Functional chondroitin sulfate from Enteroctopus dofleini containing a 3-O-sulfo glucuronic acid residue

Kyohei Higashi, Yusuke Okamoto, Ann Mukuno, Jun Wakai, Saori Hosoyama, Robert J. Linhardt, Toshihiko Toida

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

There are several reports that chondroitin sulfate containing K-type units [GlcA (3S)-GalNAc (4S)] exhibiting similar levels of neurite outgrowth promoting activities as CS having high amounts of B-, D- and E-type disulfated disaccharides. Although CS containing K-type units possess important biological activities, there are only few sources, such as king crab cartilage, squid cartilage or sea cucumber. In this study, CS containing 13.9% of K-type units was found in octopus (Enteroctopus dofleini) cartilage using different substrate specificities of chondroitinases. The 2D NMR spectra showed cross-peaks assigned to protons on sugar ring of GlcA (3S), demonstrating the presence of K-type units in octopus CS. Furthermore, proportion of fucosylated disaccharide units in octopus CS was very low. Octopus CS showed high affinity for growth factors and stimulated neurite outgrowth of hippocampal neurons, similar to the activity of squid CS-E. These results strongly suggest that octopus cartilage is a rich source of CS-K and has important biological activities.

Original languageEnglish
Pages (from-to)557-565
Number of pages9
JournalCarbohydrate Polymers
Volume134
DOIs
StatePublished - 24 Aug 2015
Externally publishedYes

Keywords

  • Chondroitin sulfate
  • Growth factors
  • K-unit
  • Octopus cartilage

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