IL17A and asthma: However, there is also some evidence that elevated IL‐17A (Linden & Dahlen, 2014) increases the abundance of MMP‐9, an important tissue remodeling protein in asthma (Shaw et al., 2016) and late‐stage increases in IL‐17A concentration can induce apoptosis of neutrophils and eosinophils (Linden & Dahlen, 2014; Wang & Liu, 2008).