Research Papers: Immunology:
Myelin oligodendrocyte glycoprotein (MOG35-55)-induced experimental autoimmune encephalomyelitis is ameliorated in interleukin-32 alpha transgenic mice
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Jaesuk Yun1,*, Sun Mi Gu2,*, Hyung Mun Yun3, Dong Ju Son2, Mi Hee Park2, Moon Soon Lee4 and Jin Tae Hong2
1 Pharmacological Research Division, National Institute of Food and Drug Safety Evaluation (NIFDS), Ministry of Food and Drug Safety (MFDS), Osong-eup, Heungdeok-gu, Cheongju-si, Chungbuk, Republic of Korea
2 College of Pharmacy and Medical Research Center, Chungbuk National University, Osong-eup, Heungdeok-gu, Cheongju-si, Chungbuk, Republic of Korea
3 Department of Maxillofacial Tissue Regeneration, School of Dentistry and Research Center for Tooth and Periodontal Regeneration (MRC), Kyung Hee University, Dongdaemun-gu, Seoul, Republic of Korea
4 College of Agriculture, Life and Environmental Sciences, Chungbuk National University, Heungdeok-gu, Cheongju-si, Chungbuk, Republic of Korea
* These authors have contributed equally to this paper
Jin Tae Hong, email:
Moon Soon Lee, email:
Keywords: IL-32 alpha, experimental autoimmune encephalomyelitis, inflammation, multiple sclerosis, cytokines, Immunology and Microbiology Section, Immune response, Immunity
Received: August 14, 2015 Accepted: October 22, 2015 Published: November 11, 2015
Multiple sclerosis (MS), also known as disseminated sclerosis or encephalomyelitis disseminate, is an inflammatory disease in which myelin in the spinal cord and brain are damaged. IL-32α is known as a critical molecule in the pathophysiology of immune-mediated chronic inflammatory disease such as rheumatoid arthritis, chronic pulmonary disease, and cancers. However, the role of IL-32α on spinal cord injuries and demyelination is poorly understood. Recently, we reported that the release of proinflammatory cytokines were reduced in IL-32α-overexpressing transgenic mice. In this study, we investigated whether IL-32α plays a role on MS using experimental autoimmune encephalomyelitis (EAE), an experimental mouse model of MS, in human IL-32α Tg mice. The Tg mice were immunized with MOG35-55 suspended in CFA emulsion followed by pertussis toxin, and then EAE paralysis of mice was scored. We observed that the paralytic severity and neuropathology of EAE in IL-32α Tg mice were significantly decreased compared with that of non-Tg mice. The immune cells infiltration, astrocytes/microglials activation, and pro-inflammatory cytokines (IL-1β and IL-6) levels in spinal cord were suppressed in IL-32α Tg mice. Furthermore, NG2 and O4 were decreased in IL-32α Tg mice, indicating that spinal cord damaging was suppressed. In addition, in vitro assay also revealed that IL-32α has a preventive role against Con A stimulation which is evidenced by decrease in T cell proliferation and inflammatory cytokine levels in IL-32α overexpressed Jurkat cell. Taken together, our findings suggested that IL-32α may play a protective role in EAE by suppressing neuroinflammation in spinal cord.
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