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Palovarotene Inhibits Osteochondroma Formation in a Mouse Model of Multiple Hereditary Exostoses
Author(s) -
Inubushi Toshihiro,
Lemire Isabelle,
Irie Fumitoshi,
Yamaguchi Yu
Publication year - 2018
Publication title -
journal of bone and mineral research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.882
H-Index - 241
eISSN - 1523-4681
pISSN - 0884-0431
DOI - 10.1002/jbmr.3341
Subject(s) - fibrodysplasia ossificans progressiva , hereditary multiple exostoses , osteochondroma , cancer research , retinoic acid , endocrinology , mutation , genetic disorder , medicine , biology , chemistry , gene , anatomy , genetics , ossification
Multiple hereditary exostoses (MHE), also known as multiple osteochondromas (MO), is an autosomal dominant disorder characterized by the development of multiple cartilage‐capped bone tumors (osteochondromas). The large majority of patients with MHE carry loss‐of‐function mutations in the EXT1 or EXT2 gene, which encodes a glycosyltransferase essential for heparan sulfate (HS) biosynthesis. Increasing evidence suggests that enhanced bone morphogenetic protein (BMP) signaling resulting from loss of HS expression plays a role in osteochondroma formation in MHE. Palovarotene (PVO) is a retinoic acid receptor γ selective agonist, which is being investigated as a potential drug for fibrodysplasia ossificans progressiva (FOP), another genetic bone disorder with features that overlap with those of MHE. Here we show that PVO inhibits osteochondroma formation in the Fsp1 Cre ;Ext1 flox/flox model of MHE. Four‐week daily treatment with PVO starting at postnatal day (P) 14 reduced the number of osteochondromas that develop in these mice by up to 91% in a dose‐dependent manner. An inhibition of long bone growth observed in animals treated from P14 was almost entirely abrogated by delaying the initiation of treatment to P21. We also found that PVO attenuates BMP signaling in Fsp1 Cre ;Ext1 flox/flox mice and that aberrant chondrogenic fate determination of Ext1 ‐deficient perichondrial progenitor cells in these mice is restored by PVO. Together, the present data support further preclinical and clinical investigations of PVO as a potential therapeutic agent for MHE. © 2017 American Society for Bone and Mineral Research.