Downregulating the Expression of CHID1 by Chitin Microparticles Mixed Leukocyte Culture

Abstract Background: chitin and its derivates microparticles (MPs) have immunomodulatory activities. In this study, we examined the effect of size, purity and acetylation degree of chitin MPs on CHID1- encoding SI-CLP, involved in inflammation- gene expression in mixed leukocyte culture. Materials and Methods: Small (<40) and medium(40-70) sized chitin MPs were prepared by sonication, and they were used in treatment of leukocyte mixed culture in comparison with chitosan and also shrimp shell small-sized MPs. Neutral red uptake assay and microscopic examination of apoptosis were used to assess cytotoxicity of MPs. Finally, following cell treatment with MPs (100 μg/mL) for 48h, expression levels of CHID1 gene were determined by Real Time PCR. Results: Different concentrations of chitinous MPs hadn’t any cytotoxic effects. In gene expression analysis, small-sized chitin MPs (