We are analyzing https://link.springer.com/article/10.1007/s10557-014-6539-4.

Title:
DPP-4 Inhibitors Repress NLRP3 Inflammasome and Interleukin-1beta via GLP-1 Receptor in Macrophages Through Protein Kinase C Pathway | Cardiovascular Drugs and Therapy
Description:
Background Anti-atherosclerotic effects of dipeptidyl peptidase-4 (DPP-4) inhibitors have been shown in many studies. Since inflammation and immune response play a key role in atherogenesis, we examined the effect of DPP-4 inhibitors on the expression of nod-like receptor family, pyrin domain containing 3 (NLRP3) Inflammasome and Interleukin-1beta (IL-1β) in human macrophages. Methods and Results THP-1 macrophages were incubated with oxidized low density lipoprotein (ox-LDL) with or without DPP-4 inhibitors (sitagliptin and NVPDPP728). The effects of DPP-4 inhibitors on the expression of NLRP3, toll-like receptor 4 (TLR4) and pro-inflammatory cytokine IL-1β were studied. Both DPP-4 inhibitors induced a significant reduction in NLRP3, TLR4 and IL-1β expression; concurrently, there was an increase in glucagon like peptide 1 receptor (GLP-1R) expression. Simultaneously, DPP-4 inhibitors reduced phosphorylated-PKC, but not PKA, levels. To determine the role of PKC activation in the effects of DPP-4 inhibitors, cells were treated with PMA- which blocked the effect of DPP-4 inhibitors on NLRP3 and IL-1β as well as TLR4 and GLP-1R. Over-expression of GLP-1R in macrophages with its agonist liraglutide also blocked the effects of PMA. Conclusion DPP-4 inhibitors suppress NLRP3, TLR4 and IL-1β in human macrophages through inhibition of PKC activity. This study provides novel insights into the mechanism of inhibition of inflammatory state and immune response in atherosclerosis by DPP-4 inhibitors.
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TLR4/PKC-mediated tight junction modulation: a clinical marker of chemotherapy-induced gut toxicity?

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         description:Anti-atherosclerotic effects of dipeptidyl peptidase-4 (DPP-4) inhibitors have been shown in many studies. Since inflammation and immune response play a key role in atherogenesis, we examined the effect of DPP-4 inhibitors on the expression of nod-like receptor family, pyrin domain containing 3 (NLRP3) Inflammasome and Interleukin-1beta (IL-1β) in human macrophages. THP-1 macrophages were incubated with oxidized low density lipoprotein (ox-LDL) with or without DPP-4 inhibitors (sitagliptin and NVPDPP728). The effects of DPP-4 inhibitors on the expression of NLRP3, toll-like receptor 4 (TLR4) and pro-inflammatory cytokine IL-1β were studied. Both DPP-4 inhibitors induced a significant reduction in NLRP3, TLR4 and IL-1β expression; concurrently, there was an increase in glucagon like peptide 1 receptor (GLP-1R) expression. Simultaneously, DPP-4 inhibitors reduced phosphorylated-PKC, but not PKA, levels. To determine the role of PKC activation in the effects of DPP-4 inhibitors, cells were treated with PMA- which blocked the effect of DPP-4 inhibitors on NLRP3 and IL-1β as well as TLR4 and GLP-1R. Over-expression of GLP-1R in macrophages with its agonist liraglutide also blocked the effects of PMA. DPP-4 inhibitors suppress NLRP3, TLR4 and IL-1β in human macrophages through inhibition of PKC activity. This study provides novel insights into the mechanism of inhibition of inflammatory state and immune response in atherosclerosis by DPP-4 inhibitors.
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      description:Anti-atherosclerotic effects of dipeptidyl peptidase-4 (DPP-4) inhibitors have been shown in many studies. Since inflammation and immune response play a key role in atherogenesis, we examined the effect of DPP-4 inhibitors on the expression of nod-like receptor family, pyrin domain containing 3 (NLRP3) Inflammasome and Interleukin-1beta (IL-1β) in human macrophages. THP-1 macrophages were incubated with oxidized low density lipoprotein (ox-LDL) with or without DPP-4 inhibitors (sitagliptin and NVPDPP728). The effects of DPP-4 inhibitors on the expression of NLRP3, toll-like receptor 4 (TLR4) and pro-inflammatory cytokine IL-1β were studied. Both DPP-4 inhibitors induced a significant reduction in NLRP3, TLR4 and IL-1β expression; concurrently, there was an increase in glucagon like peptide 1 receptor (GLP-1R) expression. Simultaneously, DPP-4 inhibitors reduced phosphorylated-PKC, but not PKA, levels. To determine the role of PKC activation in the effects of DPP-4 inhibitors, cells were treated with PMA- which blocked the effect of DPP-4 inhibitors on NLRP3 and IL-1β as well as TLR4 and GLP-1R. Over-expression of GLP-1R in macrophages with its agonist liraglutide also blocked the effects of PMA. DPP-4 inhibitors suppress NLRP3, TLR4 and IL-1β in human macrophages through inhibition of PKC activity. This study provides novel insights into the mechanism of inhibition of inflammatory state and immune response in atherosclerosis by DPP-4 inhibitors.
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