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Table 2 Most active compounds tested by St Jude’s Children’s Research Hospital

From: Repositioning: the fast track to new anti-malarial medicines?

Compound

Class (therapeutic area)

EC503D7 (μM)

EC50K1 (μM)

Methylene blue

Nitric oxide/guanylate cyclase inhibitor (various)

<0.0003 (NA)

<0.0003 (NA)

Dactinomycin

Nucleoside reverse transcriptase inhibitor (oncology)

0.0009 (0, 0.13)

0.001 (0.0003, 0.006)

Sulfamerazine

Dihydrofolate synthetase inhibitor (anti-infective)

0.01 (0.01, 0.01)

0.01 (0.01, 0.01)

Methotrexate

Dihydrofolate reductase inhibitor (oncology)

0.01 (0.009, 0.01)

0.02 (0.01, 0.02)

Bortezomib

Proteasome inhibitor (oncology)

0.02 (0.01, 0.04)

0.08 (0.07, 0.09)

Thiothixene

Post-synaptic receptor agonista (anti-psychotic)

0.04 (0, 233.71)

0.02 (0.01, 0.05)

Dequalinium

Anti-septic

0.06 (0.002, 1.53)

0.06 (0.03, 0.12)

Doxorubicin

Topoisomerase II inhibitor, DNA intercalating agent (oncology)

0.21 (0.16, 0.27)

0.20 (0.14, 0.30)

Pentamidine

Inhibition of DNA, RNA, phospholipid and protein synthesisb (anti-infective)

0.22 (0.18, 0.27)

0.05 (0.04, 0.06)

Bosutinib

Tyrosine kinase inhibitor (oncology)

0.22 (0.016, 3.11)

0.65 (0.36, 1.19)

Aminopterin

Dihydrofolate reductase inhibitor (oncology)

0.32 (0.30, 0.33)

1.25 (1.11, 1.41)

Midostaurin

Multi-kinase inhibitor (oncology)

0.35 (0.17, 0.71)

0.15 (0.13, 0.17)

Lestaurtinib

FMS-like tyrosine kinase 3 inhibitor (oncology)

0.49 (0.28, 0.84)

0.34 (0.29, 0.41)

Demecarium

Cholinesterase inhibitor (ophthalmology)

0.51 (0.45, 0.57)

0.30 (0.26, 0.36)

Cyproterone

Steroidal anti-androgen (oncology)

0.56 (0.54, 0.58)

0.89 (0, 1501.50)

Lapatinib

Tyrosine kinase inhibitor (oncology)

0.56 (0.39, 0.80)

>7.37 (NA)

Pimozide

Dopamine receptor blocker (anti-psychotic)

0.70 (0.44, 1.11)

>12.76 (NA)

Pravastatin

HMG-CoA reductase inhibitor (anti-cholesterol)

0.75 (0.51, 1.09)

0.12 (0.10, 0.15)

Dipyrone

NSAIDb (pain)

0.84 (0.71, 0.98)

0.50 (0.21, 1.16)

Mitomycin

Inhibition of DNA synthesis (oncology)

0.97 (0.81, 1.17)

0.51 (0.45, 0.57)

Propafenone

Sodium channel modulator (cardiology)

1.22 (0.58, 2.55)

0.33 (0.31, 0.34)

Cyclosporin A

Immune suppressant (oncology)

1.23 (1.06, 1.44)

0.87 (0.62, 1.23)

Vorinostat

Histone deacetylase inhibitor (oncology)

1.47 (1.17, 1.84)

0.84 (0.76, 0.93)

Sorafenib

Multi-kinase inhibitor (oncology)

2.71 (2.4, 3.1)

0.88 (0.7, 1.1)

  1. NA, not available. EC50 values are shown as mean (95% CI). Compounds with an EC50 < 1 μM against either P. falciparum strain are shown. Relevant results from all compound sets tested at SJCRH are shown. Where compounds were duplicated across the consolidated test set, the results with the most potent in vitro activity are shown. Known anti-malarial drugs have been excluded.
  2. aAgonist of dopaminergic-receptors, serotonergic-receptors, histaminergic-receptors, alpha1/alpha2-receptors, and muscarinic (cholinergic) M1/M2-receptors.
  3. bMechanism unknown.
  4. SYBR®I fluorescence assay for activity against P. falciparum strains 3D7 and K1.