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MUC1 in the relationship between inflammation and cancer in IBD

Beatty, Pamela Lynn (2006) MUC1 in the relationship between inflammation and cancer in IBD. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Patients with inflammatory bowel disease (IBD), a chronic inflammatory disease of the colon, have an increased incidence of colon cancer. This has led to the hypothesis that chronic inflammation causes malignant transformation and promotes tumor progression. However, an alternative hypothesis can be made that everything starts with early malignant lesions, which activate innate but not adaptive immunity thus driving chronic inflammation. This imbalance between the innate and the adaptive immunity at the intestinal site may speed up colon cancer progression. To test this hypothesis we are examining development of colonic inflammation and associated colon cancer from the perspective of de novo expression of the tumor antigen MUC1 in both settings and innate and adaptive immune responses against it.We have created an animal model that recapitulates de novo MUC1 expression in human IBD by crossing IL10-/- mice that develop IBD and colon cancer, with human MUC1 transgenic mice that express MUC1 under its own promoter, thereby maintaining human tissue specific expression of this molecule. Mice were sacrificed at various time points and colonic tissue sections assessed for inflammatory and malignant changes and MUC1 expression. We found that, like in humans, expression of normal MUC1 as well as hypoglycosylated (tumor) MUC1 increases with the severity of inflammation in IBD. In other experiments, MUC1+/IL10-/- mice were vaccinated with TnMUC100mer, representing the hypoglycosylated (tumor) form of MUC1. MUC1-specific vaccination slows the progression to IBD as measured by rectal prolapse. Vaccinated animals, that develop rectal prolapse, have fewer tumors than unvaccinated animals. We have developed an animal model of MUC1+ IBD and colon cancer that mimics human disease. We show that MUC1-specific vaccination slows the progression to IBD and has a protective anti-tumor effect. We postulate that induction of MUC1-specific immunity, including effector and regulatory T-cells, restores the balance between adaptive and innate immunity, which resolves chronic inflammation and stops progression of premalignant lesions to cancer.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Beatty, Pamela Lynnbeatty1@pitt.eduBEATTY1
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairFinn, Olivera Jojfinn@pitt.eduOJFINN
Committee MemberHughey, Rebecca
Committee MemberSalter, Russellrds@pitt.eduRDS
Committee MemberPlevy, Scott
Committee MemberChambers, William
Date: 4 August 2006
Date Type: Completion
Defense Date: 15 June 2006
Approval Date: 4 August 2006
Submission Date: 18 July 2006
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: School of Medicine > Immunology
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: inflammation; inflammatory bowel disease; MUC1; tumor immunology; vaccines
Other ID:, etd-07182006-113506
Date Deposited: 10 Nov 2011 19:51
Last Modified: 15 Nov 2016 13:46


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