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2015 ; 9
(ä): 31
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Subthalamic deep brain stimulation reduces pathological information transmission
to the thalamus in a rat model of parkinsonism
#MMPMID26217192
Anderson CJ
; Sheppard DT
; Huynh R
; Anderson DN
; Polar CA
; Dorval AD
Front Neural Circuits
2015[]; 9
(ä): 31
PMID26217192
show ga
The degeneration of dopaminergic neurons in the substantia nigra pars compacta
leads to parkinsonian motor symptoms via changes in electrophysiological activity
throughout the basal ganglia. High-frequency deep brain stimulation (DBS)
partially treats these symptoms, but the mechanisms are unclear. We hypothesize
that motor symptoms of Parkinson's disease (PD) are associated with increased
information transmission from basal ganglia output neurons to motor thalamus
input neurons and that therapeutic DBS of the subthalamic nucleus (STN) treats
these symptoms by reducing this extraneous information transmission. We tested
these hypotheses in a unilateral, 6-hydroxydopamine-lesioned rodent model of
hemiparkinsonism. Information transfer between basal ganglia output neurons and
motor thalamus input neurons increased in both the orthodromic and antidromic
directions with hemiparkinsonian (hPD) onset, and these changes were reversed by
behaviorally therapeutic STN-DBS. Omnidirectional information increases in the
parkinsonian state underscore the detrimental nature of that pathological
information and suggest a loss of information channel independence. Therapeutic
STN-DBS reduced that pathological information, suggesting an effective increase
in the number of independent information channels. We interpret these data with a
model in which pathological information and fewer information channels diminishes
the scope of possible motor activities, driving parkinsonian symptoms. In this
model, STN-DBS restores information-channel independence by eliminating or
masking the parkinsonism-associated information, and thus enlarges the scope of
possible motor activities, alleviating parkinsonian symptoms.