Leptin-resistant obese mice have paradoxically low biliary cholesterol saturation

Khoi Q. Tran, Shannon J. Graewin, Deborah A. Swartz-Basile, Attila Nakeeb, Carol L. Svatek, Henry A. Pitt

Research output: Contribution to journalArticle

Abstract

Background. Human obesity is associated with leptin resistance, elevated serum glucose and lipids, hepatic steatosis, and cholesterol gallstone formation. These gallstones are thought to result from hypersecretion of biliary cholesterol as well as biliary stasis. Leptin-resistant Lep db obese mice, which are known to have elevated serum leptin, glucose, and lipids, as well as hepatic steatosis, should be an appropriate model for human gallstone formation. Therefore, we tested the hypothesis that leptin-resistant mice would have increased gallbladder volume, biliary cholesterol saturation, and cholesterol crystal formation. Methods. Sixty lean control mice and 60 Lepdb obese mice on a low cholesterol chow diet were studied. Gallbladder volumes were measured and bile was pooled to calculate cholesterol saturation index. Serum cholesterol, glucose, and leptin levels were determined from pooled serum. Hepatic fat vacuoles were counted. Bile from a second group of 90 lean control and 59 obese mice was observed microscopically for cholesterol crystal formation. Results. Leptin-resistant obese mice have significantly higher serum cholesterol, glucose, and leptin levels, hepatic fat vacuoles, and gallbladder volume than lean control mice. However, biliary cholesterol saturation index and cholesterol crystal formation were significantly diminished in the obese mice. Conclusions. These data suggest that leptin-resistant Lepdb obese mice have (1) increased gallbladder volume, (2) decreased biliary cholesterol saturation despite elevated serum cholesterol and hepatic steatosis, and (3) decreased in vitro cholesterol crystal formation. We conclude that the link between obesity and gallstone formation does not require hypersecretion of biliary cholesterol.

Original languageEnglish (US)
Pages (from-to)372-377
Number of pages6
JournalSurgery
Volume134
Issue number2
DOIs
StatePublished - Aug 1 2003
Externally publishedYes

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Obese Mice
Leptin
Cholesterol
Gallstones
Gallbladder
Serum
Liver
Glucose
Vacuoles
Bile
Obesity
Fats
Lipids
Cholestasis
Hypercholesterolemia

ASJC Scopus subject areas

  • Surgery

Cite this

Tran, K. Q., Graewin, S. J., Swartz-Basile, D. A., Nakeeb, A., Svatek, C. L., & Pitt, H. A. (2003). Leptin-resistant obese mice have paradoxically low biliary cholesterol saturation. Surgery, 134(2), 372-377. https://doi.org/10.1067/msy.2003.234

Leptin-resistant obese mice have paradoxically low biliary cholesterol saturation. / Tran, Khoi Q.; Graewin, Shannon J.; Swartz-Basile, Deborah A.; Nakeeb, Attila; Svatek, Carol L.; Pitt, Henry A.

In: Surgery, Vol. 134, No. 2, 01.08.2003, p. 372-377.

Research output: Contribution to journalArticle

Tran, KQ, Graewin, SJ, Swartz-Basile, DA, Nakeeb, A, Svatek, CL & Pitt, HA 2003, 'Leptin-resistant obese mice have paradoxically low biliary cholesterol saturation', Surgery, vol. 134, no. 2, pp. 372-377. https://doi.org/10.1067/msy.2003.234
Tran KQ, Graewin SJ, Swartz-Basile DA, Nakeeb A, Svatek CL, Pitt HA. Leptin-resistant obese mice have paradoxically low biliary cholesterol saturation. Surgery. 2003 Aug 1;134(2):372-377. https://doi.org/10.1067/msy.2003.234
Tran, Khoi Q. ; Graewin, Shannon J. ; Swartz-Basile, Deborah A. ; Nakeeb, Attila ; Svatek, Carol L. ; Pitt, Henry A. / Leptin-resistant obese mice have paradoxically low biliary cholesterol saturation. In: Surgery. 2003 ; Vol. 134, No. 2. pp. 372-377.
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abstract = "Background. Human obesity is associated with leptin resistance, elevated serum glucose and lipids, hepatic steatosis, and cholesterol gallstone formation. These gallstones are thought to result from hypersecretion of biliary cholesterol as well as biliary stasis. Leptin-resistant Lep db obese mice, which are known to have elevated serum leptin, glucose, and lipids, as well as hepatic steatosis, should be an appropriate model for human gallstone formation. Therefore, we tested the hypothesis that leptin-resistant mice would have increased gallbladder volume, biliary cholesterol saturation, and cholesterol crystal formation. Methods. Sixty lean control mice and 60 Lepdb obese mice on a low cholesterol chow diet were studied. Gallbladder volumes were measured and bile was pooled to calculate cholesterol saturation index. Serum cholesterol, glucose, and leptin levels were determined from pooled serum. Hepatic fat vacuoles were counted. Bile from a second group of 90 lean control and 59 obese mice was observed microscopically for cholesterol crystal formation. Results. Leptin-resistant obese mice have significantly higher serum cholesterol, glucose, and leptin levels, hepatic fat vacuoles, and gallbladder volume than lean control mice. However, biliary cholesterol saturation index and cholesterol crystal formation were significantly diminished in the obese mice. Conclusions. These data suggest that leptin-resistant Lepdb obese mice have (1) increased gallbladder volume, (2) decreased biliary cholesterol saturation despite elevated serum cholesterol and hepatic steatosis, and (3) decreased in vitro cholesterol crystal formation. We conclude that the link between obesity and gallstone formation does not require hypersecretion of biliary cholesterol.",
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