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Photokinesis and Djopsin gene expression analysis during the regeneration of planarian eyes

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Integrative Zoology 2017年第2期12卷 157-164页

作者： Zimei DONG Yanqing YUWEN Yingxu SIMA Yanping DONG Huina ZHAN Guangwen CHEN Dezeng LIU College of Life Science Henan Normal UniversityXinxiangHenanChina

planarians provide the ideal model for studying eye development,with their simple eye structure and exceptionally rapid ***,we observed the eye morphogenesis,photophobic behavior,spectral sensitivity and expression pattern of Djopsin in the freshwater planarian Dugesia *** results showed that:(i)Djopsin encoding the putative protein belonged to the rhabdomeric opsins group and displayed high conservation during animal evolution;(ii)planarians displayed diverse photophobic response to different visible wavelengths and were more sensitive to light blue(495 nm)and yellow(635 nm);(iii)the morphogenesis and functional recovery of eyes were related to the expression pattern of Djopsin during head regeneration;and(iv)Djopsin gene plays a major role in functional recovery during eye regeneration and visual system maintenance in adult planarians.

关键词： eye regeneration opsin photophobic response planarian

Magnetic Field Intensity/Melatonin-Molarity Interactions: Experimental Support with planarian (Dugesia sp.) Activity for a Resonance-Like Process

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Open Journal of Biophysics 2012年第4期2卷 137-143页

作者： Bryce P. Mulligan Noa Gang Glenn H. Parker Michael A. Persinger Department of Biology Behavioural Neuroscience Program Department of Biology Behavioural Neuroscience Program Biomolecular Sciences Program Laurentian UniversitySudbury Canada Department of Biology Behavioural Neuroscience ProgramBiomolecular Sciences Program Laurentian UniversitySudbury Canada

Synergistic interactions between specific magnetic field intensities and chemical concentrations are challenging biophysical phenomena. planarian were exposed to one of five different concentrations of melatonin and to a “geomagnetic”—patterned 7 Hz amplitude modulated magnetic field for 6 min once per hour for 8 hr during six successive nights. The peak average strengths were within the range (50 nT) or outside the range (200 nT) derived by the equation. As predicted by a resonance equation planarian displayed highly statistically significant decreased relative activity within the 50 nT, 10–7 to 10–6 M melatonin conditions compared to lower or higher concentrations. The effect explained about 30% of the variance in these changes of activity. Activity of planarian exposed to the same melatonin concentrations but to the 200 nT field did not differ significantly from each other or from those exposed to the 50 nT field in concentrations of melatonin –7 M or >10–6 M. These results suggest the existence of non-linear, “narrow-band” mechanisms involving the numbers of molecules within a distance determined by the boundary of the organism and the intensity of naturally-patterned magnetic fields derived from energy rather than force-based resonances.

关键词： Resonance planarian Melatonin Magnetic Fields 7 Hz

Application of planarian Brain Regeneration: Detection of Water Pollution

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Open Journal of Ecology 2023年第2期13卷 95-105页

作者： Jing Kang Lulu Xiao Wentao Yin Ang Zhao Xixi Dong College of Life Science Xinxiang Medical University Xinxiang China

Due to over industrialisation, the environmental pollution problem is becoming increasingly serious, especially in aquatic ecosystems. Compared with traditional physical and chemical detection methods, the use of biological indicators has become popular. The freshwater planarian Dugesia japonica is distributed extensively in aquatic ecosystems and has been applied to the area of environmental toxicology for its high chemical sensitivity. Moreover, D. japonica also has a powerful regenerative capability in which the injured planarian can regenerate a new brain in 5 days and complete an adult individual remodelling in 14 days. Therefore, it has been used as a new model organism in the field of neuro-regeneration toxicology. In our past study, D. japonica can be used as a biological indicator to detect water pollution. This can provide basic data for the detection of water pollution and provide a warning system in regard to aquatic ecosystems.

关键词： planarian Brain Regeneration Aquatic Ecosystem Detection Neuro-Regeneration Toxicology

Molecular actions guiding neural regeneration in planarian

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Neuroscience Bulletin 2008年第5期24卷 329-337页

作者：张燕芬叶波平王大勇中国药科大学生命科学技术学院东南大学基础医学院遗传与发育系南京210009 东南大学发育与疾病相关基因教育部重点实验室南京210009 东南大学基础医学院遗传与发育系

planarian is among the simplest animals that possess a centralized nervous system （CNS）, and its neural regenera- tion involves the replacement of cells lost to normal ＇wear and tear＇（cell turnover）, and/or injury. In this review, we state and discuss the recent studies on molecular control of neural regeneration in planarians. The spatial and temporal expression patterns of genes in intact and regenerating planarian CNS have already been described relatively clearly. The bone morphogenetic protein （BMP） and Wnt signaling pathways are identified to regulate neural regeneration. During neural regeneration, conserved axon guidance mechanisms are necessary for proper wiring of the nervous system. In addition, apoptosis may play an important role in controlling cell numbers, eliminating unnecessary tissues or cells and remodeling the old tissues for regenerating CNS. The bilateral symmetry is established by determination of anterior-posterior （A-P） and dorsal-ventral （D-V） patterns. Moreover, neurons positive to dopamine, serotonin （5-HT）, and gamma-aminobutyric acid （GABA） have been detected in planarians. Therefore, planarians present us with new, experimentally accessible contexts to study the molecular actions guiding neural regeneration.

关键词： neural regeneration central nervous system molecular mechanism planarian

Bioaccumulation and Toxicity of Neodymium in the planarian Dugesia japonica

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Agricultural Science & Technology 2014年第8期15卷 1364-1367页

作者：邢军张秀珍王学山东药品食品职业学院山东淄博255011 山东理工大学生命科学学院山东淄博255049

In this study, the bioaccumulation and toxicity of neodymium （Nd） in pla-narian Dugesia japonica were investigated. The results showed that with the in-creasing dietary Nd supplementation, the concentration of Nd in the planarian showed a significant linear increase and the balance of mineral elements was bro-ken with the decrease of Ca, Fe and Mo, and the increase of K and Mg. The content of soluble proteins and the activities of superoxide dismutase （SOD） and catalase （CAT） decreased with the increase of Nd concentration, while the content of H2O2 rose gradual y. The mortality was directly proportional to the Nd concentra-tion. The results indicated that planarian is a very sensitive aquatic animal to Nd contamination and can be an indicator organism for Nd pol ution.

关键词： Nd planarian Antioxidant enzymes Toxic effects

A comprehensive review:Research status and trends of planarianology in China

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Zoological Systematics 2023年第2期48卷 117-125页

作者： Hecai Zhang Junhua He Changying Shi Guangwen Chen Dezeng Liu College of Life Sciences Henan Normal UniversityXinxiang 453007China

planarian is an excellent model for studying several scientific issues,and planarianology has become an active research field in the *** at home and abroad have conducted a lot of in-depth studies on planarians in various *** paper outlined the panorama of planarian research in China and summarized the advances from three aspects of taxonomy,molecular phylogeny and phylogeography,regeneration,tissue homeostasis and immunity as well as ***,the current problems and future development direction and tendency of planarian research in China are briefly analyzed and ***,the catalogue of planarians in China is also presented.

关键词： Review planarian taxonomy regeneration toxicology China

Molecular systematics, population genetics and phylogeography on planarians(Platyhelminths: Turbellaria): A brief review of molecular markers

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Zoological Systematics 2019年第3期44卷 177-184页

作者： Hecai Zhang Tiange Hu Changying Shi Guangwen Chen College of Life Sciences Henan Normal University

Due to their characteristics, such as powerful regeneration capability, high susceptibility to xenobiotics, wide distribution and weak dispersion ability, planarians are used as ideal test animals in several research fields, and planarianology has become a more and more active subject. This paper reviews the research progress of planarians from the aspects of molecular phylogeny, molecular taxonomy, population genetics and phylogeography, and also summarizes the corresponding molecular markers applied. Moreover, the future direction and tendency in this field is briefly analyzed and prospected.

关键词： planarian molecular marker molecular phylogeny molecular taxonomy, population genetics phylogeography

Disruption of Drug Effects (Dopamine, Nicotine, Pilocarpine, κ-Opioid) in planarians by UV Light

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Pharmacology & Pharmacy 2012年第3期3卷 358-363页

作者： Robert B. Raffa Christopher S. Tallarida Aruj Choudhry Nadia Sanni-Adam Sean McGonigle Michael Baron Zhuo L. Chen Scott M. Rawls Ronald J. Tallarida Department of Pharmaceutical Sciences Temple University School of Pharmacy Philadelphia PA U.S.A. Department of Pharmacology Temple University School of Medicine and Center for Substance Abuse Research Temple University Philadelphia PA U.S.A.

Based on previous work, it has been hypothesized that the energetics of ultraviolet (UV) light disrupts effects induced by receptor-binding ligands. If this hypothesis is true, then UV light should (i) disrupt a broad variety of endpoints and (ii) disrupt effects produced by ligands that bind to diverse receptor types. This was tested directly in the present study by using ligands selective for four different receptors (one ionotropic, three metabotropic) and three different behavioral endpoints. The selective dopamine D2 receptor antagonist (–)sulpiride (0.1 uM) dose-relatedly decreased spontaneous locomotor velocity, the selective nicotinic acetylcholine receptor agonist nicotine (1, 3, 5 mM) and the selective muscarinic acetylcholine receptor agonist pilocarpine (20, 30, 50 mM) induced seizure-like activity, and the selective-opioid receptor agonist U-50,488H (10 uM) produced physical dependence (manifested as abstinence-induced withdrawal) in planarian models. Each of these diverse ligand and receptor-mediated effects were attenuated by UV light (254 nm = 7.83 × 10–19 J = 4.89 eV). These findings provide further evidence that UV light disrupts ligand-receptor mediated interactions and that UV light might provide a useful tool for examining drug-receptor interactions.

关键词： UV Light Drug-Receptor Interaction Locomotor Activity Seizure Physical Dependence planarian

A new species of the genus Girardia(Tricladida: Dugesiidae) from China

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Zoological Systematics 2015年第2期40卷 166-178页

作者： Xiao-Min Chen Yu-Hui Chen Cheng-Chen Wu An-Tai Wang College of Life Science Shenzhen Key Laboratory of Marine Bioresources and Ecology Institute of Nuclear Agricultural Sciences Zhejiang University

The genus Girardia （Tricladida： Dugesiidae） was recorded in China for the first time. A new freshwater turbellarian species, G. sinensis Chen ＆ Wang, sp. nov., is described, which was collected from Xinghu Lake, Zhaoqing, Guangdong Province, China. Observation and analysis of the new species was conducted on morphology, habits, reproduction, histochemistry and molecular phylogenetics. In addition, the results indicated that morphological differences of AChE^＋ nerve structure can be used as a distinguishable character for species identification of Dugesiidae.

关键词： planarian new species China biological characteristics phylogenetics.