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. 1990 Aug;137(2):291–300.

Immunochemical demonstration of tropomyosin in the neurofibrillary pathology of Alzheimer's disease.

P G Galloway 1, P Mulvihill 1, S Siedlak 1, M Mijares 1, M Kawai 1, H Padget 1, R Kim 1, G Perry 1
PMCID: PMC1877611  PMID: 2386197

Abstract

The focus of research on the neurofibrillary pathology (NFP) of Alzheimer disease has been not only to determine the component forming the paired helical filaments but also to determine whether they result from abnormal processes affecting a single protein. Therefore, although these studies have lead to controversy concerning the respective contribution of components of microtubules and neurofilaments, there has been essentially no consideration of whether other cytoskeletal systems might also be involved and of what are the common features for the incorporated components. Particularly relevant to this issue is our finding that several antisera raised to either skeletal or smooth muscle tropomyosin, a microfilament component, intensely recognize NFP. These antibodies continue to recognize NFP after affinity purification to tropomyosin or paired helical filament fractions. We show that the antibodies do not recognize NFP due to cross-reactivity with the previously identified NFP components related to neurofilaments and microtubules, tau, and MAP2, or neurofilament proteins because the antisera did not recognize these proteins on immunoblots or were not adsorbable by the proteins. Ultrastructural analysis of the immunoreaction showed that tropomyosin-related epitopes were clustered rather than uniformly distributed along paired helical and straight filaments. Although the distribution suggests that tropomyosin is an NFP-associated protein, its retention by paired helical and straight filaments after detergent extraction indicates that it is an integral component strongly and specifically associated with the filaments characteristic of NFP. These findings indicate that NFP involves the three primary neuronal cytoskeletal filament systems, microtubules, neurofilaments, as well as microfilaments, and therefore that NFP probably results from the reorganization of these normal filaments that interact to comprise the cytomatrix and may continue this interaction under the pathologic condition of Alzheimer's disease to generate novel, abnormal polymers.

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