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P‐glycoprotein‐mediated transcellular transport of MDR‐reversing agents
Author(s) -
Saeki Tohru,
Ueda Kazumitsu,
Tanigawara Yusuke,
Hori Ryohei,
Komano Tohru
Publication year - 1993
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(93)81540-g
Subject(s) - p glycoprotein , paracellular transport , transcellular , pharmacology , multiple drug resistance , chemistry , staurosporine , atp binding cassette transporter , microbiology and biotechnology , biochemistry , biology , transporter , kinase , membrane , protein kinase c , permeability (electromagnetism) , antibiotics , gene
Understanding of the interactions between P‐glycoprotein and multidrug resistance (MDR) reversing agents is important in designing more effective MDR modulators. We examined transcellular transport of several MDR modulators by using a drug‐sensitive epithelial cell line, LLC‐PK 1 and its transformant cell line, LLC‐GA5‐COL300, which expresses human P‐glycoprotein on the apical surface. Basal‐to‐apical transports of azidopine and diltiazem across the LLC‐GA5‐COL300 monolayer were increased and apical‐to‐basal transports were decreased compared to those across the LLC‐PK 1 monolayer, indicating that P‐glycoprotein transports azidopine and diltiazem. Movements of nitrendipine and staurosporine across the epithelial monolayer were not affected by P‐glycoprotein. These results suggests that some MDR modulators exert their inhibitory effect not only by blocking the initial binding of anticancer drugs but throughout the course of the transport process.