Effects of bilateral striatal 6-OHDA lesions on circadian rhythms in the rat: a radiotelemetric study.
Identifieur interne : 000136 ( Ncbi/Merge ); précédent : 000135; suivant : 000137Effects of bilateral striatal 6-OHDA lesions on circadian rhythms in the rat: a radiotelemetric study.
Auteurs : V. Ben [France] ; B. BruguerolleSource :
- Life sciences [ 0024-3205 ] ; 2000.
English descriptors
- KwdEn :
- Animals, Body Temperature (physiology), Corpus Striatum (drug effects), Disease Models, Animal, Heart Rate (physiology), Locomotion (physiology), Male, Oxidopamine, Parkinson Disease, Secondary (chemically induced), Parkinson Disease, Secondary (physiopathology), Rats, Rats, Wistar, Sleep Disorders, Circadian Rhythm (etiology), Sleep Disorders, Circadian Rhythm (physiopathology), Telemetry (methods), Weight Loss (drug effects).
- MESH :
- chemical : Oxidopamine.
- chemically induced : Parkinson Disease, Secondary.
- drug effects : Corpus Striatum, Weight Loss.
- etiology : Sleep Disorders, Circadian Rhythm.
- methods : Telemetry.
- physiology : Body Temperature, Heart Rate, Locomotion.
- physiopathology : Parkinson Disease, Secondary, Sleep Disorders, Circadian Rhythm.
- Animals, Disease Models, Animal, Male, Rats, Rats, Wistar.
Abstract
The present work aims to document, in a previously described animal model of Parkinson (double bilateral striatal injection of 6-OHDA), the possible modifications of circadian markers rhythms i.e. temperature (T), heart rate (H) and locomotor activity (A) registered continuously by telemetry, in order to evaluate a possible perturbation of the circadian rythmicity. H, T and A were measured by radiotelemetry after surgical implantation of the transmitters (Data Sciences). After a recovery period, the study was divided into a control period (C) for baseline measurements of T, H and A daily rhythms. Then, the stereotaxic 6-OHDA striatal lesion was done to a group of 4 rats while the control rats were injected into striata with saline; a second period of four registration weeks was observed [D 1-7 (W1), D 8-14 (W2), D 15-21 (W3), D 22-28 (W4)]. Finally, at the end of this period the seven rats were decapited in order to determine their striatal dopamine (DA) content. Our data document that the circadian rhythms of H, T and A were differently affected according to time. Thus, a temporary loss of circadian periodicity was observed particularly for heart rate. 6-OHDA-induced modifications of H, T and A circadian rhythm characteristics were also observed: a significant decrease of the mesor was observed for the three rhythms as well as a phase advance. Concerning the amplitude of these rhythms, only H was significantly decreased. These perturbations were observed during the four weeks following the intervention, never reaching the initial control levels. Such observed perturbations would supply a basis for the future study of the chronopharmacology of antiparkinsonian drugs.
PubMed: 10983850
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pubmed:10983850Le document en format XML
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<front><div type="abstract" xml:lang="en">The present work aims to document, in a previously described animal model of Parkinson (double bilateral striatal injection of 6-OHDA), the possible modifications of circadian markers rhythms i.e. temperature (T), heart rate (H) and locomotor activity (A) registered continuously by telemetry, in order to evaluate a possible perturbation of the circadian rythmicity. H, T and A were measured by radiotelemetry after surgical implantation of the transmitters (Data Sciences). After a recovery period, the study was divided into a control period (C) for baseline measurements of T, H and A daily rhythms. Then, the stereotaxic 6-OHDA striatal lesion was done to a group of 4 rats while the control rats were injected into striata with saline; a second period of four registration weeks was observed [D 1-7 (W1), D 8-14 (W2), D 15-21 (W3), D 22-28 (W4)]. Finally, at the end of this period the seven rats were decapited in order to determine their striatal dopamine (DA) content. Our data document that the circadian rhythms of H, T and A were differently affected according to time. Thus, a temporary loss of circadian periodicity was observed particularly for heart rate. 6-OHDA-induced modifications of H, T and A circadian rhythm characteristics were also observed: a significant decrease of the mesor was observed for the three rhythms as well as a phase advance. Concerning the amplitude of these rhythms, only H was significantly decreased. These perturbations were observed during the four weeks following the intervention, never reaching the initial control levels. Such observed perturbations would supply a basis for the future study of the chronopharmacology of antiparkinsonian drugs.</div>
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<ArticleTitle>Effects of bilateral striatal 6-OHDA lesions on circadian rhythms in the rat: a radiotelemetric study.</ArticleTitle>
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<Abstract><AbstractText>The present work aims to document, in a previously described animal model of Parkinson (double bilateral striatal injection of 6-OHDA), the possible modifications of circadian markers rhythms i.e. temperature (T), heart rate (H) and locomotor activity (A) registered continuously by telemetry, in order to evaluate a possible perturbation of the circadian rythmicity. H, T and A were measured by radiotelemetry after surgical implantation of the transmitters (Data Sciences). After a recovery period, the study was divided into a control period (C) for baseline measurements of T, H and A daily rhythms. Then, the stereotaxic 6-OHDA striatal lesion was done to a group of 4 rats while the control rats were injected into striata with saline; a second period of four registration weeks was observed [D 1-7 (W1), D 8-14 (W2), D 15-21 (W3), D 22-28 (W4)]. Finally, at the end of this period the seven rats were decapited in order to determine their striatal dopamine (DA) content. Our data document that the circadian rhythms of H, T and A were differently affected according to time. Thus, a temporary loss of circadian periodicity was observed particularly for heart rate. 6-OHDA-induced modifications of H, T and A circadian rhythm characteristics were also observed: a significant decrease of the mesor was observed for the three rhythms as well as a phase advance. Concerning the amplitude of these rhythms, only H was significantly decreased. These perturbations were observed during the four weeks following the intervention, never reaching the initial control levels. Such observed perturbations would supply a basis for the future study of the chronopharmacology of antiparkinsonian drugs.</AbstractText>
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