Immunoreactivity to cell surface syndecans in cytoplasm and nucleus: tubulin-dependent rearrangements

Experimental Cell Research
Ulrika BrockstedtA Hjerpe

Abstract

Syndecans are transmembrane proteoglycans implicated in the regulation of cell growth and differentiation, by interacting with growth factors. Although syndecans play a major role in regulating cell morphology, little is known about their subcellular distribution and in vivo association with the cytoskeleton. To address this question, we investigated the subcellular distribution and dynamic rearrangement of syndecans-1, -2, and -4, using confocal laser microscopy. Furthermore, we monitored the spatial relation of syndecans to tubulin in both mitotic and interphase cells. Initially, the reactivity to syndecans was confined to the cytoplasm, staining of the cell membranes appearing later. Syndecan-1 also seems to translocate to the nucleus in a time-dependent manner. The mitotic spindle shows unexpectedly more syndecans than that found in interphase cells. After vinblastine treatment, both syndecan-1 and tubulin were recovered as paracrystalline occlusion bodies, and the nuclear reactivity to syndecan-1 disappeared, suggesting tubulin-mediated nuclear transport of this proteoglycan. Plasma membrane staining reappeared in the postmitotic cells. Nuclear translocation predominantly affected syndecan-1, whereas syndecan-2 and -4 rema...Continue Reading

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