4.4 Article

Pharmacological analysis of the neutrophil migration induced by D. rostrata lectin: Involvement of cytokines and nitric oxide

Journal

TOXICON
Volume 54, Issue 6, Pages 736-744

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.toxicon.2009.05.037

Keywords

Cytokines; Dioclea rostrata; Inflammation; Lectin; Leukocyte migration; Nitric oxide; Macrophage

Funding

  1. FUNCAP
  2. CAPES
  3. CNPq
  4. Alencar
  5. Assreuy
  6. Cavada
  7. Cunha

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In the present study, we investigated the involvement of resident cell and inflammatory mediators in the neutrophil migration induced by chemotactic activity of a glucose/mannose-specific lectin isolated from Dioclea rostrata seeds (DrosL). Rats were injected i.p. with DrosL (125-1000 mu g/cavity), and at 2-96 h thereafter the leukocyte counts in peritoneal fluid were determined. DrosL-induced a dose-dependent neutrophil migration accumulation, which reached maximal response at 24 h after injection and declines thereafter. The carbohydrate ligand nearly abolished the neutrophil influx. Pre-treatment of peritoneal cavities with thioglycolate which increases peritoneal macrophage numbers, enhanced neutrophil migration induced by DrosL by 303%. However, the reduction of peritoneal mast cell numbers by treatment of the cavities with compound 48/80 did not modify DrosL-induced neutrophil migration. The injection into peritoneal cavities of supernatants from macrophage cultures stimulated with DrosL (125, 250 and 500 mu g/ml) induced neutrophil migration. In addition, DrosL treatment induced cytokines (TNF-alpha, IL-1 beta and CINC-1) and NO release into the peritoneal cavity of rats. Finally, neutrophil chemotaxis assay in vitro showed that the lectin (15 and 31 mu g/ml) induced neutrophil chemotaxis by even 180%. In conclusion, neutrophil migration induced by D. rostrata lectin occurs by way of the release of NO and cytokines such as IL-1 beta, TNF-alpha and CINC-1. (C) 2009 Elsevier Ltd. All rights reserved.

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