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Journal of Cell Science, Vol 87, 315-322, Copyright © 1987 by Company of Biologists

Submitted on May 16, 1986
Accepted on November 20, 1986

Inhibition of stenotele differentiation by head tissue in Hydra

TOSHITAKA FUJISAWA 1

1 National Institute of Genetics Yata 1,111, Mishima, Shizuoka 411, Japan

Stenotele nematocytes in Hydra are differentiated predominantly in the proximal regions and in gradually decreasing numbers in the more distal regions of the body column. To test whether this position effect is directed by an inhibitory signal from head tissue or by a stimulatory signal from foot tissue, head or foot tissue was laterally grafted from one animal to different positions on another animal. Heads grafted to proximal positions strongly inhibited stenotele differentiation, while the foot exhibited no stimulatory effect. In addition, tissue from gastric regions showed intermediate levels of inhibition. Thus, the inhibitory signal appears to be distributed in a gradient along the body column from head to foot. During head regeneration, the inhibitory signal disappeared abruptly from the distal tip and reappeared rapidly. These results suggest that the inhibitory signal is involved in generating the regional pattern of stenotele differentiation. Head tissue from epithelial hydra, which lacks the interstitial cell lineage, also inhibited stenotele differentiation, suggesting that the inhibitory signal is localized in epithelial cells.

Key words: Hydra, stenotele differentiation, inhibition

Submitted on May 16, 1986
Accepted on November 20, 1986




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N Harafuji, T Takahashi, M Hatta, H Tezuka, F Morishita, O Matsushima, and T Fujisawa
Enhancement of foot formation in Hydra by a novel epitheliopeptide, Hym-323
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[Abstract] [PDF]


© The Company of Biologists Ltd 1987