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Novel Block Copolymer, Micelle Preparation, And Anticancer Agent Containing The Same As Active Ingredient

a technology of micelle and anticancer agent, which is applied in the direction of biocide, drug composition, animal husbandry, etc., can solve the problems of reduced stability of pharmaceutical preparation and difficult administration, and achieve the effects of less toxicity, increased water solubility of drug, and more potent drug activity

Inactive Publication Date: 2008-05-15
NIPPON KAYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]The novel block copolymer of the present invention can be a drug carrier of less toxicity without showing harmful side effects such as hypersensitive reaction. The block copolymer can form micelles in an aqueous medium and incorporate a sparingly water-soluble anticancer agent, especially paclitaxel, into the micelles in an amount necessary for disease treatment without bonding it to the block copolymer, thereby increasing the water solubility of the drug. When an aqueous solution of the micelle preparation of the present invention having the drug incorporated into it with the block copolymer is left at room temperature, the micelle preparation containing the sparingly water-soluble anticancer agent is stable in an aqueous medium without observing aggregation of the micelles or release of the drug from the micelles for at least several hours. The micelle preparation can be clinically useful anticancer agent because it maintains a higher concentration in blood and exhibit more potent drug activity with reduced side effects than by administering the anticancer agent alone or by administering the anticancer agent solubilized with a conventional surfactant.

Problems solved by technology

In the above-described method of solubilization with a surfactant, there is a problem that harmful side effects such as hypersensitive reaction attributable to the surfactant are observed in some cases and the stability of a pharmaceutical preparation is reduced so that when a drug-containing solution is stored or left, the drug is precipitated to make its administration difficult.

Method used

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  • Novel Block Copolymer, Micelle Preparation, And Anticancer Agent Containing The Same As Active Ingredient
  • Novel Block Copolymer, Micelle Preparation, And Anticancer Agent Containing The Same As Active Ingredient
  • Novel Block Copolymer, Micelle Preparation, And Anticancer Agent Containing The Same As Active Ingredient

Examples

Experimental program
Comparison scheme
Effect test

example 1

Production of Block Copolymer 2

[0080]DMF (630 mL) was added to 42.00 g of PEG (average molecular weight 12000)-pAsp (polyaspartic acid; average polymerization degree 40)-Ac (represented by the general formula (2) wherein R1 is a methyl group, R2 is a trimethylene group, R3 is a methylene group, R4 is an acetyl group, n is about 272, x is about 10, y is about 30; abbreviated hereinafter as PEG-pAsp-Ac) produced by a method described in JP-A-6-206815 (Patent Document 2) supra, and PEG-pAsp-Ac was dissolved at 25° C., and DMAP (9.90 g), 4-phenyl-1-butanol (10.93 mL) and DIPCI (15.86 mL) were added thereto and reacted at the same temperature for 24 hours. 1.58 L of ethyl acetate and then 4.73 L of hexane were added to the reaction liquid, and precipitates were collected by filtration and dried under reduced pressure to give 49.56 g crude crystals. The crude crystals were dissolved in acetonitrile containing 50% water (hereinafter referred to as “50% hydrous acetonitrile”), then passed t...

example 2

Production of Block Copolymer 5

[0103]PEG-pAsp-Ac (3.0 g) produced by a method described in JP-A-6-206815 (Patent Document 2) was dissolved in DMF (120 mL), and benzyl bromide (0.60 mL) and 1,8-diazabicyclo[5.4.0]undec-7-ene (0.75 mL) were added thereto and reacted at 35° C. for 17 hours. This reaction liquid was added dropwise to a mixed solvent (1.2 L) consisting of diisopropyl ether:ethanol (4:1), and precipitates were recovered by filtration and dried under reduced pressure to give 3.17 g of crude crystals. The crude crystals were dissolved in 30% aqueous acetonitrile solution and then passed through cation-exchange resin Dowex 50w8 (40 mL) and washed with the 30% aqueous acetonitrile. The eluent was concentrated under reduced pressure and lyophilized to give 2.99 g of block copolymer 4.

[0104]The block copolymer 4 (19.5 mg) was hydrolyzed by the same method as in Example 1 and measured by reverse phase HPLC, indicating that benzyl alcohol bound via an ester linkage was 32% relati...

example 3

Production of Block Copolymer 7

[0111]DMF (30 mL) was added to PEG-pAsp-Ac (2.0 g) produced by a method described in JP-A-6-206815 (Patent Document 2), to dissolve it at 25° C., and DMAP (0.472 g), benzyl alcohol (499 μL) and DIPCI (755 μL) were added thereto and reacted at the same temperature for 21 hours. 75 mL of ethyl acetate and then 225 mL of hexane were added to the reaction liquid, and precipitates were collected by filtration and dried under reduced pressure to give 2.28 g of crude crystals. The crude crystals were dissolved in 50% hydrous acetonitrile, then passed through cation-exchange resin Dowex 50w8 (30 mL) and washed with 50% hydrous acetonitrile. The eluent was concentrated under reduced pressure and lyophilized to give 2.10 g of block copolymer 6.

[0112]The block copolymer 6 (35.5 mg) was hydrolyzed by the same method as in Example 1 and measured by reverse phase HPLC, indicating that benzyl alcohol bound via an ester linkage was 60% relative to m.

[0113]When the blo...

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Abstract

A medicinal preparation is desired which has no harmful side effects such as hypersensitive reaction, heightens the water solubility of a sparingly water-soluble anticancer agent, maintains a high drug concentration in the blood, accumulates a drug in a tumor tissue at a high concentration, heightens the pharmacological effect of the sparingly water-soluble anticancer agent, and diminishes the side effects of the anticancer agent. Provided are: a novel block copolymer which can be a drug carrier having no harmful side effects such as hypersensitive reaction; a micelle preparation in which micelles are formed and which contains a sparingly water-soluble anticancer agent, especially paclitaxel, incorporated in the micelles in an amount necessary for a disease treatment without bonding it to the block copolymer and which can heighten the solubility of the drug in water; and an anticancer agent which comprises the micelle preparation as a medical ingredient, maintains a high concentration in the blood, has more potent drug activity, and is reduced in toxicity.

Description

TECHNICAL FIELD[0001]The present invention relates to a novel block copolymer, a micelle preparation using the same, and an anticancer agent containing the micelle preparation as an active ingredient.BACKGROUND ART[0002]Many of drugs, particularly anticancer agents, are sparingly water-soluble hydrophobic compounds. When such drug is used to attain a desired therapeutic effect, the drug is usually solubilized and administered to a patient. Accordingly, solubilization of sparingly water-soluble drugs, particularly sparingly water-soluble anticancer agents, is important for oral or parenteral pharmaceutical preparations, particularly those for intravenous administration.[0003]As one method of solubilizing a sparingly water-soluble anticancer agent, there is a method which comprises adding a surfactant, and it is known to use, for example, a polyoxyethylene castor oil derivative (Cremophor) in order to solubilize paclitaxel. As an another method, a method of using a micelle-forming blo...

Claims

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Application Information

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IPC IPC(8): A61K31/337A61K9/14
CPCA61K9/1075A61K47/34A61K31/337A61P35/00A61K9/107C08G61/12C08G73/00C08G73/10C08G81/00
Inventor SHIMIZU, KAZUHISAISHIKAWA, KEIZOUNAKANISHI, TAKESHI
Owner NIPPON KAYAKU CO LTD
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