Abstract
Recent studies reported both positive [Thal et al. (2003) J Neuropathol Exp Neurol 62:1287–1301] and negative [Tian et al. (2003) Neurosci Lett 352:137–140] correlations between cerebral amyloid angiopathy (CAA) and Alzheimer’s disease (AD) pathology. We have recently shown high correlations between neuritic AD pathology and amyloid β peptide (Aβ) deposits in the capillary/pericapillary compartment (CapCAA) with only low correlations to general CAA (non-capillary). We have now studied the relationship between CapCAA and AD pathology with respect to the distribution of Aβ40 and 42 in the frontal cortex of 100 human postmortem brains from both male and female, demented and non-demented patients (mean age ± SD 84.3±9.3 years). Using polyclonal antibodies to Aβ40 and 42, capillary and plaques positivity were assessed semiquantiatively on a four-point scale. Aβ42 deposits in capillaries correlated highly with both Aβ42 deposits in plaques and morphological AD criteria (CERAD, Braak stages, and NIA-Reagan-Institute criteria), while only a low correlation with CAA was observed. Aβ40 deposits in capillaries differed morphologically from Aβ42 ones: they were limited to capillary walls, were significantly less frequent in both capillaries and plaques compared to Aβ42 (P<0.01), and showed a low correlation with morphological AD criteria (P<0.05) and general CAA (P<0.01). By contrast, Aβ42 deposits were seen in the glia limitans rather than in capillary walls themselves, and showed high correlation with morphological AD criteria (P<0.01). These data indicate that CapCAA is characterized by Aβ42 deposits in pericapillary spaces or in the glia limitans. A low correlation between CAA and CapCAA, but high correlations between morphological AD criteria and CapCAA suggest different pathomechanisms for both types of CAA, and a close relation between CapCAA and AD pathology (both neuritic and plaque type). These data support the concept of a neuronal origin of Aβ via drainage from interstitial fluid from the central nervous system along basement membranes to capillaries.
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Abbreviations
- AD:
-
Alzheimer disease
- Aβ:
-
beta amyloid peptide
- Aβ 40/42 CapS:
-
score of deposits of Aβ 1–40/42 in capillaries
- Aβ 40/42 C:
-
number of Aβ 1–40/42 positive cortical vessels
- Aβ 40/42 PS:
-
score of deposits of Aβ 1–40/42 in plaques
- Aβ 40/42 TS:
-
total score of Aβ 1–40/42 deposits
- Aβ 40/42 Csev:
-
severity of Aβ 1–40/42 affection of cortical vessels
- Aβ 40/42 CS:
-
Aβ 1–40/42 cortical score
- Aβ 40/42 L:
-
percentage of Aβ 40/42 positive leptomeningeal vessels
- Aβ 40/42 Lsev:
-
severity of Aβ 40/42 affection of leptomeningeal vessels
- Aβ 40/42 LS:
-
Aβ 40/42 leptomeningeal score
- AβCTS:
-
Aβ cortical total score
- AβLTS:
-
Aβ leptomeningeal total score
- CAA:
-
cerebral amyloid angiopathy
- CAATS:
-
CAA total score
- CapCAA:
-
capillary CAA
- CERAD:
-
Consortium to Establish a Registry of Alzheimer’s Disease
- NFT:
-
neurofibrillary tangle
- NIA:
-
National Institute of Aging
- NIA-RI:
-
National Institute of Aging and Reagan Institute
- NP:
-
neuritic plaque
- SP:
-
senile plaque
- TS:
-
total score
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Acknowledgements
The authors thank Mrs. Veronika Rappelsberger and Mrs. Barbara Weidinger for excellent laboratory work, Erich Mitter-Ferstl, PhD, for secretarial and computer work, and Prof. Roy Weller, Southampton, for critical remarks. Part of the study was supported by the Society for the Support of Research in the Field of Experimental Neurology and by Consultatio GmbH, both Vienna, Austria.
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An erratum to this article can be found at http://dx.doi.org/10.1007/s00401-004-0866-7
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Attems, J., Lintner, F. & Jellinger, K.A. Amyloid β peptide 1–42 highly correlates with capillary cerebral amyloid angiopathy and Alzheimer disease pathology. Acta Neuropathol 107, 283–291 (2004). https://doi.org/10.1007/s00401-004-0822-6
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DOI: https://doi.org/10.1007/s00401-004-0822-6