To observe the efficacy of
San'ao Decoction(SAD) in diffusing the lung and relieving
asthma, and its intervention effect on the expression of transient receptor potential V2(TRPV2) during alleviating
asthma, this study replicated an
ovalbumin(OVA)-induced asthmatic mice model, and investigated the intervention effect of SAD on the airway
inflammation and
airway hyperresponsiveness. The regulatory mechanisms of SAD on the
mRNA and
protein expressions of TRPV2 in lung tissues and the levels of interleukin-4(IL-4),-10(IL-10),
nerve growth factor(
NGF),
prostaglandin D_2(
PGD_2) in bronchoalveolar lavage fluid(BALF) were discussed. Compared with the control group, the model group showed typical asthmatic phenotype, the level of eosinophils(EOS) in peripheral blood and BALF as well as the
airway hyperresponsiveness were increased(P<0.01), and pathological damage in lung tissue was serious. The
mRNA and
protein expressions of TRPV2 in lung tissue were increased significantly, while the levels of
IL-4,
IL-10,
NGF and
PGD_2 in BALF were elevated(P<0.05,P<0.01). SAD could relieve
bronchial asthma manifested as repaired lung patholo-gical changes(P<0.05), reduce the level of EOS in blood and BALF(P<0.05, P<0.01), and improve pulmonary resistance and lung compliance(P<0.05, P<0.01). SAD could also regulate the inflammatory
cytokine levels of
IL-4,
IL-10,
NGF,
PGD_2 in BALF, and reduce the gene and
protein expression of TRPV2 in the lung tissue(P<0.05, P<0.01). It is verified that SAD could reduce the
lung inflammation, and improve lung function in asthmatic mice. The regulatory mechanism of SAD on
asthma induced by OVA might be related to the regulation of TRPV2 expression and the induced decrease of Th2-related
cytokines and
neuropeptides, which provides the evidences for the treatment of
asthma with SAD.