ENVIRONMENTAL-FACTORS MODULATE THE SIZE AND THE SECRETORY ACTIVITY OFTHE NOTOCHORD - A STUDY OF THE GOLGI-APPARATUS IN AVIAN EMBRYOS

Citation
Ah. Monsoroburq et al., ENVIRONMENTAL-FACTORS MODULATE THE SIZE AND THE SECRETORY ACTIVITY OFTHE NOTOCHORD - A STUDY OF THE GOLGI-APPARATUS IN AVIAN EMBRYOS, Comptes rendus de l'Academie des sciences. Serie 3, Sciences de la vie, 321(8), 1998, pp. 621-631
Citations number
36
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Biology,"Multidisciplinary Sciences
ISSN journal
0764-4469
Volume
321
Issue
8
Year of publication
1998
Pages
621 - 631
Database
ISI
SICI code
0764-4469(1998)321:8<621:EMTSAT>2.0.ZU;2-S
Abstract
In this study we examined the Golgi apparatus of avian notochord trans plants excised from 2-day-old (E2) chick embryos and grafted isochroni cally into a chick host either in a medial-ventral position, next to t he host notochord, or in a superficial position under the ectoderm lat erally or dorsally to the neural tube. The operated embryos were exami ned from E2 to E8. The diameters, the cytoplasmic vacuolization and th e immunostained Golgi apparatus were identical between the endogenous and ventrally grafted notochords, as well as between host-and superfic ially transplanted notochords when observed at E2. In contrast, from E 4 to E8, the size of the notochords grafted dorsally or laterally to t he neural tube was significantly smaller than the host, while the cyto plasmic vacuolization and the degree of fragmentation of the Golgi app aratus were significantly less than in the host notochords. These resu lts show that environmental and position-specific factors influence th e developmental program and the secretory activity of the notochordal cells. ((C) Academie des sciences/Elsevier, Paris.).