Interstitial edema, often associated with abdominal surgery or trauma, has been shown to cause intestinal dysfunction including decreased transit. Thus, intestinal edema development has significant negative impact on the outcome of ICU and post-surgical patients. Preliminary data suggests that edema disrupts signaling by the cell-cell adhesion molecule, cadherin. The general hypothesis is that edema induces tissue remodeling that leads to organ dysfunction. The goal is to investigate the effects of edema at the cellular and molecular level in order to understand the mechanism by which edema induces dysfunction. The specific hypothesis to be addressed in this proposal is that edema disrupts cadherin-mediated cell-cell contacts in intestinal smooth muscle causing a decrease in intestinal transit. The first specific aim is designed to examine the effects of intestinal edema on cadherin signaling in vivo using a venous hypertension rat model. The second specific aim is to correlate changes in cadherin signaling with changes in intestinal contractility in the rat intestinal edema model. In the third specifc aim, an intestinal smooth muscle cell culture model will be used to elucidate the role of cadherins in smooth muscle contraction. The fourth specific aim is designed to determine the mechanisms by which edema induces alterations in cadherins. The candidate will gain expertise in a relatively new area of cell adhesion while pursuing her long term research interests in fluid balance and microvascular research. The sponor and co-sponsors are experts in their respective fields and have proven track records in training young scientists. The research proposal and training plan will help the candidate establish an independent and complementary research program within the Microvascular Research Group. The KO1 award will facilitate the candidate's progression to independence by supporting the research training activities while the proposed research is being completed including mentoring by experts in the fields of intestinal function, smooth muscle biology, and cadherin/catenin signaling, attending research conferences relative to her area of research, and taking grant writing and ethics courses.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Scientist Development Award - Research & Training (K01)
Project #
5K01DK070758-05
Application #
7862458
Study Section
Diabetes, Endocrinology and Metabolic Diseases B Subcommittee (DDK)
Program Officer
Podskalny, Judith M,
Project Start
2006-07-01
Project End
2012-06-30
Budget Start
2010-07-01
Budget End
2012-06-30
Support Year
5
Fiscal Year
2010
Total Cost
$89,261
Indirect Cost
Name
University of Texas Health Science Center Houston
Department
Biology
Type
Schools of Medicine
DUNS #
800771594
City
Houston
State
TX
Country
United States
Zip Code
77225
Killoran, Kristin E; Miller, Amber D; Uray, Karen S et al. (2014) Role of innate immunity and altered intestinal motility in LPS- and MnCl2-induced intestinal intussusception in mice. Am J Physiol Gastrointest Liver Physiol 306:G445-53
Chu, Ji; Pham, Ngoc T; Olate, Nicole et al. (2013) Biphasic regulation of myosin light chain phosphorylation by p21-activated kinase modulates intestinal smooth muscle contractility. J Biol Chem 288:1200-13
Chu, J; Miller, C T; Kislitsyna, K et al. (2012) Decreased myosin phosphatase target subunit 1(MYPT1) phosphorylation via attenuated rho kinase and zipper-interacting kinase activities in edematous intestinal smooth muscle. Neurogastroenterol Motil 24:257-66, e109
Uray, Karen S; Shah, Shinil K; Radhakrishnan, Ravi S et al. (2011) Sodium hydrogen exchanger as a mediator of hydrostatic edema-induced intestinal contractile dysfunction. Surgery 149:114-25
Shah, Shinil K; Uray, Karen S; Stewart, Randolph H et al. (2011) Resuscitation-induced intestinal edema and related dysfunction: state of the science. J Surg Res 166:120-30
Shah, Shinil K; Xue, Hasen; Jimenez, Fernando et al. (2010) Evaluating the potential role of nitric oxide as a mediator of hydrostatic edema mediated intestinal contractile dysfunction. J Surg Res 163:102-9
Shah, Shinil K; Jimenez, Fernando; Walker, Peter A et al. (2010) A novel mechanism for neutrophil priming in trauma: potential role of peritoneal fluid. Surgery 148:263-70
Shah, Shinil K; Jimenez, Fernando; Walker, Peter A et al. (2010) A novel physiologic model for the study of abdominal compartment syndrome (ACS). J Trauma 68:682-9
Shah, Shinil K; Fogle, Lindsey N; Aroom, Kevin R et al. (2010) Hydrostatic intestinal edema induced signaling pathways: potential role of mechanical forces. Surgery 147:772-9
Uray, Karen S; Wright, Zachary; Kislitsyna, Karina et al. (2010) Nuclear factor-kappaB activation by edema inhibits intestinal contractile activity. Crit Care Med 38:861-70

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