Pioglitazone increases gallbladder volume in insulin-resistant obese mice.

Pioglitazone increases gallbladder volume in insulin-resistant obese mice. Research Abstract Details 

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Pioglitazone increases gallbladder volume in insulin-resistant obese mice. Abstract Text:

Hayder H Al-Azzawi,Abhishek Mathur,Debao Lu,Deborah A Swartz-Basile,Attila Nakeeb,Henry A Pitt,

BACKGROUND: Both obesity and diabetes are associated with an increased incidence of gallstones. Recent animal and human data from our laboratory suggest that insulin resistance is associated with increased gallbladder volume and/or impaired gallbladder emptying. Pioglitazone is a thiazolidinedione that has been shown to improve insulin resistance. Therefore, we tested the hypothesis that pioglitazone would improve insulin resistance, decrease resting gallbladder volume and improve gallbladder response to neurotransmitters in insulin-resistant obese mice fed a 25% carbohydrate diet. MATERIALS AND METHODS: Twenty eight-week-old insulin-resistant obese (Lep(ob)) mice fed a 25% carbohydrate diet for 4 weeks. Half of the animals had 0.3 g/kg pioglitazone added to their diet. At 12 weeks all animals were fasted and underwent cholecystectomy. Gallbladder volume and weight were measured, and fresh gallbladders were placed in a muscle bath to assess response to acetylcholine (ACh 10(-5)M), neuropeptide Y (NPY 10(-8,-7,-6)M) and cholecystokinin (CCK 10(-10,-9,-8,-7)M). Serum glucose and insulin were measured, and HOMA Index, a measure of insulin resistance, was calculated. RESULTS: Fasting serum insulin and HOMA Index were significantly decreased (P < 0.03), but gallbladder volume was significantly increased (P < 0.03) in the pioglitazone treated group. Pioglitazone did not alter gallbladder weight or response to ACh, NPY, or CCK. CONCLUSION: These data suggest that in insulin-resistant obese mice pioglitazone 1) lowers insulin-resistance, 2) increases resting gallbladder volume, and 3) does not alter gallbladder response to neurotransmitters. Therefore, we conclude that pioglitazone, while improving insulin resistance, paradoxically increases gallbladder volume and, thereby, may increase the propensity for gallstone formation by enhancing gallbladder stasis.

Pioglitazone increases gallbladder volume in insulin-resistant obese mice. Publishing Authors By Initials

HH Al-Azzawi,A Mathur,D Lu,DA Swartz-Basile,A Nakeeb,HA Pitt,

For similar thiazoles: thiazolidinediones research abstracts see: thiazoles: thiazolidinediones research

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Pioglitazone increases gallbladder volume in insulin-resistant obese mice. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: The Journal of surgical research

VOLUME: 136

Page Numbers: 192-7

Journal Abbreviation: J. Surg. Res.

ISSN: 0022-4804

DAY: 11

MONTH: 10

YEAR: 2006

Pioglitazone increases gallbladder volume in insulin-resistant obese mice. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 376340

Pioglitazone increases gallbladder volume in insulin-resistant obese mice. Keywords Mesh Terms:

KEYWORDS: Thiazolidinediones

MESH TERMS: pharmacology

Chemical & Substance for Abstract: Pioglitazone increases gallbladder volume in insulin-resistant obese mice. Information

Substance Name: Cholecystokinin

Registry Number: 9011-97-6

Grant and Affiliation Information for Pioglitazone increases gallbladder volume in insulin-resistant obese mice.

AFFILIATION: Department of Surgery, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA.

Country: United States

AGENCY: United States NIDDK

GRANT: R01 DK-44279

ACRONYM: DK

MEDLINETA: J Surg Res

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