Receptor-Mediated Uptake of Human .ALPHA.1-Acid Glycoprotein into Liver Parenchymal Cells in Mice

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  • MATSUMOTO Kazuaki
    Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University
  • NISHI Koji
    Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University Department of Clinical Pharmacy, Yokohama College of Pharmacy
  • KIKUCHI Mari
    Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University
  • WATANABE Hiroshi
    Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University Center for Clinical Pharmaceutical Sciences, Kumamoto University
  • NAKAJOU Keisuke
    Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University
  • KOMORI Hisakazu
    Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University
  • KADOWAKI Daisuke
    Center for Clinical Pharmaceutical Sciences, Kumamoto University
  • SUENAGA Ayaka
    Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University
  • MARUYAMA Toru
    Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University Center for Clinical Pharmaceutical Sciences, Kumamoto University
  • OTAGIRI Masaki
    Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University Faculty of Pharmaceutical Sciences, Sojo University

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  • Receptor-Mediated Uptake of Human α1-Acid Glycoprotein into Liver Parenchymal Cells in Mice

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  Human α1-acid glycoprotein (AGP), a serum glycoprotein, is thought to have anti-inflammatory effects by a mechanism that is not well understood. In this study, we investigated the pharmacokinetics of AGP in mice using enzymatically modified AGP (AGP with the sialic acids removed, asialo-AGP, and with both sialic acids and galactose removed, agalacto-AGP). It was observed that AGP was eliminated from the circulation slowly, and was mainly taken up by the liver. The elimination of labeled AGP, asialo-AGP and agalacto-AGP from the circulation was suppressed in the presence of excess unlabeled AGP, asialo-AGP and agalacto-AGP, respectively, suggesting the receptor-mediated uptake of these AGPs. Interestingly, the uptake of AGP by the liver competed with agalacto-AGP, but not with asialo-AGP, while agalacto-AGP competed with asialo-AGP. These results suggest that agalacto-AGP binds to at least two types of receptors, namely asialoglycoprotein receptor (ASGPR) and an as yet unidentified receptor that is shared with AGP, and that AGP is directly taken up by the liver through such a receptor and not via ASGPR. These findings help improve our understanding of the clearance mechanism of AGP.<br>

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