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Autophagy and chemotherapy resistance

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https://www.readbyqxmd.com/read/29774126/autophagy-deficient-breast-cancer-shows-early-tumor-recurrence-and-escape-from-dormancy
#1
Hussein F Aqbi, Liliya Tyutyunyk-Massey, Rebecca C Keim, Savannah E Butler, Theresa Thekkudan, Supriya Joshi, Timothy M Smith, Dipankar Bandyopadhyay, Michael O Idowu, Harry D Bear, Kyle K Payne, David A Gewirtz, Masoud H Manjili
Breast cancer patients who initially respond to cancer therapies often succumb to distant recurrence of the disease. It is not clear why people with the same type of breast cancer respond to treatments differently; some escape from dormancy and relapse earlier than others. In addition, some tumor clones respond to immunotherapy while others do not. We investigated how autophagy plays a role in accelerating or delaying recurrence of neu-overexpressing mouse mammary carcinoma (MMC) following adriamycin (ADR) treatment, and in affecting response to immunotherapy...
April 24, 2018: Oncotarget
https://www.readbyqxmd.com/read/29766327/characterization-of-carfilzomib-resistant-non-small-cell-lung-cancer-cell-lines
#2
Neale T Hanke, Elliot Imler, Marilyn T Marron, Bruce E Seligmann, Linda L Garland, Amanda F Baker
PURPOSE: We previously showed that carfilzomib (CFZ) has potent anti-proliferative and cytotoxic activity in a broad range of lung cancer cell lines. Here we investigate possible mechanisms of CFZ acquired resistance in lung cancer cell lines. METHODS: CFZ-resistant non-small cell lung cancer (NSCLC) cell lines were developed by exposing A549 and H520 cells to stepwise increasing concentrations of CFZ. Resistance to CFZ and cross-resistance to bortezomib and other chemotherapy drugs was measured using the MTT assay...
May 15, 2018: Journal of Cancer Research and Clinical Oncology
https://www.readbyqxmd.com/read/29749374/microrna-125b-reverses-oxaliplatin-resistance-in-hepatocellular-carcinoma-by-negatively-regulating-eva1a-mediated-autophagy
#3
Wei-Wei Ren, Dan-Dan Li, Xiao-Long Li, Ya-Ping He, Le-Hang Guo, Lin-Na Liu, Hui-Xiong Xu, Li-Ping Sun, Xiao-Ping Zhang
EVA1A (also known as transmembrane protein 166) is a transmembrane protein involved in the regulation of autophagy that acts as an adaptor protein to recruit or bind proteins in the lysosome or endoplasmic reticulum. In the present study, we identified EVA1A as a target of microRNA-125b (miR-125b), a member of a highly conserved family of miRNAs that has been proposed as a biomarker for hepatocellular carcinoma (HCC). Analysis of oxaliplatin-sensitive and oxaliplatin-resistant HCC cell lines showed that miR-125b is downregulated in resistant cells and its overexpression in sensitive cells decreased resistance to oxaliplatin by inhibiting cell proliferation, migration and epithelial-mesenchymal transition (EMT)...
May 10, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29740490/silencing-livin-improved-the-sensitivity-of-colon-cancer-cells-to-5-fluorouracil-by-regulating-crosstalk-between-apoptosis-and-autophagy
#4
Shuai Liu, Xin Li, Qing Li, Hongjun Liu, Yulong Shi, Hongqing Zhuo, Chensheng Li, Huijuan Zhu
Colorectal cancer (CRC) is the third most common cause of cancer-associated mortality worldwide. Currently, 5-fluorouracil (5-FU) remains a widely used chemotherapeutic drug in the treatment of CRC; however, 5-FU resistance during treatment has become a common problem. Livin, a member of the inhibitor of apoptosis protein family, is considered to be associated with tumor resistance to chemotherapy. In the present study, Livin-silenced cells were generated by introducing a lentivirus into HCT116 and SW620 colon cancer cell lines...
May 2018: Oncology Letters
https://www.readbyqxmd.com/read/29729190/baicalein-targets-gtpase-mediated-autophagy-to-eliminate-liver-tumor-initiating-stem-cell-like-cells-resistant-to-mtorc1-inhibition
#5
Raymond Wu, Ramachandran Murali, Yasuaki Kabe, Samuel W French, Yi-Ming Chiang, Siyu Liu, Linda Sher, Clay C Wang, Stan Louie, Hidekazu Tsukamoto
Drug resistance is a major problem in the treatment of liver cancer. mTORC1 inhibitors have been tested for the treatment of liver cancer based on hyperactive mTOR in this malignancy. However, their clinical trials showed poor outcome due likely to their ability to upregulate CD133 and promote chemoresistance. CD133+ tumor initiating stem cell-like cells (TICs) isolated from mouse and human liver tumors are chemoresistant, and identification of an approach to abrogate this resistance is desired. In search for a compound which rescinds TIC's resistance to mTORC1 inhibition and improves chemotherapy, we identified baicalein (BC) which selectively chemosensitizes TICs and the human HCC cell line Huh7 cells but not mouse and human primary hepatocytes...
May 5, 2018: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/29708079/barriers-to-cancer-nutrition-therapy-excess-catabolism-of-muscle-and-adipose-tissues-induced-by-tumour-products-and-chemotherapy
#6
Dalton L Schiessel, Vickie E Baracos
Cancer-associated malnutrition is driven by reduced dietary intake and by underlying metabolic changes (such as inflammation, anabolic resistance, proteolysis, lipolysis and futile cycling) induced by the tumour and activated immune cells. Cytotoxic and targeted chemotherapies also elicit proteolysis and lipolysis at the tissue level. In this review, we summarise specific mediators and chemotherapy effects that provoke excess proteolysis in muscle and excess lipolysis in adipose tissue. A nutritionally relevant question is whether and to what degree these catabolic changes can be reversed by nutritional therapy...
April 30, 2018: Proceedings of the Nutrition Society
https://www.readbyqxmd.com/read/29707136/bnip3-modulates-the-interface-between-b16-f10-melanoma-cells-and-immune-cells
#7
Erminia Romano, Nicole Rufo, Hannelie Korf, Chantal Mathieu, Abhishek D Garg, Patrizia Agostinis
The hypoxia responsive protein BNIP3, plays an important role in promoting cell death and/or autophagy, ultimately resulting in a cancer type-dependent, tumour-enhancer or tumour-suppressor activity. We previously reported that in melanoma cells, BNIP3 regulates cellular morphology, mitochondrial clearance, cellular viability and maintains protein expression of CD47, a pro-cancerous, immunosuppressive 'don't eat me' signal. Surface exposed CD47 is often up-regulated by cancer cells to avoid clearance by phagocytes and to suppress immunogenic cell death (ICD) elicited by anticancer therapies...
April 3, 2018: Oncotarget
https://www.readbyqxmd.com/read/29702190/mirna-146a-promotes-chemotherapy-resistance-in-lung-cancer-cells-by-targeting-dna-damage-inducible-transcript-3-chop
#8
Wenfeng Tan, Yi Liao, Yang Qiu, Hongxiang Liu, Deli Tan, Tao Wu, Meng Tang, Shixin Zhang, Haidong Wang
The underlying molecular mechanism of lung cancer drug resistance is poorly understood. The mediator of endoplasmic reticulum stress CHOP (DNA damage inducible transcript 3) promotes stress-induced apoptosis and appears to function as a transcription factor in multiple diseases. However, its potential contributions to multidrug resistance in solid tumors is unknown. Here, we investigated CHOP expression in tumor tissues form 69 lung cancer patients, finding that deficient CHOP expression is associated with poor prognosis...
April 24, 2018: Cancer Letters
https://www.readbyqxmd.com/read/29693166/hypoxia-induced-autophagy-promotes-gemcitabine-resistance-in-human-bladder-cancer-cells-through-hypoxia-inducible-factor-1%C3%AE-activation
#9
Xiaoyu Yang, Hubin Yin, Yunzhi Zhang, Xinyuan Li, Hang Tong, Yizhou Zeng, Quan Wang, Weiyang He
Overcoming the chemoresistance of bladder cancer is a pivotal obstacle in clinical treatments. Hypoxia widely exists in solid tumors and has been demonstrated to contribute to chemoresistance through hypoxia-inducible factor 1α (HIF‑1α)-mediated autophagy in several types of cancer. However, it is unclear whether HIF‑1α-mediated autophagy and chemoresistance occur in bladder cancer. The present study demonstrated that HIF‑1α was overexpressed in 20 bladder cancer tissues compared with matched paracarcinoma tissues...
April 24, 2018: International Journal of Oncology
https://www.readbyqxmd.com/read/29672851/human-hepatocellular-carcinoma-protection-by-melatonin
#10
REVIEW
Keywan Mortezaee
Despite great scientific breakthroughs toward understanding the identity of human hepatocellular carcinoma (HCC) mechanistically, there are still no clinically efficient therapeutic methods for this cancer. Melatonin (N-acetyl-5-methoxytryptamine) is a multi-tasking hormone that has long been known for its anti-cancer activity against various human cancers including HCC, which is a focus of this review. PubMed database was searched for relevant articles with the keywords: hepatocellular carcinoma (HCC), melatonin, apoptosis, proliferation, invasion, angiogenesis, autophagy, oxidative stress, tumor immunity, and mitogen-activated protein kinase (MAPK) focusing on just human cell lines and English language articles...
April 19, 2018: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29670369/inhibition-of-nipbl-enhances-the-chemosensitivity-of-non-small-cell-lung-cancer-cells-via-the-dna-damage-response-and-autophagy-pathway
#11
Lei Zheng, Huanhuan Zhou, Liwei Guo, Xiaoling Xu, Shengjie Zhang, Weizhen Xu, Weimin Mao
Background: Previously, we reported that high expression of nipped-B-like protein (NIPBL) was strongly correlated with poor prognosis, tumor differentiation, and lymph node metastasis. Survival analysis indicated that NIPBL expression was a potential prognostic factor for non-small cell lung cancer (NSCLC). Moreover, loss of NIPBL decreased lung cancer cells proliferation, migration, invasion and promoted apoptosis as well as sensitivity to chemotherapeutic agents. However, the deep mechanisms were not explored...
2018: OncoTargets and Therapy
https://www.readbyqxmd.com/read/29669822/crosstalk-between-apoptosis-and-autophagy-is-regulated-by-the-arginylated-bip-beclin-1-p62-complex
#12
Yong J Lee, Xinxin Song, Dae-Hee Lee, Ashok-Kumar Dilly, Young-Sun Lee, Haroon Asif Choudry, Yong Tae Kwon, David L Bartlett
Emerging evidence demonstrates that autophagy and apoptosis are interconnected and their interplay greatly affects cell death. However, the key regulators in this crosstalk remain elusive. Therefore, the role of N-terminal arginylated BiP (R-BiP)/Beclin-1/p62 complex was examined in the crosstalk between apoptosis and autophagy during combination chemotherapy with mitomycin C and bortezomib using immunoblot, immunoprecipitation, and cellular imaging assays in wild-type and genetically engineered colorectal cancer cells...
April 18, 2018: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/29663364/impact-of-iaspp-on-chemoresistance-through-plk1-and-autophagy-in-ovarian-clear-cell-carcinoma
#13
Ka-Kui Chan, Oscar Gee-Wan Wong, Esther Shuk-Ying Wong, Karen Kar-Loen Chan, Philip Pun-Ching Ip, Ka-Yu Tse, Annie Nga-Yin Cheung
Ovarian clear cell carcinoma (OCCC) is a type of epithelial ovarian cancer that is strongly associated with endometriosis, resistance against conventional chemotherapy and thus poorer prognosis. The expression of inhibitory member of the ASPP family proteins (iASPP) and Polo-like kinase (PLK)1 were significantly higher in OCCC compared to benign cystadenomas and endometriosis. Both protein expressions were found to correlate with chemoresistance in patients with OCCC while high iASPP expression alone was significantly associated with a poor patient survival...
April 16, 2018: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/29658588/autophagy-inhibition-potentiates-saha%C3%A2-mediated-apoptosis-in-glioblastoma-cells-by-accumulation-of-damaged-mitochondria
#14
Kovooru Lohitesh, Heena Saini, Abhilasha Srivastava, Sudeshna Mukherjee, Aniruddha Roy, Rajdeep Chowdhury
Glioblastoma multiforme (GBM), often referred to as a grade IV astrocytoma, is the most invasive type of tumor arising from glial cells. The main treatment options for GBM include surgery, radiation and chemotherapy. However, these treatments tend to be only palliative rather than curative. Poor prognosis of GBM is due to its marked resistance to standard therapy. Currently, temozolomide (TMZ), an alkylating agent is used for treatment of GBM. However, GBM cells can repair TMZ‑induced DNA damage and therefore diminish the therapeutic efficacy of TMZ...
April 16, 2018: Oncology Reports
https://www.readbyqxmd.com/read/29645088/impact-of-iaspp-on-chemoresistance-through-plk1-and-autophagy-in-ovarian-clear-cell-carcinoma
#15
Ka-Kui Chan, Oscar Gee-Wan Wong, Esther Shuk-Ying Wong, Karen Kar-Loen Chan, Philip Pun-Ching Ip, Ka-Yu Tse, Annie Nga-Yin Cheung
Ovarian clear cell carcinoma (OCCC) is a type of epithelial ovarian cancer that is strongly associated with endometriosis, resistance against conventional chemotherapy and thus poorer prognosis. The expression of inhibitory member of the ASPP family proteins (iASPP) and Polo-like kinase (PLK)1 were significantly higher in OCCC compared to benign cystadenomas and endometriosis. Both protein expressions were found to correlate with chemoresistance in patients with OCCC while high iASPP expression alone was significantly associated with a poor patient survival...
April 12, 2018: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/29644941/role-of-micrornas-in-treatment-response-in-prostate-cancer
#16
Anshuli Razdan, Paul de Souza, Tara Laurie Roberts
Prostate cancer (PCa) is the most common non-skin cancer in men worldwide, resulting in significant mortality and morbidity. Depending on the grade and stage of the cancer, patients may be given radiation therapy, hormonal therapy, or chemotherapy. However, more than half these patients develop resistance to treatment, leading to disease progression and metastases, often with lethal consequences. MicroRNAs (miRNAs) are short, non-coding RNAs, which regulate numerous physiological as well as pathological processes, including cancer...
March 15, 2018: Current Cancer Drug Targets
https://www.readbyqxmd.com/read/29611065/ros-induced-autophagy-reduces-b16f10-melanoma-cell-proliferative-activity
#17
Gustavo Miranda Pires Santos, Susana C P S Oliveira, Juliana C S Monteiro, Sandra R Fagnani, Fernando Pires Sampaio, Neandder Andrade Correia, Pedro J L Crugeira, Antonio L B Pinheiro
Cancer is a pathology characterized by increased cell progression and/or reduced programmed cell death. Melanoma shows a rapid increase in cell progression and its resistance to chemotherapy is associated with uncontrolled apoptosis and to mechanisms that increase the flow of the drug out of the cell. The objective of this study was to evaluate the effects of photodynamic therapy (PDT) on the cell proliferation and cellular alterations in B16F10 murine melanoma. For that, four experimental groups were evaluated: the control group; laser group (ʎ = 660 ηm, 40 mW, 2...
April 2, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29575133/gemcitabine-induces-apoptosis-and-autophagy-via-the-ampk-mtor-signaling-pathway-in-pancreatic-cancer-cells
#18
Jinhui Zhu, Yan Chen, Yun Ji, Yuanquan Yu, Yun Jin, Xiaoxiao Zhang, Jiale Zhou
Gemcitabine (GEM)-based chemotherapy is a commonly used treatment for pancreatic cancer. However, acquired drug resistance, a major problem in pancreatic cancer treatment, causes a reduction in the survival rate of patients with cancer. In this study, we attempted to reveal the molecular mechanism of GEM resistance. Our data showed that GEM treatment inhibits cell growth, induces apoptosis, and activates autophagy via the AMP-activated protein kinase (AMPK) pathway. The combination of GEM treatment and AMPK knockdown resulted in a dramatic increase of apoptosis and inhibition of autophagy...
March 25, 2018: Biotechnology and Applied Biochemistry
https://www.readbyqxmd.com/read/29568237/resistance-a-major-hindrance-to-chemotherapy-in-hepatocellular-carcinoma-an-insight
#19
REVIEW
K Lohitesh, Rajdeep Chowdhury, Sudeshna Mukherjee
Hepatocellular carcinoma (HCC) is one of the leading causes of cancer mortality, accounting for almost 90% of total liver cancer burden. Surgical resection followed by adjuvant and systemic chemotherapy are the most meticulously followed treatment procedures but the complex etiology and high metastatic potential of the disease renders surgical treatment futile in majority of the cases. Another hindrance to the scenario is the acquired resistance to drugs resulting in relapse of the disease. Hence, to provide insights into development of novel therapeutic targets and diagnostic biomarkers, this review focuses on the various molecular mechanisms underlying chemoresistance in HCC...
2018: Cancer Cell International
https://www.readbyqxmd.com/read/29562589/an-interplay-between-senescence-apoptosis-and-autophagy-in-glioblastoma-multiforme-role-in-pathogenesis-and-therapeutic-perspective
#20
REVIEW
Elzbieta Pawlowska, Joanna Szczepanska, Magdalena Szatkowska, Janusz Blasiak
Autophagy, cellular senescence, programmed cell death and necrosis are key responses of a cell facing a stress. These effects are partly interconnected, but regulation of their mutual interactions is not completely clear. That regulation seems to be especially important in cancer cells, which have their own program of development and demand more nutrition and energy than normal cells. Glioblastoma multiforme (GBM) belongs to the most aggressive and most difficult to cure cancers, so studies on its pathogenesis and new therapeutic strategies are justified...
March 17, 2018: International Journal of Molecular Sciences
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