Legumain, a kind of asparaginyl endopeptidase, is overexpressed in highly metastatic and highly aggressive tumor, which can undergo an enzymatic hydrolysis of substrates. We proposed a legumain-responsive functional gold nanoparticle (GNP) drug delivery system (GNPs-A & C), which was consist of Ala-Ala-Asn-Cys-Lys (AK) modified GNPs (GNPs-AK) and 2-cyano-6-aminobenzothiazole (CABT) modified GNPs (GNPs-CABT). In the circulation system, the GNPs-A & C could passively target to the tumor site through the enhanced permeability and retention (EPR) effect. Then the overexpressed legumain specifically cleave the peptide to exposure the 1, 2-thiolamino group, which could take place click reaction with the cyano group of CABT, leading to the aggregation of two GNPs, these aggregates of GNPs with increased size were more likely to retain within tumor site. In vivo fluorescent imaging demonstrated GNPs-A & C could acquire an enhanced accumulation in legumain-overexpressed C6 tumor. Importantly, after tethering DOX, the GNPs-DOX-A & C showed an excellent anti-tumor effect with reduced cardiotoxicity.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |