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Ultraviolet absorbing compounds provide a rapid response mechanism for UV protection in some reef fish

Paper ID Volume ID Publish Year Pages File Format Full-Text
29603 44422 2016 8 PDF Available
Title
Ultraviolet absorbing compounds provide a rapid response mechanism for UV protection in some reef fish
Abstract

•Ultraviolet absorbing compounds (UVACs) and MAAs have been dubbed nature's sunscreens.•The efficiency of MAAs to protect against UV induced DNA damage is yet unknown.•We induced DNA damage in reef fish with variable UVACs in their external mucus.•Fish with more sunscreens in their mucus had less DNA damage in skin samples.•An increase in mucus absorption when exposed to UV radiation was observed in one species.

The external mucus surface of reef fish contains ultraviolet absorbing compounds (UVAC), most prominently Mycosporine-like Amino Acids (MAAs). MAAs in the external mucus of reef fish are thought to act as sunscreens by preventing the damaging effects of ultraviolet radiation (UVR), however, direct evidence for their protective role has been missing. We tested the protective function of UVAC's by exposing fish with naturally low, Pomacentrus amboinensis, and high, Thalassoma lunare, mucus absorption properties to a high dose of UVR (UVB: 13.4 W ∗ m− 2, UVA: 6.1 W ∗ m− 2) and measuring the resulting DNA damage in the form of cyclobutane pyrimidine dimers (CPDs). For both species, the amount of UV induced DNA damage sustained following the exposure to a 1 h pulse of high UVR was negatively correlated with mucus absorbance, a proxy for MAA concentration. Furthermore, a rapid and significant increase in UVAC concentration was observed in P. amboinensis following UV exposure, directly after capture and after ten days in captivity. No such increase was observed in T. lunare, which maintained relatively high levels of UV absorbance at all times. P. amboinensis, in contrast to T. lunare, uses UV communication and thus must maintain UV transparent mucus to be able to display its UV patterns. The ability to rapidly alter the transparency of mucus could be an important adaptation in the trade off between protection from harmful UVR and UV communication.

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Keywords
Ultraviolet absorbing compounds; Mycosporine-like amino acids; DNA damage; UV radiation; Reef fish; Sunscreens; Pomacentrus amboinensis
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Ultraviolet absorbing compounds provide a rapid response mechanism for UV protection in some reef fish
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 160, July 2016, Pages 400–407
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us