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2015 ; 8
(8
): 12076-85
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gab.com Text
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Epithelial-mesenchymal transition and mesenchymal-epithelial transition response
during differentiation of growth-plate chondrocytes in endochondral ossification
#MMPMID26550119
Zhou S
; Shen Y
; Wang L
; Li P
Int J Clin Exp Med
2015[]; 8
(8
): 12076-85
PMID26550119
show ga
For linear longitudinal bone elongation, the stem-like progenitor chondrocytes
distributed in resting zone (RZ) of growth plate have a capacity to differentiate
towards the spindle chondrocytes in proliferative zone (PZ), then towards the
columnar and tightly adjacent chondrocytes in hypertrophic zone (HZ). We
hypothesized this process of endochondral ossification with cells morphological
change was occurred along with the inter-conversion between epithelial to
mesenchymal cell types. Consistent with this hypothesis, our study demonstrated
the chondrocytes highly expressed mesenchymal-like biomarkers and loss of
epithelial surface markers in PZ, while converse in RZ and HZ of the growth plate
in mice distal tibia in vivo. To further determine these process and correlation
regulatory pathway, the 4-week old male and female mice were treated with
estradiol cypionate or oxandrolone, then investigated the response of epithelial-
and mesenchymal biomarkers, and demonstrated that estrogen blocked the EMT
process from RZ to PZ while androgen promoted MET from PZ to HZ. Our observations
supported the hypotheses that the growth plate firstly go through EMT from RZ to
PZ, then MET process from PZ to HZ during the epiphyseal fusion. Our results
could interpret the different roles of estrogen and androgen in growth plate
cartilage when endochondral ossification.