INVESTIGADORES
SANCHEZ Sara Serafina Del V.
artículos
Título:
Comparative study of vitellogenesis in the anuran amphibians Ceratophrys cranwelli (Leptodactilidae) and Bufo arenarum (Bufonidae).
Autor/es:
VILLECCO E.I.; AYBAR M.J.; SANCHEZ RIERA A.; SANCHEZ S.S.
Revista:
ZYGOTE
Editorial:
CAMBRIDGE UNIV PRESS
Referencias:
Año: 1999 vol. 7 p. 11 - 19
ISSN:
0967-1994
Resumen:
The present study analyses, by transmission electron
microscopy, vitellogenesis in two anuran amphibian families: Leptodactilidae
(Ceratophrys cranwelli) and Bufonidae (Bufo arenarum). These differ in the type
of stimulus that sets off their reproductive period, pluvial changes being the
trigger in C. cranwelli and temperature increase in B. arenarum. We found that
vitellogenesis follows an endocytic pathway that involves membranous structures
(coated pits, coated vesicles, endosomes and multivesicular bodies). This
process results in a fully grown yolk platelet of similar structure in both
species. Despite the above similarity, a distinctive feature in B. arenarum was
that the multivesicular bodies exhibited condensed proteins together with lipid
droplets, the latter remaining as such even in the primordial yolk platelet. In
C. cranwelli, however, lipids droplets were only found attached to the
primordial yolk platelet. The coexistence of lipid droplets together with
proteins in the nascent precursor yolk platelets observed in B. arenarum is
similar to that found in B. marinus. This fact might constitute a
characteristic feature of the Bufonidae family