Journal article
Blocking of mixed lymphocyte reaction by spleen cells from total lymphoid-irradiated mice involves interruption of the IL-2 pathway
The Journal of immunology (1950), Vol.148(2), pp.354-359
01/15/1992
DOI: 10.4049/jimmunol.148.2.354
PMID: 1530859
Abstract
Treatment with total lymphoid irradiation (TLI) before organ transplantation results in high incidences of donor-specific tolerance. However, the exact mechanism of how TLI induces or maintains tolerance is not known. In many experimental systems of tolerance, lack of IL-2 plays a central role in tolerance induction, as stimulation of immunocompetent cells with Ag in an insufficient IL-2 environment results in tolerance. To examine whether tolerance induction by TLI might involve the IL-2 pathway, we examined how TLI cells affect the ability of immunocompetent cells to produce IL-2 and express IL-2R in the MLR. Responder cells from MLR cultures in which cells from TLI-treated mice were added proliferated 50 to 70% less and produced 68 to 94% less IL-2 bioactivity than responder cells from control cultures. However, coculture of TLI cells into MLR did not alter IL-2R expression on responder cells, as measured by two-color FACS analysis. We found no evidence that TLI cells deleted MLR responder cells. Interestingly, exogenous IL-2 did not restore proliferation of MLR responder cells. These results suggest that TLI may induce tolerance by interrupting the IL-2 pathway in immunocompetent cells. Moreover, that exogenous IL-2 failed to restore immunocompetence suggests that tolerance in the TLI model may be easy to induce and very stable, and provides a rationale for the higher incidences of donor-specific tolerance after TLI treatment.
Details
- Title: Subtitle
- Blocking of mixed lymphocyte reaction by spleen cells from total lymphoid-irradiated mice involves interruption of the IL-2 pathway
- Creators
- Elizabeth H Field - Department of Medicine, University of Iowa College of Medicine, Iowa CityGail C Becker
- Resource Type
- Journal article
- Publication Details
- The Journal of immunology (1950), Vol.148(2), pp.354-359
- DOI
- 10.4049/jimmunol.148.2.354
- PMID
- 1530859
- NLM abbreviation
- J Immunol
- ISSN
- 0022-1767
- eISSN
- 1550-6606
- Grant note
- CA 45541-05 / NCI NIH HHS
- Language
- English
- Date published
- 01/15/1992
- Academic Unit
- Immunology; Internal Medicine
- Record Identifier
- 9984094732402771
Metrics
22 Record Views