Abstract
A water-soluble polymeric prodrug containing a naproxen moiety was synthesized. The carboxylic groups of naproxen were condensed with the hydroxyl groups of 2-hydroxyethyl methacrylate (HEMA) to produce a drug-linked monomer, denoted HN. The polymeric prodrug was prepared by copolymerization of HN with methacrylic acid. The molar percentage of HN in the polymeric prodrug was 26 mol%, as determined by 1H NMR. To investigate the pertinence of this polymeric prodrug, the hydrolysis was studied in-vitro with or without esterase or lipase. The kinetics of enzymatic catalysis was calculated from a Lineweaver-Burk plot. The anti-inflammatory activity was evaluated using the carrageenan-induced oedema test. The polymeric prodrug released a major fraction of the free naproxen and a significant fraction of the hydroxyethyl ester derived-naproxen. The maximum hydrolysis rate Vmax, and the Michaelis constant Km were calculated to be 2.16 times 10−5 equiv. mol L−1 min−1 and 5.11 times 10−2 equiv. mol L−1. The maximum anti-inflammatory inhibition of free naproxen appeared at 2 h and quickly decreased thereafter. In contrast, the polymeric prodrug showed a maximum at around 2∼3 h and then slowly decreased. This indicates that the polymeric prodrug displays greater potency than free naproxen in the inhibition of acute inflammatory processes over long periods.
摘要:合成了一种含有萘普生基团的水溶性高分子前药。萘普生的羧基与2-羟基乙基甲基丙烯酸酯(HEMA)的羟基缩合,生成了一种药物连接单体,称为HN。通过与甲基丙烯酸的共聚合制备了高分子前药。通过1H NMR测定,高分子前药中HN的摩尔百分比为26%。为了研究这种高分子前药的相关性,在有或无酯酶或脂肪酶的情况下进行了体外水解研究。从Lineweaver-Burk图中计算出酶催化动力学。使用海藻酸诱导水肿试验评估了抗炎活性。高分子前药释放了大部分游离萘普生和相当比例的羟乙基酯基萘普生。最大水解速率Vmax和米氏常数Km分别为2.16×10-5当量mol L-1 min-1和5.11×10-2当量mol L-1。自由萘普生的最大抗炎抑制作用出现在2小时左右,然后迅速下降。相反,高分子前药在2-3小时左右显示出最大抗炎作用,然后缓慢下降。这表明,相比于自由萘普生,高分子前药在长期抑制急性炎症过程方面具有更强的效力。