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First published online January 5, 2005
Journal of Experimental Biology 208, 383-390 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01394

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Redox signaling in colonial hydroids: many pathways for peroxide

Neil W. Blackstone^*, Matthew J. Bivins, Kimberly S. Cherry, Robert E. Fletcher and Gabrielle C. Geddes

Department of Biological Sciences, Northern Illinois University, DeKalb, IL 60115 USA

View larger version (43K): [in a new window]   Fig. 1. Images of genetically identical colonies of P. carnea growing on 18 mm diameter glass cover slips near the time of covering the surface. (A) Control; (B) treated with 100 µmol l-1 vitamin C. Polyps are bright and circular, while stolons are darker and web-like.

View larger version (15K): [in a new window]   Fig. 2. Mean ± S.E.M. of the average size of the areas of empty cover slip within the colonies (`inner area') for the control colonies (unfilled bars) and colonies treated with 100 µmol l-1 vitamin C (filled bars).

View larger version (33K): [in a new window]   Fig. 3. Images of genetically identical colonies of P. carnea growing on 18 mm diameter glass cover slips near the time of covering the surface. (A) Control; (B) treated with 0.1 mg ml-1 catalase.

View larger version (5K): [in a new window]   Fig. 4. Mean ± S.E.M. of the average size of the areas of empty cover slip within the colonies (`inner area') for the control colonies (filled bars) and colonies treated with 0.1 mg ml-1 catalase (unfilled bars).

View larger version (20K): [in a new window]   Fig. 5. Mean ± S.E.M. of the average size of the areas of empty cover slip within the colonies (`inner area') for the control colonies (filled bars) and colonies treated with 20-50 µmol l-1 hydrogen peroxide (unfilled bars).

View larger version (17K): [in a new window]   Fig. 6. Mean ± S.E.M. luminance (grayscale from 0-4095) for three polyp-stolon junctions per replicate colony treated with H2DCFDA (unfilled bars, controls; filled bars, 100 µmol l-1 vitamin C).

View larger version (14K): [in a new window]   Fig. 7. Mean ± S.E.M. luminance (grayscale from 0-4095) for three peripheral stolon tips per replicate colony treated with H2DCFDA (filled bars, controls; unfilled bars, 100 µmol l-1 vitamin C).

View larger version (13K): [in a new window]   Fig. 8. Mean ± S.E.M. luminance (grayscale from 0-4095) for three peripheral stolon tips per replicate colony treated with H2DCFDA. Unfilled bars represent the foreground luminance of the stolon tip; filled bars represent the background luminance of the surrounding area. (A) Controls; (B) 0.1 mg ml-1 catalase. Colonies were imaged in a chamber containing plain seawater immediately after being removed from the treatment solution.

View larger version (16K): [in a new window]   Fig. 9. Mean ± S.E.M. luminance (grayscale from 0-4095) for three peripheral stolon tips per replicate colony treated with H2DCFDA (unfilled bars, treated with 20-50 µmol l-1 peroxide; filled bars, controls).

View larger version (15K): [in a new window]   Fig. 10. Luminance (grayscale from 0-4095) for two stolon tips per replicate colony treated with H2DCFDA. A central stolon tip (unfilled bar) is compared with a peripheral stolon tip (filled bar) for each colony.

View larger version (17K): [in a new window]   Fig. 11. Mean ± S.E.M. luminance (grayscale from 0-4095) for three peripheral stolon tips per replicate colony treated with H2DCFDA (unfilled bars, E. viridula; filled bars, P. carnea).

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