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* Gill Heart Institute, Division of Cardiovascular Medicine
Blood and Marrow Transplant Program, Division of Hematology/Oncology, University of Kentucky, Lexington, KY 40536
1 To whom correspondence should be addressed. e-mail: adaugh{at}uky.edu
Manuscript received 17 May 2001, in revised form 16 January 2002, and in re-revised form 14 February 2002.
Feeding interleukin-4 (IL-4) deficient C57BL/6 LDL receptor (LDLr)-/- mice a modified diet to investigate the role of this cytokine in cholesterol metabolism led to an unexpected phenotype. IL-4-/-
LDLr-/- mice had enlarged gallbladders and an increased mortality that was preceded by acute body weight loss. To determine if IL-4 deficiency accounted for these findings, C57BL/6 IL-4+/+ and IL-4-/- mice were fed either a normal or modified diet. IL-4 deficiency did not alter bile composition or cause liver toxicity in mice fed a fat-enriched diet. Following 8 weeks of feeding a fat-enriched diet, no gallstones were detected in IL-4+/+ mice, and only 20% had cholesterol crystals. In contrast, IL-4-/- mice had a 100% incidence of gallstones and cholesterol crystals. IL-4-/- deficiency also increased serum concentrations of bilirubin following feeding a fat-enriched diet. Therefore, these studies revealed an unexpected finding that IL-4 deficiency predisposes to gallstone formation.King, V. L., S. J. Szilvassy, and A. Daugherty. Interleukin-4 deficiency promotes gallstone formation. J. Lipid Res. 2002. 43: 768771.
Abbreviations: IL-4, interleukin-4; A:G, albumin/total protein; GOT: GPT, glutamic oxalacetic transaminase/glutamic pyruvic transaminase
Supplementary key words bone marrow transplant LDL receptor cholesterol
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