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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Frailty Assessment in an Aging Mouse Model
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Aging brain, brittle bone.

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  • 1Department of Pathology, Johns Hopkins University, School of Medicine, Baltimore, MD 21205, USA.

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Summary
This summary is machine-generated.

Aging brain neurons release WDFY1 via extracellular vesicles, influencing bone stem cell differentiation. This discovery reveals a new link between brain aging and bone aging processes.

Keywords:
brain agingbrain–bone connectionextracellular vesiclesneuro-skeletal axisosteoporosisskeletal aging

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Area of Science:

  • Neuroscience
  • Bone Biology
  • Cellular Aging

Background:

  • Neurons play a crucial role in regulating skeletal tissues.
  • Brain aging may impact bone health through intercellular communication.

Purpose of the Study:

  • To investigate the role of extracellular vesicles in mediating communication between aging neurons and bone cells.
  • To identify specific molecules exported by aged neurons that affect bone stem cell fate.

Main Methods:

  • Analysis of extracellular vesicle cargo from aged brain neurons.
  • In vitro studies using bone stem cells to assess the effects of WDFY1.
  • Investigation of WDFY1's intracellular trafficking pathways within bone cells.

Main Results:

  • Aged brain neurons export WD repeat and FYVE domain containing 1 (WDFY1) via extracellular vesicles.
  • Uptake of WDFY1 by bone stem cells promotes a shift from osteogenesis to adipogenesis.
  • WDFY1 utilizes retromer-dependent endosome-to-Golgi recycling in recipient cells.

Conclusions:

  • WDFY1 is a key mediator of brain aging's effect on bone.
  • This mechanism highlights a novel pathway linking neuronal aging to skeletal aging.
  • Targeting WDFY1 may offer therapeutic potential for age-related bone loss.