Influence of dimethoate on acetylcholinesterase activity and locomotor function in terrestrial isopods

Locomotor behavior in terrestrial organisms is crucial for burrowing, avoiding predators, food seeking, migration, and reproduction; therefore, it is a parameter with ecological relevance. Acetylcholinesterase (AChE) is a nervous system enzyme inhibited by several compounds and widely used as an exp...

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Veröffentlicht in:Environmental toxicology and chemistry 2005-03, Vol.24 (3), p.603-609
Hauptverfasser: Engenheiro, Elizabeth L., Hankard, Peter K., Sousa, Jose P., Lemos, Marco F., Weeks, Jason M., Soares, Amadeu M. V. M.
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container_issue 3
container_start_page 603
container_title Environmental toxicology and chemistry
container_volume 24
creator Engenheiro, Elizabeth L.
Hankard, Peter K.
Sousa, Jose P.
Lemos, Marco F.
Weeks, Jason M.
Soares, Amadeu M. V. M.
description Locomotor behavior in terrestrial organisms is crucial for burrowing, avoiding predators, food seeking, migration, and reproduction; therefore, it is a parameter with ecological relevance. Acetylcholinesterase (AChE) is a nervous system enzyme inhibited by several compounds and widely used as an exposure biomarker in several organisms. Moreover, changes in energy reserves also may indicate an exposure to a stress situation. The aim of this study is to link biomarkers of different levels of biological organization in isopods exposed to increasing doses of dimethoate in semifield conditions. Locomotor parameters, AChE activity, and energy reserves (lipid, glycogen, and protein contents) were evaluated in the isopod Porcellio dilatatus after 48‐h and 10‐d exposure to dimethoate‐contaminated soil. Results showed a clear impairment of both locomotor and AChE activity during the entire study, although effects were more pronounced after 48 h. Most locomotor parameters and AChE activity showed a clear dose‐response relationship. By contrast, no clear trend was observed on energetic components. A positive and significant relationship was found between AChE activity and those locomotor parameters indicating activity, and the opposite was observed with those locomotor parameters indicating confusion and disorientation. The results obtained in this study enhance the importance of linking biochemical responses to parameters with ecological relevance at individual level, the value of locomotor behavior as an important marker to assess effects of toxicants, and also the usefulness and the acquisition of ecological relevance by AChE as a biomarker, by linking it with ecologically relevant behavioral parameters.
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V. M.</creatorcontrib><title>Influence of dimethoate on acetylcholinesterase activity and locomotor function in terrestrial isopods</title><title>Environmental toxicology and chemistry</title><addtitle>Environmental Toxicology and Chemistry</addtitle><description>Locomotor behavior in terrestrial organisms is crucial for burrowing, avoiding predators, food seeking, migration, and reproduction; therefore, it is a parameter with ecological relevance. Acetylcholinesterase (AChE) is a nervous system enzyme inhibited by several compounds and widely used as an exposure biomarker in several organisms. Moreover, changes in energy reserves also may indicate an exposure to a stress situation. The aim of this study is to link biomarkers of different levels of biological organization in isopods exposed to increasing doses of dimethoate in semifield conditions. 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V. M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Influence of dimethoate on acetylcholinesterase activity and locomotor function in terrestrial isopods</atitle><jtitle>Environmental toxicology and chemistry</jtitle><addtitle>Environmental Toxicology and Chemistry</addtitle><date>2005-03</date><risdate>2005</risdate><volume>24</volume><issue>3</issue><spage>603</spage><epage>609</epage><pages>603-609</pages><issn>0730-7268</issn><eissn>1552-8618</eissn><coden>ETOCDK</coden><abstract>Locomotor behavior in terrestrial organisms is crucial for burrowing, avoiding predators, food seeking, migration, and reproduction; therefore, it is a parameter with ecological relevance. Acetylcholinesterase (AChE) is a nervous system enzyme inhibited by several compounds and widely used as an exposure biomarker in several organisms. Moreover, changes in energy reserves also may indicate an exposure to a stress situation. The aim of this study is to link biomarkers of different levels of biological organization in isopods exposed to increasing doses of dimethoate in semifield conditions. Locomotor parameters, AChE activity, and energy reserves (lipid, glycogen, and protein contents) were evaluated in the isopod Porcellio dilatatus after 48‐h and 10‐d exposure to dimethoate‐contaminated soil. Results showed a clear impairment of both locomotor and AChE activity during the entire study, although effects were more pronounced after 48 h. Most locomotor parameters and AChE activity showed a clear dose‐response relationship. By contrast, no clear trend was observed on energetic components. A positive and significant relationship was found between AChE activity and those locomotor parameters indicating activity, and the opposite was observed with those locomotor parameters indicating confusion and disorientation. The results obtained in this study enhance the importance of linking biochemical responses to parameters with ecological relevance at individual level, the value of locomotor behavior as an important marker to assess effects of toxicants, and also the usefulness and the acquisition of ecological relevance by AChE as a biomarker, by linking it with ecologically relevant behavioral parameters.</abstract><cop>Hoboken</cop><pub>Wiley Periodicals, Inc</pub><pmid>15779760</pmid><doi>10.1897/04-131R.1</doi><tpages>7</tpages></addata></record>
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subjects Acetylcholinesterase
Acetylcholinesterase - metabolism
Animal, plant and microbial ecology
Animals
Applied ecology
Biochemistry
Biological and medical sciences
Biomarker
Biomarkers
Crustaceans
Dimethoate
Dimethoate - toxicity
Ecotoxicology, biological effects of pollution
Energy
Energy reserves
Fundamental and applied biological sciences. Psychology
General aspects
Glycogen - analysis
Insecticides - toxicity
Isopoda
Isopoda - drug effects
Isopoda - metabolism
Isopoda - physiology
Lipids - analysis
Locomotor behavior
Motor ability
Motor Activity - drug effects
Porcellio dilatatus
Porcellionidae
Predators
Proteins - analysis
Soil contamination
Soil Pollutants - toxicity
Stress analysis
Survival Analysis
Terrestrial ecosystems
Toxicants
title Influence of dimethoate on acetylcholinesterase activity and locomotor function in terrestrial isopods
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