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https://www.readbyqxmd.com/read/29719463/compound-k-induced-apoptosis-via-endoplasmic-reticulum-ca-2-release-through-ryanodine-receptor-in-human-lung-cancer-cells
#1
Dong-Hyun Shin, Dong-Gyu Leem, Ji-Sun Shin, Joo-Il Kim, Kyung-Tack Kim, Sang Yoon Choi, Myung-Hee Lee, Jung-Hye Choi, Kyung-Tae Lee
Background: Extended endoplasmic reticulum (ER) stress may initiate apoptotic pathways in cancer cells, and ER stress has been reported to possibly increase tumor death in cancer therapy. We previously reported that caspase-8 played an important role in compound K-induced apoptosis via activation of caspase-3 directly or indirectly through Bid cleavage, cytochrome c release, and caspase-9 activation in HL-60 human leukemia cells. The mechanisms leading to apoptosis in A549 and SK-MES-1 human lung cancer cells and the role of ER stress have not yet been understood...
April 2018: Journal of Ginseng Research
https://www.readbyqxmd.com/read/29524570/calpeptin-is-neuroprotective-against-acrylamide-induced-neuropathy-in-rats
#2
Benyu Su, Qiangdong Guan, Miaomiao Wang, Ning Liu, Xiaomin Wei, Shue Wang, Xiwei Yang, Wenchong Jiang, Mengmeng Xu, Sufang Yu
The aim of this study is to explore the potent neuroprotective effect of calpeptin (CP) on neuron damage induced by acrylamide (ACR) and its mechanism. Behavioural indicators such as hind limb splay, rota-rod performance, and gait analysis were assessed weekly to evaluate neurobehavioural changes after ACR and/or CP administration. The histopathological alterations and the changes of μ-calpain, m-calpain, microtubule-associated protein 2 (MAP2), and α-tubulin and β-tubulin protein levels in spinal cord were determined...
May 1, 2018: Toxicology
https://www.readbyqxmd.com/read/29507101/mechanistic-role-of-the-calcium-dependent-protease-calpain-in-the-endothelial-dysfunction-induced-by-mpo-myeloperoxidase
#3
Zienab Etwebi, Gavin Landesberg, Kyle Preston, Satoru Eguchi, Rosario Scalia
MPO (myeloperoxidase) is a peroxidase enzyme secreted by activated leukocytes that plays a pathogenic role in cardiovascular disease, mainly by initiating endothelial dysfunction. The molecular mechanisms of the endothelial damaging action of MPO remain though largely elusive. Calpain is a calcium-dependent protease expressed in the vascular wall. Activation of calpains has been implicated in inflammatory disorders of the vasculature. Using endothelial cells and genetically modified mice, this study identifies the µ-calpain isoform as novel downstream signaling target of MPO in endothelial dysfunction...
April 2018: Hypertension
https://www.readbyqxmd.com/read/29425806/hyperactivated-m-calpain-affects-acquisition-of-doxorubicin-resistance-in-breast-cancer-cells
#4
Kyung-Hwa Jeon, Han Vit Yu, Youngjoo Kwon
BACKGROUND: Doxorubicin is commonly using chemotherapeutic agents for breast cancer. However, doxorubicin has limitations in clinical use because of dose-dependent cardiotoxicity and drug resistance. Despite of previously reported studies about mechanisms of doxorubicin resistance including overexpression of P-gp and abnormal expression and mutation of topoisomerase IIα, resistance to this agent still abundantly occur and is regarded as a major obstacle to successful treatment. METHODS: We have established doxorubicin resistant T47D cells...
May 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29339216/in-vivo-biotinylated-calpastatin-improves-the-affinity-purification-of-human-m-calpain
#5
Hung Huy Nguyen, Alexander N Volkov, Guy Vandenbussche, Peter Tompa, Kris Pauwels
Recently we established a novel affinity purification method for calpain by exploiting the specific and reversible binding properties of its intrinsically disordered protein inhibitor, calpastatin. The immobilization strategy relied on the strength and specificity of the biotin - streptavidin interaction. Here, we report an improved and optimized method that even enables the general applicability of in vivo biotinylated (intrinsically disordered) proteins in any affinity capture strategy. Since in vitro chemical biotinylation is only accomplished with reagents that lack exact site specificity, it can not only cause sample heterogeneity but it can also hamper the functionality of the biotinylated molecules...
May 2018: Protein Expression and Purification
https://www.readbyqxmd.com/read/29335338/crth2-promotes-endoplasmic-reticulum-stress-induced-cardiomyocyte-apoptosis-through-m-calpain
#6
Shengkai Zuo, Deping Kong, Chenyao Wang, Jiao Liu, Yuanyang Wang, Qiangyou Wan, Shuai Yan, Jian Zhang, Juan Tang, Qianqian Zhang, Luheng Lyu, Xin Li, Zhixin Shan, Li Qian, Yujun Shen, Ying Yu
Apoptotic death of cardiac myocytes is associated with ischemic heart disease and chemotherapy-induced cardiomyopathy. Chemoattractant receptor-homologous molecule expressed on T helper type 2 cells (CRTH2) is highly expressed in the heart. However, its specific role in ischemic cardiomyopathy is not fully understood. Here, we demonstrated that CRTH2 disruption markedly improved cardiac recovery in mice postmyocardial infarction and doxorubicin challenge by suppressing cardiomyocyte apoptosis. Mechanistically, CRTH2 activation specifically facilitated endoplasmic reticulum (ER) stress-induced cardiomyocyte apoptosis via caspase-12-dependent pathway...
January 15, 2018: EMBO Molecular Medicine
https://www.readbyqxmd.com/read/29300955/evolution-of-proteolytic-indicators-during-storage-of-broiler-wooden-breast-meat
#7
F Soglia, Z Zeng, J Gao, E Puolanne, C Cavani, M Petracci, P Ertbjerg
In the past few yr, an emerging muscle abnormality termed wooden breast (WB) was found to affect broilers' Pectoralis major muscles. Although different studies have been performed in order to evaluate the effect of WB on meat quality, there is no evidence concerning its impact on the proteolytic processes taking place during meat aging. Thus, this study aimed at investigating the effect of a 7-day storage of broiler breast fillets on free calcium concentration, calpain activity, and proteolysis. Both the superficial and the deep layers of the Pectoralis major muscles were considered...
April 1, 2018: Poultry Science
https://www.readbyqxmd.com/read/29289695/calpain-and-jnk-pathways-participate-in-isoflurane-induced-nucleus-translocation-of-apoptosis-inducing-factor-in-the-brain-of-neonatal-rats
#8
Xue Han, Chuiliang Liu, Kun Zhang, Mingyan Guo, Zhiwen Shen, Yafang Liu, Zhiyi Zuo, Minghui Cao, Yujuan Li
Recent studies have demonstrated that volatile anesthetic causes caspase-dependent neuroapoptosis and persistent cognitive deficits in young animals. Apoptosis-inducing factor (AIF) can trigger apoptosis by caspase-independent pathway. Whether isoflurane induces neuroapoptosis by activation of AIF and its possible mechanism are underdetermined. Rats at postnatal day 7 were exposed to 1.1% isoflurane for 4 h and the expression of AIF, cytochrome c, caspase-3, μ-calpain, m-calpain, Bcl-2 and Bax in the mitochondrial, cytosolic, and nuclear fraction, as well as the number of both AIF and TUNEL positive neurons in the cortices of rats were measured...
March 15, 2018: Toxicology Letters
https://www.readbyqxmd.com/read/29274473/tyro3-mediated-phosphorylation-of-actn4-at-tyrosines-is-fak-dependent-and-decreases-susceptibility-to-cleavage-by-m-calpain
#9
Hanshuang Shao, Anna Wang, Douglas Lauffenburger, Alan Wells
Tyro3, a member of TAM receptor tyrosine kinase family, has been implicated in the regulation of melanoma progression and survival. In this study, we sought the molecular mechanism of Tyro3 effects avoiding endogenous background by overexpression of Tyro3 in fibroblasts that have negligible levels of Tyro3. This introduction triggers the tyrosyl-phosphorylation of ACTN4, a member of actin binding protein family involved in motility, a behavior critical for invasive progression, as shown by siRNA to Tyro3 limiting melanoma cell migration and invasion...
February 2018: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/29076275/involvement-of-%C3%AE-m-calpain-in-the-proteolysis-and-meat-quality-changes-during-postmortem-storage-of-chicken-breast-muscle
#10
Liang Zhao, Tong Xing, Jichao Huang, Yan Qiao, Yulian Chen, Ming Huang
The objective of this study was to investigate the role of calpain isotypes, especially poultry-specific μ/m-calpain in the proteolysis and meat quality changes of chicken breast muscle during postmortem storage. Calpain activity was detected by casein zymography, while the degradation of titin, desmin and Troponin-T was analyzed by sodium dodecyl sulfate - polyacrylamide gel electrophoresis and western blot. Meat quality indicators such as water holding capacity and tenderness were also studied. The correlation analysis between calpain activity, proteolysis and the changes in meat quality indicators indicated that there were strong correlations for μ-calpain during the first 12 h of storage, while such strong correlations for μ/m-calpain were only found in samples stored from 12 h to 7 days...
February 2018: Animal Science Journal, Nihon Chikusan Gakkaihō
https://www.readbyqxmd.com/read/28943754/pinus-densiflora-bark-extract-prevents-selenite-induced-cataract-formation-in-the-lens-of-sprague-dawley-rat-pups
#11
Jun Kim, Se-Young Choung
PURPOSE: Rat pups treated with sodium selenite are typically used as an in vivo model to mimic age-related nuclear cataract. Reactive oxygen species (ROS) production, lipid peroxidation, reduction of antioxidant enzymes, crystalline proteolysis, and apoptosis are considered factors that contribute to pathogenesis of age-related nuclear cataract. In the present study, we investigated whether Pinus densiflora bark extract has potential to prevent cataract formation and elucidated the underlying mechanism...
2017: Molecular Vision
https://www.readbyqxmd.com/read/28800153/increased-autolysis-of-%C3%AE-calpain-in-skeletal-muscles-of-chronic-alcohol-fed-rats
#12
Yulia V Gritsyna, Nikolay N Salmov, Alexander G Bobylev, Anna D Ulanova, Nikolay I Kukushkin, Zoya A Podlubnaya, Ivan M Vikhlyantsev
BACKGROUND: Proteolysis can proceed via several distinct pathways such as the lysosomal, calcium-dependent, and ubiquitin-proteasome-dependent pathways. Calpains are the main proteases that cleave a large variety of proteins, including the giant sarcomeric proteins, titin and nebulin. Chronic ethanol feeding for 6 weeks did not affect the activities of μ-calpain and m-calpain in the m. gastrocnemius. In our research, changes in μ-calpain activity were studied in the m. gastrocnemius and m...
August 11, 2017: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/28553344/ca-2-involvement-in-activation-of-extracellular-signal-regulated-kinase-1-2-and-m-calpain-after-axotomy-of-the-sciatic-nerve
#13
Lisa B Mårtensson, Charlotta Lindwall Blom, Lars B Dahlin
Detailed mechanisms behind regeneration after nerve injury, in particular signal transduction and the fate of Schwann cells (SCs), are poorly understood. Here, we investigated axotomy-induced activation of extracellular-signal-regulated kinase-1/2 (ERK1/2; important for proliferation) and m-calpain in vitro, and the relation to Ca(2+) deletion and Schwann cell proliferation and death after rat sciatic nerve axotomy. Nerve segments were cultured for up to 72 hours with and without ethylene glycol-bis(β-aminoethyl ether)-N, N, N', N'-tetraacetic acid (EGTA)...
April 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/28446133/prevention-and-reversal-of-selenite-induced-cataracts-by-n-acetylcysteine-amide-in-wistar-rats
#14
Yasaswi Maddirala, Shakila Tobwala, Humeyra Karacal, Nuran Ercal
BACKGROUND: The present study sought to evaluate the efficacy of N-acetylcysteine amide (NACA) eye drops in reversing the cataract formation induced by sodium selenite in male Wistar rat pups. METHODS: Forty male Wistar rat pups were randomly divided into a control group, an N-acetylcysteine amide-only group, a sodium selenite-induced cataract group, and a NACA-treated sodium selenite-induced cataract group. Sodium selenite was injected intraperitoneally on postpartum day 10, whereas N-acetylcysteine amide was injected intraperitoneally on postpartum days 9, 11, and 13 in the respective groups...
April 26, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28319173/affinity-purification-of-human-m-calpain-through-an-intrinsically-disordered-inhibitor-calpastatin
#15
Hung Huy Nguyen, Mihaly Varadi, Peter Tompa, Kris Pauwels
Calpains are calcium-activated proteases that have biomedical and biotechnological potential. Their activity is tightly regulated by their endogenous inhibitor, calpastatin that binds to the enzyme only in the presence of calcium. Conventional approaches to purify calpain comprise multiple chromatographic steps, and are labor-intensive, leading to low yields. Here we report a new purification procedure for the human m-calpain based on its reversible calcium-mediated interaction with the intrinsically disordered calpastatin...
2017: PloS One
https://www.readbyqxmd.com/read/28038429/amd3100-combined-with-triptolide-inhibit-proliferation-invasion-and-metastasis-and-induce-apoptosis-of-human-u2os-osteosarcoma-cells
#16
Chunming Jiang, Xiang Fang, Hongxu Zhang, Xuepeng Wang, Maoqiang Li, Wu Jiang, Fei Tian, Liulong Zhu, Zhenyu Bian
BACKGROUND: Osteosarcoma (OS) mainly occurs in children and adolescents, and has a high propensity for lung metastasis. Little is known about the role of SDF-1/CXCR4 axis in OS progression. AMD3100 is a specific CXCR4 antagonist. Triptolide can induce apoptosis and proliferation inhibition in various cancer cell lines. OBJECTIVE: This work aimed to investigate the effects of AMD3100 plus triptolide on the proliferation, apoptosis, invasion and metastasis of OS cells...
February 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27835610/roles-of-calpain-calpastatin-system-ccs-in-human-t-cell-activation
#17
Anna Mikosik, Aleksandra Jasiulewicz, Agnieszka Daca, Izabella Henc, Joanna E Frąckowiak, Katarzyna Ruckemann-Dziurdzińska, Jerzy Foerster, Aurelie Le Page, Ewa Bryl, Tamas Fulop, Jacek M Witkowski
The immune response is determined by the speed of the T cell reaction to antigens assured by a state of readiness for proliferation and cytokine secretion. Proliferation, apoptosis and motion of many cell types are controlled by cytoplasmic proteases - µ- and m-calpain - and their inhibitor calpastatin, together forming the "calpain-calpastatin system" (CCS), assumed to modify their targets only upon activation-dependent cytoplasmic Ca2+ increase. Contrastingly to this notion, using quantitative real time PCR and semiquantitative flow cytometry respectively, we show here that the CCS genes are constitutively expressed, and that both calpains are constitutively active in resting, circulating human CD4+ and CD8+ lymphocytes...
November 22, 2016: Oncotarget
https://www.readbyqxmd.com/read/27693494/bradykinin-promotes-migration-and-invasion-of-hepatocellular-carcinoma-cells-through-trpm7-and-mmp2
#18
Yijie Chen, Yang Yu, Shuya Sun, Zhaotong Wang, Peiqing Liu, Shenglan Liu, Jianmin Jiang
Tumor metastasis is the main reason of death for hepatocellular carcinoma (HCC) patients. Cell migration and invasion are two prerequisites for tumor metastasis, in which TRPM7 and MMPs play an important role. In our study, we found that bradykinin (BK) could upregulate the expression of TRPM7 and dynamically regulate the phosphorylation of non-muscle myosin IIA heavy chain (NMHC-IIA) Ser-1943 in HepG2 cells. The influx of Ca(2+) via TRPM7 was necessary for elevating the activity of m-calpain and μ-calpain...
November 15, 2016: Experimental Cell Research
https://www.readbyqxmd.com/read/27433017/effect-of-fast-ph-decline-during-the-early-postmortem-period-on-calpain-activity-and-cytoskeletal-protein-degradation-of-broiler-m-pectoralis-major
#19
J C Huang, J Yang, F Huang, M Huang, K J Chen, X L Xu, G H Zhou
The objective of this study was to determine the effects of fast pH decline during the early postmortem period on calpain activity and the degradation of cytoskeletal proteins in broilers. Eighty broilers were randomly categorized into two groups: physical restraint (PR) and free struggle (FS). M. pectoralis major (PM) was used for determination of calpain activity, shear value, ultrastructure of myofibrils, and the degradation of desmin, titin, nebulin, and troponin-T. The pH (6.05) of FS group is significantly low than PR group (6...
October 1, 2016: Poultry Science
https://www.readbyqxmd.com/read/27206501/activities-of-proteasome-and-m-calpain-are-essential-for-chikungunya-virus-replication
#20
Yogesh A Karpe, Kunal D Pingale, Gayatri D Kanade
Replication of many viruses is dependent on the ubiquitin proteasome system. The present study demonstrates that Chikungunya virus replication increases proteasome activity and induces unfolded protein response (UPR) in cultured cells. Further, it was seen that the virus replication was dependent on the activities of proteasomes and m-calpain. Proteasome inhibition induced accumulation of polyubiquitinated proteins and earlier visualization of UPR.
October 2016: Virus Genes
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