Distributed Circadian Rhythmicity In The Crustacean Nervous System

Aréchigá, Hugo; Rodrı́guez-Sosa, Leonardo

doi:10.1007/978-3-662-04843-6_8

Cited by 14 publications

(12 citation statements)

References 21 publications

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“…However, the identification of clock neurons satisfying criteria for autonomous pacemakers has not been easily forthcoming in any of the crustacean models investigated so far [17,76,77]. Daphnia and other cladoceran species have, as per many other planktonic organisms, developed escape strategies among which a light-entrained circadian behavior Pigment-dispersing hormone in Daphnia 3419 known as diel vertical migration (DVM) in the water body is probably the most important [78][79][80][81].…”

Section: Discussionmentioning

confidence: 99%

Pigment-dispersing hormone in Daphnia interneurons, one type homologous to insect clock neurons displaying circadian rhythmicity

Strauß

Zhang

Verleyen

et al. 2011

Cell. Mol. Life Sci.

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We report identification of a beta-type pigment-dispersing hormone (PDH) identical in two water flea species, Daphnia magna and Daphnia pulex. It has been identified by cloning of precursors, chromatographic isolation from tissue extracts followed by immunoassays and de novo-mass spectrometric sequencing. The peptide is restricted to a complex system of distinct interneurons in the brain and visual ganglia, but does not occur in neurosecretory cells projecting to neurohemal organs as in decapod crustaceans. Thirteen neuron types individually identified and reconstructed by immunohistochemistry were almost identical in terms of positions and projection patterns in both species. Several neurons invade and form plexuses in visual ganglia and major brain neuropils including the central body. Five neuron types show contralateral pathways and form plexuses in the lateral, dorsal, or postlateral brain neuropils. Others are local interneurons, and a tritocerebral neuron connects the protocerebrum with the neuropil of the locomotory second antenna. Two visual ganglia neuron types lateral to the medulla closely resemble insect medulla lateral circadian clock neurons containing pigment-dispersing factor based upon positional and projectional criteria. Experiments under 12:12 h light/dark cycles and constant light or darkness conditions showed significant circadian changes in numbers and activities of one type of medulla lateral PDH neuron with an acrophase in the evening. This simple PDH system shows striking homologies to PDH systems in decapod crustaceans and well-known clock neurons in several insects, which suggests evolutionary conservation of an ancient peptidergic interneuronal system that is part of biological clocks.

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Section: Discussionmentioning

confidence: 99%

Pigment-dispersing hormone in Daphnia interneurons, one type homologous to insect clock neurons displaying circadian rhythmicity

Strauß

Zhang

Verleyen

et al. 2011

Cell. Mol. Life Sci.

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“…In crayfish submitted to constant darkness, the previously mentioned circadian rhythms persist, but retinal sensitivity increases, and an increment in time‐of‐activity (alpha) takes place (30,31). Thus, we could expect an increase under this condition of pro‐oxidant reactions linked with metabolism and consequently ROS formation.…”

Section: Discussionmentioning

confidence: 99%

Crayfish Procambarus clarkii Retina and Nervous System Exhibit Antioxidant Circadian Rhythms Coupled with Metabolic and Luminous Daily Cycles

Fanjul‐Moles

Prieto-Sagredo

López

et al. 2009

Photochem & Photobiology

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Based on previous work in which we proposed midgut as a putative peripheral oscillator responsible for circadian reduced glutathione (GSH) crayfish status, herein we investigated the retina and optic lobe-brain (OL-B) circadian GSH system and its ability to deal with reactive oxygen species (ROS) produced as a consequence of metabolic rhythms and light variations. We characterized daily and antioxidant circadian variations of the different parameters of the glutathione system, including GSH, oxidized glutathione (GSSG), glutathione reductase (GR) and glutathione peroxidase (GPx), as well as metabolic and lipoperoxidative circadian oscillations in retina and OL-B, determining internal and external GSH-system synchrony. The results demonstrate statistically significant bi- and unimodal daily and circadian rhythms in all GSH-cycle parameters, substrates and enzymes in OL-B and retina, as well as an apparent direct effect of light on these rhythms, especially in the retina. The luminous condition appears to stimulate the GSH system to antagonize ROS and lipid peroxidation (LPO) daily and circadian rhythms occurring in both structures, oscillating with higher LPO under dark conditions. We suggest that the difference in the effect of light on GSH rhythmic mechanisms of both structures for antagonizing ROS could be due to differences in glutathione-system coupling strength with the circadian clock.

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“…Several crustacean clocks have previously been reviewed with regard to both circadian (10,(19)(20)(21)(22) and circatidal (3,4,6,8,19) rhythms, just to mention only some more recent or extensive works. Whilst ultradian rhythms have been detected in many systems (12), their functional significance has yet to be determined.…”

Section: Chronobiological Systems In Crustaceamentioning

confidence: 99%

“…the lamina ganglionaris, the medulla externa, the medulla interna (= lobula), and finally the medulla terminalis, which is in fact part of the lateral protocerebrum of the brain (123)(124)(125). The eyestalk proved to be an important source of neuropeptides and small modulators such as serotonin and melatonin involved in circadian regulation, that affect rhythms of locomotion, pigment distribution, and eye sensitivity (10,20,21,95). Most of the neurosecretion within the eyestalk ganglia that is of relevance for circadian rhythmicity appears to be attributed to the well-established neurosecretory X-organ-sinus gland system (XOSG) (126) (e.g.…”

Section: Eyestalk Systems and Mediators Of Circadian Rhythmicitymentioning

confidence: 99%

Circadian clocks in crustaceans: identified neuronal and cellular systems

Strauß

Dircksen²

2010

Front Biosci

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Circadian rhythms are known for locomotory and reproductive behaviours, and the functioning of sensory organs, nervous structures, metabolism and developmental processes. The mechanisms and cellular bases of control are mainly inferred from circadian phenomenologies, ablation experiments and pharmacological approaches. Cellular systems for regulation summarised here comprise the retina, the eyestalk neuroendocrine X-organ-sinus gland system, several neuropeptides such as red pigment concentrating, hyperglycaemic and pigment-dispersing hormones, and factors such as serotonin and melatonin. No master clock has been identified, but a model of distributed clockwork involves oscillators such as the retinular cells, neurosecretory systems in the optic lobes, putative brain pacemakers, and the caudal photoreceptor. Extraretinal brain photoreceptors mediate entrainment. Comparative analyses of clock neurons and proteins known from insects may allow the identification of candidate clock neurons in crustaceans as putative homologues in the two taxa. Evidence for the existence of "insect-like" intracellular clock proteins and (light sensitive) transcription factors is scarce, but clock-, period-, and cryptochrome-gene products have been localised in the CNS and other organs rendering further investigations into crustacean clockwork very promising.

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Distributed Circadian Rhythmicity In The Crustacean Nervous System

Cited by 14 publications

References 21 publications

Pigment-dispersing hormone in Daphnia interneurons, one type homologous to insect clock neurons displaying circadian rhythmicity

Pigment-dispersing hormone in Daphnia interneurons, one type homologous to insect clock neurons displaying circadian rhythmicity

Crayfish Procambarus clarkii Retina and Nervous System Exhibit Antioxidant Circadian Rhythms Coupled with Metabolic and Luminous Daily Cycles

Circadian clocks in crustaceans: identified neuronal and cellular systems

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