title: Intraventricular enzyme replacement improves disease phenotypes in a mouse model of late infantile neuronal ceroid lipofuscinosis.
abstract: Late infantile neuronal ceroid lipofuscinosis (LINCL) is an autosomal recessive neurodegenerative disease caused by mutations in CLN2, which encodes the lysosomal protease tripeptidyl peptidase 1 (TPP1). LINCL is characterized clinically by progressive motor and cognitive decline, and premature death. Enzyme-replacement therapy (ERT) is currently available for lysosomal storage diseases affecting peripheral tissues, but has not been used in patients with central nervous system (CNS) involvement. Enzyme delivery through the cerebrospinal fluid is a potential alternative route to the CNS, but has not been studied for LINCL. In this study, we identified relevant neuropathological and behavioral hallmarks of disease in a mouse model of LINCL and correlated those findings with tissues from LINCL patients. Subsequently, we tested if intraventricular delivery of TPP1 to the LINCL mouse was efficacious. We found that infusion of recombinant human TPP1 through an intraventricular cannula led to enzyme distribution in several regions of the brain of treated mice. In vitro activity assays confirm increased TPP1 activity throughout the rostral-caudal extent of the brain. Importantly, treated mice showed attenuated neuropathology, and decreased resting tremor relative to vehicle-treated mice. This data demonstrates that intraventricular enzyme delivery to the CNS is feasible and may be of therapeutic value.
authors: Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, Iowa 52242, USA.
authors: Michael
authors: M
authors: Chang
authors: Jonathan D
authors: JD
authors: Cooper
authors: David E
authors: DE
authors: Sleat
authors: Seng H
authors: SH
authors: Cheng
authors: James C
authors: JC
authors: Dodge
authors: Marco A
authors: MA
authors: Passini
authors: Peter
authors: P
authors: Lobel
authors: Beverly L
authors: BL
authors: Davidson
mesh_terms: D000328:Adult; D000626:Aminopeptidases; D000818:Animals; D001253:Astrocytes / Q000378:metabolism; D001921:Brain / Q000201:enzymology / Q000473:pathology; D002552:Cerebral Ventricles; D002648:Child; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases; D004195:Disease Models, Animal; D010450:Endopeptidases / Q000235:genetics / Q000378:metabolism / Q000627:therapeutic use*; D005904:Glial Fibrillary Acidic Protein / Q000378:metabolism; D006801:Humans; D007223:Infant; D051379:Mice; D018345:Mice, Knockout; D009472:Neuronal Ceroid-Lipofuscinoses / Q000473:pathology / Q000503:physiopathology / Q000628:therapy*; D009474:Neurons / Q000378:metabolism; D010641:Phenotype; D011689:Purkinje Cells / Q000378:metabolism / Q000473:pathology; D011994:Recombinant Proteins / Q000627:therapeutic use; D057057:Serine Proteases; D000091346:Tripeptidyl-Peptidase 1
chemical_list: D005904:Glial Fibrillary Acidic Protein; D011994:Recombinant Proteins; C000717268:Tpp1 protein, mouse; D000091346:Tripeptidyl-Peptidase 1; D010450:Endopeptidases; D057057:Serine Proteases; D000626:Aminopeptidases; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases; C000717267:TPP1 protein, human