A single layer of epithelial cells separates the intestinal lumen from the host's internal milieu. Clinically relevant foodborne pathogens may reside in the intestinal lumen in close contact with epithelial cells, adapt an intraepithelial cell lifestyle, or invade the epithelium as well as deeper layers of the intestinal mucosa and spread systemically. Despite these markedly different microbial lifestyles, and various mechanisms for causing host disease, a common feature of foodborne pathogens is their interaction with the host intestinal epithelium. Therefore understanding host intestinal epithelial cell responses to foodborne pathogens is central to the development of strategies to alter the host-pathogen interaction to the advantage of the host. The overall long-term goal of our studies is to define the repertoire and functional relevance of intestinal epithelial cell responses to foodborne pathogens. We hypothesize that intestinal epithelial cells express a relatively narrow repertoire of responses that are relevant to host innate and acquired immune defense following infection with foodborne pathogens. The proposed studies focus on three types of intestinal epithelial responses to foodborne pathogens that we consider will be particularly important for host innate and acquired defense. The three specific aims of the proposal are 1) to characterize the regulated expression and possible autocrine/paracrine function of intestinal epithelial cell expressed MIP-3alpha in the host response to foodborne pathogens; 2) To define epithelial cell apoptosis as an important host response to infection with foodborne pathogens; and 3) To define the regulated expression of antimicrobial peptides by human intestinal epithelial cells in response to epithelial cell infection with foodborne pathogens. These studies will use Salmonella as a model of an enteroinvasive foodborne pathogen, Cryptosporidium parvum as a model intraepithelial pathogen, and Escherichia coli O157:H7 as an intraluminal pathogen that lives in intimate association with the apical intestinal epithelial cell membrane. Our experimental approaches will draw on in vitro and in vivo model systems established in this laboratory and a duality of hypothesis and discovery based experimental approaches.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
5R01DK058960-04
Application #
6613868
Study Section
Special Emphasis Panel (ZDK1-GRB-1 (O1))
Program Officer
Hamilton, Frank A
Project Start
2000-09-30
Project End
2005-05-31
Budget Start
2003-08-01
Budget End
2004-05-31
Support Year
4
Fiscal Year
2003
Total Cost
$279,680
Indirect Cost
Name
University of California San Diego
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
804355790
City
La Jolla
State
CA
Country
United States
Zip Code
92093
Hirata, Yoshihiro; Broquet, Alexis H; Menchen, Luis et al. (2007) Activation of innate immune defense mechanisms by signaling through RIG-I/IPS-1 in intestinal epithelial cells. J Immunol 179:5425-32
Kagnoff, Martin F (2006) Microbial-epithelial cell crosstalk during inflammation: the host response. Ann N Y Acad Sci 1072:313-20
Chae, Sungwon; Eckmann, Lars; Miyamoto, Yukiko et al. (2006) Epithelial cell I kappa B-kinase beta has an important protective role in Clostridium difficile toxin A-induced mucosal injury. J Immunol 177:1214-20
AGA Institute (2006) AGA Institute Medical Position Statement on the Diagnosis and Management of Celiac Disease. Gastroenterology 131:1977-80
Miyamoto, Yukiko; Iimura, Mitsutoshi; Kaper, James B et al. (2006) Role of Shiga toxin versus H7 flagellin in enterohaemorrhagic Escherichia coli signalling of human colon epithelium in vivo. Cell Microbiol 8:869-79
Eckmann, Lars; Kagnoff, Martin F (2005) Intestinal mucosal responses to microbial infection. Springer Semin Immunopathol 27:181-96
Yang, Charles C; Ogawa, Hiroyuki; Dwinell, Michael B et al. (2005) Chemokine receptor CCR6 transduces signals that activate p130Cas and alter cAMP-stimulated ion transport in human intestinal epithelial cells. Am J Physiol Cell Physiol 288:C321-8
Egan, Laurence J; Eckmann, Lars; Greten, Florian R et al. (2004) IkappaB-kinasebeta-dependent NF-kappaB activation provides radioprotection to the intestinal epithelium. Proc Natl Acad Sci U S A 101:2452-7
Maaser, Christian; Egan, Laurence J; Birkenbach, Mark P et al. (2004) Expression of Epstein-Barr virus-induced gene 3 and other interleukin-12-related molecules by human intestinal epithelium. Immunology 112:437-45
Kim, Jae Gyu; Lee, Sung Joong; Kagnoff, Martin F (2004) Nod1 is an essential signal transducer in intestinal epithelial cells infected with bacteria that avoid recognition by toll-like receptors. Infect Immun 72:1487-95

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