High Levels of Il-19 in Patients with Chronic Inflammatory Demyelinating Polyneuropathy

Immune-mediated neuropathies include some specific types such as acute and chronic inflammatory demyelinating polyneuropathy (AIDP and CIDP). Previous studies have demonstrated abnormal cellular or humoral immune responses in these conditions. Although aberrant regulation of several cytokines have been reported in AIDP and CIDP, the significance of interleukin 19 (IL-19) in these conditions have not been elucidated yet. In the current study, we assessed serum levels of IL-19 in 12 CIDP patients (female/male ratio, 4/8), 9 AIDP patients (female/male ratio, 3/6), and 27 normal subjects (female/male ratio. 8/19) using commercial ELISA kits. Notably, we detected higher levels of this cytokine in CIDP patients (136.4 +/- 8.57 ng/l) compared with both AIDP patients (93.89 +/- 2.26 ng/l) and controls (83.78 +/- 1.72 ng/l). However, the differences between AIDP patients and controls were not significant. The current study demonstrates the role of IL-19 in the pathogenesis of CIDP and potentiates this cytokine as a biomarker for this condition.