Enhancing Effect of β-Lactoglobulin on the Rate of Cyclosporin Absorption
Keywords:
cyclosporine, Caco-2, permeability, absorption enhancementAbstract
The aim of this study was to determine the effects of β-lactoglobulin (β-LG) on the intestinal absorption of cyclosporin A (CsA) in vivo and in vitro. After intraduodenal co-administration of CsA (5 mg/kg) with 150 mg/kg β-LG, Tmax was significantly lower than that of control rats which were given the same dose of CsA without β-LG. Cmax and AUC were significantly increased as compared with the control while T1/2 were not significant. Moreover, a deconvolution method revealed that the rate of CsA absorption was enhanced by β-LG (150 mg/kg) by about 12 times. These results indicate that β-LG significantly enhanced the rate of CsA absorption and the extent of CsA bioavailability in the gut. β-LG did not change the solubility of CsA in vitro, but β-LG increased the apical-to-basolateral permeability clearance of CsA (PScell), with pronounced increase in the permeability of unbound CsA (PSu,cell), across the Caco-2 monolayers in a concentration-dependent manner in vitro. It was thus considered that β-LG-mediated transport of CsA might be a possible mechanism to enhance the intestinal absorption of CsA in vivo.
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