Effects of bilateral striatal 6-OHDA lesions on circadian rhythms in the rat
Identifieur interne : 001206 ( Istex/Corpus ); précédent : 001205; suivant : 001207Effects of bilateral striatal 6-OHDA lesions on circadian rhythms in the rat
Auteurs : V. Ben ; B. BruguerolleSource :
- Life Sciences [ 0024-3205 ] ; 2000.
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.
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DOI: 10.1016/S0024-3205(00)00751-7
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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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<sourceDesc><biblStruct type="inbook"><analytic><title level="a">Effects of bilateral striatal 6-OHDA lesions on circadian rhythms in the rat</title>
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<surname>Ben</surname>
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<abstract xml:lang="en"><p>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.</p>
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<head><ce:dochead><ce:textfn>Pharmacology letters</ce:textfn>
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<ce:title>Effects of bilateral striatal 6-OHDA lesions on circadian rhythms in the rat</ce:title>
<ce:subtitle>A radiotelemetric study</ce:subtitle>
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<ce:abstract-sec><ce:simple-para>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.</ce:simple-para>
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<ce:keyword><ce:text>Circadian rhythms</ce:text>
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<ce:keyword><ce:text>Chronopharmacology</ce:text>
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<abstract 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.</abstract>
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<topic>Locomotor activity</topic>
<topic>6-Hydroxydopamine (6-OHDA)</topic>
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