Extensive experimental work over the past four decades has led to a better understanding of acute and chronic pancreatitis at the morphological and biochemical level. However, these advances have not led to effective preventive and therapeutic strategies. The broad goal of this work is to better understand the pathophysiology of chronic pancreatitis at the molecular level in order to guide future preventive and therapeutic strategies. This goal will be accomplished by focusing on key extracellular events that lead to activation of the pancreatic stellate cell, the key mediator of pancreatic fibrogenesis.
The aims of this proposal represent logical extensions of the preliminary work undertaken by the principal investigator to develop a mouse model that recapitulates the morphological changes of chronic pancreatitis, develop the necessary tools to measure meaningful endpoints of pancreatic fibrogenesis, and seek novel genes expressed in the pancreas during repetitive injury.
The specific aims are to establish the role of angiotensin II and its receptors in the activation of pancreatic stellate cells and development of chronic pancreatitis and to establish the functional significance of thrombospondin-1 and thrombospondin-2 in the activation of pancreatic stellate cells during repetitive injury.
The first aim will be accomplished by using mice with genetic deletions of angiotensinogen and angiotensin II receptors as well as highly specific receptor antagonists in mice and cultured pancreatic stellate cells.
The second aim will be accomplished by using thrombospondin knockout mice to establish the role of thrombospondin-1 and thrombospondin-2 in pancreatic stellate cell activation. Accomplishing these aims will fill significant gaps in the understanding of chronic pancreatitis and this new knowledge may help identify effective treatment approaches to this disease. ? ?

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
5R01DK061992-02
Application #
6890890
Study Section
Special Emphasis Panel (ZRG1-GMA-3 (01))
Program Officer
Serrano, Jose
Project Start
2004-05-01
Project End
2008-04-30
Budget Start
2005-05-01
Budget End
2006-04-30
Support Year
2
Fiscal Year
2005
Total Cost
$258,720
Indirect Cost
Name
Saint Louis University
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
050220722
City
Saint Louis
State
MO
Country
United States
Zip Code
63103
Ulmasov, Barbara; Xu, Zekuan; Tetri, Laura H et al. (2009) Protective role of angiotensin II type 2 receptor signaling in a mouse model of pancreatic fibrosis. Am J Physiol Gastrointest Liver Physiol 296:G284-94
Neuschwander-Tetri, Brent A; Talkad, Vanita; Otis Stephen, F (2006) Induced thrombospondin expression in the mouse pancreas during pancreatic injury. Int J Biochem Cell Biol 38:102-9