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Self and nonself recognition in a marine sponge, Halichondria japonica (Demospongiae).

Authors
  • 1
  • 1 Shimoda Marine Research Center, University of Tsukuba, Shizuoka, Japan. [email protected] , (Japan)
Type
Published Article
Journal
ZOOLOGICAL SCIENCE
0289-0003
Publisher
BioOne (Zoological Society of Japan)
Publication Date
Volume
30
Issue
8
Pages
651–657
Identifiers
DOI: 10.2108/zsj.30.651
PMID: 23915158
Source
Medline
License
Unknown

Abstract

The function of allogeneic recognition in a marine sponge, Halichondria japonica, was examined by use of cut pieces contact assay. Individuals of this species were able to distinguish an allogeneic individual from an autogeneic one, and showed rejection reactions against allogeneic individuals. There were two types of allogeneic rejection reaction: barrier formation at the contact area to separate from allogeneic individuals and necrosis with cytotoxic reactions at the contact area. In both types of rejection reactions, mesohyl cells accumulate at the contact area at the early stages of the rejection reaction. Fusion between two pieces of allogeneic individuals was very rare, and in most of combinations of allogeneic individuals rejection reactions appeared at the contact area. Xenogeneic rejections were also observed. Halichondria japonica showed rejection reaction against individuals of Halichondria okadai, but the intensity of rejection was less than that of allogeneic rejection.

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