The role of antibody in recovery from alphavirus encephalitis

Immunological Reviews
D E GriffinP Desprès

Abstract

Alphaviruses infect neurons in the brain and spinal cord and cause acute encephalomyelitis in a variety of mammals. The outcome of infection is determined by whether the neurons survive infection and this, in turn, is determined by the virulence of the virus and the age of the host at the time of infection. We have been studying Sindbis virus (SV) infection of mice as a model system for alphavirus-induced encephalomyelitis. Investigation of intracerebral infection of weanling mice with two different strains of SV has allowed us to analyze the role of the immune response in protection from fatal disease (virulent NSV strain) and in clearance of virus from the nervous system during non-fatal disease (less virulent SV AR339 strain). Neutralizing and non-neutralizing antibodies to the E1 and E2 surface glycoproteins can protect mice from fatal NSV infection when given before or after infection, while T cells are not protective. The mechanism of antibody-mediated protection is not known, but it is likely that more than one mechanism is involved and that different mechanisms are involved in pre-infection and post-infection treatment protection. Clearance of infectious virus from the nervous system of mice during recovery from non-fat...Continue Reading

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