Microcystin-induced down-regulation of lymphocyte functions through reduced IL-2 mRNA stability

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Title
Microcystin-induced down-regulation of lymphocyte functions through reduced IL-2 mRNA stability
Author(s)
Sung Su Yea; Hwan Mook Kim; Hee Mock Oh; Kye Hyung Paik; Kyu Hwan Yang
Bibliographic Citation
Toxicology Letters, vol. 122, no. 1, pp. 21-31
Publication Year
2001
Abstract
Here we report that lymphocyte functions were down-regulated by cyanobacterial hepatotoxin microcystin. Treatment of three microcystin (MC) isotypes, MC-LR, MC-YR and nodularin, on B6C3F1 mouse splenocytes produced dose-dependent inhibition of in vitro polyclonal antibody response and lymphoproliferation to LPS. ConA-induced lymphoproliferative response was decreased by MC-YR and nodularin, but no significant effect was observed in the MC-LR treatment. Intraperitoneal administration of nodularin into B6C3F1 mice decreased humoral immune responses to sheep red blood cell (sRBC), and the inhibitory effect became severe when hepatic uptake of nodularin was blocked by rifampicin. Each MC 1 μM suppressed phorbol 12-myristate 13-acetate (PMA) plus ionomycin-induced IL-2 mRNA expression in splenocytes and thymocytes, but not in EL-4 mouse thymoma cells. To further characterize the mechanism for the reduced IL-2 mRNA level, IL-2 mRNA stability was measured using RT-PCR. Deprivation of PMA/ionomycin stimuli from activated splenocytes and blockade of new transcription resulted in destabilization of IL-2 mRNA, which was accelerated by MC treatment. These results demonstrated that MC down-regulated lymphocyte functions and the immunosuppression was mediated, at least in part, through decreased IL-2 mRNA stability.
Keyword
microcystinnodularinlymphocytesmRNA stabilityinterleukin-2
ISSN
0378-4274
Publisher
Elsevier
DOI
http://dx.doi.org/10.1016/S0378-4274(01)00339-3
Type
Article
Appears in Collections:
Synthetic Biology and Bioengineering Research Institute > Cell Factory Research Center > 1. Journal Articles
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