In vitro analysis of T cell-mediated cytotoxicity displayed by rat heart allograft recipients rendered unresponsive by total-lymphoid irradiation and extracted donor antigen

Journal Article · Thu Feb 01 00:00:00 EST 1990 · Transplantation; (USA)

DOI:https://doi.org/10.1097/00007890-199002000-00040· OSTI ID:6936781

Florence, L S; Jiang, G L; Ang, K K; Stepkowski, S M; Kahan, B D ^[1]

---

1. Univ. of Texas Medical School, Houston (USA)

The addition of 3M KCl-extracted donor antigen (HAg) to immunosuppressive therapy with 16 Gy total lymphoid irradiation produces a significantly higher fraction of Wistar-Furth (WFu) recipients displaying indefinite survival of heterotopic buffalo (BUF) heart allografts, namely 80 versus 20%. The experiments presented herein analyzed the direct activity as well as estimated the potential precursor numbers at 1 and 3 months in treated recipients. At 1 month post-TLI/HAg therapy, recipients showed reduced proliferative responses in mixed lymphocyte reactions (MLR) in a specific pattern toward donor but not third-party stimulators. Both TLI/Graft and TLI/HAg/Graft groups showed a higher frequency of BUF antigen-directed T-cytotoxic cells (fTc) than TLI-treated, but nontransplanted, WFu hosts. In addition, the TLI/HAg group alone displayed alloantigen-specific suppressor cells that suppressed the MLR proliferative responses of normal spleen T cells against donor, but not third-party, alloantigens. At 3 months postirradition, both TLI/Graft and TLI/HAg/Graft groups displayed variable MLR proliferative responses toward donor and third-party alloantigens. Whereas nontransplanted, TLI-treated WFu rats recovered their fTc to normal levels at 3 months, the TLI and TLI/HAg treated recipients bearing functional heart allografts demonstrated significantly decreased splenic fTc. These results show that reduced numbers of cytotoxic cell precursors may afford more reliable indices of prolonged heart allograft survival than MLR responses. The observations suggest that TLI/HAg transplant hosts display both reduced cytotoxic precursors and activated suppressor elements.

• OSTI ID: 6936781
• Journal Information: Transplantation; (USA), Vol. 49:2; ISSN 0041-1337
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
HEART
TRANSPLANTS
IMMUNITY
RADIOINDUCTION
LYMPHOCYTES
CELL PROLIFERATION
ANTIGENS
GRAFT-HOST REACTION
IMMUNOSUPPRESSION
IN VITRO
LYMPH NODES
LYMPHATIC SYSTEM
RATS
SPLEEN
SURVIVAL TIME
WHOLE-BODY IRRADIATION
ANIMAL CELLS
ANIMALS
BIOLOGICAL MATERIALS
BLOOD
BLOOD CELLS
BODY
BODY FLUIDS
CARDIOVASCULAR SYSTEM
CONNECTIVE TISSUE CELLS
EXTERNAL IRRADIATION
IRRADIATION
LEUKOCYTES
MAMMALS
MATERIALS
ORGANS
RODENTS
SOMATIC CELLS
VERTEBRATES
560152* - Radiation Effects on Animals- Animals