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2016 ; 1
(4
): e86254
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NFAT restricts osteochondroma formation from entheseal progenitors
#MMPMID27158674
Ge X
; Tsang K
; He L
; Garcia RA
; Ermann J
; Mizoguchi F
; Zhang M
; Zhou B
; Zhou B
; Aliprantis AO
JCI Insight
2016[Apr]; 1
(4
): e86254
PMID27158674
show ga
Osteochondromas are common benign osteocartilaginous tumors in children and
adolescents characterized by cartilage-capped bony projections on the surface of
bones. These tumors often cause pain, deformity, fracture, and musculoskeletal
dysfunction, and they occasionally undergo malignant transformation. The
pathogenesis of osteochondromas remains poorly understood. Here, we demonstrate
that nuclear factor of activated T cells c1 and c2 (NFATc1 and NFATc2) suppress
osteochondromagenesis through individual and combinatorial mechanisms. In mice,
conditional deletion of NFATc1 in mesenchymal limb progenitors,
Scleraxis-expressing (Scx-expressing) tendoligamentous cells, or postnatally in
Aggrecan-expressing cells resulted in osteochondroma formation at entheses, the
insertion sites of ligaments and tendons onto bone. Combinatorial deletion of
NFATc1 and NFATc2 gave rise to larger and more numerous osteochondromas in
inverse proportion to gene dosage. A population of entheseal NFATc1- and
Aggrecan-expressing cells was identified as the osteochondroma precursor,
previously believed to be growth plate derived or perichondrium derived.
Mechanistically, we show that NFATc1 restricts the proliferation and
chondrogenesis of osteochondroma precursors. In contrast, NFATc2 preferentially
inhibits chondrocyte hypertrophy and osteogenesis. Together, our findings
identify and characterize a mechanism of osteochondroma formation and suggest
that regulating NFAT activity is a new therapeutic approach for skeletal diseases
characterized by defective or exaggerated osteochondral growth.