Objective To investigate the effect of middle-level gaseous formaldehyde on the expression of vanilloid receptor subtype 1 (VR1) gene in the respiratory system, Methods Ten new-born rats were divided into 2 groups, one exposed in the gaseous formaldehyde,the other, in fresh air, for 72 hours. The gases were released from an environmental chamber. The lungs were rapidly dissected from newborn rats after exposure, then the expression level of VR1 and G3PD were determined by RT-PCR. Results The expression of VR1 increased after exposure in 3. 0m...