The role of the Hippo-signaling pathway, an evolutionarily conserved organ size control pathway, in cranial bone development and regeneration is poorly understood. We specifically inactivated the Hippo component Salv, and Hippo downstream effectors Yap and Taz in the cranial neural crest (CNC) using the Wnt1cre driver and Wnt1cre2SOR drivers. Salv conditional knock-out (CKO) mutants had dramatically enlarged calvarial bones and cranial sutures with increased calvarial bone density, whereas mutants of Taz homozygous and Yap heterozygous CKO had a range of survival times from E14.5 to postnatal 8 weeks with a range of calvarial bone defects with Wormian bones and decreased calvarial bone density. Notably, our preliminary data suggested that expression and subcellular localization of Yap changes upon Hippo kinase activity, extracellular matrix rigidity and Notch signaling activity. In this proposed K01 study, we investigate the function of Hippo signaling and Yap/Taz mediated signaling crosstalk during cranial bone development and regeneration and will study three aims: 1) To investigate the hypothesis that Hippo signaling and extracellular environment cooperatively regulate osteoblast proliferation and differentiation during cranial bone formation; 2) To investigate the signaling cross talk between Hippo and Notch signaling during cranial bone development; 3) To identify novel target genes of Hippo signaling during cranial bone development and regeneration. My research will focus on bone regeneration and treatment of severely injured bone. This K01 study will provide preliminary data and potential targets in bone regenerative medicine for my subsequent R01 application.

Public Health Relevance

The studies proposed in this K01 award will investigate the signal crosstalk among Hippo signaling, extracellular environment and Notch signaling during cranial bone formation, as well as identify novel targets of Hippo-Yap pathway during cranial bone development and regeneration. My long term goal is to develop new methods to regenerate severely injured bone. This K01 will provide excellent opportunity for me to receive further training required for my future lab, and generate preliminary data for my subsequent studies and R01 application.

Agency
National Institute of Health (NIH)
Institute
National Institute of Dental & Craniofacial Research (NIDCR)
Type
Research Scientist Development Award - Research & Training (K01)
Project #
7K01DE026561-03
Application #
9926053
Study Section
NIDR Special Grants Review Committee (DSR)
Program Officer
King, Lynn M
Project Start
2019-07-01
Project End
2022-06-30
Budget Start
2019-07-01
Budget End
2020-06-30
Support Year
3
Fiscal Year
2019
Total Cost
Indirect Cost
Name
University of Texas Health Science Center Houston
Department
Pediatrics
Type
Schools of Medicine
DUNS #
800771594
City
Houston
State
TX
Country
United States
Zip Code
77030
Wang, J; Martin, J F (2017) Hippo Pathway: An Emerging Regulator of Craniofacial and Dental Development. J Dent Res 96:1229-1237
Liang, Ming; Yu, Michael; Xia, Ruohan et al. (2017) Yap/Taz Deletion in Gli+ Cell-Derived Myofibroblasts Attenuates Fibrosis. J Am Soc Nephrol 28:3278-3290