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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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Spatial transcriptomics reveals metabolic changes underly age-dependent declines in digit regeneration.

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Mammalian digit regeneration relies on blastema cells. Targeting blastema cell metabolism with oxaloacetate enhances bone regeneration in aged mice, offering a promising strategy to improve healing.

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Area of Science:

  • Biomedical Science
  • Regenerative Medicine
  • Molecular Biology

Background:

  • Mammalian limb regeneration is limited, primarily occurring at the distal digit tip.
  • The blastema, a collection of dedifferentiated cells, is crucial for skeletal and soft tissue regeneration.
  • Understanding blastema formation and function is key to unlocking regenerative potential.

Purpose of the Study:

  • To characterize the transcriptional profile of the blastema using spatial transcriptomics.
  • To investigate age-related changes in blastema function and identify mechanisms of impaired regeneration.
  • To explore metabolic interventions for enhancing bone regeneration in aged mammals.

Main Methods:

  • Spatial transcriptomics was employed to analyze blastema transcriptional profiles.
  • A mouse model of digit amputation was used to study young and aged mice.
  • Gene expression signatures were developed and validated against existing single-cell RNA-sequencing data.

Main Results:

  • A highly specific gene signature for blastema cells was identified.
  • Aged mice exhibited impaired digit regeneration compared to young mice.
  • Aged blastemas showed a metabolic shift, increased hypoxia, and excessive vascularization, leading to altered bone architecture.

Conclusions:

  • Cellular metabolism plays a critical role in age-related decline of tissue regeneration.
  • Oxaloacetate administration improved WNT signaling and enhanced in vivo bone regeneration in aged mice.
  • Targeting cellular metabolism presents a potential therapeutic strategy for improving regenerative capacity in aging populations.