Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8336343 | The Journal of Nutritional Biochemistry | 2018 | 26 Pages |
Abstract
Persistent activation of the mechanistic target of rapamycin complex 1 (mTORC1) is linked to sustained inflammation and progression of colorectal cancer. Widely available dietary phenolics, curcumin and piperine are purported to have antiinflammatory and anticarcinogenic activities through yet-to-be-delineated multitarget mechanisms. Piperine is also known to increase the bioavailability of dietary components, including curcumin. The objective of the study was to determine whether curcumin and piperine have individual and combined effects in the setting of gut inflammation by regulating mTORC1 in human intestinal epithelial cells. Results show that curcumin repressed (a) mTORC1 activity (measured as changes in the phosphorylation state of p70 ribosomal protein S6 kinase B1 and 40S ribosomal protein S6) in a dose-dependent manner (2.5-20 μM, P<.007) and (b) synthesis of nascent proteins. Piperine inhibited mTORC1 activity albeit at comparatively higher concentrations than curcumin. The combination of curcumin + piperine further repressed mTORC1 signaling (P<.02). Mechanistically, curcumin may repress mTORC1 by preventing TSC2 degradation, the conserved inhibitor of mTORC1. Results also show that a functional mTORC1 was required for the transcription of TNFα as Raptor knockdown abrogated TNFα gene expression. Curcumin, piperine and their combination inhibited TNFα gene expression at baseline but failed to do so under conditions of mTORC1 hyperactivation. TNFâ-induced cyclooxygenase-2 expression was repressed by curcumin or curcumin + piperine at baseline and high mTORC1 levels. We conclude that curcumin and piperine, either alone or in combination, have the potential to down-regulate mTORC1 signaling in the intestinal epithelium with implications for tumorigenesis and inflammation.
Keywords
eEF2AKT serine/threonine kinase 1p70S6KEukaryotic elongation factor 2 kinaseRHEBRASBCACOX-2HRPeukaryotic translation initiation factor 4E binding protein 14EBP1DTTTSC1/2eEF2KPRAS40CYP3A4PiperineCURBRAFTNFαmTORC1PI3Kproline-rich Akt substrate 40IKKαDMSOERK1/2MAPKNFκBAktinflammationbicinchoninic acidtumor necrosis factor alphadithiothreitolDimethyl sulfoxideRas homolog enriched in brainRaptorTurmericColorectal cancercytochrome P450 3A4Cyclooxygenase-2eukaryotic translation elongation factor 2nuclear factor kappa Bphosphoinositide 3 kinasePepperPhenolicsmechanistic target of rapamycin complex 1Horseradish peroxidaseregulatory-associated protein of mTORmitogen activated protein kinasePiPCurcuminGlucuronidation
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Authors
Harleen Kaur, Bo He, Chenhua Zhang, Elliott Rodriguez, David S. Hage, Régis Moreau,