“…Moreover elevated levels of cytokines such as tumor necrosis factor alpha (Tnf-α), interleukin 6 (Il-6), interleukin 1 beta and interferon gamma (Ifn-γ) have been observed in the SNpc of PD patients and rodents treated with 6-OHDA and MPTP ,Nagatsu et al, 2000,Nagatsu and Sawada, 2005,Sriram et al, 2006b. Therefore, these molecules may be actively involved in disease progression.Several studies also sought to correlate polymorphisms in the promoters of several cytokine genes to the risk of developing PD (Nishimura et al, 2000,Schulte et al, 2002,Nishimura et al, 2003,Huerta et al, 2004,Ross et al, 2004,Hakansson et al, 2005. Furthermore, retrospective clinical studies in populations subjected to chronic use of non steroidal antiinflammatory drugs (NSAIDs) suggest that some of these agents could lower the incidence of PD (Chen et al, 2003,Schiess, 2003,Hernan et al, 2006.…”