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Nf2-FAK signaling axis is critical for cranial bone ossification and regeneration

Junguang Liao1, Yuping Huang1, Fuju Sun1

  • 1Department of Biopharmaceutics, Zhejiang Provincial Engineering Research Center of New Technologies and Applications for Targeted Therapy of Major Diseases, College of Life Science and Medicine, Zhejiang Sci-Tech University, Hangzhou, 310018, China.

Nature Communications
|March 13, 2025
PubMed

Insights

Neurofibromin 2 (Nf2) protein Merlin is essential for cranial bone development and regeneration in mice. Nf2 loss in mesenchymal stem cells impairs bone formation, cell migration, and healing of cranial defects.

Area of Science:

  • Craniofacial development and regeneration
  • Mesenchymal stem cell biology
  • Molecular regulation of osteogenesis

Background:

  • Skeletal mesenchymal stem cells (MSCs) are crucial for craniofacial development, but their role in cranial bone formation and repair is not fully understood.
  • The neurofibromin 2 (Nf2) gene encodes the Merlin protein, vital for cellular functions, yet its specific role in craniofacial MSCs remains largely unidentified.

Purpose of the Study:

  • To investigate the function of neurofibromin 2 (Nf2)-encoded Merlin in craniofacial bone development and regeneration.
  • To elucidate the molecular mechanisms by which Nf2 regulates mesenchymal stem cell behavior and osteogenesis.

Main Methods:

  • Generation of Nf2-deficient mice in mesenchymal stem cells (MSCs).
  • Analysis of cranial bone morphology, cell proliferation, apoptosis, and osteogenesis.
  • Investigation of Nf2 interactions with focal adhesion kinase (FAK) and downstream signaling pathways (Erk1/2, PI3K/Akt).
  • Assessment of cell migration, cytoskeletal organization, and focal adhesion dynamics.

Main Results:

  • Mice lacking Nf2 in MSCs displayed cranial bone malformations, reduced proliferation, increased apoptosis, and impaired osteogenesis.
  • Nf2 physically interacts with FAK, mediating Erk1/2 and PI3K/Akt signaling pathways.
  • Disruption of the Nf2-FAK interaction led to deficient MSC migration, altered cytoskeleton, and impaired regeneration of cranial bone defects.

Conclusions:

  • Nf2-FAK acts as a crucial scaffolding complex regulating PI3K/Akt and Erk1/2 signaling in osteoblasts.
  • Nf2 is essential for coordinating cell migration, osteogenic lineage development, and cranial bone ossification and regeneration.

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