Tracing Cellular Senescence in Bone: Time-Dependent Changes in Osteocyte Cytoskeleton Mechanics and Morphology
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View abstract on PubMed
Summary
This summary is machine-generated.Senescent osteocytes contribute to age-related bone loss. This study reveals that changes in osteocyte stiffness and structure, influenced by senescence-associated secretory phenotype (SASP) factors, can reliably identify aging bone cells.
Area Of Science
- Biomedical Engineering
- Cell Biology
- Gerontology
Background
- Aging-related bone loss, including osteoporosis, affects a growing global elderly population.
- Senescent osteocytes are key contributors to bone aging.
- Senescence-associated secretory phenotype (SASP) factors are implicated in cellular aging.
Purpose Of The Study
- To investigate the impact of local and paracrine senescence-associated secretory phenotype (SASP) factor exposure on osteocyte senescence.
- To evaluate biophysical and biomolecular markers for identifying senescent osteocytes.
Main Methods
- Longitudinal study design.
- Analysis of cytoskeletal stiffening, F-actin area, and dendritic integrity in osteocytes.
- Measurement of pro-inflammatory cytokine levels and osteocyte-specific gene expression.
- Assessment of local and paracrine SASP factor exposure effects.
Main Results
- Irradiated osteocytes exhibited significant cytoskeletal stiffening, increased F-actin areas, and reduced dendritic integrity.
- These biophysical changes correlated with altered pro-inflammatory cytokine profiles and gene expression.
- Local SASP factor accumulation demonstrated a greater impact on osteocyte properties than paracrine effects.
- Biophysical markers proved reliable for identifying senescent osteocytes.
Conclusions
- Osteocyte mechanical and morphological properties serve as reliable, time-dependent biophysical markers of senescence.
- Local SASP exposure has a more significant effect on osteocyte aging than paracrine exposure.
- These findings offer insights for non-invasive identification of senescent osteocytes and potential therapeutic strategies against age-related bone loss.
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