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Expression of X-chromosome linked inhibitor of apoptosis protein in mature Purkinje cells and in retinal bipolar cells in transgenic mice induces neurodegeneration
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience.
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2008 (English)In: Neuroscience, ISSN 0306-4522, Vol. 156, no 3, 515-526 p.Article in journal (Refereed) Published
Abstract [en]

Transgenic mice with overexpression of the caspase-inhibitor, X-chromosome-linked inhibitor of apoptosis protein (XIAP) in Purkinje cell (PC) and in retinal bipolar cells (RBCs) were produced to study the regulation of cell death. Unexpectedly, an increased neurodegeneration was observed in the PCs in these L7-XIAP mice after the third postnatal week with the mice exhibiting severe ataxia. The loss of PCs was independent of Bax as shown by crossing the L7-XIAP mice with Bax gene-deleted mice. Electron microscopy revealed intact organelles in PCs but with the stacking of ER cisterns indicative of cell stress. Immunostaining for cell death proteins showed an increased phosphorylation of c-Jun in the PCs, suggesting an involvement in cell degeneration. Apart from PCs, the number of RBCs was decreased in adult retina in line with the expression pattern for the L7 promoter. The data show that overexpression of the anti-apoptotic protein XIAP in vulnerable neurons leads to enhanced cell death. The mechanisms underlying this neurodegeneration can be related to the effects of XIAP on cell stress and altered cell signaling.

Place, publisher, year, edition, pages
2008. Vol. 156, no 3, 515-526 p.
Keyword [en]
cerebellum, Purkinje cell, ataxia, retinal bipolar cells, XIAP, Jun N-terminal kinase
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-107120DOI: 10.1016/j.neuroscience.2008.08.005ISI: 000260508100010PubMedID: 18765270OAI: oai:DiVA.org:uu-107120DiVA: diva2:227716
Available from: 2009-07-16 Created: 2009-07-16 Last updated: 2009-07-16Bibliographically approved

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