Inhibitory effect of heparin-derived oligosaccharides on secretion of interleukin-4 and interleukin-5 from human peripheral blood T lymphocytes

AIM: To investigate the inhibitory effect of heparin-derived oligosaccharides (Oligs) on secretion of interleukin-4 (IL-4) and interleukin-5 (IL-5) from human peripheral blood T lymphocytes (PBTLs).METHODS: Oligs were prepared by three different heparin depolymerization methods and separated by gel filtration chromatography. PBTLs from ten adult patients with allergic eosinophilic gastroenteritis were treated with phytahematoagglutinin (PHA) and Oligs. The supernatants from the cell culture of PBTLs were harvested and subjected to the determination of IL-4 and IL-5 contents by ELISA method.RESULTS: At the concentration of 5μg/mL, Oligs with different Mr had different effects on the secretion of IL-4 and IL-5. The tetrasaccharide with Mr of 1 142, produced by depolymerizing heparin with hydrogen peroxide, had the strongest inhibitory effect on the secretion of IL-4. It decreased the IL-4 content from 375.6±39.2 ng/L (PHA group) to 12.5±5.7 ng/L (P<0.01). The hexasaccharide with Mr of I 806, produced by depolymerizing heparin with βelimination method, had the strongest inhibitory effect on the secretion of IL-5. It decreased the IL-5 content from 289.2±33.4 ng/L (PHA group) to 22.0±5.2 ng/L (P<0.01).CONCLUSION: The inhibitory activity of Oligs on the secretion of IL-4 and IL-5 from human PBTLs closely depends on their molecular structure, and there may be an essential structure to act as an inhibitor. The most effective inhibitors of IL-4 and IL-5 secretion are tetrasaccharides and hexasaccharides, respectively.

AIM:To investigate the inhibitory effect of heparin-derived oligosaccharides(Oligs)on secretion of interleukin-4(IL-4) and interleukin-5(IL-5)from human peripheral blood T lymphocytes(PBTLs). METHODS:Oligs were prepared by three different heparin depolymerization methods and separated by gel filtration chromatography.PBTLs from ten adult patients with allergic eosinophilic gastroenteritis were treated with phytahematoagglutinin(PHA)and Oligs.The supematants from the cell culture of PBTLs were harvested and subjected to the determination of IL-4 and IL-5 contents by ELISA method. RESULTS:At the concentration of 5 μg/mL,Oligs with different M_r had different effects on the secretion of IL-4 and IL-5.The tetrasaccharide with M_r of 1142,produced by depolymerizing heparin with hydrogen peroxide,had the strongest inhibitory effect on the secretion of IL-4.It decreased the IL-4 content from 375.6±39.2 ng/L(PHA group)to 12.5±5.7 nglL(P<0.01).The hexasaccharide with M of 1806,produced by depolymerizing heparin with β-elimination method,had the strongest inhibitory effect on the secretion of IL-5.It decreased the IL-5 content from 289.2±33.4 ng/L(PHA group)to 22.0±5.2 ng/L(P<0.01). CONCLUSION:The inhibitory activity of Oligs on the secretion of IL-4 and IL-5 from human PBTLs closely depends on their molecular structure,and there may be an essential structure to act as an inhibitor.The most effective inhibitors of IL-4 and IL-5 secretion are tetrasaccharides and hexasaccharides,respectively.