Comparison of Human Memory CD8 T Cell Responses to Adenoviral Proteins
Author Information
Author(s): Amita Joshi, Biwei Zhao, Cara Romanowski, David Rosen, Phyllis Flomenberg, Derya Unutmaz
Primary Institution: Thomas Jefferson University
Hypothesis
Cytotoxic T cells targeted to the late protein hexon may be inefficient in vivo due to the early Ad protein E3-19K downregulating HLA class I antigens.
Conclusion
Central memory type DNA polymerase CTLs dominate the lymphoid compartment and kill infected cells earlier than hexon-specific CTLs.
Supporting Evidence
- P-977+CD8+ T cells were detected at lower frequencies than H-892+CD8+ T cells in peripheral blood.
- Tonsil samples showed significantly higher frequencies of P-977+CD8+ T cells compared to H-892+CD8+ T cells.
- Early P-977 CTLs lysed targets as early as 8 hours post infection, while H-892 CTLs required IFN-γ pretreatment.
Takeaway
This study shows that some immune cells can recognize and attack viruses faster than others, which could help in treating infections.
Methodology
CD8+ T cells were analyzed from peripheral blood and tonsils using epitope-specific pentamers and flow cytometry.
Potential Biases
Potential bias due to the limited number of donors and reliance on specific epitopes.
Limitations
The small sample size limits the generalizability of the findings.
Participant Demographics
Nine HLA A2-positive donors, including healthy adults and SCT recipients.
Statistical Information
P-Value
0.03
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website