A team of researchers at Kyoto University (Center for iPS Cell Research and Application, CiRA) has achieved an unprecedented scientific milestone: the generation of three-dimensional organoids resembling the human mandible from induced pluripotent stem cells (iPSCs). It is the first time that such a complex bone tissue as the mandible—known for its distinct structure compared to other skeletal bones—has been reproduced in the laboratory.
The study, published in the international journal Nature Biomedical Engineering, opens new perspectives both in regenerative medicine and in the development of models for studying rare genetic diseases. How was it possible? Creating a jawbone in the laboratory had until now been considered extremely difficult. The mandible, in fact, develops from highly specific embryonic cells (ectomesenchyme of the first pharyngeal arch) and follows a different ossification process compared to the long bones of the body. Through a sequence of 3D cell culture steps, the researchers guided the iPSCs along this unique developmental pathway. Within a few weeks, the cells formed calcified microstructures with osteoblasts and osteocytes organized into three-dimensional networks—key features of mandibular bone tissue. Experimental results

• Bone regeneration in mice: by transplanting these organoids into small mandibular bone defects, the researchers observed the formation of new bone tissue comparable to that of a conventional graft.
• Disease models: starting from iPSCs obtained from patients with osteogenesis imperfecta (“brittle bone disease”), the team reproduced the typical abnormalities of the condition. By correcting the genetic mutation in the same cells, the organoids instead gave rise to healthy bone.
• Scientific versatility: these organoids represent a reliable model for studying mandibular development and testing future therapeutic strategies.

Why is it important? The mandible is essential for vital functions such as chewing, breathing, and speech. Gum diseases, tumors, or trauma can cause severe bone loss. Generating mandibular tissue from a patient’s own cells opens the way to personalized regenerative therapies. A future to build today These results represent a promising advancement, but they are still experimental (the study is not yet part of clinical trials) and not “ready-to-use cures.” However, they point to a concrete direction for future developments. In this context, EternaCell’s mission takes on strategic value: preserving one’s cells today could, in the future, enable access to advanced and personalized regenerative therapies, once they are validated and approved. Sources

1. Official press release from CiRA (Center for iPS Cell Research and Application, Kyoto University): Laying the foundation for future jawbone research, July 2, 2025. cira.kyoto-u.ac.jp
2. Motoike, S., Inada, Y., Toguchida, J. et al. Jawbone-like organoids generated from human pluripotent stem cells. Nat. Biomed. Eng (2025). https://doi.org/10.1038/s41551-025-01419-3https://doi.org/10.1038/s41551-025-01419-3
3. The Japan Times, August 19, 2025. japantimes.co.jp