title: Anti-inflammatory activity of intravenous immunoglobulins protects against West Nile virus encephalitis.
abstract: West Nile virus (WNV), an important global human pathogen, targets neurons to cause lethal encephalitis, primarily in elderly and immunocompromised patients. Currently, there are no approved therapeutic agents or vaccines to treat WNV encephalitis. Recent studies have suggested that inflammation is a major contributor to WNV encephalitis morbidity. In this study we evaluated the use of IVIG (intravenous immunoglobulins - a clinical product comprising pooled human IgG) as an anti-inflammatory treatment in a model of lethal WNV infection. We report here that IVIG and pooled human WNV convalescent sera (WNV-IVIG) inhibited development of lethal WNV encephalitis by suppressing central nervous system (CNS) infiltration by CD45(high) leukocytes. Pathogenic Ly6C(high) CD11b(+) monocytes were the major infiltrating subset in the CNS of infected control mice, whereas IVIG profoundly reduced infiltration of these pathogenic Ly6C(high) monocytes into the CNS of infected mice. Interestingly, WNV-IVIG was more efficacious than IVIG in controlling CNS inflammation when mice were challenged with a high-dose inoculum (10(5) versus 10(4) p.f.u.) of WNV. Importantly, adsorption of WNV E-glycoprotein neutralizing antibodies did not abrogate IVIG protection, consistent with virus neutralization not being essential for IVIG protection. These findings confirmed the potent immunomodulatory activity of generic IVIG, and emphasized its potential as an effective immunotherapeutic drug for encephalitis and other virus induced inflammatory diseases.
authors: Department of Virology, Beckman Research Institute of City of Hope, Duarte, CA 91010-3000, USA.
authors: Ruchi
authors: R
authors: Srivastava
authors: Department of Virology, Beckman Research Institute of City of Hope, Duarte, CA 91010-3000, USA.
authors: Chandran
authors: C
authors: Ramakrishna
authors: Department of Virology, Beckman Research Institute of City of Hope, Duarte, CA 91010-3000, USA.|Department of Neurology, Beckman Research Institute of City of Hope, Duarte, CA 91010-3000, USA.|Department of Immunology, Beckman Research Institute of City of Hope, Duarte, CA 91010-3000, USA.
authors: Edouard
authors: E
authors: Cantin
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000008:administration & dosage*; D001921:Brain / Q000473:pathology; D004195:Disease Models, Animal; D006801:Humans; D016756:Immunoglobulins, Intravenous / Q000008:administration & dosage*; D008807:Mice, Inbred BALB C; D018345:Mice, Knockout; D009000:Monocytes / Q000276:immunology; D016019:Survival Analysis; D016896:Treatment Outcome; D014901:West Nile Fever / Q000517:prevention & control*; D014902:West Nile virus / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral; D016756:Immunoglobulins, Intravenous