The aged immune system is characterized by clonal expansions of CD8+ T cells of which a substantial portion are directed against Epstein-Barr virus (EBV) and cytomegalovirus (CMV). It is unknown if these expansions represent increased viral reactivation or simply reflect an accumulation over time. We investigated herpesvirus reactivation in young and old subjects co-infected with CMV and EBV. Using molecular and serological techniques, we found significant increases in both the frequency and magnitude of EBV and CMV reactivation in elderly subjects. CMV DNA was frequently detected in the urine of elderly subjects; EBV load in peripheral blood was also significantly increased. Notably, EBV DNA in plasma was detected in a majority of the elderly subjects which was supported by frequent transcription of late structural genes. Furthermore, CD8+ T cells specific for EBV structural antigens were detected in samples from the elderly. Samples from our younger control group were negative for EBV DNA in plasma, CMV DNA in urine, expression of structural transcripts, and lacked CD8+ T cells specific for EBV structural antigens. These findings indicate that the aged immune system is no longer able to control EBV and CMV reactivation that could now be characterized as chronic instead of latent.
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http://dx.doi.org/10.1016/j.exger.2007.01.005 | DOI Listing |
J Neuroinflammation
December 2024
Research Institute for Medicines (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Lisboa, Portugal.
Multiple Sclerosis (MS), a neuroinflammatory disease of the central nervous system, is one of the commonest causes of non-traumatic disability among young adults. Impaired cognition arises as an impactful symptom affecting more than 50% of the patients and with substantial impact on social, economic, and individual wellbeing. Despite the lack of therapeutic strategies, many efforts have been made to understand the mechanisms behind cognitive impairment in MS patients.
View Article and Find Full Text PDFExp Mol Med
January 2025
Department of Thoracic Surgery, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
Esophageal squamous cell carcinoma (ESCC) patients often face a grim prognosis due to lymph node metastasis. However, a comprehensive understanding of the cellular and molecular characteristics of metastatic lymph nodes in ESCC remains elusive. In this study involving 12 metastatic ESCC patients, we employed single-cell sequencing, spatial transcriptomics (ST), and multiplex immunohistochemistry (mIHC) to explore the spatial and molecular attributes of primary tumor samples, adjacent tissues, metastatic and non-metastatic lymph nodes.
View Article and Find Full Text PDFIn Vivo
December 2024
Immunotherapy Division, Shizuoka Cancer Center Research Institute, Shizuoka, Japan;
Background/aim: Immune checkpoint blockade has achieved great success as a targeted immunotherapy for solid cancers. However, small molecules that inhibit programmed death 1/programmed death ligand 1 (PD-1/PD-L1) binding are still being developed and have several advantages, such as high bioavailability. Previously, we reported a novel PD-1/PD-L1-inhibiting small compound, SCL-1, which showed potent antitumor effects on PD-L1 tumors.
View Article and Find Full Text PDFCancer Lett
December 2024
Department of Medicine, Section of Epidemiology and Population Sciences, Dan L Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX 77030, USA. Electronic address:
The p53 tumor suppressor is commonly mutated in cancer; however, there are no effective treatments targeting p53 mutants. A DNA vaccine gWIZ-S237G targeting the p53 S237G mutant, which is highly expressed in A20 murine tumor cells, was developed and administered intramuscularly via electroporation, either alone or in combination with PD1 blockade. The anti-p53-S237G immunization elicited a robust protective response against subcutaneous A20 tumors and facilitated the infiltration of immune cells including CD8 T cells, NK cells, and DCs.
View Article and Find Full Text PDFBiomed Pharmacother
December 2024
Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, Debrecen 4032, Hungary; Doctoral School of Molecular Cell and Immune Biology, University of Debrecen, Debrecen 4032, Hungary; Dean's office, Faculty of Pharmacy, University of Debrecen, Debrecen 4032, Hungary. Electronic address:
ABCB1/MDR-1/P-glycoprotein (Pgp) is an ABC transporter responsible for cancer cell multi-drug resistance. It is expressed in cytotoxic T lymphocytes (CTL). Eliminating sensitive cancer cells during high-dose chemotherapy can also damage immune cells.
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