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Cell Communication and Signaling: CCS

Henna Pehkonen, Mira Lento, Pernilla von Nandelstadh, Artemis Filippou, Reidar Grénman, Kaisa Lehti, Outi Monni
BACKGROUND: PPFIA1 is located at the 11q13 region commonly amplified in cancer. The protein liprin-α1 encoded by PPF1A1 contributes to the adhesive and invasive structures of cytoskeletal elements and is located at the invadosomes in cancer cells. However, the precise mechanism of liprin-α1 function in cancer progression has remained elusive. METHODS: Invasion regulating activity of liprin-α1 was examined by analyzing the functions of squamous cell carcinoma of head and neck (HNSCC) cell lines in three-dimensional collagen I after RNAi mediated gene knockdown...
July 13, 2018: Cell Communication and Signaling: CCS
Taishu Wang, Jinrui Zhang, Shanshan Wang, Xiuna Sun, Duchuang Wang, Yurou Gao, Yang Zhang, Lu Xu, Yue Wu, Yueguang Wu, Fang Liu, Xiuxiu Liu, Shuyan Liu, Yingqiu Zhang, Yang Wang, Lijuan Zou, Han Liu
BACKGROUND: The epidermal growth factor receptor (EGFR) is closely implicated in cancer, and sequencing analyses have revealed a high mutation rate of EGFR in lung cancer. Recent advances have provided novel insights into the endocytic regulation of wild-type EGFR, but that of mutated EGFR remains elusive. In the present study, we aim to investigate the endocytic degradation of a frequently occurred exon 19-deleted mutant in lung cancer. METHODS: The EGF-induced endocytic degradation of EGFR was examined in a panel of lung cancer cells using immunoblotting...
July 5, 2018: Cell Communication and Signaling: CCS
François Fabi, Pascal Adam, Keven Vincent, Françis Demontigny, Sophie Parent, France-Hélène Joncas, Eric Asselin
BACKGROUND: CRM1 enrichment has been shown to be indicative of invasive as well as chemoresistant tumors. On the other hand, TRAIL, a powerful and specific anti-tumoral agent, has yet to be used effectively to treat gynecological tumors in patients. In the present study, we examined if CRM1, a nuclear exporter capable of mediating protein transport, could be a relevant target to restore chemosensitivity in chemoresistant cells. We thus explored the hypothesis that CRM1-driven nuclear exclusion of tumor suppressors could lead to chemoresistance and that CRM1 inhibitors could present a novel therapeutic approach, allowing sensitization to chemotherapeutic agents...
July 4, 2018: Cell Communication and Signaling: CCS
Jiaxin Kang, Jian Wang, Zhuang Yao, Yuanzhao Hu, Shijie Ma, Qin Fan, Feng Gao, Yan Sun, Jianwei Sun
BACKGROUND: Fascin is a F-actin bundling protein and its overexpression is correlated with poor prognosis and increases metastatic potential in a number of cancers. But underlying function and mechanism of fascin on tumorigenesis in melanoma remain elusive. METHODS: The melanoma cell lines WM793 and WM39 were employed for the soft agar and sphere formation assay. Quantitative RT-PCR and Western blot were performed for identifying the gene expression at mRNA and protein levels, respectively...
July 3, 2018: Cell Communication and Signaling: CCS
Zhongyuan Cao, Xinfeng Suo, Yudan Chu, Zhou Xu, Yun Bao, Chunxiao Miao, Wenfeng Deng, Kaijun Mao, Juan Gao, Zhen Xu, Yan-Qing Ma
BACKGROUND: Integrins are essential regulators of angiogenesis. However, the antiangiogenic potential of peptides derived from the integrin cytoplasmic tails (CT) remains mostly undetermined. METHODS: Here we designed a panel of membrane-penetrating peptides (termed as mβCTPs), each comprising a C-terminal NxxY motif from one of the conserved integrin β CTs, and evaluated their antiangiogenic ability using both in vitro and in vivo approaches. RESULTS: We found that mβ3CTP, mβ5CTP and mβ6CTP, derived respectively from the integrin β3, β5 and β6 CTs, but not others, exhibit antiangiogenic ability...
July 3, 2018: Cell Communication and Signaling: CCS
P Olof Olsson, Renata Gustafsson, Alexei V Salnikov, Maria Göthe, Kathrin S Zeller, Tomas Friman, Bo Baldetorp, Louise A Koopman, Paul H Weinreb, Shelia M Violette, Sebastian Kalamajski, Nils-Erik Heldin, Kristofer Rubin
BACKGROUND: Chemotherapeutic efficacy can be improved by targeting the structure and function of the extracellular matrix (ECM) in the carcinomal stroma. This can be accomplished by e.g. inhibiting TGF-β1 and -β3 or treating with Imatinib, which results in scarcer collagen fibril structure in xenografted human KAT-4/HT29 (KAT-4) colon adenocarcinoma. METHODS: The potential role of αV β6 integrin-mediated activation of latent TGF-β was studied in cultured KAT-4 and Capan-2 human ductal pancreatic carcinoma cells as well as in xenograft carcinoma generated by these cells...
July 2, 2018: Cell Communication and Signaling: CCS
Linghuo Jiang, Junjun Wang, Faiza Asghar, Nathan Snyder, Kyle W Cunningham
BACKGROUND: Saccharomyces cerevisiae ScGdt1 and mammalian TMEM165 are two members of the UPF0016 membrane protein family that is likely to form a new group of Ca2+ /H+ antiporter and/or a Mn2+ transporter in the Golgi apparatus. We have previously shown that Candida albicans CaGDT1 is a functional ortholog of ScGDT1 in the response of S. cerevisiae to calcium stress. However, how CaGdt1 together with the Golgi calcium pump CaPmr1 regulate calcium homeostasis and cell wall integrity in this fungal pathogen remains unknown...
June 28, 2018: Cell Communication and Signaling: CCS
Kausar M Ansari, Praveen R Arany, Eli Arama, Sarit Larisch, Raymond B Birge, Dhyan Chandra
The International Conference on Cell Death in Cancer and Toxicology 2018 (February 20-22, 2018) provided an international forum for scientific collaborations across multiple disciplines in cancer, cell death, and toxicology. During the three-day symposium, researchers and clinicians shared recent advances in basic, clinical, and translational research in cancer. Several student poster abstracts were selected for platform talks and many young investigators participated in the meeting. Together, this highly interactive meeting showcased the rapid expansion in biomedical research in India and paved the way for future meetings on cell death and cancer throughout India...
June 28, 2018: Cell Communication and Signaling: CCS
Ines Breuksch, Jonas Welter, Heide-Katharina Bauer, Thorsten Enklaar, Sebastian Frees, Joachim W Thüroff, Annette Hasenburg, Dirk Prawitt, Walburgis Brenner
BACKGROUND: Loss of PTEN is involved in tumor progression of several tumor entities including renal cell carcinoma (RCC). During the translation process PTEN generates a number of splice variants, including PTEN-Δ. We analyzed the impact of PTEN-Δ in RCC progression. METHODS: In specimens of RCC patients the expression of PTEN-Δ and PTEN was quantified. The PTEN expressing RCC cell line A498 and the PTEN deficient 786-O cell line were stably transfected with the PTEN-Δ or PTEN transcript...
June 28, 2018: Cell Communication and Signaling: CCS
Dejuan Yang, Yunhai Li, Lei Xing, Yiqing Tan, Jiazheng Sun, Beilei Zeng, Tingxiu Xiang, Jinxiang Tan, Guosheng Ren, Yuanyuan Wang
BACKGROUND: To determine whether adipocyte-derived lipids could be transferred into breast cancer cells and investigate the underlying mechanisms of subsequent lipolysis and fatty acid trafficking in breast cancer cells. METHODS: A Transwell co-culture system was used in which human breast cancer cells were cultured in the absence or presence of differentiated murine 3 T3-L1 adipocytes. Migration/invasion and proliferation abilities were compared between breast cancer cells that were cultivated alone and those co-cultivated with mature adipocytes...
June 18, 2018: Cell Communication and Signaling: CCS
Min Yang, En Liu, Li Tang, Yuanyuan Lei, Xuemei Sun, Jiaxi Hu, Hui Dong, Shi-Ming Yang, Mingfa Gao, Bo Tang
The MiT/TFE transcription factors play a pivotal role in the regulation of autophagy and lysosomal biogenesis. The subcellular localization and activity of MiT/TFE proteins are primarily regulated through phosphorylation. And the phosphorylated protein is retained in the cytoplasm and subsequently translocates to the nucleus upon dephosphorylation, where it stimulates the expression of hundreds of genes, leading to lysosomal biogenesis and autophagy induction. The transcription factor-mediated lysosome-to-nucleus signaling can be directly controlled by several signaling molecules involved in the mTORC1, PKC, and AKT pathways...
June 15, 2018: Cell Communication and Signaling: CCS
Wenjin Liang, Yong Liao, Zeming Li, Yan Wang, Siqi Zheng, Xiaochen Xu, Fulin Ran, Bo Tang, Zhenran Wang
In this study, we investigated the role of microRNA-644a (miR-644a) in the growth and survival of hepatocellular carcinoma (HCC) cells. MiR-644a levels were lower in HCC tissues than in adjacent peri-cancerous tissues (n = 135). MiR-644a expression was inversely correlated with heat shock factor 1 (HSF1) expression, tumour diameter and TNM stage. Moreover, HepG2 and SMMC-7721 cell lines showed lower miR-644a expression than normal L-O2 hepatocytes. MiR-644a overexpression in HepG2 and SMMC-7721 cells increased apoptosis by downregulating HSF1...
June 14, 2018: Cell Communication and Signaling: CCS
Shuai Li, Lanyan Fu, Tian Tian, Liwen Deng, Huangbin Li, Weixiong Xia, Qing Gong
BACKGROUND: SOD1 is an abundant enzyme that has been studied as a regulator of the antioxidant defence system, and this enzyme is well known for catalyzing the dismutation of superoxide into hydrogen peroxide. However the SOD1 in the progress of NPC and underlying mechanisms remain unclear. METHODS: In NPC tissue samples, SOD1 protein levels were measured by Western blot and immunohistochemical (IHC) staining. mRNA levels and SOD1 activity were monitored by qRT-PCR and SOD activity kit, respectively...
June 11, 2018: Cell Communication and Signaling: CCS
Sungjin Park, Hyunji Lee, Minhee Kim, Jisoo Park, Seon-Hwan Kim, Jongsun Park
TRIO and F-actin-binding protein (TRIOBP) also referred to as Tara, was originally isolated as a cytoskeleton remodeling protein. TRIOBP-1 is important for regulating F-actin filament reorganization. TRIOBP variants are broadly classified as variant-1 or - 4 and do not share exons. TRIOBP variant-5 contains all exons. Earlier studies indicated that TRIOBP-4/5 mutation is a pivotal element of autosomal recessive nonsyndromic hearing loss. However, recent studies provide clues that TRIOBP variants are associated with other human diseases including cancer and brain diseases...
June 11, 2018: Cell Communication and Signaling: CCS
Taylor C Brown, Timothy D Murtha, Jill C Rubinstein, Reju Korah, Tobias Carling
BACKGROUND: Altered expression of Solute Carrier Family 12 Member 7 (SLC12A7) is implicated to promote malignant behavior in multiple cancer types through an incompletely understood mechanism. Recent studies have shown recurrent gene amplifications and overexpression of SLC12A7 in adrenocortical carcinoma (ACC). The potential mechanistic effect(s) of SLC12A7 amplifications in portending an aggressive behavior in ACC has not been previously studied and is investigated here using two established ACC cell lines, SW-13 and NCI-H295R...
June 8, 2018: Cell Communication and Signaling: CCS
Qingguo Li, Yaqi Li, Lei Liang, Jing Li, Dakui Luo, Qi Liu, Sanjun Cai, Xinxiang Li
BACKGROUND: Klotho (KL) was originally characterized as an aging suppressor gene, and has been identified as a tumor suppressor gene in a variety of cancers, including colorectal cancer. Recent years have witnessed the importance of metabolism transformation in cancer cell malignancies maintenance. Aberrant cancer cell metabolism is considered to be the hallmark of cancer. Our previous studies demonstrated that KL played negative roles in colon cancer cell proliferation and metastasis...
June 8, 2018: Cell Communication and Signaling: CCS
Jiangfeng Du, Yaping Qin, Yahong Wu, Wenshan Zhao, Wenjie Zhai, Yuanming Qi, Chuchu Wang, Yanfeng Gao
BACKGROUND: Programmed cell death protein 1 (PD-1), a negative co-stimulatory molecule, plays crucial roles in immune escape. Blockade of the interaction between PD-1 and PD-L1 shows exciting clinical responses in a fraction of cancer patients and the success makes PD-1 as a valuable target in immune checkpoint therapy. For the rational design of PD-1 targeting modulators, the ligand binding mechanism of PD-1 should be well understood in prior. METHODS: In this study, we applied 50 ns molecular dynamics simulations to observe the structural properties of PD-1 molecule in both apo and ligand bound states, and we studied the structural features of PD-1 in human and mouse respectively...
June 7, 2018: Cell Communication and Signaling: CCS
Omar Elaskalani, Norbaini Binti Abdol Razak, Pat Metharom
BACKGROUND: The release of neutrophil extracellular traps (NETs), a mesh of DNA, histones and neutrophil proteases from neutrophils, was first demonstrated as a host defence against pathogens. Recently it became clear that NETs are also released in pathological conditions. NETs released in the blood can activate thrombosis and initiate a cascade of platelet responses. However, it is not well understood if these responses are mediated through direct or indirect interactions. We investigated whether cell-free NETs can induce aggregation of washed human platelets in vitro and the contribution of NET-derived extracellular DNA and histones to platelet activation response...
May 29, 2018: Cell Communication and Signaling: CCS
Shaojie Jiang, Miaofeng Zhang, Jihong Sun, Xiaoming Yang
Casein kinase 1α (CK1α) is a multifunctional protein belonging to the CK1 protein family that is conserved in eukaryotes from yeast to humans. It regulates signaling pathways related to membrane trafficking, cell cycle progression, chromosome segregation, apoptosis, autophagy, cell metabolism, and differentiation in development, circadian rhythm, and the immune response as well as neurodegeneration and cancer. Given its involvement in diverse cellular, physiological, and pathological processes, CK1α is a promising therapeutic target...
May 24, 2018: Cell Communication and Signaling: CCS
Jingwen Wang, Yuhong Huang, Jun Zhang, Boyi Xing, Wei Xuan, Honghai Wang, He Huang, Jiayu Yang, Jianwu Tang
BACKGROUND: SDF1/CXCR4 and AnnexinA7 play important roles in many physiological and pathological conditions, but the molecular association between them in cancer cells has not been studied thus far. METHODS: The expression changes of SDF1/CXCR4 were detected by gene transcriptome sequencing, qRT-PCR, Western blotting, cytoimmunofluorescence and immunohistochemistry in mouse hepatocarcinoma F/P cells, AnnexinA7 downregulated expression F (FA7DOWN ) cells, AnnexinA7 overexpression P (PA7UP ) cells, AnnexinA7 unrelated sequence F (FSHUS ) cells, empty vector P (PNCEV ) cells and normal liver cells in vitro and in vivo...
May 21, 2018: Cell Communication and Signaling: CCS
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