Scientists Learning to Target Bacteria Where They Live (Biofilms)

[n2doc]

By Kari Lydersen
Washington Post Staff Writer
Monday, March 9, 2009; Page A05
CHICAGO -- In the arms race between humans and bacteria, the ability to form "biofilms" -- large aggregations of microbes embedded in a slimy matrix -- has been one of the weapons the organisms use to defeat the immune system, antibiotic drugs and other threats. But scientists, who only recently recognized the role that biofilms play in antibiotic resistance, may be closing in on promising prospects for defeating pathogens.

Scientists have learned that bacteria that are vulnerable when floating around as individual cells in what is known as their "planktonic state" are much tougher to combat once they get established in a suitable place -- whether the hull of a ship or inside the lungs -- and come together in tightly bound biofilms. In that state, they can activate mechanisms like tiny pumps to expel antibiotics, share genes that confer protection against drugs, slow down their metabolism or become dormant, making them harder to kill.

The answer, say researchers, is to find substances that will break up biofilms.

"Since the time of Pasteur, we've been working on trying to kill off and control planktonic bacteria, but we've made very little progress in the control and understanding of biofilm bacteria," said David Davies, a biofilm expert at the State University of New York at Binghamton. "Now we're very good at getting rid of acute bacterial infections, which used to be a real scourge of mankind, but we have this incredible number of chronic, debilitating bacterial infections" often linked to biofilms.

snip:
The March edition of the Journal of Bacteriology features Davies's research on forcing biofilm dispersion by using bacteria's own chemical signals against them. Biofilm colonies disperse naturally in response to environmental factors or to spread and form new colonies. Davies and his colleagues have discovered a chemical signal, in the form of a fatty acid, that tells bacteria it is time to break up.
more:

http://www.washingtonpost.com/wp-dyn/content/article/2009/03/08/AR2009030801778.html

[grannie4peace]

1. i have that stuff in my lungs since i had radiation treatments in 2001

maybe i can get in a study :)