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Inhibition of ongoing immunoglobulin production by eosinophil cationic protein
H Kimata1, A Yoshida, C Ishioka
1Department of Pediatrics, Faculty of Medicine, Kyoto University Hospital, Japan.
Insights
Eosinophil cationic protein (ECP) inhibits immunoglobulin (Ig) production in human B cells but not proliferation. Interleukin-4 specifically reverses this ECP-induced inhibition, suggesting ECP
Area of Science:
- Immunology
- Cell Biology
Background:
- Eosinophil cationic protein (ECP) is a key mediator in allergic inflammation.
- The role of ECP in regulating B cell function, specifically immunoglobulin production and proliferation, requires further elucidation.
Purpose of the Study:
- To investigate the effects of ECP on immunoglobulin production and proliferation in human B cells.
- To determine the role of interleukin-4 (IL-4) in modulating ECP's effects on B cells.
Main Methods:
- Human lymphoblastoid cell lines (CBL and GM-1056) and tonsillar large activated B cells were utilized.
- Effects of ECP on Ig production and cell proliferation were assessed.
- The influence of IL-4 and other cytokines, along with specific blocking antibodies, were examined.
Main Results:
- ECP significantly inhibited Ig production in a dose-dependent manner in both cell lines and primary B cells, without affecting proliferation.
- ECP-induced inhibition was specific, confirmed by blockade with anti-ECP serum.
- IL-4 specifically reversed ECP-induced Ig production inhibition, an effect blocked by anti-IL-4 antibody; other cytokines had no reversing effect.
Conclusions:
- ECP plays a significant role in modulating B cell responses by inhibiting immunoglobulin production.
- IL-4 acts as a specific counter-regulator to ECP's inhibitory effects on Ig production.
- These findings highlight a novel regulatory mechanism in B cell function involving ECP and IL-4.
Abstract:
The effect of eosinophil cationic protein (ECP) upon ongoing immunoglobulin (Ig) production and proliferation in human B cells was studied. ECP inhibited Ig production by the human lymphoblastoid cell lines, CBL and GM-1056, in a dose-dependent fashion. In contrast, proliferation was not affected. This ECP-induced inhibition of Ig production was specific, since inhibition was blocked by anti-ECP serum but not by control serum. Interleukin (IL)-4 did not affect Ig production by CBL or GM-1056 cells; however, IL-4 reversed ECP-induced inhibition of Ig production and this reverse was blocked by anti-IL-4 antibody but not by control antibody. In contrast, other cytokines, including IL-1 beta, IL-2, IL-3, IL-5, IL-6, interferon (IFN)-alpha, and IFN-gamma, failed to reverse inhibition. ECP also inhibited spontaneous Ig production (IgM, IgG1, IgG2, IgG3, IgG4, and IgA) by tonsillar large activated B cells without affecting proliferation. This inhibition was also blocked by anti-ECP serum but not by control serum and was reversed by IL-4 specifically. These results indicate that ECP may play an important role in B cell responses.
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