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Publications (2)2.61 Total impact

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    ABSTRACT: To investigate the association between deficiencies of early components in the classical complement pathway and the development of SLE. Forty inbred C57BL/6J mice and 40 knockout C4 complement gene (C4KO) mice, which included 10 mice in each age group (2, 4, 6, and 8 months) were used. The enumeration of CD4+CD25+ Tregs frequencies in bone marrow, spleen and peripheral blood from both normal and C4KO groups were performed by flow cytometry. The expression levels of Foxp3 and TGF-beta in the same tested tissues were measured using real time PCR. The antinuclear antibodies (ANA) were semi-quantitatively measured using ELISA. We report decreased frequencies of CD4+CD25+ Tregs and reduced expression levels of Foxp3 and TGF-beta, which efficiently program the development and function of Tregs, in lymphoid tissues and peripheral blood of C4KO mice. In this study, C4KO mice have higher titers of ANA than those of normal mice. Higher frequencies of mice positive for ANA are also found in older mice. The deficiency of the C4 gene induces the decreased numbers of Tregs that further increase the production of ANA resulting in the development of an autoimmune disorder. The outcomes of our study help us to understand the association between the deficiency of C4 in the classical complement pathway and development of autoimmune disorder via the role of Tregs.
    Asian Pacific journal of allergy and immunology / launched by the Allergy and Immunology Society of Thailand 09/2011; 29(3):220-8. · 0.79 Impact Factor
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    ABSTRACT: The outer membrane protein LipL21, LipL32, LipL41 and Loa22 of Leptospira interrogans serovar Copenhageni were previously revealed by immunoproteomic analysis, using sera from acute phase infection in a guinea pig. The full-length DNA of each protein was then cloned from the same serovar and expressed in pRSET vector. The obtained molecular weight (MW) of recombinant proteins rLipL21, rLipL32 and rLoa22 were slightly higher than the MW predicted from nucleotide sequences of each inserted gene, while only the N-terminal half of rLipL41 was obtained. Mice antiserum raised against each purified recombinant protein could react with the whole cell lysate of leptospiral serovars, implying that leptospiral native proteins shared a common epitope with recombinant protein. Serodiagnosis using recombinant protein antigen based on indirect ELISA procedure was developed in this study. The optimization of the ELISA components lead to determination of optical density (OD) from a single serum-dilution of 1:1000 in the leptospirosis patients group and normal healthy control group. The cut off OD values for both IgG and IgM class were investigated, and based on this fixed dilution only the IgG class could be used for differential diagnosis of patients and normal individuals. Compared with the MAT assay, ELISA assay utilizing both rLipL32 and rLoa22 as antigen, gave high accuracy and could thus be useful as a confirmative serology test.
    Transactions of the Royal Society of Tropical Medicine and Hygiene 02/2011; 105(5):289-97. · 1.82 Impact Factor