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. 1990 Nov;82(2):214–220. doi: 10.1111/j.1365-2249.1990.tb05429.x

Induction and increase of HLA-DR antigen expression by immune interferon on ML-3 cell line enhances the anti-HLA-DR immunotoxin activity.

M Chiron 1, J P Jaffrezou 1, P Carayon 1, C Bordier 1, F Roubinet 1, C Xavier 1, M Brandely 1, G Laurent 1
PMCID: PMC1535130  PMID: 2122930

Abstract

In order to evaluate the impact of induction and increase target antigen expression on immunotoxin potency, we measured the potentiating effect of recombinant immune interferon-gamma (rIFN-gamma) on the cytotoxicity of an anti HLA-DR ricin A-chain immunotoxin (2G5 RTA-IT) on the myeloid cell line ML-3. After 48 h of incubation with rIFN-gamma (500 U/ml) the percentage of 2G5-positive cells increased from 40% to 79%, and the 2G5 mean density was enhanced by 10-fold (11,000 versus 110,000 molecules/cell). Concurrently, rIFN-gamma pretreatment induced a dramatic improvement of 2G5 RTA-IT dose-effect cytotoxicity, as well as immunotoxin cytotoxicity kinetics. When 2G5 RTA-IT was used at the optimal dose of 10(-8)M (the maximum dose which avoided non-specific ricin A-chain cytotoxicity), the immunotoxin-induced cell kill increased with the percentage of DR-positive ML-3 cells according to a similar linear-logarithmic function of rIFN-gamma concentration. Moreover, in the same range of rIFN-gamma concentrations, the killing values and the percentage of DR-positive ML-3 cells were similar if not identical. These findings imply that the enhancement of 2G5 RTA-IT cytotoxicity by rIFN-gamma is mainly related to the rIFN-gamma 2G5 antigen induction on HLA-DR negative cells when immunotoxin was used at 10(-8) M. Furthermore, 2G5 RTA-IT dose-effect cytotoxicity on DR-expressing ML-3 cells, when used at lower concentrations, was also increased by rIFN-gamma in a dose-dependent manner. This result suggests that for immunotoxin concentrations close to the limiting membrane saturation dose (10(-10)M), rIFN-gamma may not solely act by inducing HLA-DR expression on DR-negative ML-3 subpopulation but also by increasing individual cellular DR density on DR expressing ML-3 cells. Finally, our study showed that immunotoxin potency on malignant cell populations which display an heterogeneous antigen expression, could be greatly improved by the use of rIFN-gamma.

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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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