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American Zoologist 1975 15(1):7-11; doi:10.1093/icb/15.1.7
© 1975 by The Society for Integrative and Comparative Biology
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Transplantation Immunity in Annelids. III. Effects of Temperature on Xenograft Rejection in Earthworms

EDWIN L. COOPER and LARRY A. WINGER
Department of Anatomy, School of Medicine, Center for the Health Sciences, University of California Los Angeles, California 90024

Earthworms are capable of destroying body wall xenografts. Xenografts transplanted Eisenia foetida{leftrightarrow}Lumbricus terrestris at various temperatures showed that graft survival time is inversely proportional to temperature in both cases. Colder temperatures slow graft rejection, but higher temperatures, up to optimal limits, accelerate graft destruction. At 21 C, Eisenia grafts on Lumbricus hosts are rejected faster than at any other experimental temperature; the variability in individual times is lessened. Beginning at 23 C sub-optimal conditions are approached. Thus, graft survival times are more prolonged. Lumbricus grafts on Eisenia hosts are rejected most quickly at 23 C; at 27 C all Eisenia are dead. A review of the earthworm's general thermal dependence is presented and a rationalization for prolonged second-set graft survival (negative memory) at low temperatures is given. Temperature effects probably account for the lack of positive memory at 15 C from previous studies.


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