Probe Sequencing Analysis of Regenerating Lizard Tails Indicates Crosstalk Among Osteoclasts, Epidermal Cells, and...

Area of Science:

• Regenerative Biology
• Comparative Biology
• Cell Biology

Background:

• Lizards are unique amniotes capable of multilineage epimorphic regeneration, closely related to mammals.
• Tail regeneration in green anole lizards involves col3a1+ fibroblasts and krt5+ wound epidermis.
• Phagocytic cells, including macrophages and osteoclasts, are associated with blastema and wound epidermis formation, but their specific roles are unclear.

Purpose of the Study:

• To investigate the specific role of osteoclast activity in lizard tail regeneration.
• To determine how osteoclasts influence blastema and wound epidermis formation.
• To elucidate the signaling crosstalk between osteoclasts and fibroblasts during regeneration.

Main Methods:

• Probe sequencing of col3a1+ fibroblasts at regenerative timepoints.
• Treatment with zoledronic acid (ZA), an osteoclast inhibitor.
• Transcriptomic profiling of fibroblasts from ZA-treated and control lizards.

Main Results:

• Osteoclast inhibition via ZA significantly stunted lizard tail regrowth.
• ZA treatment impaired fibroblast ability to form pro-regenerative extracellular matrix.
• Inhibition of osteoclasts limited the capacity of fibroblasts to support wound epidermis formation.

Conclusions:

• Osteoclast activity is essential for blastema formation and successful tail regeneration in lizards.
• Crosstalk between osteoclasts and fibroblasts is a key regulatory mechanism for blastema and wound epidermis development.
• These findings highlight the importance of osteoclasts in coordinating cellular responses for epimorphic regeneration.