Drug Discovery for Human African Trypanosomiasis: Identification of Novel Scaffolds by the Newly Developed HTS SYBR Green Assay for Trypanosoma brucei

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Joana Faria (Author) Other; Carolina B Moraes (Author) Other; Rita Song (Author) Other; Bruno S Pascoalino (Author) Other; Nakyung Lee (Author) Other; Jair L Siqueira Neto (Author) Other; Deu John M Cruz (Author) Other; Tanya Parkinson (Author) Other; Jean Robert Ioset (Author) Other; Anabela Cordeiro da Silva (Author) FFUP; Lucio H Freitas Junior (Author) Other

Journal

Title: Journal of Biomolecular Screening

Vol. 20

Pages: 70-81

ISSN: 1087-0571

Publisher: SAGE Publications

Indexing

ISI Web of Knowledge - 15 Citations

Scopus - 20 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-00A-3PR

DOI: 10.1177/1087057114556236

Abstract (EN): Human African trypanosomiasis (HAT) is a vector-transmitted tropical disease caused by the protozoan parasite Trypanosoma brucei. High-throughput screening (HTS) of small-molecule libraries in whole-cell assays is one of the most frequently used approaches in drug discovery for infectious diseases. To aid in drug discovery efforts for HAT, the SYBR Green assay was developed for T. brucei in a 384-well format. This semi-automated assay is cost- and time-effective, robust, and reproducible. The SYBR Green assay was compared to the resazurin assay by screening a library of 4000 putative kinase inhibitors, revealing a superior performance in terms of assay time, sensitivity, simplicity, and reproducibility, and resulting in a higher hit confirmation rate. Although the resazurin assay allows for comparatively improved detection of slow-killing compounds, it also has higher false-positive rates that are likely to arise from the assay experimental conditions. The compounds with the most potent antitrypanosomal activity were selected in both screens and grouped into 13 structural clusters, with 11 new scaffolds as antitrypanosomal agents. Several of the identified compounds had IC50 <1 mu M coupled with high selectivity toward the parasite. The core structures of the scaffolds are shown, providing promising new starting points for drug discovery for HAT.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12