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Juvenile hormone controls previtellogenic proliferation of ribosomal RNA in the mosquito fat body.

Abstract：

:During the previtellogenic development of mosquito fat body cells, the nucleolus, the organelle responsible for producing ribosomes, enlarges threefold, reaching maximal size between 2 and 3 days after eclosion. The granular component of the nucleolus containing ribosomal precursors increases considerably as well. These signs of nucleolar activation correlate with the synthetic rate and accumulation of poly(A)- RNA (predominantly ribosomal RNA) in the fat body cells. The amount of poly(A)- RNA in fat body cells increases during the first 2 days after eclosion and then declines gradually. The rate of RNA synthesis exhibits similar kinetics, but both the rise and the decline are sharper than for the accumulation of RNA. All the characteristics of nucleolar activation, its enlargement, accumulation of poly(A)- RNA, and the increased rate of RNA synthesis, are blocked by removal of the corpora allata (CA) in newly eclosed adult females but could be restored by either implantation of CA or topical application of juvenile hormone III or its analog, 7-S-methoprene, to allatectomized females. Thus, previtellogenic activation of fat body nucleoli for ribosomal RNA production is controlled by juvenile hormone from the corpora allata.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Raikhel AS,Lea AO

doi

10.1016/0016-6480(90)90233-c

subject

Has Abstract

pub_date

1990-03-01 00:00:00

pages

423-34

issue

3

eissn

0016-6480

issn

1095-6840

journal_volume

77

pub_type

杂志文章

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