科研之友
微信
新浪微博
Facebook
分享链接
摘要
Tauopathies are neurodegenerative diseases characterized by hyper-phosphorylated tau deposition in neurons and glial cells. Chaperones, such as small heat shock proteins B-crystallin and HSP27 highly expressed in normal glial cells, have been postulated as putative molecules preventing abnormal deposition and folding in glial cells in tauopathies. The objective of this work was to assess the expression of B-crystallin, phosphorylated B-crystallin at Ser59 and HSP27 in glial cells with and without tau deposits in progressive supranuclear palsy, corticobasal degeneration (CBD), argyrophilic grain disease (AGD), Pick%26apos;s disease (PiD), Alzheimer%26apos;s disease, frontotemporal lobar degeneration associated with mutations in the tau gene (FTLD-tau), globular glial tauopathy (GGT) and tauopathy in the elderly. Immunohistochemistry, and double-labeling immunofluorescence and confocal microscopy have been used for this purpose. Increased expression of B-crystallin and phosphorylated B-crystallin at Ser59 occurs in a subpopulation of glial cells with and without hyper-phosphorylated tau deposition in all the analyzed tauopathies, but their expression in neurons is restricted to ballooned neurons in CBD, AGD and PiD. HSP27 barely co-localizes with tau and with phosphorylated B-crystallin at Ser59, thus making the formation of active dimers operating as chaperones unlikely. Results suggest a limited function of B-crystallin and HSP27 in preventing abnormal tau protein deposition in glial cells and neurons; in addition, the expression of B-crystallin phosphorylated at Ser59 may act as a protective factor in glial cells.
- 出版日期2014-12
