FGL Research Reference

Catalog classification, reference sizes, lab math links, and source-backed data. Educational use only — not medical advice.

Researched for: NCAM signaling and neural plasticity

Neuro Research peptide Lyophilized verified

Also known as: FGL peptide, NCAM mimetic peptide

Quick Facts

Reference Sizes
2 mg, 5 mg
Calculator
Preset available
Storage
Use source-label storage wording. Track lot, storage location, and open/reconstitution date.
Solubility
Lyophilized; reconstitute in sterile water or PBS; water-soluble 15-mer

Catalog Description

FGL ("FG-loop" peptide) is a synthetic mimetic of the FG-loop region of the second fibronectin type III module of NCAM (neural cell adhesion molecule), corresponding to its binding site for fibroblast growth factor receptor 1 (FGFR1). Preclinical studies report that FGL restores FGFR1, CaMKII, and CaMKIV phosphorylation in NCAM-deficient mice, promotes neuronal survival in vitro, enhances spatial learning and memory in rats, facilitates long-term synaptic plasticity in the dentate gyrus, and mobilizes neural stem cells both in vitro and in vivo. Separate work found FGL exerts anti-inflammatory effects in the aged rat hippocampus by promoting CD200 ligand expression while attenuating glial activation and pro-inflammatory cytokine production, and improves spatial learning deficits following neonatal phencyclidine treatment (a schizophrenia-relevant model) in rats. All published research is preclinical (rodent and in vitro); no human trials have been identified.

Catalog descriptions reflect research context only. Not a medical claim or treatment recommendation.

Research Profile

Half-Life
Formal human plasma half-life has not been established. In animal studies, FGL remained detectable in blood and cerebrospinal fluid for up to 5 hours after intranasal or subcutaneous administration; human intranasal trials in healthy volunteers showed a dose-related pharmacokinetic profile without a published half-life figure.
Onset
Neural and behavioral endpoints were assessed over days to weeks in animal models
Administration Routes (Research)
Subcutaneous (SC)Intraperitoneal (IP)Subcutaneous (SC) — preclinicalIntravenous (IV) — preclinical toxicity

Reported Research Effects

Reported Research Side Effects

Data source: Preclinical NCAM-mimetic studies

Reflects preclinical/research literature context only. Not a medical claim, dosing instruction, or treatment recommendation.

Route-Specific Research Protocols

Amounts and schedules are separated by administration route. Evidence badges distinguish labels, human studies, preclinical work, community reports, and evidence gaps.

Label / guideline Human study Community only Preclinical only Not established
Subcutaneous (SC) Not established

No human dosing protocol is established; published work uses species-specific preclinical regimens

Frequency / timing
Study-specific
Duration / setting
Study-specific
Technique
IP or SC
Evidence
No established protocol

Context: preclinical NCAM-mimetic literature

Formulation: Route-specific sterile formulation and professional handling requirements apply; concentration cannot be inferred from an oral or topical product.

Route safety: No route-specific protocol is established. Do not infer an amount from another route, component, or formulation.

Intraperitoneal (IP) Not established

No route-specific amount established in the reviewed record.

Technique
IP
Evidence
Route noted; protocol not established

Context: The catalog identifies this route, but its reviewed sources do not establish a separate amount and schedule for it.

Route safety: No route-specific protocol is established. Do not infer an amount from another route, component, or formulation.

Subcutaneous (SC) — preclinical Preclinical only

10 mg/kg FGLs

Frequency / timing
Once
Duration / setting
Single-dose pharmacokinetic/behavioral study
Technique
Single SC injection in non-human primates
Evidence
Preclinical protocol

Context: Six previously untreated monkeys received FGLs in 0.9% saline

Formulation: FGLs diluted in 0.9% saline for an animal experiment

Route safety: Non-human-primate exposure only. It is not a human dose and cannot be converted to IV, oral, or another route.

Intravenous (IV) — preclinical toxicity Preclinical only

25-2000 mg/kg/day

Frequency / timing
Once daily
Duration / setting
2-3 days for escalation; 7 days at the fixed dose
Technique
IV bolus in a rat dose-range/toxicity program
Evidence
Preclinical toxicity exposure

Context: European translational-development toxicity program, not an efficacy protocol

Formulation: Experimental FGLs IV preparation

Route safety: Animal toxicity-testing exposure, not an efficacy dose or human protocol. Do not convert this unusually high range to any other route.

Do not convert an amount between routes. Bioavailability, formulation, sterility, monitoring, and clinical context differ by route. Research-use context only; independently verify every cited source.

Research Notes

The earlier ug-to-mg/kg range was too vague to function as a protocol. No controlled human study supports a dose route or cycle.

Supplementary research context only. Not medical advice or a treatment recommendation.

Sources

FGL effects on aged-rat synapses — PubMed (NIH)
https://pubmed.ncbi.nlm.nih.gov/18215229/
FGL anti-inflammatory properties — PubMed (NIH)
https://pubmed.ncbi.nlm.nih.gov/19457161/
FGL neural-stem-cell study — PubMed (NIH)
https://pubmed.ncbi.nlm.nih.gov/24817672/
Neural cell adhesion molecule peptide mimetics modulate emotionality — Psychopharmacology / PubMed Central
https://pmc.ncbi.nlm.nih.gov/articles/PMC6300554/
Development of a novel FGL therapy and translational tests — European Commission CORDIS
https://cordis.europa.eu/project/id/278006/reporting

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Research Use Only. All content is for educational and research reference only. Not medical advice, a treatment recommendation, or guidance on human use. Compounds are not FDA-approved drugs unless specifically noted.

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