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Selecting an anti-malarial clinical candidate from two potent dihydroisoquinolones

Authors :
Kathleen O’Loughlin
Yizhe Chen
Lei Yang
Fangyi Zhu
Jared T. Hammill
Karen L. White
Gloria Holbrook
David M. Shackleford
Susan A. Charman
Jon C. Mirsalis
R. Kiplin Guy
Burgess B. Freeman
Source :
Malaria Journal, Vol 20, Iss 1, Pp 1-15 (2021), Malaria Journal
Publication Year :
2021
Publisher :
BMC, 2021.

Abstract

Background The ongoing global malaria eradication campaign requires development of potent, safe, and cost-effective drugs lacking cross-resistance with existing chemotherapies. One critical step in drug development is selecting a suitable clinical candidate from late leads. The process used to select the clinical candidate SJ733 from two potent dihydroisoquinolone (DHIQ) late leads, SJ733 and SJ311, based on their physicochemical, pharmacokinetic (PK), and toxicity profiles is described. Methods The compounds were tested to define their physicochemical properties including kinetic and thermodynamic solubility, partition coefficient, permeability, ionization constant, and binding to plasma proteins. Metabolic stability was assessed in both microsomes and hepatocytes derived from mice, rats, dogs, and humans. Cytochrome P450 inhibition was assessed using recombinant human cytochrome enzymes. The pharmacokinetic profiles of single intravenous or oral doses were investigated in mice, rats, and dogs. Results Although both compounds displayed similar physicochemical properties, SJ733 was more permeable but metabolically less stable than SJ311 in vitro. Single dose PK studies of SJ733 in mice, rats, and dogs demonstrated appreciable oral bioavailability (60–100%), whereas SJ311 had lower oral bioavailability (mice 23%, rats 40%) and higher renal clearance (10–30 fold higher than SJ733 in rats and dogs), suggesting less favorable exposure in humans. SJ311 also displayed a narrower range of dose-proportional exposure, with plasma exposure flattening at doses above 200 mg/kg. Conclusion SJ733 was chosen as the candidate based on a more favorable dose proportionality of exposure and stronger expectation of the ability to justify a strong therapeutic index to regulators.

Details

Language :
English
ISSN :
14752875
Volume :
20
Issue :
1
Database :
OpenAIRE
Journal :
Malaria Journal
Accession number :
edsair.doi.dedup.....e9272764eac4761c57cf5d92db22299b