title: Study of molecular and granular layer of dentate gyrus of female rats neonatally treated with estrogen.
abstract: The proliferation of hippocampal dentate gyrus granule cells was investigated using (3)H-thymidine incorporation in control and estrogen-treated rats. Newborn 3-day old female Wistar rats were treated with a single dose of 1 mg of estradiol and 30 microCi (3)H-thymidine, and were sacrificed when 10 days old. The total number of neurons and the number of labeled granule cells in the granular layer and its subdivisions of both suprapyramidal and infrapyramidal limbs were analyzed using a stereological method. In both limbs, the total number of neurons as well as the total number of labeled granule cells in the granular layer were significantly increased in treated rats compared to corresponding controls. The thicknesses of the molecular and the granular layers and their subdivisions of both suprapyramidal and infrapyramidal limbs were analyzed using a stereological method. In treated female rats the molecular layer (ML) in both limbs was significantly decreased, and the granular layer (GL) was significantly increased in suprapyramidal limb. However, in the infrapyramidal limb an increased number of labeled cells in treated animals were significant in all particular zones of the granular layer. In the suprapyramidal limb's granular layer a significant increase in labeled cells was observed in subgranular zone (SGZ). Our results suggest a differential effect of estradiol on thicknesses of the ML and the GL, and dentate gyrus granule cells proliferation through the early rat life.
authors.affiliation: Department of Anatomy, Faculty of Veterinary Medicine, Belgrade, Serbia.
authors.forename: Dmitar
authors.initials: D
authors.lastname: Drekić
authors.forename: Milan S
authors.initials: MS
authors.lastname: Prostran
authors.forename: Milos
authors.initials: M
authors.lastname: Duka
authors.forename: Vitomir
authors.initials: V
authors.lastname: Ranković
authors.forename: Mirko
authors.initials: M
authors.lastname: Kerkez
authors.forename: Dejan
authors.initials: D
authors.lastname: Stefanović
authors.forename: Milica S
authors.initials: MS
authors.lastname: Prostran
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001345:Autoradiography; D002452:Cell Count; D003594:Cytoplasmic Granules / Q000187:drug effects / Q000648:ultrastructure; D018891:Dentate Gyrus / Q000033:anatomy & histology* / Q000187:drug effects / Q000254:growth & development; D004958:Estradiol / Q000031:analogs & derivatives* / Q000494:pharmacology; D005260:Female; D009474:Neurons / Q000187:drug effects; D011712:Pyramidal Tracts / Q000166:cytology / Q000187:drug effects / Q000254:growth & development; D051381:Rats; D013936:Thymidine / Q000378:metabolism
chemical_list: D004958:Estradiol; C023482:estradiol dipropionate; D013936:Thymidine