TY - JOUR
T1 - Alterations in striatal dopamine catabolism precede loss of substantia nigra neurons in a mouse model of juvenile neuronal ceroid lipofuscinosis
AU - Weimer, Jill M.
AU - Benedict, Jared W.
AU - Elshatory, Yasser M.
AU - Short, Douglas W.
AU - Ramirez-Montealegre, Denia
AU - Ryan, Deborah A.
AU - Alexander, Noreen A.
AU - Federoff, Howard J.
AU - Cooper, Jonathan D.
AU - Pearce, David A.
N1 - Funding Information:
The authors wish to thank Charlie Pontikis for assistance in analysis of stereology data; and Timothy Curran, Andrew Serour, and Sarah Leistman for technical assistance. This work was funded in part by National Institutes of Health (NIH) NS40580 and NS44310 (DAP), NS41930 (JDC), student fellowships NIH T32 MH065181 (JMW), NIH T32 ES07026 (DWS), Batten Disease Support and Research Association (JMW, JWB), The Luke and Rachel Foundation (DMR) and NIH R25 GMO64113 (YME).
PY - 2007/8/8
Y1 - 2007/8/8
N2 - Batten disease, or juvenile neuronal ceroid lipofuscinosis (JNCL), results from mutations in the CLN3 gene. This disorder presents clinically around the age of 5 years with visual deficits progressing to include seizures, cognitive impairment, motor deterioration, hallucinations, and premature death by the third to fourth decade of life. The motor deficits include coordination and gait abnormalities, myoclonic jerks, inability to initiate movements, and spasticity. Previous work from our laboratory has identified an early reduction in catechol-O-methyltransferase (COMT), an enzyme responsible for the efficient degradation of dopamine. Alterations in the kinetics of dopamine metabolism could cause the accumulation of undegraded or unsequestered dopamine leading to the formation of toxic dopamine intermediates. We report an imbalance in the catabolism of dopamine in 3 month Cln3-/- mice persisting through 9 months of age that may be causal to oxidative damage within the striatum at 9 months of age. Combined with the previously reported inflammatory changes and loss of post-synaptic D1α receptors, this could facilitate cell loss in striatal projection regions and underlie a general locomotion deficit that becomes apparent at 12 months of age in Cln3-/- mice. This study provides evidence for early changes in the kinetics of COMT in the Cln3-/- mouse striatum, affecting the turnover of dopamine, likely leading to neuron loss and motor deficits. These data provide novel insights into the basis of motor deficits in JNCL and how alterations in dopamine catabolism may result in oxidative damage and localized neuronal loss in this disorder.
AB - Batten disease, or juvenile neuronal ceroid lipofuscinosis (JNCL), results from mutations in the CLN3 gene. This disorder presents clinically around the age of 5 years with visual deficits progressing to include seizures, cognitive impairment, motor deterioration, hallucinations, and premature death by the third to fourth decade of life. The motor deficits include coordination and gait abnormalities, myoclonic jerks, inability to initiate movements, and spasticity. Previous work from our laboratory has identified an early reduction in catechol-O-methyltransferase (COMT), an enzyme responsible for the efficient degradation of dopamine. Alterations in the kinetics of dopamine metabolism could cause the accumulation of undegraded or unsequestered dopamine leading to the formation of toxic dopamine intermediates. We report an imbalance in the catabolism of dopamine in 3 month Cln3-/- mice persisting through 9 months of age that may be causal to oxidative damage within the striatum at 9 months of age. Combined with the previously reported inflammatory changes and loss of post-synaptic D1α receptors, this could facilitate cell loss in striatal projection regions and underlie a general locomotion deficit that becomes apparent at 12 months of age in Cln3-/- mice. This study provides evidence for early changes in the kinetics of COMT in the Cln3-/- mouse striatum, affecting the turnover of dopamine, likely leading to neuron loss and motor deficits. These data provide novel insights into the basis of motor deficits in JNCL and how alterations in dopamine catabolism may result in oxidative damage and localized neuronal loss in this disorder.
KW - Batten disease
KW - CLN3
KW - Catechol-O-methyltransferase
KW - Dopamine
KW - Oxidative stress
UR - http://www.scopus.com/inward/record.url?scp=34447634680&partnerID=8YFLogxK
U2 - 10.1016/j.brainres.2007.05.018
DO - 10.1016/j.brainres.2007.05.018
M3 - Article
C2 - 17617387
AN - SCOPUS:34447634680
SN - 0006-8993
VL - 1162
SP - 98
EP - 112
JO - Brain Research
JF - Brain Research
IS - 1
ER -