MEK

Stimulation response of p37d-expressing cells. (c) Western blot of 5 min serum stimulated HEK-293 cells stably expressing p37d, p110d or control, with the presence of inhibitors as indicated at the top.

Phosphorylation of PPARg in epididymal white adipose tissue in ob/ob mice after treatment with MEK inhibitors. Gene expression in ob/ob epididymal white adipose tissue after treatment with vehicle or either of two MEK inhibitors, PD0325901 or GSK1120212 (n = 7, 7 and 8, respectively). Areas under the curve and gene expression were analysed by analysis of variance.

ERK phosphorylates FBW7 at T205. PANC-1 cells were pretreated with the proteasome inhibitor MG132 and trametinib, as indicated, overnight before harvest. Endogenous FBW7 phosphorylation status was examined by immunoblot analysis after immunoprecipitates (IP).

Cells were stimulated with TPA (10 nM) for 15 min in the presence of the indicated concentrations of U0126. Samples were collected and analyzed by Western blot to detect phosphorylated p42/p44 MAPK.

 

Melanoma cell viability and in vivo growth by cyclindependent kinase 2/4 inhibition. Western blot analysis for c-Jun, phosphorylated-ERK1/2 (Thr202/Tyr204) (p-ERK1/2), and total ERK1/2 protein levels was done for human melanoma cell lines treated with the BRAFV600E inhibitor GDC-0879 (1 μM), or MEK inhibitors CI-1040 (1 μM), U0126 (1 μM), and PD98059 (10 μM) for 18 hours.

 

Activation of a TLR2eERK1/2 pathway in MDDC. (C) MDDC were either untreated or treated with C. pneumoniae alone or in the presence of the ERK1/2 inhibitor PD98059 for 48 h. IL-12p70 and IL-10 release in culture media was assessed by ELISA. (D) MDDC were treated as in panel C for 48 h and then cocultured with purified allogeneic CD3t T cells. On day 12, supernatants were collected, and secreted cytokines were measured by ELISA.

Expression of iNOS, Fra-1, Fra-2, JunB, JunD, and FosB in PMN. (A) PMN were treated with or without SB203580 (40 μM), BIX02189 (30 μM), or SP600125 (40 μM) for 1 h before addition of NDMA (0.74 μg/μl). The cytoplasmic and nuclear fractions obtained from the cells were used to detect iNOS, Fra-1, Fra-2, JunB, JunD, and FosB protein levels by Western blot. The results shown are representative of five independent experiments.

Western blot analysis showing HSP27 up-regulation on treatment of MKN-45 cells with the 2 indicated MEK1/2 kinase inhibitors (AS703026: 0.5 uM; PD98059: 10 uM) for the indicated time. Inset: effectiveness of the inhibitors in reducing Erk1/2 phosphorylation.

HBMEC were preincubated with the indicated concentrations of either ErB1/2/4 inhibitor (Pelitinib; EKB-569), and cells were then infected for 4 h with the unencapsulated strain, MC58 siaD. The numbers of adherent (black bars) and invasive (gray bars) bacteria were determined in a gentamicin protection assay. The graphs show the percentages of adhesion and invasion of inhibitor-treated cells, relative to control cells (means 盨D of three independent experiments performed in duplicate). *, P < 0.05.

Retrograde NGF increased BDNF expression in sensory neurons, which was mediated by the MEK/ERK pathway. In two-compartmented DRG-nerve culture, NGF (50 ng/mL) was added to the chamber containing the sensory axonal terminals. The expression of BDNF was examined in the DRG neuronal soma located in another chamber. After 12 h of NGF treatment, the level of BDNF was increased in the sensory neuronal cell bodies by 3 fold (compare B to A) when compared to control (E). The role of the MEK/ERK pathway in retrograde NGF-triggered BDNF up-regulation was determined by pre-treatment of the ganglia with inhibitors U0126 (C), PD98059 (D) or BIX02188 (E). All inhibitors significantly reduced NGF-evoked BDNF up-regulation in the ganglia when compared to vehicle treatment (F). Results were from 4 independent experiments for each treatment. Bar=80 μm. *, p＜0.05 vs all groups.

Effect of MEK inhibitor TAK-733 in A549 cells. A549 cells were incubated with increasing concentrations of TAK-733 for 2 h. The cell lysates were harvested and phosphorylation of indicated proteins was determined by Western blotting.

iKras p53L/+ cells were treated with AZD8330 (50 nM), BKM120 (150 nM), or Rapamycin (20 nM) for 18 hr. As control, cells were cultured in the presence or absence of doxycycline for 24 hr, and cell lysates were blotted for phospho-Akt, phospho-Erk, phospho-S6, and Myc.

Whole-cell lysates from NRAS- or BRAF-mutant melanoma cells treated with encorafenib or/and binimetinib or DMSO as a control for 24 hours were subjected to Western blot analysis to detect pERK, ERK, and b-actin. The experiment shown is a representative of three independent experiments.

After starved in serum-free medium for 24h, T47D cells incubated with the indicated concentrations of PD318088 for 3h,followed by 20-minute stimolation of 100ng/ml EGF.

(B) Cleaved PARP, Bax and Bcl2 protein expression was evaluated by immunoblotting of KRAS mutant cells lysates after 48 h of honokiol (10, 20, 40, and 60 μM) treatment. ∗∗P < 0.01 and ∗∗∗P < 0.001 for comparison between control group and honokiol-treated group.

RDEA119 (1 µM) or JTP-74057 (0.1 µM) abolished the effects of G1 on DAPK1 and NR2B phosphorylation.

Three types of selective inhibitors of MAPK signaling produce expected differential kinase inhibition and activation responses in HCT116 colorectal cancer cells. HCT116 cells were treated with 250 nM of GDC-0973, GDC-0623, SCH772984 or DMSO for 1, 4, or 24 h. In the washout samples, cells were drug treated for 24 h, then changed into fresh media and harvested after 0.5 or 2 h. Lysates were used for Western blots of total and phosphorylated MEK, ERK, and RSK; blotting for COX IV was used as the loading control.

Three types of selective inhibitors of MAPK signaling produce expected differential kinase inhibition and activation responses in HCT116 colorectal cancer cells. HCT116 cells were treated with 250nM of GDC-0973, GDC-0623, SCH772984 or DMSO for 1, 4, or 24 hours. In the washout samples, cells were drug treated for 24 hours, then changed into fresh media and harvested after 0.5 or 2 hours. Lysates were used for western blots of total and phosphorylated MEK, ERK and RSK; blotting for COX IV was used as the loading control.

Detection of the effects of letrozole and the MAPK pathway on the proliferation of GC-1 spg cells by BrdU. MAPK, mitogen-activated protein kinase; spg, spermatogonia; BrdU, bromodeoxyuridine

Stimulation response of p37d-expressing cells. (c) Western blot of 5 min serum stimulated HEK-293 cells stably expressing p37d, p110d or control, with the presence of inhibitors as indicated at the top.

Phosphorylation of PPARg in epididymal white adipose tissue in ob/ob mice after treatment with MEK inhibitors. Gene expression in ob/ob epididymal white adipose tissue after treatment with vehicle or either of two MEK inhibitors, PD0325901 or GSK1120212 (n = 7, 7 and 8, respectively). Areas under the curve and gene expression were analysed by analysis of variance.

ERK phosphorylates FBW7 at T205. PANC-1 cells were pretreated with the proteasome inhibitor MG132 and trametinib, as indicated, overnight before harvest. Endogenous FBW7 phosphorylation status was examined by immunoblot analysis after immunoprecipitates (IP).

Cells were stimulated with TPA (10 nM) for 15 min in the presence of the indicated concentrations of U0126. Samples were collected and analyzed by Western blot to detect phosphorylated p42/p44 MAPK.

 

Melanoma cell viability and in vivo growth by cyclindependent kinase 2/4 inhibition. Western blot analysis for c-Jun, phosphorylated-ERK1/2 (Thr202/Tyr204) (p-ERK1/2), and total ERK1/2 protein levels was done for human melanoma cell lines treated with the BRAFV600E inhibitor GDC-0879 (1 μM), or MEK inhibitors CI-1040 (1 μM), U0126 (1 μM), and PD98059 (10 μM) for 18 hours.

 

Activation of a TLR2eERK1/2 pathway in MDDC. (C) MDDC were either untreated or treated with C. pneumoniae alone or in the presence of the ERK1/2 inhibitor PD98059 for 48 h. IL-12p70 and IL-10 release in culture media was assessed by ELISA. (D) MDDC were treated as in panel C for 48 h and then cocultured with purified allogeneic CD3t T cells. On day 12, supernatants were collected, and secreted cytokines were measured by ELISA.

Expression of iNOS, Fra-1, Fra-2, JunB, JunD, and FosB in PMN. (A) PMN were treated with or without SB203580 (40 μM), BIX02189 (30 μM), or SP600125 (40 μM) for 1 h before addition of NDMA (0.74 μg/μl). The cytoplasmic and nuclear fractions obtained from the cells were used to detect iNOS, Fra-1, Fra-2, JunB, JunD, and FosB protein levels by Western blot. The results shown are representative of five independent experiments.

Western blot analysis showing HSP27 up-regulation on treatment of MKN-45 cells with the 2 indicated MEK1/2 kinase inhibitors (AS703026: 0.5 uM; PD98059: 10 uM) for the indicated time. Inset: effectiveness of the inhibitors in reducing Erk1/2 phosphorylation.

HBMEC were preincubated with the indicated concentrations of either ErB1/2/4 inhibitor (Pelitinib; EKB-569), and cells were then infected for 4 h with the unencapsulated strain, MC58 siaD. The numbers of adherent (black bars) and invasive (gray bars) bacteria were determined in a gentamicin protection assay. The graphs show the percentages of adhesion and invasion of inhibitor-treated cells, relative to control cells (means 盨D of three independent experiments performed in duplicate). *, P < 0.05.

Retrograde NGF increased BDNF expression in sensory neurons, which was mediated by the MEK/ERK pathway. In two-compartmented DRG-nerve culture, NGF (50 ng/mL) was added to the chamber containing the sensory axonal terminals. The expression of BDNF was examined in the DRG neuronal soma located in another chamber. After 12 h of NGF treatment, the level of BDNF was increased in the sensory neuronal cell bodies by 3 fold (compare B to A) when compared to control (E). The role of the MEK/ERK pathway in retrograde NGF-triggered BDNF up-regulation was determined by pre-treatment of the ganglia with inhibitors U0126 (C), PD98059 (D) or BIX02188 (E). All inhibitors significantly reduced NGF-evoked BDNF up-regulation in the ganglia when compared to vehicle treatment (F). Results were from 4 independent experiments for each treatment. Bar=80 μm. *, p＜0.05 vs all groups.

Effect of MEK inhibitor TAK-733 in A549 cells. A549 cells were incubated with increasing concentrations of TAK-733 for 2 h. The cell lysates were harvested and phosphorylation of indicated proteins was determined by Western blotting.

iKras p53L/+ cells were treated with AZD8330 (50 nM), BKM120 (150 nM), or Rapamycin (20 nM) for 18 hr. As control, cells were cultured in the presence or absence of doxycycline for 24 hr, and cell lysates were blotted for phospho-Akt, phospho-Erk, phospho-S6, and Myc.

Whole-cell lysates from NRAS- or BRAF-mutant melanoma cells treated with encorafenib or/and binimetinib or DMSO as a control for 24 hours were subjected to Western blot analysis to detect pERK, ERK, and b-actin. The experiment shown is a representative of three independent experiments.

After starved in serum-free medium for 24h, T47D cells incubated with the indicated concentrations of PD318088 for 3h,followed by 20-minute stimolation of 100ng/ml EGF.

(B) Cleaved PARP, Bax and Bcl2 protein expression was evaluated by immunoblotting of KRAS mutant cells lysates after 48 h of honokiol (10, 20, 40, and 60 μM) treatment. ∗∗P < 0.01 and ∗∗∗P < 0.001 for comparison between control group and honokiol-treated group.

RDEA119 (1 µM) or JTP-74057 (0.1 µM) abolished the effects of G1 on DAPK1 and NR2B phosphorylation.

Three types of selective inhibitors of MAPK signaling produce expected differential kinase inhibition and activation responses in HCT116 colorectal cancer cells. HCT116 cells were treated with 250 nM of GDC-0973, GDC-0623, SCH772984 or DMSO for 1, 4, or 24 h. In the washout samples, cells were drug treated for 24 h, then changed into fresh media and harvested after 0.5 or 2 h. Lysates were used for Western blots of total and phosphorylated MEK, ERK, and RSK; blotting for COX IV was used as the loading control.

Three types of selective inhibitors of MAPK signaling produce expected differential kinase inhibition and activation responses in HCT116 colorectal cancer cells. HCT116 cells were treated with 250nM of GDC-0973, GDC-0623, SCH772984 or DMSO for 1, 4, or 24 hours. In the washout samples, cells were drug treated for 24 hours, then changed into fresh media and harvested after 0.5 or 2 hours. Lysates were used for western blots of total and phosphorylated MEK, ERK and RSK; blotting for COX IV was used as the loading control.

Detection of the effects of letrozole and the MAPK pathway on the proliferation of GC-1 spg cells by BrdU. MAPK, mitogen-activated protein kinase; spg, spermatogonia; BrdU, bromodeoxyuridine