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  • Title: Immunolocalization of farnesoid X receptor (FXR) in mouse tissues using tissue microarray.
    Author: Higashiyama H, Kinoshita M, Asano S.
    Journal: Acta Histochem; 2008; 110(1):86-93. PubMed ID: 17963822.
    Abstract:
    Farnesoid X receptor (FXR) is a member of the nuclear receptor family and is known to play important roles in bile acid homeostasis, and lipid and glucose metabolism. In this study, to elucidate the systemic physiological functions of FXR, comprehensive immunohistochemical analysis of cell/subcellular localization of FXR and its heterodimer partner, retinoid X receptor (RXR)-alpha, in adult mice tissues was performed using tissue microarray (TMA)-based immunohistochemistry. FXR immunolabeling was observed in the enterohepatic system--including absorptive epithelium in the intestines, hepatocytes and gall bladder epithelium, several epithelial lineage cells including the basal cells of stratified epithelium in the tongue, esophagus, forestomach--skin, corneal epithelium and ciliary body epithelium in the eye and adrenocortical cells--including glandular cells in the zona reticularis/fasciculata. In these FXP-positive cells, FXR was preferentially localized to the nucleus. RXR-alpha was ubiquitously distributed in the nucleus of most cell types, including FXR-positive cell types in the examined tissues. These data suggest that FXR might have various physiological roles, not only in bile acid homeostasis, and lipid and glucose metabolism, but also in the epithelial cell barrier, visual and urinary function through multiple organ systems.
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