tokens: The facts that PMN influx was preceded by increased MIP-2 mRNA expression , suggesting that MIP-2 is involved in the development of NaVO3-induced pulmonary inflammation , whereas increased MIP-1alpha mRNA expression was followed by decreased AMs in BAL cells , suggesting AMs might be activated by MIP-1alpha , adherent to the lining surface of the airways and then resistant to be washed out .