Inflammatory bowel disease results from a loss of homeostasis, or balance, between the immune system and the microbes that inhabit the intestine. “In this study, we identified two microbes that instigate gut inflammation that leads to inflammatory bowel disease in mice,” said lead investigator Wendy Garrett, assistant professor of immunology and infectious diseases at HSPH. “We show using both metagenomic and conventional culture techniques that an individual’s genetic background influences what bacteria reside within his or her intestine. Several studies are currently underway examining the intestinal microbial communities of patients with IBD and we are looking forward to exploring the role of the Enterobacteriaceae we have identified in patients with IBD.”
The study appears in the September 16, 2010, edition of Cell Host & Microbe.
IBD is a chronic inflammatory disorder that afflicts 1.4 million persons in the US and the incidence is rising around the world. Not only is IBD a devastating and debilitating chronic illness, it is also one of the three highest risk factors for the development of colorectal cancer. There are two principal forms of IBD: Crohn’s disease and ulcerative colitis. Approximately 30,000 new IBD cases are diagnosed each year in the U.S.
Whether IBD is caused by individual species of bacteria or disruptions of entire microbial communities remains controversial, said senior author Laurie Glimcher, Irene Heinz Given Professor of Immunology at HSPH. “Our findings suggest that answer bridges both hypotheses–specific species of bacteria (Klebsiella pneumoniae and Proteus mirabilis) appear to work in concert with the indigenous gut microbial community to cause IBD.”
This work was supported by the National Institutes of Health, Danone Research and the Crohn’s and Colitis Foundation of America, plus career development awards from the Burroughs Wellcome Fund and the NIH.
“Enterobacteriaceae Act in Concert with the Gut Microbiota to Induce Spontaneous and Maternally Transmitted Colitis,” Wendy S. Garrett, Carey A. Gallini, Tanya Yatsunenko, Monia Michaud, Andrea DuBois, Mary L. Delaney, Shivesh Punit, Maria Karlsson, Lynn Bry, Jonathan N. Glickman, Jeffrey I. Gordon, Andrew B. Onderdonk, and Laurie H. Glimcher, Cell Host & Microbe 8, 292–300, September 16, 2010.
For more information:
photo: Dorothy Zhang and Wendy Garrett
Harvard School of Public Health (http://www.hsph.harvard.edu ) is dedicated to advancing the public’s health through learning, discovery, and communication. More than 400 faculty members are engaged in teaching and training the 1,000-plus student body in a broad spectrum of disciplines crucial to the health and well being of individuals and populations around the world. Programs and projects range from the molecular biology of AIDS vaccines to the epidemiology of cancer; from risk analysis to violence prevention; from maternal and children’s health to quality of care measurement; from health care management to international health and human rights. For more information on the school visit: http://www.hsph.harvard.edu