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Evaluation of subcortical pathology and clinical correlations in FTLD-U subtypes

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Abstract

Frontotemporal lobar degeneration (FTLD) can be classified as tau-positive (FTLD-tau) and tau-negative FTLD. The most common form of tau-negative FTLD is associated with neuronal inclusions that are composed of TAR DNA-binding protein 43 (TDP-43) (FTLD-TDP). Recent evidence suggests that FTLD-TDP can be further subdivided into at least three major histologic variants based on patterns of TDP-43 immunoreactive neuronal cytoplasmic inclusions (NCI) and dystrophic neurites (DN) in neocortex and hippocampus. The aim of this study was to extend the histologic analysis to other brain regions and to determine if there were distinct clinical and pathologic characteristics of the FTLD-TDP subtypes. Thirty-nine FTLD-TDP cases were analyzed (Mackenzie type 1 n = 24, Mackenzie type 2 n = 9, Mackenzie type 3 n = 6). There was a highly significant association between clinical syndrome and FTLD-TDP subtype, with progressive non-fluent aphasia associated with type 1, semantic dementia with type 2, and behavioral variant frontotemporal dementia with types 1, 2 and 3. Semi-quantitative analysis of NCI and DN demonstrated different patterns of involvement in cortical, subcortical and brainstem areas that were characteristic for each of the three types of FTLD-TDP. Type 1 had a mixture of NCI and DN, as well as intranuclear inclusions in most cases and TDP-43 pathology at all levels of the neuraxis, but less in brainstem than supratentorial structures. Type 2 cases were characterized by predominance of long, thick DN in the cortex, as well as numerous NCI in hippocampus, amygdala and basal ganglia, but virtually no NCI and only sparse DN in diencephalon and brainstem. Type 3 had a paucity of DN at all levels of the neuraxis and significantly more NCI in the hypoglossal nucleus than the other types. These findings extend previously described clinicopathological associations of FTLD-TDP subtypes and support the notion that FTLD-TDP subtypes may be distinct clinicopathologic disorders.

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Acknowledgments

K. A. J. is supported by the NIH Roadmap Multidisciplinary Clinical Research Career Development Award Grant (K12/NICHHD)-HD49078. D. W. D. is supported by NIH grants: P50AG025711, P01AG017216, P01AG03949 and P50NS40256. Some of the cases used in this study were derived from the State of Florida Alzheimer Disease Initiative brain bank, which is funded by the State of Florida Department of Elder Affairs, while others came from the Society for Progressive Supranuclear Palsy brain bank. We acknowledge the contribution of the many clinicians in the Mayo Clinic and referring centers for their evaluations of the patients in this study and the families who gave permission for postmortem studies to elucidate the cause, treatment and prevention of these disorders. We acknowledge the histological assistance of Virginia Phillips, Linda Rousseau and Monica Casey-Castanedes. Genetic analyses were performed by Matthew Baker; Rosa Rademakers, Justus Dachsel and Matthew Farrer on some of the cases, as part of ongoing studies of FTLD and parkinsonism.

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Authors and Affiliations

  1. Department of Neurology, Mayo Clinic, Rochester, MN, USA

    Keith A. Josephs

  2. Department of Neuroscience, Mayo Clinic, 4500 San Pablo Road, Jacksonville, FL, 32226, USA

    Alex Stroh, Brittany Dugger & Dennis W. Dickson

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  1. Keith A. Josephs
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Correspondence to Dennis W. Dickson.

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Josephs, K.A., Stroh, A., Dugger, B. et al. Evaluation of subcortical pathology and clinical correlations in FTLD-U subtypes. Acta Neuropathol 118, 349–358 (2009). https://doi.org/10.1007/s00401-009-0547-7

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