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Insights into the Role of Chondroitin Sulfate in Cancer

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Glycosignals in Cancer
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Abstract

Chondroitin sulfate (CS) chains are secreted into the extracellular matrices or are associated with the plasma membranes of virtually all cells. They are covalently attached to the serine (Ser) residues of core proteoglycan proteins. The expression levels and/or fine structure of CS chains are altered in response to environmental cues, and such changes are involved in controlling cell fate decisions. CS chains selectively interact with numerous proteins, including growth factors, morphogens, adhesion molecules, and receptors, and regulate various cellular and/or tissue processes. These interactions between various signaling molecules and the CS moieties of proteoglycans (PGs) are the molecular basis for the functions of PGs as signaling modulators, transductors of signals into cells, and regulators of cellular functions. In addition, it is thought that the interactions between proteins and CS chains are regulated by the fine structure of CSs. The CS chains consist of N-acetylgalactosamine (GalNAc) residues alternating in glycosidic linkages with glucuronic acid residues. During the biosynthesis of CS chains, GalNAc residues are sulfated to varying degrees at the 4- and/or 6-positions. Recent studies have indicated that CS chains encode important functional information via the introduction of position-specific sulfate groups. Here, we describe the significance of CS-PGs as signal molecules or co-receptors of soluble factors such as growth factors/morphogens in cancer biology. In addition, we discuss how alterations in CS structures activate cancer-related cell signaling and lead to cancer progression.

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Correspondence to Hiroshi Kitagawa .

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Nadanaka, S., Kitagawa, H. (2023). Insights into the Role of Chondroitin Sulfate in Cancer. In: Furukawa, K., Fukuda, M. (eds) Glycosignals in Cancer. Springer, Singapore. https://doi.org/10.1007/978-981-19-7732-9_5

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