Fat Body Involvement in the Plasma Vitellogenin Changes During Recovery Phase in Rana esculenta(Reproductive Biology)

概要

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The role of fat body in the reproductive physiology of Rana esculenta was investigated during recovery phase. Changes in the ovarian weight, plasma vitellogenin (VTG) and estradiol-17β Levels were analyzed in intact frogs, in those without fat bodies (FBD) and in males and females injected with estradiol-17β. The ovarian weight decreased by day 28 in intact females but not in FBD animals. At the same time plasma VTG liters sharply decreased on day 21 in intact animals, but no significant changes were found in FBD females. Male frogs never synthetize VTG; they do so, however, after injection of estradiol-17β, FBD males showed higher VTG liters than intacl males. The resulls oblained in vitro showed a sharp decrease of vitellogenin added in the medium of cultured fat body. Thus, Ihe in vivo and in vitro results allow us to suggest thai fal bodies melabolize plasma vitellogenin, at least during recovery phase; Iherefore ovarian growlh may depend on an interplay among hepalic vitellogenin synthesis, fat body melabolic activity and ovarian uplake.
社団法人日本動物学会の論文
1991-10-15