作者: H. Akiyama , J.-E. Kim , K. Nakashima , G. Balmes , N. Iwai
关键词: Stem cell 、 Mesenchymal stem cell 、 Intramembranous ossification 、 Mesenchyme 、 Biology 、 Molecular biology 、 Chondrogenesis 、 Cellular differentiation 、 Limb bud 、 Cell fate determination
摘要: The transcription factor Sox9 is expressed in all chondroprogenitors and has an essential role chondrogenesis. also other tissues, including central nervous system, neural crest, intestine, pancreas, testis, endocardial cushions, plays a crucial cell proliferation differentiation several of these tissues. To determine the fate Sox9-expressing cells during mouse embryogenesis, we generated mice which Cre recombinase gene preceded by internal ribosome entry site was inserted into 3′ untranslated region (Sox9-Cre knock-in). In developing skeleton, before Runx2, early osteoblast marker gene. Cell mapping using Sox9-Cre;ROSA26 reporter (R26R) revealed that limb bud mesenchymal gave rise to both chondrocytes osteoblasts. Furthermore, mutant Osterix inactivated exhibited lack endochondral intramembranous ossification mature osteoblasts comparable with Osterix-null mutants. addition, contributed tendon synovium formation. By Sox9-Cre;R26R mice, were able systematically follow from embryonic day 8.0 17.0. Our results showed formation types spinal cord, epithelium mesenchyme testis. Thus, our strongly suggest osteo-chondroprogenitor cells, as well progenitors variety are derived precursors embryogenesis.