title: Evidence of the occurrence of calcitonin cells in the ultimobranchial follicle of the rat postnatal thyroid.
abstract: A study on thyroid glands of Wistar rats of ages ranging from 1 to 120 days was carried out. The glands were serially sectioned and stained for calcitonin using the peroxidase antiperoxidase method. All the thyroids contained ultimobranchial follicles (UBF) located partially embedded among the usual follicles but in a 5-day-old rat this structure showed an unusual position in the interstitium of connective tissue between the cartilage of the trachea and the thyroid gland. We have observed in the wall of that UBF the presence not only of resting C cells but also mitotic figures of C cells. Furthermore, on the opposite side of the same UBF an active area of formation of thyroid follicles was found. These observations provided the first evidence of the contribution of the UBF in the formation of C cells during the postnatal life of the rat. Furthermore, it is suggested that some C cells may share a common origin with ultimobranchially derived follicular cells.
authors.affiliation: Departmento de Citología e Histología, Normal y Patológica, Facultad de Medicina, Sevilla, España.
authors.forename: I
authors.initials: I
authors.lastname: Martin-Lacave
authors.forename: E
authors.initials: E
authors.lastname: Conde
authors.forename: A
authors.initials: A
authors.lastname: Moreno
authors.forename: J C
authors.initials: JC
authors.lastname: Utrilla
authors.forename: H
authors.initials: H
authors.lastname: Galera-Davidson
mesh_terms: D000375:Aging / Q000502:physiology*; D000818:Animals; D000831:Animals, Newborn; D002116:Calcitonin / Q000032:analysis*; D007124:Immunoenzyme Techniques; D051381:Rats; D011919:Rats, Inbred Strains; D013961:Thyroid Gland / Q000166:cytology* / Q000254:growth & development
chemical_list: D002116:Calcitonin