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The Use of Selected Anaesthetic Drugs in Search of a Method for Improving Earthworms’ Welfare

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The Use of Selected Anaesthetic Drugs in Search of a Method for Improving Earthworms’ Welfare Journal of Ecological Engineering Volume 14, No. 3, July 2013, pp. 83–88 DOI: 10.5604/2081139X.1056052 Research Article THE USE OF SELECTED ANAESTHETIC DRUGS IN SEARCH OF A METHOD FOR IMPROVING EARTHWORMS’ WELFARE Agnieszka Podolak-Machowska1, Joanna Kostecka1, Tadeusz Librowski2, Barbara Plytycz3 1 Department of Biological Bases of Agriculture and Environmental Education, Faculty of Biology and Agriculture, Rzeszów University, Ćwiklińskiej 2, 25-601 Rzeszów, Poland, e-mail: [email protected] 2 Department of Radioligands, Faculty of Pharmacy, Collegium Medicum, Jagiellonian University, Medyczna 9, 30- 688 Kraków, Poland, e-mail: [email protected] 3 Department of Evolutionary Immunology, Institute of Zoology, Jagiellonian University, Gronostajowa 9, 30-387 Kraków, Poland, e-mail: [email protected] Received: 2013.05.15 ABSTRACT Accepted: 2013.06.17 This paper describes selected effects of body contact of earthworms Dendrobaena Published: 2013.07.10 veneta Rosa with local anaesthetic (LA) drugs used for human anesthesia (lidocaine and prilocaine) and anaesthetics for aquatic animals (MS-222). The findings showed safe and effective immobilization of earthworms with prilocaine at a concentration of 0.25-1%. At the applied concentrations lidocaine was safe, but less effective. On the other hand, MS-222, at the applied concentrations had a strongly irritating effect for earthworms and induced convulsive body movements connected with a discharge of coelomic fluid. The results may be relevant both for improving the welfare of earth- worms during experiments and for the organization of research involving testing drugs on invertebrates. In this case, by using earthworms as an experimental model and by applying the method for measuring their mobility after contact with anaesthetics, which has been described in this article, it might be possible to replace experiments on guinea pigs, rabbits, rats and mice, which are expensive and require an approval of an ethics committee, with laboratory tests on earthworms. Keywords: local anaesthetics (LA), pharmacological screening, MS-222, earthworms, Dendrobaena veneta Rosa, welfare of laboratory animals. INTRODUCTION The use of animals in research proce- dures should comply with Directive [Directive Earthworms (Lumbricidae) have been used in 2010/63/EU] of the European Parliament and of a variety of field research [Lukkari et al. 2004] the Council, because of the new available sci- and laboratory experiments [Plytycz et al. 2011] entific knowledge on factors impacting animals’ for a long time, and due to their high sensitivity welfare. Recent studies have provided evidence to environmental stress they are a good model for for the capability of all animals to respond to identifying pollution in ecosystems [Kostecka et stress, pain, suffering or distress. Therefore, cur- al. 2012]. To meet the requirements of numerous rently the problem of laboratory animals’ wel- experiments, it is necessary to temporarily immo- fare is frequently discussed, what leads to raising bilize specimens while keeping them alive. To en- minimum standards for handling these animals in sure humanitarian method of such a treatment it conformity with the latest scientific accomplish- should be performed “under anasthesia”, because ments. Similarly, the public opinion expresses annelids (Annelida), just like any living organ- concern for the use of animals in various proce- isms, show sensitivity to external stimuli (ladder- dures, therefore, they should always be treated as like nervous system [Jura 2007]). feeling creatures and their use should be limited 83 Journal of Ecological Engineering vol. 14(3), 2013 to the areas which can benefit the well-being of ible elimination of pain stimuli conduction with people, animals and the environment. It should no loss in consciousness [Calvey 1995], contrary be emphasized that animals should be used for to general anaesthetics which lead to analgesia, research or educational purposes only if there is loss of consciousness, muscle relaxation and loss no other means to investigate specific problems. of reflexes. Importantly, depending on the chemi- The choice of adequate research methods is also cal structure and pharmacodynamic properties of of key importance as they will allow for obtaining local anaesthetics (LA) their half-life, and conse- most satisfying results while causing the lowest quently their activity period is different [Bujak- levelof suffering. Other important aspects of re- Giżycka et al. 2009]. searchers’ work include protection of biological In the case of earthworms the previously ap- diversity that is why the use of endangered spe- plied anaesthetics, e.g. chloroform or contact cies in research should be limited to the unavoid- with cold surfaces, exert an irritating effect, and able minimum. induce convulsive body movements linked with With regards to the implementation of the excretion of coelomic fluid through the pores in Directive [Directive 2010/63/EU] on the pro- the body surface, and discharged along with it tection of animals used for scientific purposes, are coelomocytes, i.e. cells responsible for the it is important to introduce methods and means immunity of earthworms. Reduction in the pool improving their condition during experiments of coelomocytes may impact a number of body (in accordance with the principles of replacing functions. Coelomocytes discharge through the them, limiting their participation or enhancing pores in the body surface are collected in a non- the procedures of animal research). To ensure invasive way for research related to immunology. proper treatment of animals used in experiments These are obtained by exciting earthworms in a it is necessary to keep them in conditions meeting controlled manner, by immersing them in 5% eth- their living requirements [Annex III 2010/63/EU] anol [Cooper et al. 1995], by ultrasound stimula- and to introduce such organizational innovations tion [Hendawi et al. 2004] or by stimulation with which allow for improving welfare of laboratory weak electric current [Roch 1979], which induces animals and for reducing their exposure to stress. violent movements of the body (wiggling) and a Importantly, considerations related to the discharge of coelomic fluid with coelomocytes concept of “animal welfare” must be interdis- suspended in it. In many earthworm species, ciplinary, since they involve a combination of including Dendrobaena veneta, coelomocytes domains: scientific, ethical and even economic. include a high rate of eleocytes (chloragocytes) While developing measures focusing on animal separated from chloragogen tissue; riboflavin (i.e. welfare it is also necessary to recognize a signifi- vitamin B2) accumulated in their granules tints, cant function of broadly understood social sci- the discharged fluid with yellow colour and its ences because of the need of better understanding contents can be measured with spectrofluorimeter of the man-animal relationships and to establish [Plytycz and Morgan 2011]. effective education which not only practically af- The present study was an attempt to apply fects the treatment of animals in laboratories but local anaesthetics (LA) used in humans (prilo- also impacts the conditions of livestock and will caine and lidocaine) and an agent administered to contribute to the development of sustainable agri- aquatic animals (MS-222), to anesthetize earth- culture as such [Keeling 2005; Lund et al. 2006]. worms, which could contribute to improving their The results of studies investigating the activ- welfare during experiments. The measure of an- ity of local anaesthetics may contribute to im- esthesia was their response to stimulation with proved welfare of laboratory animals [Librowski weak electric current. et al. 2001]. Drugs of this type include prilocaine and lidocaine, which reversibly hinder conduc- tion in nervous fibers. These substances have MATERIAL AND METHODS become widely used in anesthetizing specific parts of the human body and they neutralize cen- The experiment was designed to test the ac- tral pain syndromes [Librowski et al. 2004]. The tivity of local anaesthetics: lidocaine (Fischer mechanism of activity in this group of drugs is Chemicals) and prilocaine (Sigma Aldrich) as based on blocking voltage-gated sodium channels well as MS-222 (Tricaine methanesulfonate; [Bujak-Giżycka et al. 2009] and leads to revers- Ethyl 3-aminobenzoate methanosulfonate salt; 84 Journal of Ecological Engineering vol. 14(3), 2013 Sigma Aldrich; Fluca). Various concentrations of The obtained recordings were analyzed using the aforementioned solutions were used to anes- BEST player v. 2.106, and the results were pre- thetize adult (clitellate) specimens of the earth- sented as mean values and standard errors (Mean worm species Dendrobaena veneta Rosa. A series + SE) obtained using Microsoft Excel v. 2010. of experiments was conducted in 2012. Statistically significant differences were deter- Earthworms, in groups of six specimens, mined using a student’s t-test (p<0.05). were placed in Petri dishes filled with PBS–solu- tion (0.9% saline solution) in the case of controls (0%), or filled with solutions of lidocaine, prilo- RESULTS AND DISCUSSION caine or MS-222 (with concentrations of 0.125% – 2%) in PBS – in the case of respective experi- The study showed earthworms’ different re- mental groups (Table 1). sponses resulting from the contact with the test Observation of earthworms’ response to the substances. In the control groups, during the solution
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