Artículo
Histopathological and molecular heterogeneity among individuals with dementia associated with Presenilin mutations
Maarouf, Chera L.; Daugs, Ian D.; Spina, Salvatore; Vidal, Ruben; Kokjohn, Tyler A.; Patton, R. Lyle; Kalback, Walter M.; Luehrs, Dean C.; Walker, Douglas G.; Castaño, Eduardo Miguel
; Beach, Thomas G.; Ghetti, Bernardino; Roher, Alex E.
Fecha de publicación:
11/2008
Editorial:
BioMed Central
Revista:
Molecular Neurodegeneration
ISSN:
1750-1326
e-ISSN:
1750-1326
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
BACKGROUND: Mutations in the presenilin (PSEN) genes are associated with early-onset familial Alzheimer's disease (FAD). Biochemical characterizations and comparisons have revealed that many PSEN mutations alter gamma-secretase activity to promote accumulation of toxic Abeta42 peptides. In this study, we compared the histopathologic and biochemical profiles of ten FAD cases expressing independent PSEN mutations and determined the degradation patterns of amyloid-beta precursor protein (AbetaPP), Notch, N-cadherin and Erb-B4 by gamma-secretase. In addition, the levels of Abeta40/42 peptides were quantified by ELISA. RESULTS: We observed a wide variation in type, number and distribution of amyloid deposits and neurofibrillary tangles. Four of the ten cases examined exhibited a substantial enrichment in the relative proportions of Abeta40 over Abeta42. The AbetaPP N-terminal and C-terminal fragments and Tau species, assessed by Western blots and scanning densitometry, also demonstrated a wide variation. The Notch-1 intracellular domain was negligible by Western blotting in seven PSEN cases. There was significant N-cadherin and Erb-B4 peptide heterogeneity among the different PSEN mutations. CONCLUSION: These observations imply that missense mutations in PSEN genes can alter a range of key gamma-secretase activities to produce an array of subtly different biochemical, neuropathological and clinical manifestations. Beyond the broad common features of dementia, plaques and tangles, the various PSEN mutations resulted in a wide heterogeneity and complexity and differed from sporadic AD.
Palabras clave:
Presenilin
,
Fad
,
Mutations
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Colecciones
Articulos(IIBBA)
Articulos de INST.DE INVEST.BIOQUIMICAS DE BS.AS(I)
Articulos de INST.DE INVEST.BIOQUIMICAS DE BS.AS(I)
Citación
Maarouf, Chera L.; Daugs, Ian D.; Spina, Salvatore; Vidal, Ruben; Kokjohn, Tyler A.; et al.; Histopathological and molecular heterogeneity among individuals with dementia associated with Presenilin mutations; BioMed Central; Molecular Neurodegeneration; 3; 20; 11-2008; 1-18
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