Polysaccharide-rich extract of Genipa americana leaves exerts anti-inflammatory effects modulated by platelet mediators

Polysaccharide-rich extract of Genipa americana leaves exerts anti-inflammatory effects modulated by platelet mediators

Genipa americana L. (Rubiaceae) leaves are traditionally used to treat fever, pharyngitis, healing, luxation and bruises. This study aimed to investigate the anti-inflammatory effect of the polysaccharide-rich extract of G. americana leaves (PE-Ga) in acute inflammation models and underlying mechani...

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Bibliographic Details
Published in:Journal of ethnopharmacology Vol. 319; p. 117234
Main Authors: Araujo, Diego Freitas de, Holanda, Bianca Feitosa, Nascimento, Francisco Lucas Faustino do, Martins, Alice Brito, Silva, Alefe Lopes Macario, Pereira, Maria Gonçalves, Freitas Pires, Alana de, Assreuy, Ana Maria Sampaio
Format: Journal Article
Language:English
Published: Elsevier B.V 30-01-2024
Subjects:
Inflammation
Jenipapeiro
Oxidative stress
Plant polysaccharides
Platelet
Jenipapeiro
Oxidative stress
Platelet
Inflammation
Plant polysaccharides
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Summary:Genipa americana L. (Rubiaceae) leaves are traditionally used to treat fever, pharyngitis, healing, luxation and bruises. This study aimed to investigate the anti-inflammatory effect of the polysaccharide-rich extract of G. americana leaves (PE-Ga) in acute inflammation models and underlying mechanisms associated with platelet activity. Rats received PE-Ga (0.3–3.0 mg/kg; IV) 30 min before injection (IP or SC) of zymosan, serotonin, PGE2, PLA2, PAF or L-arginine, and evaluated in the models of paw edema and acute peritonits. The blockage of plasma serotonin reuptake into platelets was performed with fluoxetine (40 mg/kg; IP). In vitro, PE-Ga inhibited ADP-induced platelet aggregation up to 49%. In the edema model, PE-Ga reduced (41%) the time-course of the edema induced by zymosan, mainly the last phase (62%), as well as that induced by PLA2 (32%), PAF (35%), L-arginine (36%), PGE2 (49%) or serotonin (54% AUC); and reversed paw hypernociception induced by PGE2 or serotonin. In the peritonitis model, PE-Ga reversed abdominal hypernociception and reduced leukocyte migration induced by zymosan to blood (38%) and peritoneal cavity (55%), mainly neutrophils (70%). PE-GA also decreased leukocyte rolling (32%) and adhesion (47%), and increased the rolling velocity 2.2-fold. In the peritoneal fluid, PE-Ga reversed P-selectin and reduced total proteins (17%), MDA (40%), NO2−/NO3− (27%), and MPO activity (43%) but increased catalase activity 3.3-fold compared to zymosan. In addition, fluoxetine reversed PE-Ga anti-inflammatory effect on leukocyte migration and adhesion. PE-Ga exerts antiplatelet and anti-inflammatory effects in acute inflammation induced by zymosan, being modulated by P-selectin and platelet serotonin, among other inflammatory mediators. [Display omitted] •PE-Ga possesses anti-inflammatory, antinociceptive and antiplatelet actions.•PE-Ga anti-inflammatory effect involves inhibition of platelet mediators.•PE-Ga inhibits oxidative stress markers.
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ISSN:0378-8741
1872-7573
DOI:10.1016/j.jep.2023.117234