Volume 28, Issue 4 pp. 1189-1196
Article
Free Access

Up-regulated expression of decay-accelerating factor (CD55) confers increased complement resistance to sprouting neural cells

Ke-zhou Zhang

Ke-zhou Zhang

Department of Pathology, Haartman Institute, University of Helsinki, Helsinki, Finland

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Sami Junnikkala

Sami Junnikkala

Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki, Helsinki, Finland

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Mark G. Erlander

Mark G. Erlander

R. W. Johnson Pharmaceutical Research Institute, San Diego, USA

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Hongqing Guo

Hongqing Guo

R. W. Johnson Pharmaceutical Research Institute, San Diego, USA

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Johan A. Westberg

Johan A. Westberg

Department of Pathology, Haartman Institute, University of Helsinki, Helsinki, Finland

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Seppo Meri

Seppo Meri

Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki, Helsinki, Finland

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Leif C. Andersson

Leif C. Andersson

Department of Pathology, Haartman Institute, University of Helsinki, Helsinki, Finland

Department of Pathology, Karolinska Institute, Stockholm, Sweden

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Abstract

We studied gene expression in relation to induced neural differentiation in a human neural crest-derived cell line, Paju. Messenger RNA isolated before and after treatment with phorbol 12-myristate 13-acetate was analyzed by differential display reverse transcription PCR. A strongly up-regulated expression of decay-accelerating factor (DAF, CD55) was found to parallel the induced neural sprouting while the expression of two other complement regulatory proteins (CD59/protectin, CD46/membrane cofactor protein) remained unaltered during neural differentiation. The increased membrane expression of DAF, which was also seen on neural processes and growth cones, conferred elevated resistance to complement-mediated lysis. Our findings suggest that in sprouting neurons DAF expression is up-regulated to provide additional complement resistance to pathfinding axons/dendrites invading new environment. It is also suggested that membrane expression of DAF may constitute a marker of growing and regenerating neurons.

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