The two most common forms of inflammatory bowel disease (IBD), Crohn's disease and ulcerative colitis, affect approximately 1.4 million people in the United States. The etiology of IBD is unclear, yet aberrant innate and adaptive immune responses directed towards the commensal microbiota are believed to underlie disease pathogenesis. Numerous pro-inflammatory factors contribute to disease severity and targeting some of these factors has proven effective in the treatment of IBD patients. TNF? in particular plays a crucial role as a pro- inflammatory mediator in the pathogenesis of IBD and the anti-TNF? monoclonal antibody, infliximab, is now successfully used in the clinic to treat human IBD. However, anti-TNF? therapy is only effective in a subset of IBD patients and concerns remain regarding adverse effects, such as cancer and opportunistic infections. The observed adverse effects are mainly due to the lack of targeted treatment and the ?over dosage? that is usually inherent to systemic drug administration. More recently, a monoclonal antibody targeting IL-12 and IL-23, ustekinumab, was shown to be effective in IBD patients, especially those in which anti-TNF? therapy had previously failed. Thus, treatment of human IBD may be optimized by novel delivery regimens that allow for targeted, low-dose inhibition of both TNF-? and IL-12/23. We have demonstrated that oral administration of nanoparticles loaded with TNF? siRNA and encapsulated in an alginate-chitosan hydrogel can be efficiently targeted to the colon without toxicity and reduce intestinal inflammation in a mouse model. Our exciting preliminary data demonstrate that specific targeting of nanoparticles containing siRNA to intestinal antigen presenting cells may enhance the beneficial effects of this novel therapeutic approach. In the course of these studies, we also discovered that inhibition of pro-inflammatory cytokines can have the unexpected side effect of inhibiting critical wound-healing factors, such as IL-22. These finding have led us to propose that nanoparticle-mediated manipulation of TNF?, IL-12/23 and IL-22 limits intestinal inflammation and promotes wound healing during IBD. These novel strategies aimed at locally inhibiting key pro-inflammatory cytokines while simultaneously promoting wound healing may contribute to the development of improved therapies for the treatment of human IBD.

Public Health Relevance

The present Multi-PI application will focus on defining specific factors and cells that may be targeted to treat IBD. We propose here an innovative central hypothesis that nanoparticle-mediated manipulation of TNF?, IL- 12/23 and IL-22 limits established intestinal inflammation and promotes wound healing during IBD. We will explore this hypothesis with state-of-the-art approaches employing siRNA nanoparticles that target key cytokines?in particular TNF? and/or IL-12/23?which are involved in the pathogenesis of IBD. Using complementary models of acute and chronic intestinal inflammation, we will further define which specific intestinal antigen-presenting cells should be targeted by nanoparticles and the beneficial effect of co-delivering IL-22 in order to promote wound healing. These studies will help to define novel biological functions of nanoparticle-mediated siRNA delivery during intestinal inflammation and have the potential to contribute meaningful new findings for the treatment of human IBD.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
1R01DK107739-01A1
Application #
9232271
Study Section
Gastrointestinal Mucosal Pathobiology Study Section (GMPB)
Program Officer
Perrin, Peter J
Project Start
2017-07-01
Project End
2021-04-30
Budget Start
2017-07-01
Budget End
2018-04-30
Support Year
1
Fiscal Year
2017
Total Cost
Indirect Cost
Name
Georgia State University
Department
Miscellaneous
Type
Organized Research Units
DUNS #
837322494
City
Atlanta
State
GA
Country
United States
Zip Code
30302
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