Abstract
In the central and peripheral nervous systems a heterogeneous group of proteins constituting the thrombospondin superfamily provides a cue for axonal pathfinding. They either contain or are devoid of the tripeptide RGD, and the sequence(s) and mechanism(s) which trigger in vitro their neurite-promoting activity have remained unclear. In this study, we reconsider the problem of whether sequences present in the thrombospondin type 1 repeats (TSRs), and independent of the well-known RGD-binding site, may activate integrins and account for their neurite-promoting activity. SCO-spondin is a newly identified member of the thrombospondin superfamily, which shows a multidomain organization with a great number of TSR motifs but no RGD sequence. Previous research has implicated oligopeptides derived from SCO-spondin TSRs in in-vitro development of various neuronal cell types. In this study, we investigate whether function-blocking antibodies directed against integrin subunits can block these effects in cell line B104, cloned from a neuroblastoma of the rat central nervous system. By two different approaches: flow cytometry revealing short-term effects and cell cultures revealing long-term effects, we show that: (a) activation of cell metabolism, (b) changes in cell size and structure, and (c) neurite-promoting activity induced by TSR oligopeptides are inhibited by function-blocking antibodies to β1-subunit. Using a panel of function-blocking antibodies directed against various integrin α-subunits we show that the α1-subunit might be the partner of the β1-subunit in B104 cells. Thus, we demonstrate that an original sequence within a TSR motif from SCO-spondin promotes neurite outgrowth through an intracellular signal driven by integrins, independently of an RGD-binding site.
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Acknowledgments
The authors are grateful to Dr. Jean-Loup Duband for fruitful discussions and for critically reading the manuscript. Thanks are also due to Dr. Chantal Rappatel, Fredérique Lioret and Pascal Pigeon for technical assistance with the flow cytometry.
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Bamdad, M., Volle, D., Dastugue, B. et al. α1β1-Integrin is an essential signal for neurite outgrowth induced by thrombospondin type 1 repeats of SCO-spondin. Cell Tissue Res 315, 15–25 (2004). https://doi.org/10.1007/s00441-003-0793-2
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DOI: https://doi.org/10.1007/s00441-003-0793-2