title: Different early ER-stress responses in the CLN8(mnd) mouse model of neuronal ceroid lipofuscinosis.
abstract: Neuronal ceroid lipofuscinoses (NCLs) are a group of inherited neurodegenerative disorders characterized by epilepsy, progressive motor and cognitive decline, blindness, and by the accumulation of autofluorescent lipopigment. Late-infantile onset forms (LINCL) include those linked to mutations in CLN8 gene, encoding a transmembrane protein at the endoplasmic reticulum (ER). In the motor neuron degeneration (mnd) mouse model of the CLN8-LINCL (CLN8(mnd)), we carried out an analysis of ER stress-related molecules in CNS structures that exhibit a variable rate of disease progression (early retinal degeneration and delayed brain and motoneuron dysfunction). At the presymptomatic state of 1-month-old CLN8(mnd) mice, we found an upregulation of GRP78 and activation of the transcription factor-6 (ATF6) in all structures examined, an activation of a CHOP-dependent pathway in the cerebellum, hippocampus and retina, a caspase-12-dependent pathway in the retina and no activation of these two pathways in the cerebral cortex and spinal cord. An increased CHOP expression was detected in the cortex and spinal cord at the early symptomatic state (4 months). Caspase-3 cleavage occurred presymptomatically in the cerebellum, hippocampus and retina, and symptomatically in the cerebral cortex and spinal cord. We also monitored activation of NF-κB, which is engaged in the alarming phase of ER stress, together with increased levels of TRAF2, TNF-α and TNFR1, and no activation of ASK-1/JNK signalling pathway, all over mnd structures. The results suggest that early ER-stress responses distinctly combined and ER-stress pathways integrated with inflammatory responses may contribute to the progression of the CLN8(mnd) disease in CNS structures.
authors.affiliation: CNR Institute of Biomedicine and Molecular Immunology, Neuroscience Unit, Via Ugo La Malfa 153, 90146 Palermo, Italy.
authors.forename: Giacoma
authors.initials: G
authors.lastname: Galizzi
authors.forename: Domenica
authors.initials: D
authors.lastname: Russo
authors.forename: Irene
authors.initials: I
authors.lastname: Deidda
authors.forename: Caterina
authors.initials: C
authors.lastname: Cascio
authors.forename: Rosa
authors.initials: R
authors.lastname: Passantino
authors.forename: Rosetta
authors.initials: R
authors.lastname: Guarneri
authors.forename: Paolo
authors.initials: P
authors.lastname: Bigini
authors.forename: Tiziana
authors.initials: T
authors.lastname: Mennini
authors.forename: Gaspare
authors.initials: G
authors.lastname: Drago
authors.forename: Patrizia
authors.initials: P
authors.lastname: Guarneri
mesh_terms: D000818:Animals; D015153:Blotting, Western; D002490:Central Nervous System / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology*; D004195:Disease Models, Animal; D004721:Endoplasmic Reticulum / Q000502:physiology*; D000091342:Endoplasmic Reticulum Chaperone BiP; D020869:Gene Expression Profiling; D007150:Immunohistochemistry; D007249:Inflammation / Q000473:pathology / Q000503:physiopathology; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D009472:Neuronal Ceroid-Lipofuscinoses / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology*; D015398:Signal Transduction / Q000502:physiology*; D013312:Stress, Physiological
chemical_list: C498493:Cln8 protein, mouse; D000091342:Endoplasmic Reticulum Chaperone BiP; C000717248:Hspa5 protein, mouse; D008565:Membrane Proteins