Integration of Comprehensive 3D MicroCT and Signaling Analysis Reveals Differential Regulatory Mechanisms of Craniofacial Bone Development

Overview

Journal Dev Biol

Publisher Elsevier

Specialties Biology
Reproductive Medicine

Date 2015 Feb 28

PMID 25722190

Citations 26

Authors

Thach-Vu Ho

Junichi Iwata

Hoang Anh Ho

Weston C Grimes

Shery Park

Pedro A Sanchez-Lara

Yang Chai

Affiliations

Soon will be listed here.

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.

Citing Articles

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Craniofacial bone anomalies related to cholesterol synthesis defects.

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Canonical Wnt signaling is not required for expression in the basal medial edge epithelium during palatogenesis.

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