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What Protects Us From Sunburn Also Protects Crayfish Against Bacteria

Date:
September 28, 2007
Source:
Uppsala University
Summary:
The production of melanin in our skin helps protect us from the sun's rays, but it also helps protect invertebrate animals -- in their case, by encapsulating attacking fungi and parasites. Biologists can now show that melanin protects against bacterial infections, at least in crayfish.

A crayfish walks along the river rocks.
Credit: iStockphoto/Jason Lugo

The production of melanin in our skin helps protect us from the sun's rays, but it also helps protect invertebrate animals  -- in their case, by encapsulating attacking fungi and parasites. 

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Uppsala University researchers, in collaboration with Korean and Thai colleagues, can now show that melanin also protects against bacterial infections, at least in crayfish.

The production of melanin is an important protective reaction that gives us a suntan, for instance. In invertebrate animals it has long been observed that parasites, fungi, and other invaders become encapsulated in melanin. In many animals this can be seen as black-brown spots on the shell that show that the animal has had an infection.

"In mosquitoes that can harbor the malaria parasite it has also been observed that the mosquito΄s ability to form such melanin capsules often determines whether it will be able to spread the disease to humans," says Haipeng Liu.

On the other hand, the possible effect of melanin production on bacterial infections has been intensively debated. In the current study the scientists show, by manipulating the genetic expression of the melanin-producing enzyme, that effective melanin production is crucial to the ability of freshwater crayfish to survive an infection of an extremely dangerous bacteria for them, Aeromonas hydrophila.

"The findings indicate that we should upgrade the significance of the melanin reaction and that it may be worthwhile to search for further cases where it prevents bacterial growth," says Haipeng Liu.

 The study was recently published online in the Journal of Biological Chemistry.


Story Source:

The above story is based on materials provided by Uppsala University. Note: Materials may be edited for content and length.


Cite This Page:

Uppsala University. "What Protects Us From Sunburn Also Protects Crayfish Against Bacteria." ScienceDaily. ScienceDaily, 28 September 2007. <www.sciencedaily.com/releases/2007/09/070924162956.htm>.
Uppsala University. (2007, September 28). What Protects Us From Sunburn Also Protects Crayfish Against Bacteria. ScienceDaily. Retrieved October 26, 2014 from www.sciencedaily.com/releases/2007/09/070924162956.htm
Uppsala University. "What Protects Us From Sunburn Also Protects Crayfish Against Bacteria." ScienceDaily. www.sciencedaily.com/releases/2007/09/070924162956.htm (accessed October 26, 2014).

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