Brugia malayi Adult Low Molecular Weight IgG4-Reactive Antigens Induce Differential Cytokine Response in Lymphocytes of Endemic Normal and Asymptomatic Microfilariae Carriers In Vitro
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To characterize putatively protective immune response in bancroftian filariasis, Th1/Th2 cytokine profile induced in peripheral blood mononuclear cells (PBMCs) of endemic normal (EN) and asymptomatic microfilaremic (ASM) individuals were studied using different molecular weight fractions of Brugia malayi adult soluble antigens (BmA), which are differentially recognized by IgG4 antibodies present in their sera. Infection free and putatively immune individuals living in a filaria endemic area were identified and included in the present study as EN only after careful longitudinal follow up for three years. It was observed that the low molecular weight antigens present in Fr4 and Fr5 induced differential cytokine response; EN individuals showed a strong Th1 bias whereas ASM individuals showed a strong Th2 bias even though both the groups produced Th1 cytokines, albeit of different quantity, when a nonhelminthic antigen like H37Rv whole cell lysate was used. Since antigens present in Fr5 induced a highly polarized response, they should be examined for their diagnostic potential in lymphatic filariasis.
KEY WORDS:bancroftian filariasis longitudinal follow up infection free endemic normal individual Brugia malayi adult soluble antigens IgG4-reactive antigen fraction differential Th1/Th2 cytokine response
Brugia malayi adult soluble antigens
counts per minute
circulating filarial antigen
asymptomatic microfilariae carriers
nitro cellulose membrane
peripheral blood mononuclear cells
sodium dodecyl sulfate polyacrylamide gel electrophoresis.
BPM is thankful to the Indian Council of Agricultural Research for the study leave. The work was supported by a grant from Department of Science and Technology, Government of India (No.100/(IFD)/224/2000-2003) to SKK and SMB.
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