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Arch Neurol. 2010 Oct;67(10):1238-50. doi: 10.1001/archneurol.2010.254.

Pathological 43-kDa transactivation response DNA-binding protein in older adults with and without severe mental illness.

Author information

  • 1Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-4283, USA.

Abstract

BACKGROUND:

Major psychiatric diseases such as schizophrenia and mood disorders have not been linked to a specific pathology, but their clinical features overlap with some aspects of the behavioral variant of frontotemporal lobar degeneration. Although the significance of pathological 43-kDa (transactivation response) DNA-binding protein (TDP-43) for frontotemporal lobar degeneration was appreciated only recently, the prevalence of TDP-43 pathology in patients with severe mental illness vs controls has not been systematically addressed.

OBJECTIVE:

To examine patients with chronic psychiatric diseases, mainly schizophrenia, for evidence of neurodegenerative TDP-43 pathology in comparison with controls.

DESIGN:

Prospective longitudinal clinical evaluation and retrospective medical record review, immunohistochemical identification of pathological TDP-43 in the central nervous system, and genotyping for gene alterations known to cause TDP-43 proteinopathies including the TDP-43 (TARDBP) and progranulin (GRN) genes.

SETTING:

University health system.

PARTICIPANTS:

One hundred fifty-one subjects including 91 patients with severe mental illness (mainly schizophrenia) and 60 controls.

MAIN OUTCOME MEASURES:

Clinical medical record review, neuronal and glial TDP-43 pathology, and TARDP and GRN genotyping status.

RESULTS:

Significant TDP-43 pathology in the amygdala/periamygdaloid region or the hippocampus/transentorhinal cortex was absent in both groups in subjects younger than 65 years but present in elderly subjects (29% [25 of 86] of the psychiatric patients and 29% [10 of 34] of control subjects). Twenty-three percent (8 of 35) of the positive cases showed significant TDP-43 pathology in extended brain scans. There were no evident differences between the 2 groups in the frequency, degree, or morphological pattern of TDP-43 pathology. The latter included (1) subpial and subependymal, (2) focal, or (3) diffuse lesions in deep brain parenchyma and (4) perivascular pathology. A new GRN variant of unknown significance (c.620T>C, p.Met207Thr) was found in 1 patient with schizophrenia with TDP-43 pathology. No known TARDBP mutations or other variants were found in any of the subjects studied herein.

CONCLUSIONS:

The similar findings of TDP-43 pathology in elderly patients with severe mental illness and controls suggest common age-dependent TDP-43 changes in limbic brain areas that may signify that these regions are affected early in the course of a cerebral TDP-43 multisystem proteinopathy. Finally, our data provide an age-related baseline for the development of whole-brain pathological TDP-43 evolution schemata.

PMID:
20937952
[PubMed - indexed for MEDLINE]
PMCID:
PMC3050578
Free PMC Article

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