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Striatal tissue transplantation in non-human primates
A L Kendall1, P Hantraye, S Palfi
1Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, UK. alk1001@cam.ac.uk
Progress in Brain Research
|January 6, 2001
Summary
Striatal grafts in primate models partially restore motor function and reduce dyskinesias by re-establishing cortico-striatal circuitry. Graft integration with the host globus pallidus is crucial for functional recovery in movement disorders.
Area of Science:
- Neuroscience
- Primate Models
- Neurodegenerative Diseases
Background:
- The basal ganglia, including the caudate nucleus and putamen, form critical cortico-striatal-thalamic loops for motor and cognitive functions.
- Medium spiny GABAergic neurons are primarily affected in Huntington's disease (HD), necessitating functional restoration of striatal circuitry.
- Rodent studies show potential for striatal grafts but primate models are essential due to complex behavioral repertoires and differentiated striatum.
Purpose of the Study:
- To investigate the functional integration and recovery potential of striatal grafts in primate models with induced motor impairments.
- To explore the restoration of cortico-striatal-thalamic circuitry following striatal transplantation.
- To assess the impact of graft placement and connectivity on motor function and dyskinesia reduction.
Main Methods:
- Anatomical tracing studies to map corticostriatal projections in primates.
- Induction of unilateral putamen lesions in marmosets to study motor deficits.
- Implantation of striatal allografts and xenografts in primates with caudate and putamen lesions.
- Assessment of motor performance and apomorphine-induced dyskinesias post-transplantation.
Main Results:
- Striatal grafts in marmosets ameliorated motor impairments following putamen lesions, with evidence of host-graft cortico-striatal connectivity.
- Allografts and xenografts in larger primates reduced apomorphine-induced dyskinesias after caudate and putamen lesions.
- Close proximity of the graft to the globus pallidus correlated with better functional recovery in rodent and marmoset models.
Conclusions:
- Striatal tissue transplantation can partially restore motor function and reduce dyskinesias in primate models.
- Successful integration and functional restoration of the cortico-striatal-thalamic circuitry are key to graft efficacy.
- Further research is needed to fully substantiate the relationship between graft placement and functional recovery in primate models.