Elucidation of a profile of scallop vitellin formation associated with oogenesis and its endocrine control, and identification of a vitellogenin synthesizing site were immunologically undertaken by using anti-scallop Vn serum. Vn content increased during ovarian growth and accounted for more than 80% of the watersoluble protein of the ovary at the mature stage. In vivo injection of estradiol-17β (E2) resulted in an increase in Vn content in the ovary. In vitro accumulation of Vn in the ovarian tissue was promoted with E2 and a vitellogenesis promoting factor (VPF) from cerebral plus pedal ganglion which was heat stable, less than MW 10,000 and trypsin/ chymotrypsin resistant. Estrogen receptor (ER)-like immunoreactivity was found in the growing oocyte and the auxiliary cell in close contact with growing oocytes, in which Vn immunoreactivity was also found. It is suggested that the vitellogenin synthesis occurred inside the ovary, especially in the auxiliary cell, and is controled by E2 and VPF via ER.
|Number of pages||8|
|Journal||Journal of Experimental Zoology Part A: Comparative Experimental Biology|
|Publication status||Published - 2003 Oct 1|
ASJC Scopus subject areas
- Animal Science and Zoology