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Disease-causing bacterial invaders aided by failure of immune system switch

Date:
February 27, 2014
Source:
Yale University
Summary:
Immune system defenses against dangerous bacteria in the gut can be breached by turning off a single molecular switch that governs production of the protective mucus lining our intestinal walls, according to a study. The walls of the intestine are shielded from potentially harmful bacteria by a thin mucus lining, which has been described as the body's demilitarized zone. The researchers found that production of this mucus lining depends upon a single immune system regulator that controls mucus secretion by cells in the wall of the intestine, just like turning on a faucet. When there is no mucus shield, the mice are unable to fend off invaders, and the intestinal wall becomes infected and inflamed, leaving the mice susceptible to conditions as diverse as inflammatory bowel diseases, colon cancer, Type 2 diabetes, obesity, and fatty liver disease.

Cells that lack key inflammasome cannot release the mucus granules (the small circular clusters) that protect intestinal wall from bacteria that cause a host of diseases.
Credit: Image courtesy of Yale University

Immune system defenses against dangerous bacteria in the gut can be breached by turning off a single molecular switch that governs production of the protective mucus lining our intestinal walls, according to a study led by researchers at Yale, the University of British Columbia, and the Weizmann Institute of Science.

"This gut microbiota has been linked to the inflammation that triggers obesity, diabetes, metabolic disease, and most of chronic health problems of the Western World," said Yale's Richard Flavell, Sterling Professor of Immunobiology, Howard Hughes Medical Institute investigator, and co-senior author of the paper appearing Feb. 27 in the journal Cell. "We knew these invaders were causing problems, but we didn't know how."

The walls of the intestine are shielded from potentially harmful bacteria by a thin mucus lining, which has been described as the body's demilitarized zone. The researchers found that production of this mucus lining depends upon a single immune system regulator -- the NLRP6 inflammasome -- that controls mucus secretion by cells in the wall of the intestine, just like turning on a faucet. In mice lacking the inflammasome, the faucet is closed, there is no mucus shield, and the mice are unable to fend off invaders. As a result, the intestinal wall becomes infected and inflamed, leaving the mice susceptible to conditions as diverse as inflammatory bowel diseases, colon cancer, Type 2 diabetes, obesity, and fatty liver disease. All these conditions stemmed from the bacterial invasion of the intestinal wall.

"The next step is to identify the bacteria in humans, prove that the system works the same way it does in mice, and figure out how to dial up the protective shield," Flavell said.


Story Source:

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


Journal Reference:

  1. Marta Wlodarska, ChristophA. Thaiss, Roni Nowarski, Jorge Henao-Mejia, Jian-Ping Zhang, EricM. Brown, Gad Frankel, Maayan Levy, MeiravN. Katz, WilliamM. Philbrick, Eran Elinav, B.Brett Finlay, RichardA. Flavell. NLRP6 Inflammasome Orchestrates the Colonic Host-Microbial Interface by Regulating Goblet Cell Mucus Secretion. Cell, 2014; 156 (5): 1045 DOI: 10.1016/j.cell.2014.01.026

Cite This Page:

Yale University. "Disease-causing bacterial invaders aided by failure of immune system switch." ScienceDaily. ScienceDaily, 27 February 2014. <www.sciencedaily.com/releases/2014/02/140227125251.htm>.
Yale University. (2014, February 27). Disease-causing bacterial invaders aided by failure of immune system switch. ScienceDaily. Retrieved July 29, 2014 from www.sciencedaily.com/releases/2014/02/140227125251.htm
Yale University. "Disease-causing bacterial invaders aided by failure of immune system switch." ScienceDaily. www.sciencedaily.com/releases/2014/02/140227125251.htm (accessed July 29, 2014).

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