Discovery of Potent, Selective, and Brain-Penetrant Apoptosis Signal-Regulating Kinase 1 (ASK1) Inhibitors that...

Area of Science:

• Neuroscience
• Pharmacology
• Molecular Biology

Background:

• Apoptosis signal-regulating kinase 1 (ASK1) is a key mediator in cellular stress responses, inflammation, and apoptosis.
• Modulating the ASK1 pathway holds therapeutic potential for neurological diseases.

Purpose of the Study:

• To optimize a previously identified ASK1 inhibitor (compound 3) for preclinical neurological disease models.
• To evaluate the efficacy of a novel, optimized ASK1 inhibitor (compound 32) in the central nervous system (CNS).

Main Methods:

• Discovery and characterization of compound 32, a potent and selective ASK1 inhibitor.
• Assessment of pharmacokinetic properties and brain penetration of compound 32.
• Evaluation of compound 32 in a human tau transgenic (Tg4510) mouse model with elevated brain inflammation.

Main Results:

• Compound 32 demonstrated potent ASK1 inhibition (cell IC50 = 25 nM) with suitable brain penetration.
• Treatment of Tg4510 mice with compound 32 (3-30 mg/kg, BID/PO for 4 days) significantly reduced cortical inflammatory markers, including IL-1β.
• These findings confirm the ability of compound 32 to inhibit ASK1 within the CNS.

Conclusions:

• Compound 32 is a promising ASK1 inhibitor with demonstrated CNS activity.
• This inhibitor shows potential for treating neurological conditions characterized by inflammation and ASK1 pathway activation.