Exposure to aflatoxin B1 in late gestation alters protein kinase C and apoptotic protein expression in murine placenta

2016 ◽  
Vol 61 ◽  
pp. 68-74 ◽  
Author(s):  
Yanfei Wang ◽  
Wenjuan Tan ◽  
C.C. Wang ◽  
Lai K. Leung
Keyword(s):  
Protein Kinase C ◽  
Protein Kinase ◽  
Protein Expression ◽  
Aflatoxin B1 ◽  
Late Gestation ◽  
Kinase C ◽  
Apoptotic Protein

scholarly journals Dysregulation of protein kinase C in adult depression and suicide: evidence from postmortem brain studies

2021 ◽  
Author(s):  
Ghanshyam N Pandey ◽  
Anuradha Sharma ◽  
Hooriyah S Rizavi ◽  
Xinguo Ren
Keyword(s):  
Protein Kinase C ◽  
Protein Kinase ◽  
Protein Expression ◽  
Mrna Expression ◽  
Postmortem Brain ◽  
Cortical Region ◽  
Cytosol Fraction ◽  
Kinase C ◽  
Pkc Isozymes

Abstract Background Several lines of evidence suggest the abnormalities of protein kinase C (PKC) signaling system in mood disorders and suicide based primarily on the studies of PKC and its isozymes in the platelets and postmortem brain of depressed and suicidal subjects. In this study we examined the role of PKC isozymes in depression and suicide. Methods We determined the protein and mRNA expression of various PKC isozymes in the prefrontal cortical region [Brodmann area 9 (BA9)] in 24 normal control (NC) subjects, 24 depressed suicide (DS) subjects and 12 depressed non-suicide (DNS) subjects. The levels of mRNA in the prefrontal cortex (PFC) were determined by qRT-PCR and the protein expression was determined by Western blotting. Results We observed a significant decrease in mRNA expression of PKCα, PKCβI, PKCδ and PKCε and decreased protein expression either in the membrane or the cytosol fraction of PKC isozymes - PKCα, PKCβI, PKCβII and PKCδ in DS and DNS subjects compared with NC subjects. Conclusions The current study provides detailed evidence of specific dysregulation of certain PKC isozymes in the postmortem brain of DS and DNS subjects and further supports earlier evidence for the role of PKC in the platelets and brain of adult and teenage depressed and suicidal population. This comprehensive study may lead to further knowledge of the involvement of PKC in the pathophysiology of depression and suicide.

scholarly journals Protein kinase C isozymes; predictors of progression free survival in NSCLC patients

2019 ◽  
Author(s):  
Ann Rita Halvorsen ◽  
Mads Haugland Haugen ◽  
Åsa Kristina Öjlert ◽  
Marius Lund-Iversen ◽  
Lars Jørgensen ◽  
...  
Keyword(s):  
Protein Kinase C ◽  
Protein Kinase ◽  
Protein Expression ◽  
Molecular Subtypes ◽  
Progression Free Survival ◽  
Free Survival ◽  
Kinase C ◽  
Pkc Isozymes ◽  
Pkc Β ◽  
Low Expression

Abstract Background Protein expression is deregulated in cancer, and the proteomic changes observed in lung cancer may be a consequence of mutations in essential genes. The purpose of this study was to identify protein expression associated with prognosis in lung cancers stratified by smoking status, molecular subtypes, and EGFR-, TP53- and KRAS-mutations. Methods We performed profiling of 295 cancer-relevant phosphorylated and non-phosphorylated proteins, using reverse phase protein arrays. Biopsies from 80 patients with operable lung adenocarcinomas were analyzed for protein expression and association with progression free survival (PFS) were studied. Results Spearman rank correlation analysis identified 56 proteins with significant association to PFS (p<0.05). High expression of protein kinase C (PKC)-α and the phosporylated state of PKC-α, PKC-β and PKC-δ, showed the strongest positive correlation to PFS, especially in the wild type samples. This was confirmed in gene expression data from 186 samples. Based on protein expression, unsupervised hierarchical clustering separated the samples into four subclusters enriched with the molecular subtypes TRU, PI or PP (p=0.0001). Subcluster 2 contained a smaller cluster (2a) enriched with samples of the subtype PP, low expression of the PKC isozymes, and associated with poor PFS (p=0.003) compared to the other samples. Subcluster 2a revealed increased expression of neuroendocrine markers, supporting the aggressive behavior. Low expression of the PKC isozymes in the subtype PP and a reduced relapse free survival was confirmed with the TCGA LUAD samples. Conclusion This study identified different proteins associated with PFS depending on molecular subtype, smoking- and mutational-status, with PKC-α, PKC-β and PKC-δ showing the strongest correlation. Cluster analysis detected a subgroup of samples enriched for samples of the PP subtype and poor PFS, which may benefit from a more aggressive treatment regimen.

Aflatoxin B1 reduces non-enzymatic antioxidant defenses and increases protein kinase C activation in the cerebral cortex of young rats

2017 ◽  
Vol 21 (4) ◽  
pp. 268-275 ◽  
Author(s):  
Naiéli Schiefelbein Souto ◽  
Ana Claudia Monteiro Braga ◽  
Mayara Lutchemeyer de Freitas ◽  
Michele Rechia Fighera ◽  
Luiz Fernando Freire Royes ◽  
...  
Keyword(s):  
Cerebral Cortex ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Aflatoxin B1 ◽  
Antioxidant Defenses ◽  
Enzymatic Antioxidant ◽  
Young Rats ◽  
Kinase C ◽  
Protein Kinase C Activation

PKCε activation induces dichotomous cardiac phenotypes and modulates PKCε-RACK interactions and RACK expression

2001 ◽  
Vol 280 (3) ◽  
pp. H946-H955 ◽  
Author(s):  
Jason M. Pass ◽  
Yuting Zheng ◽  
William B. Wead ◽  
Jun Zhang ◽  
Richard C. X. Li ◽  
...  
Keyword(s):  
Protein Kinase C ◽  
Protein Kinase ◽  
Protein Expression ◽  
Protein Interactions ◽  
Dominant Negative ◽  
The Other ◽  
Protein Protein Interactions ◽  
Kinase C ◽  
Transgenic Lines ◽  
Pkc Activation

Receptors for activated C kinase (RACKs) have been shown to facilitate activation of protein kinase C (PKC). However, it is unknown whether PKC activation modulates RACK protein expression and PKC-RACK interactions. This issue was studied in two PKCε transgenic lines exhibiting dichotomous cardiac phenotypes: one exhibits increased resistance to myocardial ischemia (cardioprotected phenotype) induced by a modest increase in PKCε activity (228 ± 23% of control), whereas the other exhibits cardiac hypertrophy and failure (hypertrophied phenotype) induced by a marked increase in PKCε activity (452 ± 28% of control). Our data demonstrate that activation of PKC modulates the expression of RACK isotypes and PKC-RACK interactions in a PKCε activity- and dosage-dependent fashion. We found that, in mice displaying the cardioprotected phenotype, activation of PKCε enhanced RACK2 expression (178 ± 13% of control) and particulate PKCε-RACK2 protein-protein interactions (178 ± 18% of control). In contrast, in mice displaying the hypertrophied phenotype, there was not only an increase in RACK2 expression (330 ± 33% of control) and particulate PKCε-RACK2 interactions (154 ± 14% of control) but also in RACK1 protein expression (174 ± 10% of control). Most notably, PKCε-RACK1 interactions were identified in this line. With the use of transgenic mice expressing a dominant negative PKCε, we found that the changes in RACK expression as well as the attending cardiac phenotypes were dependent on PKCε activity. Our observations demonstrate that RACK expression is dynamically regulated by PKCε and suggest that differential patterns of PKCε-RACK interactions may be important determinants of PKCε-dependent cardiac phenotypes.

α1-Adrenoceptor-Gq-RhoA signaling is upregulated to increase myofibrillar Ca2+ sensitivity in failing hearts

2001 ◽  
Vol 281 (2) ◽  
pp. H637-H646 ◽  
Author(s):  
Nobuhiro Suematsu ◽  
Shinji Satoh ◽  
Shintaro Kinugawa ◽  
Hiroyuki Tsutsui ◽  
Shunji Hayashidani ◽  
...  
Keyword(s):  
Protein Kinase C ◽  
Protein Kinase ◽  
Protein Expression ◽  
Light Chain ◽  
Myosin Light Chain ◽  
Kinase Inhibitor ◽  
Rho Kinase ◽  
Adrenergic Stimulation ◽  
Regulatory Myosin Light Chain ◽  
Kinase C

α1-Adrenergic stimulation, coupled to Gq, has been shown to promote heart failure. However, the role of α1-adrenergic signaling in the regulation of myocardial contractility in failing myocardium is still poorly understood. To investigate this, we observed 1) the effect of phenylephrine on myofibrillar Ca2+ sensitivity in α-toxin-skinned cardiomyocytes, and 2) protein expression of Gq, RhoA, and myosin light chain phosphorylation using tachypacing-induced canine failing hearts. Phenylephrine significantly increased myofibrillar Ca2+ sensitivity in failing but not in normal cardiomyocytes. Whereas Y-27632 (Rho kinase inhibitor) blocked the phenylephrine-induced Ca2+ sensitization in the failing myocytes, calphostin C (protein kinase C inhibitor) had no effect on Ca2+ sensitization. The protein expression of Gαq and RhoA and the phosphorylation level of regulatory myosin light chain significantly increased in the failing myocardium. Our results suggest that α1-adrenoceptor-Gq signaling is upregulated in the failing myocardium to increase the myofibrillar Ca2+sensitivity mainly through the RhoA-Rho kinase pathway rather than through the protein kinase C pathway.

scholarly journals Role of Protein Kinase C in the Expression of Endothelin Converting Enzyme-1

Endocrinology ◽  
2008 ◽  
Vol 150 (3) ◽  
pp. 1440-1449 ◽  
Author(s):  
Mogher Khamaisi ◽  
Rachel Dahan ◽  
Saher Hamed ◽  
Zaid Abassi ◽  
Samuel N. Heyman ◽  
...  
Keyword(s):  
Protein Kinase C ◽  
Protein Kinase ◽  
Protein Expression ◽  
High Glucose ◽  
Molecular Mechanisms ◽  
Converting Enzyme ◽  
Endothelin 1 ◽  
Kinase C ◽  
Endothelin Converting Enzyme ◽  
Related Increase

Increased expression of endothelin converting enzyme-1 (ECE-1) is associated with diabetic nephropathy. The molecular mechanisms underlying this association, as yet unknown, possibly involve protein kinase C (PKC) pathways. In the present study, we examined the effects of high glucose and PKC activation on ECE-1 expression in primary human umbilical vein endothelial cells (HUVECs) and in HUVEC line (EA.hy926). Increasing glucose concentration, but not mannitol, from 5.5–22.2 mmol/liter for 3 d, enhanced prepro endothelin-1 (ET-1) mRNA expression, ET-1 levels, ECE-1 protein, and mRNA expressions by 7, 4, 20, and 2.6-fold, respectively. High glucose increased ECE-1 protein expression dose and time dependently. By Western blot analysis, PKC-β1, -β2, and -δ isoform levels were significantly increased relative to other isoforms when glucose level was increased. Treatment with Rottlerin, a PKC-δ isoform inhibitor, reduced significantly the glucose-induced ET-1 secretion, and ECE-1 protein expression, but (S)-13-[(dimethylamino)methyl]-10,11,14,15-tetrahydro-4,9:16,21-dimetheno 1H,13H-dibenzo[e,k]pyrrolo[3,4-h] (1, 4, 3) oxadiaza-cyclohexadecene-1,3(2H)-dione or Gö6976, specific PKC-β and -α inhibitors, respectively, did not. Overexpression of PKC-δ but not PKC-α or -β1 isoforms by adenovirus vector containing the respective cDNA in HUVECs incubated with 5.5 mmol/liter glucose, increased in parallel PKC proteins, and glucose-induced endothein-1 and ECE-1 protein expression by 4- to 6-fold. These results show that enhanced ECE-1 expression induced by hyperglycemia is partly due to activation of the PKC-δ isoform. Thus, inhibition of this PKC isoform may prevent diabetes-related increase in ET-1. Hyperglycemia-induced enhanced endothelin converting enzyme-1 expression is mediated by PKC-δ. Inhibition of this PKC isoform may prevent diabetes-related increase in endothelin-1.

scholarly journals Effects of Renal Ischemic Postconditioning on Myocardial Ultrastructural Organization and Myocardial Expression of Bcl-2/Bax in Rabbits

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Wen-zhong Zhang ◽  
Rong Li ◽  
Song Liu ◽  
Ji-dong Zhang ◽  
Xian-feng Ning ◽  
...  
Keyword(s):  
Protein Kinase C ◽  
Coronary Artery ◽  
Protein Kinase ◽  
Protein Expression ◽  
Ischemia Reperfusion ◽  
Ischemic Postconditioning ◽  
The Other ◽  
Ultrastructural Organization ◽  
Bax Protein ◽  
Kinase C

We investigated the cardioprotective effect of renal ischemic postconditioning (RI-PostC) and its mechanisms in a rabbit model. Rabbits underwent 60 min of left anterior descending coronary artery occlusion (LADO) and 6 h of reperfusion. The ischemia-reperfusion (IR) group underwent LADO and reperfusion only. In the RI-PostC group, the left renal artery underwent 3 cycles of occlusion for 30 seconds and release for 30 seconds, before the coronary artery was reperfused. In the RI-PostC + GF109203X group, the rabbits received 0.05 mg/kg GF109203X (protein kinase C inhibitor) intravenously for 10 min followed by RI-PostC. Light microscopy and electron microscopy demonstrated that the RI-PostC group showed less pronounced changes, a smaller infarct region, and less apoptosis than the other two groups. Bcl-2 and Bax protein expression did not differ between the IR and RI-PostC + GF109203X groups. However, in the RI-PostC group, Bcl-2 protein expression was significantly higher and Bax protein expression was significantly lower than in the other two groups (P<0.05). Changes in heart rate and mean arterial pressure were also smaller in the RI-PostC group than in the other two groups. These results indicate that RI-PostC can ameliorate myocardial ischemia-reperfusion injury and increase the Bcl-2/Bax ratio through a mechanism involving protein kinase C.

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