Vol. 11 nº 3 - Jul/Aug/Set de 2017
Original Article Páginas: 249 a 254

Distinct Phospho-TDP-43 brain distribution in two cases of FTD, one associated with ALS

Authors Álvaro C.B. Guedes1; Ricardo Santin1; André S.R. Costa1; Keli C. Reiter2; Arlete Hilbig3; Liana L. Fernandez3


keywords: TDP-43, frontotemporal dementia, amyotrophic lateral sclerosis, neuropathology.

INTRODUCTION: TDP-43 is an intranuclear protein involved in many cellular processes. When altered, it shows a change in pattern of distribution, as well as in functioning, throughout the Central Nervous System structures. Frontotemporal Lobar Degeneration (FTLD) and Amyotrophic Lateral Sclerosis (ALS) are examples of TDP-43 proteinopathy. These disorders form a clinical spectrum, with some patients having a pure cognitive disorder while others also exhibit motor features.
METHODS: We studied two donated brains from patients with a diagnosis of Frontotemporal Dementia (FTD), one of which was associated with ALS (ALS-FTD). After fixation and macroscopic examinations, sample analyses were performed. Specific regions were chosen for the application of immunohistochemistry (IHC) with anti-Aβ, AT8, anti-α-synuclein and anti-phospho-TDP-43.
RESULTS: Both brains presented anti-phospho-TDP-43 positivity, but this was not equally distributed throughout the encephalic zones. In the FTD case, the studied brain presented phosphorylated TDP-43- in the frontal cortex, hippocampus, entorhinal cortex and mesencephalon; in the ALS-FTD case, the abnormal protein was also seen in the pons and medulla oblongata. The brain in the ALS-FTD case presented Aβ and AT8 positivity in the hippocampus and entorhinal cortex (Braak I and II).
DISCUSSION: The hypothesis supported by scientific literature that these neurodegenerative diseases can have the same etiology with distinct encephalic region involvement is corroborated by the present study.


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