1991年10月
HEPATIC DISPOSITION CHARACTERISTICS OF IN-111 LABELED LACTOSAMINATED BOVINE SERUM-ALBUMIN IN RATS
PHARMACEUTICAL RESEARCH
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- 巻
- 8
- 号
- 10
- 開始ページ
- 1253
- 終了ページ
- 1257
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1023/A:1015895511208
- 出版者・発行元
- PLENUM PUBL CORP
The hepatic disposition of lactosaminated bovine serum albumin (Lac-BSA) in rats was studied at the whole body, isolated liver, and isolated parenchymal cell levels. After intravenous injection, In-111-Lac-BSA (1mg/kg) was rapidly eliminated from the plasma due to extensive uptake by liver parenchymal cells; however, a significant decrease in hepatic clearance was observed at high dose (50 mg/kg). In a single-pass, constant infusion experiment in the isolated liver, In-111-Lac-BSA was continuously extracted. The extraction ratio at steady state (E(ss)) for In-111-Lac-BSA was significantly decreased by coadministrating galactose, NH4Cl, or chloroquine, and at low temperature, suggesting that hepatic uptake of Lac-BSA proceeds via receptor-mediated endocytosis for asialoglycoprotein. Kinetic analysis of In-111-Lac-BSA binding with isolated parenchymal cells at 4-degrees-C yielded a dissociation constant (K(d)) of 2.5 x 10(-8) M and a value of 3.5 x 10(5) maximal binding sites/cell (B(max)). The internalization rate constant (k(int)) for In-111-Lac-BSA was calculated to be 0.46 min-1 in liver perfusion experiments using the EDTA-wash method.
- リンク情報
- ID情報
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- DOI : 10.1023/A:1015895511208
- ISSN : 0724-8741
- PubMed ID : 1796043
- Web of Science ID : WOS:A1991GJ51900007