The critical role of the intestine in total body irradiation injury is an established principle of radiation biology. Acute radiation injury targets rapidly dividing cells prominently those in the bone marrow and intestine; however, it is the intestine, which likely determines the effectiveness of radiation mitigators. The failure of sustained intestinal recovery leads to breakdown of the intestinal barrier, bacterial entry into the bloodstream, infection, sepsis and death. Despite decades of research, the role of intestinal stem cells in the recovery and maintenance of the intestinal barrier function from radiation injury is still not understood. The GI epithelium has the fastest renewal rate in an adult mammal and is driven by the intestinal stem cells (ISCs), whose maintenance and activation is critically regulated by their niche. Our preliminary data indicated that TBI rapidly induces damage in the ISCs, ISC niche, intestinal differentiation and barrier, and our novel CMCR mitigators suppress TBI-induced intestinal damage. Our published work has demonstrated that cell death and cell cycle kinetics plays a key role in intestinal recovery from TBI. The central hypothesis of this project is that successful radiation mitigation suppresses irreparable GI damage and ?radiation disease? by preventing ISC dysfunctions through modulation of cell death and cell cycle kinetics. Project 4 will use novel laboratory tools, including in vivo and in vitro intestinal culture models, molecular and imaging analyses, and system biology, to define the role of intestinal stem cell-intrinsic and niche-based mechanisms of these novel mitigators. SA1. Establish intestinal stem cells as a key target of radiation mitigation. SA2. Define the mechanisms of radiation mitigation by preventing ISC dysfunctions. SA3. Investigate the actions of radiation mitigators in isolated ISCs and 3D intestinal culture. We believe that successful completion of these aims will provide novel mechanistic insights to the pathophysiology of the ?radiation disease?. This will help us understand the basis of mitigating agents already developed in the CMCR and new agents in Project 2 (Valerian Kagan, Ph.D., P.I.) and Project 3 (Hulya Bayir, M.D., P.I.) with single agents, and sequential delivery of different classes of agents in Project 1 (Joel S. Greenberger, M.D., P.I.). This project will discover new radiation mitigators in collaboration with Core C Radiobiological Standardization (Michael Epperly, Ph.D.) and Core B Innovative Medicinal Chemistry (Peter Wipf, Ph.D./Detcho Stoyanovsky, Ph.D., Co-PIs) by specifically targeting ISCs.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Program--Cooperative Agreements (U19)
Project #
5U19AI068021-15
Application #
9757677
Study Section
Special Emphasis Panel (ZAI1)
Project Start
Project End
Budget Start
2019-09-01
Budget End
2020-08-31
Support Year
15
Fiscal Year
2019
Total Cost
Indirect Cost
Name
University of Pittsburgh
Department
Type
DUNS #
004514360
City
Pittsburgh
State
PA
Country
United States
Zip Code
15260
Knickelbein, Kyle; Tong, Jingshan; Chen, Dongshi et al. (2018) Restoring PUMA induction overcomes KRAS-mediated resistance to anti-EGFR antibodies in colorectal cancer. Oncogene 37:4599-4610
Wei, Liang; Leibowitz, Brian J; Epperly, Michael et al. (2018) The GS-nitroxide JP4-039 improves intestinal barrier and stem cell recovery in irradiated mice. Sci Rep 8:2072
Christner, Susan; Guo, Jianxia; Parise, Robert A et al. (2018) Liquid chromatography-tandem mass spectrometric assay for the quantitation of the novel radiation protective agent and radiation mitigator JP4-039 in murine plasma. J Pharm Biomed Anal 150:169-175
Wang, Yi-Jun; Fletcher, Rochelle; Yu, Jian et al. (2018) Immunogenic effects of chemotherapy-induced tumor cell death. Genes Dis 5:194-203
Chen, Dongshi; Tong, Jingshan; Yang, Liheng et al. (2018) PUMA amplifies necroptosis signaling by activating cytosolic DNA sensors. Proc Natl Acad Sci U S A 115:3930-3935
Chen, Dongshi; Ni, Hong-Min; Wang, Lei et al. (2018) PUMA induction mediates acetaminophen-induced necrosis and liver injury. Hepatology :
Chao, Honglu; Anthonymuthu, Tamil S; Kenny, Elizabeth M et al. (2018) Disentangling oxidation/hydrolysis reactions of brain mitochondrial cardiolipins in pathogenesis of traumatic injury. JCI Insight 3:
Steinman, Justin; Epperly, Michael; Hou, Wen et al. (2018) Improved Total-Body Irradiation Survival by Delivery of Two Radiation Mitigators that Target Distinct Cell Death Pathways. Radiat Res 189:68-83
Lou, Wenjia; Ting, Hsiu-Chi; Reynolds, Christian A et al. (2018) Genetic re-engineering of polyunsaturated phospholipid profile of Saccharomyces cerevisiae identifies a novel role for Cld1 in mitigating the effects of cardiolipin peroxidation. Biochim Biophys Acta Mol Cell Biol Lipids 1863:1354-1368
Anthonymuthu, Tamil S; Kenny, Elizabeth M; Lamade, Andrew M et al. (2018) Oxidized phospholipid signaling in traumatic brain injury. Free Radic Biol Med 124:493-503

Showing the most recent 10 out of 203 publications