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AgRP Neurons Regulate Bone Mass.

Jae Geun Kim1, Ben-Hua Sun2, Marcelo O Dietrich3

  • 1Program in Integrative Cell Signaling and Neurobiology of Metabolism, Section of Comparative Medicine, Yale University School of Medicine, New Haven, CT 06520, USA; Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University, Incheon 406-772, Republic of Korea.

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Hunger-promoting AgRP neurons regulate bone mass. Impairing these neurons or their Ucp2 gene causes osteopenia, a condition of reduced bone density, which can be reversed by restoring Ucp2 function.

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Area of Science:

  • Neuroendocrinology
  • Skeletal Biology
  • Metabolic Regulation

Background:

  • The hypothalamus plays a role in skeletal metabolism.
  • The specific impact of hunger-promoting arcuate nucleus (AgRP) neurons on bone is unknown.

Purpose of the Study:

  • To investigate the role of AgRP neurons in regulating bone mass.
  • To determine the molecular mechanisms by which AgRP neurons influence skeletal homeostasis.

Main Methods:

  • Generated genetically modified mouse models with altered AgRP neuronal function (Ucp2 deletion, Sirt1 deletion, leptin receptor deletion).
  • Assessed bone mass and microstructure in these mouse models.
  • Manipulated sympathetic nervous system activity in specific mouse models.

Main Results:

  • Mice with impaired AgRP neuronal function (Ucp2 deletion) exhibited osteopenia, which was rescued by restoring Ucp2 expression in AgRP neurons.
  • Early postnatal deletion of AgRP neurons or cell-autonomous Sirt1 deletion in AgRP neurons also led to reduced bone mass.
  • Leptin receptor deletion in AgRP neurons did not affect bone homeostasis.
  • Suppression of sympathetic tone reversed osteopenia in AgRP-Sirt1(-/-) mice.

Conclusions:

  • AgRP neurons play a significant role in regulating skeletal bone metabolism.
  • This regulation is independent of leptin signaling.
  • Sympathetic nervous system activity is involved in AgRP neuron-mediated bone regulation.