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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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Analysis and Imaging of Osteocytes
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Piezo1 opposes age-associated cortical bone loss.

Xuehua Li1,2, Connie Zhang1,2, Hayden H Bowman1,2

  • 1Department of Orthopaedic Surgery, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA.

Aging Cell
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Aging bone loss is linked to reduced mechanical signaling. Declining Piezo1 expression worsens bone loss by increasing resorption, highlighting Piezo1

Keywords:
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Area of Science:

  • Bone Biology
  • Mechanobiology
  • Aging Research

Background:

  • Age-related bone loss is a significant health concern, often linked to reduced mechanical stimulation.
  • The mechanosensitive ion channel Piezo1 is crucial for bone health and responding to mechanical cues.
  • Understanding Piezo1's role in aging bone is vital for developing targeted interventions.

Purpose of the Study:

  • To investigate the role of Piezo1 in age-associated cortical bone loss.
  • To determine if reduced Piezo1 expression contributes to increased bone resorption with aging.
  • To explore the molecular mechanisms by which Piezo1 influences bone homeostasis.

Main Methods:

  • Examined Piezo1 expression levels in aging murine and human cortical bone.
  • Utilized genetically modified mice with Piezo1 deficiency in osteoblasts and osteocytes.
  • Assessed cortical bone parameters, endocortical resorption, and Tnfrsf11b (OPG) expression.

Main Results:

  • Piezo1 expression significantly decreases with age in both mouse and human bone.
  • Loss of Piezo1 in bone cells accelerated age-associated cortical bone loss, driven by increased endocortical resorption.
  • Piezo1 deficiency led to reduced expression of OPG (Tnfrsf11b), suggesting a mechanism for increased osteoclast activity.

Conclusions:

  • Reduced Piezo1 expression is a key factor in age-related cortical bone loss.
  • Piezo1 protects against bone loss by suppressing osteoclast formation, partly through promoting OPG expression.
  • Targeting Piezo1-mediated mechanical signaling may offer a therapeutic strategy for age-related bone diseases.