Characterization of lipophilic drug binding to rat intestinal fatty acid binding protein

Tony Velkov, Maria Lourdes Regina Hughes, Henry James Horne, Jamie Scott Simpson, Christopher John Porter, Martin Scanlon

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19 Citations (Scopus)


Intestinal fatty acid binding protein (I-FABP) is present at high levels in the absorptive cells of the intestine (enterocytes) where it plays a role in the intracellular solubilization of fatty acids (FA). However, I-FABP has also been shown to bind to a range of non-FA ligands, including some lipophilic drug molecules, albeit with generally lower affinity than FA. The significance of these lower affinity interactions with exogenous compounds is not known. In this manuscript, we describe further characterization of drug-rat I-FABP binding interactions using a thermal-shift assay. A structural explanation of the observed affinity of rat I-FABP for different drugs based on spectroscopic data and modeling experiments is presented. In addition, immunocytochemistry has been used to probe the expression of I-FABP in a cell culture model reflective of the absorptive cells of the small intestine. Taken together, these data suggest a possible role for I-FABP in the disposition of some lipophilic drugs within the enterocyte.
Original languageEnglish
Pages (from-to)87 - 95
Number of pages9
JournalMolecular and Cellular Biochemistry
Issue number1-2
Publication statusPublished - 2009

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