Abstract |
The ability to restrict low molecular weight compounds to the gastrointestinal (GI) tract may enable an enhanced therapeutic index for molecular targets known to be associated with systemic toxicity. Using a triazolopyrazine CSF1R inhibitor scaffold, a broad range of prodrugs were synthesized and evaluated for enhanced delivery to the colon in mice. Subsequently, the preferred cyclodextrin prodrug moiety was appended to a number of CSF1R inhibitory active parent molecules, enabling GI-restricted delivery. Evaluation of a cyclodextrin prodrug in a dextran sodium sulfate (DSS)-induced mouse colitis model resulted in enhanced GI tissue levels of active parent. At a dose where no significant depletion of systemic monocytes were detected, the degree of pharmacodynamic effect-measured as reduction in macrophages in the colon-was inferior to that observed with a systemically available positive control. This suggests that a suitable therapeutic index cannot be achieved with CSF1R inhibition by using GI-restricted delivery in mice. However, these efforts provide a comprehensive frame-work in which to pursue additional gut-restricted delivery strategies for future GI targets.
|
Authors | Dawn M George, Raymond J Huntley, Kevin Cusack, David B Duignan, Michael Hoemann, Jacqueline Loud, Regina Mario, Terry Melim, Kelly Mullen, Gagandeep Somal, Lu Wang, Jeremy J Edmunds |
Journal | PloS one
(PLoS One)
Vol. 13
Issue 9
Pg. e0203567
( 2018)
ISSN: 1932-6203 [Electronic] United States |
PMID | 30192846
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
|
Chemical References |
- Csf1r protein, mouse
- Cyclodextrins
- Prodrugs
- Receptors, Granulocyte-Macrophage Colony-Stimulating Factor
- Dextran Sulfate
|
Topics |
- Animals
- Colitis
(chemically induced, drug therapy, immunology)
- Colon
(chemistry)
- Cyclodextrins
(chemistry)
- Dextran Sulfate
(adverse effects)
- Disease Models, Animal
- Drug Evaluation, Preclinical
- Female
- Macrophages
(drug effects, metabolism)
- Mice
- Models, Molecular
- Molecular Structure
- Prodrugs
(administration & dosage, chemical synthesis, chemistry, pharmacokinetics)
- Receptors, Granulocyte-Macrophage Colony-Stimulating Factor
(antagonists & inhibitors)
|