Mechanical sensing protein PIEZO1 regulates bone homeostasis via osteoblast-osteoclast crosstalk

Lijun Wang, Xiuling You, Sutada Lotinun, Lingli Zhang, Nan Wu and Weiguo Zou ()
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Lijun Wang: University of Chinese Academy of Sciences
Xiuling You: University of Chinese Academy of Sciences
Sutada Lotinun: Chulalongkorn University
Lingli Zhang: University of Chinese Academy of Sciences
Nan Wu: Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences
Weiguo Zou: University of Chinese Academy of Sciences

Nature Communications, 2020, vol. 11, issue 1, 1-12

Abstract: Abstract Wolff’s law and the Utah Paradigm of skeletal physiology state that bone architecture adapts to mechanical loads. These models predict the existence of a mechanostat that links strain induced by mechanical forces to skeletal remodeling. However, how the mechanostat influences bone remodeling remains elusive. Here, we find that Piezo1 deficiency in osteoblastic cells leads to loss of bone mass and spontaneous fractures with increased bone resorption. Furthermore, Piezo1-deficient mice are resistant to further bone loss and bone resorption induced by hind limb unloading, demonstrating that PIEZO1 can affect osteoblast-osteoclast crosstalk in response to mechanical forces. At the mechanistic level, in response to mechanical loads, PIEZO1 in osteoblastic cells controls the YAP-dependent expression of type II and IX collagens. In turn, these collagen isoforms regulate osteoclast differentiation. Taken together, our data identify PIEZO1 as the major skeletal mechanosensor that tunes bone homeostasis.

Date: 2020
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DOI: 10.1038/s41467-019-14146-6

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