Objective To investigate the pathogen-related genes of atmospheric polluting disease so as to clarify the biology mechanism and provide the scientific basis.Methods By using the technique of dot blot hybridization,we analyzed genes’differential expression with cloning by exposure to ≥75 μg/m3 PM2.5 in heating season and < 75 μg/m3 PM2.5 in un-heating season in WI-38 human embryo lung cells.The levels of cytokines TNF-α,IL-2, IL-6 and IL-8 were determined by radio immunity assay. Results After 24h of treatment, compared with control group,more than 100μg/mL PM2.5 significantly increased TNF-α,IL-6 and IL-8 levels,and decreased IL-2 in WI-38 human embryo lung cells (P < 0.05 ).The clear stripe was found in 350 bp in 48 gene samples with segment with differential expression of genes exposed to different concentrations of PM2.5 in WI-38 human embryo lung cells.Through the dot blot hybridization,black brown spots were found in 41 samples in Tester cDNA hybridization,and no similar spots were found in all of the same samples in Driver cDNA hybridization. Conclusion PM2.5 exposure may induce the inflammatory damage of WI-38 human embryo lung cells.Obvious genetic damage was observed in those cells exposed to ≥75 μg/m3 PM2.5 in heating season.

The cystine knot (CK) motif comprises an internal ring formed by two disulfide bonds and their connecting backbone segments which is threaded by a third disulfide bond .It is present in peptides and proteins of a variety of species ,in-cluding fungi ,plants ,marine molluscs ,insects and spiders .CK polypeptide is one of the ideal model molecules for drug design and molecular engineering research because of its stable structure and variety of bioactivities .Here we summarized the main structural features of both inhibitor cystine knot (ICK) peptide and cyclic cystine knot (CCK) peptide ,including primary se-quence ,topology ,permutation ,synthesis and folding characteristics ,as well as its applications on drug design and molecular engineering .