Sökning: id:"swepub:oai:lup.lub.lu.se:2fc8b3f1-1215-4592-a02c-d5c23f06f578" >
Characterization of...
Characterization of behavioral and neurodegenerative changes following partial lesions of the nigrostriatal dopamine system induced by intrastriatal 6-hydroxydopamine in the rat
-
- Kirik, Deniz (författare)
- Lund University,Lunds universitet,Brain Repair and Imaging in Neural Systems (BRAINS),Forskargrupper vid Lunds universitet,Lund University Research Groups
-
Rosenblad, Carl (författare)
-
- Björklund, Anders (författare)
- Lund University,Lunds universitet,Neurobiologi,Forskargrupper vid Lunds universitet,Neurobiology,Lund University Research Groups
-
(creator_code:org_t)
- Elsevier BV, 1998
- 1998
- Engelska.
-
Ingår i: Experimental Neurology. - : Elsevier BV. - 0014-4886. ; 152:2, s. 259-277
- Relaterad länk:
-
http://dx.doi.org/10...
-
visa fler...
-
https://lup.lub.lu.s...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- Partial lesions of the nigrostriatal dopamine system have been investigated with respect to their ability to induce consistent long-lasting deficits in movement initiation and skilled forelimb use. In eight different lesion groups 6-hydroxydopamine (6-OHDA) was injected at one, two, three, or four sites into the lateral sector of the right striatum, in a total dose of 20-30 microgram. Impairments in movement initiation in a forelimb stepping test, and in skilled paw use in a paw-reaching test, was seen only in animals where the severity of the lesion exceeded a critical threshold, which was different for the different tests used: single (1 x 20 microgram) or two-site (2 x 10 microgram) injections into the striatum had only small affects on forelimb stepping, no effect on skilled paw use. More pronounced deficits were obtained in animals where the same total dose of 6-OHDA was distributed over three or four sites along the rostro-caudal extent of the lateral striatum or where the injections were made close to the junction of the globus pallidus. The results show that a 60-70% reduction in tyrosine hydroxylase (TH)-positive fiber density in the lateral striatum, accompanied by a 50-60% reduction in TH-positive cells in substantia nigra (SN), is sufficient for the induction of significant impairment in initiation of stepping. Impaired skilled paw-use, on the other hand, was obtained only with a four-site (4 x 7 microgram) lesion, which induced 80-95% reduction in TH fiber density throughout the rostrocaudal extent of the lateral striatum and a 75% loss of TH-positive neurons in SN. Drug-induced rotation, by contrast, was observed also in animals with more restricted presymptomatic lesions. The results indicate that the four-site intrastriatal 6-OHDA lesion may be a relevant model of the neuropathology seen in parkinsonian patients in a manifest symptomatic stage of the disease and may be particularly useful experimentally since it leaves a significant portion of the nigrostriatal projection intact which can serve as a substrate for regeneration and functional recovery in response to growth promoting and neuroprotective agents.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Neurologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Neurology (hsv//eng)
Nyckelord
- Parkinson's disease
- 6-hydroxydopamine
- tyrosine hydroxylase
- stepping
- paw-use
- sensorimotor behavior
- cell loss
- stereology
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
Hitta via bibliotek
Till lärosätets databas