Thematische Bibliographien / Cdc42 isoforms

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Auswahl der wissenschaftlichen Literatur zum Thema „Cdc42 isoforms“

Autor: Grafiati

Veröffentlicht am 25. Mai 2024

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Zeitschriftenartikel zum Thema "Cdc42 isoforms"

Ravindran, Priyadarshini, und Andreas W. Püschel. „An isoform-specific function of Cdc42 in regulating mammalian Exo70 during axon formation“. Life Science Alliance 6, Nr. 3 (21.12.2022): e202201722. http://dx.doi.org/10.26508/lsa.202201722.

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The highly conserved GTPase Cdc42 is an essential regulator of cell polarity and promotes exocytosis through the exocyst complex in budding yeast andDrosophila. In mammals, this function is performed by the closely related GTPase TC10, whereas mammalian Cdc42 does not interact with the exocyst. Axon formation is facilitated by the exocyst complex that tethers vesicles before their fusion to expand the plasma membrane. This function depends on the recruitment of the Exo70 subunit to the plasma membrane. Alternative splicing generates two Cdc42 isoforms that differ in their C-terminal 10 amino acids. Our results identify an isoform-specific function of Cdc42 in neurons. We show that the brain-specific Cdc42b isoform, in contrast to the ubiquitous isoform Cdc42u, can interact with Exo70. Inactivation of Arhgef7 or Cdc42b interferes with the exocytosis of post-Golgi vesicles in the growth cone. Cdc42b regulates exocytosis and axon formation downstream of its activator Arhgef7. Thus, the function of Cdc42 in regulating exocytosis is conserved in mammals but specific to one isoform.

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Jansson, Thomas, Marisol Castillo-Castrejon, Madhulika B. Gupta, Theresa L. Powell und Fredrick J. Rosario. „Down-regulation of placental Cdc42 and Rac1 links mTORC2 inhibition to decreased trophoblast amino acid transport in human intrauterine growth restriction“. Clinical Science 134, Nr. 1 (Januar 2020): 53–70. http://dx.doi.org/10.1042/cs20190794.

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Abstract Intrauterine growth restriction (IUGR) increases the risk for perinatal complications and metabolic and cardiovascular disease later in life. The syncytiotrophoblast (ST) is the transporting epithelium of the human placenta, and decreased expression of amino acid transporter isoforms in the ST plasma membranes is believed to contribute to IUGR. Placental mechanistic target of rapamycin Complex 2 (mTORC2) signaling is inhibited in IUGR and regulates the trafficking of key amino acid transporter (AAT) isoforms to the ST plasma membrane; however, the molecular mechanisms are unknown. Cdc42 and Rac1 are Rho-GTPases that regulate actin-binding proteins, thereby modulating the structure and dynamics of the actin cytoskeleton. We hypothesized that inhibition of mTORC2 decreases AAT expression in the plasma membrane and amino acid uptake in primary human trophoblast (PHT) cells mediated by down-regulation of Cdc42 and Rac1. mTORC2, but not mTORC1, inhibition decreased the Cdc42 and Rac1 expression. Silencing of Cdc42 and Rac1 inhibited the activity of the System L and A transporters and markedly decreased the trafficking of LAT1 (System L isoform) and SNAT2 (System A isoform) to the plasma membrane. mTORC2 inhibition by silencing of rictor failed to decrease AAT following activation of Cdc42/Rac1. Placental Cdc42 and Rac1 protein expression was down-regulated in human IUGR and was positively correlated with placental mTORC2 signaling. In conclusion, mTORC2 regulates AAT trafficking in PHT cells by modulating Cdc42 and Rac1. Placental mTORC2 inhibition in human IUGR may contribute to decreased placental amino acid transfer and reduced fetal growth mediated by down-regulation of Cdc42 and Rac1.

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Fediuk, Jena, Anurag S. Sikarwar, Nora Nolette und Shyamala Dakshinamurti. „Thromboxane-induced actin polymerization in hypoxic neonatal pulmonary arterial myocytes involves Cdc42 signaling“. American Journal of Physiology-Lung Cellular and Molecular Physiology 307, Nr. 11 (01.12.2014): L877—L887. http://dx.doi.org/10.1152/ajplung.00036.2014.

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In hypoxic pulmonary arterial (PA) myocytes, challenge with thromboxane mimetic U46619 induces marked actin polymerization and contraction, phenotypic features of persistent pulmonary hypertension of the newborn (PPHN). Rho GTPases regulate the actin cytoskeleton. We previously reported that U46619-induced actin polymerization in hypoxic PA myocytes occurs independently of the RhoA pathway and hypothesized involvement of the Cdc42 pathway. PA myocytes grown in normoxia or hypoxia for 72 h were stimulated with U46619, then analyzed for Rac/Cdc42 activation by affinity precipitation, phosphatidylinositide-3-kinase (PI3K) activity by phospho-Akt, phospho-p21-activated kinase (PAK) by immunoblot, and association of Cdc42 with neuronal Wiskott Aldrich Syndrome protein (N-WASp) by immunoprecipitation. The effect of Rac or PAK inhibition on filamentous actin was quantified by laser-scanning cytometry and by cytoskeletal fractionation; effects of actin-modifying agents were measured by isometric myography. Basal Cdc42 activity increased in hypoxia, whereas Rac activity decreased. U46619 challenge increased Cdc42 and Rac activity in hypoxic cells, independently of PI3K. Hypoxia increased phospho-PAK, unaltered by U46619. Association of Cdc42 with N-WASp decreased in hypoxia but increased after U46619 exposure. Hypoxia doubled filamentous-to-globular ratios of α- and γ-actin isoforms. Jasplakinolide stabilized γ-filaments, increasing force; cytochalasin D depolymerized all actin isoforms, decreasing force. Rac and PAK inhibition decreased filamentous actin in tissues although without decrease in force. Rho inhibition decreased myosin phosphorylation and force. Hypoxia induces actin polymerization in PA myocytes, particularly increasing filamentous α- and γ-actin, contributing to U46619-induced contraction. Hypoxic PA myocytes challenged with a thromboxane mimetic polymerize actin via the Cdc42 pathway, reflecting increased Cdc42 association with N-WASp. Mechanisms regulating thromboxane-mediated actin polymerization are potential targets for future PPHN pharmacotherapy.

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Kolyada, Alexey Y., Kathleen N. Riley und Ira M. Herman. „Rho GTPase signaling modulates cell shape and contractile phenotype in an isoactin-specific manner“. American Journal of Physiology-Cell Physiology 285, Nr. 5 (November 2003): C1116—C1121. http://dx.doi.org/10.1152/ajpcell.00177.2003.

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Rho family small GTPases (Rho, Rac, and Cdc42) play an important role in cell motility, adhesion, and cell division by signaling reorganization of the actin cytoskeleton. Here, we report an isoactin-specific, Rho GTPase-dependent signaling cascade in cells simultaneously expressing smooth muscle and nonmuscle actin isoforms. We transfected primary cultures of microvascular pericytes, cells related to vascular smooth muscle cells, with various Rho-related and Rho-specific expression plasmids. Overexpression of dominant positive Rho resulted in the formation of nonmuscle actin-containing stress fibers. At the same time, α-vascular smooth muscle actin (αVSMactin) containing stress fibers were disassembled, resulting in a dramatic reduction in cell size. Rho activation also yielded a disassembly of smooth muscle myosin and nonmuscle myosin from stress fibers. Overexpression of wild-type Rho had similar but less dramatic effects. In contrast, dominant negative Rho and C3 exotransferase or dominant positive Rac and Cdc42 expression failed to alter the actin cytoskeleton in an isoform-specific manner. The loss of smooth muscle contractile protein isoforms in pericyte stress fibers, together with a concomitant decrease in cell size, suggests that Rho activation influences “contractile” phenotype in an isoactin-specific manner. This, in turn, should yield significant alteration in microvascular remodeling during developmental and pathologic angiogenesis.

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Zhou, Rihong, Zhen Guo, Charles Watson, Emily Chen, Rong Kong, Wenxian Wang und Xuebiao Yao. „Polarized Distribution of IQGAP Proteins in Gastric Parietal Cells and Their Roles in Regulated Epithelial Cell Secretion“. Molecular Biology of the Cell 14, Nr. 3 (März 2003): 1097–108. http://dx.doi.org/10.1091/mbc.e02-07-0425.

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Actin cytoskeleton plays an important role in the establishment of epithelial cell polarity. Cdc42, a member of Rho GTPase family, modulates actin dynamics via its regulators, such as IQGAP proteins. Gastric parietal cells are polarized epithelial cells in which regulated acid secretion occurs in the apical membrane upon stimulation. We have previously shown that actin isoforms are polarized to different membrane domains and that the integrity of the actin cytoskeleton is essential for acid secretion. Herein, we show that Cdc42 is preferentially distributed to the apical membrane of gastric parietal cells. In addition, we revealed that two Cdc42 regulators, IQGAP1 and IQGAP2, are present in gastric parietal cells. Interestingly, IQGAP2 is polarized to the apical membrane of the parietal cells, whereas IQGAP1 is mainly distributed to the basolateral membrane. An IQGAP peptide that competes with full-length IQGAP proteins for Cdc42-binding in vitro also inhibits acid secretion in streptolysin-O-permeabilized gastric glands. Furthermore, this peptide disrupts the association of IQGAP and Cdc42 with the apical actin cytoskeleton and prevents the apical membrane remodeling upon stimulation. We propose that IQGAP2 forms a link that associates Cdc42 with the apical cytoskeleton and thus allows for activation of polarized secretion in gastric parietal cells.

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Fotiadou, Poppy P., Chiaki Takahashi, Hasan N. Rajabi und Mark E. Ewen. „Wild-Type NRas and KRas Perform Distinct Functions during Transformation“. Molecular and Cellular Biology 27, Nr. 19 (16.07.2007): 6742–55. http://dx.doi.org/10.1128/mcb.00234-07.

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ABSTRACT The ras proto-oncogenes, of which there are four isoforms, are molecular switches that function in signal transduction pathways to control cell differentiation, proliferation, and survival. How the Ras isoforms orchestrate cellular processes that affect behavior is poorly understood. Further, why cells express two or more Ras isoforms is unknown. Here, using a genetically defined system, we show that the presence of both wild-type KRas and NRas isoforms is required for transformation because they perform distinct nonoverlapping functions: wild-type NRas regulates adhesion, and KRas coordinates motility. Remarkably, we find that Ras isoforms achieve functional specificity by engaging different signaling pathways to affect the same cellular processes, thereby coordinating cellular outcome. Although we find that signaling from both isoforms intersects in actin and microtubule cytoskeletons, our results suggest that KRas signals through Akt and Cdc42 while NRas signals through Raf and RhoA. Our analyses suggest a previously unappreciated convergence of different Ras isoforms on the dynamics of the processes involved in transformation.

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Wang, Lin, William A. Rudert, Anatoly Grishin, Patrice Dombrosky-Ferlan, Kevin Sullivan, Xiaoying Deng, David Whitcomb und Seth Corey. „Identification and genetic analysis of human and mouse activated Cdc42 interacting protein-4 isoforms“. Biochemical and Biophysical Research Communications 293, Nr. 5 (Mai 2002): 1426–30. http://dx.doi.org/10.1016/s0006-291x(02)00398-4.

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Jaiswal, Mamta, Eyad Kalawy Fansa, Radovan Dvorsky und Mohammad Reza Ahmadian. „New insight into the molecular switch mechanism of human Rho family proteins: shifting a paradigm“. Biological Chemistry 394, Nr. 1 (01.01.2013): 89–95. http://dx.doi.org/10.1515/hsz-2012-0207.

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Abstract Major advances have been made in understanding the structure, function and regulation of the small GTP-binding proteins of the Rho family and their involvement in multiple cellular process and disorders. However, intrinsic nucleotide exchange and hydrolysis reactions, which are known to be fundamental to Rho family proteins, have been partially investigated in the case of RhoA, Rac1 and Cdc42, but for others not at all. Here we present a comprehensive and quantitative analysis of the molecular switch functions of 15 members of the Rho family that enabled us to propose an active GTP-bound state for the rather uncharacterized isoforms RhoD and Rif under equilibrium and quiescent conditions.

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Tcherkezian, Joseph, Eric I. Danek, Sarah Jenna, Ibtissem Triki und Nathalie Lamarche-Vane. „Extracellular Signal-Regulated Kinase 1 Interacts with and Phosphorylates CdGAP at an Important Regulatory Site“. Molecular and Cellular Biology 25, Nr. 15 (01.08.2005): 6314–29. http://dx.doi.org/10.1128/mcb.25.15.6314-6329.2005.

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ABSTRACT Rho GTPases regulate multiple cellular processes affecting both cell proliferation and cytoskeletal dynamics. Their cycling between inactive GDP- and active GTP-bound states is tightly regulated by guanine nucleotide exchange factors and GTPase-activating proteins (GAPs). We have previously identified CdGAP (for Cdc42 GTPase-activating protein) as a specific GAP for Rac1 and Cdc42. CdGAP consists of an N-terminal RhoGAP domain and a C-terminal proline-rich region. In addition, CdGAP is a member of the impressively large number of mammalian RhoGAP proteins that is well conserved among both vertebrates and invertebrates. In mice, we find two predominant isoforms of CdGAP differentially expressed in specific tissues. We report here that CdGAP is highly phosphorylated in vivo on serine and threonine residues. We find that CdGAP is phosphorylated downstream of the MEK-extracellular signal-regulated kinase (ERK) pathway in response to serum or platelet-derived growth factor stimulation. Furthermore, CdGAP interacts with and is phosphorylated by ERK-1 and RSK-1 in vitro. A putative DEF (docking for ERK FXFP) domain located in the proline-rich region of CdGAP is required for efficient binding and phosphorylation by ERK1/2. We identify Thr776 as an in vivo target site of ERK1/2 and as an important regulatory site of CdGAP activity. Together, these data suggest that CdGAP is a novel substrate of ERK1/2 and mediates cross talk between the Ras/mitogen-activated protein kinase pathway and regulation of Rac1 activity.

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Lorenzi, Matthew V., Paola Castagnino, Qiong Chen, Yasuhiro Hori und Toru Miki. „Distinct expression patterns and transforming properties of multiple isoforms of Ost, an exchange factor for RhoA and Cdc42“. Oncogene 18, Nr. 33 (August 1999): 4742–55. http://dx.doi.org/10.1038/sj.onc.1202851.

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Dissertationen zum Thema "Cdc42 isoforms"

Ravichandran, Yamini. „Cdc42 isoforms : localization, functions and regulation“. Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS405.

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Les mutations sont responsables de diverses pathologies du développement, en particulier chez les patients atteints de maladies rares ou pour lesquels il n’y a pas de diagnostic clinique clair. Cdc42 est une protéine clé pour la polarité cellulaire, une étape cruciale de nombreux processus cellulaires, comme la migration cellulaire, la division cellulaire ou la réponse immunitaire. Les mutations de Cdc42 entrainent une variété de pathologies, par exemple des dérégulations de la croissance ou de la morphologie faciale ainsi que des anomalies immunologiques, hématologiques et du développement neuronal. Les fonctions de Cdc42 reposent en grande partie sur la localisation de cette protéine dans la cellule. La comparaison des différentes formes de Cdc42 et de certaines formes mutantes montrent que les derniers acides aminés de la protéine jouent un rôle clé dans sa localisation et donc dans sa fonction. Nous avons centré notre étude sur l’identification : 1) des acides aminés essentiels à la localisation de la protéine ; et 2) de nouveaux mécanismes de régulation de Cdc42 responsables de sa localisation intracellulaire. Nous avons aussi montré que les deux isoformes jouent des rôles différents au cours de la migration cellulaire. Ce travail devrait nous permettre de mieux comprendre les pathologies liées aux mutations de Cdc42
Mutations in proteins cause diverse developmental disorders, particularly for individuals with rare diseases or for whom a unifying clinical diagnosis is unknown. Cdc42 is one such protein; vital for establishing cell polarity, a crucial step in many biological processes such as cell migration, division and immune responses. Not surprisingly, mutations in Cdc42 cause a range of diseases such as growth dysregulation, facial dysmorphism and neurodevelopmental, immunological, and hematological abnormalities. In vertebrates there are two isoforms of Cdc42. The first being the ubiquitous isoform, has almost exclusively been studied and the role of the second isoform, being the brain isoform, is largely unknown. We have shown that the two isoforms are localized differently in cells. The ubiquitous isoform is mostly found in the cell cytoplasm and at the plasma membrane, while the Brain isoform localizes at the Golgi apparatus and on intracellular vesicles. We have also shown that the two isoforms carry out different functions during cell migration, suggesting that the differences between these two isoforms which only differs by the last 10 amino acids are responsible for their distinct localisation and function. Interestingly, a mutation in the C-ter sequence of Cdc42 ubiquitous isoform alters Cdc42 localisation and causes a generalized pustular psoriasis disease. Two main objectives have been studied in this project 1) the impact of the last amino acids of the protein in Cdc42 localization; and 2) new regulatory mechanisms of Cdc42 responsible for its intracellular localization. These findings will bring a better understanding of pathologies related to Cdc42 mutations

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Fediuk, Jena. „Thromboxane receptor signaling and Rho GTPase activation on actin polymerization and contraction in hypoxic neonatal pulmonary arterial myocytes“. Am J Physiol Lung Cell Mol Physiol, 2012. http://hdl.handle.net/1993/23862.

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INTRODUCTION: Persistent Pulmonary Hypertension of the Newborn (PPHN) is defined as the failure of normal circulatory relaxation in the lungs at birth. Hypoxia is known to impede postnatal disassembly of the actin cytoskeleton in pulmonary arterial (PA) myocytes. Actin polymerization (APM), regulated by Rho GTPases, stabilizes force generation. We studied basal and thromboxane (TP)-induced APM and contraction in normoxic and hypoxic PA myocytes and rings. We also examined the downstream signaling pathways regulating hypoxia and TP-induced APM, and the role that actin plays in TP receptor internalization. METHODS: Smooth muscle myocytes from 2nd to 6th generation PAs of newborn piglets were cultured and exposed to hypoxia (10% O2) or normoxia (21% O2) for 72 hrs, then challenged with 10-6M TP-agonist U46619. APM was quantified by laser-scanning cytometry and stress fiber isolation. Downstream signaling pathways of TP receptor were studied by immunoprecipitation, Rhotekin-RBD and PAK-PBD affinity precipitation, Western blot, immunofluoresence and ELISA. Isometric force to serial concentrations of U46619 was measured in resistant PAs from PPHN and 3-day control swine. RESULTS: Hypoxia induced 2-fold APM via alpha- and gamma-actin isoforms, which contributed to increase U46619-induced contraction. Hypoxia decreased TP association with G12/13 in favor of Gαq. Basal RhoA and Cdc42 activity increased in hypoxia, while Rac activity decreased. U46619-challenge did not further alter RhoA activity in hypoxic cells, but increased Cdc42 and Rac activity. Hypoxia increased phosphorylation of LIMK and PAK, unaltered by U46619. Association of Cdc42 with N-WASp decreased in hypoxia, but increased after U46619 exposure. Jasplakinolide significantly stabilized gamma filaments, increasing force generation; cytochalasin D depolymerized all actin isoforms, which attenuated contractile force. Both actin-modifying agents prevented TP endocytosis in NM, while normalizing TP internalization in HM. CONCLUSIONS: PA myocytes exhibit marked RhoA- and Rac-dependent APM in hypoxia. The additional APM response to U46619 challenge is independent of RhoA, but requires Cdc42 signaling. Hypoxia induces APM in PA myocytes, particularly causing an increase in filamentous alpha- and gamma-actin that contributes to increased U46619-induced force generation, a characteristic of PPHN. Dynamic actin also facilitates internalization of the TP receptor. Determining the mechanism that controls TP-mediated APM maybe beneficial as a potential target for PPHN.

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Kiso, Marina. „Long isoform of VEGF stimulates cell migration of breast cancer by filopodia formation via NRP1/ARHGAP17/Cdc42 regulatory network“. Kyoto University, 2018. http://hdl.handle.net/2433/235980.

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Konferenzberichte zum Thema "Cdc42 isoforms"

Kiso, Marina, Sunao Tanaka, Masakazu Toi und Fumiaki Sato. „Abstract 2862: Long isoform of VEGF stimulates cell migration of breast cancer by filopodia formation via NRP1/ARHGAP17/Cdc42 regulatory network“. In Proceedings: AACR Annual Meeting 2019; March 29-April 3, 2019; Atlanta, GA. American Association for Cancer Research, 2019. http://dx.doi.org/10.1158/1538-7445.sabcs18-2862.

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