Cited by 78Parkinson's Disease Mechanisms and TreatmentsNeurological disorders and treatmentsNeurotransmitter Receptor Influence on Behavior

Behavioral differences in a rotenone-induced hemiparkinsonian rat model developed following intranigral or median forebrain bundle infusion

Sindhu, Kizhakke M., Saravanan, Karuppagounder S., Mohanakumar, Kochupurackal P.·2005·Brain Research

Abstract

A mitochondrial complex-I inhibitor, rotenone was unilaterally infused into the substantia nigra pars compacta (SNpc) or median forebrain bundle (MFB) to create hemiparkinsonian animal models and investigated spontaneous and drug-induced stereotypic rotations, as well as certain postural behaviors in Sprague-Dawley rats. Animals infused intranigrally, but not intra-MFB, with rotenone exhibited spontaneous contralateral rotations immediately after recovery from anesthesia. Head position bias and elevated body swing test showed insignificant contralateral bias in animals with nigral damage but a significant ipsilateral bias in MFB-lesioned rats. General motor activity of the animals was reduced in both the groups as indicated by reduced performance on a Plus-Maze. Intranigrally, rotenone-infused animals exhibited progressive ipsilateral rotations when challenged with d-amphetamine on the 7th, 14th, 21st, and 28th days or with apomorphine on 9th, 16th, 23rd, and 30th days. However, animals that received rotenone in MFB exhibited ipsilateral or contralateral rotations when challenged respectively with d-amphetamine or apomorphine only in the 5th week (28th and 30th days). Stereotaxic administration of rotenone into SNpc or MFB caused a significant loss of dopamine in the ipsilateral striatum (>80% in SNpc; >95% in MFB), when assayed employing an HPLC equipped with electrochemical detector on the 32nd day. Neuronal loss in SNpc was confirmed in coronal sections stained with cresyl violet and revealed extension of lesion towards SN pars reticulata, in SNpc-infused animals. Our results demonstrate that rotenone-induced neurodegeneration is a slow, yet progressive process similar to that in idiopathic Parkinson's disease and unlike that observed in other classical neurotoxin-mediated lesions which are abrupt and developed in few hours to days. Thus, intranigral or intra-MFB infusion of rotenone could be used for producing hemiparkinsonian animal models in rats. These findings further suggest that, while both d-amphetamine and apomorphine-induced stereotypic rotations could be used as a valuable behavioral assay procedure to test novel drugs against Parkinson's disease, yet apomorpine-induced contralateral bias in turning is a reliable indicator of specific destruction in nigrostriatal pathway and development of postsynaptic dopamine receptor supersensitivity.

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Crossref · 10.1016/j.brainres.2005.05.051

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Authors
Sindhu, K. M., Saravanan, K. S., & Mohanakumar, K. P.
Affiliations
Indian Institute of Chemical Biology (IN)
Corresponding author
Mohanakumar, Kochupurackal P.
Venue
Brain Research
Publisher
Elsevier BV
Published
2005-07
Volume
1051
Issue
1-2
Pages
25-34
ISSN
0006-8993 (ISSN-L)
OpenAlex
W2091103491
Cited by
78
References
59
Citations by year
2025: 1 · 2024: 2 · 2023: 1 · 2022: 3 · 2021: 2 · 2020: 2 · 2019: 1 · 2018: 2 · 2017: 7 · 2016: 5 · 2015: 4 · 2014: 5 · 2013: 9 · 2012: 6
FWCI
2.59
Type
journal article
Language
en
Open access
closed
Locations
  • Brain Research (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Health Sciences › Medicine › Neurology › Neurological disorders and treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
rotenone, Parkinson's disease, substantia nigra pars compacta, apomorphine challenge, dopamine depletion, nigrostriatal pathway, mitochondrial complex I inhibition, postural behavior, motor activity, neurodegeneration, behavioral assays
MeSH terms
Amphetamine, Animals, Dopamine, Enzyme Inhibitors, Exploratory Behavior, Functional Laterality, Medial Forebrain Bundle, Microinjections, Motor Activity, Neurons, Posture, Rotenone, Stereotyped Behavior, Substantia Nigra, Oxidopamine, Adrenergic Agents, Parkinsonian Disorders, Electron Transport Complex I, Rotarod Performance Test, Rats

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