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2015 ; 30
(9
): 1560-71
Nephropedia Template TP
gab.com Text
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English Wikipedia
SOXC Transcription Factors Induce Cartilage Growth Plate Formation in Mouse
Embryos by Promoting Noncanonical WNT Signaling
#MMPMID25761772
Kato K
; Bhattaram P
; Penzo-Méndez A
; Gadi A
; Lefebvre V
J Bone Miner Res
2015[Sep]; 30
(9
): 1560-71
PMID25761772
show ga
Growth plates are specialized cartilage structures that ensure the elongation of
most skeletal primordia during vertebrate development. They are made by
chondrocytes that proliferate in longitudinal columns and then progress in a
staggered manner towards prehypertrophic, hypertrophic and terminal maturation.
Complex molecular networks control the formation and activity of growth plates,
but remain incompletely understood. We investigated here the importance of the
SoxC genes, which encode the SOX4, SOX11 and SOX12 transcription factors, in
growth plates. We show that the three genes are expressed robustly in
perichondrocytes and weakly in growth plate chondrocytes. SoxC(Prx1Cre) mice,
which deleted SoxC genes in limb bud skeletogenic mesenchyme, were born with tiny
appendicular cartilage primordia because of failure to form growth plates. In
contrast, SoxC(Col2Cre) and SoxC(ATC) mice, which deleted SoxC genes primarily in
chondrocytes, were born with mild dwarfism and fair growth plates. Chondrocytes
in the latter mutants matured normally, but formed irregular columns,
proliferated slowly and died ectopically. Asymmetric distribution of VANGL2 was
defective in both SoxC(Prx1Cre) and SoxC(ATC) chondrocytes, indicating impairment
of planar cell polarity, a noncanonical WNT signaling pathway that controls
growth plate chondrocyte alignment, proliferation and survival. Accordingly, SoxC
genes were necessary in perichondrocytes for expression of Wnt5a, which encodes a
noncanonical WNT ligand required for growth plate formation, and in chondrocytes
and perichondrocytes for expression of Fzd3 and Csnk1e, which encode a WNT
receptor and casein kinase-1 subunit mediating planar cell polarity,
respectively. Reflecting the differential strengths of the SOXC protein
transactivation domains, SOX11 was more powerful than SOX4, and SOX12 interfered
with the activity of SOX4 and SOX11. Altogether, these findings provide novel
insights into the molecular regulation of skeletal growth by proposing that SOXC
proteins act cell- and non-cell-autonomously in perichondrocytes and chondrocytes
to establish noncanonical WNT signaling crosstalk essential for growth plate
induction and control.