Human umbilical cord plasma proteins revitalize hippocampal function in aged mice.
Level 5 - mechanism / opinion, no new human data
Preclinical animal and ex vivo laboratory research
PubMed 28424512 · doi:10.1038/nature22067
What was done
Researchers tested whether systemic administration of human umbilical cord plasma could reverse age-related hippocampal decline in aged mice. They identified tissue inhibitor of metalloproteinases 2 (TIMP2) as a factor enriched in cord plasma, young mouse plasma, and young mouse hippocampi. They evaluated brain penetration, synaptic plasticity (long-term potentiation), and hippocampal-dependent cognitive performance in aged mice following treatment with human cord plasma or TIMP2, assessed outcomes following TIMP2 depletion, tested whether systemic TIMP2 is required for spatial memory in young mice, and applied TIMP2-neutralizing antibodies to ex vivo brain slices.
What was found
No numerical values or effect sizes were reported in the abstract. Treatment with human cord plasma revitalized hippocampal function and improved cognitive performance in aged mice. Systemically administered TIMP2 crossed into the brain, increased synaptic plasticity, and enhanced hippocampal-dependent cognition in aged mice. Depleting TIMP2 eliminated the cognitive benefits of cord plasma. In young mice, systemic pools of TIMP2 were necessary for spatial memory, and treating brain slices with TIMP2 antibody blocked long-term potentiation.
Why it matters
This study identifies human cord plasma and specifically blood-borne TIMP2 as systemic factors capable of enhancing hippocampal synaptic plasticity and reversing cognitive deficits in aged animal models.
Limits
The abstract provides no sample sizes, numerical values, or statistical metrics. Findings are restricted to rodent and ex vivo tissue models, leaving human clinical efficacy and safety unestablished.
Cited by
- supports Blood plasma from young humans mimics the brain-rejuvenating effects of young mouse blood when injected into aged mice.