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Open Biol. 2016 Nov;6(11). pii: 160152.

Systemic corazonin signalling modulates stress responses and metabolism in Drosophila.

Author information

1
Department of Zoology, Stockholm University, 10691 Stockholm, Sweden.
2
Department of Zoology, Stockholm University, 10691 Stockholm, Sweden dnassel@zoologi.su.se.

Abstract

Stress triggers cellular and systemic reactions in organisms to restore homeostasis. For instance, metabolic stress, experienced during starvation, elicits a hormonal response that reallocates resources to enable food search and readjustment of physiology. Mammalian gonadotropin-releasing hormone (GnRH) and its insect orthologue, adipokinetic hormone (AKH), are known for their roles in modulating stress-related behaviour. Here we show that corazonin (Crz), a peptide homologous to AKH/GnRH, also alters stress physiology in Drosophila The Crz receptor (CrzR) is expressed in salivary glands and adipocytes of the liver-like fat body, and CrzR knockdown targeted simultaneously to both these tissues increases the fly's resistance to starvation, desiccation and oxidative stress, reduces feeding, alters expression of transcripts of Drosophila insulin-like peptides (DILPs), and affects gene expression in the fat body. Furthermore, in starved flies, CrzR-knockdown increases circulating and stored carbohydrates. Thus, our findings indicate that elevated systemic Crz signalling during stress coordinates increased food intake and diminished energy stores to regain metabolic homeostasis. Our study suggests that an ancient stress-peptide in Urbilateria evolved to give rise to present-day GnRH, AKH and Crz signalling systems.

KEYWORDS:

corazonin receptor; fat body; insulin-like peptides; neuropeptide; stress signalling

PMID:
27810969
PMCID:
PMC5133436
DOI:
10.1098/rsob.160152
[Indexed for MEDLINE]
Free PMC Article

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