Abstract:
:Acute measles in children can be prevented by immunization with the live attenuated measles vaccine virus. Although immunization is able to induce CD4 and CD8 T cells as well as neutralizing antibodies, only the latter have been correlated with protective immunity. CD8 T cells, however, have been documented to be important in viral clearance in the respiratory tract, whereas CD4 T cells have been shown to be protective in a mouse encephalitis model. In order to investigate the CD4 T-cell response in infection of the respiratory tract, we have defined a T-cell epitope in the hemagglutinin (H) protein for immunization and developed a monoclonal antibody for depletion of CD4 T cells in the cotton rat model. Although the kinetics of CD4 T-cell development correlated with clearance of virus, the depletion of CD4 T cells during the primary infection did not influence viral titers in lung tissue. Immunization with the H epitope induced a CD4 T-cell response but did not protect against infection. Immunization in the presence of maternal antibodies resulted in the development of a CD4 T-cell response which (in the absence of neutralizing antibodies) did not protect against infection. In summary, CD4 T cells do not seem to protect against infection after immunization and do not participate in clearance of virus infection from lung tissue during measles virus infection. We speculate that the major role of CD4 T cells is to control and clear virus infection from other affected organs like the brain.
journal_name
J Viroljournal_title
Journal of virologyauthors
Pueschel K,Tietz A,Carsillo M,Steward M,Niewiesk Sdoi
10.1128/JVI.00160-07subject
Has Abstractpub_date
2007-08-01 00:00:00pages
8571-8issue
16eissn
0022-538Xissn
1098-5514pii
JVI.00160-07journal_volume
81pub_type
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