A LewisX Glycoprotein Screen Identifies the Low Density Lipoprotein Receptor-related Protein 1 (LRP1) As a Modulator of Oligodendrogenesis in Mice

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 2013 Apr 26

PMID 23615909

Citations 19

Authors

Eva Hennen

Dina Safina

Ute Haussmann

Philipp Worsdorfer

Frank Edenhofer

Ansgar Poetsch

Andreas Faissner

Affiliations

Soon will be listed here.

Abstract

In the developing and adult CNS multipotent neural stem cells reside in distinct niches. Specific carbohydrates and glycoproteins are expressed in these niche microenvironments which are important regulators of stem cell maintenance and differentiation fate. LewisX (LeX), also known as stage-specific embryonic antigen-1 or CD15, is a defined carbohydrate moiety expressed in niche microenvironments of the developing and adult CNS. LeX-glycans are involved in stem cell proliferation, migration, and stemness. A few LeX carrier proteins are known, but a systematic analysis of the targets of LeX glycosylation in vivo has not been performed so far. Using LeX glycosylation as a biomarker we aimed to discover new glycoproteins with a potential functional relevance for CNS development. By immunoaffinity chromatography we enriched LeX glycoproteins from embryonic and postnatal mouse brains and used one-dimensional nLC-ESI-MS/MS for their identification. We could validate phosphacan, tenascin-C, and L1-CAM as major LeX carrier proteins present in vivo. Furthermore, we identified LRP1, a member of the LDL receptor family, as a new LeX carrier protein expressed by mouse neural stem cells. Surprisingly, little is known about LRP1 function for neural stem cells. Thus, we generated Lrp1 knock-out neural stem cells by Cre-mediated recombination and investigated their properties. Here, we provide first evidence that LRP1 is necessary for the differentiation of neural stem cells toward oligodendrocytes. However, this function is independent of LeX glycosylation.

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