The Ewha Medical Journal
Ewha Womans University School of Medicine
Original Article

Effects of rIFN-γ on Serum IgE and the Number of Pheripheral Blood Eosinophils in Mice Infected with Paragonimus westermani

Myeong Heon Shin

Copyright ⓒ 1997. Ewha Womans University School of Medicine. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Published Online: Jul 24, 2015

Abstract

Objective

Elevated serum lgE and pheripheral blood eosinophilia are immunologic hallmark in helminthic infections. Recently, these responses are known to be regulated by Th2-specific cytokine IL-4 and IL-5, respectively. And also, the antagonistic effects of IFN-γ on Th2 cell proliferation were shown in vitro. However, few studies on the effect of IFN-γ on Th2 cytokine responses in Paragonimus westermani infection are reported, In this study, effects of rIFN-γ on serum lgE production and the number of pheripheral blood eosinophils in mice infected with P.westermani were examined.

Methods

5-6week old male BALB/c mice treated with IFN-γ were divided into 3 groups. All the mice were inoculated orally with 20 metacercariae of P.westermani. GroupImice(0-14days) were treated intraperitoneally with 2×103 unit of rIFN-γ at daily intervals from the time of the infection to 4th day infection, group II mice(5-14 days) were treated with rIFN-γ from the 5th to the 14th day of infection and group III mice(8-14 days) were treated from the 8th to the 14th of infection. Total serum lgE and the number of pheripheral blood eosinophils were examined in infected mice treated with rIFN-γ.

Results

The serum lgE levels in groupIand II were decreased compared with those of infected mice with no treatment with rIFN-γ, but not significantly. The number of pheripheral blood eosinophils in group I and II were decreased compared with those of infected mice with no treatment with rIFN-γ, especially significant(p<0.05) reduction was shown in group I. However, the serum lgE levels and number of pheripheral blood eosinophils in group III were similar to those of infected mice with no treatment with rIFN-γ.

Conclusion

These results suggest that IFN-γ decreases Th2 cytokine response in P.westermani-infected mice. However, IFN-γ treatment has less of an effect once the production of Th2-associated cytokines has become established.

Keywords: rIFN-γ; IgE; Pheripheral blood eosinophils; Paragonimus westermani