Cell energy problems linked to lasting memory deficits in aged rats
A compound targeting cells’ energy-producing structures restored memory when given four weeks after surgery in aged rats that also received morphine.
Our read
Mechanisms- Studied:
- Experiments in aged rats undergoing surgery with morphine
- What changed:
- SS-31 restored memory in aged rats when given four weeks after surgery with morphine
- The catch:
- The abstract omits SS-31 dose and treatment duration
- Why it’s aging research:
- It studies organisms or tissues that aged naturally.
Editor of record: Boris Djordjevic · AgingResearch.News
In an experiment in aged rats, researchers studied lasting memory problems after surgery with morphine given around the operation. They examined the hippocampus, a brain region involved in memory, and tested drugs targeting brain inflammation or mitochondria, the structures that produce energy inside cells.
Surgery and morphine exposure produced persistent mitochondrial dysfunction in the hippocampus, but not in the liver. Mitochondria produced energy less effectively and had less reserve capacity. Blocking an inflammatory signal at surgery reduced chemical stress and partly restored mitochondrial function. Giving the mitochondria-targeting compound SS-31 four weeks after surgery restored memory that depends on the hippocampus and normalized mitochondrial respiration. Measures of chemical damage to DNA and nerve-fiber disruption nevertheless remained elevated.
Why it matters
Persistent cognitive problems after surgery are a concern in older people. The authors identify mitochondrial energy production as a promising target for this complication.
Caveats
These were experiments in aged rats, not a test in people. The abstract does not report sample sizes or the dose or duration of SS-31 treatment.
The paper
The Ohio State University
Brain, Behavior, and Immunity, Aug 3, 2026, Open access
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