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. 1989 Apr;76(1):126–131.

Unresponsiveness to Con A in spleen cell cultures of M. lepraemurium-infected mice is dependent on a defective expression of high-affinity IL-2 receptors rather than on a lack of IL-2 production.

R Turcotte 1, S Lemieux 1
PMCID: PMC1541722  PMID: 2661060

Abstract

The production of interleukin-2 (IL-2) by Con A-activated spleen cells (SC) progressively declined and reached negligible values during the course of infection of C57BL/6 mice with Mycobacterium lepraemurium. In addition, the capacity of cultured SC to utilize IL-2 was highly reduced, as demonstrated by the accumulation of IL-2 activity in culture supernatants at 48 and 72 h after Con A activation. The depressed IL-2 utilization started to be observed about 1 to 2 weeks prior to the onset of the depressed IL-2 production and was not reversed by the addition of exogenous IL-2; thus implying that a lack of IL-2 utilization rather than a lack of IL-2 production could be directly responsible for the inhibition of T-cell proliferative responses to Con A in SC cultures of infected mice. The utilization of IL-2 was found to be down-regulated, at least in part, by splenic suppressor cells since, in mixed-culture experiments, SC from infected mice actively depressed the capacity of normal splenocytes to consume IL-2. Finally, the depressed IL-2 utilization would result from a 2- to 3-fold reduction of either or both the density of high-affinity IL-2 receptors and their affinity for IL-2.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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