Constant illumination reduces circulating melatonin and impairs immune function in the cricket Teleogryllus commodus

PeerJ
Joanna DurrantTherésa M Jones

Abstract

Exposure to constant light has a range of negative effects on behaviour and physiology, including reduced immune function in both vertebrates and invertebrates. It is proposed that the associated suppression of melatonin (a ubiquitous hormone and powerful antioxidant) in response to the presence of light at night could be an underlying mechanistic link driving the changes to immune function. Here, we investigated the relationship between constant illumination, melatonin and immune function, using a model invertebrate species, the Australian black field cricket, Teleogryllus commodus. Crickets were reared under either a 12 h light: 12 h dark regimen or a constant 24 h light regimen. Circulating melatonin concentration and immune function (haemocyte concentration, lytic activity and phenoloxidase (PO) activity) were assessed in individual adult crickets through the analysis of haemolymph. Constant illumination reduced melatonin and had a negative impact on haemocyte concentrations and lytic activity, but its effect on PO activity was less apparent. Our data provide the first evidence, to our knowledge, of a link between exposure to constant illumination and variation in haemocyte concentration in an invertebrate model, while also...Continue Reading

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Citations

May 16, 2018·Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology·Roy H A van GrunsvenFranz Hölker
Jun 5, 2018·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Joanna DurrantTherésa M Jones
Oct 17, 2018·PeerJ·Nikolas J WillmottTherésa M Jones
Mar 18, 2020·Environmental Pollution·Franziska KuppratWerner Kloas
Jan 23, 2021·Journal of Insect Physiology·Lydia R FyieMegan E Meuti
Nov 4, 2021·Seminars in Immunopathology·William H WalkerRandy J Nelson

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