title: Expression of the epithelial marker E-cadherin by thyroid C cells and their precursors during murine development.
abstract: Studies of chick-quail chimeras have reported that avian ultimobranchial C cells originate from the neural crest. It has consequently been assumed, without much supporting evidence, that mammalian thyroid C cells also originate from the neural crest. To test this notion, we employed both Connexin43-lacZ and Wnt1-Cre/R26R transgenic mice, because their neural crest cells can be marked. We also examined the immunohistochemical expression of a number of markers that identify migratory or postmigratory neural crest cells, namely, TuJ1, neurofilament 160, nestin, P75NTR, and Sox10. Moreover, we examined the expression of E-cadherin, an epithelial cell marker. At embryonic day (E)10.5, the neural crest cells densely populated the pharyngeal arches but were not distributed in the pharyngeal pouches, including the fourth pouch. At E11.5, the ultimobranchial rudiment formed from the fourth pouch and was located close to the fourth arch artery. At E13.0, this organ came into contact with the thyroid lobe, and at E13.5, it fused with this lobe. However, the ultimobranchial body was not colonized by neural crest-derived cells at any of these developmental stages. Instead, all ultimobranchial cells, as well as the epithelium of the fourth pharyngeal pouch, were intensely immunoreactive for E-cadherin. Furthermore, confocal microscopy of newborn mouse thyroid glands revealed colocalization of calcitonin and E-cadherin in the C cells. The cells, however, were not marked in the Wnt-Cre/R26R mice. These results indicated that murine thyroid C cells are derived from the endodermal epithelial cells of the fourth pharyngeal pouch and do not originate from neural crest cells.
authors.affiliation: Department of Anatomy, Kitasato University School of Medicine, Sagamihara, Kanagawa 228-8555, Japan. kameda@med.kitasato-u.ac.jp
authors.forename: Yoko
authors.initials: Y
authors.lastname: Kameda
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Nishimaki
authors.forename: Osamu
authors.initials: O
authors.lastname: Chisaka
authors.forename: Sachiko
authors.initials: S
authors.lastname: Iseki
authors.forename: Henry M
authors.initials: HM
authors.lastname: Sucov
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D015415:Biomarkers / Q000378:metabolism; D015820:Cadherins / Q000096:biosynthesis*; D002116:Calcitonin / Q000378:metabolism*; D002465:Cell Movement; D018031:Connexin 43 / Q000235:genetics; D047108:Embryonic Development; D004847:Epithelial Cells / Q000378:metabolism*; D007150:Immunohistochemistry; D019426:Integrases / Q000235:genetics; D007763:Lac Operon; D051379:Mice; D008822:Mice, Transgenic; D018613:Microscopy, Confocal; D009432:Neural Crest / Q000166:cytology / Q000196:embryology / Q000378:metabolism; D011401:Promoter Regions, Genetic; D011506:Proteins / Q000235:genetics; D022661:RNA, Untranslated; D013234:Stem Cells / Q000378:metabolism*; D013961:Thyroid Gland / Q000166:cytology / Q000196:embryology / Q000378:metabolism*; D051155:Wnt1 Protein / Q000235:genetics
chemical_list: D015415:Biomarkers; D015820:Cadherins; D018031:Connexin 43; C110853:Gt(ROSA)26Sor non-coding RNA, mouse; D011506:Proteins; D022661:RNA, Untranslated; D051155:Wnt1 Protein; C495246:Wnt1 protein, mouse; D002116:Calcitonin; C045073:Cre recombinase; D019426:Integrases