flows.
  • To apply this new model to understand the stability of body weight.
  • To hypothesize a specific mechanism for body weight regulation involving the hypothalamic-pituitary-adrenal (HPA) axis.

Main Methods:

  • Development of a new block diagram representing biological regulation as an open system.
  • Application of the model to analyze body weight stability.
  • Hypothesizing a regulatory mechanism involving blood glucocorticoids and hypothalamic set-points.

Main Results:

  • A new conceptual model for biological regulation was proposed, differentiating it from engineered systems.
  • The model was successfully applied to describe body weight stability.
  • A hypothesis was formulated suggesting the 'ponderostat' functions via blood glucocorticoid regulation.

Conclusions:

  • Living systems require a distinct regulatory framework compared to engineered systems.
  • The proposed model offers a new perspective on understanding biological stability, particularly body weight.
  • The ponderostat's regulation of blood glucocorticoids presents a testable hypothesis for weight homeostasis.

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