Brain ApoA-I, ApoJ and ApoE immunodetection in cerebral amyloid angiopathy
Camacho, Jessica (Hospital Universitari Vall d'Hebron)
Moliné, Teresa (Hospital Universitari Vall d'Hebron)
Bonaterra-Pastra, Anna (Hospital Universitari Vall d'Hebron. Institut de Recerca)
Ramon y Cajal, Santiago (Hospital Universitari Vall d'Hebron)
Martinez-Saez, Elena (Hospital Universitari Vall d'Hebron)
Hernández-Guillamon, Mar (Hospital Universitari Vall d'Hebron)

Fecha:	2019
Resumen:	Cerebral amyloid angiopathy (CAA) is a common cause of lobar intracerebral hemorrhage (ICH) in elderly individuals and it is the result of the cerebrovascular deposition of beta-amyloid (Ab) protein. CAA is frequently found in patients with Alzheimer's disease (AD), although it has an independent contribution to the cognitive deterioration associated with age. Specific apolipoproteins (Apo) have been associated with Ab fibrillization and clearance from the brain. In this regard, in the present study, we analyzed the brain levels of ApoE, ApoA-I, and ApoJ/clusterin in autopsy brains from 20 post-mortem cases with CAA type I, CAA type II, with parenchymal Ab deposits or without Aβ deposits. Our objective was to find a possible differential pattern of apolipoproteins distribution in the brain depending on the CAA pathological presentation. The protein expression levels were adjusted by the APOE genotype of the patients included in the study. We found that ApoE and ApoJ were abundantly present in meningeal, cortical, and capillary vessels of the brains with vascular Aβ accumulation. ApoE and ApoJ also deposited extracellularly in the parenchyma, especially in cases presenting Aβ diffuse and neuritic parenchymal deposits. In contrast, ApoA-I staining was only relevant in capillary walls in CAA type I cases. On the other hand, ICH was the principal cause of death among CAA patients in our cohort. We found that CAA patients with ICH more commonly had APOE+2 compared with CAA patients without ICH. In addition, patients who suffered an ICH presented higher vascular ApoE levels in brain. However, higher ApoE presence in cortical arteries was the only independent predictor of suffering an ICH in our cohort after adjusting by age and APOE genotype. In conclusion, while ApoE and ApoJ appear to be involved in both vascular and parenchymal Ab pathology, ApoA-I seems to be mainly associated with CAA, especially in CAA type I pathology. We consider that our study helps to molecularly characterize the distribution subtypes of Aβ deposition within the brain.
Ayudas:	Instituto de Salud Carlos III CP12-03259 Instituto de Salud Carlos III PI14-01134 Instituto de Salud Carlos III PI17-00275 Instituto de Salud Carlos III CPII17-00010
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Publicado en:	Frontiers in neurology, Vol. 10 (2019) , p. 187, ISSN 1664-2295

DOI: 10.3389/fneur.2019.00187
PMID: 30918495

12 p, 4.1 MB

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