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Integration of comprehensive 3D microCT and signaling analysis reveals differential regulatory mechanisms of craniofacial bone development.

Abstract：

:Growth factor signaling regulates tissue-tissue interactions to control organogenesis and tissue homeostasis. Specifically, transforming growth factor beta (TGFβ) signaling plays a crucial role in the development of cranial neural crest (CNC) cell-derived bone, and loss of Tgfbr2 in CNC cells results in craniofacial skeletal malformations. Our recent studies indicate that non-canonical TGFβ signaling is activated whereas canonical TGFβ signaling is compromised in the absence of Tgfbr2 (in Tgfbr2(fl/fl);Wnt1-Cre mice). A haploinsufficiency of Tgfbr1 (aka Alk5) (Tgfbr2(fl/fl);Wnt1-Cre;Alk5(fl/+)) largely rescues craniofacial deformities in Tgfbr2 mutant mice by reducing ectopic non-canonical TGFβ signaling. However, the relative involvement of canonical and non-canonical TGFβ signaling in regulating specific craniofacial bone formation remains unclear. We compared the size and volume of CNC-derived craniofacial bones (frontal bone, premaxilla, maxilla, palatine bone, and mandible) from E18.5 control, Tgfbr2(fl/fl);Wnt1-Cre, and Tgfbr2(fl/fl);Wnt1-Cre;Alk5(fl/+)mice. By analyzing three dimensional (3D) micro-computed tomography (microCT) images, we found that different craniofacial bones were restored to different degrees in Tgfbr2(fl/fl);Wnt1-Cre;Alk5(fl/+) mice. Our study provides comprehensive information on anatomical landmarks and the size and volume of each craniofacial bone, as well as insights into the extent that canonical and non-canonical TGFβ signaling cascades contribute to the formation of each CNC-derived bone. Our data will serve as an important resource for developmental biologists who are interested in craniofacial morphogenesis.

journal_name

Dev Biol

journal_title

Developmental biology

authors

Ho TV,Iwata J,Ho HA,Grimes WC,Park S,Sanchez-Lara PA,Chai Y

doi

10.1016/j.ydbio.2015.02.010

subject

Has Abstract

pub_date

2015-04-15 00:00:00

pages

180-90

issue

2

eissn

0012-1606

issn

1095-564X

pii

S0012-1606(15)00068-8

journal_volume

400

pub_type

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