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The twitcher mouse. Central nervous system pathology after bone marrow transplantation
K Suzuki1, P M Hoogerbrugge, B J Poorthuis
1Department of Pathology, University of North Carolina, Chapel Hill.
Summary
Bone marrow transplantation (BMT) in twitcher mice models of globoid cell leukodystrophy (GLD) showed improved central nervous system pathology. Donor-derived macrophages aided remyelination, but the enzymatic defect in oligodendrocytes persisted.
Area of Science:
- Neuroscience
- Genetics
- Cell Biology
Background:
- Globoid cell leukodystrophy (GLD), or Krabbe disease, is a fatal inherited lysosomal storage disorder.
- The homozygous twitcher mouse (twi/twi) serves as a valuable animal model for studying GLD pathology and therapeutic interventions.
- Oligodendrocyte dysfunction and myelin breakdown characterize GLD, leading to severe neurological deficits.
Purpose of the Study:
- To evaluate the therapeutic efficacy of bone marrow transplantation (BMT) on central nervous system (CNS) pathology in the twitcher mouse model of GLD.
- To investigate the cellular origins and functional contributions of macrophages following BMT in the context of GLD.
- To assess the long-term impact of BMT on myelin integrity and remyelination in the GLD mouse model.
Main Methods:
- Light and electron microscopy were employed to examine CNS tissues from BMT-treated twitcher mice at various time points post-transplantation.
- Histopathological analysis focused on oligodendrocytes, myelin sheaths, and the presence of GLD-characteristic inclusions within cellular compartments.
- Cellular origins of macrophages were inferred based on their morphology and the presence of enzymatic activity.
Main Results:
- BMT led to significant amelioration of CNS pathology in twitcher mice surviving over 100 days post-transplantation.
- Foamy macrophages, presumed to be of donor origin, were abundant and associated with myelin debris clearance and remyelination.
- Despite improvements, GLD inclusions persisted in oligodendrocytes, indicating incomplete correction of the underlying enzymatic defect.
Conclusions:
- BMT can partially correct the CNS pathology in GLD by supplying functional galactosylceramidase via donor-derived macrophages, promoting remyelination.
- The persistence of inclusions in oligodendrocytes suggests that BMT alone may not fully resolve the primary cellular defect in GLD.
- These findings highlight the potential of BMT as a supportive therapy for GLD, emphasizing the crucial role of macrophage engraftment and enzyme replacement.