Abstract
Purpose
We investigated the inhibitory effects of curcumin, curcumin derivatives and degradation products on OKT3-induced human peripheral blood mononuclear cell (PBMC) proliferation and the role of their radical scavenging activity.
Methods
OKT3-induced human PBMC proliferation was determined by measuring 3H-thymidine incorporation. Radical scavenging activity was evaluated by using an in vitro DPPH assay.
Results
OKT3-induced PBMC proliferation was inhibited by curcumin, isocurcumin, bisdesmethoxy-, diacetyl-, tetrahydro-, hexahydro-, and octahydrocurcumin as well as by vanillin, ferulic acid, and dihydroferulic acid with IC50-values of 2.8, 2.8, 6.4, 1.0, 25, 38, 82, 729, 457, and >1,000 μM, respectively. The investigated substances with the strongest effect on radical scavenging were tetrahydro-, hexahydro-, and octahydrocurcumin with IC50 values of 10.0, 11.7, and 12.3 μM, respectively. IC50-values of dihydroferulic acid, ferulic acid, and curcumin were 19.5, 37, and 40 μM. The substances with the lowest radical scavenging activities were vanillin, isocurcumin, diacetylcurcumin, and bisdesmethoxycurcumin with IC50 values higher than 100 μM each.
Conclusions
Curcuminoid-induced inhibition of OKT3-induced PBMC proliferation depends on the number of carbon atoms and double bonds of the 1,6-heptadiene-3,5-dione structure as well as on the phenolic ring substitutes of the curcuminoids but is not correlated to their respective radical scavenging activity.
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Abbreviations
- ABTS:
-
2,2-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid)
- DPPH:
-
1,1-diphenyl-2-picrylhydrazyl radical
- HBC:
-
2-hydroxypropyl-γ-cyclodextrin
- HHC:
-
hexahydrocurcumin
- IC50 :
-
halfmaximal inhibitory concentration
- JNK:
-
junN-terminal kinase
- NFκB:
-
nuclear factor κB
- OHC:
-
octahydrocurcumin
- OKT3:
-
mouse anti-human CD3 antibody
- PBMC:
-
peripheral blood mononuclear cells
- THC:
-
tetrahydrocurcumin
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Acknowledgements
We thank Annette Garbe for excellent technical assistance. This study was supported by the Deutsche Forschungsgemeinschaft grant SFB265 A7.
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This work was part of HK’s thesis at the Hannover Medical School.
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Deters, M., Knochenwefel, H., Lindhorst, D. et al. Different Curcuminoids Inhibit T-Lymphocyte Proliferation Independently of Their Radical Scavenging Activities. Pharm Res 25, 1822–1827 (2008). https://doi.org/10.1007/s11095-008-9579-2
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DOI: https://doi.org/10.1007/s11095-008-9579-2