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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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The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which...
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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Related Experiment Video

Updated: Jan 13, 2026

Evaluation of Synapse Density in Hippocampal Rodent Brain Slices
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Brain neuron-derived WDFY1 induces bone loss.

Chun-Yuan Chen1,2,3, Zun Wang4,5, Chun-Gu Hong4,5

  • 1Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, China. chency19@csu.edu.cn.

Nature Aging
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Summary
This summary is machine-generated.

Aged brain neurons release excess WDFY1 protein via extracellular vesicles (EVs), causing bone loss and osteoporosis. Suppressing this protein improves skeletal health, revealing a new brain-bone communication pathway.

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Area of Science:

  • Neuroscience
  • Bone Biology
  • Aging Research

Background:

  • Skeletal aging involves decreased bone formation and increased marrow fat.
  • The brain's role in skeletal aging and bone-fat imbalance was previously unknown.

Purpose of the Study:

  • To investigate if the aged brain contributes to skeletal aging and bone-fat imbalance.
  • To identify the molecular mechanisms linking brain changes to bone health.

Main Methods:

  • Analysis of WDFY1 protein levels in aged brain neurons and bone.
  • Genetic manipulation of WDFY1 expression in the brain.
  • Inhibition of neuronal extracellular vesicle (EV) release.
  • Investigation of WDFY1's molecular interactions within neurons.

Main Results:

  • Aged brain neurons, particularly in the hippocampus and cortex, overproduce WDFY1 protein.
  • Excess neuronal WDFY1 is transferred to bone via EVs, promoting marrow adiposity and inhibiting osteogenesis.
  • Increased brain WDFY1 accelerates skeletal aging; WDFY1 suppression or reduced EV release improves bone health.
  • WDFY1 interacts with the retromer complex, affecting endosome-Golgi trafficking of cathepsin D and peroxiredoxin 2.

Conclusions:

  • Aged brain neuronal EVs act as critical messengers, transferring WDFY1 to bone and driving bone-fat imbalance and osteoporosis.
  • Targeting brain WDFY1 or neuronal EV release presents a potential therapeutic strategy for age-related bone loss.