Trial reportAlzheimer's research & therapy2025
Inhibition of FAM19A5 reverses synaptic loss and cognitive decline in mouse models of Alzheimer's disease.
Trial report in Alzheimer's research & therapy, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT05143463 (A Phase 1, Randomized, Placebo-controlled, Double-blind, Single Ascending Dose Study to Assess the Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of Intravenous NS101 Infusion in Healthy Volunteers), which is not on this map. Cited by 2 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
A Phase 1, Randomized, Placebo-controlled, Double-blind, Single Ascending Dose Study to Assess the Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of Intravenous NS101 Infusion in Healthy Volunteers
Who cites it
2 citing papers in PubMed.
- The Effect of miR-1273d Between Chronic Childhood Stress and Positive Symptoms in Schizophrenia: A Preliminary Mediation Analysis.Neuropsychiatric disease and treatment · 2026Article
- Synaptic sabotage: How Tau and α-Synuclein undermine synaptic health.The Journal of cell biology · 2025Review
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
21 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundFAM19A5 is a secretory protein primarily expressed in neurons. Although its role in synaptic function has been suggested, the precise molecular mechanisms underlying its effects at the synapse remain unclear. Given that synaptic loss is a critical hallmark of Alzheimer's disease (AD), elucidating the mechanisms involving FAM19A5 could provide valuable insights into reversing synaptic loss in AD.
methodsThe binding partner of FAM19A5 was identified through co-immunoprecipitation experiments of mouse brain tissue. The effect of FAM19A5 on spine density in hippocampal neurons was evaluated using immunocytochemistry by overexpressing FAM19A5, treating neurons with FAM19A5 protein, and/or an anti-FAM19A5 antibody NS101. Target engagement of NS101 was determined by measuring FAM19A5 levels in mouse, rat, and human plasma at specific time points post NS101 injection using ELISA. Changes in spine density and dynamics in P301S tauopathy mice were assessed via Golgi staining and two-photon microscopy after NS101 administration. The synaptic strengthening of hippocampal neurons in APP/PS1 amyloidopathy mice after NS101 treatment was assessed by measuring miniature excitatory postsynaptic currents (mEPSCs) and field excitatory postsynaptic potentials (fEPSPs). Cognitive performance in AD mice after NS101 treatment was measured using the Y-maze and Morris water maze tests.
resultsFAM19A5 binds to LRRC4B, a postsynaptic adhesion molecule, leading to reductions in spine density in mouse hippocampal neurons. Inhibiting FAM19A5 function with NS101 increased spine density. Intravenous administration of NS101 increased spine density in the prefrontal cortex of P301S mice, which initially showed reduced spine density compared to wild-type (WT) mice. NS101 normalized the spine elimination rate in P301S mice, restoring the net spine count to levels comparable to WT mice. NS101 treatment enhanced the frequency of mEPSCs and fEPSPs in the hippocampal synapses of APP/PS1 mice, leading to improved cognitive function. The increases in plasma FAM19A5 levels upon systemic NS101 administration suggest that the antibody effectively engages its target and facilitates the transport of FAM19A5 from the brain.
conclusionsThis study demonstrated that inhibiting FAM19A5 function with an anti-FAM19A5 antibody restores synaptic integrity and enhances cognitive function in AD, suggesting a novel therapeutic strategy for AD.
trial registrationhttps://clinicaltrials.gov/study/NCT05143463 , Identifier: NCT05143463, Release date: 3 December 2021.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.