scholarly journals Targeting Protein Kinase C in Glioblastoma Treatment

Biomedicines ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 381
Author(s):  
Noelia Geribaldi-Doldán ◽  
Irati Hervás-Corpión ◽  
Ricardo Gómez-Oliva ◽  
Samuel Domínguez-García ◽  
Félix A. Ruiz ◽  
...  
Keyword(s):  
Stem Cells ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Combined Treatment ◽  
Primary Brain Tumor ◽  
Kinase C ◽  
Pkc Isozymes ◽  
New Generation ◽  
Effective Drugs

Glioblastoma (GBM) is the most frequent and aggressive primary brain tumor and is associated with a poor prognosis. Despite the use of combined treatment approaches, recurrence is almost inevitable and survival longer than 14 or 15 months after diagnosis is low. It is therefore necessary to identify new therapeutic targets to fight GBM progression and recurrence. Some publications have pointed out the role of glioma stem cells (GSCs) as the origin of GBM. These cells, with characteristics of neural stem cells (NSC) present in physiological neurogenic niches, have been proposed as being responsible for the high resistance of GBM to current treatments such as temozolomide (TMZ). The protein Kinase C (PKC) family members play an essential role in transducing signals related with cell cycle entrance, differentiation and apoptosis in NSC and participate in distinct signaling cascades that determine NSC and GSC dynamics. Thus, PKC could be a suitable druggable target to treat recurrent GBM. Clinical trials have tested the efficacy of PKCβ inhibitors, and preclinical studies have focused on other PKC isozymes. Here, we discuss the idea that other PKC isozymes may also be involved in GBM progression and that the development of a new generation of effective drugs should consider the balance between the activation of different PKC subtypes.

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.

Protein kinase C regulates endocytosis and recycling of E-cadherin

2002 ◽  
Vol 283 (2) ◽  
pp. C489-C499 ◽  
Author(s):  
Tam Luan Le ◽  
Shannon R. Joseph ◽  
Alpha S. Yap ◽  
Jennifer L. Stow
Keyword(s):  
Protein Kinase C ◽  
Protein Kinase ◽  
Phorbol Esters ◽  
Recycling Endosomes ◽  
Kinase C ◽  
Pkc Isozymes ◽  
Pkc Activation ◽  
Darby Canine Kidney ◽  
E Cadherin

E-cadherin is a major component of adherens junctions in epithelial cells. We showed previously that a pool of cell surface E-cadherin is constitutively internalized and recycled back to the surface. In the present study, we investigated the potential role of protein kinase C (PKC) in regulating the trafficking of surface E-cadherin in Madin-Darby canine kidney cells. Using surface biotinylation and immunofluorescence, we found that treatment of cells with phorbol esters increased the rate of endocytosis of E-cadherin, resulting in accumulation of E-cadherin in apically localized early or recycling endosomes. The recycling of E-cadherin back to the surface was also decreased in the presence of phorbol esters. Phorbol ester-induced endocytosis of E-cadherin was blocked by specific inhibitors, implicating novel PKC isozymes, such as PKC-ε in this pathway. PKC activation led to changes in the actin cytoskeleton facilitating E-cadherin endocytosis. Depolymerization of actin increased endocytosis of E-cadherin, whereas the PKC-induced uptake of E-cadherin was blocked by the actin stabilizer jasplakinolide. Our findings show that PKC regulates vital steps of E-cadherin trafficking, its endocytosis, and its recycling.

scholarly journals Conventional protein kinase C in the brain: repurposing cancer drugs for neurodegenerative treatment?

2021 ◽  
Author(s):  
Gema Lorden Losada ◽  
Alexandra C Newton
Keyword(s):  
Protein Kinase C ◽  
Protein Kinase ◽  
Spinocerebellar Ataxia Type ◽  
Membrane Phospholipids ◽  
Brain Physiology ◽  
Kinase C ◽  
Pkc Isozymes ◽  
Hydrolysis Of ◽  
The Brain

Protein Kinase C (PKC) isozymes are tightly regulated kinases that transduce a myriad of signals from receptor-mediated hydrolysis of membrane phospholipids. They play an important role in brain physiology, and dysregulation of PKC activity is associated with neurodegeneration. Gain-of-function mutations in PKCα are associated with Alzheimer’s disease and mutations in PKCγ cause spinocerebellar ataxia type 14. This article presents an overview of the role of the conventional PKCα and PKCγ in neurodegeneration and proposes repurposing PKC inhibitors, which failed in clinical trials for cancer, for the treatment of neurodegenerative diseases.

scholarly journals Conventional protein kinase C in the brain: 40 years later

2017 ◽  
Vol 1 (2) ◽  
Author(s):  
Julia A. Callender ◽  
Alexandra C. Newton
Keyword(s):  
Cell Death ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Loss Of Function ◽  
Membrane Phospholipids ◽  
Kinase C ◽  
Pkc Isozymes ◽  
Hydrolysis Of ◽  
The Brain

Protein kinase C (PKC) is a family of enzymes whose members transduce a large variety of cellular signals instigated by the receptor-mediated hydrolysis of membrane phospholipids. While PKC has been widely implicated in the pathology of diseases affecting all areas of physiology including cancer, diabetes, and heart disease—it was discovered, and initially characterized, in the brain. PKC plays a key role in controlling the balance between cell survival and cell death. Its loss of function is generally associated with cancer, whereas its enhanced activity is associated with neurodegeneration. This review presents an overview of signaling by diacylglycerol (DG)-dependent PKC isozymes in the brain, and focuses on the role of the Ca2+-sensitive conventional PKC isozymes in neurodegeneration.

scholarly journals The Enigmatic Protein Kinase C-eta

Cancers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 214 ◽  
Author(s):  
Alakananda Basu
Keyword(s):  
Protein Kinase C ◽  
Protein Kinase ◽  
Myeloid Leukemia ◽  
Review Article ◽  
Tumor Formation ◽  
Small Cell Lung ◽  
Cellular Processes ◽  
Kinase C ◽  
Pkc Isozymes

Protein kinase C (PKC), a multi-gene family, plays critical roles in signal transduction and cell regulation. Protein kinase C-eta (PKCη) is a unique member of the PKC family since its regulation is distinct from other PKC isozymes. PKCη was shown to regulate cell proliferation, differentiation and cell death. It was also shown to contribute to chemoresistance in several cancers. PKCη has been associated with several cancers, including renal cell carcinoma, glioblastoma, breast cancer, non-small cell lung cancer, and acute myeloid leukemia. However, mice lacking PKCη were more susceptible to tumor formation in a two-stage carcinogenesis model, and it is downregulated in hepatocellular carcinoma. Thus, the role of PKCη in cancer remains controversial. The purpose of this review article is to discuss how PKCη regulates various cellular processes that may contribute to its contrasting roles in cancer.

Role of protein kinase C in the regulation of steroidogenesis in the mouse Leydig cell

1986 ◽  
Vol 113 (1_Suppl) ◽  
pp. S63-S64
Author(s):  
A. K. MUKHOPADHYAY ◽  
H. G. BOHNET
Keyword(s):  
Protein Kinase C ◽  
Protein Kinase ◽  
Leydig Cell ◽  
Kinase C ◽  
Mouse Leydig Cell

scholarly journals Role of cadmium in activating nuclear protein kinase C and the enzyme binding to nuclear protein.

1992 ◽  
Vol 267 (28) ◽  
pp. 19824-19828
Author(s):  
C Block ◽  
S Freyermuth ◽  
D Beyersmann ◽  
A.N. Malviya
Keyword(s):  
Protein Kinase C ◽  
Protein Kinase ◽  
Nuclear Protein ◽  
Enzyme Binding ◽  
Kinase C
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