The JAK/STAT3 signaling pathway mediates inhibition of host cell apoptosis by Chlamydia psittaci infection

Acute pancreatitis (AP), an inflammatory disorder of the pancreas, can cause systemic inflammatory responses. Escin Sodium (ES), a natural mixture of triterpene saponins extracted from the dry ripe fruit of Fructus Aesculi or horse chestnut crude, has been demonstrated to have antiedematous, anti-inflammatory, and antiexudative effects. We here aim to investigate the effects of ES pretreatment on AP in vivo and in vitro and explore its potential molecular mechanism. In the present study, we demonstrated that ES pretreatment could apparently decrease amylase and lipase, downregulate inflammatory cytokines, and attenuate pancreatic damage. Additionally, the increased expression of apoptotic-related proteins and the results of flow cytometry demonstrated the effects of ES on promoting apoptosis in acinar cells. Moreover, ES could enhance mitochondrial membrane potential (MMP, ΔΨm) and reactive oxygen species (ROS) level and reduce intracellular calcium concentration, which are closely related to mitochondrial-mediated death. The effect of ES pretreatment on acinar cell apoptosis was furtherly confirmed by the regulatory pathway of the ERK/STAT3 axis. These results suggest that ES attenuates the severity of AP by enhancing cell apoptosis via suppressing the ERK/STAT3 signaling pathway. These findings provide evidence for ES which is treated as a novel and potent therapeutic for the treatment of AP.

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IL-10 suppress vascular smooth muscle cell apoptosis via JAK2/STAT3 signaling pathway and its mechanism of action in atherosclerosis

Minerva Endocrinologica ◽

10.23736/s0391-1977.19.03060-8 ◽

2020 ◽

Vol 44 (4) ◽

Author(s):

Lei Ma ◽

Haibo Zheng ◽

Tao Zhang

Keyword(s):

Smooth Muscle ◽

Vascular Smooth Muscle ◽

Smooth Muscle Cell ◽

Signaling Pathway ◽

Muscle Cell ◽

Mechanism Of Action ◽

Cell Apoptosis ◽

Stat3 Signaling ◽

Stat3 Signaling Pathway ◽

Muscle Cell Apoptosis

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Effect and Mechanism of Interferon-Gamma Combined with Pembrolizumab on Chemoresistance of Lung Adenocarcinoma

Journal of Biomaterials and Tissue Engineering ◽

10.1166/jbt.2020.2231 ◽

2020 ◽

Vol 10 (1) ◽

pp. 105-109

Author(s):

Chunling Peng ◽

Chunqian Feng ◽

Sha Feng ◽

Daiqiang Li

Keyword(s):

Lung Cancer ◽

Cell Proliferation ◽

Western Blot ◽

Lung Adenocarcinoma ◽

Signaling Pathway ◽

Cell Apoptosis ◽

Drug Resistant ◽

Stat3 Signaling ◽

Stat3 Signaling Pathway ◽

Resistant Cells

Tumor microenvironment can lead to chemotherapy resistance in lung cancer. PD-1 and PD-L1 are core regulatory molecules of immune checkpoint. Our study intends to assess IFN-γ combined with Pembrolizumab’s effect on chemoresistance of lung adenocarcinoma. Human A549/DDP lung adenocarcinoma resistant strains were cultured in vitro and randomly divided into control group, IFN-γ group and Pembrolizumab+IFN-γ group followed by analysis of cell proliferation by MTT assay, cell apoptosis by flow cytometry, the levels of PD-L1 and Bcl-2 by Western Blot, the level of interleukin-10 (IL-10) and IL-17 by ELISA, as well as the expression of JAK/STAT3 signaling pathway by Western Blot. IFN-γ-treated A549/DDP cells showed significantly inhibited cell apoptosis, promoted cell proliferation, increased level of IL-10, IL-17, and elevated expression of PD-L1 and Bcl-2, as well as increased phosphorylation of JAK and STAT3 (P < 0.05). However, Pembrolizumab combined with IFN-γ treatment significantly inhibited cell proliferation, increased cell apoptosis, decreased IL-10 and IL-17 level, PD-L1 and Bcl-2 expression as well as JAK and STAT3 phosphorylation with significant difference compared to IFN-γ treatment alone (P < 0.05). IFN-γ up-regulates PD-L1 expression by up-regulating the JAK/STAT3 pathway, inhibits the apoptosis of drug-resistant cells in lung adenocarcinoma, and promotes cell proliferation. Pembrolizumab can reverse IFN-γ’s effect on drug-resistant cells of lung adenocarcinoma, down-regulate JAK/STAT3 signaling pathway and, promote the apoptosis of drug-resistant lung cancer cells, and inhibit cell proliferation.

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Curcumin attenuates inflammation and cell apoptosis through regulating NF-κB and JAK2/STAT3 signaling pathway against acute kidney injury

Cell Cycle ◽

10.1080/15384101.2020.1784599 ◽

2020 ◽

Vol 19 (15) ◽

pp. 1941-1951 ◽

Cited By ~ 2

Author(s):

Hongkun Zhu ◽

Xinjun Wang ◽

Xiaoxiao Wang ◽

Bei Liu ◽

Yizhen Yuan ◽

...

Keyword(s):

Acute Kidney Injury ◽

Signaling Pathway ◽

Cell Apoptosis ◽

Kidney Injury ◽

Stat3 Signaling ◽

Stat3 Signaling Pathway

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Salvianolic Acid B Protects Intervertebral Discs from Oxidative Stress-Induced Degeneration via Activation of the JAK2/STAT3 Signaling Pathway

Oxidative Medicine and Cellular Longevity ◽

10.1155/2021/6672978 ◽

2021 ◽

Vol 2021 ◽

pp. 1-13 ◽

Cited By ~ 1

Author(s):

Shouqian Dai ◽

Ting Liang ◽

Xiu Shi ◽

Zongping Luo ◽

Huilin Yang

Keyword(s):

Oxidative Stress ◽

Cell Proliferation ◽

Signaling Pathway ◽

Cell Apoptosis ◽

Caspase 3 ◽

Intervertebral Discs ◽

Salvianolic Acid B ◽

Stat3 Signaling ◽

Stat3 Signaling Pathway

Objective. To evaluate the influence of salvianolic acid B (SAB), an antioxidant derived from Danshen, on intervertebral disc degeneration (IDD) and its possible molecular mechanisms. Methods. Sixty adult rats were randomly grouped (control, IDD, and SAB IDD groups). IDD was induced using needle puncture. The rats received daily administration of SAB (20 mg/kg) in the SAB IDD group while the other two groups received only distilled water. The extent of IDD was evaluated using MRI after 3 and 6 weeks and histology after 6 weeks. Oxidative stress was assessed using the ELISA method. In in vitro experiments, nucleus pulposus cells (NPCs) were treated with H2O2 (100 μM) or SAB+H2O2, and levels of oxidative stress were measured. Cell apoptosis was assessed by flow cytometry, expression levels of Bcl-2, Bax, and cleaved caspase-3 proteins. Cell proliferation rate was assessed by EdU analysis. Pathway involvement was determined by Western blotting while the influence of the pathway on NPCs was explored using the pathway inhibitor AG490. Results. The data demonstrate that SAB attenuated injury-induced IDD and oxidative stress, caused by activation of the JAK2/STAT3 signaling pathway in vivo. Oxidative stress induced by H2O2 was reversed by SAB in vitro. SAB reduced the increased cell apoptosis, cleaved caspase-3 expression, and caspase-3 activity induced by H2O2. Reduced cell proliferation and decreased Bcl-2/Bax ratio induced by H2O2 were rescued by SAB. Additionally, the JAK2/STAT3 pathway was activated by SAB, while AG490 counteracted this effect. Conclusion. The results suggest that SAB protects intervertebral discs from oxidative stress-induced degeneration by enhancing proliferation and attenuating apoptosis via activation of the JAK2/STAT3 signaling pathway.

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The Hypothetical Inclusion Membrane Protein CPSIT_0846 Regulates Mitochondrial-Mediated Host Cell Apoptosis via the ERK/JNK Signaling Pathway

Frontiers in Cellular and Infection Microbiology ◽

10.3389/fcimb.2021.607422 ◽

2021 ◽

Vol 11 ◽

Author(s):

Ting Tang ◽

Haiying Wu ◽

Xi Chen ◽

Li Chen ◽

Luyao Liu ◽

...

Keyword(s):

Host Cell ◽

Signaling Pathway ◽

Hela Cells ◽

Cell Apoptosis ◽

B Cell Lymphoma ◽

Inclusion Membrane ◽

Jnk Signaling ◽

Amino Terminal ◽

Host Cell Apoptosis ◽

Jnk Signaling Pathway

Chlamydia psittaci is an important zoonotic factor associated with human and animal atypical pneumonia. Resisting host cell apoptosis is central to sustaining Chlamydia infection in vivo. Chlamydia can secrete inclusion membrane proteins (Incs) that play important roles in their development cycle and pathogenesis. CPSIT_0846 is an Inc protein in C. psittaci identified by our team in previous work. In the current study, we investigated the regulatory role of CPSIT_0846 in HeLa cell apoptosis, and explored potential mechanisms. The results showed that HeLa cells treated with CPSIT_0846 contained fewer apoptotic bodies and exhibited a lower apoptotic rate than untreated cells either with Hoechst 33258 fluorescence staining or flow cytometry with or without induction by staurosporine (STS). CPSIT_0846 could increase the phosphorylation of the extracellular signal-regulated kinases 1/2 (ERK1/2) or stress-activated protein kinases/c-Jun amino-terminal kinases (SAPK/JNK) signaling pathways, and the Bcl-2 associated X protein (Bax)/B cell lymphoma 2 (Bcl-2) ratio, levels of cleaved caspase-3/9 and cleaved Poly-ADP-ribose polymerase (PARP) were significantly up-regulated following inhibition of ERK1/2 or SAPK/JNK pathways with U0126 or SP600125. After carbonyl cyanide 3-chlorophenylhydrazone (CCCP) treatment, the mitochondrial membrane potential (MMP) of cells was significantly decreased in control group, but stable in the CPSIT_0846 treated one, and less cytochrome c (Cyt.c) was released into the cytoplasm. Inhibition of the ERK1/2 or SAPK/JNK pathway significantly decreased the JC-1 red-green fluorescence signal, and promoted Cyt.c discharge into the cytoplasm in HeLa cells treated with CPSIT_0846. In conclusion, CPSIT_0846 can regulate mitochondrial pathway-mediated apoptosis in HeLa cells by activating the ERK/JNK signaling pathway.

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