Chemical and biological characterization of pectin-like polysaccharides from the bark of the Malian medicinal tree Cola cordifolia

Ingvild Austarheim, Bjørn E. Christensen, Ida K. Hegna, Bent O. Petersen, Jens Øllgaard Duus, Ragnar Bye, Terje E. Michaelsen, Drissa Diallo, Marit Inngjerdingen, Berit S. Paulsen

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Abstract

The bark of Cola cordifolia used in Malian traditional medicine contains unusual types of polysaccharides with immunomodulating activities. We report for the first time on the structure of a polymer designated CC1P1 having the repeating structure [2→)[α-d-Gal(1→3)]α-l-Rha(1→4)α-d-GalA(1→] as determined by NMR and GC/MS. α-Linked Gal is unusual in pectins. The Mw of 135kDa was determined by SEC-MALLS. CC1P2 (1400kDa), another polymer, having the same backbone, but this was substituted with α-4-OMe-GlcA, α-2-OMe-Gal and α-Gal as terminal units. CC1P1 shows a high complement-fixing activity, IC50 being 2.2 times lower than the positive pectin control PMII (IC50 appr. 71μg/mL) while IC50 of CC1P2 is 1.8 times lower. The simple structure of CC1P1 did not activate macrophages, while CC1P2 (100μg/mL) showed the same potency as the positive controls PMII (100μg/mL) and LPS (500ng/mL). No cytotoxicity was detected.
Original languageEnglish
JournalCarbohydrate Polymers
Volume89
Issue number1
Pages (from-to)259-268
ISSN0144-8617
DOIs
Publication statusPublished - 2012
Externally publishedYes

Keywords

  • Cola cordifolia
  • Pectin
  • Structure
  • Rhamnogalacturonan
  • Immunological activity
  • Complement system
  • Cytotoxicity

Cite this

Austarheim, I., Christensen, B. E., Hegna, I. K., Petersen, B. O., Duus, J. Ø., Bye, R., Michaelsen, T. E., Diallo, D., Inngjerdingen, M., & Paulsen, B. S. (2012). Chemical and biological characterization of pectin-like polysaccharides from the bark of the Malian medicinal tree Cola cordifolia. Carbohydrate Polymers, 89(1), 259-268. https://doi.org/10.1016/j.carbpol.2012.03.005