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Mat A, Vu HH, Wolf E, Tessmar-Raible K. All Light, Everywhere? Photoreceptors at Nonconventional Sites. Physiology (Bethesda) 2024; 39:0. [PMID: 37905983 DOI: 10.1152/physiol.00017.2023] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 10/29/2023] [Accepted: 10/29/2023] [Indexed: 11/02/2023] Open
Abstract
One of the biggest environmental alterations we have made to our species is the change in the exposure to light. During the day, we typically sit behind glass windows illuminated by artificial light that is >400 times dimmer and has a very different spectrum than natural daylight. On the opposite end are the nights that are now lit up by several orders of magnitude. This review aims to provide food for thought as to why this matters for humans and other animals. Evidence from behavioral neuroscience, physiology, chronobiology, and molecular biology is increasingly converging on the conclusions that the biological nonvisual functions of light and photosensory molecules are highly complex. The initial work of von Frisch on extraocular photoreceptors in fish, the identification of rhodopsins as the molecular light receptors in animal eyes and eye-like structures and cryptochromes as light sensors in nonmammalian chronobiology, still allowed for the impression that light reception would be a relatively restricted, localized sense in most animals. However, light-sensitive processes and/or sensory proteins have now been localized to many different cell types and tissues. It might be necessary to consider nonlight-responding cells as the exception, rather than the rule.
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Affiliation(s)
- Audrey Mat
- Max Perutz Labs, University of Vienna, Vienna BioCenter, Vienna, Austria
- VIPS2, Vienna BioCenter, Vienna, Austria
| | - Hong Ha Vu
- Institute of Molecular Physiology, Johannes Gutenberg-University, Mainz, Germany
| | - Eva Wolf
- Institute of Molecular Physiology, Johannes Gutenberg-University, Mainz, Germany
- Institute of Molecular Biology, Mainz, Germany
| | - Kristin Tessmar-Raible
- Max Perutz Labs, University of Vienna, Vienna BioCenter, Vienna, Austria
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
- Carl-von-Ossietzky University, Oldenburg, Germany
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2
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Dao P, Hajny S, Mekis R, Orel L, Dinhopl N, Tessmar-Raible K, Nowikovsky K. The cation exchanger Letm1, circadian rhythms, and NAD(H) levels interconnect in diurnal zebrafish. Life Sci Alliance 2022; 5:e202101194. [PMID: 35697381 PMCID: PMC9191620 DOI: 10.26508/lsa.202101194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2021] [Revised: 04/20/2022] [Accepted: 04/21/2022] [Indexed: 11/24/2022] Open
Abstract
Mitochondria are fundamental for life and require balanced ion exchange to maintain proper functioning. The mitochondrial cation exchanger LETM1 sparks interest because of its pathophysiological role in seizures in the Wolf Hirschhorn Syndrome (WHS). Despite observation of sleep disorganization in epileptic WHS patients, and growing studies linking mitochondria and epilepsy to circadian rhythms, LETM1 has not been studied from the chronobiological perspective. Here we established a viable letm1 knock-out, using the diurnal vertebrate Danio rerio to study the metabolic and chronobiological consequences of letm1 deficiency. We report diurnal rhythms of Letm1 protein levels in wild-type fish. We show that mitochondrial nucleotide metabolism is deregulated in letm1-/- mutant fish, the rate-limiting enzyme of NAD+ production is up-regulated, while NAD+ and NADH pools are reduced. These changes were associated with increased expression amplitude of circadian core clock genes in letm1-/- compared with wild-type under light/dark conditions, suggesting decreased NAD(H) levels as a possible mechanism for circadian system perturbation in Letm1 deficiency. Replenishing NAD pool may ameliorate WHS-associated sleep and neurological disorders.
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Affiliation(s)
- Pauline Dao
- Max F Perutz Laboratories, Research Platform Rhythms of Life, University of Vienna, Vienna, Austria
- Department of Internal Medicine I, Medical University Vienna, Vienna, Austria
- Department of Biomedical Sciences, Unit of Physiology and Biophysics, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Stefan Hajny
- Max F Perutz Laboratories, Research Platform Rhythms of Life, University of Vienna, Vienna, Austria
- Department of Internal Medicine I, Medical University Vienna, Vienna, Austria
| | - Ronald Mekis
- Department of Internal Medicine I, Medical University Vienna, Vienna, Austria
- Department of Biomedical Sciences, Unit of Physiology and Biophysics, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Lukas Orel
- Max F Perutz Laboratories, Research Platform Rhythms of Life, University of Vienna, Vienna, Austria
| | - Nora Dinhopl
- Department of Pathobiology, Institute of Pathology, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Kristin Tessmar-Raible
- Max F Perutz Laboratories, Research Platform Rhythms of Life, University of Vienna, Vienna, Austria
| | - Karin Nowikovsky
- Department of Internal Medicine I, Medical University Vienna, Vienna, Austria
- Department of Biomedical Sciences, Unit of Physiology and Biophysics, University of Veterinary Medicine Vienna, Vienna, Austria
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Two light sensors decode moonlight versus sunlight to adjust a plastic circadian/circalunidian clock to moon phase. Proc Natl Acad Sci U S A 2022; 119:e2115725119. [PMID: 35622889 PMCID: PMC9295771 DOI: 10.1073/pnas.2115725119] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The moon provides highly reliable time information to organisms. Whereas sunlight is known to set daily animal timing systems, mechanistic insight into the impact of moonlight on such systems remains scarce. We establish that the marine bristleworm Platynereis dumerilii times the precise hours of mass spawning by integrating lunar light information into a plastic daily timing system able to run with circadian (∼24 h) or circalunidian (∼24.8 h) periodicity. The correct interpretation of moonlight is mediated by the interplay of two light sensors: a cryptochrome and a melanopsin ortholog provide information on light valence and moonrise time, respectively. Besides its ecological relevance, our work provides a plausible explanation for long-standing observations of light intensity–dependent differences in circadian clock periods. Many species synchronize their physiology and behavior to specific hours. It is commonly assumed that sunlight acts as the main entrainment signal for ∼24-h clocks. However, the moon provides similarly regular time information. Consistently, a growing number of studies have reported correlations between diel behavior and lunidian cycles. Yet, mechanistic insight into the possible influences of the moon on ∼24-h timers remains scarce. We have explored the marine bristleworm Platynereis dumerilii to investigate the role of moonlight in the timing of daily behavior. We uncover that moonlight, besides its role in monthly timing, also schedules the exact hour of nocturnal swarming onset to the nights’ darkest times. Our work reveals that extended moonlight impacts on a plastic clock that exhibits <24 h (moonlit) or >24 h (no moon) periodicity. Abundance, light sensitivity, and genetic requirement indicate that the Platynereis light receptor molecule r-Opsin1 serves as a receptor that senses moonrise, whereas the cryptochrome protein L-Cry is required to discriminate the proper valence of nocturnal light as either moonlight or sunlight. Comparative experiments in Drosophila suggest that cryptochrome’s principle requirement for light valence interpretation is conserved. Its exact biochemical properties differ, however, between species with dissimilar timing ecology. Our work advances the molecular understanding of lunar impact on fundamental rhythmic processes, including those of marine mass spawners endangered by anthropogenic change.
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Dekens MPS, Fontinha BM, Gallach M, Pflügler S, Tessmar‐Raible K. Melanopsin elevates locomotor activity during the wake state of the diurnal zebrafish. EMBO Rep 2022; 23:e51528. [PMID: 35233929 PMCID: PMC9066073 DOI: 10.15252/embr.202051528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Revised: 01/24/2022] [Accepted: 02/04/2022] [Indexed: 11/28/2022] Open
Abstract
Mammalian and fish pineals play a key role in adapting behaviour to the ambient light conditions through the release of melatonin. In mice, light inhibits nocturnal locomotor activity via the non‐visual photoreceptor Melanopsin. In contrast to the extensively studied function of Melanopsin in the indirect regulation of the rodent pineal, its role in the intrinsically photosensitive zebrafish pineal has not been elucidated. Therefore, it is not evident if the light signalling mechanism is conserved between distant vertebrates, and how Melanopsin could affect diurnal behaviour. A double knockout of melanopsins (opn4.1‐opn4xb) was generated in the diurnal zebrafish, which manifests attenuated locomotor activity during the wake state. Transcriptome sequencing gave insight into pathways downstream of Melanopsin, implying that sustained repression of the melatonin pathway is required to elevate locomotor activity during the diurnal wake state. Moreover, we show that light induces locomotor activity during the diurnal wake state in an intensity‐dependent manner. These observations suggest a common Melanopsin‐driven mechanism between zebrafish and mammals, while the diurnal and nocturnal chronotypes are inversely regulated downstream of melatonin.
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Affiliation(s)
- Marcus P S Dekens
- Max Perutz Laboratory Centre for Molecular Biology University of Vienna and Medical University of Vienna Vienna Austria
| | - Bruno M Fontinha
- Max Perutz Laboratory Centre for Molecular Biology University of Vienna and Medical University of Vienna Vienna Austria
| | - Miguel Gallach
- Max Perutz Laboratory Centre for Molecular Biology University of Vienna and Medical University of Vienna Vienna Austria
- Max Perutz Laboratory Centre for Integrative Bioinformatics University of Vienna and Medical University of Vienna Vienna Austria
| | - Sandra Pflügler
- Max Perutz Laboratory Centre for Molecular Biology University of Vienna and Medical University of Vienna Vienna Austria
| | - Kristin Tessmar‐Raible
- Max Perutz Laboratory Centre for Molecular Biology University of Vienna and Medical University of Vienna Vienna Austria
- Research Platform “Marine Rhythms of Life” University of Vienna Vienna Austria
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Schalm G, Bruns K, Drachenberg N, Geyer N, Foulkes NS, Bertolucci C, Gerlach G. Finding Nemo's clock reveals switch from nocturnal to diurnal activity. Sci Rep 2021; 11:6801. [PMID: 33762724 PMCID: PMC7990958 DOI: 10.1038/s41598-021-86244-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 03/12/2021] [Indexed: 11/08/2022] Open
Abstract
Timing mechanisms play a key role in the biology of coral reef fish. Typically, fish larvae leave their reef after hatching, stay for a period in the open ocean before returning to the reef for settlement. During this dispersal, larvae use a time-compensated sun compass for orientation. However, the timing of settlement and how coral reef fish keep track of time via endogenous timing mechanisms is poorly understood. Here, we have studied the behavioural and genetic basis of diel rhythms in the clown anemonefish Amphiprion ocellaris. We document a behavioural shift from nocturnal larvae to diurnal adults, while juveniles show an intermediate pattern of activity which potentially indicates flexibility in the timing of settlement on a host anemone. qRTPCR analysis of six core circadian clock genes (bmal1, clocka, cry1b, per1b, per2, per3) reveals rhythmic gene expression patterns that are comparable in larvae and juveniles, and so do not reflect the corresponding activity changes. By establishing an embryonic cell line, we demonstrate that clown anemonefish possess an endogenous clock with similar properties to that of the zebrafish circadian clock. Furthermore, our study provides a first basis to study the multi-layered interaction of clocks from fish, anemones and their zooxanthellae endosymbionts.
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Affiliation(s)
- Gregor Schalm
- Institute of Biology and Environmental Sciences, Carl von Ossietzky University Oldenburg, Ammerländer Heerstr. 114-118, 26129, Oldenburg, Germany.
| | - Kristina Bruns
- Institute of Biology and Environmental Sciences, Carl von Ossietzky University Oldenburg, Ammerländer Heerstr. 114-118, 26129, Oldenburg, Germany
| | - Nina Drachenberg
- Institute of Biology and Environmental Sciences, Carl von Ossietzky University Oldenburg, Ammerländer Heerstr. 114-118, 26129, Oldenburg, Germany
| | - Nathalie Geyer
- Institute of Biological and Chemical Systems (IBCS), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Nicholas S Foulkes
- Institute of Biological and Chemical Systems (IBCS), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Cristiano Bertolucci
- Department of Life Sciences and Biotechnology, University of Ferrara, Via Luigi Borsari 46, 44121, Ferrara, Italy
- Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn Napoli, Villa Comunale, 80121, Naples, Italy
| | - Gabriele Gerlach
- Institute of Biology and Environmental Sciences, Carl von Ossietzky University Oldenburg, Ammerländer Heerstr. 114-118, 26129, Oldenburg, Germany
- Helmholtz Institute for Functional Marine Biodiversity (HIFMB), Ammerländer Heerstr. 231, 26129, Oldenburg, Germany
- Centre of Excellence for Coral Reef Studies and School of Marine and Tropical Biology, James Cook University, Townsville, QLD, 4811, Australia
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Seasonal variation in UVA light drives hormonal and behavioural changes in a marine annelid via a ciliary opsin. Nat Ecol Evol 2021; 5:204-218. [PMID: 33432133 PMCID: PMC7611595 DOI: 10.1038/s41559-020-01356-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Accepted: 10/22/2020] [Indexed: 02/08/2023]
Abstract
The right timing of animal physiology and behaviour ensures the stability of populations and ecosystems. To predict anthropogenic impacts on these timings, more insight is needed into the interplay between environment and molecular timing mechanisms. This is particularly true in marine environments. Using high-resolution, long-term daylight measurements from a habitat of the marine annelid Platynereis dumerilii, we found that temporal changes in ultraviolet A (UVA)/deep violet intensities, more than longer wavelengths, can provide annual time information, which differs from annual changes in the photoperiod. We developed experimental set-ups that resemble natural daylight illumination conditions, and automated, quantifiable behavioural tracking. Experimental reduction of UVA/deep violet light (approximately 370-430 nm) under a long photoperiod (16 h light and 8 h dark) significantly decreased locomotor activities, comparable to the decrease caused by a short photoperiod (8 h light and 16 h dark). In contrast, altering UVA/deep violet light intensities did not cause differences in locomotor levels under a short photoperiod. This modulation of locomotion by UVA/deep violet light under a long photoperiod requires c-opsin1, a UVA/deep violet sensor employing Gi signalling. C-opsin1 also regulates the levels of rate-limiting enzymes for monogenic amine synthesis and of several neurohormones, including pigment-dispersing factor, vasotocin (vasopressin/oxytocin) and neuropeptide Y. Our analyses indicate a complex inteplay between UVA/deep violet light intensities and photoperiod as indicators of annual time.
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Krylov VV, Izvekov EI, Pavlova VV, Pankova NA, Osipova EA. Circadian rhythms in zebrafish (Danio rerio) behaviour and the sources of their variability. Biol Rev Camb Philos Soc 2020; 96:785-797. [PMID: 33331134 DOI: 10.1111/brv.12678] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 12/04/2020] [Accepted: 12/08/2020] [Indexed: 12/12/2022]
Abstract
Over recent decades, changes in zebrafish (Danio rerio) behaviour have become popular quantitative indicators in biomedical studies. The circadian rhythms of behavioural processes in zebrafish are known to enable effective utilization of energy and resources, therefore attracting interest in zebrafish as a research model. This review covers a variety of circadian behaviours in this species, including diurnal rhythms of spawning, feeding, locomotor activity, shoaling, light/dark preference, and vertical position preference. Changes in circadian activity during zebrafish ontogeny are reviewed, including ageing-related alterations and chemically induced variations in rhythmicity patterns. Both exogenous and endogenous sources of inter-individual variability in zebrafish circadian behaviour are detailed. Additionally, we focus on different environmental factors with the potential to entrain circadian processes in zebrafish. This review describes two principal ways whereby diurnal behavioural rhythms can be entrained: (i) modulation of organismal physiological state, which can have masking or enhancing effects on behavioural endpoints related to endogenous circadian rhythms, and (ii) modulation of period and amplitude of the endogenous circadian rhythm due to competitive relationships between the primary and secondary zeitgebers. In addition, different peripheral oscillators in zebrafish can be entrained by diverse zeitgebers. This complicated orchestra of divergent influences may cause variability in zebrafish circadian behaviours, which should be given attention when planning behavioural studies.
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Affiliation(s)
- Viacheslav V Krylov
- I.D. Papanin Institute for Biology of Inland Waters Russian Academy of Sciences, Borok, Nekouz, Yaroslavl Oblast, 152742, Russia
| | - Evgeny I Izvekov
- I.D. Papanin Institute for Biology of Inland Waters Russian Academy of Sciences, Borok, Nekouz, Yaroslavl Oblast, 152742, Russia
| | - Vera V Pavlova
- I.D. Papanin Institute for Biology of Inland Waters Russian Academy of Sciences, Borok, Nekouz, Yaroslavl Oblast, 152742, Russia
| | - Natalia A Pankova
- I.D. Papanin Institute for Biology of Inland Waters Russian Academy of Sciences, Borok, Nekouz, Yaroslavl Oblast, 152742, Russia
| | - Elena A Osipova
- I.D. Papanin Institute for Biology of Inland Waters Russian Academy of Sciences, Borok, Nekouz, Yaroslavl Oblast, 152742, Russia
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You MS, Yang WB, Cheng CH, Yu S, Chang HC, Yu HS. Red LED light treatment promotes cognitive learning through up-regulation of trpm4 in zebrafish. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2020; 213:112073. [PMID: 33186875 DOI: 10.1016/j.jphotobiol.2020.112073] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 10/20/2020] [Accepted: 10/26/2020] [Indexed: 01/21/2023]
Abstract
Although light emitting diodes (LEDs) are widely used in our daily lives, there is little research regarding LED light's possible effects on biological functions. We used a zebrafish animal model to investigate the long-term effects of white, blue and red LED lights on cognitive learning and memory recall. Our data suggest that these treatments had not only an impact on learning but also surprisingly long-lasting effects, particularly with regard to individuals treated with red light. The qPCR results revealed that the expression levels of trpm4, trpa1b, grin2aa and dlg4 in the skin were increased after monochromatic light treatment. Furthermore, the up-regulation of trpm4 in the brain may correlate to enhanced learning and memory following red-light treatment. Our results identify a light-based stimulation system for enhancing zebrafish learning, which has the potential to provide important insights into the relationship between LED lighting and animal behaviour.
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Affiliation(s)
- May-Su You
- Institute of Molecular and Genomic Medicine, National Health Research Institutes, Zhunan, Miaoli County 35053, Taiwan
| | - Wen-Bin Yang
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan; National Institute of Environmental Health Sciences, National Health Research Institutes, Zhunan, Miaoli County 35053, Taiwan
| | - Chao-Hung Cheng
- National Institute of Environmental Health Sciences, National Health Research Institutes, Zhunan, Miaoli County 35053, Taiwan
| | - Sebastian Yu
- Department of Dermatology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 80708, Taiwan; Graduate Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
| | - Han-Chao Chang
- Taiwan Instrument Reserach Institute, National Applied Research Laboratories, Hsinchu 30076, Taiwan
| | - Hsin-Su Yu
- National Institute of Environmental Health Sciences, National Health Research Institutes, Zhunan, Miaoli County 35053, Taiwan; Department of Dermatology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 80708, Taiwan; Graduate Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan.
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Brillatz T, Kubo M, Takahashi S, Jozukuri N, Takechi K, Queiroz EF, Marcourt L, Allard PM, Fish R, Harada K, Ishizawa K, Crawford AD, Fukuyama Y, Wolfender JL. Metabolite Profiling of Javanese Ginger Zingiber purpureum and Identification of Antiseizure Metabolites via a Low-Cost Open-Source Zebrafish Bioassay-Guided Isolation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:7904-7915. [PMID: 32628839 DOI: 10.1021/acs.jafc.0c02641] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The rhizomes of Zingiber purpureum, "Bangle", were investigated for its antiseizure properties using a streamlined and cost-effective zebrafish screening strategy and a mouse epilepsy assay. Its hexane extract demonstrated strong antiseizure activity in zebrafish epilepsy assay and was, therefore, selected for bioactivity-guided fractionation. Twelve compounds (1-12) were isolated, and two bioactive phenylbutenoids, trans- (11) and cis-banglene (12), reduced up to 70% of pentylenetetrazole (PTZ)-induced seizures. These compounds showed moderate activity against PTZ-induced seizures in a mouse epilepsy assay. To understand the specificity of Z. purpureum active compounds, its chemical profile was compared to that of Z. officinale. Their composition was assessed by differential metabolite profiling visualized by a molecular network, which revealed only vanillin derivatives and terpenoids as common metabolites and gave a comprehensive view of Z. purpureum composition. This study demonstrates the efficacy of a streamlined zebrafish epilepsy assay, which is therefore suitable for routine screening in phytochemistry laboratories.
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Affiliation(s)
- Théo Brillatz
- School of Pharmaceutical Sciences, University of Geneva, Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU-Rue Michel-Servet 1, CH-1211 Geneva 4, Switzerland
| | - Miwa Kubo
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima, Japan
| | - Shimon Takahashi
- Department of Clinical Pharmacology and Therapeutics, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Natsumi Jozukuri
- Department of Clinical Pharmacology and Therapeutics, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | | | - Emerson Ferreira Queiroz
- School of Pharmaceutical Sciences, University of Geneva, Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU-Rue Michel-Servet 1, CH-1211 Geneva 4, Switzerland
| | - Laurence Marcourt
- School of Pharmaceutical Sciences, University of Geneva, Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU-Rue Michel-Servet 1, CH-1211 Geneva 4, Switzerland
| | - Pierre-Marie Allard
- School of Pharmaceutical Sciences, University of Geneva, Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU-Rue Michel-Servet 1, CH-1211 Geneva 4, Switzerland
| | - Richard Fish
- Department of Genetic Medicine and Development, University of Geneva, Faculty of Medicine, CMU-Rue Michel-Servet 1, CH-1211 Geneva 4, Switzerland
| | - Kenichi Harada
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima, Japan
| | - Keisuke Ishizawa
- Department of Clinical Pharmacology and Therapeutics, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Alexander D Crawford
- Department of Preclinical Sciences & Pathology, Norwegian University of Life Sciences, Ulleva°lsveien 72, 0454 Oslo, Norway
| | - Yoshiyasu Fukuyama
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima, Japan
| | - Jean-Luc Wolfender
- School of Pharmaceutical Sciences, University of Geneva, Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU-Rue Michel-Servet 1, CH-1211 Geneva 4, Switzerland
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10
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Ayers T, Tsukamoto H, Gühmann M, Veedin Rajan VB, Tessmar-Raible K. A G o-type opsin mediates the shadow reflex in the annelid Platynereis dumerilii. BMC Biol 2018; 16:41. [PMID: 29669554 PMCID: PMC5904973 DOI: 10.1186/s12915-018-0505-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Accepted: 03/12/2018] [Indexed: 12/04/2022] Open
Abstract
BACKGROUND The presence of photoreceptive molecules outside the eye is widespread among animals, yet their functions in the periphery are less well understood. Marine organisms, such as annelid worms, exhibit a 'shadow reflex', a defensive withdrawal behaviour triggered by a decrease in illumination. Herein, we examine the cellular and molecular underpinnings of this response, identifying a role for a photoreceptor molecule of the Go-opsin class in the shadow response of the marine bristle worm Platynereis dumerilii. RESULTS We found Pdu-Go-opsin1 expression in single specialised cells located in adult Platynereis head and trunk appendages, known as cirri. Using gene knock-out technology and ablation approaches, we show that the presence of Go-opsin1 and the cirri is necessary for the shadow reflex. Consistently, quantification of the shadow reflex reveals a chromatic dependence upon light of approximately 500 nm in wavelength, matching the photoexcitation characteristics of the Platynereis Go-opsin1. However, the loss of Go-opsin1 does not abolish the shadow reflex completely, suggesting the existence of a compensatory mechanism, possibly acting through a ciliary-type opsin, Pdu-c-opsin2, with a Lambdamax of approximately 490 nm. CONCLUSIONS We show that a Go-opsin is necessary for the shadow reflex in a marine annelid, describing a functional example for a peripherally expressed photoreceptor, and suggesting that, in different species, distinct opsins contribute to varying degrees to the shadow reflex.
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Affiliation(s)
- Thomas Ayers
- Max F. Perutz Laboratories, University of Vienna, Campus Vienna Biocenter, Dr. Bohr-Gasse 9/4, 1030, Vienna, Austria
| | - Hisao Tsukamoto
- Department of Life and Coordination-Complex Molecular Science, Institute for Molecular Science, Okazaki, 444-8585, Japan
- Department of Structural Molecular Science, SOKENDAI (The Graduate University for Advanced Studies), Hayama, Kanagawa, 240-0193, Japan
- Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO), Kawaguchi, Saitama, 332-0012, Japan
| | - Martin Gühmann
- Max Planck Institute for Developmental Biology, Paul-Ehrlich Straße 20, 72076, Tübingen, Germany
| | - Vinoth Babu Veedin Rajan
- Max F. Perutz Laboratories, University of Vienna, Campus Vienna Biocenter, Dr. Bohr-Gasse 9/4, 1030, Vienna, Austria
- Research Platform 'Rhythms of Life', University of Vienna, 1030, Vienna, Austria
| | - Kristin Tessmar-Raible
- Max F. Perutz Laboratories, University of Vienna, Campus Vienna Biocenter, Dr. Bohr-Gasse 9/4, 1030, Vienna, Austria.
- Research Platform 'Rhythms of Life', University of Vienna, 1030, Vienna, Austria.
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11
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Raible F, Takekata H, Tessmar-Raible K. An Overview of Monthly Rhythms and Clocks. Front Neurol 2017; 8:189. [PMID: 28553258 PMCID: PMC5428424 DOI: 10.3389/fneur.2017.00189] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 04/20/2017] [Indexed: 12/18/2022] Open
Abstract
Organisms have evolved to cope with geophysical cycles of different period lengths. In this review, we focus on the adaptations of animals to the lunar cycle, specifically, on the occurrence of biological rhythms with monthly (circalunar) or semi-monthly (circasemilunar) period lengths. Systematic experimental investigation, starting in the early twentieth century, has allowed scientists to distinguish between mythological belief and scientific facts concerning the influence of the lunar cycle on animals. These studies revealed that marine animals of various taxa exhibit circalunar or circasemilunar reproductive rhythms. Some of these rely on endogenous oscillators (circalunar or circasemilunar clocks), whereas others are directly driven by external cues, such as the changes in nocturnal illuminance. We review current insight in the molecular and cellular mechanisms involved in circalunar rhythms, focusing on recent work in corals, annelid worms, midges, and fishes. In several of these model systems, the transcript levels of some core circadian clock genes are affected by both light and endogenous circalunar oscillations. How these and other molecular changes relate to the changes in physiology or behavior over the lunar cycle remains to be determined. We further review the possible relevance of circalunar rhythms for terrestrial species, with a particular focus on mammalian reproduction. Studies on circalunar rhythms of conception or birth rates extend to humans, where the lunar cycle was suggested to also affect sleep and mental health. While these reports remain controversial, factors like the increase in "light pollution" by artificial light might contribute to discrepancies between studies. We finally discuss the existence of circalunar oscillations in mammalian physiology. We speculate that these oscillations could be the remnant of ancient circalunar oscillators that were secondarily uncoupled from a natural entrainment mechanism, but still maintained relevance for structuring the timing of reproduction or physiology. The analysis and comparison of circalunar rhythms and clocks are currently challenging due to the heterogeneity of samples concerning species diversity, environmental conditions, and chronobiological conditions. We suggest that future research will benefit from the development of standardized experimental paradigms, and common principles for recording and reporting environmental conditions, especially light spectra and intensities.
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Affiliation(s)
- Florian Raible
- Max Perutz Laboratories, University of Vienna, Vienna Biocenter, Vienna, Austria
- Research Platform “Rhythms of Life”, University of Vienna, Vienna Biocenter, Vienna, Austria
| | - Hiroki Takekata
- Max Perutz Laboratories, University of Vienna, Vienna Biocenter, Vienna, Austria
- Research Platform “Rhythms of Life”, University of Vienna, Vienna Biocenter, Vienna, Austria
| | - Kristin Tessmar-Raible
- Max Perutz Laboratories, University of Vienna, Vienna Biocenter, Vienna, Austria
- Research Platform “Rhythms of Life”, University of Vienna, Vienna Biocenter, Vienna, Austria
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