Abstract:
:BACKGROUND: Twitcher mouse (twi/twi) is an authentic murine model of Krabbe's disease. Accumulation of psychosine, resulting in apoptosis of oligodendrocytes and subsequent demyelination, is a cardinal event to the pathogenesis of this disease. Moreover, recruitment of inflammatory cells plays a significant role in the pathological process in the twi/twi central and peripheral nervous systems. In this study, we investigated the 1) the relationship between tumor necrosis factor-alpha (TNFalpha), pro-inflammatory cytokine, and the progression of this disease and 2) effect of the anti-inflammatory therapy by ibudilast, a phosphodiesterase inhibitor. METHODS: We quantified the expression level of TNFalpha and TNF-receptor mRNA in twi/twi using semi-quantitative RT-PCR. The relationship between TNFalpha expression, apoptosis of oligodendrocytes and demyelination was studied with immunohistochemistry and TUNEL method. We then treated twi/twi with a daily intraperitoneal injection of ibudilast (10 mg/kg), which suppress TNFalpha production in the brain. RESULTS: We found that TNFalpha-immunoreactive microglia/macrophages appeared in the twi/twi brain and that the mRNA levels of TNFalpha and TNF-receptor 1 was increased with the progression of demyelination. The distribution profile of TNFalpha-immunoreactive microglia/macrophages overlapped that of TUNEL-positive oligodendrocytes in the twi/twi brain. When twi/twi was treated with ibudilast from PND30, the number of oligodendrocytes undergoing apoptosis was markedly reduced and demyelination was milder. Obvious improvement of clinical symptom was noted in two of five. The failure of constant clinical improvement by ibudilast may result from hepatotoxicity and/or the inhibition of proliferation of NG2-positive oligodendrocyte precursors. CONCLUSION: We conclude that anti-inflammatory therapy by a phosphodiesterase inhibitor can be considered as a novel alternative therapy for Krabbe's disease.
journal_name
J Neuroinflammationjournal_title
Journal of neuroinflammationauthors
Kagitani-Shimono K,Mohri I,Fujitani Y,Suzuki K,Ozono K,Urade Y,Taniike Mdoi
10.1186/1742-2094-2-10subject
Has Abstractpub_date
2005-04-06 00:00:00pages
10issue
1issn
1742-2094pii
1742-2094-2-10journal_volume
2pub_type
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