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. 1991 Jul;88(1):231–238. doi: 10.1172/JCI115282

Immunoregulation in onchocerciasis. Functional and phenotypic abnormalities of lymphocyte subsets and changes with therapy.

D O Freedman 1, A Lujan-Trangay 1, C Steel 1, C Gonzalez-Peralta 1, T B Nutman 1
PMCID: PMC296024  PMID: 1829096

Abstract

To help define the immunoregulatory defects in patients with onchocerciasis, flow cytometric analysis of circulating lymphocyte subpopulations was performed in parallel with functional assays. No significant differences in CD4/CD8 ratios were seen when microfilariae-positive individuals from Guatemala were compared with Guatemalan controls. However, the infected individuals had significantly increased numbers of circulating CD4+CD45RA+ lymphocytes (mean 38.3%) when compared with controls (mean 16.0%). Coexpression of the activation marker HLA-DR was significantly increased on CD4+ cells from infected individuals. In contrast, no up-regulation of HLA-DR was seen on CD8+ or CD19+ cells. At 1 year after initiation of treatment with semiannual doses of the microfilaricide ivermectin, there were significant increases (P less than 0.05) in the percentage of CD4+CD45RA- cells, the percentage of CD4+HLA-DR+ cells, and mitogen-induced lymphokine production (IL-2, IL-4). Despite these changes, parasite-specific IL-2 and IL-4 production which had been undetectable before treatment did not manifest itself even by the 2-yr follow-up. Defects in the T-cell activation pathway in Onchocerca volvulus-infected individuals may thus exist at several independent points; a state of parasite antigen-specific tolerance appears to remain even after the relative reversal of other generalized immunoregulatory defects.

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Selected References

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