Age-related fat changes hinder human natural killer cells
Experiments in human natural killer cells linked age-related fat buildup to altered cell mechanics and weaker killing of target cells.
Our read
Mechanisms- Studied:
- Experiments in human natural killer cells
- What changed:
- Human natural killer cells accumulated fat with aging and killed target cells less effectively
- The catch:
- Target-cell killing in lab-grown cells is a proxy for immune surveillance
- In the record:
- One of 5 papers on ELOVL6 on record: none yet with results in people, 1 in animals.
Editor of record: Boris Djordjevic · AgingResearch.News
Human natural killer cells—immune cells that kill target cells—showed age-related fat buildup and altered physical properties in experiments. Their membranes were more fluid, and the supporting layer beneath the membrane was less stiff. They also organized contact sites with target cells poorly and killed those cells less effectively.
The researchers traced these changes to increased uptake of retinol, a form of vitamin A, and accumulation of retinoic acid, a molecule made from it. This activated a fat-making program involving SREBP1, a protein that controls gene activity, and ELOVL6, an enzyme involved in changing fatty acids. Inhibiting ELOVL6 restored membrane and supporting-layer mechanics and target-cell killing in cells grown in the lab. In mouse models, ELOVL6 inhibition also enhanced activity against tumors.
Why it matters
Immune surveillance declines with age. Targeting the machinery that shapes immune cells’ fats and physical properties may offer a way to address that decline.
Caveats
The restoration of cell mechanics and killing occurred in cells grown in the lab. The antitumor results came from mouse models, not people.
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