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Calcium signaling

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https://www.readbyqxmd.com/read/28230278/deletion-of-psychiatric-risk-gene-cacna1c-impairs-hippocampal-neurogenesis-in-cell-autonomous-fashion
#1
Bianca Völkening, Kai Schönig, Golo Kronenberg, Dusan Bartsch, Tillmann Weber
Ca(2+) is a universal signal transducer which fulfills essential functions in cell development and differentiation. CACNA1C, the gene encoding the alpha-1C subunit (i.e., Cav 1.2) of the voltage-dependent l-type calcium channel (LTCC), has been implicated as a risk gene in a variety of neuropsychiatric disorders. To parse the role of Cav 1.2 channels located on astrocyte-like stem cells and their descendants in the development of new granule neurons, we created Tg(GLAST-CreERT2) /Cacna1c(fl/fl) /RCE:loxP mice, a transgenic tool that allows cell-type-specific inducible deletion of Cacna1c...
February 23, 2017: Glia
https://www.readbyqxmd.com/read/28229387/the-effects-of-cerium-valence-states-at-cerium-oxide-coatings-on-the-responses-of-bone-mesenchymal-stem-cells-and-macrophages
#2
Mingyu You, Kai Li, Youtao Xie, Liping Huang, Xuebin Zheng
Ideal orthopedic coatings should trigger good osteogenic response and limited inflammatory response. The cerium valence states in ceria are associated with their anti-oxidative activity and anti-inflammatory property. In the study, we prepared two kinds of plasma sprayed CeO2 coatings with different Ce(4+) concentrations to investigate the effects of Ce valence states on the response of bone mesenchymal stem cells (BMSCs) and macrophage RAW264.7. Both the coatings (CeO2-A and CeO2-B) were characterized via XRD, SEM, and X-ray photoelectron spectroscopy...
February 22, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28229088/glutathione-induces-gaba-release-through-p2x7r-activation-on-m%C3%A3-ller-glia
#3
Hércules Rezende Freitas, Ricardo A de Melo Reis
The retinal tissue of warm-blooded vertebrates performs surprisingly complex and accurate transduction of visual information. To achieve precision, a multilayered neuroglia structure is established throughout the embryonic development, and the presence of radial Müller (glial) cells ensure differentiation, growth and survival for the neuronal elements within retinal environment. It is assumed that Müller cells serve as a dynamic reservoir of progenitors, capable of expressing transcription factors, differentiating and proliferating as either neuronal or glial cells depending on extrinsic cues...
2017: Neurogenesis (Austin, Tex.)
https://www.readbyqxmd.com/read/28228586/modeling-the-diversity-of-spontaneous-and-agonist-induced-electrical-activity-in-anterior-pituitary-corticotrophs
#4
Patrick Allen Fletcher, Hana Zemkova, Stanko S Stojilkovic, Arthur Sherman
Pituitary corticotrophs fire action potentials spontaneously and in response to stimulation with corticotropin-releasing hormone (CRH) and arginine vaspressin (AVP), and such electrical activity is critical for calcium signaling and calcium-dependent adrenocorticotropic hormone (ACTH) secretion. These cells typically fire tall sharp action potentials when spontaneously active, but a variety of other spontaneous patterns have also been reported, including various modes of bursting. There is variability in reports of the fraction of corticotrophs that are electrically active, as well as their patterns of activity, and the sources of this variation are not well understood...
February 22, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28228338/extra-and-intracellular-calcium-signaling-pathway-s-differentially-regulate-histamine-induced-myometrial-contractions-during-early-and-mid-pregnancy-stages-in-buffaloes-bubalus-bubalis
#5
Abhishek Sharma, Udayraj P Nakade, Soumen Choudhury, Rajkumar Singh Yadav, Satish Kumar Garg
This study examines the differential role of calcium signaling pathway(s) in histamine-induced uterotonic action during early and mid-pregnancy stages in buffaloes. Compared to mid pregnancy, tonic contraction, amplitude and mean-integral tension were significantly increased by histamine to produce myometrial contraction during early pregnancy with small effects on phasic contraction and frequency. Although uterotonic action of histamine during both stages of pregnancy is sensitive to nifedipine (a L-type Ca(2+) channels blocker) and NNC55-0396 (T-type Ca(2+) channels blocker), the role of extracellular calcium seems to be more significant during mid-pregnancy as in this stage histamine produced only 9...
February 7, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28228260/chemotherapy-induced-ca-2-release-stimulates-breast-cancer-stem-cell-enrichment
#6
Haiquan Lu, Ivan Chen, Larissa A Shimoda, Youngrok Park, Chuanzhao Zhang, Linh Tran, Huimin Zhang, Gregg L Semenza
Breast cancer stem cells (BCSCs) play a critical role in tumor recurrence and metastasis. Exposure of breast cancer cells to chemotherapy leads to an enrichment of BCSCs. Here, we find that chemotherapy induces the expression of glutathione S-transferase omega 1 (GSTO1), which is dependent on hypoxia-inducible factor 1 (HIF-1) and HIF-2. Knockdown of GSTO1 expression abrogates carboplatin-induced BCSC enrichment, decreases tumor initiation and metastatic capacity, and delays tumor recurrence after chemotherapy...
February 21, 2017: Cell Reports
https://www.readbyqxmd.com/read/28228125/rna-seq-of-life-stages-of-the-oomycete-phytophthora-infestans-reveals-dynamic-changes-in-metabolic-signal-transduction-and-pathogenesis-genes-and-a-major-role-for-calcium-signaling-in-development
#7
Audrey M V Ah-Fong, Kyoung Su Kim, Howard S Judelson
BACKGROUND: The oomycete Phytophthora infestans causes the devastating late blight diseases of potato and tomato. P. infestans uses spores for dissemination and infection, like many other filamentous eukaryotic plant pathogens. The expression of a subset of its genes during spore formation and germination were studied previously, but comprehensive genome-wide data have not been available. RESULTS: RNA-seq was used to profile hyphae, sporangia, sporangia undergoing zoosporogenesis, motile zoospores, and germinated cysts of P...
February 23, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28224704/advanced-glycation-end-products-regulate-anabolic-and-catabolic-activities-via-nlrp3-inflammasome-activation-in-human-nucleus-pulposus-cells
#8
Yu Song, Yan Wang, Yukun Zhang, Wen Geng, Wei Liu, Yong Gao, Shuai Li, Kun Wang, Xinghuo Wu, Liang Kang, Cao Yang
Intervertebral disc degeneration is widely recognized as a cause of lower back pain, neurological dysfunction and other musculoskeletal disorders. The major inflammatory cytokine IL-1β is associated with intervertebral disc degeneration; however, the molecular mechanisms that drive IL-1β production in the intervertebral disc, especially in nucleus pulposus (NP) cells, are unknown. In some tissues, advanced glycation end products (AGEs), which accumulate in NP tissues and promote its degeneration, increase oxidative stress and IL-1β secretion, resulting in disorders, such as obesity, diabetes mellitus and ageing...
February 22, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28224334/the-trpm4-channel-is-functionally-important-for-the-beneficial-cardiac-remodeling-induced-by-endurance-training
#9
Mélanie Gueffier, Justin Zintz, Karen Lambert, Amanda Finan, Franck Aimond, Nourdine Chakouri, Christophe Hédon, Mathieu Granier, Pierre Launay, Jérôme Thireau, Sylvain Richard, Marie Demion
Cardiac hypertrophy (CH) is an adaptive process that exists in two distinct forms and allows the heart to adequately respond to an organism's needs. The first form of CH is physiological, adaptive and reversible. The second is pathological, irreversible and associated with fibrosis and cardiomyocyte death. CH involves multiple molecular mechanisms that are still not completely defined but it is now accepted that physiological CH is associated more with the PI3-K/Akt pathway while the main signaling cascade activated in pathological CH involves the Calcineurin-NFAT pathway...
February 21, 2017: Journal of Muscle Research and Cell Motility
https://www.readbyqxmd.com/read/28223942/ameloblastin-peptides-modulates-the-osteogenic-capacity-of-human-mesenchymal-stem-cells
#10
Øystein Stakkestad, Ståle P Lyngstadaas, Jiri Vondrasek, Jan O Gordeladze, Janne Elin Reseland
During amelogenesis the extracellular enamel matrix protein AMBN is quickly processed into 17 kDa (N-terminus) and 23 kDa (C-terminus) fragments. In particular, alternatively spliced regions derived by exon 5/6 within the N-terminus region are known to be critical in biomineralization. Human mesenchymal stem cells (hMSC) also express and secrete AMBN, but it is unclear if this expression has effects on the hMSC themselves. If, as suggested from previous findings, AMBN act as a signaling molecule, such effects could influence hMSC growth and differentiation, as well as promoting the secretion of other signaling proteins like cytokines and chemokines...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28223857/erythrocyte-nanovesicles-biogenesis-biological-roles-and-therapeutic-approach-erythrocyte-nanovesicles
#11
REVIEW
Gamaleldin I Harisa, Mohamed M Badran, Fars K Alanazi
Nanovesicles (NVs) represent a novel transporter for cell signals to modify functions of target cells. Therefore, NVs play many roles in both physiological and pathological processes. This report highlights biogenesis, composition and biological roles of erythrocytes derived nanovesicles (EDNVs). Furthermore, we address utilization of EDNVs as novel drug delivery cargo as well as therapeutic target. EDNVs are lipid bilayer vesicles rich in phospholipids, proteins, lipid raft, and hemoglobin. In vivo EDNVs biogenesis is triggered by an increase of intracellular calcium levels, ATP depletion and under effect of oxidative stress conditions...
January 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28222421/luteolin-enhances-sarcoplasmic-reticulum-ca2-atpase-activity-through-p38-mapk-signaling-thus-improving-rat-cardiac-function-after-ischemia-reperfusion
#12
Shasha Zhu, Tongda Xu, Yuanyuan Luo, Yingying Zhang, Haochen Xuan, Yanfeng Ma, Defeng Pan, Dongye Li, Hong Zhu
BACKGROUND/AIMS: A major challenge for current therapeutic strategies against ischemia/reperfusion (I/R) is the lack of effective drugs. Considering luteolin enhances the activity of sarcoplasmic reticulum Ca2+-ATPase (SERCA2a) to improve the systolic/diastolic function of rat hearts and cardiomyocytes during the I/R process, we studied the regulatory function of the p38 MAPK pathway in this protective mechanism. METHODS: Isolated cardiomyocytes and perfused hearts were separately divided into five groups and used to investigate I/R...
February 21, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28222387/baicalein-enhances-the-osteogenic-differentiation-of-human-periodontal-ligament-cells-by-activating-the-wnt-%C3%AE-catenin-signaling-pathway
#13
Li-Jiao Chen, Bi-Bo Hu, Xin-Lian Shi, Man-Man Ren, Wen-Bin Yu, Sheng-Dan Cen, Rong-Dang Hu, Hui Deng
OBJECTIVE: Periodontium regeneration is one of the most important processes for periodontitis therapy. Human periodontal ligament cells (hPDLCs) play a vital role in the repair and regeneration of periodontal tissues. Our study aimed to investigated the mechanisms underlying the promotion of hPLDCs osteogenic differentiation by baicalein. DESIGN: hPDLCs were obtained from periodontal ligament (PDL) tissues by primary culture. The MTT assay was used to determine the growth curves of hPDLCs treated with different concentrations of baicalein (1...
February 7, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28220501/chronic-alcohol-feeding-potentiates-hormone-induced-calcium-signalling-in-hepatocytes
#14
Paula J Bartlett, Anil Noronha Antony, Amit Agarwal, Mauricette Hilly, Victoria L Prince, Laurent Combettes, Jan B Hoek, Lawrence D Gaspers
"Adaptive" responses of the liver to chronic alcohol consumption may underlie the development of cell and tissue injury. Alcohol administration can perturb multiple signalling pathways including phosphoinositide-dependent cytosolic calcium ([Ca(2+) ]i ) increases, which can adversely affect mitochondrial Ca(2+) levels, reactive oxygen species production and energy metabolism. Our data indicate that chronic alcohol feeding induces a leftward shift in the dose-response for Ca(2+) -mobilizing hormones resulting in more sustained and prolonged [Ca(2+) ]i increases in both cultured hepatocytes and hepatocytes within the intact perfused liver...
February 20, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28220424/cdpk-activation-in-prr-signaling
#15
Heike Seybold, Marie Boudsocq, Tina Romeis
Calcium-dependent protein kinases undergo a rapid biochemical activation in response to an intracellular Ca increase induced by the PRR-dependent perception of a pathogen-related stimulus. Based on SDS gel resolution, the in-gel kinase assay allows the analysis of multiple in vivo protein samples in parallel, combining the advantage of protein separation according to molecular mass with the activity read-out of a protein kinase assay. It thus enables to follow the transient CDPK activation and inactivation in response to in vivo elicitation with a time-wise resolution...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28220412/characterization-of-plant-cell-wall-damage-associated-molecular-patterns-regulating-immune-responses
#16
Laura Bacete, Hugo Mélida, Sivakumar Pattathil, Michael G Hahn, Antonio Molina, Eva Miedes
The plant cell wall is one of the first defensive barriers that pathogens need to overcome to successfully colonize plant tissues. Plant cell wall is considered a dynamic structure that regulates both constitutive and inducible defense mechanisms. The wall is a potential source of a diverse set of Damage-Associated Molecular Patterns (DAMPs), which are signalling molecules that trigger immune responses. However, just a few active wall ligands, such as oligogalacturonic acids (OGs), have been characterized so far...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28220078/inhibition-of-vegfr2-activation-and-its-downstream-signaling-to-erk1-2-and-calcium-by-thrombospondin-1-tsp1-in-silico-investigation
#17
Hojjat Bazzazi, Jeffery S Isenberg, Aleksander S Popel
VEGF signaling through VEGFR2 is a central regulator of the angiogenic response. Inhibition of VEGF signaling by the stress-induced matricellular protein TSP1 plays a role in modulating the angiogenic response to VEGF in both health and disease. TSP1 binding to CD47 inhibits VEGFR2 activation. The full implications of this inhibitory interaction are unknown. We developed a detailed rule-based computational model to inquire if TSP1-CD47 signaling through VEGF had downstream effects upon ERK1/2 and calcium. Our Simulations suggest that enhanced degradation of VEGFR2 initiated by the binding of TSP1 to CD47 is sufficient to explain the inhibition of VEGFR2 phosphorylation, calcium elevation, and ERK1/2 activation downstream of VEGF...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28219946/distinct-intracellular-ca-2-dynamics-regulate-apical-constriction-and-differentially-contribute-to-neural-tube-closure
#18
Makoto Suzuki, Masanao Sato, Hiroshi Koyama, Yusuke Hara, Kentaro Hayashi, Naoko Yasue, Hiromi Imamura, Toshihiko Fujimori, Takeharu Nagai, Robert E Campbell, Naoto Ueno
Early in the development of the central nervous system, progenitor cells undergo a shape change, called apical constriction, that triggers the neural plate to form a tubular structure. How apical constriction in the neural plate is controlled, and contributes to tissue morphogenesis, are not fully understood. In this study, we show that intracellular calcium ions (Ca(2+)) are required for Xenopus neural tube formation, and that there are two types of Ca(2+)-concentration changes, a single-cell and a multicellular wave-like fluctuation, in the developing neural plate...
February 20, 2017: Development
https://www.readbyqxmd.com/read/28219342/effects-of-exposure-to-streptococcus-iniae-on-microrna-expression-in-the-head-kidney-of-genetically-improved-farmed-tilapia-oreochromis-niloticus
#19
Jun Qiang, Fanyi Tao, Jie He, Lanyi Sun, Pao Xu, Wenjin Bao
BACKGROUND: Genetically improved farmed tilapia (GIFT, Oreochromis niloticus) are susceptible to infection by Streptococcus iniae when maintained in modern intensive culture systems. GIFT are commercially important fishes that are cultured widely in southern China. The role of microRNAs (miRNAs) in the regulatory response of GIFT to S. iniae infection has been underestimated and has not yet been well studied. Head kidney has an important immune function in teleost fishes. The main aim of this study was to determine the possible function of miRNAs in head kidney of S...
February 20, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28218743/vitamin-d-signaling-and-melanoma-role-of-vitamin-d-and-its-receptors-in-melanoma-progression-and-management
#20
REVIEW
Andrzej T Slominski, Anna A Brożyna, Michal A Zmijewski, Wojciech Jóźwicki, Anton M Jetten, Rebecca S Mason, Robert C Tuckey, Craig A Elmets
Ultraviolet B (UVB), in addition to having carcinogenic activity, is required for the production of vitamin D3 (D3) in the skin which supplies >90% of the body's requirement. Vitamin D is activated through hydroxylation by 25-hydroxylases (CYP2R1 or CYP27A1) and 1α-hydroxylase (CYP27B1) to produce 1,25(OH)2D3, or through the action of CYP11A1 to produce mono-di- and trihydroxy-D3 products that can be further modified by CYP27B1, CYP27A1, and CYP24A1. The active forms of D3, in addition to regulating calcium metabolism, exert pleiotropic activities, which include anticarcinogenic and anti-melanoma effects in experimental models, with photoprotection against UVB-induced damage...
February 20, 2017: Laboratory Investigation; a Journal of Technical Methods and Pathology
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