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https://www.readbyqxmd.com/read/29350244/autophagy-related-atg-11-atg9-and-the-phosphatidylinositol-3-kinase-control-atg2-mediated-formation-of-autophagosomes-in-arabidopsis
#1
Sangwoo Kang, Kwang Deok Shin, Jeong Hun Kim, Taijoon Chung
Using quantitative assays for autophagy, we analyzed 4 classes of atg mutants, discovered new atg2 phenotypes and ATG gene interactions, and proposed a model of autophagosome formation in plants. Plant and other eukaryotic cells use autophagy to target cytoplasmic constituents for degradation in the vacuole. Autophagy is regulated and executed by a conserved set of proteins called autophagy-related (ATG). In Arabidopsis, several groups of ATG proteins have been characterized using genetic approaches. However, the genetic interactions between ATG genes have not been established and the relationship between different ATG groups in plants remains unclear...
January 19, 2018: Plant Cell Reports
https://www.readbyqxmd.com/read/29349683/plantamajoside-inhibits-lipopolysaccharide-induced-muc5ac-expression-and-inflammation-through-suppressing-the-pi3k-akt-and-nf-%C3%AE%C2%BAb-signaling-pathways-in-human-airway-epithelial-cells
#2
Chaonan Ma, Wei Ma
It has been reported that plantamajoside (PMS), a major natural compound isolated from Plantago asiatica, has anti-inflammatory activities. However, the effect of PMS on respiratory inflammatory diseases has not yet been studied. The present study aimed to evaluate the effect of PMS on lipopolysaccharide (LPS)-induced airway inflammation and the underlying mechanism. The results showed that PMS did not affect the cell viability of 16-HBE cells. PMS (20 and 40 μg/ml) decreased the expression levels of MUC5AC, IL-6, and IL-1β, which were induced by LPS treatment...
January 18, 2018: Inflammation
https://www.readbyqxmd.com/read/29348875/radiosensitization-of-the-pi3k-inhibitor-hs-173-through-reduction-of-dna-damage-repair-in-pancreatic-cancer
#3
Jung Hee Park, Kyung Hee Jung, Soo Jung Kim, Zhenghuan Fang, Hong Hua Yan, Mi Kwon Son, Juyoung Kim, Yeo Wool Kang, Ji Eun Lee, Boreum Han, Joo Han Lim, Soon-Sun Hong
Activation of PI3K/AKT pathway occurs frequently in tumors and is correlated with radioresistance. The PI3K/AKT pathway can be an important target for improvement of radiotherapy. Although adding of chemotherapy to radiation therapy regimen enhances survival in patients with locally advanced pancreatic cancer, more effective therapies for increasing radiosensitivity are urgently needed. In this study, we investigated whether the novel PI3K inhibitor HS-173 could attenuate radiation-induced up-regulation of DNA damage repair processes and assessed its efficacy as a radio- and chemo-sensitizer...
December 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/29348577/targeting-b-cell-receptor-signalling-in-cancer-preclinical-and-clinical-advances
#4
REVIEW
Jan A Burger, Adrian Wiestner
B cell receptor (BCR) signalling is crucial for normal B cell development and adaptive immunity. BCR signalling also supports the survival and growth of malignant B cells in patients with B cell leukaemias or lymphomas. The mechanism of BCR pathway activation in these diseases includes continuous BCR stimulation by microbial antigens or autoantigens present in the tissue microenvironment, activating mutations within the BCR complex or downstream signalling components and ligand-independent tonic BCR signalling...
January 19, 2018: Nature Reviews. Cancer
https://www.readbyqxmd.com/read/29348486/phase-i-dose-escalation-study-of-copanlisib-in-combination-with-gemcitabine-or-cisplatin-plus-gemcitabine-in-patients-with-advanced-cancer
#5
R D Kim, S R Alberts, C Peña, I Genvresse, A Ajavon-Hartmann, C Xia, A Kelly, J E Grilley-Olson
BACKGROUND: Copanlisib is a pan-class I phosphatidylinositol 3-kinase (PI3K) inhibitor with predominant PI3K-α/δ activity that has demonstrated clinical activity and manageable safety when administered as monotherapy in a phase II study. Combination therapy may overcome compensatory signalling that could occur with PI3K pathway inhibition, resulting in enhanced inhibitory activity, and preclinical studies of copanlisib with gemcitabine have demonstrated potent anti-tumour activity in vivo...
January 18, 2018: British Journal of Cancer
https://www.readbyqxmd.com/read/29345855/increased-estradiol-in-hepatitis-e-virus-infected-pregnant-women-promote-viral-replication
#6
Chenchen Yang, Wenhai Yu, Yanhong Bi, Feiyan Long, Yunlong Li, Daqiao Wei, Xianhui Hao, Jianwen Situ, Yongqin Zhao, Fen Huang
Hepatitis E virus (HEV) infection causes subclinical diseases, leading to high mortality (> 25%) in pregnant women. HEV replication is aggressively escalated in pregnant women, especially in the third trimester of pregnancy. Estrogen plays an important role in pregnancy. However, the pathogenesis of HEV in pregnant women or immunosuppressive pregnant women (such as HIV-infected, or organ-transplanted pregnant women) remains unclear. We investigated the role of estradiol in HEV infection in a cell culture system...
January 18, 2018: Journal of Viral Hepatitis
https://www.readbyqxmd.com/read/29344640/over-regulation-of-microrna-133b-inhibits-cell-proliferation-of-cisplatin-induced-non-small-cell-lung-cancer-cells-through-pi3k-akt-and-jak2-stat3-signaling-pathway-by-targeting-egfr
#7
Bin Li, Cui-Min Ding, Yan-Xiao Li, Jing-Cui Peng, Nan Geng, Wen-Wen Qin
The present study determined the anticancer activity and its mechanism of microRNA‑133b on cell proliferation of cisplatin-induced non-small cell lung cancer cells. The expression of microRNA-133b cisplatin‑induced non-small cell lung cancer (NSCLC) tissue was lower than that of para-carcinoma tissue in patients. Overall survival of higher expression in cisplatin-induced NSCLC patients was higher than that of lower expression in cisplatin‑induced NSCLC patients. Over-regulation of microRNA-133b inhibited cell proliferation and LDH activity, induced apoptosis and caspase-3 activity, suppressed the protein expression of EGFR, PI3K, p-Akt, p-JAK2 and p-STAT3, decreased cyclin D1 and increased Bax protein expression in cisplatin‑induced A549 cells...
January 15, 2018: Oncology Reports
https://www.readbyqxmd.com/read/29344246/silibinin-inhibits-migration-and-invasion-of-the-rhabdoid-tumor-g401-cell-line-via-inactivation-of-the-pi3k-akt-signaling-pathway
#8
Yumei Li, Chunmei Zhang, Danfeng Cai, Congde Chen, Dongmei Mu
Rhabdoid tumors, which tend to occur prior to the age of 2 years, are one of the most aggressive malignancies and have a poor prognosis due to the frequency of metastasis. Silibinin, a natural extract, has been approved as a potential tumor suppressor in various studies, however, whether or not it also exerts its antitumor capacity in rhabdoid tumors, particularly with regards to tumor migration and invasion, is unclear. The rhabdoid tumor G401 cell line was used in the present in vitro study. An MTT assay was used to assess the cytotoxicity of silibinin on G401 cells, cell migration was studied using a wound healing assay and a Transwell migration assay, and cell invasion was determined using a Transwell invasion assay...
December 2017: Oncology Letters
https://www.readbyqxmd.com/read/29344198/combination-of-cecropinxj-and-ly294002-induces-synergistic-cytotoxicity-and-apoptosis-in-human-gastric-cancer-cells-via-inhibition-of-the-pi3k-akt-signaling-pathway
#9
Li-Jie Xia, Yan-Ling Wu, Fu-Chun Zhang
The aim of the present study was to investigate the cytotoxic and apoptotic effects of cecropinXJ against human gastric cancer BGC823 cells, either alone, or in combination with a specific phosphatidylinositol 3-kinase (PI3K) inhibitor, LY294002. Cell viability and the apoptosis rate were measured using flow cytometry with Annexin-V staining. Additionally, the expression levels of several RAC-α serine/threonine kinase (Akt) phosphorylation-associated proteins and apoptosis-regulating proteins were evaluated by western blot analysis...
December 2017: Oncology Letters
https://www.readbyqxmd.com/read/29344155/cd133-mediates-the-tgf-%C3%AE-1-induced-activation-of-the-pi3k-erk-p70s6k-signaling-pathway-in-gastric-cancer-cells
#10
Youlong Zhu, Feifei Kong, Caihua Zhang, Cheng Ma, Hong Xia, Bin Quan, Huaixin Cui
Cluster of differentiation (CD)133 has been reported to be involved in the activation of the extracellular signal-regulated kinase (ERK) signaling pathway in different types of cancer cells. CD133 has been reported to be involved in the activation of the ERK signaling pathway in various cancer cells. Transforming growth factor (TGF)-β1 has also been reported to mediate the activation of the ERK signaling pathway. In addition, TGF-β1 has been previously shown to mediate the activation of the ERK signaling pathway...
December 2017: Oncology Letters
https://www.readbyqxmd.com/read/29343273/inpp4b-promotes-cell-survival-via-sgk3-activation-in-npm1-mutated-leukemia
#11
Hongjun Jin, Liyuan Yang, Lu Wang, Zailin Yang, Qian Zhan, Yao Tao, Qin Zou, Yuting Tang, Jingrong Xian, Shuaishuai Zhang, Yipei Jing, Ling Zhang
BACKGROUND: Acute myeloid leukemia (AML) with mutated nucleophosmin (NPM1) has been recognized as a distinct leukemia entity in the 2016 World Health Organization (WHO) classification. The genetic events underlying oncogenesis in NPM1-mutated AML that is characterized by a normal karyotype remain unclear. Inositol polyphosphate 4-phosphatase type II (INPP4B), a new factor in the phosphoinositide-3 kinase (PI3K) pathway-associated cancers, has been recently found a clinically relevant role in AML...
January 17, 2018: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/29342461/mechanism-of-periostin-production-in-human-bronchial-smooth-muscle-cells
#12
Kosuke Makita, Yu Mikami, Hirotaka Matsuzaki, Naoya Miyashita, Hideyuki Takeshima, Satoshi Noguchi, Masafumi Horie, Hirokazu Urushiyama, Motoyasu Iikura, Masayuki Hojo, Takahide Nagase, Yasuhiro Yamauchi
BACKGROUND: Asthma is a chronic airway inflammatory disease characterized by airway remodeling, in which the bronchial smooth muscle (BSM) cells play an important role. Periostin, a biomarker that reflects Th2-driven inflammatory diseases such as asthma, may play an important role in the asthmatic airway. Although periostin is mainly produced in airway epithelial cells and fibroblasts after interleukin (IL)-13 stimulation, whether BSM cells produce periostin remains unclear. Therefore, we investigated periostin production in BSM cells and the mechanisms involved...
January 18, 2018: International Archives of Allergy and Immunology
https://www.readbyqxmd.com/read/29341802/portulaca-oleracea-l-extract-enhances-glucose-uptake-by-stimulating-glut4-translocation-to-the-plasma-membrane-in-3t3-l1-adipocytes
#13
Jae Eun Park, Ji Soo Lee, Hyun Ah Lee, Ji Sook Han
This study investigated the effects of Portulaca oleracea L. extract on glucose uptake in 3T3-L1 adipocytes. P. oleracea extract (POE) markedly enhanced glucose uptake, which was caused by increased GLUT4 expression at the plasma membrane (PM) in 3T3-L1 adipocytes. This increase in PM-GLUT4 expression was associated with insulin receptor substrate-1 (IRS-1) phosphorylation, phosphatidylinositol 3-kinase (PI3K) activation, and Akt phosphorylation, and finally, enhanced intracellular glucose uptake. POE was not associated with protein kinase C (PKC)λ/ζ phosphorylation in the insulin signaling pathway, but did promote 5'-AMP-activated kinase (AMPK) phosphorylation...
January 17, 2018: Journal of Medicinal Food
https://www.readbyqxmd.com/read/29341316/deferoxamine-promotes-mesenchymal-stem-cell-homing-in-noise-induced-injured-cochlea-through-pi3k-akt-pathway
#14
A A Peyvandi, H-A Abbaszadeh, N Ahmady Roozbahany, A Pourbakht, S Khoshsirat, H Haddadzade Niri, H Peyvandi, S Niknazar
OBJECTIVE: Over 5% of the world's population suffers from disabling hearing loss. Stem cell homing in target tissue is an important aspect of cell-based therapy, which its augmentation increases cell therapy efficiency. Deferoxamine (DFO) can induce the Akt activation, and phosphorylation status of AKT (p-AKT) upregulates CXC chemokine receptor-4 (CXCR4) expression. We examined whether DFO can enhance mesenchymal stem cells (MSCs) homing in noise-induced damaged cochlea by PI3K/AKT dependent mechanism...
January 17, 2018: Cell Proliferation
https://www.readbyqxmd.com/read/29340093/leucine-mediates-autophagosome-lysosome-fusion-and-improves-sperm-motility-by-activating-the-pi3k-akt-pathway
#15
Jin Zhang, Xuemei Zhang, Yingjie Liu, Zihao Su, Farman Ullah Dawar, Hong Dan, Yan He, Jian-Fang Gui, Jie Mei
Amino acid supplementation is an efficient and effective strategy to increase sperm quality. In our research, a comparative study was conducted to screen free amino acids to improve sperm motility, and we found that leucine was the most efficient one. Leucine treatment increases sperm motility depending on the activation of PI3K/Akt signaling pathway, while the chemical inhibitor of PI3K/Akt signal could reduce the amount of pAkt activated by leucine treatment. Moreover, leucine treatment improved the expression of P62 and LC3-II, substantially suppressed the autophagy process in zebrafish testis...
December 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/29339153/inhibition-of-cox-2-and-5-lox-regulates-the-progression-of-colorectal-cancer-by-promoting-pten-and-suppressing-pi3k-akt-pathway
#16
Jian Chang, Nan Tang, Qi Fang, Kongfan Zhu, Lei Liu, Xingcheng Xiong, Zhongchao Zhu, Bixiang Zhang, Mingzhi Zhang, Jing Tao
For colorectal cancer (CRC) patients, local and systemic inflammatory responses have been extensively reported to closely associate with patient survival. However, the specific signalling pathways responsible for carcinogenic responses are unclear. Phosphatase and tensin homolog deleted on chromosome 10 (PTEN) is a negative regulator of PI3K/AKT pathway that is gradually inactivated in cancers through mutation, loss of heterozygosity and others epigenetic mechanisms. In addition, COX and LOX metabolic pathways of arachidonic acid (AA) play a crucial role in promoting adenoma development...
January 12, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29339018/nicotine-alleviates-chronic-stress-induced-anxiety-and-depressive-like-behavior-and-hippocampal-neuropathology-via-regulating-autophagy-signaling
#17
Xi Xiao, Xueliang Shang, Baohui Zhai, Hui Zhang, Tao Zhang
Recently, we reported that chronic nicotine significantly improved chronic stress-induced impairments of cognition and the hippocampal synaptic plasticity in mice, however, the underlying mechanism still needs to be explored. In the present study, 32 male C57BL/6 mice were divided into four groups: control (CON), stress (CUS), stress with chronic nicotine administration (CUS + Nic) and chronic nicotine administration (Nic). The anxiety-like behavior and neuropathological alteration of DG neurons were examined...
January 12, 2018: Neurochemistry International
https://www.readbyqxmd.com/read/29337882/functional-analysis-of-promoters-from-three-subtypes-of-the-pi3k-family-and-their-roles-in-the-regulation-of-lipid-metabolism-by-insulin-in-yellow-catfish-pelteobagrus-fulvidraco
#18
Mei-Qin Zhuo, Zhi Luo, Yi-Huan Xu, Dan-Dan Li, Ya-Xiong Pan, Kun Wu
In the present study, the length of 360, 1848 and 367 bp sequences of promoters from three subtypes of PI3K family (PI3KCa, PI3KC2b and PI3KC3) of yellow catfish Pelteobagrus fulvidraco were cloned and characterized. Bioinformatics analysis revealed that PI3KCa, PI3KC2b and PI3KC3 had different structures in their core promoter regions. The promoter regions of PI3KCa and PI3KC2b had CpG islands but no CAAT and TATA box. In contrast, the promoter of PI3KC3 had the canonical TATA and CAAT box but no CpG island...
January 16, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29337110/muc16-c-terminal-induced-secretion-of-tumor-derived-il-6-contributes-to-tumor-associated-treg-enrichment-in-pancreatic-cancer
#19
Kun Fan, Chao Yang, Zhiyao Fan, Qiuyi Huang, Yiyin Zhang, He Cheng, Kaizhou Jin, Yu Lu, Zhengshi Wang, Guopei Luo, Xianjun Yu, Chen Liu
Pancreatic cancer is the most lethal tumor. CA125 (gene symbol MUC16) is an important serum marker for pancreatic cancer diagnosis and treatment. High serum CA125 is related to metabolic tumor burden and poor prognosis. The circulating Treg subset is another independent prognostic factor for pancreatic cancer. Our unpublished data indicated that the circulating Treg proportion might be related to the serum CA125 level. However, the potential relationship and underlying mechanism of MUC16 and Treg in pancreatic cancer tissues remain unclear...
January 11, 2018: Cancer Letters
https://www.readbyqxmd.com/read/29336620/the-role-of-the-pi3k-mtor-signaling-pathway-in-staphylococcus-epidermidis-small-colony-variants-intracellular-survival
#20
Agnieszka Magryś, Agnieszka Bogut, Michał Kiełbus, Alina Olender
The objective of this study was to analyze how Staphylococcus epidermidis SCV and WT strains manipulate the PI3K/Akt/mTOR signaling pathway. Six S. epidermidis strains with normal phenotype (WT) and six S. epidermidis strains with SCV phenotype were isolated in parallel from six patients with the prosthetic hip joint infections. THP-1 activated cells were incubated with or without PI3K inhibitor-wortmannin or with mTOR inhibitor-rapamycin. Next, macrophages were exposed to S. epidermidis WT and SCV strains...
January 16, 2018: Immunological Investigations
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