NGF and asthma: Investigationrecently found that increased NGF in asthma could induce functional redundancy ofrat AMCC, which resulting in transforming them into sympathetic neurons, andsignificantly reduced the synthesis and release of EPI, unbalancing bronchialcontraction and relaxation[14], [15].Our works found that high NGF level in asthma maternalserum and the morphology and function of AMCC in ONP rats were more worsemaintained,which revealed that high concentrations of NGF exposure during pregnancymay initiate the transformation of AMCC into neurons in offspring rats.