Atta AM, Carvalho EM, Jerônimo SMB, Sousa Atta MLB. Serum markers of rheumatoid arthritis in visceral leishmaniasis: rheumatoid factor and anti-cyclic citrullinated peptide antibody.
J Autoimmun 2007;
28:55-8. [PMID:
17257811 DOI:
10.1016/j.jaut.2006.12.001]
[Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2006] [Revised: 12/04/2006] [Accepted: 12/04/2006] [Indexed: 11/19/2022]
Abstract
Rheumatoid factor (RF) has been described in visceral leishmaniasis (VL). However, there is no report of RF-isotype or other rheumatoid arthritis (RA) autoantibody in VL. This work investigated RF and anti-cyclic citrullinated peptide antibody (CCP-Ab) in sera from 35 inhabitants from a VL area: 15 from healthy persons (HIEA); 10 from VL patients (VL), and 10 from subjects cured of VL (CVL). The controls were represented by sera from 15 healthy individuals (HI) and from 10 RA patients from a VL free area. IgM-RF was investigated by immunoturbidimetry, while IgA-RF and CCP-Ab by enzyme-linked immunosorbent assay (ELISA). Increased RF-IgM production was found in 9 out of 10 sera from both VL and RA groups (median level 100 and 182IU/ml respectively); in three out of CVL-sera (level 94IU), and in only one HIEA-serum (level 58IU). IgA-RF was only detected in RA-sera (5/10, 50%), while CCP-Ab was found in three VL and in four RA sera (median level 36.5U and 161.5U respectively). A strong correlation was observed between RF-IgM and VL in endemic area (P<0.0001). We concluded that an increased IgM-RF production associated with sporadic and moderate CCP-Ab synthesis is an autoimmune characteristic of VL.
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