“…In the case of asthma the pathogenic role of the CCL17/CCL22-CCR4 axis is still controversial (Pease, 2006), as some reports demonstrate efficient improvement of disease symptoms after CCR4 or CCL17 blockade (Kawasaki et al, 2001;Perros et al, 2009;Vijayanand et al, 2010), whereas others do not ( Chvatchko et al, 2000;Conroy et al, 2003). As already mentioned above, enhanced expression of CCL17 and CCL22 has also been observed in allergic contact dermatitis (Bäumer et al, 2004;Goebeler et al, 2001;Kamsteeg et al, 2010;Martín et al, 2002), and contact hypersensitivity responses were significantly inhibited in CCL17-deficient mice (Alferink et al, 2003). Regarding nonallergic diseases, CCL17 has recently been shown to enhance the formation of artherosclerotic lesions in mice by inhibition of Treg cell expansion (Weber et al, 2011).…”