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autophagy and heat shock protein

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https://www.readbyqxmd.com/read/29894736/torpor-arousal-cycles-in-syrian-hamster-heart-are-associated-with-transient-activation-of-the-protein-quality-control-system
#1
Marit Wiersma, Thais M A Beuren, Edwin L de Vrij, Vera A Reitsema, Jantje J Bruintjes, Hjalmar R Bouma, Bianca J J M Brundel, Robert H Henning
Hibernation consists of torpor, with marked suppression of metabolism and physiological functions, alternated with arousal periods featuring their full restoration. The heart is particularly challenged, exemplified by its rate reduction from 400 to 5-10 beats per minute during torpor in Syrian hamsters. In addition, during arousals, the heart needs to accommodate the very rapid return to normal function, which lead to our hypothesis that cardiac function during hibernation is supported by maintenance of protein homeostasis through adaptations in the protein quality control (PQC) system...
June 9, 2018: Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/29867441/cerebrospinal-fluid-concentration-of-key-autophagy-protein-lamp2-changes-little-during-normal-aging
#2
David A Loeffler, Andrea C Klaver, Mary P Coffey, Jan O Aasly
Autophagy removes both functional and damaged intracellular macromolecules from cells via lysosomal degradation. Three autophagic mechanisms, namely macroautophagy, chaperone-mediated autophagy (CMA), and microautophagy, have been described in mammals. Studies in experimental systems have found macroautophagy and CMA to decrease with normal aging, despite the fact that oxidative stress, which can activate both processes, increases with normal aging. Whether autophagic mechanisms decrease in the human brain during normal aging is unclear...
2018: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29801784/nitrogen-starvation-triggers-cellular-accumulation-of-triacylglycerol-in-metarhizium-robertsii
#3
Yixiong Chen, Kai Cen, Yuzhen Lu, Siwei Zhang, Yanfang Shang, Chengshu Wang
Nitrogen starvation can induce cellular triacylglycerol (TAG) accumulation in different organisms with an unclear mechanism. In this study, we performed nutrient starvation and lipid droplet (LD) proteomics analyses of the filamentous fungus Metarhizium robertsii. Our results indicated that nitrogen starvation activated cell autophagic activity but inhibited the internalization of LDs into vacuoles for degradation. LD proteomic analyses identified an array of differentially accumulated proteins including autophagy-related (ATG) proteins, heat shock proteins, TAG metabolic and phospholipid biosynthetic enzymes when the fungus was grown in different nutrient conditions...
June 2018: Fungal Biology
https://www.readbyqxmd.com/read/29774376/roles-of-heat-shock-factor-1-beyond-the-heat-shock-response
#4
REVIEW
János Barna, Péter Csermely, Tibor Vellai
Various stress factors leading to protein damage induce the activation of an evolutionarily conserved cell protective mechanism, the heat shock response (HSR), to maintain protein homeostasis in virtually all eukaryotic cells. Heat shock factor 1 (HSF1) plays a central role in the HSR. HSF1 was initially known as a transcription factor that upregulates genes encoding heat shock proteins (HSPs), also called molecular chaperones, which assist in refolding or degrading injured intracellular proteins. However, recent accumulating evidence indicates multiple additional functions for HSF1 beyond the activation of HSPs...
May 17, 2018: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/29764935/the-disorderly-conduct-of-hsc70-and-its-interaction-with-the-alzheimer-s-related-tau-protein
#5
Isabelle R Taylor, Atta Ahmad, Taia Wu, Bryce A Nordhues, Anup Bhullar, Jason E Gestwicki, Erik R P Zuiderweg
Hsp70 chaperones bind to various protein substrates for folding, trafficking, and degradation. Considerable structural information is available about how prokaryotic Hsp70 (DnaK) binds substrates, but less is known about mammalian Hsp70s, of which there are 13 isoforms encoded in the human genome. Here, we report the interaction between the human Hsp70 isoform heat shock cognate 71 KDa protein (Hsc70 or HSPA8) and peptides derived from the microtubule-associated protein tau, which is linked to Alzheimer's disease...
May 15, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29761889/a-novel-human-s10f-hsp20-mutation-induces-lethal-peripartum-cardiomyopathy
#6
Guan-Sheng Liu, George Gardner, George Adly, Min Jiang, Wen-Feng Cai, Chi Keung Lam, Fawzi Alogaili, Nathan Robbins, Jack Rubinstein, Evangelia G Kranias
Heat shock protein 20 (Hsp20) has been shown to be a critical regulator of cardiomyocyte survival upon cardiac stress. In this study, we investigated the functional significance of a novel human Hsp20 mutation (S10F) in peripartum cardiomyopathy. Previous findings showed that cardiac-specific overexpression of this mutant were associated with reduced autophagy, left ventricular dysfunction and early death in male mice. However, this study indicates that females have normal function with no alterations in autophagy but died within a week after 1-4 pregnancies...
May 15, 2018: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/29749377/p2rx7-mapk1-2-sp1-axis-inhibits-mtor-independent-hspb1-mediated-astroglial-autophagy
#7
Ji-Eun Kim, Ah-Reum Ko, Hye-Won Hyun, Su-Ji Min, Tae-Cheon Kang
Recently, we have reported that heat shock protein B1 (HSPB1) and purinergic receptor P2X7 (P2RX7) are involved in astroglial autophagy (clasmatodendrosis), following status epilepticus (SE). However, the underlying mechanisms of astroglial autophagy have not been completely established. In the present study, we found that the lacking of P2rx7 led to prolonged astroglial HSPB1 induction due to impaired mitogen-activated protein kinase 1/2 (MAPK1/2)-mediated specificity protein 1 (SP1) phosphorylation, following kainic acid-induced SE...
May 10, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29596499/specific-protein-carbonylation-in-human-breast-cancer-tissue-compared-to-adjacent-healthy-epithelial-tissue
#8
Baikuntha Aryal, V Ashutosh Rao
Protein carbonylation is an irreversible post-translational modification induced by severe oxidative stress. Reactive oxygen species (ROS) are constantly produced in cells and play important roles in both cancer progression and cancer suppression. ROS levels can be higher in tumor compared to surrounding healthy tissue but ROS-induced specific protein carbonylation and its unique role in cancer progression or suppression is poorly understood. In this study, we utilized previously validated ELISA and western blot methods to analyze the total and specific protein carbonylation in flash-frozen human breast cancer and matched adjacent healthy tissue to compare relative total, and specific protein carbonylation...
2018: PloS One
https://www.readbyqxmd.com/read/29592877/analysis-of-hsp27-and-the-autophagy-marker-lc3b-puncta-following-preoperative-chemotherapy-identifies-high-risk-osteosarcoma-patients
#9
J Andrew Livingston, Wei-Lien Wang, Jen-Wei Tsai, Alexander J Lazar, Cheuk Hong Leung, Heather Lin, Shailesh Advani, Najat Daw, Janice Santiago-O'Farrill, Mario Hollomon, Nancy B Gordon, Eugenie S Kleinerman
Chemotherapy-induced autophagy is a proposed mechanism of chemoresistance and potential therapeutic target in osteosarcoma. We evaluated heat shock protein 27 (HSP27) and autophagy-related proteins as predictors of pathologic treatment response and prognostic markers among osteosarcoma patients who received standard chemotherapy. We analyzed 394 tumor specimens (pre-treatment, post-treatment, and metastases) from 260 osteosarcoma patients by immunohistochemistry for cytoplasmic light chain 3B (LC3B)-positive puncta, sequestosome 1 (SQSTM1), high mobility group box 1 (HMGB1), and HSP27 expression...
March 28, 2018: Molecular Cancer Therapeutics
https://www.readbyqxmd.com/read/29575081/expression-profiling-of-planarians-shed-light-on-a-dual-role-of-programmed-cell-death-during-the-regeneration
#10
Junsong Yuan, Zhihong Wang, Di Zou, Quekun Peng, Rui Peng, Fangdong Zou
Most animals hold the ability to regenerate damaged cells, tissues, and even any lost part of their bodies. To date, there is little known about the precise regulatory mechanism of regeneration and many fundamental questions remain unanswered. To further understand the precise regulatory mechanism of regeneration, we used planarian Dugesia japonica as a model and sequenced the transcriptomes of their regenerated tissues at different regeneration stages. Through de novo assembly and expression profiling, we found that Heat shock protein and MAPK pathway were involved into early response of regeneration in D...
March 25, 2018: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29561705/hsp90-inhibition-targets-autophagy-and-induces-a-casp9-dependent-resistance-mechanism-in-nsclc
#11
Jie Han, Leslie A Goldstein, Wen Hou, Suman Chatterjee, Timothy F Burns, Hannah Rabinowich
Macroautophagy/autophagy has emerged as a resistance mechanism to anticancer drug treatments that induce metabolic stress. Certain tumors, including a subset of KRAS-mutant NSCLCs have been shown to be addicted to autophagy, and potentially vulnerable to autophagy inhibition. Currently, autophagy inhibition is being tested in the clinic as a therapeutic component for tumors that utilize this degradation process as a drug resistance mechanism. The current study provides evidence that HSP90 (heat shock protein 90) inhibition diminishes the expression of ATG7, thereby impeding the cellular capability of mounting an effective autophagic response in NSCLC cells...
March 21, 2018: Autophagy
https://www.readbyqxmd.com/read/29556372/3-epi-12%C3%AE-hydroxyfroside-a-new-cardenolide-induces-cytoprotective-autophagy-via-blocking-the-hsp90-akt-mtor-axis-in-lung-cancer-cells
#12
Yan Sun, Yong-Hao Huang, Feng-Ying Huang, Wen-Li Mei, Quan Liu, Cai-Chun Wang, Ying-Ying Lin, Canhua Huang, Yue-Nan Li, Hao-Fu Dai, Guang-Hong Tan
Rationale: Cardenolides have potential as anticancer drugs. 3'-epi-12β-hydroxyfroside (HyFS) is a new cardenolide structure isolated by our research group, but its molecular mechanisms remain poorly understood. This study investigates the relationship between its antitumor activities and autophagy in lung cancer cells. Methods: Cell growth and proliferation were detected by MTT, lactate dehydrogenase (LDH) release, 5-ethynyl-20-deoxyuridine (EDU) and colony formation assays. Cell apoptosis was detected by flow cytometry...
2018: Theranostics
https://www.readbyqxmd.com/read/29555472/djhsp90s-are-crucial-regulators-during-planarian-regeneration-and-tissue-homeostasis
#13
Zimei Dong, Gengbo Chu, Yingxu Sima, Guangwen Chen
Heat shock protein 90 family members (HSP90s), as molecular chaperones, have conserved roles in the physiological processes of eukaryotes regulating cytoprotection, increasing host resistance and so on. However, whether HSP90s affect regeneration in animals is unclear. Planarians are emerging models for studying regeneration in vivo. Here, the roles of three hsp90 genes from planarian Dugesia japonica are investigated by WISH and RNAi. The results show that: (1) Djhsp90s expressions are induced by heat and cold shock, tissue damage and ionic liquid; (2) Djhsp90s mRNA are mainly distributed each side of the body in intact worms as well as blastemas in regenerative worms; (3) the worms show head regression, lysis, the body curling and the regeneration arrest or even failure after Djhsp90s RNAi; (4) Djhsp90s are involved in autophagy and locomotion of the body...
April 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29555102/exploring-the-multifaceted-roles-of-heat-shock-protein-b8-hspb8-in-diseases
#14
REVIEW
Fazhao Li, Han Xiao, Zhiping Hu, Fangfang Zhou, Binbin Yang
HSPB8 is a member of ubiquitous small heat shock protein (sHSP) family, whose expression is induced in response to a wide variety of unfavorable physiological and environmental conditions. Investigation of HSPB8 structure indicated that HSPB8 belongs to the group of so-called intrinsically disordered proteins and possesses a highly flexible structure. Unlike most other sHSPs, HSPB8 tends to form small-molecular-mass oligomers and exhibits substrate-dependent chaperone activity. In cooperation with BAG3, the chaperone activity of HSPB8 was reported to be involved in the delivery of misfolded proteins to the autophagy machinery...
April 2018: European Journal of Cell Biology
https://www.readbyqxmd.com/read/29553885/acute-heat-stress-changes-protein-expression-in-the-testes-of-a-broiler-type-strain-of-taiwan-country-chickens
#15
Shih-Han Wang, Chuen-Yu Cheng, Chao-Jung Chen, Hong-Lin Chan, Hsin-Hsin Chen, Pin-Chi Tang, Chih-Feng Chen, Yen-Pai Lee, San-Yuan Huang
Heat stress leads to decreased fertility in roosters. This study investigated the global protein expression in response to acute heat stress in the testes of a broiler-type strain of Taiwan country chickens (TCCs). Twelve 45-week-old roosters were randomly allocated to the control group maintained at 25°C, and three groups subjected to acute heat stress at 38°C for 4 h, with 0, 2, and 6 h of recovery, respectively. Testis samples were collected for hematoxylin and eosin staining, apoptosis assay, and protein analysis...
March 19, 2018: Animal Biotechnology
https://www.readbyqxmd.com/read/29541415/sensitization-of-multidrug-resistant-cancer-cells-to-hsp90-inhibitors-by-nsaids-induced-apoptotic-and-autophagic-cell-death
#16
Hyun-Jung Moon, Hak-Bong Kim, Su-Hoon Lee, So-Eun Jeun, Chi-Dug Kang, Sun-Hee Kim
NSAIDs (non-steroidal anti-inflammatory drugs) have potential use as anticancer agents, either alone or in combination with other cancer therapies. We found that NSAIDs including celecoxib (CCB) and ibuprofen (IBU) significantly potentiated the cytotoxicity of Hsp90 inhibitors in human multidrug-resistant (MDR) cells expressing high levels of mutant p53 (mutp53) protein and P-glycoprotein (P-gp), and reversed Hsp90 inhibitor resistance caused by activation of heat shock factor 1 (HSF1) and by up-regulation of heat shock proteins (Hsps) and P-gp...
February 16, 2018: Oncotarget
https://www.readbyqxmd.com/read/29516568/maslinic-acid-induces-autophagy-by-down-regulating-hspa8-in-pancreatic-cancer-cells
#17
Ye Tian, Huanli Xu, Ammad Ahmad Farooq, Baozeng Nie, Xiaoliang Chen, Shuonan Su, Ru Yuan, Gan Qiao, Cong Li, Xiao Li, Xiaohui Liu, Xiukun Lin
Maslinic acid (MA), a natural pentacyclictriterpene, displays cytotoxic activity on various types of cancer cells. However, its underlying mechanism is unclear. In this study, we assessed the effect of MA on autophagy of human pancreatic cancer cells, and the potential autophagic pathway was presented. MA inhibited the proliferation and induced autophagy of Panc-28 cells by altering the expressions of autophagy related proteins. SDS-PAGE analysis revealed that one protein band was significantly down-regulated in cells treated with MA, and the band was identified as heat shock protein HSPA8 as analyzed using Western blot and MS, MS/MS approaches...
March 8, 2018: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/29483524/inhibition-of-heat-shock-proteins-hsp90-and-hsp70-induce-oxidative-stress-suppressing-cotton-fiber-development
#18
Anshulika Sable, Krishan M Rai, Amit Choudhary, Vikash K Yadav, Sudhir K Agarwal, Samir V Sawant
Cotton fiber is a specialized unicellular structure useful for the study of cellular differentiation and development. Heat shock proteins (HSPs) have been shown to be involved in various developmental processes. Microarray data analysis of five Gossypium hirsutum genotypes revealed high transcript levels of GhHSP90 and GhHSP70 genes at different stages of fiber development, indicating their importance in the process. Further, we identified 26 and 55 members of HSP90 and HSP70 gene families in G. hirsutum. The treatment of specific inhibitors novobiocin (Nov; HSP90) and pifithrin/2-phenylethynesulfonamide (Pif; HSP70) in in-vitro cultured ovules resulted in a fewer number of fiber initials and retardation in fiber elongation...
February 26, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29465313/cd5l-is-upregulated-in-hepatocellular-carcinoma-and-promotes-liver-cancer-cell-proliferation-and-antiapoptotic-responses-by-binding-to-hspa5-grp78
#19
Gemma Aran, Lucía Sanjurjo, Cristina Bárcena, Marina Simon-Coma, Érica Téllez, Maria Vázquez-Vitali, Marta Garrido, Laura Guerra, Esther Díaz, Isabel Ojanguren, Felix Elortza, Ramon Planas, Margarita Sala, Carolina Armengol, Maria-Rosa Sarrias
CD5-like (CD5L) is a soluble scavenger cysteine-rich protein that modulates inflammatory responses. We studied the involvement of CD5L in liver cancer. Immunohistochemistry (IHC) of CD5L in 60 hepatocellular carcinomas and 34 adjacent nontumor livers, showed that CD5L staining was higher in tumor than in nontumor tissue (Mann-Whitney test; P = 0.0039). High CD5L correlated with elevated proliferation (Ki67, linear regression; P < 0.0001) and lower patient event-free survival (log-rank; P = 0.0185). Accordingly, CD5L expression was detected in the liver cancer cell lines Huh7, HepG2, and SNU-398...
February 20, 2018: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29461881/insights-into-macrophage-autophagy-in-latent-tuberculosis-infection-role-of-heat-shock-protein-16-3
#20
Caiqin Zhang, Li Yang, Ningning Zhao, Yong Zhao, Changhong Shi
Tuberculosis (TB) is a major bacterial infectious disease worldwide that is predominantly caused by Mycobacterium tuberculosis (Mtb). The comorbidity of multiple drug-resistant TB strains with HIV and diabetes is widespread. In the presence of these diseases, host immunity is weakened, allowing the recovery of dormant bacilli and leading to recurrent TB infection. As an important component of the host innate and adaptive immune responses, macrophage autophagy plays a significant role in protecting the host against TB...
May 2018: DNA and Cell Biology
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