6533b862fe1ef96bd12c773e
RESEARCH PRODUCT
Clostridium difficile toxins A and B inhibit human immune response in vitro
E LeiserC. Von Eichel-streiberW DäubenerU. Haddingsubject
Interleukin 2Cellular immunityT-LymphocytesBacterial ToxinsImmunologyEnterotoxinIn Vitro TechniquesBiologyLymphocyte ActivationMicrobiologyMonocytesMicrobiologyEnterotoxinsImmune systemBacterial ProteinsAntigenmedicineHumansMonocytePseudomembranous colitisClostridium difficileInfectious Diseasesmedicine.anatomical_structureInterleukin-2ParasitologyMitogensResearch Articlemedicine.drugdescription
Two Clostridium difficile toxins isolated from strain VPI 10463 were tested for their effect on different human T-cell proliferation systems. In mitogen- and antigen-driven T-cell proliferation systems, toxins inhibited the proliferative response in a dose-dependent fashion. In interleukin-2-driven culture systems, no effect of toxins could be found on preactivated T cells. We suspected that monocytes were the influenced cells, since in antigen- and mitogen-driven systems monocytes were necessary for the proliferative response, whereas the interleukin-2-driven system was independent of monocytes. To prove this concept, purified monocytes were treated with toxins. The treatment was found to markedly reduce the capacity of monocytes to stimulate T-cell proliferation. No inhibition of the proliferative response was measured when, instead of monocytes, resting or preactivated T cells were treated with toxins. These experiments clearly show that C. difficile toxins interact with monocytes and not with T cells. The effect of toxins on cells of the immune system might be one factor in the development of pseudomembranous colitis.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1988-05-01 | Infection and Immunity |