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Lopez-Bellido, R., Himmel, N.J., Gutstein, H.B., Cox, D.N., Galko, M.J. (2019). An assay for chemical nociception in Drosophila larvae.  Philos. Trans. R. Soc. Lond. B. Biol. Sci. 374(1785): 20190282.
FlyBase ID
FBrf0243528
Publication Type
Research paper
Abstract

Chemically induced nociception has not yet been studied intensively in genetically tractable models. Hence, our goal was to establish a Drosophila assay that can be used to study the cellular and molecular/genetic bases of chemically induced nociception. Drosophila larvae exposed to increasing concentrations of hydrochloric acid (HCl) produced an increasingly intense aversive rolling response. HCl (0.5%) was subthreshold and provoked no response. All classes of peripheral multidendritic (md) sensory neurons (classes I-IV) are required for full responsiveness to acid, with class IV making the largest contribution. At the cellular level, classes IV, III and I showed increases in calcium following acid exposure. In the central nervous system, Basin-4 second-order neurons are the key regulators of chemically induced nociception, with a slight contribution from other types. Finally, chemical nociception can be sensitized by tissue damage. Subthreshold HCl provoked chemical allodynia in larvae 4 h after physical puncture wounding. Pinch wounding and UV irradiation, which do not compromise the cuticle, did not cause chemical allodynia. In sum, we developed a novel assay to study chemically induced nociception in Drosophila larvae. This assay, combined with the high genetic resolving power of Drosophila, should improve our basic understanding of fundamental mechanisms of chemical nociception. This article is part of the Theo Murphy meeting issue 'Evolution of mechanisms and behaviour important for pain'.

PubMed ID
PubMed Central ID
PMC6790381 (PMC) (EuropePMC)
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    Language of Publication
    English
    Additional Languages of Abstract
    Parent Publication
    Publication Type
    Journal
    Abbreviation
    Philos. Trans. R. Soc. Lond. B. Biol. Sci.
    Title
    Philosophical transactions of the Royal Society of London. Series B, Biological sciences
    Publication Year
    1887-
    ISBN/ISSN
    0962-8436 1471-2970
    Data From Reference