Neuroanatomical substrates for paroxysmal dyskinesia in lethargic mice.
The paroxysmal dyskinesias are a group of neurological disorders described by intermittent attacks of involuntary abnormal movements superimposed on a relatively normal baseline. The neuroanatomical substrates for these attacks are not fully understood, though available evidence from studies of affected people and animal models points to dysfunction in the basal ganglia or cerebellum. In the current studies, the anatomical basis for paroxysmal dyskinesias in lethargic mice was determined via histochemical methods sensitive to changes in regional brain activity followed by surgical elimination of the suspected source. Cytochrome oxidase histochemistry revealed increased activity in the red nucleus. Surgical removal of the cerebellum worsened ataxia but eliminated paroxysmal dyskinesias. These studies support the hypothesis that abnormal cerebellar output contributes to paroxysmal dyskinesias.
Devanagondi
Rajiv
R
Department of Neurology, Meyer Room 6-181, 600 North Wolfe Street, Johns Hopkins Hospital, Baltimore, MD 21287, and University of Tennessee, Memphis 38163, USA.
Egami
Kiyoshi
K
LeDoux
Mark S
MS
Hess
Ellen J
EJ
Jinnah
H A
HA
D000818:Animals; D001522:Behavior, Animal; D015220:Calcium Channels; D002531:Cerebellum / Q000503:physiopathology* / Q000601:surgery*; D002819:Chorea / Q000473:pathology* / Q000503:physiopathology*; D003576:Electron Transport Complex IV / Q000378:metabolism; D016762:Genes, fos / Q000502:physiology; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D051379:Mice; D008818:Mice, Neurologic Mutants; D012012:Red Nucleus / Q000473:pathology / Q000503:physiopathology
C491530:Cacnb4 protein, mouse; D015220:Calcium Channels; D003576:Electron Transport Complex IV