Stable Colloidal Drug Aggregates Catch and Release Active Enzymes

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• 作者：Christopher K. McLaughlin ; Da Duan ; Ahil N. Ganesh ; Hayarpi Torosyan ; Brian K. Shoichet ; Molly S. Shoichet
• 刊名：ACS Chemical Biology
• 出版年：2016
• 出版时间：April 15, 2016
• 年：2016
• 卷：11
• 期：4
• 页码：992-1000
• 全文大小：511K
• 年卷期：0
• ISSN：1554-8937

文摘

Small molecule aggregates are considered nuisance compounds in drug discovery, but their unusual properties as colloids could be exploited to form stable vehicles to preserve protein activity. We investigated the coaggregation of seven molecules chosen because they had been previously intensely studied as colloidal aggregators, coformulating them with bis-azo dyes. The coformulation reduced colloid sizes to <100 nm and improved uniformity of the particle size distribution. The new colloid formulations are more stable than previous aggregator particles. Specifically, coaggregation of Congo Red with sorafenib, tetraiodophenolphthalein (TIPT), or vemurafenib produced particles that are stable in solutions of high ionic strength and high protein concentrations. Like traditional, single compound colloidal aggregates, the stabilized colloids adsorbed and inhibited enzymes like β-lactamase, malate dehydrogenase, and trypsin. Unlike traditional aggregates, the coformulated colloid-protein particles could be centrifuged and resuspended multiple times, and from resuspended particles, active trypsin could be released up to 72 h after adsorption. Unexpectedly, the stable colloidal formulations can sequester, stabilize, and isolate enzymes by spin-down, resuspension, and release.