TY  - JOUR
TI  - The TGF-beta type III receptor is localized to the medial edge epithelium during palatal fusion.
AU  - Cui, X M
AU  - Shuler, C F
T2  - The International Journal of Developmental Biology
AB  - During palatal fusion, the medial edge epithelial cells (MEE) but not the oral/nasal palatal epithelium, selectively undergo epithelial-mesenchymal transformation. It is known that this process is regulated, at least in part, by endogenous TGF-beta3. One conceivable mechanism is that restricted expression of TGF-beta receptors (TbetaRs) in a subpopulation of cells may localize TGF-beta responsiveness (Brown et al., 1999). However, TGF-beta type II receptor (TbetaR-II) is expressed by all palatal epithelial cells during palatal fusion (Cui et al., 1998) and therefore cannot localize TGF-beta3 responsiveness. To investigate the role of TGF-beta type III receptor (TbetaR-III) in MEE transformation, we examined the expression pattern of TbetaR-III in the developing palate from E12 to E15 mice in vivo and in vitro by immunohistochemistry and compared the expression pattern to that of type I receptor (TbetaR-I). The expression of TbetaR-III was temporo-spatially restricted to the MEE during palatal fusion, while the expression of TbetaR-I was primarily localized in all palatal epithelia, consistent with the expression patterns of TbetaR-II and TGF-beta3 (Cui et al., 1998). These results support our hypothesis that TbetaR-III localizes and mediates the developmental role of TGF-beta3 on MEE transformation by specific expression in the MEE. TbetaR-III may modulate TGF-beta3 binding to TbetaR-II in the MEE cells to locally enhance TGF-beta3 autocrine signaling through the TbetaR-I/TbetaR-II receptor complex, which contributes to MEE selective epithelial-mesenchymal transformation.
PY  - 2000
VL  - 44
IS  - 4
SP  - 397
EP  - 402
J2  - Int. J. Dev. Biol.
LA  - en
SN  - 0214-6282
SN  - 1696-3547
UR  - https://ijdb.ehu.eus/article/10949049
Y2  - 2024/12/22/13:17:40
ER  -