Impact of cold exposure duration and intensity on hippocampal tyrosine hydroxylase, brain-derived neurotrophic factor, and mitochondrial markers in mice.
Level 5 - mechanism / opinion, no new human data
Animal research (controlled laboratory study in mice)
PubMed 40752721 · doi:10.1016/j.expneurol.2025.115407
What was done
Mice were subjected to repeated cold-water immersion at 4 °C five times per week for four weeks across four protocol variations defined by immersion duration (3 versus 6 minutes) and body exposure (partial versus whole-body immersion). Researchers measured blood corticosterone concentrations immediately after the 10th and 20th exposures and analyzed hippocampal levels of tyrosine hydroxylase (TH), brain-derived neurotrophic factor (BDNF), cytochrome c oxidase subunit I, A kinase anchor protein 1 (AKAP1), and related signaling proteins.
What was found
Blood corticosterone increased to a similar extent across all cold-exposed groups after the 10th and 20th sessions. The abstract reports no numerical values, effect sizes, or variance estimates. Qualitatively, BDNF signaling was activated by weaker stimuli, IGF-1 was activated under heavier stress conditions, and intermediate stimulation intensity increased hippocampal TH protein content alongside elevated mitochondrial markers.
Why it matters
This study shows that neuroprotective and metabolic signaling in the rodent hippocampus varies by cold exposure dose (duration and depth) independently of general systemic corticosterone elevation.
Limits
The total sample size and group sizes are not reported in the abstract. The findings are restricted to mice and lack quantitative data or statistical significance values in the text. Functional cognitive, behavioral, and clinical translational outcomes were not assessed.
Cited by
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