Erschienen in:
01.01.2016 | Original Research Paper
A novel N-acetyl-glucosamine lectin of Lonchocarpus araripensis attenuates acute cellular inflammation in mice
verfasst von:
Alana F. Pires, Natália V. F. C. Rodrigues, Pedro Marcos G. Soares, Ronaldo de Albuquerque Ribeiro, Karoline S. Aragão, Márcia M. Marinho, Mayara T. L. da Silva, Benildo S. Cavada, Ana Maria S. Assreuy
Erschienen in:
Inflammation Research
|
Ausgabe 1/2016
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Abstract
Objective and design
This study had investigated the anti-inflammatory activity of a seed lectin (LAL) isolated from Lonchocarpus araripensis.
Material/methods
LAL was purified by affinity chromatography (chitin column) and ion exchange chromatography (DEAE-Sephacel). In vitro LAL was tested for hemagglutinating activity against rabbit erythrocytes. In vivo LAL was assessed for the anti-inflammatory activity via intravenous injection (i.v.) in Swiss mice (25–30 g; n = 6/group) in models of paw edema and peritonitis. Statistical analysis: ANOVA (p < 0.05).
Results
LAL revealed two bands of 30 and 60 kDa (SDS-PAGE) and exhibited hemagglutinating activity. LAL (10 mg/kg) inhibited the paw edema (77 %) and vascular permeability (26 %) induced by carrageenan, and the paw edema induced by serotonin (80 %), bradykinin (49 %), sodium nitroprusside (83 %), TNF-α (75 %) and PGE2 (64 %). LAL also inhibited the neutrophil migration induced by fMLP (70 %) or carrageenan (69 %). The intravital microscopy showed that LAL inhibited rolling (83 %) and adhesion (70 %) of leukocytes. LAL anti-inflammatory effect was reversed by its association with N-acetyl-glucosamine. The nine-daily treatment with LAL (10 mg/kg; i.v.) showed no toxicity.
Conclusion
The novel N-acetyl-d-glucosamine-binding lectin isolated from L. araripensis seeds presents anti-inflammatory effect involving the lectin domain and the inhibition of 5-HT, BK, PGE2, NO, TNF-α and leukocyte rolling and adhesion.