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2014 ; 28
(23
): 2636-51
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Production of systemically circulating Hedgehog by the intestine couples
nutrition to growth and development
#MMPMID25452274
Rodenfels J
; Lavrynenko O
; Ayciriex S
; Sampaio JL
; Carvalho M
; Shevchenko A
; Eaton S
Genes Dev
2014[Dec]; 28
(23
): 2636-51
PMID25452274
show ga
In Drosophila larvae, growth and developmental timing are regulated by nutrition
in a tightly coordinated fashion. The networks that couple these processes are
far from understood. Here, we show that the intestine responds to nutrient
availability by regulating production of a circulating lipoprotein-associated
form of the signaling protein Hedgehog (Hh). Levels of circulating Hh tune the
rates of growth and developmental timing in a coordinated fashion. Circulating Hh
signals to the fat body to control larval growth. It regulates developmental
timing by controlling ecdysteroid production in the prothoracic gland.
Circulating Hh is especially important during starvation, when it is also
required for mobilization of fat body triacylglycerol (TAG) stores. Thus, we
demonstrate that Hh, previously known only for its local morphogenetic functions,
also acts as a lipoprotein-associated endocrine hormone, coordinating the
response of multiple tissues to nutrient availability.