Adipose Secretory Function in Patients Before & After Laparoscopic Surgery

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00495599
Recruitment Status : Completed
First Posted : July 3, 2007
Last Update Posted : November 21, 2016
Information provided by (Responsible Party):
Vanderbilt University

July 2, 2007
July 3, 2007
November 21, 2016
March 2006
November 2009   (Final data collection date for primary outcome measure)
The primary endpoint of the study is change in mRNA levels of Visfatin. [ Time Frame: Levels of Visfatin will be assayed from fat tissue taken before and after gastric bypass surgery or other laparoscopic surgery. ]
Same as current
Complete list of historical versions of study NCT00495599 on Archive Site
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Adipose Secretory Function in Patients Before & After Laparoscopic Surgery
Adipose Secretory Function in Patients Before & After Laparoscopic Surgery
The central hypothesis of our study is that metabolic and hemodynamic improvements following gastric bypass surgery are mediated by downregulation of inflammation-related adipokines produced by the intra-abdominal adipose tissue such as Visfatin.

Central obesity represents a major risk for the development of type 2 diabetes and cardiovascular complications. Obesity is often associated with insulin resistance and abnormal production of inflammatory cytokines. Adipose tissue and especially omentum (adipocytes and resident macrophages) release several cytokines. Visfatin corresponds to a protein identified previously as pre-B cell colony-enhancing factor (PBEF), a 52-kilodalton cytokine expressed in lymphocytes. [1] Visfatin exerted insulin-mimetic effects in cultured cells and lowered plasma glucose levels in mice. Mice heterozygous for a targeted mutation in the visfatin gene had modestly higher levels of plasma glucose relative to wild-type littermates. Surprisingly, visfatin binds to and activates the insulin receptor.

Adipose tissue protein and mRNA expression of Visfatin (PBEF) has not been investigated in a single study design with regard to the relationship to fat distribution, insulin resistance and other metabolic risk factors, especially in morbidly obese individual undergoing weight loss surgery. Therefore, we propose the following specific aims: Investigate the protein and mRNA expression of Visfatin (PBEF) in the peripheral (subcutaneous) and visceral (omentum) adipose tissues of morbidly obese subjects and their relationships to the changes in body composition, fat distribution, insulin sensitivity and time-dependent reversal of co-morbidities following gastric bypass surgery.

Phase 3
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Procedure: Cytokines assessed from fat tissue
Cytokines assessed from fat tissue
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*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
December 2009
November 2009   (Final data collection date for primary outcome measure)

Inclusion Criteria:

  • Patients with a BMI < 35undergoing laparoscopic surgery;
  • Patients undergoing bariatric surgery with a BMI >35kg/m2; and
  • Those patients who have had gastric by-pass that require additional surgical procedures are eligible for this research protocol.

Exclusion Criteria:

  • Unwilling to consent.
Sexes Eligible for Study: All
18 Years to 65 Years   (Adult)
Contact information is only displayed when the study is recruiting subjects
United States
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Vanderbilt University
Vanderbilt University
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Principal Investigator: Alfonso Torquati, M.D. Vanderbilt University Medical Center
Vanderbilt University
November 2016

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP