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https://www.readbyqxmd.com/read/28792534/primary-bovine-skeletal-muscle-cells-enters-apoptosis-rapidly-via-the-intrinsic-pathway-when-available-oxygen-is-removed
#1
Sissel Beate Rønning, Petter Vejle Andersen, Mona Elisabeth Pedersen, Kristin Hollung
Muscle cells undergo changes post-mortem during the process of converting muscle into meat, and this complex process is far from revealed. Recent reports have suggested programmed cell death (apoptosis) to be important in the very early period of converting muscle into meat. The dynamic balance that occurs between anti-apoptotic members, such as Bcl-2, and pro-apoptotic members (Bid, Bim) helps determine whether the cell initiates apoptosis. In this study, we used primary bovine skeletal muscle cells, cultured in monolayers in vitro, to investigate if apoptosis is induced when oxygen is removed from the growth medium...
2017: PloS One
https://www.readbyqxmd.com/read/28652996/mitochondrial-stress-and-activation-of-pi3k-and-akt-survival-pathway-in-bladder-ischemia
#2
Jing-Hua Yang, Mike B Siroky, Subbarao V Yalla, Kazem M Azadzoi
PURPOSE: Detrusor overactivity contributes to bothersome constellation of lower urinary tract symptoms (LUTS) in men and women as they age. However, the underlying mechanisms of non-obstructive detrusor overactivity and LUTS remain largely unknown. Growing evidence suggests that ischemia may be an independent factor in the development of non-obstructive bladder dysfunction. Our goal was to determine the effects of ischemia on detrusor function and voiding behavior and define redox-mediated cellular stress and cell survival signaling in the ischemic bladder...
2017: Research and Reports in Urology
https://www.readbyqxmd.com/read/28522876/comparative-proteomic-analysis-of-the-mitochondria-associated-er-membrane-mam-in-a-long-term-type-2-diabetic-rodent-model
#3
Jacey Hongjie Ma, Shichen Shen, Joshua J Wang, Zhanwen He, Amanda Poon, Jun Li, Jun Qu, Sarah X Zhang
The mitochondria-associated ER membrane (MAM) plays a critical role in cellular energetics and calcium homeostasis; however, how MAM is affected under diabetic condition remains elusive. This study presented a comprehensive proteome profiling of isolated brain MAM from long-term type 2 diabetic mice vs. non-diabetic controls. MAM protein was extracted efficiently by a surfactant-aided precipitation/on-pellet digestion (SOD) method, and MAM proteome was quantified by an ion-current-based MS1 method combined with nanoLC-MS/MS...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28472774/mitochondria-chaperone-grp75-moonlighting-as-a-cell-cycle-controller-to-derail-endocytosis-provides-an-opportunity-for-nanomicrosphere-intracellular-delivery
#4
Zhihui Gao, Xiuran Niu, Qing Zhang, Hang Chen, Aiai Gao, Shanshan Qi, Rong Xiang, Mattias Belting, Sihe Zhang
Understanding how cancer cells regulate endocytosis during the cell cycle could lead us to capitalize this event pharmacologically. Although certain endocytosis pathways are attenuated during mitosis, the endocytosis shift and regulation during the cell cycle have not been well clarified. The conventional concept of glucose-regulated proteins (GRPs) as protein folding chaperones was updated by discoveries that translocated GRPs assume moonlighting functions that modify the immune response, regulate viral release, and control intracellular trafficking...
April 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/28445005/proteomic-based-investigations-on-the-mode-of-action-of-the-marine-anticancer-compound-rhizochalinin
#5
Sergey A Dyshlovoy, Katharina Otte, Simone Venz, Jessica Hauschild, Heike Junker, Tatyana N Makarieva, Stefan Balabanov, Winfried H Alsdorf, Ramin Madanchi, Friedemann Honecker, Carsten Bokemeyer, Valentin A Stonik, Gunhild von Amsberg
Rhizochalinin (Rhiz) is a novel marine natural sphingolipid-like compound which shows promising in vitro and in vivo activity in human castration-resistant prostate cancer (CRPC). In the present study, a global proteome screening approach was applied to investigate molecular targets and biological processes affected by Rhiz in CRPC. Bioinformatical analysis of the data predicted an anti-migratory effect of Rhiz on cancer cells. Validation of proteins involved in the cancer-associated processes, including cell migration and invasion, revealed down-regulation of specific isoforms of stathmin and LASP1, as well as up-regulation of Grp75, keratin 81, and precursor IL-1β by Rhiz...
April 26, 2017: Proteomics
https://www.readbyqxmd.com/read/28343382/associations-among-protein-biomarkers-and-ph-and-color-traits-in-longissimus-thoracis-and-rectus-abdominis-muscles-in-protected-designation-of-origin-maine-anjou-cull-cows
#6
Mohammed Gagaoua, Sébastien Couvreur, Guillain Le Bec, Ghislain Aminot, Brigitte Picard
This study investigated the relationships among a list of 23 protein biomarkers with CIE-L*a*b* meat color traits and ultimate pH on Longissimus thoracis (LT) and Rectus abdominis (RA) muscles of 48 protected designation of origin Maine-Anjou cows. The technological parameters were correlated with several biomarkers and were in some cases muscle-dependent. More biomarkers were related to pHu in LT than in RA muscle. Some consistencies were found, by the common correlation of pHu with MyHC-IIa and MyHC-IIx. The pHu of the LT muscle was also correlated with other cytoskeletal entities and proteins belonging to metabolism and cellular stress...
May 3, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28288859/mitochondrial-toxicity-of-perfluorooctane-sulfonate-in-mouse-embryonic-stem-cell-derived-cardiomyocytes
#7
Lei-Lei Tang, Jia-Dan Wang, Ting-Ting Xu, Zhe Zhao, Jia-Jie Zheng, Ren-Shan Ge, Dan-Yan Zhu
Perfluorooctane sulfonate (PFOS) is a persistent organic contaminant that may cause cardiotoxicity in animals and humans. However, little is known about the underlying mechanism by which it affects the organelle toxicity in cardiomyocytes during the cardiogenesis. Our previous proteomic study showed that differences of protein expression mainly existed in mitochondria of cardiomyocytes differentiated from embryonic stem (ES) cells after exposure to PFOS. Here, we focused on mitochondrial toxicity of PFOS in ES cell-derived cardiomyocytes...
May 1, 2017: Toxicology
https://www.readbyqxmd.com/read/28098881/overexpression-of-grp75-inhibits-inflammation-in-a-rat-model-of-intracerebral-hemorrhage
#8
Lian-Jie Lv, Jia Li, Hai-Bo Qiao, Ben-Jin Nie, Peng Lu, Feng Xue, Zhi-Ming Zhang
Glucose‑regulated protein 75 (GRP75) is a member of the heat shock protein 70 family and previous studies have demonstrated that GRP75 is involved in diseases of the central nervous system. However, the biological function of GRP75 in intracerebral hemorrhage (ICH) remains to be clarified. Thus, the aim of the present study was to evaluate the effects of GRP75 in a rat model of ICH. Western blotting was used to detect the protein expression of GRP75, active caspase‑3, Bax, Bcl‑2, p‑Akt and Akt in brain tissues following ICH...
March 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28096195/multifunctional-mitochondrial-epac1-controls-myocardial-cell-death
#9
Loubina Fazal, Marion Laudette, Sílvia Paula-Gomes, Sandrine Pons, Caroline Conte, Florence Tortosa, Pierre Sicard, Yannis Sainte-Marie, Malik Bisserier, Olivier Lairez, Alexandre Lucas, Jérôme Roy, Bijan Ghaleh, Jérémy Fauconnier, Jeanne Mialet-Perez, Frank Lezoualc'h
RATIONALE: Although the second messenger cyclic AMP (cAMP) is physiologically beneficial in the heart, it largely contributes to cardiac disease progression when dysregulated. Current evidence suggests that cAMP is produced within mitochondria. However, mitochondrial cAMP signaling and its involvement in cardiac pathophysiology are far from being understood. OBJECTIVE: To investigate the role of MitEpac1 (mitochondrial exchange protein directly activated by cAMP 1) in ischemia/reperfusion injury...
February 17, 2017: Circulation Research
https://www.readbyqxmd.com/read/28060261/study-of-endoplasmic-reticulum-and-mitochondria-interactions-by-in-situ-proximity-ligation-assay-in-fixed-cells
#10
Emily Tubbs, Jennifer Rieusset
Structural interactions between the endoplasmic reticular (ER) and mitochondrial membranes, in domains known as mitochondria-associated membranes (MAM), are crucial hubs for cellular signaling and cell fate. Particularly, these inter-organelle contact sites allow the transfer of calcium from the ER to mitochondria through the voltage-dependent anion channel (VDAC)/glucose-regulated protein 75 (GRP75)/inositol 1,4,5-triphosphate receptor (IP3R) calcium channeling complex. While this subcellular compartment is under intense investigation in both physiological and pathological conditions, no simple and sensitive method exists to quantify the endogenous amount of ER-mitochondria contact in cells...
December 10, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28031236/proteomics-analysis-of-ovarian-cancer-cell-lines-and-tissues-reveals-drug-resistance-associated-proteins
#11
Isa N Cruz, Helen M Coley, Holger B Kramer, Thumuluru Kavitah Madhuri, Nur A M Safuwan, Ana Rita Angelino, Min Yang
BACKGROUND: Carboplatin and paclitaxel form the cornerstone of chemotherapy for epithelial ovarian cancer, however, drug resistance to these agents continues to present challenges. Despite extensive research, the mechanisms underlying this resistance remain unclear. MATERIALS AND METHODS: A 2D-gel proteomics method was used to analyze protein expression levels of three human ovarian cancer cell lines and five biopsy samples. Representative proteins identified were validated via western immunoblotting...
January 2, 2017: Cancer Genomics & Proteomics
https://www.readbyqxmd.com/read/27909249/mortalin-mediated-and-erk-controlled-targeting-of-hif-1%C3%AE-to-mitochondria-confers-resistance-to-apoptosis-under-hypoxia
#12
Ilias Mylonis, Maria Kourti, Martina Samiotaki, George Panayotou, George Simos
Hypoxia inducible factor-1 (HIF-1) is the main transcriptional activator of the cellular response to hypoxia and an important target of anticancer therapy. Phosphorylation by ERK1 and/or ERK2 (MAPK3 and MAPK1, respectively; hereafter ERK) stimulates the transcriptional activity of HIF-1α by inhibiting its CRM1 (XPO1)-dependent nuclear export. Here, we demonstrate that phosphorylation by ERK also regulates the association of HIF-1α with a so-far-unknown interaction partner identified as mortalin (also known as GRP75 and HSPA9), which mediates non-genomic involvement of HIF-1α in apoptosis...
January 15, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/27769873/mitochondrial-proteomic-alterations-caused-by-long-term-low-dose-copper-exposure-in-mouse-cortex
#13
Xuemei Lin, Gang Wei, Zhijun Huang, Zhongsen Qu, Xinfeng Huang, Hua Xu, Jianjun Liu, Zhixiong Zhuang, Xifei Yang
Mitochondrial dysfunction is involved in neurotoxicity caused by exposure of various chemicals such as copper. However, the effects of long-term low-dose copper exposure on mitochondrial proteome remain unclear. In this study, we found the treatment of copper (0.13ppm copper sulfate in drinking water) for 12 months caused abnormal expression of a total of 13 mitochondrial proteins (7 up-regulated and 6 down-regulated) as revealed by two-dimensional electrophoresis coupled with mass spectrometry in mouse cortex...
November 30, 2016: Toxicology Letters
https://www.readbyqxmd.com/read/27667453/-mitochondrial-signal-peptide-guides-egfp-grp75-fusion-proteins-into-mitochondria
#14
Hang Chen, Xiuran Niu, Aiai Gao, Sihe Zhang
Objective To investigate the role of mitoch-ondrial signal peptide in guiding enhanced green fluorescent protein-glucose-regulated protein 75 fusion proteins (EGFP-GRP75) into mitochondria. Methods At first, the signal peptide gene and GRP75 domain genes were spliced by overlap extension PCR. Unphosphorylatable mutant T62A/S65A, phospho-mimic mutant T62D/S65D and substrate binding-defective mutant V482F were further created through site-directed mutagenesis PCR. The fusion gene fragments were ligated into pEGFPC1 expression plasmid, respectively...
October 2016: Xi Bao Yu Fen Zi Mian Yi Xue za Zhi, Chinese Journal of Cellular and Molecular Immunology
https://www.readbyqxmd.com/read/27475989/complement-triggers-relocation-of-mortalin-grp75-from-mitochondria-to-the-plasma-membrane
#15
Niv Mazkereth, Francesco Rocca, Jennifer-Rose Schubert, Claudia Geisler, Yaron Hillman, Alexander Egner, Zvi Fishelson
Mortalin/GRP75 is a ubiquitously expressed mitochondrial chaperon that is overexpressed in cancer. Mortalin protects cells from complement-dependent cytotoxicity (CDC) and facilitates elimination of the complement C5b-9 complexes from the cell surface. We performed a nanoscopical study aimed at imaging the distribution of the C5b-9 complexes in the plasma membrane and the postulated relocation of mortalin from the mitochondria to the plasma membrane. To gain a resolution of 35nm, the locations of the C5b-9 complex and mortalin were imaged with a STED (Stimulated Emission Depletion) microscope at sub-diffraction resolution...
July 21, 2016: Immunobiology
https://www.readbyqxmd.com/read/27183614/regulation-of-complement-dependent-cytotoxicity-by-micrornas-mir-200b-mir-200c-and-mir-217
#16
Yaron Hillman, Niv Mazkereth, Luba Farberov, Noam Shomron, Zvi Fishelson
The impact of microRNAs (miRNAs) known to regulate numerous biologic processes on complement-dependent cytotoxicity (CDC) was investigated in K562 cells. The C5b-9 complex is the executioner of CDC. Cells protect themselves from CDC by C5b-9 elimination, a process involving the mitochondrial chaperone mortalin/GRP75. Potential miR-200 (b and c) and miR-217 regulatory sites were identified in mortalin mRNA. Overexpression of miR-200b/c or miR-217 lowered the expression of mortalin mRNA. miRNA inhibitors for miR-200b, miR-200c, or miR-217 enhanced mortalin mRNA level...
June 15, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27090015/grp75-upregulates-clathrin-independent-endocytosis-through-actin-cytoskeleton-reorganization-mediated-by-the-concurrent-activation-of-cdc42-and-rhoa
#17
Hang Chen, Zhihui Gao, Changzheng He, Rong Xiang, Toin H van Kuppevelt, Mattias Belting, Sihe Zhang
Therapeutic macromolecules are internalized into the cell by either clathrin-mediated endocytosis (CME) or clathrin-independent endocytosis (CIE). Although some chaperone proteins play an essential role in CME (e.g. Hsc70 in clathrin uncoating), relatively few of these proteins are functionally involved in CIE. We previously revealed a role for the mitochondrial chaperone protein GRP75 in heparan sulfate proteoglycan (HSPG)-mediated, membrane raft-associated macromolecule endocytosis. However, the mechanism underlying this process remains unclear...
May 1, 2016: Experimental Cell Research
https://www.readbyqxmd.com/read/27039024/role-of-human-grp75-in-mirna-mediated-regulation-of-dengue-virus-replication
#18
Pavan Kumar Kakumani, Guruprasad R Medigeshi, Inderjeet Kaur, Pawan Malhotra, Sunil K Mukherjee, Raj K Bhatnagar
In recent times, RNAi has emerged as an important defence system that regulates replication of pathogens in host cells. Many RNAi related host factors especially the host miRNAs play important roles in all intrinsic cellular functions, including viral infection. We have been working on identification of mammalian host factors involved in Dengue virus infection. In the present study, we identified Glucose Regulated Protein 75kDa (GRP75), as a host factor that is associated with dicer complex, in particular with HADHA (trifunctional enzyme subunit alpha, mitochondrial), an auxiliary component of dicer complex...
July 15, 2016: Gene
https://www.readbyqxmd.com/read/26959487/endoplasmic-reticulum-stress-and-autophagy-in-homocystinuria-patients-with-remethylation-defects
#19
Ainhoa Martínez-Pizarro, Lourdes R Desviat, Magdalena Ugarte, Belén Pérez, Eva Richard
Proper function of endoplasmic reticulum (ER) and mitochondria is crucial for cellular homeostasis, and dysfunction at either site as well as perturbation of mitochondria-associated ER membranes (MAMs) have been linked to neurodegenerative and metabolic diseases. Previously, we have observed an increase in ROS and apoptosis levels in patient-derived fibroblasts with remethylation disorders causing homocystinuria. Here we show increased mRNA and protein levels of Herp, Grp78, IP3R1, pPERK, ATF4, CHOP, asparagine synthase and GADD45 in patient-derived fibroblasts suggesting ER stress and calcium perturbations in homocystinuria...
2016: PloS One
https://www.readbyqxmd.com/read/26955804/the-clinicopathological-significance-of-mortalin-overexpression-in-invasive-ductal-carcinoma-of-breast
#20
Haidan Jin, Meiying Ji, Liyan Chen, Qixiang Liu, Shuanlong Che, Ming Xu, Zhenhua Lin
BACKGROUND: Mortalin/GRP75 is a ubiquitous mitochondrial chaperone which related to the cytosolic heat shock protein 70 (HSP70), and plays a role in carcinogenesis. This study aims to investigate the Mortalin expression in breast cancer and its correlation with the outcome of the patients with breast cancer. METHODS: A total of 155 invasive ductal carcinoma of breast patients with strict follow-up, 52 ductal carcinoma in situ (DCIS) and 45 adjacent non-tumor breast tissues were selected for immunohistochemical (IHC) staining of Mortalin protein...
March 9, 2016: Journal of Experimental & Clinical Cancer Research: CR
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