Previous studies of intestinal adaptation following resection have focused on the marked changes in small bowel morphology and nutrient transport that characterize this phenomenon. Although clinically there is evidence to suggest that there are accompanying alterations in intestinal fluid and electrolyte transport, this has not been examined experimentally in any detail. The hypothesis underlying this application is that, following resection, the adaptation in intestinal fluid and electrolyte transport is of comparable magnitude and physiologic significance and that the mechanisms and magnitude of this response depend on both the segment of bowel examined and on a variety of luminal, systemic, and cellular mediators. To evaluate this, we plan a series of experiments, based on preliminary data employing a rat model of massive small bowel resection, to address the following specific aims: 1. To examine the' effects of adaptation on fluid and electrolyte transport in jejunum, ileum, and colon. 2. To identify the cellular transport mechanisms responsible for this functional change. 3. To begin to determine the molecular basis for this adaptation. 4. To examine the role of luminal contents in this response. 5. To evaluate the role of one specific neuroendocrine mediator, peptide YY, in this alteration in fluid and electrolyte transport. The results of these experiments should have considerable relevance clinically. Not only may they increase our understanding of recovery following intestinal resection but they should also find application to a variety of other clinical problems ranging from ileostomy diarrhea to recovery following small bowel transplantation.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
First Independent Research Support & Transition (FIRST) Awards (R29)
Project #
5R29DK047326-02
Application #
2146824
Study Section
Surgery and Bioengineering Study Section (SB)
Project Start
1994-08-15
Project End
1996-07-31
Budget Start
1995-08-01
Budget End
1996-07-31
Support Year
2
Fiscal Year
1995
Total Cost
Indirect Cost
Name
University of California Los Angeles
Department
Surgery
Type
Schools of Medicine
DUNS #
119132785
City
Los Angeles
State
CA
Country
United States
Zip Code
90095
Dunn, J C; Parungo, C P; Fonkalsrud, E W et al. (1997) Epidermal growth factor selectively enhances functional enterocyte adaptation after massive small bowel resection. J Surg Res 67:90-3
Whang, E E; Hines, O J; Reeve Jr, J R et al. (1997) Antisecretory mechanisms of peptide YY in rat distal colon. Dig Dis Sci 42:1121-7
Hines, O J; Bilchik, A J; McFadden, D W et al. (1995) Na+/H+ exchange mediates postprandial ileal water and electrolyte transport. Dig Dis Sci 40:774-80
Bilchik, A J; Hines, O J; Adrian, T E et al. (1995) Early regional expression and secretion of peptide YY and enteroglucagon after massive resection of small bowel. J Am Coll Surg 180:417-26