Effects of eIF6 on the expression of pro-inflammatory mediators derived from M2 macrophages

Objective　To explore the effects of eukaryotic translation initiation factor 6 (eIF6) on the expression of fibrotic cy tokines and metabolic enzymes derived from M2 macrophages. Methods　eIF6 wild type mice (eIF6+/+) and eIF6 knock out mice (eIF6+/-) were used. Macrophages were collected from peritoneal lavage fluid, and they were stimulated with IL-4 for enrichment of M2 macrophages. The differential gene expressions of eIF6+/+ and eIF6+/- M2 macrophages were studied with gene chip. The differential expression of genes was further confirmed with both RT-PCR and ELISA. Results　The gene chip showed that the expressions of VEGF and TIMP-2 were down-regulated in eIF6+/+ macrophages compared with those in eIF6+/- M2 macrophages, while the expression of MMP-2 was up-regulated in eIF6+/+ M2 macrophages (P<0.05). The result of RT-PCR and ELISA had confirmed that the RNA and protein expressions of VEGF and TIMP-2 were decreased in eIF6+/+ macrophages compared with those in eIF6+/- M2 macrophages, while the RNA and protein expressions of MMP-2 were up-regulated in eIF6+/+ M2 macrophages (P<0.05). Conclusion　eIF6 not only inhibits the expression of VEGF, reduces angiogenesis and granulation tissue formation, but also enhances the extracellular matrix degradation and deposition by regulating the balance of MMP2/TIMP2, and thus attenuating the degree of fibrosis (scar formation). DOI: 10.11855/j.issn.0577-7402.2015.02.04