Abstract
We have recently isolated and characterized the chemical structure of a bioactive Maillard reaction product, [5-(5,6-dihydro-4H-pyridin-3-ylidenemethyl)furan-2-yl]-methanol (F3-A), from an aqueous glucose (Glc) and lysine (Lys) Maillard reaction (MR) model system. Here, we investigate further the mechanisms for anti-inflammatory effects of this product in Caco-2 and RAW 264.7 cells. The anti-inflammatory capacity of F3-A recovered from Glc–Lys MR mixture and a synthesized product were compared with those of the specific inducible nitric oxide synthase (iNOS) inhibitor, aminoguanidine (AG), and the nuclear factor-kappa B (NF-κB) inhibitor, pyrrolidine dithiocarbamate (PDTC). F3-A produced a dose-dependent inhibition of extracellular nitric oxide (NO) production and iNOS translation in Caco-2 cells induced with interferon gamma (IFN-γ) and phorbol 12-myristate 13-acetate (PMA), and these effects were more potent than those obtained with AG. Moreover, a combination of F3-A and AG to attenuate intestinal inflammation was additive. However, F3-A inhibited only intracellular NO production in RAW 264.7 cells and did not inhibit COX-2 or NF-κB in either cell line. We conclude that the anti-inflammatory properties of F3-A are cell specific, working through different mechanism between macrophages and intestinal cells.
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Abbreviations
- AG:
-
Aminoguanidine
- COX-2:
-
Cyclooxygenase-2
- DAF-2:
-
4,5-Diaminofluorescein
- DAF-2DA:
-
4,5-Diaminofluorescein diacetate
- DAF-2T:
-
Triazolofluorescein
- DCM:
-
Dichloromethane
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- FBS:
-
Fetal bovine serum
- F3-A:
-
[5-(5,6-Dihydro-4H-pyridin-3-ylidenemethyl)furan-2-yl]-methanol
- F3-AC19:
-
Isolated F3-A purified by flash chromatography
- F3-AS:
-
Synthesized F3-A
- Glc:
-
Glucose
- HMF:
-
Hydroxymethylfurfural
- HMFA:
-
5-Hydroxymethyl-2-furoic acid
- IBD:
-
Inflammatory bowel disease
- IECs:
-
Intestinal epithelial cells
- IFN-γ:
-
Interferon gamma
- IL-6:
-
Interleukin-6
- IL-8:
-
Interleukin 8
- iNOS:
-
Inducible nitric oxide synthase
- LPS:
-
Lipopolysaccharide
- Lys:
-
Lysine
- 3-MCP:
-
3-Methyl-1,2-cyclopentanedione
- MEM:
-
Minimum essential medium
- MR:
-
Maillard reaction
- MRPs:
-
Maillard reaction products
- MTT:
-
3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- NF-κB:
-
Nuclear factor-kappa B
- NMR:
-
Nuclear magnetic resonance
- NO:
-
Nitric oxide
- NO2 − :
-
Nitrite
- NO3 − :
-
Nitrate
- NOD:
-
Nitric oxide dioxygenase
- PDTC:
-
Pyrrolidine dithiocarbamate
- PMA:
-
Phorbol 12-myristate 13-acetate
- Rf:
-
Retention factor
- RT-PCR:
-
Reverse transcription polymerase chain reaction
- TLC:
-
Thin layer chromatography
- TBST:
-
Tris-buffered saline-Tween
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Acknowledgments
This study was supported by a NSERC-discovery grant to DDK. We also thank Yongting Chen for help with protein and mRNA extraction.
Compliance with Ethical Standards
This article does not contain any studies with human participants or animals performed by any of the authors.
Conflict of interest
The authors declare no conflict of interest.
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Chen, XM., Kitts, D.D. Evidence for inhibition of nitric oxide and inducible nitric oxide synthase in Caco-2 and RAW 264.7 cells by a Maillard reaction product [5-(5,6-dihydro-4H-pyridin-3-ylidenemethyl)furan-2-yl]-methanol. Mol Cell Biochem 406, 205–215 (2015). https://doi.org/10.1007/s11010-015-2438-7
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DOI: https://doi.org/10.1007/s11010-015-2438-7