Study wrapper · #381
[Circannual rhythms of bone marrow cell composition in animals during aging: the role of pineal factors].
Editor's note
This animal study examined whether pineal factors — the peptides epithalamin and epithalon (epitalon) and the hormone melatonin — could restore age-disrupted yearly (circannual) rhythms of several bone-marrow cell populations in mice. Researchers reported that old mice lost or distorted the seasonal fluctuations of stromal and granulocyte-macrophage precursor cells and certain immune-cell subsets, and that epithalamin injections partly restored several of these rhythms, while epithalon influenced two precursor-cell rhythms at a smaller dose; melatonin's effects were seen mainly in adult, not old, mice. This is preclinical in-vivo work with cell-population and rhythm endpoints, not a clinical outcome, and epithalamin (the extract) appears to carry most of the reported effect, with epitalon a secondary player. The abstract is descriptive and gives no effect sizes. It fits epitalon's circadian/immune research theme from the originating lineage. Human data are needed before any conclusions can be drawn.
Plain-language abstract
This animal study looked at whether substances from the pineal gland — the peptides epithalamin and epithalon (epitalon) and the hormone melatonin — could restore normal yearly rhythms in the bone marrow of aging mice. Bone marrow makes blood and immune cells, and the amounts of several cell types normally rise and fall across the seasons. In old mice, these seasonal patterns were lost, distorted, or thrown out of sync. Researchers reported that injections of epithalamin in old mice restored several of these rhythms — for example, bringing back seasonal differences in certain immune cells and precursor cells. Epithalon affected two of the precursor-cell rhythms, and did so at a smaller dose. Melatonin mainly changed cell counts in younger adult mice, not old ones. This was a study in mice measuring cell populations and their rhythms, not a clinical study; it reported no side-effect data and does not show effects in people.