Spermidine supplementation (6 mg daily for 13 weeks) reversed immune senescence markers in older adults who failed to mount robust vaccine responses to a third SARS-CoV-2 dose, restoring autophagic function and significantly enhancing spike-specific antibodies and memory B-cell recall in non-responders. This pilot study identifies both a potential intervention and measurable biomarkers for predicting vaccine failure in aging populations.
Key Points
- Spermidine reversed p16, mTOR, and DNA damage signatures in vaccine non-responders
- Supplement enhanced spike-specific IgG, memory B cells, and neutralizing antibodies
- Senescence markers may predict poor vaccine responsiveness in older adults
Longevity Analysis
Immune senescence—the progressive deterioration of immune cell function with age—directly undermines one of the body's primary defense mechanisms against infection. This research demonstrates that cellular-level dysfunction driving vaccine failure is not fixed; it responds to targeted intervention. The restoration of autophagic flux in immune cells reveals how a simple dietary intervention can restore a fundamental cellular housekeeping mechanism that typically declines with age. For practitioners managing older patients, the identification of senescence markers as predictors of vaccine responsiveness transforms what has been an unpredictable outcome into something measurable and potentially modifiable before vaccination occurs.
Original published by Wiley Aging Cell, by Ghada Alsaleh, Mohammad Ali, Amir Hossein Kayvanjoo, Feng Liu, Tanaïs Moreau, Sagida Bibi, Lin Luo, Melissa Govender, Miles Carroll, Sebastian J. Hofer, Eisenberg Tobias, Christoph Magnes, Loren Kell, Christopher Chung, Yu Deng, Aneesha Bhandari, Lucy Garner, Thomas Conrad, Liye Chen, Barbara Kronsteiner‐Dobramysl, Susie Dunachie, Owen B. Spiller, Teresa Lambe, Paul Klenerman, Lucy C. Jones, A. Katharina Simon .