CLTA
Clathrin light chain A (Lca)
Publications[править]
A favorable incidence and severity of graft-vs-host disease is observed in patients transplanted with banked, unrelated, HLA-mismatched umbilical cord blood (UCB) grafts, while the incidence of malignant relapse remains low. CTLA-4 mediates negative T-cell signaling and may contribute to the development of allogeneic tolerance. In this study, we compared protein and mRNA expression of CTLA-4 in stimulated UCB and adult peripheral blood T cells. T cells were isolated from UCB and adult peripheral blood and stimulated with anti-CD3 and anti-CD28 monoclonal antibodies. Cells were immunostained and analyzed by flow cytometry for both surface and intracellular expression of CTLA-4 in the presence and absence of cyclosporin A, and kinetics of CTLA-4 expression compared. CTLA-4 mRNA expression was measured using quantitative real-time polymerase chain reaction. NFAT1 protein levels were measured by Western blot analysis. These studies demonstrate reduced surface and intracellular expression of CTLA-4 in stimulated UCB T cells compared to adult controls. Furthermore, reduced CTLA-4 protein expression in UCB T cells was noted to be in part transcriptionally regulated, as CTLA-4 mRNA levels also were significantly lower. Reduced CLTA-4 expression by UCB T cells followed the kinetics of delayed and reduced expression of the transcription factor NFAT1 by UCB T lymphocytes during primary stimulation. Moreover, cyclosporin A, which is known to modulate NFAT activation, reduced CTLA-4 protein expression in adult and UCB T cells. Reduced expression of the key regulatory proteins CTLA-4 and NFAT-1 may contribute to favorable UCB T lymphocyte allogeneic responses.
MeSH Terms
- Abatacept
- Adult
- Aging
- Antigens, CD
- Antigens, Differentiation
- CTLA-4 Antigen
- Cell Division
- Cyclosporine
- DNA-Binding Proteins
- Fetal Blood
- Flow Cytometry
- Gene Expression Regulation
- Graft vs Host Disease
- Hematopoietic Stem Cell Transplantation
- Humans
- Immune Tolerance
- Immunoconjugates
- Immunosuppressive Agents
- Infant, Newborn
- Lymphocyte Activation
- NFATC Transcription Factors
- Nuclear Proteins
- Polymerase Chain Reaction
- RNA, Messenger
- T-Lymphocytes
- Transcription Factors
- Transcription, Genetic