Glucocerebrosidase deficiency in dopaminergic neurons induces microglial activation without neurodegeneration. 2017

Federico N Soria, and Michel Engeln, and Marta Martinez-Vicente, and Christelle Glangetas, and María José López-González, and Sandra Dovero, and Benjamin Dehay, and Elisabeth Normand, and Miquel Vila, and Alexandre Favereaux, and François Georges, and Christophe Lo Bianco, and Erwan Bezard, and Pierre-Olivier Fernagut
UMR 5293, Institut des Maladies Neurodégénératives, Université de Bordeaux, 33076 Bordeaux, France.

Mutations in the GBA1 gene encoding the lysosomal enzyme glucocerebrosidase (GBA1) are important risk factors for Parkinson's disease (PD). In vitro, altered GBA1 activity promotes alpha-synuclein accumulation whereas elevated levels of alpha-synuclein compromise GBA1 function, thus supporting a pathogenic mechanism in PD. However, the mechanisms by which GBA1 deficiency is linked to increased risk of PD remain elusive, partially because of lack of aged models of GBA1 deficiency. As knocking-out GBA1 in the entire brain induces massive neurodegeneration and early death, we generated a mouse model of GBA1 deficiency amenable to investigate the long-term consequences of compromised GBA1 function in dopaminergic neurons. DAT-Cre and GBA1-floxed mice were bred to obtain selective homozygous disruption of GBA1 in midbrain dopamine neurons (DAT-GBA1-KO). Mice were followed for motor function, neuronal survival, alpha-synuclein phosphorylation and glial activation. Susceptibility to nigral viral vector-mediated overexpression of mutated (A53T) alpha-synuclein was assessed. Despite loss of GBA1 and substrate accumulation, DAT-GBA1-KO mice displayed normal motor performances and preserved dopaminergic neurons despite robust microglial activation in the substantia nigra, without accumulation of endogenous alpha-synuclein with respect to wild-type mice. Lysosomal function was only marginally affected. Screening of micro-RNAs linked to the regulation of GBA1, alpha-synuclein or neuroinflammation did not reveal significant alterations. Viral-mediated overexpression of A53T-alpha-synuclein yielded similar neurodegeneration in DAT-GBA1-KO mice and wild-type mice. These results indicate that loss of GBA1 function in mouse dopaminergic neurons is not critical for alpha-synuclein accumulation or neurodegeneration and suggest the involvement of GBA1 deficiency in other cell types as a potential mechanism.

UI MeSH Term Description Entries
D008636 Mesencephalon The middle of the three primitive cerebral vesicles of the embryonic brain. Without further subdivision, midbrain develops into a short, constricted portion connecting the PONS and the DIENCEPHALON. Midbrain contains two major parts, the dorsal TECTUM MESENCEPHALI and the ventral TEGMENTUM MESENCEPHALI, housing components of auditory, visual, and other sensorimoter systems. Midbrain,Mesencephalons,Midbrains
D010300 Parkinson Disease A progressive, degenerative neurologic disease characterized by a TREMOR that is maximal at rest, retropulsion (i.e. a tendency to fall backwards), rigidity, stooped posture, slowness of voluntary movements, and a masklike facial expression. Pathologic features include loss of melanin containing neurons in the substantia nigra and other pigmented nuclei of the brainstem. LEWY BODIES are present in the substantia nigra and locus coeruleus but may also be found in a related condition (LEWY BODY DISEASE, DIFFUSE) characterized by dementia in combination with varying degrees of parkinsonism. (Adams et al., Principles of Neurology, 6th ed, p1059, pp1067-75) Idiopathic Parkinson Disease,Lewy Body Parkinson Disease,Paralysis Agitans,Primary Parkinsonism,Idiopathic Parkinson's Disease,Lewy Body Parkinson's Disease,Parkinson Disease, Idiopathic,Parkinson's Disease,Parkinson's Disease, Idiopathic,Parkinson's Disease, Lewy Body,Parkinsonism, Primary
D001921 Brain The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM. Encephalon
D005776 Gaucher Disease An autosomal recessive disorder caused by a deficiency of acid beta-glucosidase (GLUCOSYLCERAMIDASE) leading to intralysosomal accumulation of glycosylceramide mainly in cells of the MONONUCLEAR PHAGOCYTE SYSTEM. The characteristic Gaucher cells, glycosphingolipid-filled HISTIOCYTES, displace normal cells in BONE MARROW and visceral organs causing skeletal deterioration, hepatosplenomegaly, and organ dysfunction. There are several subtypes based on the presence and severity of neurological involvement. Cerebroside Lipidosis Syndrome,Gaucher Disease Type 1,Gaucher Disease Type 2,Glucocerebrosidase Deficiency Disease,Glucosylceramide Beta-Glucosidase Deficiency Disease,Neuronopathic Gaucher Disease,Acid beta-Glucosidase Deficiency,Acid beta-Glucosidase Deficiency Disease,Acute Neuronopathic Gaucher Disease,Chronic Gaucher Disease,GBA Deficiency,Gaucher Disease Type 3,Gaucher Disease, Acute Neuronopathic,Gaucher Disease, Acute Neuronopathic Type,Gaucher Disease, Chronic,Gaucher Disease, Chronic Neuronopathic Type,Gaucher Disease, Infantile,Gaucher Disease, Infantile Cerebral,Gaucher Disease, Juvenile,Gaucher Disease, Juvenile and Adult, Cerebral,Gaucher Disease, Neuronopathic,Gaucher Disease, Non-Neuronopathic Form,Gaucher Disease, Noncerebral Juvenile,Gaucher Disease, Subacute Neuronopathic Form,Gaucher Disease, Subacute Neuronopathic Type,Gaucher Disease, Type 1,Gaucher Disease, Type 2,Gaucher Disease, Type 3,Gaucher Disease, Type I,Gaucher Disease, Type II,Gaucher Disease, Type III,Gaucher Splenomegaly,Gaucher Syndrome,Gaucher's Disease,Gauchers Disease,Glucocerebrosidase Deficiency,Glucocerebrosidosis,Glucosyl Cerebroside Lipidosis,Glucosylceramidase Deficiency,Glucosylceramide Beta-Glucosidase Deficiency,Glucosylceramide Lipidosis,Infantile Gaucher Disease,Kerasin Histiocytosis,Kerasin Lipoidosis,Kerasin thesaurismosis,Lipoid Histiocytosis (Kerasin Type),Non-Neuronopathic Gaucher Disease,Subacute Neuronopathic Gaucher Disease,Type 1 Gaucher Disease,Type 2 Gaucher Disease,Type 3 Gaucher Disease,Cerebroside Lipidoses, Glucosyl,Cerebroside Lipidosis Syndromes,Cerebroside Lipidosis, Glucosyl,Deficiencies, GBA,Deficiencies, Glucocerebrosidase,Deficiency Disease, Glucocerebrosidase,Deficiency Diseases, Glucocerebrosidase,Deficiency, GBA,Deficiency, Glucocerebrosidase,Disease, Chronic Gaucher,Disease, Gaucher,Disease, Gaucher's,Disease, Gauchers,Disease, Glucocerebrosidase Deficiency,Disease, Infantile Gaucher,Disease, Juvenile Gaucher,Disease, Neuronopathic Gaucher,Disease, Non-Neuronopathic Gaucher,Diseases, Gauchers,Diseases, Glucocerebrosidase Deficiency,GBA Deficiencies,Gaucher Disease, Non Neuronopathic Form,Gaucher Disease, Non-Neuronopathic,Gauchers Diseases,Glucocerebrosidase Deficiencies,Glucocerebrosidase Deficiency Diseases,Glucocerebrosidoses,Glucosyl Cerebroside Lipidoses,Glucosylceramide Lipidoses,Histiocytoses, Kerasin,Histiocytoses, Lipoid (Kerasin Type),Histiocytosis, Kerasin,Histiocytosis, Lipoid (Kerasin Type),Juvenile Gaucher Disease,Kerasin Histiocytoses,Kerasin Lipoidoses,Kerasin thesaurismoses,Lipidoses, Glucosyl Cerebroside,Lipidoses, Glucosylceramide,Lipidosis Syndrome, Cerebroside,Lipidosis Syndromes, Cerebroside,Lipidosis, Glucosyl Cerebroside,Lipidosis, Glucosylceramide,Lipoid Histiocytoses (Kerasin Type),Lipoidoses, Kerasin,Lipoidosis, Kerasin,Non Neuronopathic Gaucher Disease,Splenomegaly, Gaucher,Syndrome, Cerebroside Lipidosis,Syndrome, Gaucher,Syndromes, Cerebroside Lipidosis,thesaurismoses, Kerasin,thesaurismosis, Kerasin
D005822 Genetic Vectors DNA molecules capable of autonomous replication within a host cell and into which other DNA sequences can be inserted and thus amplified. Many are derived from PLASMIDS; BACTERIOPHAGES; or VIRUSES. They are used for transporting foreign genes into recipient cells. Genetic vectors possess a functional replicator site and contain GENETIC MARKERS to facilitate their selective recognition. Cloning Vectors,Shuttle Vectors,Vectors, Genetic,Cloning Vector,Genetic Vector,Shuttle Vector,Vector, Cloning,Vector, Genetic,Vector, Shuttle,Vectors, Cloning,Vectors, Shuttle
D005962 Glucosylceramidase A glycosidase that hydrolyzes a glucosylceramide to yield free ceramide plus glucose. Deficiency of this enzyme leads to abnormally high concentrations of glucosylceramide in the brain in GAUCHER DISEASE. EC 3.2.1.45. Glucocerebrosidase,Acid beta-Glucosidase,Glucocerebroside beta-Glucosidase,Glucosyl Ceramidase,Glucosylceramide beta-Glucosidase,Glucosylsphingosine Glucosyl Hydrolase,beta-Glucocerebrosidase,Acid beta Glucosidase,Ceramidase, Glucosyl,Glucocerebroside beta Glucosidase,Glucosyl Hydrolase, Glucosylsphingosine,Glucosylceramide beta Glucosidase,Hydrolase, Glucosylsphingosine Glucosyl,beta Glucocerebrosidase,beta-Glucosidase, Acid,beta-Glucosidase, Glucocerebroside,beta-Glucosidase, Glucosylceramide
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013378 Substantia Nigra The black substance in the ventral midbrain or the nucleus of cells containing the black substance. These cells produce DOPAMINE, an important neurotransmitter in regulation of the sensorimotor system and mood. The dark colored MELANIN is a by-product of dopamine synthesis. Nigra, Substantia,Nigras, Substantia,Substantia Nigras
D017628 Microglia The third type of glial cell, along with astrocytes and oligodendrocytes (which together form the macroglia). Microglia vary in appearance depending on developmental stage, functional state, and anatomical location; subtype terms include ramified, perivascular, ameboid, resting, and activated. Microglia clearly are capable of phagocytosis and play an important role in a wide spectrum of neuropathologies. They have also been suggested to act in several other roles including in secretion (e.g., of cytokines and neural growth factors), in immunological processing (e.g., antigen presentation), and in central nervous system development and remodeling. Microglial Cell,Cell, Microglial,Microglial Cells,Microglias
D051379 Mice The common name for the genus Mus. Mice, House,Mus,Mus musculus,Mice, Laboratory,Mouse,Mouse, House,Mouse, Laboratory,Mouse, Swiss,Mus domesticus,Mus musculus domesticus,Swiss Mice,House Mice,House Mouse,Laboratory Mice,Laboratory Mouse,Mice, Swiss,Swiss Mouse,domesticus, Mus musculus

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