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https://www.readbyqxmd.com/read/28727921/effect-of-lysophosphatidylglycerol-on-intracellular-free-ca2-concentration-in-a10-vascular-smooth-muscle-cells
#1
Ying Zhang, Jing-Dian Zhang, Ming-Qin Zhu, Ming Zhang, Yan-Jun Xu, Li Cui, Naranjan S Dhalla
Although plasma levels of lysophosphatidylglycerol (LPG) are increased in hypertension, its role in the pathogenesis of vascular defects is not clear. In view of the importance of Ca2+-overload in causing vascular smooth muscle (VSM) dysfunction, the action of LPG on [Ca2+]i in cultured A10 VSM cell line was examined by using Fura 2-AM acetoxymethyl ester technique. LPG was found to induce a concentration-dependent increase in [Ca2+]i in VSM cells. This change was dependent both on the extracellular and intracellular Ca2+ sources as it was reduced by 30% by EGTA, an extracellular Ca2+ chelator, and 70% by tharpsigargin, a sarcoplasmic reticulum (SR) Ca2+-pump inhibitor...
July 20, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28725634/ip3-receptor-mediated-calcium-signaling-and-its-role-in-autophagy-in-cancer
#2
REVIEW
Elzbieta Kania, Gemma Roest, Tim Vervliet, Jan B Parys, Geert Bultynck
Calcium ions (Ca(2+)) play a complex role in orchestrating diverse cellular processes, including cell death and survival. To trigger signaling cascades, intracellular Ca(2+) is shuffled between the cytoplasm and the major Ca(2+) stores, the endoplasmic reticulum (ER), the mitochondria, and the lysosomes. A key role in the control of Ca(2+) signals is attributed to the inositol 1,4,5-trisphosphate (IP3) receptors (IP3Rs), the main Ca(2+)-release channels in the ER. IP3Rs can transfer Ca(2+) to the mitochondria, thereby not only stimulating core metabolic pathways but also increasing apoptosis sensitivity and inhibiting basal autophagy...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28713009/aeromonas-hydrophila-induced-alterations-in-cytosolic-calcium-activate-pro-apoptotic-cpkc-mek1-2-tnf%C3%AE-axis-in-infected-headkidney-macrophages-of-clarias-gariepinus
#3
Asha Shelly, Chaitali Banerjee, Gunjan Kumar Saurav, Atish Ray, Vipin Singh Rana, Rajagopal Raman, Shibnath Mazumder
Alterations in intracellular-calcium (Ca(2+))i homeostasis is critical to Aeromonas hydrophila-induced headkidney macrophages (HKM) apoptosis of Clarias gariepinus, though the implications are poorly understood. Here, we describe the role of intermediate molecules of Ca(2+-)signaling pathway that are involved in HKM apoptosis. We observed phosphoinositide-3-kinase/phospholipase C is critical for (Ca(2+))i release in infected HKM. Heightened protein kinase-C (PKC) activity and phosphorylation of MEK1/2-ERK1/2 was noted which declined in presence of 2-APB, Go6976 and PD98059, inhibitors to IP3-receptor, conventional PKC isoforms (cPKC) and MEK1/2 respectively implicating Ca(2+)/cPKC/MEK-ERK1/2 axis imperative in A...
July 13, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28708511/fsh-receptor-binding-inhibitor-influences-estrogen-production-receptor-expression-and-signal-pathway-during-in%C3%A2-vitro-maturation-of-sheep-cocs
#4
Gong Zhuandi, Liang Haoqin, Deng Yingying, Lai Luju, Wei Suocheng, Zhaxi Yingpai, Li You
Follicle-stimulating hormone (FSH) promotes secretion of follicle fluid and follicle development. FSH acts via cognate FSH receptor (FSHR). It remains unknown whether the supplement of FSH-receptor binding inhibitor (FRBI) into the in vitro maturation (IVM)medium influence the estrogen receptor expression and signal pathway of oocytes in sheep. The present study aimed to investigate FRBI effects on inositol trisphosphate (IP3) of oocytes and protein kinase A (PKA) of sheep granulosa cells, further to elucidate the signal pathway of FRBI effects...
June 29, 2017: Theriogenology
https://www.readbyqxmd.com/read/28705807/augmentation-of-cgmp-pkg-pathway-and-colonic-motility-by-hydrogen-sulfide
#5
Ancy D Nalli, Sayak Bhattacharya, Hongxia Wang, Derek M Kendig, John R Grider, Karnam S Murthy
Hydrogen sulfide (H2S), like nitric oxide (NO), causes smooth muscle relaxation, but unlike NO, does not stimulate soluble guanylyl cyclase (sGC) activity and generate cGMP. The aim of this study was to investigate the interplay between NO and H2S in colonic smooth muscle. In colonic smooth muscle from rabbit, mouse and human, L-cysteine, substrate of cystathionine-γ-lyase (CSE), or NaHS, an H2S donor, inhibited phosphodiesterase 5 (PDE5) activity and augmented the increase in cGMP levels, IP3 receptor phosphorylation at Ser(1756) (measured as a proxy for PKG activation), and muscle relaxation in response to NO donor, s-nitrosoglutathione (GSNO), suggesting augmentation of cGMP/PKG pathway by H2S...
July 13, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28700117/infrared-neural-stimulation-induces-intracellular-ca-2-release-mediated-by-phospholipase-c
#6
David Moreau, Claire Lefort, Jolien Pas, Sylvia M Bardet, Philippe Leveque, Rodney P O'Connor
The influence of infrared laser pulses on intracellular Ca(2+) signaling was investigated in neural cell lines with fluorescent live cell imaging. The probe Fluo-4 was used to measure Ca(2+) in HT22 mouse hippocampal neurons and non-electrically excitable U87 human glioblastoma cells exposed to 50-500 ms infrared pulses at 1470 nm. Fluorescence recordings of Fluo-4 demonstrated that infrared stimulation induced an instantaneous intracellular Ca(2+) transient with similar dose-response characteristics in hippocampal neurons and glioblastoma cells (half-maximal effective energy density EC50 of around 58 J...
July 12, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28677119/atp-evokes-ca-2-signals-in-cultured-foetal-human-cortical-astrocytes-entirely-through-g-protein-coupled-p2y-receptors
#7
Margit S Muller, Colin W Taylor
Extracellular ATP plays important roles in coordinating the activities of astrocytes and neurons, and aberrant signalling is associated with neurodegenerative diseases. In rodents, ATP stimulates opening of Ca(2+) -permeable channels formed by P2X receptor subunits in the plasma membrane. It is widely assumed, but not verified, that P2X receptors also evoke Ca(2+) signals in human astrocytes. Here we directly assess this hypothesis. We showed that cultured foetal cortical human astrocytes express mRNA for several P2X receptor subunits (P2X4 , P2X5 , P2X6 ) and G-protein-coupled P2Y receptors (P2Y1 , P2Y2 , P2Y6 , P2Y11 )...
July 5, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28676489/voltage-dependent-ca-2-entry-into-smooth-muscle-during-contraction-promotes-endothelium-mediated-feedback-vasodilation-in-arterioles
#8
Christopher J Garland, Pooneh Bagher, Chloe Powell, Xi Ye, Hamish A L Lemmey, Lyudmyla Borysova, Kim A Dora
Vascular smooth muscle contraction is suppressed by feedback dilation mediated by the endothelium. In skeletal muscle arterioles, this feedback can be activated by Ca(2+) signals passing from smooth muscle through gap junctions to endothelial cells, which protrude through holes in the internal elastic lamina to make contact with vascular smooth muscle cells. Although hypothetically either Ca(2+) or inositol trisphosphate (IP3) may provide the intercellular signal, it is generally thought that IP3 diffusion is responsible...
July 4, 2017: Science Signaling
https://www.readbyqxmd.com/read/28674006/clusters-of-calcium-release-channels-harness-the-ising-phase-transition-to-confine-their-elementary-intracellular-signals
#9
Anna V Maltsev, Victor A Maltsev, Michael D Stern
Intracellular Ca signals represent a universal mechanism of cell function. Messages carried by Ca are local, rapid, and powerful enough to be delivered over the thermal noise. A higher signal-to-noise ratio is achieved by a cooperative action of Ca release channels such as IP3 receptors or ryanodine receptors arranged in clusters (release units) containing a few to several hundred release channels. The channels synchronize their openings via Ca-induced Ca release, generating high-amplitude local Ca signals known as puffs in neurons and sparks in muscle cells...
July 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28660247/phototransduction-in-drosophila-is-compromised-by-gal4-expression-but-not-by-insp3-receptor-knockdown-or-mutation
#10
Murali K Bollepalli, Marije E Kuipers, Che-Hsiung Liu, Sabrina Asteriti, Roger C Hardie
Drosophila phototransduction is mediated by phospholipase C, leading to activation of transient receptor potential (TRP) and TRP-like (TRPL) channels by mechanisms that are unresolved. A role for InsP3 receptors (IP3Rs) had been excluded because IP3R mutants (itpr) appeared to have normal light responses; however, this was recently challenged by Kohn et al. ("Functional cooperation between the IP3 receptor and phospholipase C secures the high sensitivity to light of Drosophila photoreceptors in vivo," Journal of Neuroscience 35:2530), who reported defects in phototransduction after IP3R-RNAi knockdown...
May 2017: ENeuro
https://www.readbyqxmd.com/read/28655610/neuropeptide-s-nps-is-a-neuropeptide-with-cellular-actions-in-arousal-and-anxiety-related-nuclei-functional-implications-for-effects-of-nps-on-wakefulness-and-mood
#11
Vincenzo Roncacè, Filip Souza Polli, Minella Zojicic, Kristi Anne Kohlmeier
Neuropeptide S (NPS) is a peptide recently recognized to be present in the CNS, and believed to play a role in vigilance and mood control, as behavioral studies have shown it promotes arousal and has an anxiolytic effect. Although NPS precursor is found in very few neurons, NPS positive fibers are present throughout the brain stem. Given the behavioral actions of this peptide and the wide innervation pattern, we examined the cellular effects of NPS within two brain stem nuclei known to play a critical role in anxiety and arousal: the dorsal raphe (DR) and laterodorsal tegmentum (LDT)...
June 24, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28655310/protease-activated-receptor-1-activation-by-granzyme-b-causes-neurotoxicity-that-is-augmented-by-interleukin-1%C3%AE
#12
Paul R Lee, Tory P Johnson, Sharmilee Gnanapavan, Gavin Giovannoni, Tongguang Wang, Joseph P Steiner, Marie Medynets, Mark J Vaal, Valerie Gartner, Avindra Nath
BACKGROUND: The cause of neurodegeneration in progressive forms of multiple sclerosis is unknown. We investigated the impact of specific neuroinflammatory markers on human neurons to identify potential therapeutic targets for neuroprotection against chronic inflammation. METHODS: Surface immunocytochemistry directly visualized protease-activated receptor-1 (PAR1) and interleukin-1 (IL-1) receptors on neurons in human postmortem cortex in patients with and without neuroinflammatory lesions...
June 27, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28634110/pharmacological-rescue-of-ductal-cftr-rescue-pancreatic-and-salivary-glands-acinar-cells-and-tissue-function-in-mouse-models-of-autoimmune-diseases
#13
Mei Zeng, Mitchell Szymczak, Malini Ahuja, Changyu Zheng, Hongen Yin, William Swaim, John A Chiorini, Robert J Bridges, Shmuel Muallem
BACKGROUND & AIMS: Sjögren's syndrome and autoimmune pancreatitis (AIP) are disorders with decreased function of salivary, lacrimal glands, and the exocrine pancreas. NOD/ShiLTJ mice and mice transduced with the cytokine BMP6 develop Sjögren's syndrome and chronic pancreatitis and MRL/Mp mice are models of AIP. CFTR is a ductal Cl(-) channel essential for ductal fluid and HCO3(-) secretion. We used these models to ask: is CFTR expression altered in these diseases, does correction of CFTR correct gland function, and most notably, does correcting ductal function correct acinar function...
June 17, 2017: Gastroenterology
https://www.readbyqxmd.com/read/28633902/calcium-sensing-receptor-initiating-cystathionine-gamma-lyase-hydrogen-sulfide-pathway-to-inhibit-platelet-activation-in-hyperhomocysteinemia-rat
#14
Yuwen Wang, Ziqing Zhao, Sa Shi, Fei Gao, Jichao Wu, Shiyun Dong, Weihua Zhang, Yanhong Liu, Xin Zhong
Hyperhomocysteinemia (HHcy, high homocysteine) induces the injury of endothelial cells (ECs). Hydrogen sulfide (H2S) protects ECs and inhibits the activation of platelets. Calcium-sensing receptor (CaSR) regulates the production of endogenous H2S. However, whether CaSR inhibits the injury of ECs and the activation of platelets by regulating the endogenous cystathionine-gamma-lyase (CSE, a major enzyme that produces H2S)/H2S pathway in hyperhomocysteinemia has not been previously investigated. Here, we tested the ultrastructure alterations of ECs and platelets, the changes in the concentration of serum homocysteine and the parameters of blood of hyperhomocysteinemia rats were measured...
June 19, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28629579/role-of-soce-architects-stim-and-orai-proteins-in-cell-death
#15
REVIEW
Jyoti Tanwar, Rajender K Motiani
Calcium (Ca(2+)) signaling plays a critical role in regulating plethora of cellular functions including cell survival, proliferation and migration. The perturbations in cellular Ca(2+) homeostasis can lead to cell death either by activating autophagic pathways or through induction of apoptosis. Endoplasmic reticulum (ER) is the major storehouse of Ca(2+) within cells and a number of physiological agonists mediate ER Ca(2+) release by activating IP3 receptors (IP3R). This decrease in ER Ca(2+) levels is sensed by STIM, which physically interacts and activates plasma membrane Ca(2+) selective Orai channels...
June 9, 2017: Cell Calcium
https://www.readbyqxmd.com/read/28623807/hiv-tat-excites-d1-receptor-like-expressing-neurons-from-rat-nucleus-accumbens
#16
G Cristina Brailoiu, Elena Deliu, Jeffrey L Barr, Linda M Console-Bram, Alexandra M Ciuciu, Mary E Abood, Ellen M Unterwald, Eugen Brailoiu
BACKGROUND: HIV-1 infection and drug abuse are frequently co-morbid and their association greatly increases the severity of HIV-1-induced neuropathology. While nucleus accumbens (NAcc) function is severely perturbed by drugs of abuse, little is known about how HIV-1 infection affects NAcc. METHODS: We used calcium and voltage imaging to investigate the effect of HIV-1 trans-activator of transcription (Tat) on rat NAcc. Based on previous neuronal studies, we hypothesized that Tat modulates intracellular Ca(2+) homeostasis of NAcc neurons...
June 8, 2017: Drug and Alcohol Dependence
https://www.readbyqxmd.com/read/28620721/a-novel-gain-of-function-mutation-in-the-itpr1-suppressor-domain-causes-spinocerebellar-ataxia-with-altered-ca-2-signal-patterns
#17
Jillian P Casey, Taisei Hirouchi, Chihiro Hisatsune, Bryan Lynch, Raymond Murphy, Aimee M Dunne, Akitoshi Miyamoto, Sean Ennis, Nick van der Spek, Bronagh O'Hici, Katsuhiko Mikoshiba, Sally Ann Lynch
We report three affected members, a mother and her two children, of a non-consanguineous Irish family who presented with a suspected autosomal dominant spinocerebellar ataxia characterized by early motor delay, poor coordination, gait ataxia, and dysarthria. Whole exome sequencing identified a novel missense variant (c.106C>T; p.[Arg36Cys]) in the suppressor domain of type 1 inositol 1,4,5-trisphosphate receptor gene (ITPR1) as the cause of the disorder, resulting in a molecular diagnosis of spinocerebellar ataxia type 29...
July 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28619002/targeting-astrocytes-for-treatment-in-amyotrophic-lateral-sclerosis
#18
Mina Perić, Dinko Mitrečić, Pavle R Andjus
Amyotrophic lateral sclerosis (ALS) is a fatal neurological disorder affecting upper and lower motoneurons. The two types, sporadic and familial differ in the aetiopathogenesis but have a similar neuropathology characterized by oxidative stress, excitotoxicity and inflammation. The disease is also characterized by a non-cell autonomous mechanism with astrocytes playing a central role by affecting synaptic glutamate, the blood-brain barrier, and metabolic and trophic support. Two types of therapeutic approaches focusing on astrocytes are presented: a) emerging molecular targets (potassium inward rectifier channels and aquaporins at the astrocyte endfeet, and IP3 receptor signaling pathway), and b) cell therapy with stem cell - generated and transplanted astrocytes...
June 15, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28615414/loss-of-ip3-receptor-mediated-ca-2-release-in-mouse-b-cells-results-in-abnormal-b-cell-development-and-function
#19
Huayuan Tang, Hong Wang, Qingsong Lin, Feifei Fan, Fei Zhang, Xiaohong Peng, Xi Fang, Jie Liu, Kunfu Ouyang
Intracellular calcium (Ca(2+)) mobilization after engagement of the BCR has been proposed to play an important role in B cell development and function. BCR activation causes an initial Ca(2+) release from the endoplasmic reticulum that is mediated by inositol 1,4,5-trisphosphate receptor (IP3R) and then triggers store-operated Ca(2+) entry once endoplasmic reticulum Ca(2+) store is depleted. Store-operated Ca(2+) entry has been shown to regulate B cell function but is dispensable for B cell development. By contrast, the function of IP3R-mediated Ca(2+) release in B cells remains to be determined...
June 14, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28615319/retinoschisin-is-linked-to-retinal-na-k-atpase-signaling-and-localization
#20
Karolina Plössl, Melanie Royer, Sarah Bernklau, Neslihan N Tavraz, Thomas Friedrich, Jens Wild, Bernhard H F Weber, Ulrike Friedrich
Mutations in the RS1 gene cause X-linked juvenile retinoschisis (XLRS), a hereditary retinal dystrophy. We have recently shown that retinoschisin, the protein encoded by RS1, regulates ERK signaling and apoptosis in retinal cells. In this study, we explored an influence of retinoschisin on the functionality of the Na/K-ATPase, its interaction partner at retinal plasma membranes. We show that retinoschisin binding requires the β2-subunit of the Na/K-ATPase while the α-subunit is exchangeable. Our investigations revealed no impact of retinoschisin on Na/K-ATPase mediated ATP hydrolysis and ion transport...
June 14, 2017: Molecular Biology of the Cell
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