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hypoxia tumor

Ana María García Vicente, María José Rodriguez Muñoz, Francisco José Pena Pardo, Milton Miguel Martinez Madrigal, Angel Soriano Castrejón
Ischemic complications after resection of high-grade glioma are frequent and may constitute potential cause of false-positive results in postsurgical evaluation using F-fluorocholine PET/CT. On the other hand, hypoxia caused by ischemia promotes invasive glioma growth. We present 3 cases of patients with different grades of ischemic injury after resection of high-grade glioma. The combined interpretation of diffusion-weighted imaging and apparent diffusion coefficient map on MRI, in this clinical setting, is mandatory to avoid PET/CT misinterpretations...
December 3, 2018: Clinical Nuclear Medicine
A Archvadze, A Kistauri, N Gongadze, T Makharadze, K Chirakadze
Nowadays, chronic diseases are leading cause of death worldwide. One of popular chronic disease of 21 century is Diabetes Mellitus (DM) that affected 422 million people around the world in 2014; its prevalence is expected to increase to 592 million by the year 2035. Diabetic neuropathy (DN) seems to be the most common and least understood complication being present in over 50% of chronic diabetics. As the latest date explain the pathogenesis of DN is not fully understood. Therefore, considering the widespread of DN, severity of its consequences, it is vital to investigate details of its pathophysiology and find therapeutic strategies to improve patients' condition...
October 2018: Georgian Medical News
Ali Mahdi, Behrad Darvishi, Keivan Majidzadeh-A, Malihe Salehi, Leila Farahmand
It is now fully recognized that along with multiple physiological functions, angiogenesis is also involved in the fundamental process and pathobiology of several disorders including cancer. Recent studies have fully established the role of angiogenesis in cancer progression as well as invasion and metastasis. Consequently, many therapeutic agents such as monoclonal antibodies targeting angiogenesis pathway have been introduced in clinic with the hope for improving the outcomes of cancer therapy. Bevacizumab (Avastin®) was the first anti-vascular endothelial growth factor (VEGF) targeting monoclonal antibody developed with this purpose and soon received its accelerated US Food and Drug Administration (FDA) approval for treatment of patients with metastatic breast cancer in 2008...
December 4, 2018: Journal of Cellular Physiology
Viswanath Gunda, Benjamin Gigliotti, Tameem Ashry, Dorothy Ndishabandi, Michael McCarthy, Zhiheng Zhou, Salma Amin, Kyu Eun Lee, Tabea Stork, Lori Wirth, Gordon J Freeman, Alessandro Alessandrini, Sareh Parangi
Patients with anaplastic thyroid cancer (ATC) have an extremely poor prognosis despite multimodal therapy with surgery and chemoradiation. Lenvatinib, a multi-targeted tyrosine kinase inhibitor, and checkpoint inhibitors targeting the programmed cell death pathway have proven effective in some patients with advanced thyroid cancer. Combination of these therapies is a potential means to boost effectiveness and minimize treatment resistance in ATC. We utilized our novel immunocompetent murine model of orthotopic ATC to demonstrate that lenvatinib led to significant tumor shrinkage and increased survival, while combination therapy led to dramatic improvements in both...
December 4, 2018: International Journal of Cancer. Journal International du Cancer
Neha Kaushik, Seungmo Kim, Yongjoon Suh, Su-Jae Lee
Cancer is a systemic disease in which neoplastic cells interact with multiple types of non-neoplastic stromal cells as well as non-cellular components. The extracellular matrix (ECM) is a non-cellular component that is aberrantly regulated in many types of tumor microenvironments. Since the ECM generally maintains the tissue structure and provides mechanical forces in the tumor microenvironment, it has been simply assumed to act as a physical barrier for cancer metastasis and have a passive role in cancer progression...
December 4, 2018: Archives of Pharmacal Research
Sabra I Djomehri, Boris Burman, Maria E Gonzalez, Shuichi Takayama, Celina G Kleer
While 3D cellular models are useful to study biological processes, gel-embedded organoids have large variability. This paper describes high-yield production of large (~1 mm diameter), scaffold-free, highly-spherical organoids in a one drop-one organoid format using MCF10A cells, a non-tumorigenic breast cell line. These organoids display a hollow lumen and secondary acini, and express mammary gland-specific and progenitor markers, resembling normal human breast acini. When subjected to treatment with TGF-β, the hypoxia-mimetic reagent CoCl2 , or co-culture with mesenchymal stem/stromal cells (MSC), the organoids increase collagen I production and undergo large phenotypic and morphological changes of neoplastic progression, which were reproducible and quantifiable...
December 4, 2018: Journal of Cell Communication and Signaling
Swetlana Rot, Helge Taubert, Matthias Bache, Thomas Greither, Peter Würl, Hans-Jürgen Holzhausen, Alexander W Eckert, Dirk Vordermark, Matthias Kappler
In various tumors, the hypoxia inducible factor-1α ( HIF-1α ) and the epidermal growth factor-receptor ( EGFR ) have an impact on survival. Nevertheless, the prognostic impact of both markers for soft tissue sarcoma (STS) is not well studied. We examined 114 frozen tumor samples from adult soft tissue sarcoma patients and 19 frozen normal tissue samples. The mRNA levels of HIF-1α, EGFR, and the reference gene hypoxanthine phosphoribosyltransferase (HPRT) were quantified using a multiplex qPCR technique. In addition, levels of EGFR or HIF-1α protein were determined from 74 corresponding protein samples using ELISA techniques...
December 3, 2018: International Journal of Molecular Sciences
Rohan Garje, Josiah J An, Kevin Sanchez, Austin Greco, Jeffrey Stolwijk, Eric Devor, Youcef Rustum, Yousef Zakharia
In the last two decades, the discovery of various pathways involved in renal cell carcinoma (RCC) has led to the development of biologically-driven targeted therapies. Hypoxia-inducible factors (HIFs), angiogenic growth factors, von Hippel⁻Lindau ( VHL ) gene mutations, and oncogenic microRNAs (miRNAs) play essential roles in the pathogenesis and drug resistance of clear cell renal cell carcinoma. These insights have led to the development of vascular endothelial growth factor (VEGF) inhibitors, Mechanistic target of rapamycin (mTOR) inhibitors, and immunotherapeutic agents, which have significantly improved the outcomes of patients with advanced RCC...
December 1, 2018: International Journal of Molecular Sciences
Tuanwei Li, Lifeng Yan
Photodynamic therapy (PDT) is an appealing therapeutic modality in management of some solid tumors and other diseases for its minimal invasion and non-systemic toxicity. However, the hydrophobicity and non-selectivity of the photosensitizers, inherent serious hypoxia of tumor tissues and limited penetration depth of light restrict PDT further applications in clinic. Functional polymer nanoparticles can be used as a nanocarrier for accurate PDT. Here, we elucidate the mechanism and application of PDT in cancer treatments, and then review some strategies to administer the biodistribution and activation of photosensitizers (PSs) to ameliorate or utilize the tumor hypoxic microenvironment to enhance the photodynamic therapy effect...
November 30, 2018: Pharmaceuticals
Zengzhen Chen, Meng Niu, Gen Chen, Qiong Wu, Longfei Tan, Changhui Fu, Xiangling Ren, Hongshan Zhong, Ke Xu, Xianwei Meng
There are acknowledged risks of metastasis of cancer cells and obstructing cancer treatment from hypoxia. In this work, we design a multifunctional nanocomposite for treating hypoxia based on the oxygen release capability of CuO triggered by microwave (MW). Core-shell CuO@ZrO2 nanocomposites are prepared by confining CuO nanoparticles within the cavities of mesoporous ZrO2 hollow nanospheres. The 1-butyl-3-methylimidazolium hexafluorophosphate (IL) is loaded to the CuO@ZrO2 nanocomposites for improving microwave thermal therapy (MWTT)...
December 4, 2018: ACS Nano
Marco Papale, Elisabetta Ferretti, Giuseppe Battaglia, Diana Bellavia, Antonello Mai, Marco Tafani
During the past decades, several discoveries have established the role of epigenetic modifications and cellular microenvironment in tumor growth and progression. One of the main representatives concerning epigenetic modification is the polycomb group (PcG). It is composed of different highly conserved epigenetic effector proteins preserving, through several post-translational modifications of histones, the silenced state of the genes implicated in a wide range of central biological events such as development, stem cell formation, and tumor progression...
2018: Frontiers in Pediatrics
Xiteng Yin, Zheng Wei, Chuanhui Song, Chuanchao Tang, Wenguang Xu, Yufeng Wang, Junqi Xie, Zitong Lin, Wei Han
Objectives: The objectives of this study were to explore the mechanisms of metformin sensitization to hypoxia-induced gefitinib treatment in resistant head and neck squamous cell carcinoma (HNSCC) and evaluate the effects of this combined treatment strategy. Methods: The effects of gefitinib treatment on HNSCC were measured under normoxic and hypoxic conditions. The relationship between hypoxia and cell cycle and epithelial-mesenchymal transition (EMT) in tumor cells were analyzed...
2018: Cancer Management and Research
Silvan Türkcan, Louise Kiru, Dominik J Naczynski, Laura S Sasportas, Guillem Pratx
The process by which tumor cells take up 18F-fluorodeoxyglucose (FDG) is heterogeneous and influenced by a multitude of factors. In mouse tumor grafts, the core of the tumor often presents lower FDG uptake than the periphery. Whether this pattern is caused by the intrinsic avidity of individual cells for FDG, the density of viable cells in the tumor, or the perfusion of the radiotracer remains unknown. In this study, we used radioluminescence microscopy to measure FDG uptake in single cells isolated from the core and periphery of the tumor and found that differences in FDG uptake persist on the level of single cells...
December 3, 2018: Cancer Research
M Kery, N Oravcova, S Radenkovic, F Iuliano, J Tomaskova, T Golias
Pyruvate dehydrogenase kinase 1 (PDHK1) and carbonic anhydrase IX (CAIX) are two of the most hypoxia-inducing proteins in tumors. PDHK1 is involved in glucose metabolism and CAIX in pH regulation, and both appear necessary for model tumor growth. Their hypoxia induces their expression and enzymatic activity, and high expression level in human tumors predicts poor patient outcome. This paper targets these two proteins both pharmacologically and genetically and in vitro and in vivo because they can lead to decreased cancer cell survival and significantly reduce model tumor growth...
August 9, 2018: Neoplasma
Mariko Yamanoi, Kazuhiro Yamanoi, Chifumi Fujii, Michiko N Fukuda, Jun Nakayama
OBJECTIVES: To evaluate the expression of annexin A1 protein in patients with renal cell carcinoma. METHODS: Annexin A1 expression was examined in renal cell carcinoma specimens from 27 patients, and their disease-free survival was analyzed using the log-rank test. Annexin A1 knockdown in the human renal cell carcinoma cell line Caki-1 was carried out, and its proliferation, invasion, motility and adhesion were compared with those of control cells. RESULTS: In 13 out of 27 patients, annexin A1 was highly expressed in the membrane of renal cell carcinoma tumor cells, whereas in the rest of the patients, annexin A1 expression was weak or negligible in the membrane of those cells...
December 2, 2018: International Journal of Urology: Official Journal of the Japanese Urological Association
Shanshan Lin, Bo Zhu, Guozhi Huang, Qing Zeng, Chuhuai Wang
Studies have demonstrated that mesenchymal stem cells (MSCs) can promote tumor growth, and MSC microvesicles (MVs) are very important in the tumor microenvironment and information transfer between cells during tumorigenesis and development. However, the potential effects and mechanisms of MSC-MVs on tumor growth are still controversial. Here in this study, we investigated the roles and effects of human bone marrow MSC-MVs (hBMSC-MVs) on human osteosarcoma (U2OS) cell growth under hypoxia in vitro and in vivo...
November 30, 2018: Human Cell
Xinrui Zhao, Lidong Liu, Rui Li, Xuan Wei, Wenqing Luan, Peishu Liu, Jing Zhao
BACKGROUND Hypoxia induces cell apoptosis in the uterosacral ligaments of patients with pelvic organ prolapse by upregulation of hypoxia-inducible factor-1α (HIF-1α). This study aimed to investigate the effects of HIF-1α on human uterosacral ligament fibroblasts (hUSLFs) following treatment with the chemical inducer of hypoxia, cobalt chloride (CoCl2), and to explore the underlying mechanisms. MATERIAL AND METHODS Ten women who underwent hysterectomy for benign disease provided uterosacral ligament tissue for cell extraction...
December 3, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
Jiamin Peng, Huiyu Xu, Yuan Chen, Wei Wang, Lifen Zhu, Yanfei Shao, Jianchao Wang
Tumor vessel normalization can increase pericyte coverage, perfusion efficiency and immune infiltration, while reducing hypoxia, vessel leakage, CTC and metastasis. In this study, we systemically presented the expression pattern of tumor angiogenesis gene signatures in 31 cancer types and its association with immune infiltration and cancer metastasis. Specifically, READ, COAD etc. have relatively similar expression patterns with low GPAGs and high PPAGs. Patients with this expression pattern may benefit from tumor vessel normalization...
November 29, 2018: Biochemical and Biophysical Research Communications
Zhonghua Jiang, Hongmei Yang, Xiuyun Zhang, Zhendong Wang, Rong Rong, Xiaohong Wang
Histone deacetylase 1 (HDAC1) has been shown to be closely associated with tumor development. We investigated its effects on survival and biological behavior in gastric cancer (GC). HDAC1 expression and glycolysis activity were analyzed in a cohort of 252 samples of primary GC tumors and in vitro study. High HDAC1 (HDAC1High ) staining was seen in 60.7% patients with GCs, which was significantly greater than was seen in normal epithelial cells (19.4%; P<.005). HDAC1High expression was associated with larger tumor size (P=...
November 27, 2018: Human Pathology
Xiaoli Cai, Yanan Luo, Yang Song, Dong Liu, Hongye Yan, He Li, Dan Du, Chengzhou Zhu, Yuehe Lin
Despite great progress in photodynamic therapy (PDT), the therapeutic effect is still limited by some points, such as tumor hypoxia, the short lifetime and the limited action region of 1O2. Herein, a special kind of three-dimensional dendritic mesoporous silica nanosphere (3D-dendritic MSN) was synthesized and used as a robust nanocarrier to deliver abundant hydrophobic photosensitizer chlorin e6 (Ce6) to the A549 lung cancer cells. To address the tumor hypoxia issue, the nanozyme Pt nanoparticles (Pt NPs) were immobilized onto the channels of 3D-dendritic MSNs to catalyze the conversion of intracellular H2O2 to oxygen...
November 30, 2018: Nanoscale
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