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Title 

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

Authors 

Sung Su YeaHwan Mook KimHee Mock OhKye Hyung PaikKyu Hwan Yang

Publisher 

Elsevier

Issue Date 

2001

Citation 

Toxicology Letters, vol. 122, no. 1, pp. 21-31

Keywords 

microcystinnodularinlymphocytesinterleukin-2mRNA stability

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.

ISSN 

0378-4274

Link 

http://dx.doi.org/10.1016/S0378-4274(01)00339-3

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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