Denali Therapeutics Announces DNL343 Interim Phase 1b Data in ALS and Entry into the HEALEY ALS Platform Trial

  • DNL343 demonstrated extensive blood-brain barrier penetration and robustly inhibited the integrated stress response pathway implicated in ALS
  • Once-daily oral dosing with DNL343 for 28 days was generally well tolerated in participants with ALS
  • The design phase for entry of DNL343 into a Phase 2/3 trial in the HEALEY ALS Platform Trial is underway

SOUTH SAN FRANCISCO, CA, USA I December 05, 2022 I Denali Therapeutics Inc. (NASDAQ: DNLI), a biopharmaceutical company developing a broad portfolio of product candidates engineered to cross the blood-brain barrier (BBB) for neurodegenerative diseases and lysosomal storage disorders, today announced interim results from a Phase 1b study of its eIF2B agonist, DNL343, in participants with amyotrophic lateral sclerosis (ALS). Once-daily oral dosing with DNL343 for 28 days was generally well tolerated and demonstrated extensive BBB penetration as well as robust inhibition of biomarkers associated with the integrated stress response (ISR) in blood samples from study participants. By inhibiting the ISR pathway, DNL343 is intended to prevent or slow disease progression associated with stress granule formation and TDP-43 aggregation, a hallmark pathology present in nearly all individuals with ALS. The Phase 1b results will be presented at the 33rd International Symposium on ALS/MND, which is being held virtually December 6-9, 2022. A copy of the poster presentation is available on Denali’s website on the Investor & Media Relations section under the Events page. Denali also announced initiation of the design phase of a Phase 2/3 study for entry into the HEALEY ALS Platform Trial led by the Sean M. Healey & AMG Center for ALS at Massachusetts General Hospital (MGH) in collaboration with the Northeast ALS Consortium.

“These initial Phase 1b results with DNL343 in ALS are consistent with our previously reported Phase 1 healthy volunteer data and are an important milestone for the program,” said Carole Ho, M.D., Chief Medical Officer at Denali. “The data continue to support late-stage development plans for DNL343, and we are excited to be collaborating with the HEALEY ALS Platform Trial team in our unified effort to advance potential treatment options for people living with ALS.”

“ALS is a devastating progressive disorder with very few treatment options,” said Merit Cudkowicz, M.D., M.Sc., principal investigator and sponsor of the HEALEY ALS Platform Trial, director of the Sean M. Healey & AMG Center for ALS, chief of the Department of Neurology at MGH, and the Julieanne Dorn Professor of Neurology at Harvard Medical School. “Given the strong collective data from the DNL343 program to date, we are looking forward to working with Denali to develop DNL343 for the HEALEY ALS Platform Trial, bringing us closer to our goal of finding more effective treatments for ALS through collaboration.”

About the Phase 1b study in ALS
As previously announced, the Phase 1b study is a multicenter, randomized, placebo-controlled, double-blind, 28-day study followed by an 18-month open-label extension, designed to evaluate the safety, pharmacokinetics, and pharmacodynamics of DNL343 in participants with ALS. Enrollment in the study is complete with 29 participants. An interim analysis was performed after 20 participants randomized to receive DNL343 or placebo had completed the double-blind period of the study. The open-label extension is ongoing. Further information on the study can be accessed at

In the interim analysis, DNL343 demonstrated dose-dependent increases in plasma concentrations and a long plasma half-life, supporting once-daily dosing. The mean ratio of drug in cerebrospinal fluid compared to unbound drug in plasma ranged from 1.02–1.23, suggesting that DNL343 effectively crosses the blood-brain barrier and is extensively distributed to the central nervous system. Robust inhibition of ISR was noted, as measured by attenuation of the ISR pathway biomarkers (ATF4 and CHAC1) in blood samples. DNL343 was generally well tolerated in participants with ALS in this study.

The HEALEY ALS Platform Trial is a large-scale collaborative effort made possible by contributions from patients and families, clinical trial sites, industry partners and research collaborators to evaluate multiple investigational therapies simultaneously with the goal of accelerating the development of potential new treatments for ALS. Therapeutic candidates that enter the platform trial are chosen by a group of expert ALS scientists and members of the Healey & AMG Center.

About the eIF2B activator DNL343
Modulation of eIF2B activity with DNL343 is a novel and targeted investigational approach with first-in-class potential for the treatment of ALS. eIF2B is an intracellular protein complex that regulates protein synthesis and is required for neuronal health and function. When neurons experience stress, activation of the ISR pathway leads to suppression of eIF2B activity, resulting in impaired protein synthesis and formation of stress granules. Stress granules are thought to be a precursor of TDP-43 aggregation, which is a hallmark pathology in ALS. DNL343 is designed to activate eIF2B and thereby restore protein synthesis, disperse TDP-43 aggregates, and improve neuronal survival. DNL343 is an investigational therapeutic and has not been approved by any regulatory authority for any commercial use.

About Denali Therapeutics
Denali Therapeutics is a biopharmaceutical company developing a broad portfolio of product candidates engineered to cross the BBB for neurodegenerative diseases and lysosomal storage disorders. Denali pursues new treatments by rigorously assessing genetically validated targets, engineering delivery across the BBB and guiding development through biomarkers that demonstrate target and pathway engagement. Denali is based in South San Francisco. For additional information, please visit

SOURCE: Denali Therapeutics

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