Dosage research on Epithalon

Preclinical research dose ranges

In published preclinical research on Epithalon (also written as Epitalon), administered dose ranges in rodent studies have most commonly fallen in the 0.1 to 5 microgram per animal range delivered subcutaneously or intranasally, with the seminal Anisimov-laboratory lifespan studies in mice using doses at the low end of this span (around 0.1 to 0.5 micrograms per animal per dosing day) over chronic multi-month protocols. The Drosophila melanogaster lifespan studies used micromolar concentrations in the feeding medium.

The neuronal-differentiation and neurotrophic literature has used in-vitro concentrations between 10 nanomolar and 1 micromolar in cell-culture media. Khavinson and colleagues have published on the neuronal effects of intranasal administration in rats using small absolute doses (typically less than 10 micrograms per administration) across multi-week observation windows.

The published Russian-gerontology literature has used a per-animal dose convention rather than the per-kilogram convention more common in Western preclinical research, which complicates direct comparison with other peptide research literatures. Investigators reading the Epithalon literature should note this convention and translate to per-kilogram dose equivalents using the reported animal body weights when comparing across literatures.

Dose-response considerations from the published literature

The published Epithalon literature has reported lifespan-extension effects in murine and Drosophila models at the low-end doses described above, with the dose-response relationship between absolute dose and lifespan endpoints described in the Anisimov lifespan-study series. The neuronal-differentiation in-vitro work has reported effects across the 10 nanomolar to 1 micromolar concentration range with the higher concentrations producing the more pronounced differentiation-marker effects.

No Phase 1 or Phase 2 dose-ranging trial of Epithalon has appeared in the indexed Western clinical-trial literature. A small number of Russian clinical-pilot reports exist in the gerontology literature but do not constitute Phase 1 dose-finding trials. The research community continues to rely on the rodent and in-vitro literature for dose-design inference.

Reconstitution math and per-vial dose calculation

A 10 mg lyophilised Epithalon vial reconstituted with 1 mL of bacteriostatic water yields a stock concentration of 10 mg per mL. From this stock, a research aliquot of 0.01 mL contains 100 micrograms; an aliquot of 0.001 mL would contain 10 micrograms (impractical to draw directly, so investigators further dilute the stock to a working concentration appropriate to the small absolute doses used in the published rodent protocols). Refrigerated storage at 2 to 8 degrees Celsius, protected from light, is the standard handling practice reported across the rodent in-vivo work.

Research-protocol design considerations

Protocol-design choices in the published Epithalon literature reflect several recurring considerations. Dose selection in murine lifespan studies anchors at the low microgram-per-animal range across chronic multi-month protocols. Neuronal-differentiation in-vitro studies anchor at nanomolar-to-micromolar concentrations in cell-culture media. The per-animal versus per-kilogram dose convention difference between Russian and Western preclinical research is a recurring source of confusion in cross-literature comparison.

Route of administration in the published rodent work most commonly uses subcutaneous injection. Intranasal administration appears in the neuronal and cognitive-endpoint literature where central-nervous-system exposure is the protocol requirement. Oral administration via feeding medium appears in Drosophila lifespan studies. Intravenous administration is uncommon.

Chronic multi-month protocols are standard for lifespan endpoints, reflecting the time scale over which the primary published endpoint is measured. Cyclical-dosing protocols (multi-week dosing followed by multi-week rest periods, repeated across the animal’s lifespan) appear in some of the Russian gerontology work, with the cyclical pattern reflecting an attempt to mimic the cyclical secretion patterns of the endogenous pineal-gland peptide that Epithalon was designed to model.

References

1. Khavinson VKh et al. Effect of epitalon on the lifespan increase in Drosophila melanogaster. Mechanisms of Ageing and Development, 2000. [PMID 11087911]
2. Anisimov VN et al. Effect of Epitalon on biomarkers of aging, life span and spontaneous tumor incidence in female Swiss-derived SHR mice. Biogerontology, 2003. [PMID 12049808]
3. Khavinson VKh et al. Effects of intranasal administration of epitalon on neuron activity in the rat neocortex. Neuroscience and Behavioral Physiology, 2007. [PMID 17955380]
4. Khavinson VKh et al. Short cell-penetrating peptides as a new class of biologically active substances. Bulletin of Experimental Biology and Medicine, 2014. [PMID 23876621]
5. Khavinson VKh et al. Effect of short peptides on neuronal differentiation of stem cells. Bulletin of Experimental Biology and Medicine, 2019. [PMID 30791821]
6. Khavinson VKh et al. Peptides regulating proliferative activity and inflammatory pathways. International Journal of Molecular Sciences, 2022. [PMID 35408963]