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NX210c – An innovative peptide targeting a broad range of neurodegenerative diseases

NX210c is a short, synthetic peptide inspired by SCO-spondin, a multifunctional glycoprotein essential in neurogenesis. It targets blood-brain barrier restoration, supports neuronal protection, and enhances intercellular communication. Its mechanism of action may have therapeutic relevance across multiple CNS disorders.

The discovery

Origin of NX210c

The scientific journey began decades ago with research on neurogenesis during embryonic development at the University of Clermont-Ferrand (France), focusing on SCO-spondin, a multifunctional glycoprotein secreted by the subcommissural organ.

The Subcommissural Organ (SCO)

The human subcommissural organ (SCO), an ependymal derivative of the diencephalic roof, shows its highest development between the 3rd and 4th months of fetal life, followed by a gradual regression during the second half of pregnancy and a further decline after birth. Thus, in 6-year-old children, only rudiments of SCO parenchyma can be found.

SCO-spondin

SCO-spondin: a multifunctional glycoprotein produced by the subcommissural organ is essential for neurogenesis during embryogenesis.

Intellectual Property

NX210c is protected by 7 fully owned patent families including a composition of matter already granted in EU/USA/JP.
NX210c has also been granted “Orphan Drug Designation” (ODD) by the FDA and the EMA for ALS indication.

MECHANISM & PROPERTIES

A multi-target mechanism of action

NX210c is a 12 amino-acid peptide, Thrombospondin Repeat analog, derived from a highly conserved amino acid domain of SCO-spondin. This drug candidate represents a potentially breakthrough therapeutic for CNS diseases. Its mechanisms of action target multiple levels:

Restore the blood-brain barrier

Restores the blood-brain barrier to prevent toxic infiltration into the brain

Neuroprotection

Protects neurons against glutamate excitotoxicity and promotes cellular survival

Enhance Neurotransmission

Improves synaptic communication between neurons

Indications

The BBB: a key player in CNS disease progression

Axoltis is developing NX210c, a short amino acid peptide with unique properties that directly targets the restoration of the blood-brain barrier (BBB), a key player in the onset and progression of numerous central nervous system (CNS) diseases.

Scientific Consensus

There is now consensus in the scientific community regarding the causal link between BBB disruption and the development of CNS disorders – including neurodegenerative diseases, stroke, and traumatic brain injury.

A New Therapeutic Strategy

While past research often focused on increasing BBB permeability to allow therapeutic agents to pass through, recent literature highlights the critical importance of preserving BBB integrity.

Tight Junction Proteins

Specifically, reduced expression of tight junction proteins such as claudin-5 has been strongly correlated with increased BBB permeability and the onset of diseases like Alzheimer’s, Parkinson’s, Amyotrophic Lateral Sclerosis, Huntington’s disease, multiple sclerosis, and schizophrenia—both in patients and in animal models. Considering this, repairing and protecting the BBB has emerged as a promising new therapeutic strategy.

Study overview

SEALS — Phase 2 Clinical Trial in ALS

The SEALS study is a Phase 2, multicenter, randomized, double-blind, placebo-controlled clinical trial evaluating NX210c in adult patients with amyotrophic lateral sclerosis (ALS). Coordinated by Dr. Bernard at the ALS Reference Center of Hospices Civils de Lyon, the study assesses the efficacy, safety, tolerability, and pharmacokinetics of repeated intravenous administrations of NX210c. Patients are stratified based on baseline serum Neurofilament Light (NfL) levels to support robust clinical evaluation. The study is registered on ClinicalTrials.gov (NCT06365216). Recruitment for this clinical trial is now closed. No additional patients can be enrolled.

To learn more about reusing clinical trial data, click here.

Phase
Phase 2 clinical trial
Design
Multicenter, randomized, double-blind, placebo-controlled
Population
82 adult ALS patients
Stratification
Baseline serum Neurofilament Light (NfL) levels
Treatment
Intravenous NX210c, 3× weekly for 4 weeks
Dose levels
5 mg/kg and 10 mg/kg
Administration
~10-minute infusion
Follow-up
Up to 3 months post-treatment
Objectives
Efficacy, safety, tolerability, pharmacokinetics
Sites
16 clinical centers in France
Topline results
Expected Q2 2026

PIPELINE OVERVIEW

Therapeutic potential across CNS disorders

NX210c’s mechanism of action extends its therapeutic potential beyond ALS, our first indication. By restoring blood-brain barrier integrity, protecting neurons and enhancing the neurotransmission, NX210c may have relevance across a broad spectrum of CNS disorders.

NX210c
Preclinical
Phase I
Phase II
Phase III or compassionate use

Healthy Volunteers

Elderly population

Discover
Multiple Ascending Doses
Executed

Amyotrophic Lateral Sclerosis

Orphan Drug Designation | EMA & FDA GRANTED

Discover
PHASE 2 – "SEALS"
Recruitement is closed Results Q2'26

Multiple Sclerosis

RRMS: Relapsing-Remitting Multiple Sclerosis

Discover
In Silico QSP* Simulation
executed

Other indications

AD, PD, SCI among diseases with BBB dysfunction

Discover
In vitro / in vivo 
or in silico PoC
Open to Strategic Partnership
AD = Alzheimer’s Disease ; PD = Parkinson’s Disease ; SCI = Spinal Cord Injury
*Quantitative System Pharmacology