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Tri ethyl tin does not induce intra myelinic vacuoles in the central nervous system of the quaking mouse


, : Tri ethyl tin does not induce intra myelinic vacuoles in the central nervous system of the quaking mouse. Brain Research 225(2): 413-420

Triethyl tin (TET), when injected i.p., failed to produce the typical intramyelinic edema in the spinal cord of quaking mice with 2 different genetic backgrounds (B6C3H-qk and BTBRTF/Nev-qk), while control littermates and normal C57BL/6J mice were susceptible, as expected. The only prominent change in the quaking mice was the presence of spherical vacuoles containing floccular electron-dense materials, some of which were clearly within the oligodendroglial perikarya and the inner and outer tongues. They likely represented degenerative responses. Consistent with the lack of edema, no increase in water content was found in the quaking spinal cord following TET injection. Although the presence of numerous interlamellar tight junctions in quaking CNS myelin may mechanically restrict formation of the intralamellar vacuoles, the unique changes in the oligodendroglia and the lack of edema fluid accumulation suggested more fundamental metabolic abnormality that rendered the quaking CNS resistant to the triethyl tin-induced edema.

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