Effects of trichothecene structure on cytokine secretion and gene expression in murine CD4+ T-cells.
The effects of trichothecene structure on cytokine secretion and gene expression were assessed in primary CD4+ T-cells from murine spleen. CD4+ T-cells were stimulated with concanavalin A (Con A) for 2 or 7 days in the presence of various concentrations of the trichothecenes, vomitoxin (VT or deoxynivalenol), nivalenol (NIV), 15-acetyl deoxynivalenol (15-ADON), 3-acetyl deoxynivalenol (3-ADON), T-2 toxin (T-2) and verrucarin A (Ver A). Culture supernatants were subsequently analyzed for interleukin (IL)-2, IL-4 and IL-5 by ELISA. At day 2, all trichothecenes were found to have inhibited production of IL-2, IL-4, and IL-5. However, at day 7, supernatant IL-2 was significantly increased (2-5.5-fold) in cultures containing VT, NIV, 3-ADON, and 15-ADON at 250, 250, 2500, and 1000 ng/ml doses, respectively, when compared to control Con A-stimulated cultures; significant increases in IL-2 were not observed with T-2 and Ver-A. Similarly, at day 7, IL-4 and IL-5 were significantly increased in the presence of VT (100 ng/ml), NIV (100 ng/ml), 3-ADON (1000 ng/ml), 15-ADON (500 ng/ml), T-2 (1 ng/ml), and Ver A (50 pg/ml, only IL-5) when compared to control cultures. IL production was inhibited at trichothecene concentrations exceeding the aforementioned optima. When total RNA of 2-day cultures was assessed by reverse transcriptase polymerase chain reaction (RT-PCR) in conjunction with Southern analysis, IL-2 mRNA was also found to be superinduced by VT (50 and 100 ng/ml), NIV (50, 100 and 250 ng/ml), 3-ADON (1500 ng/ml), 15-ADON (100 ng/ml), T-2 (0.5 ng/ml) and Ver A (25, 50 and 100 pg/ml); IL-4 mRNA by VT (50 ng/ml), NIV (50 ng/ml), and Ver A (25, 50 and 100 pg/ml); IL-5 mRNA by VT (50 ng/ml); and IL-6 mRNA by 15-ADON (100 ng/ml) and Ver A (50 pg/ml). As the trichothecene concentration increased from these levels, inhibition of mRNA transcript levels was also observed for many of the interleukins. Taken together, the results suggest that trichothecenes as a group can either inhibit or superinduce both IL secretion and mRNA levels in CD4+ T-cells. Superinduction exhibited a rank order of macrocyclic > type A > type B trichothecenes and was dependent on acylation of the trichothecene nucleus.
Ouyang
Y L
YL
Department of Food Science and Human Nutrition, Michigan State University, East Lansing, USA.
Azcona-Olivera
J I
JI
Pestka
J J
JJ
D000215:Acylation; D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000633:toxicity*; D015139:Blotting, Southern; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000187:drug effects* / Q000276:immunology; D002478:Cells, Cultured; D003208:Concanavalin A / Q000494:pharmacology; D016207:Cytokines / Q000096:biosynthesis* / Q000235:genetics; D004797:Enzyme-Linked Immunosorbent Assay; D005786:Gene Expression Regulation / Q000187:drug effects / Q000235:genetics*; D007376:Interleukin-2 / Q000096:biosynthesis / Q000235:genetics; D015847:Interleukin-4 / Q000096:biosynthesis / Q000235:genetics; D015848:Interleukin-5 / Q000096:biosynthesis / Q000235:genetics; D051379:Mice; D012333:RNA, Messenger / Q000096:biosynthesis; D013329:Structure-Activity Relationship; D013605:T-2 Toxin / Q000633:toxicity; D014158:Transcription, Genetic / Q000187:drug effects / Q000235:genetics; D014255:Trichothecenes / Q000737:chemistry / Q000633:toxicity*
D000903:Antibiotics, Antineoplastic; D016207:Cytokines; D007376:Interleukin-2; D015848:Interleukin-5; D012333:RNA, Messenger; D014255:Trichothecenes; D003208:Concanavalin A; D015847:Interleukin-4; C043247:3-acetyldeoxynivalenol; C046760:15-acetyldeoxynivalenol; D013605:T-2 Toxin; C007262:deoxynivalenol; C005348:muconomycin A