Neuronopathic Gaucher disease (nGD) is caused by deleterious mutations in GBA1/Gba1 and the resultant defective activity of acid ?-glucosidase (GCase). nGD is a prototype lysosomal storage disease (LSD) that displays generalized neuronal death in central nerve system (CNS). Effective therapeutic interventions have had major effects on the CNS manifestations of nGD due to i) the inability of GCase to cross the blood brain barrier (BBB), ii) the rapid denaturation of GCase at serum pH, and iii) the inability f the membrane associated GCase expressed at wild-type levels in cells to be secreted in sufficient amounts for metabolic cross- correction. We identified two receptor-binding peptides (Rp) from apolipoprotein E that can facilitate protein delivery across the BBB and into many CNS cell types via the low-density lipoprotein receptor superfamily (LDLRf). Also, we demonstrated the therapeutic potential with CNS metabolic correction and concordant normalization of neurological deficits in an enzyme-deficient LSD murine model after long-term hematopoietic stem cells (HSC)-mediated gene therapy using a lentiviral vector (LV). Importantly, we show that carboxy terminal addition of the myc-tag to GCase does not alter the enzyme's structure, activity or stability. Moreover, we showed for the first time that megakaryocytes are capable of over-producing lysosomal enzymes and packaging them into platelets for cross-correction of enzyme-deficient cells. Finally, we developed viable nGD mouse models that mimic acute and chronic human nGD. Based on these strong preliminary data and the great unmet medical need for CNS therapy in nGD, we will test the hypothesis that fusion of Rp to GCase will enable the modified GCase to transcytose into the CNS with wide CNS cell distribution via the LDLRf, so that synergistic CNS benefits can be achieved from continuous production of GCase-Rp through protective depots, i.e., platelets and macrophages. The overall goal of the project is to develop a novel therapeutic approach utilizing LDLRf-mediated transcytosis for protein delivery across the BBB via LV- mediated gene transfer into HSC with lineage-restricted expression in protective depots for the treatment of the CNS manifestations and essential correction of the visceral disease in nGD. We will assess various GCase-Rp for LDLRf-mediated CNS delivery, develop lineage-restricted expression systems for sustained and targeted protein generation via protective depots, and evaluate protein bio-distribution and therapeutic benefits in nGD mouse models. This project aims at a major unmet medical need for efficient BBB transcytosis systems with broad distribution of the therapeutic macromolecules to many CNS cell types for the treatment of a wide variety of CNS diseases. The approaches developed in the studies have general and significant applicability to neurodegenerative diseases including other LSDs, and Parkinson and Alzheimer diseases.

Public Health Relevance

A major unmet medical need is the development of efficient transcytosis systems for delivery of large therapeutic molecules (drugs) across the blood-brain barrier. Also, once within the brain these treatments require delivery to many brain cell types to be effective in wide variety of neurological diseases. The goal of this project is to develop such novel therapeutic strategies using mouse model disease systems that will have broad applicability to rare and common diseases, for example, neuronopathic Gaucher disease (rare disease) and Parkinson and Alzheimer diseases (common diseases). Success in the rare disease will provide the basis for extension to the more common diseases with novel new approaches for treatment.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS086134-03
Application #
8860258
Study Section
Therapeutic Approaches to Genetic Diseases Study Section (TAG)
Program Officer
Morris, Jill A
Project Start
2013-09-01
Project End
2016-05-31
Budget Start
2015-06-01
Budget End
2016-05-31
Support Year
3
Fiscal Year
2015
Total Cost
Indirect Cost
Name
Cincinnati Children's Hospital Medical Center
Department
Type
DUNS #
071284913
City
Cincinnati
State
OH
Country
United States
Zip Code
45229
Han, Jing-Fen; El-Amouri, Salim S; Dai, Mei et al. (2018) Getting the Most: Enhancing Efficacy by Promoting Erythropoiesis and Thrombopoiesis after Gene Therapy in Mice with Hurler Syndrome. Mol Ther Methods Clin Dev 11:52-64
Dai, Mei; Lin, Yi; El-Amouri, Salim S et al. (2018) Comprehensive evaluation of blood-brain barrier-forming micro-vasculatures: Reference and marker genes with cellular composition. PLoS One 13:e0197379
Dai, Mei; Liou, Benjamin; Swope, Brittany et al. (2016) Progression of Behavioral and CNS Deficits in a Viable Murine Model of Chronic Neuronopathic Gaucher Disease. PLoS One 11:e0162367
Liou, Benjamin; Peng, Yanyan; Li, Ronghua et al. (2016) Modulating ryanodine receptors with dantrolene attenuates neuronopathic phenotype in Gaucher disease mice. Hum Mol Genet 25:5126-5141
Hu, Peirong; Li, Yedda; Nikolaishvili-Feinberg, Nana et al. (2016) Hematopoietic Stem cell transplantation and lentiviral vector-based gene therapy for Krabbe's disease: Present convictions and future prospects. J Neurosci Res 94:1152-68
Wang, Xuefeng; Shin, Simon C; Chiang, Andy F J et al. (2015) Intraosseous delivery of lentiviral vectors targeting factor VIII expression in platelets corrects murine hemophilia A. Mol Ther 23:617-26
Dasgupta, Nupur; Xu, You-Hai; Li, Ronghua et al. (2015) Neuronopathic Gaucher disease: dysregulated mRNAs and miRNAs in brain pathogenesis and effects of pharmacologic chaperone treatment in a mouse model. Hum Mol Genet 24:7031-48
El-Amouri, Salim S; Dai, Mei; Han, Jing-Fen et al. (2014) Normalization and improvement of CNS deficits in mice with Hurler syndrome after long-term peripheral delivery of BBB-targeted iduronidase. Mol Ther 22:2028-37
Dai, Mei; Han, Jingfen; El-Amouri, Salim S et al. (2014) Platelets are efficient and protective depots for storage, distribution, and delivery of lysosomal enzyme in mice with Hurler syndrome. Proc Natl Acad Sci U S A 111:2680-5