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Title: Polycystin-1 interacts with TAZ to stimulate osteoblastogenesis and inhibit adipogenesis

Journal Article · · Journal of Clinical Investigation
DOI:https://doi.org/10.1172/JCI93725· OSTI ID:1435199
ORCiD logo [1];  [2];  [1];  [1];  [3];  [3];  [3];  [4];  [4];  [2];  [1]
  1. Univ. of Tennessee Health Science Center, Memphis, TN (United States). Dept. of Medicine
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). UT/ORNL Center for Molecular Biophysics; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Biochemistry and Cellular and Molecular Biology
  3. Univ. of Tennessee Health Science Center, Memphis, TN (United States). Dept. of Pharmaceutical Sciences
  4. Univ. of Tennessee Health Science Center, Memphis, TN (United States). Dept. of Physiology

The molecular mechanisms that transduce the osteoblast response to physical forces in the bone microenvironment are poorly understood. In this paper, we used genetic and pharmacological experiments to determine whether the polycystins PC1 and PC2 (encoded by Pkd1 and Pkd2) and the transcriptional coactivator TAZ form a mechanosensing complex in osteoblasts. Compound-heterozygous mice lacking 1 copy of Pkd1 and Taz exhibited additive decrements in bone mass, impaired osteoblast-mediated bone formation, and enhanced bone marrow fat accumulation. Bone marrow stromal cells and osteoblasts derived from these mice showed impaired osteoblastogenesis and enhanced adipogenesis. Increased extracellular matrix stiffness and application of mechanical stretch to multipotent mesenchymal cells stimulated the nuclear translocation of the PC1 C-terminal tail/TAZ (PC1-CTT/TAZ) complex, leading to increased runt-related transcription factor 2–mediated (Runx2-mediated) osteogenic and decreased PPARγ-dependent adipogenic gene expression. Using structure-based virtual screening, we identified a compound predicted to bind to PC2 in the PC1:PC2 C-terminal tail region with helix:helix interaction. This molecule stimulated polycystin- and TAZ-dependent osteoblastogenesis and inhibited adipogenesis. Therefore, we show that polycystins and TAZ integrate at the molecular level to reciprocally regulate osteoblast and adipocyte differentiation, indicating that the polycystins/TAZ complex may be a potential therapeutic target to increase bone mass.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee Health Science Center, Memphis, TN (United States)
Sponsoring Organization:
USDOE; National Inst. of Health (NIH) (United States)
Grant/Contract Number:
AC05-00OR22725; R01-DK083303; R01-AR045955; R01-AR37308; HL123540; HL131526
OSTI ID:
1435199
Journal Information:
Journal of Clinical Investigation, Vol. 128, Issue 1; ISSN 0021-9738
Publisher:
American Society for Clinical InvestigationCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Cited By (9)

Tumor mechanosensing and its therapeutic potential journal February 2018
Polycystins in disease mechanobiology journal November 2018
Polycystin-1 Regulates Actomyosin Contraction and the Cellular Response to Extracellular Stiffness journal November 2019
Polycystin-1 regulates bone development through an interaction with the transcriptional coactivator TAZ journal September 2018
Sal B targets TAZ to facilitate osteogenesis and reduce adipogenesis through MEK‐ERK pathway journal March 2019
Long noncoding RNA Bmncr regulates mesenchymal stem cell fate during skeletal aging journal October 2018
IRS-1 increases TAZ expression and promotes osteogenic differentiation in rat bone marrow mesenchymal stem cells journal December 2018
Polycystins in Colorectal Cancer journal December 2018
Polycystins and Mechanotransduction in Human Disease journal May 2019

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