miR-155 expression is increased in mice with OVA-induced asthma and decreased after the administration of a miR-155 shRNA lentiviral vector in vivo. (A) Relative expression of miRNA-155 in mouse lungs. (B) Fluorescence microscopy of mouse lung sections (magnification, ×100) after lentiviral vector exposure showing green fluorescent protein expression. n=4–6 mice/group. *P<0.01 vs. the saline group; #P<0.01 vs. Mock group. OVA, ovalbumin; miR-155, microRNA-155; shRNA, short hairpin RNA; GFP, green florescent protein.