Tag Archives: Rabbit Polyclonal to M3K13.

LANSO inhibits LPS-induced TNF-α and IL-1β gene manifestation and protein production

LANSO inhibits LPS-induced TNF-α and IL-1β gene manifestation and protein production Although unstimulated THP-1 cells constitutively express mRNA for TNF-α and IL-1β production of TNF-α and IL-1β protein was not detected in tradition supernatant in which THP-1 cells were grown for 6 h by ELISA because of the sensitivity of the experimental system used in the present study. by 57% and protein production of TNF-α protein by 51%. LPS also inhibited manifestation buy 17388-39-5 of mRNA for Rabbit Polyclonal to M3K13. IL-1β by 62% and protein production of IL-1β by 71% (Fig. 1). LANSO inhibits HpWE-induced TNF-α and IL-1β gene manifestation and protein production HpWE increased manifestation of mRNA for TNF-α by 48-collapse after two-hr incubation with HpWE. Similar to TNF-α HpWE induced manifestation of mRNA for IL-1β by 200-collapse after two-hr incubation with HpWE. HpWE induced protein production of TNF-α and IL-1β after 3 h of incubation with HpWE. Pretreatment with 100 μM LANSO for 3 h decreased HpWE-induced manifestation of mRNA for TNF-α by 27% and protein production of TNF-α buy 17388-39-5 by 48%. LPS also inhibited manifestation of mRNA for IL-1β by 50% and protein production of IL-1β by 93% (Fig. 2). Inhibition of NF-κB and ERK decreases LPS-induced production of TNF-α in THP-1 cells To confirm the relevance of NF-κB and ERK to production of TNF-α by THP-1 cells stimulated by LPS we examined the effects of PDTC an inhibitor of NF-κB activation and PD 98059 a MEK inhibitor. Pretreatment with PDTC or PD98059 decreased the protein production of TNF-α by THP-1 cells stimulated by LPS (Fig. 3) by 54% and 34% respectively. These findings indicate that activation of NF-κB and ERK is responsible for production of TNF-α by THP-1 cells stimulated by LPS (Fig. 3). LANSO inhibits LPS-induced phosphorylation and degradation of IκB-α and phosphorylation of ERK Stimulation with LPS for one hr induced phosphorylation and degradation of IκB-α and phosphorylation of ERK. Pretreatment with LANSO for one hr inhibited LPS-induced phosphorylation and degradation of IκB-α buy 17388-39-5 and phosphorylation of ERK (Fig. 4). LANSO inhibits HpWE-induced phosphorylation and degradation of IκB-α and phosphorylation of ERK Similar to LPS stimulation with HpWE for one hr induced phosphorylation and degradation of IκB-α and phosphorylation of ERK. Pretreatment with LANSO for one hr inhibited HpWE-induced phosphorylation and degradation of IκB-α and phosphorylation of ERK (Fig. 5). Discussion In the present study we demonstrated that LANSO inhibits LPS and HpWE-induced transcription and production of TNF-α and IL-1β. We also showed that LANSO inhibited activation of NF-κB and ERK induced by LPS and HpWE which could account for why LANSO exerts anti-inflammatory effects. Production of proinflammatory cytokines such as TNF-α and IL-1β by inflammatory cells is one of the pivotal processes in gastrointestinal inflammation. In response to interaction with pathogenic bacteria inflammatory cells produce proinflammatory cytokines which activate further inflammatory processes and promote inflammation. In the present study we showed that LANSO inhibits production of buy 17388-39-5 TNF-α and IL-1β by the monocytic cell line THP-1 stimulated by LPS or HpWE. Moreover Nakamura et al. reported that uptake of LANSO was buy 17388-39-5 observed in inflammatory cells including polymorphonuclear cells and macrophages in the colonic mucosa of rats with dextran sodium sulfate-induced colitis [23]. These findings suggest that LANSO may exert anti-inflammatory effects in gastrointestinal inflammation via suppression of production of proinflammatory cytokines from inflammatory cells stimulated by pathogenic bacteria. Several reports have suggested mechanisms by which LANSO and other proton pump inhibitors exert anti-inflammatory effects [12-22]. In the present study we focused on the NF-κB and ERK signaling pathways since they are important transcription factors of critical importance for induction of production of proinflammatory cytokines by monocytes activated by LPS [24-26] or HpWE [27]. Our research proven that the suppression of TNF-α and IL-1β induced by LPS and HpWE was associated with inhibition of phosphorylation and degradation of IκB-α and phosphorylation of ERK. These results claim that the inhibitory aftereffect of LANSO on manifestation of TNF-α and IL-1β by THP-1 cells activated by LPS and HpWE was connected with inhibition from the NF-κB or ERK signaling pathway via inhibition of phosphorylation and degradation of IκB-α and phosphorylation of ERK. The complete mechanism.