Davunetide
Low EvidenceAn eight-amino-acid ADNP-derived peptide studied for microtubule stabilization, tau-related neuroprotection, and rare ADNP syndrome.
What It Is
Davunetide (NAP; sequence Asn-Ala-Pro-Val-Ser-Ile-Pro-Gln, NAPVSIPQ) is an eight-amino-acid fragment of activity-dependent neuroprotective protein (ADNP), a glial protein released in response to vasoactive intestinal peptide (VIP). It belongs to a mechanistically distinct class of neuroprotective peptides that act on the cellular cytoskeleton rather than on neurotransmitter receptors. In preclinical models, davunetide stabilizes microtubules — partly through interaction with the microtubule end-binding proteins EB1 and EB3 — and reduces hyperphosphorylation of the tau protein, the same protein that forms tangles in Alzheimer's disease and other tauopathies. A 2023 study reported that davunetide penetrates the cell nucleus, helping explain its pleiotropic effects on gene expression and cytoskeletal repair. The compound has a long and instructive clinical history: developed originally by Allon Therapeutics as an intranasal spray (AL-108), it advanced to a large randomized, double-blind, placebo-controlled phase 2/3 trial in progressive supranuclear palsy (PSP), a pure tauopathy. That pivotal 313-patient trial, published in Lancet Neurology in 2014, was negative — davunetide did not slow disease progression on either primary endpoint. Earlier exploratory studies had reported memory signals in amnestic mild cognitive impairment and functional improvements in schizophrenia, but none established efficacy. In 2026, davunetide is regaining research attention through a focused second act: it was licensed from Tel Aviv University (the laboratory of Illana Gozes, who discovered ADNP and NAP) and is now in development as CP201 for ADNP syndrome (Helsmoortel-Van der Aa syndrome), a rare genetic neurodevelopmental disorder. CP201 holds U.S. FDA orphan-drug and rare-pediatric-disease designations and EMA orphan status, and a pediatric phase 3 program began in late 2024. Davunetide is not approved for any indication and is best understood today as an investigational, microtubule-stabilizing neuroprotective peptide with a cautionary efficacy record.
Regulatory Status
Davunetide has no marketing approval for any indication. Its pivotal phase 2/3 trial in progressive supranuclear palsy (2014) was negative. As CP201 (intranasal davunetide) it holds U.S. FDA orphan-drug and rare-pediatric-disease designations and EMA orphan-drug status for ADNP syndrome, with a pediatric phase 3 program initiated in late 2024. It is not on the FDA 503A bulk-substances list; any other human use is investigational and unapproved.
Effective: June 2026
View FDA SourceWhy Researchers Study It
Davunetide is one of the few clinically tested peptides that acts directly on the neuronal cytoskeleton, stabilizing microtubules and lowering tau hyperphosphorylation rather than modulating neurotransmitters. That places it at the center of tauopathy research and offers a mechanistic probe for how microtubule integrity relates to neurodegeneration. Its instructive failure in progressive supranuclear palsy, combined with its renewed, narrowly targeted development for the genetic disorder ADNP syndrome, makes it a case study in translating cytoskeletal neuroprotection from animal models to defined patient populations.
Proposed Mechanisms
- Derived from activity-dependent neuroprotective protein (ADNP), which glia release in response to vasoactive intestinal peptide (VIP)
- Promotes microtubule assembly and stability, partly via interaction with the microtubule end-binding proteins EB1 and EB3
- Reduces hyperphosphorylation of the tau protein, protecting against tauopathy in preclinical models
- Penetrates the cell nucleus and exerts pleiotropic effects on gene expression and cytoskeletal repair
- Shows preferential interaction with dynamic 3-repeat tau, proposed to explain differential protection across tauopathies
- Formulated for intranasal delivery to reach the central nervous system
Evidence Snapshot
| Study Type | Model | Outcome | Link |
|---|---|---|---|
| RCT (human, phase 2/3) | Progressive supranuclear palsy (PSP) — 313 patients, intranasal 30 mg twice daily, 52 weeks | Negative: davunetide did not slow progression on either primary endpoint (PSPRS, SEADL). Lancet Neurology 2014 | Source |
| Clinical (human, exploratory) | Amnestic mild cognitive impairment and schizophrenia (earlier AL-108/davunetide studies) | Reported short-term memory and functional signals; intranasal davunetide well tolerated but efficacy not established | Source |
| Preclinical (cell / animal) | Tau and microtubule models | NAP stabilizes microtubules via the tubulin pool and reduces tau hyperphosphorylation; neurotrophic and neuroprotective activity | Source |
| Preclinical (mechanism, 2023) | Cellular localization studies | Davunetide penetrates cell nuclei, helping explain its pleiotropic neuroprotective mechanisms | Source |
| Clinical program (ongoing, pediatric) | ADNP syndrome (Helsmoortel-Van der Aa) — CP201 intranasal, phase 3 begun late 2024 | Investigational; FDA orphan-drug and rare-pediatric-disease designations, EMA orphan status. No approval | Source |
Commonly Discussed Benefits
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Safety & Cautions
- The pivotal phase 2/3 trial in progressive supranuclear palsy (2014) was negative on both primary endpoints
- Human cognitive benefit remains unproven; earlier positive signals were exploratory and not confirmed
- Not FDA-approved for any condition — investigational only
- Active development is narrowly focused on the rare genetic disorder ADNP syndrome (CP201, pediatric)
- Long-term safety in healthy adults is not established; this is a research compound
- Some vendors market it as a research chemical outside any approved or studied indication
Comparisons
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Citations
- [1] Boxer AL et al. — Davunetide in patients with progressive supranuclear palsy: a randomised, double-blind, placebo-controlled phase 2/3 trial. Lancet Neurol. 2014 PubMed
- [2] Davunetide — therapeutic profile and trial history. ALZFORUM PubMed
- [3] Oz S et al. — The ADNP-derived peptide NAP modulates the tubulin pool. PMC 2012 PubMed
- [4] Gozes I et al. — NAP (Davunetide) penetrates cell nuclei, explaining pleiotropic mechanisms. Cells 2023 PubMed
- [5] Gozes I. — The ADNP Syndrome and CP201 (NAP): Potential and Hope. Front Neurol / PMC 2020 PubMed
- [6] Intranasal NAP (Davunetide): Neuroprotection and circadian rhythmicity. Adv Drug Deliv Rev / ScienceDirect 2025 PubMed
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