PMID- 15615650 OWN - NLM STAT- MEDLINE DCOM- 20050203 LR - 20161126 IS - 0006-3002 (Print) IS - 0006-3002 (Linking) VI - 1739 IP - 2-3 DP - 2005 Jan 3 TI - Tau alteration and neuronal degeneration in tauopathies: mechanisms and models. PG - 331-54 AB - Tau becomes characteristically altered both functionally and structurally in several neurodegenerative diseases now collectively called tauopathies. Although increasing evidence supports that alterations of tau may directly cause neuronal degeneration and cell death, the mechanisms, which render tau to become a toxic agent are still unclear. In addition, it is obscure, whether neurodegeneration in tauopathies occurs via a common mechanism or specific differences exist. The aim of this review is to provide an overview about the different experimental models that currently exist, how they are used to determine the role of tau during degeneration and what has been learnt from them concerning the mechanistic role of tau in the disease process. The review begins with a discussion about similarities and differences in tau alteration in paradigmatic tauopathies such as frontotemporal dementia and parkinsonism linked to chromosome 17 (FTDP-17) and Alzheimer's disease (AD). The second part concentrates on major experimental models that have been used to address the mechanistic role of tau during degeneration. This will include a discussion of cell-free assays, culture models using cell lines or dissociated neurons, and animal models. How these models aid to understand (i) alterations in the function of tau as a microtubule-associated protein (MAP), (ii) direct cytotoxicity of altered tau protein, and (iii) the potential role of tau aggregation in neurodegenerative processes will be the central theme of this part. The review ends with concluding remarks about a general mechanistic model of the role of tau alteration and neuronal degeneration in tauopathies and future perspectives. FAU - Brandt, Roland AU - Brandt R AD - Department of Neurobiology, University of Osnabruck, Barbarastrasse 11, D-49076 Osnabruck, Germany. Brandt@biologie.uni-osnabrueck.de FAU - Hundelt, Monika AU - Hundelt M FAU - Shahani, Neelam AU - Shahani N LA - eng PT - Journal Article PT - Review PL - Netherlands TA - Biochim Biophys Acta JT - Biochimica et biophysica acta JID - 0217513 RN - 0 (Protein Isoforms) RN - 0 (tau Proteins) SB - IM MH - Alzheimer Disease/metabolism/pathology MH - Animals MH - Cells, Cultured MH - Chromosomes, Human, Pair 17 MH - Dementia/metabolism MH - Humans MH - Mice MH - Mice, Transgenic MH - Models, Biological MH - Mutation MH - Nerve Degeneration/metabolism MH - Neurofibrillary Tangles MH - Parkinson Disease/metabolism MH - Protein Isoforms/metabolism MH - Tauopathies/*metabolism MH - tau Proteins/genetics/*metabolism/physiology RF - 228 EDAT- 2004/12/24 09:00 MHDA- 2005/02/04 09:00 CRDT- 2004/12/24 09:00 PHST- 2004/05/05 00:00 [received] PHST- 2004/06/15 00:00 [accepted] PHST- 2004/12/24 09:00 [pubmed] PHST- 2005/02/04 09:00 [medline] PHST- 2004/12/24 09:00 [entrez] AID - S0925-4439(04)00110-3 [pii] AID - 10.1016/j.bbadis.2004.06.018 [doi] PST - ppublish SO - Biochim Biophys Acta. 2005 Jan 3;1739(2-3):331-54. doi: 10.1016/j.bbadis.2004.06.018.