Experimental ALS Drug May Be More Effective Than Existing Ones

Summary: NU-9, an experimental drug, appears to be more effective at treating ALS than existing medications.

Source: Northwestern University

New research on the experimental drug NU-9, invented and developed by two Northwestern University scientists to treat ALS (amyotrophic lateral sclerosis), shows it is more effective than existing FDA-approved drugs for the disease.

More importantly, NU-9 has an enhanced effect when given in combination with those drugs, riluzole and edaravone. The drug was invented by Richard B. Silverman, the Patrick G. Ryan/Aon Professor at Northwestern, and animal studies were carried out by P. Hande Ozdinler, associate professor of neurology at Northwestern University Feinberg School of Medicine.

The research, published recently in Scientific Reportsshowed that NU-9 lengthened the axons of diseased upper motor neurons in an SOD1 ALS mouse model. This new finding about lengthening axons of diseased neurons further illustrates NU-9’s benefits.

The axon is the segment of the upper motor neuron that connects the brain to the spinal cord and makes the corticospinal tract, which degenerates in ALS patients. Deteriorating axons contribute to the swift and fatal paralysis of ALS patients.

“For a drug to be effective, it is important for that drug to improve axon outgrowth and axon health,” said co-lead study author Ozdinler. “This is very important for connecting the brain and the spinal cord and for revitalizing the motor neuron circuitry that degenerates in patients.”

In ALS, movement-initiating nerve cells in the brain (upper motor neurons) and muscle-controlling nerve cells in the spinal cord (lower motor neurons) die.

In research published last year, Northwestern scientists showed NU-9 improved two important factors that cause upper motor neurons to become diseased in ALS: protein misfolding and protein aggregation inside the cell. Both these factors become toxic to the neuron and are common in ALS patients and neurodegeneration overall.

That research showed the NU-9 compound stopped neurons from degenerating so much that the diseased neurons became similar to healthy control neurons after 60 days of treatment in two different mouse models of ALS.

NU-9 moving toward clinical trials

NU-9 is moving toward clinical trials. The company, AKAVA Therapeutics, started last year by Silverman, is carrying out animal safety studies needed for the drug (now called AKV9 in the company) to receive FDA approval to become an Investigational New Drug. Those studies include determining dose level and toxic effects.

This shows neurons
When mixed cortical cultures are established at P3, UMNs are labeled by eGFP expression in UCHL1-eGFP reporter mice, and express disease-causing proteins in reporter lines of mouse models of amyotrophic lateral sclerosis (ALS) (ac) Generation of hSOD1G93A-UeGFP and WT-UeGFP littermate control mice. (de) UMNs in layer 5 of the primary motor cortex express eGFP at postnatal day P3 of WT-UeGFP mice. (e) B8H10 antibody detects misfolded SOD1 protein in the primary motor cortex of hSOD1G93A-UeGFP mice, but not the control WT-UeGFP mice at P3. Scale bars = 200 µm in low mag, 50 µm in high mag panels. Credit: Barış Genç et al

“If everything goes well, we hope to start with healthy volunteers in a Phase 1 clinical trial early in 2023,” said co-lead study author Silverman.

Depending on FDA response to the Phase 1 results, a Phase II trial to administer the drug to ALS patients could begin in early 2024.

“NU-9 has a new mechanism of action, and it needs to be tested in humans for its efficacy in the treatment of ALS,” Silverman said.

“It is a long process—possibly 10 to 12 years—to discover and bring a new drug to the market,” Silverman said. “But this drug has us very excited and hopeful about its possibilities to improve the lives of ALS patients, who have been without hope for so long.”

Other Northwestern authors include Barış Genç, Mukesh Gautam, Benjamin Helmold, Nuran Koçak, Aksu Günay and Gashaw Goshu.

About this ALS and neuropharmacology research news

Author: Marla Paul
Source: Northwestern University
Contact: Press Office – Northwestern University
Image: The image is credited to Barış Genç et al

Original Research: Open access.
NU-9 improves health of hSOD1G93A mouse upper motor neurons in vitro, especially in combination with riluzole or edaravone” by Barış Genç et al. Scientific Reports


Abstract

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NU-9 improves health of hSOD1G93A mouse upper motor neurons in vitro, especially in combination with riluzole or edaravone

Even though amyotrophic lateral sclerosis (ALS) is a disease of the upper and lower motor neurons, to date none of the compounds in clinical trials have been tested for improving the health of diseased upper motor neurons (UMNs).

There is an urgent need to develop preclinical assays that include UMN health as a readout. Since ALS is a complex disease, combinatorial treatment strategies will be required to address the mechanisms perturbed in patients.

Here, we describe a novel in vitro platform that takes advantage of an UMN reporter line in which UMNs are genetically labeled with fluorescence and have misfolded SOD1 toxicity.

We report that NU-9, an analog of the cyclohexane-1,3-dione family of compounds, improves the health of UMNs with misfolded SOD1 toxicity more effectively than riluzole or edaravone, -the only two FDA-approved ALS drugs to date- .

Interestingly, when NU-9 is applied in combination with riluzole or edaravone, there is an additive effect on UMN health, as they extend longer axons and display enhanced branching and arborization, two important characteristics of healthy UMNs in vitro.

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