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Analysis of tolerance inducing mechanism after application of oncogen-transformed macrophages
A M Waaga1, J M Otte, M Krzymański
1Institute of Immunology, Christian Albrechts University, Kiel, Germany.
Abstract:
The purpose of this study was to examine the expression of T cell receptors (TCR) and their V beta subclasses under the influence of the parental cell line P388D1 and its clones mos2 and mos3, using a mouse model. It was shown, that v-mos oncogene-transformed cells of this line (mos2) induced selective immunological unresponsiveness in vitro. Because the induction of tolerance is of a central importance for the organ transplantation, this phenomenon, found in vitro, was also studied in vivo. We found that the in vivo injection of mos2 cells into mice induced a state of selective noncreativity. To further analyse these effects, we studied whether specific tolerance is the consequence of a decreased number of essential receptors or receptor families. For this purpose C57BL/6 mice were immunized with cells of the parental line P388D1 or mos2 and mos3 clones. Their spleen and thymus cells were examined phenotypically. The most impressive result of this study was a clearly changed amount of T cells receptors in mos2 immunized mice, in which a state of tolerance was induced. In these mice only the expression of CD3 T receptors as well as that of the V beta 11 chains was reduced. In spleen of these mice the CD3 expression was decreased, compared to D1 or nonimmunized control animals by 54-58% and compared to mos3 mice by 38-40%. Even though the differences in the thymus were not very pronounced, we still saw a decrease in CD3 stained cells selective in mos2 immunized C57B1/6. The expression of V beta 11 chains on the surface of spleen cells of mos2 animals was reduced by 33.3%, on the thymocytes even by 50% comparing to that in nonimmunized mice. Whether the reduced expression of T receptor V beta families is due to changes in the genetic material (cDNA), has to be studied.
Insights
Immunological tolerance was induced in mice by mos2 cells, leading to reduced T cell receptor (TCR) expression, specifically CD3 and V beta 11 chains. This finding is crucial for understanding organ transplantation and immune responses.
Area of Science:
- Immunology
- Oncology
- Transplantation Science
Background:
- The induction of immunological tolerance is critical for successful organ transplantation.
- Understanding the mechanisms behind immune tolerance can inform strategies to prevent transplant rejection.
- The v-mos oncogene-transformed cell line mos2 was previously shown to induce selective immunological unresponsiveness in vitro.
Purpose of the Study:
- To investigate the expression of T cell receptors (TCR) and their V beta subclasses in response to the P388D1 cell line and its clones mos2 and mos3.
- To determine if the in vitro-observed immunological unresponsiveness induced by mos2 cells translates to an in vivo state of tolerance.
- To analyze whether this specific tolerance is associated with a decreased number of essential TCRs or receptor families.
Main Methods:
- Utilized a mouse model (C57BL/6) for in vivo studies.
- Immunized mice with parental P388D1 cells or mos2 and mos3 clones.
- Phenotypically examined spleen and thymus cells to assess TCR expression, including CD3 and V beta subclasses.
Main Results:
- Injection of mos2 cells induced a state of selective nonresponsiveness in vivo.
- Mice immunized with mos2 cells exhibited significantly reduced expression of CD3 T cell receptors and V beta 11 chains in spleen and thymus.
- CD3 expression decreased by 54-58% in spleen compared to controls and by 38-40% compared to mos3-immunized mice.
- V beta 11 chain expression on spleen cells and thymocytes was reduced by 33.3% and 50%, respectively, in mos2-immunized mice.
Conclusions:
- The v-mos oncogene-transformed mos2 cells induce a state of specific immunological tolerance in vivo, characterized by reduced expression of CD3 and V beta 11 T cell receptors.
- These findings highlight a potential mechanism for immune modulation relevant to organ transplantation.
- Further research is needed to determine if these TCR expression changes are due to alterations in genetic material (cDNA).