title: Effects of embryonic hypoxia on lip formation.
abstract: The upper lip is formed by the fusion of facial processes, a process in which many genetic and environmental factors are involved. Embryonic hypoxia is induced by uterine anemia and the administration of vasoconstrictors during pregnancy. To define the relationship between hypoxia and upper lip formation, hypoxic conditions were created in a whole embryo culture system. Hypoxic embryos showed a high frequency of impaired fusion, reflecting failure in the growth of the lateral nasal process (LNP). In hypoxic embryos, cell proliferation activity in the LNP mesenchyme was decreased following downregulation of genes that are involved in lip formation. We also observed upregulation of vascular endothelial growth factor expression along with the induction of apoptosis in the LNP. These results suggest that embryonic hypoxia during lip formation induces apoptosis in physiologically hypoxic regions, hypoxia-induced gene expression and downregulation of the genes involved in maxillofacial morphogenesis as immediate responses, followed by reduction of mesenchymal cell proliferation activity, resulting in insufficient growth of the facial processes.
authors.affiliation: Section of Molecular Craniofacial Embryology, Graduated School of Medical and Dental Sciences, Tokyo Medical and Dental University, Japan.
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Nagaoka
authors.forename: Shigeru
authors.initials: S
authors.lastname: Okuhara
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Sato
authors.forename: Teruo
authors.initials: T
authors.lastname: Amagasa
authors.forename: Sachiko
authors.initials: S
authors.lastname: Iseki
mesh_terms: D000818:Animals; D017209:Apoptosis; D015687:Cell Hypoxia / Q000502:physiology; D049109:Cell Proliferation; D002971:Cleft Lip / Q000209:etiology*; D046149:Embryo Culture Techniques; D005145:Face / Q000196:embryology / Q000502:physiology; D005260:Female; D018507:Gene Expression Regulation, Developmental; D000860:Hypoxia; D008046:Lip / Q000196:embryology* / Q000502:physiology*; D008648:Mesoderm; D051379:Mice; D008810:Mice, Inbred C57BL; D011247:Pregnancy