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Hypothalamic mTOR: the rookie energy sensor.

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  • 1(P.B. Martínez de Morentin) Department of Physiology, School of Medicine-CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela (IDIS), 15782, Spain & CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Spain. pablo.blanco@usc.es.

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The target of rapamycin (TOR) pathway, especially mTOR in the hypothalamus, is crucial for sensing cellular energy and nutrients. Understanding hypothalamic TOR

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Area of Science:

  • Cellular Biology
  • Metabolic Regulation
  • Neuroendocrinology

Background:

  • Cellular function relies on integrating energy and nutrient signals for growth and division.
  • The target of rapamycin (TOR) pathway, conserved across species, senses nutrient, energy, and growth factor availability.
  • Dysregulation of TOR complexes (mTORC1 and mTORC2) is linked to aging, obesity, and cancer.

Purpose of the Study:

  • To review the role of the hypothalamic TOR complex in cellular energy sensing.
  • To focus on metabolic pathways involving hypothalamic TOR.
  • To highlight the importance of hypothalamic TOR in cellular and whole-body energy management.

Main Methods:

  • Review of recent scientific literature on the target of rapamycin (TOR) pathway.
  • Analysis of studies investigating hypothalamic TOR function in energy homeostasis.
  • Examination of metabolic pathways regulated by hypothalamic TOR.

Main Results:

  • Hypothalamic TOR regulates central food intake and body weight via leptin and ghrelin signaling.
  • Peripheral TOR influences adipogenesis and lipogenesis, impacting liver metabolism.
  • Chronic mTOR activation is associated with beta-cell expansion and insulin resistance.

Conclusions:

  • Hypothalamic TOR acts as a critical metabolic sensor for cellular and organismal energy balance.
  • Understanding mTOR and its interplay with AMPK is key to comprehending homeostasis.
  • Further insights into hypothalamic mTOR may offer therapeutic strategies for metabolic diseases.