Volume 44, Issue 1 pp. 28-33
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Investigation of the Interaction Mode of Phenothiazine Neuroleptics with α1-Acid Glycoprotein

TOSHIMI MIYOSHI

TOSHIMI MIYOSHI

Faculty of Pharmaceutical Science, Kumamoto University, 5-1 Oe-honmachi, Kumamoto 862, Japan

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KATSUAKI SUKIMOTO

KATSUAKI SUKIMOTO

Faculty of Pharmaceutical Science, Kumamoto University, 5-1 Oe-honmachi, Kumamoto 862, Japan

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MASAKI OTAGIRI

Corresponding Author

MASAKI OTAGIRI

Faculty of Pharmaceutical Science, Kumamoto University, 5-1 Oe-honmachi, Kumamoto 862, Japan

Faculty of Pharmaceutical Science, Kumamoto University, 5-1 Oe-honmachi, Kumamoto 862, Japan.Search for more papers by this author
First published: January 1992
Citations: 23

Abstract

Abstract— The interaction of phenothiazine neuroleptics with α1-acid glycoprotein (AGP) and desialylated AGP (asialoAGP) has been investigated by fluorescence, circular dichroism spectroscopy and by equilibrium dialysis. The binding parameters of phenothiazines obtained from fluorescence agreed closely with those obtained from circular dichroism and equilibrium dialysis. The binding affinities (nK) to AGP were slightly higher than binding affinities to asialoAGP. Attempts to correlate binding affinities with partition coefficients suggested that hydrophobic forces were mainly involved in the binding of phenothiazine neuroleptics to AGP and asialoAGP. However, electrostatic interaction was also found to be involved as suggested by experimental data obtained from the influence of oleic acid and caesium chloride on the drug binding to the two proteins.

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