Ultrastructural evidence for eosinophil‐mediated destruction of Angiostrongylus cantonensis transferred into the pulmonary artery of non‐permissive hosts

Parasite Immunology - Tập 6 Số 2 - Trang 105-118 - 1984
Kazuya Yoshimura1, Kikue Uchida2, Keiko Sato1, Hiroshi Oya1
1*Department of Parasitology, Juntendo University School of Medicine, Hongo, Bunkyo‐ku, Tokyo, 113, Japan
2†Laboratory of Parasitology, Azabu University, School of Veterinary Medicine, Fuchinobe, Sagamihara-shi, Kanagawa-ken, 229, Japan

Tóm tắt

Summary Ultrastructural and cytochemical analyses were carried out on cellular reactions to the young adult worms of Angiostrongylus cantonensis surgically transferred into the pulmonary arteries of permissive (rat) and non‐permissive (rabbit and guinea‐pig) hosts. In permissive hosts, no appreciable cellular reactions could be found around worms throughout the course of the observations. By contrast, the infiltration of neutrophils along with eosinophils was observed around worms in non‐permissive hosts even at early stages (days 2 to 4). At day 7 and later, the prominent degranulation (solubilization of the whole granule or the matrix alone with preserved crystalloid, tubulovesicular structure formation, and vacuole formation containing lysosomal contents, etc.) of eosinophils, and subsequent release of the lysosomal contents on to the worm surface were noted. Discharge of large amounts of peroxidase on to the worm surface was also demonstrated. The worms were thus damaged and their cuticular fragments were frequently found removed. In addition to this, degenerative changes, such as lipid‐droplet and vacuole formations, were detectable in the hypodermis, somatic musculature and intestine of the parasites transferred into the non‐permissive hosts, as early as day 4 after transfer. These data suggest that eosinophils would serve as a potential effector cell for killing of pulmonary arterial A. cantonensis in non‐permissive hosts.

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Parasite Immunology

Tập 6 Số 2

105-118

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