Summary
T cells taken from normal rats treated with an exogenous source of bacterial superantigen in vivo specifically failed to proliferate following re-stimulation with the same superantigen in vitro. Responsiveness was restored following the addition of an exogenous source of interleukin-2 indicating that the T cells had been made functionally tolerant and not deleted. While staphylococcal enterotoxin treatment of normal rats virtually abolished T-cell proliferation to the same enterotoxin in vitro, T cells from similarly treated diabetes-prone Biobreeding (BB-DP) rats were markedly resistant to this in vivo effect. Responses in BB-DP rats were never reduced by more than 50% even when a 4 times more effective dose of enterotoxin was employed. The resistance of BB-DP peripheral T cells to staphylococcal enterotoxin-induced tolerance could not be attributed to differences in T-cell receptor V beta chain family usage of BB-DP vs normal T cells but was associated with qualitative differences in the way in which BB-DP T cells responded to staphylococcal enterotoxins in vitro. While under optimal stimulatory conditions BB-DP T-cell proliferative responses to staphylococcal enterotoxins appeared comparable to those from non-diabetes-prone animals, under superoptimal conditions BB-DP, but not diabetes-resistant, donor T-cell proliferative responses to staphylococcal enterotoxins could be blocked in vitro with antibodies to CD4 antigens. In addition, BB-DP T-cell proliferative responses were more sensitive to suboptimal staphylococcal enterotoxin doses in vitro. We discuss ways in which abnormal BB-DP T-cell responses to superantigens in general and resistance to staphylococcal enterotoxin-mediated tolerance induction in particular may play a role in the generation of a peripheral T-cell repertoire prone to autoimmunity.
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Abbreviations
- SE:
-
Staphylococcal enterotoxin
- BB-DP:
-
diabetes-prone Biobreeding rat
- WF:
-
Wistar Furth
- TCR:
-
T-cell receptor
- VΒ :
-
variable region beta chain
- CΒ :
-
constant region beta chain
- MMTV:
-
mouse mammary tumour virus
- SEB:
-
staphylococcal enterotoxin B
- SEA:
-
staphylococcal enterotoxin A
- SEE:
-
staphylococcal enterotoxin E
- SEC1:
-
staphylococcal enterotoxin C1
- rSEB:
-
recombinant staphylococcal enterotoxin B
- TSST:
-
toxic shock syndrome toxin
- FACS:
-
fluorescence activated cell sorter
- LN:
-
lymph node
- APC:
-
antigen presenting cell
- 3HTdR:
-
tritiated thymidine
- PCR:
-
polymerase chain reaction
- IL-2:
-
interleukin-2
- BB-DR:
-
Biobreeding diabetes-resistant
- RT1u, ConA:
-
concanavalin A
- mAb:
-
monoclonal antibody
- CD4 :
-
T-cell differentiation antigen
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Sellins, K.S., Gold, D.P. & Bellgrau, D. Resistance to tolerance induction in the diabetes-prone Biobreeding rat as one manifestation of abnormal responses to superantigens. Diabetologia 39, 28–36 (1996). https://doi.org/10.1007/BF00400410
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DOI: https://doi.org/10.1007/BF00400410