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Modulation of larval nutrition affects midgut neutral lipid storage and temporal pattern of transcription factor expression during mosquito metamorphosis.

Abstract：

:During holometabolous insect development the critical weight marks a physiological transition after which juvenile hormone (JH) concentration decreases to such a level that a subsequent increase in ecdysone titer will initiate metamorphosis. Starvation experiments indicate that the Aedes aegypti critical weight is achieved by 24 h after the last larval-larval molt. When grown at 24 degrees C with excess food, the time between the critical weight and maximum weight (interval to cessation of growth) is about 24 h and pupation occurs about 24 h after the maximum weight is achieved. Oil Red O staining of 3rd and early 4th instars indicates that the midgut is a neutral lipid storage organ during this period. Coincident with the attainment of the critical weight is the depletion of stored midgut neutral lipid. Application of methoprene to 24 h post-molt 4th instars results in renewed midgut storage of neutral lipid suggesting that midgut neutral lipid storage is a JH dependent process. Starvation of 4th instars during the 24 h post-molt period suspends development in a fraction of the larvae, and with the resumption of feeding, development resumes. A regimen of starvation and resumption of feeding of 4th instars suggests that JH concentration decreased over a 40 h period after the resumption of feeding and maximum weight is attained about 48 h after the resumption of feeding. We hypothesize that this results in a shortening of the interval to cessation of growth. Real-time PCR experiments indicate that shortening the interval to cessation of growth compresses the time period during which increases in AHR3, AaEcR-B and AaUSP-a expression occur.

journal_name

J Insect Physiol

journal_title

Journal of insect physiology

authors

Nishiura JT,Burgos C,Aya S,Goryacheva Y,Lo W

doi

10.1016/j.jinsphys.2006.09.014

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

47-58

issue

1

eissn

0022-1910

issn

1879-1611

pii

S0022-1910(06)00170-3

journal_volume

53

pub_type

杂志文章

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