Alteration of Apoptosis in Cleft Palate Formation and Ectomesenchymal Stem Cells Influenced by Retinoic Acid

作者：Fumihiko Suwa, Yan Jin, Hongbing Lu, Xin Li, George L. Tipoe, Thomas Lau, Yoshitaka Tamada, K. Kuroki, Yi Fang · 发表于：Okajimas Folia Anatomica Japonica · 年份：2001 · DOI：10.2535/ofaj1936.78.5_179 · 被引用次数：16 · 研究领域：Cleft Lip and Palate Research、Pediatric Hepatobiliary Diseases and Treatments

It has been shown that apoptosis is involved in normal embryonic development. The aim of the present study was to elucidate the role and alteration of apoptosis in the pathogenesis of cleft palate induced by retinoic acid (RA) and the ectomesenchymal stem (EMS) cells influenced by RA. RA was administered by gavage to pregnant C57BL/6N strain mice in the experimental group, and the control group received oil alone. Pregnant mice were killed at set periods of time thereafter and histologically analyzed. EMS cells explanted from the palatal shelves of embryonic mice were cultured and characterized by immunohistochemistry, growth curves and population-doubling time. The alterations of apoptosis of EMS cells and developing palatal shelves influenced by RA were evaluated by the terminal deoxynucleotidyl transferase-mediated UTP-biotin nick end-labeling (TUNEL) method. RA-treated mice showed formation of cleft palates resulted from the small size of the palatal shelves and their failure to lift. TUNEL staining showed that the number of apoptotic mesenchymal cells in palatal shelves in the RA-treated mice was increased significantly when compared with the control group. The primary culture of EMS cells proceeded successfully. The population-doubling time of RA-treated cells was much longer compared with non-treated EMS cells. RA also dramatically increased the number of apoptotic cells in EMS cells in vitro. We concluded that EMS cells are the crucial cells in palate development. RA ...