Brian P Heubel1, Carson A Bredesen2, Thomas F Schilling3, Pierre Le Pabic2. 1. Department of Biological Sciences, University of Delaware, Newark, Delaware, USA. 2. Department of Biology and Marine Biology, University of North Carolina Wilmington, Wilmington, North Carolina, USA. 3. Department of Developmental and Cell Biology, University of California Irvine, Irvine, California, USA.
Abstract
BACKGROUND: Endochondral ossification is a major bone forming mechanism in vertebrates, defects in which can result in skeletal dysplasia or craniofacial anomalies in humans. The zebrafish holds great potential to advance our understanding of endochondral growth zone development and genetics, yet several important aspects of its biology remain unexplored. Here we provide a comprehensive description of endochondral growth zones in the pharyngeal skeleton, including their developmental progression, cellular activity, and adult fates. RESULTS: Postembryonic growth of the pharyngeal skeleton is supported by endochondral growth zones located either at skeletal epiphyses or synchondroses. Col2a1a and col10a1a in situ hybridization and anti-PCNA immunostaining identify resting-, hypertrophic- and proliferative zones, respectively, in pharyngeal synchondroses. Cellular hypertrophy and matrix deposition contribute little, if at all, to axial growth in most skeletal elements. Zebrafish endochondral growth zones develop during metamorphosis and arrest in adults. CONCLUSIONS: Two endochondral growth zone configurations in the zebrafish pharyngeal skeleton produce either unidirectional (epiphyses) or bidirectional (synchondroses) growth. Cell proliferation drives endochondral growth and its modulation, in contrast to mammalian long bones in which bone length depends more on cell enlargement during hypertrophy and intramembranous ossification is the default mechanism of bone growth in zebrafish adults.
BACKGROUND: Endochondral ossification is a major bone forming mechanism in vertebrates, defects in which can result in skeletal dysplasia or craniofacial anomalies in humans. The zebrafish holds great potential to advance our understanding of endochondral growth zone development and genetics, yet several important aspects of its biology remain unexplored. Here we provide a comprehensive description of endochondral growth zones in the pharyngeal skeleton, including their developmental progression, cellular activity, and adult fates. RESULTS: Postembryonic growth of the pharyngeal skeleton is supported by endochondral growth zones located either at skeletal epiphyses or synchondroses. Col2a1a and col10a1a in situ hybridization and anti-PCNA immunostaining identify resting-, hypertrophic- and proliferative zones, respectively, in pharyngeal synchondroses. Cellular hypertrophy and matrix deposition contribute little, if at all, to axial growth in most skeletal elements. Zebrafish endochondral growth zones develop during metamorphosis and arrest in adults. CONCLUSIONS: Two endochondral growth zone configurations in the zebrafish pharyngeal skeleton produce either unidirectional (epiphyses) or bidirectional (synchondroses) growth. Cell proliferation drives endochondral growth and its modulation, in contrast to mammalian long bones in which bone length depends more on cell enlargement during hypertrophy and intramembranous ossification is the default mechanism of bone growth in zebrafish adults.
Authors: Elizabeth E LeClair; Stephanie R Mui; Angela Huang; Jolanta M Topczewska; Jacek Topczewski Journal: Dev Dyn Date: 2009-10 Impact factor: 3.780
Authors: Ines Foessl; J H Duncan Bassett; Åshild Bjørnerem; Björn Busse; Ângelo Calado; Pascale Chavassieux; Maria Christou; Eleni Douni; Imke A K Fiedler; João Eurico Fonseca; Eva Hassler; Wolfgang Högler; Erika Kague; David Karasik; Patricia Khashayar; Bente L Langdahl; Victoria D Leitch; Philippe Lopes; Georgios Markozannes; Fiona E A McGuigan; Carolina Medina-Gomez; Evangelia Ntzani; Ling Oei; Claes Ohlsson; Pawel Szulc; Jonathan H Tobias; Katerina Trajanoska; Şansın Tuzun; Amina Valjevac; Bert van Rietbergen; Graham R Williams; Tatjana Zekic; Fernando Rivadeneira; Barbara Obermayer-Pietsch Journal: Front Endocrinol (Lausanne) Date: 2021-12-01 Impact factor: 5.555