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Characterization of a progressive neurodegenerative disease induced by a temperature-sensitive Moloney murine
Abstract:
A progressive neurodegenerative disease occurred following infection of mice with a temperature-sensitive (ts) isolate of Moloney (Mo) murine leukemia virus (MuLV), ts Mo BA-1 MuLV. This NB-tropic ecotropic MuLV, which was ts for a late function, induced a syndrome of tremor, weakness of the hind limbs, and spasticity following infection of several strains of laboratory neonatal mice, including NFS, C3H/He, CBA, SJL, and BALB/c. The latent period of 8 to 16 weeks was considerably longer than that observed for the acute paralytic diseases observed following neonatal infection with other ts Mo-MuLV, rat-passaged Friend MuLV, and some wild mouse ecotropic MuLVs. Spongiform pathology without inflammation and degeneration of neurons devoid of budding virions occurred in the cerebellar grey matter, brain stem, and upper spinal cord; but lower spinal cord anterior horn cells were less obviously affected than in other MuLV-associated neuroparalytic syndromes. ts Mo BA-1 MuLV differed from other ts Mo-MuLV mutants that are capable of inducing a neuroparalytic syndrome in that while infected nervous system tissue contained high levels of MuLV p30 and gp70, no evidence of precursor accumulation or abnormal processing of MuLV p30 or gp70 could be demonstrated. The localization of virus within the nervous system suggests that direct neuronal infection may not be the etiologic mechanism in this MuLV-induced neurodegenerative disease.
Insights
A novel temperature-sensitive Moloney murine leukemia virus (MuLV) caused progressive neurodegeneration in mice, distinct from other MuLV strains. This research explores the unique pathology and viral mechanisms behind this neurological disease.
Area of Science:
- Neuroscience
- Virology
- Immunology
Background:
- Murine leukemia viruses (MuLVs) can cause neurodegenerative diseases in mice.
- Temperature-sensitive (ts) MuLV isolates offer unique tools to study viral pathogenesis.
- Understanding MuLV neurodegeneration is crucial for identifying disease mechanisms.
Purpose of the Study:
- To characterize the neurodegenerative disease induced by ts Mo BA-1 MuLV.
- To investigate the viral and cellular mechanisms underlying this specific MuLV-induced neurodegeneration.
- To compare the pathogenesis of ts Mo BA-1 MuLV with other neurotropic MuLV strains.
Main Methods:
- Infection of neonatal mice with ts Mo BA-1 MuLV.
- Clinical observation and pathological analysis of the central nervous system.
- Analysis of viral protein (p30, gp70) processing and localization.
Main Results:
- ts Mo BA-1 MuLV induced a progressive neurodegenerative syndrome with tremor, weakness, and spasticity in multiple mouse strains.
- Spongiform pathology without inflammation was observed in the cerebellum, brain stem, and upper spinal cord.
- Despite high viral protein levels, no evidence of precursor accumulation or abnormal processing of MuLV p30 or gp70 was found.
Conclusions:
- ts Mo BA-1 MuLV causes a distinct, late-onset neurodegenerative disease in mice.
- The pathogenesis may not involve direct neuronal infection or typical viral protein processing defects.
- Further research is needed to elucidate the precise etiologic mechanism of this MuLV-induced neurodegeneration.