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| Open AccessStem cells of the suture mesenchyme in craniofacial bone development, repair and regeneration
The suture mesenchyme has been postulated to act as the niche for stem cells for calvarial bones but the identity of the stem cells is unknown. Here, Maruyama et al.suggest that Axin2 expressing cells act as stem cells not only in craniofacial bone development and homeostasis but in injury-induced repair.
- Takamitsu Maruyama
- , Jaeim Jeong
- & Wei Hsu
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Article
| Open AccessEvolutionary innovation and conservation in the embryonic derivation of the vertebrate skull
It is unclear whether the embryonic origin of skull bones is evolutionarily conserved. Here, the authors show that the pattern of cranial development of the Mexican axolotl is similar to that reported for other vertebrates, but the pattern in the African clawed frog, another amphibian, is unique.
- Nadine Piekarski
- , Joshua B. Gross
- & James Hanken
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NAA10 controls osteoblast differentiation and bone formation as a feedback regulator of Runx2
N-alpha-acetyltransferase 10 (NAA10) regulates cell growth and proliferation. Here the authors show that NAA10 also has a role in osteogenesis, by fine-tuning the activity of the osteogenic transcription factor Runx2.
- Haejin Yoon
- , Hye-Lim Kim
- & Jong-Wan Park
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Article
| Open AccessCalcitonin controls bone formation by inhibiting the release of sphingosine 1-phosphate from osteoclasts
The regulatory role of calcitonin in bone homeostasis is well studied, yet its molecular activity is poorly understood. The authors show that calcitonin regulates bone cells function by inhibiting the osteoclast secretion of sphingosine 1-phosphate, a lipid mediator of osteoclast–osteoblast crosstalk.
- Johannes Keller
- , Philip Catala-Lehnen
- & Michael Amling
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DJ-1 promotes angiogenesis and osteogenesis by activating FGF receptor-1 signaling
Osteoblasts and endothelial cells have important roles in bone regeneration. Kim and colleagues identify the protein DJ-1 as an angiogenic and osteogenic signalling molecule involved in the cross-talk between these cells and show that DJ-1 promotes bone regeneration and fracture healing in mice.
- Jung-Min Kim
- , Hong-In Shin
- & Pann-Ghill Suh
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Insight into the early evolution of the avian sternum from juvenile enantiornithines
The keeled sternum is a distinct skeletal element in extant birds. In this study, specimens of juvenile extinct birds—Enantiornithes—from the Early Cretaceous show a unique sequence of development in the sternum, suggesting differences between living birds and this extinct clade.
- Xiaoting Zheng
- , Xiaoli Wang
- & Zhonghe Zhou