The impact of the level and distribution of methyl-esters of pectins on TLR2-1 dependent anti-inflammatory responses

M. Beukema*, E. Jermendi, M.A. van den Berg, M.M. Faas, H.A. Schols, P. de Vos

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Pectins have anti-inflammatory effects via Toll-like receptor (TLR) inhibition in a degree of methyl-esterification-(DM)-dependent manner. However, pectins also vary in distribution of methyl-esters over the galacturonic-acid (GalA) backbone (Degree of Blockiness - DB) and impact of this on anti-inflammatory capacity is unknown. Pectins mainly inhibit TLR2-1 but magnitude depends on both DM and DB. Low DM pectins (DM18/19) with both low (DB86) and high DB (DB94) strongly inhibit TLR2-1. However, pectins with intermediate DM (DM43/DM49) and high DB (DB60), but not with low DB (DB33), inhibit TLR2-1 as strongly as low DM. High DM pectins (DM84/88) with DB71 and DB91 do not inhibit TLR2-1 strongly. Pectin-binding to TLR2 was confirmed by capture-ELISA. In human macrophages, low DM and intermediate DM pectins with high DB inhibited TLR2-1 induced IL-6 secretion. Both high number and blockwise distribution of non-esterified GalA in pectins are responsible for the anti-inflammatory effects via inhibition of TLR2-1.

Original languageEnglish
Article number117093
JournalCarbohydrate Polymers
Volume251
Early online date16 Sep 2020
DOIs
Publication statusPublished - 1 Jan 2021

Keywords

  • Degree of blockiness
  • Degree of methyl-esterification
  • Pectin
  • Toll-like receptor 2

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