{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T13:58:55Z","timestamp":1790517535666,"version":"4.1.0"},"reference-count":47,"publisher":"Institute of Physiology of the Czech Academy of Sciences","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Physiol Res"],"published-print":{"date-parts":[[2018,12,28]]},"abstract":"<jats:p>Psychostimulants, as well as cannabinoids, have been shown to significantly affect a great variety of behaviors in both humans and laboratory animals. Our previous studies have repeatedly demonstrated that the application of the vehicle for psychostimulants, i.e. saline, to control groups, generated different behavioral test results compared to absolute na\u00efve controls (i.e. without any injection). Therefore, our present study has set three goals: (1) to evaluate the effect of three different psychostimulant drugs, (2) to evaluate the effect of three doses of delta 9-tetrahydrocannabinol (THC), and (3) to evaluate the effect of saline and ethanol injections vs sham injections and no injection on spontaneous behavior of adult male rats. The LABORAS test (Metris B.V., Netherlands) was used to examine spontaneous locomotor activity and exploratory behavior in an unknown environment over 1 h. In Experiment 1, psychostimulant drugs were tested: single subcutaneous (s.c.) injections of amphetamine (5 mg\/kg), cocaine (5 mg\/kg), and 3,4-methylenedioxymethamphetamine (MDMA) (5 mg\/kg) were applied prior to testing. Control animals received the same volume (1 ml\/kg) of s.c. saline. In Experiment 2, the effect of three doses of THC (1, 2, and 5 mg\/kg, s.c.) were examined. An s.c. injection of vehicle (ethanol) was used as a control. In Experiment 3, injections of saline and ethanol were compared to the group receiving a sham s.c. injection and to a group of absolute \u201cna\u00efve\u201d controls. Our results demonstrated that (1) all sychostimulants increased locomotion time, distance traveled, and speed while decreasing immobility time of adult male rats relative to saline controls. The most prominent effect was associated with MDMA; (2) The effect of THC was dose-dependent and was most apparent within the first 10 min of the LABORAS test. (3) With regard to the effect of injection: absolute controls (without injection) compared to animals injected with ethanol, saline, or sham-injected displayed reduced immobility time, traveled longer distances, and had increased speed. In conclusion, our data showed drug dependent behavioral changes in adult male rats after application of psychostimulants and cannabinoids. Our findings also suggest that not only drugs but the actual single injection per se also affects the behavior of laboratory animals in an unknown environment. This effect seems to be associated with the acute stress associated with the injection.<\/jats:p>","DOI":"10.33549\/physiolres.934053","type":"journal-article","created":{"date-parts":[[2019,11,14]],"date-time":"2019-11-14T12:59:33Z","timestamp":1573736373000},"page":"S665-S672","source":"Crossref","is-referenced-by-count":10,"title":["What is the Role of Subcutaneous Single Injections on the Behavior of Adult Male Rats Exposed to Drugs?"],"prefix":"10.33549","author":[{"given":"R.","family":"\u0160LAMBEROV\u00c1","sequence":"first","affiliation":[{"name":"Department of Physiology, Third Faculty of Medicine, Charles University, Prague, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K.","family":"NOHEJLOV\u00c1","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"OCHOZKOV\u00c1","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L.","family":"MIHAL\u010c\u00cdKOV\u00c1","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"19169","published-online":{"date-parts":[[2018,12,19]]},"reference":[{"key":"ref0","doi-asserted-by":"publisher","unstructured":"BERN\u00c1\u0160KOV\u00c1 K, TOMKOV\u00c1 S, \u0160LAMBEROV\u00c1 R: Are changes in excitability in the hippocampus of adult male rats induced by prenatal methamphetamine exposure or stress? 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