Babu, Subash and Bhat, S Q and Kumar, Pavan and Lipira, A B and Kumar, Sanath and Karthik, C and Kumaraswami, V and Nutman, T B
(2009)
Filarial Lymphedema Is Characterized by Antigen-
Specific Th1 and Th17 Proinflammatory Responses and a
Lack of Regulatory T Cells.
PLOS Neglected Tropical Diseases, 3 (4).
pp. 1-9.
ISSN : 1935-2727; eISSN: 1935-2735
Abstract
Background: Lymphatic filariasis can be associated with development of serious pathology in the form of lymphedema,
hydrocele, and elephantiasis in a subset of infected patients.
Methods and Findings: To elucidate the role of CD4+ T cell subsets in the development of lymphatic pathology, we
examined specific sets of cytokines in individuals with filarial lymphedema in response to parasite antigen (BmA) and
compared them with responses from asymptomatic infected individuals. We also examined expression patterns of Toll-like
receptors (TLR1–10) and Nod-like receptors (Nod1, Nod2, and NALP3) in response to BmA. BmA induced significantly higher
production of Th1-type cytokines—IFN-c and TNF-a—in patients with lymphedema compared with asymptomatic
individuals. Notably, expression of the Th17 family of cytokines—IL-17A, IL-17F, IL-21, and IL-23—was also significantly
upregulated by BmA stimulation in lymphedema patients. In contrast, expression of Foxp3, GITR, TGFb, and CTLA-4, known
to be expressed by regulatory T cells, was significantly impaired in patients with lymphedema. BmA also induced
significantly higher expression of TLR2, 4, 7, and 9 as well Nod1 and 2 mRNA in patients with lymphedema compared with
asymptomatic controls.
Conclusion: Our findings implicate increased Th1/Th17 responses and decreased regulatory T cells as well as regulation of
Toll- and Nod-like receptors in pathogenesis of filarial lymphedema.
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