In Vitro and In Vivo Induction of Neutrophil and Eosinophil Chemotactic Responses by Schistosoma japonicum Cercaria

Yoichiro Horii Department of Parasitology, Miyazaki Medical College, Miyazaki 889-16, Japan

Search for other papers by Yoichiro Horii in
Current site
Google Scholar
PubMed
Close
,
Akira Ishii Department of Parasitology, Miyazaki Medical College, Miyazaki 889-16, Japan

Search for other papers by Akira Ishii in
Current site
Google Scholar
PubMed
Close
, and
Makoto Owhashi Department of Parasitology, Miyazaki Medical College, Miyazaki 889-16, Japan

Search for other papers by Makoto Owhashi in
Current site
Google Scholar
PubMed
Close
Restricted access

High neutrophil and eosinophil chemotactic activities of soluble extract of Schistosoma japonicum cercariae (SjCe-ext) were detected in vitro by using blind-well chemotaxis chambers and Millipore filters in a dose-dependent manner. Low doses (total of 0.25 and 2.5 µg) of SjCe-ext induced significant neutrophilic infiltrations in normal and S. japonicum-infected (8 week) guinea pig tissues beginning at 2 hr after the intradermal injection. Eosinophilic responses were observed in the infected animals especially in early phase (2–8 hr post-injection of SjCe-ext). SjCe-ext elicited strong immediate skin reactions (at 30 min) in the infected guinea pigs. Possible roles of these chemotactic activities and hypersensitivity reaction in S. japonicum infection are discussed.

Author Notes

Present address: Yoichiro Horii, Department of Medical Zoology, Nagasaki University School of Medicine, Sakamoto-machi, Nagasaki 852, Japan.

Present address: Akira Ishii, Department of Parasitology, Okayama University Medical School, Shikata-machi, Okayama 700, Japan.

Save