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A proteomic study identifies different levels of light chain ferritin in corticobasal degeneration and progressive supranuclear palsy

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Abstract

Clinical and pathological evidence supports the notion that corticobasal degeneration (CBD) and progressive supranuclear palsy (PSP) are distinct, but overlapping neurodegenerative tauopathies. Although both disorders are characterized by abnormal accumulation of 4-repeat tau, they display distinct proteolytic profiles of tau species and they have distinct astrocytic lesions, astrocytic plaques in CBD and tufted astrocytes in PSP. To investigate other differences between these two disorders at the molecular level, we compared the profiles of proteins from caudate nucleus of CBD and PSP by quantitative two-dimensional difference gel electrophoresis. Twenty-one protein spots differentially expressed in CBD and PSP were dissected for mass spectrometry (MS). One of the spots was identified by MS to contain light chain (LC) ferritin. Western blot analysis verified the presence of LC ferritin in this spot and showed that this protein was two-fold higher in caudate of CBD than that of PSP samples. These results were confirmed by LC ferritin immunohistochemistry. Co-labeling of caudate nucleus with tau and LC ferritin antibodies showed the presence of LC ferritin immunoreactivity in astrocytic plaques of CBD, but minimal labeling of tufted astrocytes in PSP. This difference did not reflect the extent of gliosis. Analysis of other brain regions in CBD and PSP showed no difference in LC ferritin levels. Together the data suggest that LC ferritin is a unique marker of astrocytic lesions in CBD, adding further support to the notion that CBD and PSP are distinct clinicopathologic entities.

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Acknowledgments

We thank Mr. Benjamin Madden at Mayo Proteomic Research Center for assistance with mass spectrometric analyses. We also thank Linda Rousseau and Virginia Phillips for tissue processing. This study was supported by CurePSP/The Society for Progressive Supranuclear Palsy and by the Mayo Foundation for Education and Research.

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Correspondence to Daniel Sevlever.

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Ebrahim, A.S., Kulathingal, J., Murray, M.E. et al. A proteomic study identifies different levels of light chain ferritin in corticobasal degeneration and progressive supranuclear palsy. Acta Neuropathol 122, 727–736 (2011). https://doi.org/10.1007/s00401-011-0888-x

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  • DOI: https://doi.org/10.1007/s00401-011-0888-x

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