34 results match your criteria pkc-ɛ pkc-η

Intrathecal TRPM8 blocking attenuates cold hyperalgesia via PKC and NF-κB signaling in the dorsal root ganglion of rats with neuropathic pain.

J Pain Res 2019 18;12:1287-1296. Epub 2019 Apr 18.

Department of Pain Medicine, Affiliated Hospital of Zunyi Medical University, Zunyi 563000, People's Republic of China.

TRPM8 channel plays central roles in the sensitization of nociceptive transduction and is thought as one of the potential targets for the treatment of neuropathic pain. However, the specific molecular mechanisms are still less clear. Sciatic chronic constriction injury (CCI) rats were intrathecally administered with AMTB (TRPM8-selective antagonist) or PDTC (nuclear factor-kappa B (NF-κB) inhibitor). Read More

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Regulatory phosphorylation of FXYD2 by PKC and cross interactions between FXYD2, plasmalemmal Ca-ATPase and Na,K-ATPase.

Arch Biochem Biophys 2011 Jan 24;505(1):75-82. Epub 2010 Sep 24.

Laboratório de Estrutura e Regulação de Proteínas e ATPases, Instituto de Bioquímica Médica, Universidade Federal do Rio de Janeiro, Brazil.

FXYD2 is a regulatory peptide associated with the α-subunit of the kidney Na,K-ATPase. FXYD2 can be phosphorylated by PKA, and its phosphorylation activates Na,K-ATPase. Here we show that FXYD2 is phosphorylated by PKC (PKC-FXYD2-P), by PKA (PKA-FXYD2-P) or by PKA and PKC simultaneously (FXYD2-P(2)) modulating both the erythrocyte Na,K-ATPase and the plasma membrane Ca(2+)-ATPase (PMCA). Read More

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January 2011

PKC-permitted elevation of sarcolemmal KATP concentration may explain female-specific resistance to myocardial infarction.

J Physiol 2009 Dec 5;587(Pt 23):5723-37. Epub 2009 Oct 5.

University of Colorado at Boulder, 354 UCB, Boulder, CO 80309-0354, USA.

The female myocardium, relative to that of the male, exhibits sustained resistance to ischaemic tissue injury, a phenomenon termed sex-specific cardioprotection (SSC). SSC is dependent upon the sarcolemmal K(ATP) channel (sarcK(ATP)), and protein kinase C (PKC). Here we investigate whether PKC-mediated regulation of sarcK(ATP) concentration can explain this endogenous form of protection. Read More

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December 2009

Rescue of atypical protein kinase C in epithelia by the cytoskeleton and Hsp70 family chaperones.

J Cell Sci 2009 Jul 23;122(Pt 14):2491-503. Epub 2009 Jun 23.

Department of Cell Biology and Anatomy, University of Miami Miller School of Medicine, Miami, FL 33136, USA.

Atypical PKC (PKC iota) is a key organizer of cellular asymmetry. Sequential extractions of intestinal cells showed a pool of enzymatically active PKC iota and the chaperone Hsp70.1 attached to the apical cytoskeleton. Read More

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The angiotensin receptor type 1-Gq protein-phosphatidyl inositol phospholipase Cbeta-protein kinase C pathway is involved in activation of proximal tubule Na+-ATPase activity by angiotensin(1-7) in pig kidneys.

Exp Physiol 2008 May 1;93(5):639-47. Epub 2008 Feb 1.

Departamento de Farmacologia Básica e Clínica, Instituto de Ciências Biomédicas, Brazil.

In a previous study, we observed that angiotensin(1-7) (Ang(1-7)) stimulates proximal tubule Na+-ATPase activity through the angiotensin receptor type 1 (AT1R). Here we aimed to study the signalling pathways involved. Our results show that the stimulatory effect of Ang(1-7) on Na+-ATPase activity through AT1R involves a Gq protein-phosphatidyl inositol-phospholipase Cbeta (PI-PLCbeta) pathway because: (1) the effect was reversed by GDPbetaS, a non-hydrolysable GDP analogue, and by a monoclonal Gq protein antibody; (2) the effect was similar and not additive to that of GTPgammaS, a non-hydrolysable GTP analogue; (3) Ang(1-7) induced a rapid decrease (30 s) in phosphatidylinositol 4,5-bisphosphate levels, a PI-PLCbeta substrate; and (4) U73122, a specific inhibitor of PI-PLCbeta, abolished Ang(1-7)-induced stimulation of Na+-ATPase activity. Read More

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Immunological actions of Sophy beta-glucan (beta-1,3-1,6 glucan), currently available commercially as a health food supplement.

Microbiol Immunol 2007 ;51(9):861-73

Kyushu University of Health and Welfare School of Health Science, and Institute of Immunology, Takahashi Educational Institute, Nobeoka, Miyazaki, Japan.

We examined the immunological actions of Sophy beta-glucan(Ikewaki N., et al. United States Patent 6956120 and Japan Patent 2004-329077), a type of beta-1,3-1,6 glucan produced by the black yeast Aureobasidium pullulans (A. Read More

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February 2008

Analysis of functional signaling domains from fluorescence imaging and the two-dimensional continuous wavelet transform.

Biophys J 2007 Oct 22;93(8):2900-10. Epub 2007 Jun 22.

Department of Pharmaceutical Sciences, University at Buffalo, State University of New York, Buffalo, New York, USA.

A technique that utilizes the one-dimensional (1D) continuous wavelet transform (CWT) of linearized fluorescence resonance energy transfer (FRET) microscopic images has been extended to identify signaling macro- and microdomains in cell plasma membranes by incorporating the two-dimensional (2D) CWT of time-lapse fluorescence and/or FRET images. Signaling domains were identified from differences in wavelet coefficient matrices, and there was good agreement between the 1D and 2D methods on examining a), static fluorescent images of COS1 cells expressing calmodulin kinase II fused with enhanced yellow fluorescent protein, and b), time lapse FRET images of reporters of protein kinase C (PKC) (PKC activity reporter) and adenylyl cyclase dynamics (cAMP) activity within COS1 plasma membrane confines after stimulation by phorbol-12,13-dibutyrate or forskolin, respectively. The proposed 2D wavelet-based image analysis effectively detected phosphorylation/dephosphorylation signaling microdomains (PKC) as well as those reflective of cAMP without the limitation of requiring linearized signals imposed by the 1D approach. Read More

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October 2007

Characterization of the interaction of hypericin with protein kinase C in U-87 MG human glioma cells.

Photochem Photobiol 2006 May-Jun;82(3):720-8

Department of Biophysics, University of PJ Safarik, Kosice, Slovak Republic.

A fluorescence imaging technique was used to monitor intracellular localization of protein kinase C (PKC) in U-87 MG human glioma cells in the presence of hypericin (Hyp) and phorbol 12-myristate-13-acetate (PMA). It is shown that PKC localization, which reflects its activity, is influenced by Hyp and this influence is different from that observed for PMA which acts as PKC activator. Fluorescence binding experiments were used to determine the binding constants of Hyp to several isoforms of PKC. Read More

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Alterations in protein kinase A and different protein kinase C isoforms in the heart during morphine withdrawal.

Eur J Pharmacol 2005 Oct 3;522(1-3):9-19. Epub 2005 Oct 3.

Equip of Cellular and Molecular Pharmacology, University School of Medicine, Murcia, Spain.

The present study was designed to investigate the possible changes of protein kinase A (PKA) and different isoforms of protein kinase C (PKC): PKC alpha, PKC delta and PKC zeta after naloxone induced morphine withdrawal in the heart. Male rats were implanted with placebo (naïve) or morphine (tolerant/dependent) pellets for 7 days. On day 8 rats received saline s. Read More

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October 2005

Deoxycholic acid activates protein kinase C and phospholipase C via increased Ca2+ entry at plasma membrane.

Gastroenterology 2005 Mar;128(3):695-707

Boston VA Healthcare System and the Department of Surgery, Harvard Medical School, Brigham and Women's Hospital, 1400 VFW Parkway, West Roxbury, Massachusetts 02132, USA.

Background & Aims: Secondary bile acids like deoxycholic acid (DCA) are well-established tumor promoters that may exert their pathologic actions by interfering with intracellular signaling cascades.

Methods: We evaluated the effects of DCA on Ca2+ signaling in BHK-21 fibroblasts using fura-2 and mag-fura-2 to measure cytoplasmic and intraluminal internal stores [Ca2+], respectively. Furthermore, green fluorescent protein (GFP)-based probes were used to monitor time courses of phospholipase C (PLC) activation (pleckstrin-homology [PH]-PLCdelta-GFP), and translocation of protein kinase C (PKC) and a major PKC substrate, myristolated alanine-rich C-kinase substrate (MARCKS). Read More

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Translocation of protein kinase-C with IP3-induced calcium mobilization by heat-stable enterotoxin of Vibrio cholerae non-O1 in isolated rat enterocytes.

Int J Med Microbiol 2003 Dec;293(6):413-20

Division of Pathophysiology, National Institute of Cholera and Enteric Diseases, Beliaghata, Kolkata, India.

The activity of the calcium- and phospholipid-dependent enzyme protein kinase C (PKC) in response to heat-stable enterotoxin (NAG-ST) of Vibrio cholerae non-O1 was examined in isolated rat enterocytes. Optimal stimulation of the membrane-bound PKC activity (about 4.3-fold) was observed after 1 min of incubation of cells with 10 ng/ml toxin; and the effects were dose dependent. Read More

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December 2003

Involvement of the ERK signaling cascade in protein kinase C-mediated cell cycle arrest in intestinal epithelial cells.

J Biol Chem 2004 Mar 11;279(10):9233-47. Epub 2003 Dec 11.

Department of Pharmacology and Therapeutics, Roswell Park Cancer Institute, Buffalo, New York 14263, USA.

We have reported previously that protein kinase C (PKC) signaling can mediate a program of cell cycle withdrawal in IEC-18 nontransformed intestinal crypt cells, involving rapid disappearance of cyclin D1, increased expression of Cip/Kip cyclin-dependent kinase inhibitors, and activation of the growth suppressor function of pocket proteins. In the current study, we present evidence to support a requisite role for PKC alpha in mediating these effects. Furthermore, analysis of the signaling events linking PKC/PKC alpha activation to changes in the cell cycle regulatory machinery implicate the Ras/Raf/MEK/ERK cascade. Read More

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The potential role of PKC beta in diabetic retinopathy and macular edema.

Surv Ophthalmol 2002 Dec;47 Suppl 2:S263-9

Harvard Medical School and Joslin Diabetes Center, Boston, Massachussetts, USA.

Diabetic retinopathy is one of the most debilitating complications of diabetes mellitus. Despite major advances in understanding the pathogenesis of this disease and the efficacy of current therapies, diabetic retinopathy remains the leading cause of new-onset blindness among working-age people. The mainstay of current therapy, laser photocoagulation, is useful in preventing blindness and severe vision loss but is not often effective in restoring lost visual acuity. Read More

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December 2002

Angiotensin II stimulates renal proximal tubule Na(+)-ATPase activity through the activation of protein kinase C.

Biochim Biophys Acta 2002 Aug;1564(2):310-6

Departamento de Farmacologia Básica e Cli;nica, ICB, Universidade Federal do Rio de Janeiro, CCS-Bloco J, 21949-900, RJ, Rio de Janeiro, Brazil.

Recently, our group described an AT(1)-mediated direct stimulatory effect of angiotensin II (Ang II) on the Na(+)-ATPase activity of proximal tubules basolateral membranes (BLM) [Am. J. Physiol. Read More

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High glucose induced VEGF expression via PKC and ERK in glomerular podocytes.

Biochem Biophys Res Commun 2002 Jan;290(1):177-84

Department of Pathology, Institute of Basic Medical Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan.

Podocytes are the major site of vascular endothelial growth factor (VEGF) production in the kidney, and up-regulation of VEGF plays a critical role in the progression of diabetic nephropathy. Using a differentiated mouse podocyte cell line, we investigated the roles of protein kinase C (PKC) and extracellular signal-regulated kinase (ERK) on the expression of VEGF under high glucose conditions. High glucose induced up-regulation of VEGF mRNA and protein expression in podocytes via activation of PKC (PKC-alpha and -betaII isoforms) and ERK. Read More

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January 2002

Enhanced PKC beta II translocation and PKC beta II-RACK1 interactions in PKC epsilon-induced heart failure: a role for RACK1.

Am J Physiol Heart Circ Physiol 2001 Dec;281(6):H2500-10

Department of Physiology and Biophysics, University of Louisville, Louisville, Kentucky 40202, USA.

Recent investigations have established a role for the beta II-isoform of protein kinase C (PKC beta II) in the induction of cardiac hypertrophy and failure. Although receptors for activated C kinase (RACKs) have been shown to direct PKC signal transduction, the mechanism through which RACK1, a selective PKC beta II RACK, participates in PKC beta II-mediated cardiac hypertrophy and failure remains undefined. We have previously reported that PKC epsilon activation modulates the expression of RACKs, and that altered epsilon-isoform of PKC (PKC epsilon)-RACK interactions may facilitate the genesis of cardiac phenotypes in mice. Read More

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December 2001

Transmural differences in rat ventricular protein kinase C epsilon correlate with its functional regulation of a transient cardiac K+ current.

J Physiol 2001 May;533(Pt 1):145-54

Department of Biochemistry and Molecular Biology, Canadian Institute of Health Research Group in Regulation of Vascular Contractility, Calgary, Alberta, Canada.

The effects of PKC activation on a transient (It) and a sustained (Iss) cardiac K+ current and the subcellular distribution of the epsilon isoform of PKC (PKC(epsilon)) were compared in epicardial and endocardial regions of the rat ventricle. Activation of PKC(epsilon) with a diacylglycerol analogue (di-octanoyl-glycerol (DiC8), 20 (mu)M) leads to differential effects in epicardial and endocardial cells. In epicardial cells (n = 20) It and Iss are attenuated by 17. Read More

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Protein kinase C-induced phosphorylation modulates the Na(+)-ATPase activity from proximal tubules.

Biochim Biophys Acta 2001 May;1512(1):90-7

Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, CCS-Bloco G, 21949-900, Rio de Janeiro, RJ, Brazil.

This study describes the modulation of the ouabain-insensitive Na(+)-ATPase activity from renal proximal tubule basolateral membranes (BLM) by protein kinase C (PKC). Two PKC isoforms were identified in BLM, one of 75 kDa and the other of 135 kDa. The former correlates with the PKC isoforms described in the literature but the latter seems to be a novel isoform, not yet identified. Read More

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Leukotriene D(4) affects localisation of vinculin in intestinal epithelial cells via distinct tyrosine kinase and protein kinase C controlled events.

J Cell Sci 2001 May;114(Pt 10):1925-34

Division of Experimental Pathology, Department of Laboratory Medicine, Lund University, Malmö University Hospital, SE-205 02 Malmö, Sweden.

Local inflammatory reactions affect the integrity of intestinal epithelial cells, such as E-cadherin-mediated cell-cell interactions. To elucidate this event, we investigated the effects of an inflammatory mediator, leukotriene D(4 )(LTD(4)), on the phosphorylation status and properties of vinculin, a multi-binding protein known to interact with both the E-cadherin-catenin complex and the cytoskeleton. Treatment of an intestinal epithelial cell line with LTD(4 )induced rapid tyrosine phosphorylation of vinculin, which was blocked by the Src family tyrosine kinase inhibitor PP1. Read More

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Aldose reductase inhibitor improves insulin-mediated glucose uptake and prevents migration of human coronary artery smooth muscle cells induced by high glucose.

Hypertension 2000 May;35(5):1092-8

First Department of Internal Medicine, Osaka City University Medical School, Osaka, Japan.

We examined involvement of the polyol pathway in high glucose-induced human coronary artery smooth muscle cell (SMC) migration using Boyden's chamber method. Chronic glucose treatment for 72 hours potentiated, in a concentration-dependent manner (5.6 to 22. Read More

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[Insulin signalling system and mechanism of insulin resistance].

Nihon Rinsho 2000 Feb;58(2):297-303

Second Department of Internal Medicine, Kobe University School of Medicine.

Insulin exerts wide variety of biological effects through interaction with its specific receptor, which belongs to a large family of receptor tyrosine kinases. The activated insulin receptor phosphorylates the intracellular substrate IRS protains, which then bind various signalling molecules that contain Src homology 2 domains. The first downstram molecule that was shown to associate with IRS protains is PI3-kinase. Read More

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February 2000

Photosynthesis and carbon partitioning in transgenic tobacco plants deficient in leaf cytosolic pyruvate kinase

Plant Physiol 1999 Jul;120(3):887-96

Department of Plant Agriculture, University of Guelph, Guelph, Ontario, Canada N1G 2W1 (B.G., J.J.).

Whole-plant diurnal C exchange analysis provided a noninvasive estimation of daily net C gain in transgenic tobacco (Nicotiana tabacum L.) plants deficient in leaf cytosolic pyruvate kinase (PKc-). PKc- plants cultivated under a low light intensity (100 &mgr;mol m-2 s-1) were previously shown to exhibit markedly reduced root growth, as well as delayed shoot and flower development when compared with plants having wild-type levels of PKc (PKc+). Read More

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A high throughput system for the evaluation of protein kinase C inhibitors based on Elk1 transcriptional activation in human astrocytoma cells.

T R Sharif M Sharif

Int J Oncol 1999 Feb;14(2):327-35

Department of Molecular Pharmacology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.

Protein kinase C (PKC) designates a family of kinases that regulate many essential functions including cell growth and differentiation. The tight regulation of PKC activity is crucial for maintaining normal cellular proliferation and excessive activity leads to abnormal or uncontrolled cell growth. Recent reports indicate that malignant glioma cell lines express 100 to 1000-fold higher PKC activity when compared to non-neoplastic astrocytes. Read More

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February 1999

Effects of peptide fragments of protein kinase C on isolated rat osteoclasts.

Exp Physiol 1998 Nov;83(6):717-25

Regional Bone Center, New York State Department of Health, Helen Hayes Hospital, Route 9W, West Haverstraw, NY 10993, USA.

The intracellular mechanisms responsible for inhibition of osteoclast activity are of significant interest in the search for more effective ways of managing bone diseases associated with enhanced bone resorption. Previous studies have suggested that the protein kinase C (PKC) pathway is an important inhibitory second messenger in osteoclasts. We, therefore, investigated the effects of the synthetic peptide fragments, PKC(530-558) and (19-36), which correspond to parts of the catalytic and regulatory domains of PKC, on the activity of isolated osteoclasts. Read More

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November 1998

Lacrimal gland functions are differentially controlled by protein kinase C isoforms.

Ann N Y Acad Sci 1998 Apr;842:217-20

Schepens Eye Research Institute, Harvard Medical School, Boston, Massachusetts 02114, USA.

Lacrimal gland protein secretion is primarily under the control of cholinergic muscarinic and alpha 1-adrenergic receptors. Cholinergic agonists are coupled to the activation of phospholipase C (PLC), which leads to the production of two second messenger molecules: inositol 1,4,5-trisphosphate (IP3) and diacylglycerol (DAG). IP3 increases the cytoplasmic concentration of calcium ([Ca2+]i), and DAG activates protein kinase C (PKC), two events that are thought to trigger protein secretion. Read More

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Altered growth of transgenic tobacco lacking leaf cytosolic pyruvate kinase.

Plant Physiol 1998 Jan;116(1):45-51

Department of Biology, Queen's University, Kingston, Ontario, Canada.

Previously, we reported that transformation of tobacco (Nicotiana tabacum L.) with a vector containing a potato cytosolic pyruvate kinase (PKc) cDNA generated two plant lines specifically lacking leaf PKc (PKc-) as a result of co-suppression. PKc deficiency in these primary transformants did not appear to alter plant development, although root growth was not examined. Read More

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January 1998

Role of protein kinase C in calcium sensitization during muscarinic stimulation in airway smooth muscle.

Am J Physiol 1997 10;273(4):L775-81

Department of Anesthesiology, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55905, USA.

Muscarinic receptor stimulation increases Ca2+ sensitivity, i.e., the amount of force produced at a constant submaximal cytosolic Ca2+ concentration ([Ca2+]i), in permeabilized smooth muscle preparations. Read More

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October 1997

Dietary zinc treatment for chronic copper intoxication in palm kernel cake (PKC) fed sheep.

Malays J Nutr 1996 Sep;2(2):196-206

Faculty of Veterinary Medicine and Animal Science, Universiti Pertanian Malaysia, 43400 UPM Serdang.

Thirty, 4 month-old male Maim x Polled Dorset crossbred sheep were allocated into 6 groups of 5 animals each. Four groups of animals were stall-fed with basal diet of 90% palm kernel cake (PKC) and 10% grass (G) for 16 weeks. One group of the animal was slaughtered at the end of the 16 weeks feeding trial (PKC group), whilst the other three groups were further fed with either the same diet (PKC+PKC group) or fed with a new diet consisting of 30% corn and 10% fish meals (CF) and grass (60%) either with (PKC+CF+Zn group) or without (PKC+CF group) zinc supplementation (500 mg/g Zn as zinc sulfate) for another 16 weeks and were slaughtered at the end of the feeding trial, The other two groups which act as controls were fed with corn (30%) and fish meals (10%) and grass (60%), and were slaughtered at weeks 16 (CF group) and 32 (CF+CF group) of the trial. Read More

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September 1996

A role for MARCKS, the alpha isozyme of protein kinase C and myosin I in zymosan phagocytosis by macrophages.

L H Allen A Aderem

J Exp Med 1995 Sep;182(3):829-40

Laboratory of Signal Transduction, Rockefeller University, New York 10021, USA.

Myristoylated, alanine-rich C-kinase substrate (MARCKS) is a lipopolysaccharide-induced protein kinase C (PKC) substrate that has been proposed to regulate actin-membrane interactions, as well as actin structure at the membrane. We studied the distribution of MARCKS, the alpha isozyme of PKC (PKC alpha), and myosin I in lipopolysaccharide-treated peritoneal macrophages ingesting zymosan particles. MARCKS, PKC alpha, and myosin I colocalized with F-actin and talin in the cortical cytoplasm adjacent to forming phagocytic cups. Read More

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September 1995

Mutant mice lacking the gamma isoform of protein kinase C show decreased behavioral actions of ethanol and altered function of gamma-aminobutyrate type A receptors.

Proc Natl Acad Sci U S A 1995 Apr;92(9):3658-62

Denver Veterans Affairs Medical Center, CO, USA.

Calcium/phospholipid-dependent protein kinase (protein kinase C, PKC) has been suggested to play a role in the sensitivity of gamma-aminobutyrate type A (GABAA) receptors to ethanol. We tested a line of null mutant mice that lacks the gamma isoform of PKC (PKC gamma) to determine the role of this brain-specific isoenzyme in ethanol sensitivity. We found that the mutation reduced the amount of PKC gamma immunoreactivity in cerebellum to undetectable levels without altering the levels of the alpha, beta I, or beta II isoforms of PKC. Read More

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