Effect of lipopolysaccharide structure on functional response of whole blood cells

Immunobiology. 2021 Jan;226(1):152030. doi: 10.1016/j.imbio.2020.152030. Epub 2020 Nov 23.

Abstract

Lipopolysaccharides (LPSs) induce a wide spectrum of functional activities after interaction with blood cells. Effect of structure of toxic LPS from S- and Re-chemotypes of E. coli and/or non-toxic LPS of Rhodobacter capsulatus PG (R. caps.) on activation of neutrophils and monocytes of human whole blood were studied, particularly, expression of TLR4, CD14 and CD11b receptors, phagocytosis of BioParticles Alexa Fluor 488, synthesis of cytokines and chemokines. A leading role of CD11b receptor in phagocytic activity of neutrophils primed by LPS from various E. coli chemotypes was shown. The non-toxic LPS of R. caps. does not affect the efficiency of phagocytosis activity of the neutrophils. The LPS of R. caps. was shown to induce production of TRIF-dependent cytokine IFN-β in human whole blood leukocytes selectively, without activating MyD88-dependent pathway of pro-inflammatory cytokine synthesis, displaying properties of patrial agonist of TLR4. Structure and biological activity of LPS R. caps. allows considering it as a promising immunity stimulating pharmacological agent.

Keywords: CD11b; CD14; Chemokines; Cytokines; Lipopolysaccharides; Phagocytosis; TLR4.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • CD11b Antigen / metabolism
  • Escherichia coli / physiology*
  • Escherichia coli Infections / immunology*
  • Female
  • Healthy Volunteers
  • Humans
  • Immunization
  • Lipopolysaccharides / pharmacology*
  • Male
  • Monocytes / immunology*
  • Neutrophils / immunology*
  • Phagocytosis
  • Rhodobacter capsulatus / physiology*
  • Toll-Like Receptor 4 / agonists*

Substances

  • CD11b Antigen
  • Lipopolysaccharides
  • Toll-Like Receptor 4