Importance of mast-cell-derived eosinophil chemotactic factor A on granuloma formation in murine Schistosomiasis japonica: evaluation using mast-cell-deficient W/WV mice.
The role of mast-cell-derived eosinophil chemotactic factor A (ECF-A) on eosinophil-rich periovular granuloma formation was examined by using mast-cell-deficient WBB6F1-W/WV mice infected with Schistosoma japonicum. The average size of granulomas formed around newly deposited eggs in the liver of W/WV mice was significantly smaller than that observed in control +/+ mice. The number of adult worms recovered or specific IgE titers were comparable between W/WV and +/+ mice. In contrast, immediate-type hypersensitivity response to specific antigen and dialyzable low-molecular weight ECF in the serum was detectable only in infected +/+ mice. When naive bone marrow eosinophils were incubated with the dialyzable fraction of infected +/+ mice sera, chemotactic reactivity of eosinophils to ECF derived from S. japonicum eggs was significantly enhanced, although that to synthetic ECF-A was depressed. Similar effects were observed when naive eosinophils were treated with synthetic ECF-A. The dialyzable fraction of infected W/WV mice sera had no such modulating effect on the chemotactic reactivity of eosinophils. These results suggest that an immediate-type hypersensitivity reaction is important in the formation of eosinophilic granulomas around S. japonicum eggs, mainly through the modulating effect of mast-cell-derived ECF-A on the chemotactic reactivity of eosinophils.
Owhashi
M
M
Department of Parasitology, Miyazaki Medical College, Japan.
Horii
Y
Y
Ikeda
T
T
Maruyama
H
H
Abe
T
T
Nawa
Y
Y
D000818:Animals; D000947:Antigens, Helminth / Q000276:immunology; D002631:Chemotactic Factors, Eosinophil / Q000502:physiology*; D005260:Female; D006099:Granuloma / Q000276:immunology*; D008407:Mast Cells / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D010063:Ovum / Q000276:immunology; D012554:Schistosomiasis japonica / Q000276:immunology*
D000947:Antigens, Helminth; D002631:Chemotactic Factors, Eosinophil