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Article
| Open AccessPKA antagonizes CLASP-dependent microtubule stabilization to re-localize Pom1 and buffer cell size upon glucose limitation
In fission yeast, cell growth is co-ordinated with division by the cell tip-localized DYRK kinase Pom1, which inhibits the medially placed mitotic activator Cdr2. Here, Kelkar and Martin show that, upon glucose starvation, microtubules are destabilized in a PKA-dependent manner, leading to the deposition of Pom1 at cell sides where it delays mitosis.
- Manasi Kelkar
- & Sophie G. Martin
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Article
| Open AccessA PI3K p110β–Rac signalling loop mediates Pten-loss-induced perturbation of haematopoiesis and leukaemogenesis
The tumor suppressor PTEN antagonizes the PI3K signalling pathway and is frequently inactivated in haematological malignancies. Here, the authors unravel the main contribution of the PI3K isoform p110ß to leukemic transformation driven by PTEN-loss.
- Haluk Yuzugullu
- , Lukas Baitsch
- & Jean J. Zhao
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Article
| Open AccessMesenchymal stem cells use extracellular vesicles to outsource mitophagy and shuttle microRNAs
The physiological role of crosstalk between mesenchymal stem cells (MSC) and macrophages is unclear. Here, Phinney et al. show that MSCs transfer mitochondria to macrophages under oxidative stress, and desensitize macrophages to mitochondria by using microvesicles to repress Toll receptor signalling.
- Donald G. Phinney
- , Michelangelo Di Giuseppe
- & Luis A. Ortiz
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Article
| Open AccessMembrane stiffening by STOML3 facilitates mechanosensation in sensory neurons
To maintain viability, cells must be able to sense and respond to mechanical stimuli. Here, Qi et al. show that the STOML3 protein acts in mechanosensation by binding cholesterol and regulating membrane stiffness which can in turn regulate ion flux through mechanosensitive channels.
- Yanmei Qi
- , Laura Andolfi
- & Jing Hu
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Article
| Open AccessKinesin-5 is a microtubule polymerase
Kinesin-5 is a tetrameric motor that slides antiparallel microtubules during mitotic spindle assembly. Chen and Hancock show that this motor also promotes microtubule assembly by stabilising protofilaments at growing plus ends, which results in the formation of banana peel-like structures.
- Yalei Chen
- & William O Hancock
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Article
| Open AccessAcidic phospholipids govern the enhanced activation of IgG-B cell receptor
Adaptive immunity is the memory of previously experienced pathogens, where B cells establish a rapid antibody response upon IgG-B cell receptor activation. Here, Chen et al. show that sequestration of the cytoplasmic domain of mIgG by plasma membrane phospholipids prevents inappropriate activation of IgG-BCR signalling.
- Xiangjun Chen
- , Weiling Pan
- & Wanli Liu
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Article
| Open AccessLoss of KLF14 triggers centrosome amplification and tumorigenesis
Centrosome amplification is common in cancer, but the mechanism is not clear. Here the authors uncover a role for Kruppel-like factor 14 (KLF14) as a transcriptional repressor of polo-like kinase 4 (PLK4); KLF14 depletion correlates with increased PLK4 in human samples and leads to centrosome amplification and tumorigenesis in mice.
- Guangjian Fan
- , Lianhui Sun
- & Chuangui Wang
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Article
| Open AccessTwo-photon fluorescence lifetime imaging of primed SNARE complexes in presynaptic terminals and β cells
Synaptic vesicles are held in a fusion-competent state prior to their rapid release, which is thought to depend upon formation of trans-SNARE complexes. Takahashi et al. directly image this primed state using FLIM/FRET, and demonstrate differences in basal SNARE organization between neurons and β cells.
- Noriko Takahashi
- , Wakako Sawada
- & Haruo Kasai
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Article
| Open AccessMeasuring fast stochastic displacements of bio-membranes with dynamic optical displacement spectroscopy
Precise quantification of stochastic motions of biological membranes is limited by a lack of suitable detection methods. Here Monzelet al. develop dynamic optical displacement spectroscopy to measure stochastic membrane displacements at 20 nm/10 μs spatiotemporal resolution.
- C. Monzel
- , D. Schmidt
- & R. Merkel
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Article
| Open AccessNeuronal activity regulates remyelination via glutamate signalling to oligodendrocyte progenitors
Myelin regeneration can occur spontaneously in demyelinating diseases but the underlying mechanisms are incompletely understood. Here the authors show that neuronal activity and glutamatergic synapses instruct oligodendrocyte progenitor cells to differentiate into new myelinating oligodendrocytes.
- Hélène O. B. Gautier
- , Kimberley A. Evans
- & Ragnhildur T Káradóttir
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Article
| Open AccessStonin1 mediates endocytosis of the proteoglycan NG2 and regulates focal adhesion dynamics and cell motility
Signalling is often fine-tuned by the exo-endocytic cycling of cell surface receptors. Here, the authors show that the endocytic adaptor protein Stonin1 is important for the endocytosis of NG2, a co-receptor for extracellular matrix and growth factors, and that loss of Stonin1 alters cell motility.
- Fabian Feutlinske
- , Marietta Browarski
- & Tanja Maritzen
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Article
| Open AccessA nanobuffer reporter library for fine-scale imaging and perturbation of endocytic organelles
Endocytic organelles are a dynamic continuum of vacuolar structures that impact various cell physiological processes. Here, the authors report a library of ultra-pH sensitive fluorescent nanoparticles for the controlled perturbation and quantification of catabolic organelle maturation at organelle resolution.
- Chensu Wang
- , Yiguang Wang
- & Jinming Gao
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Article
| Open AccessMAP4K family kinases act in parallel to MST1/2 to activate LATS1/2 in the Hippo pathway
A variety of signals have been reported to either activate or inhibit the Hippo kinase cascade. Here, Meng et al. show that mitogen activated protein kinase kinase kinase kinase (MAP4K) family members function in parallel to and are partially redundant with MST1/2 in regulating LATS in response to upstream signals.
- Zhipeng Meng
- , Toshiro Moroishi
- & Kun-Liang Guan
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Article
| Open AccessmiR-142-5p and miR-130a-3p are regulated by IL-4 and IL-13 and control profibrogenic macrophage program
Fibroblast activity is regulated by tissue macrophages. Here the authors show that two miRNAs regulated by IL-4 and IL-13 in macrophages target SOCS1 and PPARγ and modulate profibrogenic macrophage program in vitro and in vivo, and that alterations of these miRNAs are found in fibrosis.
- Shicheng Su
- , Qiyi Zhao
- & Erwei Song
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Article
| Open AccessNotch signal strength controls cell fate in the haemogenic endothelium
It is unclear how Notch1 signals regulate both the maintenance of the endothelial fate and the endothelial-to-hematopoietic transition in the embryonic aorta. Here the authors show that those cells in which Notch1 ligand Jag1 is out-competed by Dll4 remain endothelial, while higher Jag1 activity leads to generation of hematopoietic stem cells.
- Leonor Gama-Norton
- , Eva Ferrando
- & Anna Bigas
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Article
| Open AccessSiR–Hoechst is a far-red DNA stain for live-cell nanoscopy
Existing DNA stains for live cell microscopy are either toxic, require illumination with blue light, or are not compatible with super-resolution microscopy. Here the authors develop SiRHoechst, a non-toxic far-red DNA stain that is compatible with super-resolution microscopy.
- Gražvydas Lukinavičius
- , Claudia Blaukopf
- & Kai Johnsson
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Article
| Open AccessDefective sister chromatid cohesion is synthetically lethal with impaired APC/C function
Cohesion is associated with many forms of cancer. De Lange et al. show that such cohesion defects can sensitise cells to apoptosis in response to a new APC/C ubiquitin ligase inhibitor, by prolonging mitotic arrest and checkpoint activation due to cohesion fatigue.
- Job de Lange
- , Atiq Faramarz
- & Rob M. F. Wolthuis
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Article
| Open AccessThe structural basis of Miranda-mediated Staufen localization during Drosophila neuroblast asymmetric division
The scaffold protein Miranda is required for the asymmetric segregation of the RNA binding protein Staufen to ganglion mother cells during Drosophila neuroblast division. Jia et al. map the interaction between these proteins and present a crystal structure of the interacting domains.
- Min Jia
- , Zelin Shan
- & Wenning Wang
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Article
| Open AccessA RIAM/lamellipodin–talin–integrin complex forms the tip of sticky fingers that guide cell migration
The leading edge of migrating cells contains activated integrins associated with growing actin filaments that form ‘sticky fingers’ to guide cell migration. Here, the authors detect a complex of MRL proteins, talin and activated integrins in lamellipodia and filopodia in living cells, comprising the tips of the ‘sticky fingers’.
- Frederic Lagarrigue
- , Praju Vikas Anekal
- & Mark H. Ginsberg
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Article
| Open AccessBAP1 promotes breast cancer cell proliferation and metastasis by deubiquitinating KLF5
The zinc finger-containing transcription factor KLF5 drives cell proliferation and migration. Here, the authors show that the debuquitinase BAP1 directly stabilizes KLF5, thus promoting basal-like breast cancer cell-cycle progression and metastasis.
- Junying Qin
- , Zhongmei Zhou
- & Ceshi Chen
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Article
| Open AccessInterplay between arginine methylation and ubiquitylation regulates KLF4-mediated genome stability and carcinogenesis
Krüppel-like factor 4 plays an important role in regulating responses to DNA damage, cell-fate decision and apoptosis. Here the authors show that aberrant regulation by methyltransferase PRMT5 results in failure to arrest the cell cycle and genome instability, pointing to a role in carcinogenesis.
- Dong Hu
- , Mert Gur
- & Yong Wan
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Article
| Open AccessLocalization of Hippo signalling complexes and Warts activation in vivo
Components of the Hippo signalling pathway localize to apical junctions in epithelial cells, where they regulate growth in response to mechanical and biochemical cues. Sun et al. show that these proteins are organized into distinct junctional complexes, which reorganize up on Hippo pathway activation.
- Shuguo Sun
- , B. V. V. G. Reddy
- & Kenneth D. Irvine
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Article
| Open AccessA recursive vesicle-based model protocell with a primitive model cell cycle
The synthetic production of model protocells, which represent potential intermediates between nonliving material and living cells, may help to explain the origin of cellular life. Here, Kuriharaet al. develop a giant vesicle-based model protocell that is able to self-proliferate recursively in response to external stimuli.
- Kensuke Kurihara
- , Yusaku Okura
- & Tadashi Sugawara
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Article
| Open AccessA resilient formin-derived cortical actin meshwork in the rear drives actomyosin-based motility in 2D confinement
Amoeboid motility is driven by actomyosin-based contraction and exploits differences in the mechanical properties of the cortical cytoskeleton. Here the authors discover that mDia1-like formin A is responsible for generating a subset of actin filaments at the rear of Dictyosteliumthat suppresses lateral protrusions and blebbing during 2D-confined migration.
- Nagendran Ramalingam
- , Christof Franke
- & Jan Faix
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Article
| Open AccessGenomic analyses reveal recurrent mutations in epigenetic modifiers and the JAK–STAT pathway in Sézary syndrome
Sézary syndrome is a T cell malignancy that has been poorly characterized at the genome level. In this study, Kielet al. perform whole-genome analyses and identify mutations in the JAK–STAT pathway and show that primary cells are sensitive to JAK inhibitors.
- Mark J. Kiel
- , Anagh A. Sahasrabuddhe
- & Kojo S. J. Elenitoba-Johnson
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Article
| Open AccessStructure of the native Sec61 protein-conducting channel
The protein-conducting channel Sec61 is responsible for protein transport and membrane insertion at the endoplasmic reticulum. Here, the authors determine the structure of ribosome-bound Sec61 in a native context, in which it adopts a laterally open conformation, irrespective of its functional state.
- Stefan Pfeffer
- , Laura Burbaum
- & Friedrich Förster
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Article |
NACA deficiency reveals the crucial role of somite-derived stromal cells in haematopoietic niche formation
How do stromal cells contribute to the haematopoietic stem cell (HSC) niche? In zebrafish, Murayama et al. identify somite-derived stromal cells in the first niche where HSCs home, and depletion of the nascent polypeptide-associated complex alpha subunit in these cells prevents HSC maturation.
- Emi Murayama
- , Milka Sarris
- & Philippe Herbomel
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Article
| Open AccessCPI motif interaction is necessary for capping protein function in cells
Capping protein regulates actin filament dynamics by binding to barbed ends and preventing their growth. Edwards et al. show that capping protein also requires interactions with proteins containing a capping protein interaction motif to promote its proper localization and regulation of actin dynamics.
- Marc Edwards
- , Patrick McConnell
- & John A. Cooper
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Article
| Open AccessOptodynamic simulation of β-adrenergic receptor signalling
Optogenetic activation of β2-adrenergic receptors (β2-AR) has been achieved, but not characterized in detail. Here, Siudaet al. show that light-controlled opto-β2AR mimics endogenous β2AR activity in vitro and in vivo, and develop novel, optically active, functionally selective receptors to bias β2AR intracellular signaling mechanisms.
- Edward R. Siuda
- , Jordan G. McCall
- & Michael R. Bruchas
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Article
| Open AccessTrkB/BDNF signalling patterns the sympathetic nervous system
The signals that pattern the sympathetic nervous system are not fully understood. Here the authors show that the dorsal migration of the primary sympathetic ganglia in chick embryos is orchestrated by BDNF/TrkB signalling and requires contact with preganglionic axons.
- Jennifer C. Kasemeier-Kulesa
- , Jason A. Morrison
- & Paul M. Kulesa
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Article
| Open AccessEZH2-mediated loss of miR-622 determines CXCR4 activation in hepatocellular carcinoma
Chemokines and their receptors have key roles in tumorigenesis. Here, the authors demonstrate that CXRC4 is overexpressed in hepatocellular carcinoma and is associated with poor prognosis and, mechanistically CXCR4 is increased in expression via EZH2 repression of microRNA-622.
- Haiou Liu
- , Yidong Liu
- & Jiejie Xu
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Article |
Evolutionarily conserved intercalated disc protein Tmem65 regulates cardiac conduction and connexin 43 function
Mechanical and electrical activity in the heart is propagated through unique cardiomyocyte membrane structures, the intercalated discs (ID). Sharma et al.identify a novel ID protein, Tmem65, that controls Ca2+ signalling and electrical coupling by interacting with and functionally regulating the gap junction protein Cx43.
- Parveen Sharma
- , Cynthia Abbasi
- & Anthony O. Gramolini
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Article |
TET2 repression by androgen hormone regulates global hydroxymethylation status and prostate cancer progression
The epigenetic mark 5-hmC alters gene expression and is known to be regulated by TET proteins. Here, the authors show that 5-hmC and TET2 are reduced in prostate cancer via androgen receptor-dependent miRNA expression and are inversely correlated with prognosis.
- Ken-ichi Takayama
- , Aya Misawa
- & Satoshi Inoue
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Article
| Open AccessBub1 autophosphorylation feeds back to regulate kinetochore docking and promote localized substrate phosphorylation
Bub1 kinase phosphorylates histone H2A-T120 at the centromere to recruit shugoshin proteins and promote sister chromatid cohesion during mitosis. Here the authors show that Bub1 autophosphorylation on T589 influences Bub1 dynamics at the kinetochore and restricts H2A-T120 phosphorylation to centromeres.
- Adeel Asghar
- , Audrey Lajeunesse
- & Sabine Elowe
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Article
| Open AccessPTEN regulates cilia through Dishevelled
The formation of motile cilia is regulated by Dishevelled (DVL), a central component in WNT signalling and planar cell polarity (PCP). Here the authors identify DVL as a novel substrate of the phosphatase PTEN, coupling PTEN to cilia dynamics and PCP.
- Iryna Shnitsar
- , Mikhail Bashkurov
- & Miriam Barrios-Rodiles
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Article
| Open AccessO-GlcNAcylation of G6PD promotes the pentose phosphate pathway and tumor growth
The pentose phosphate pathway is aberrantly activated in cancer cells but the mechanism is unclear. Here, the authors show that G6PD, the rate-limiting enzyme in the pathway, is post-translationally modified with a sugar moiety under hypoxic conditions leading to increased production of precursors for macromolecular synthesis and antioxidants.
- Xiongjian Rao
- , Xiaotao Duan
- & Wen Yi
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Article
| Open AccessDiffusional spread and confinement of newly exocytosed synaptic vesicle proteins
Neurotransmission is mediated by synaptic vesicles (SVs) fusion with the plasma membrane near active zones. Here, Gimber et al.observe that rapid diffusional spread and confinement is followed by slow reclustering of SV proteins at the periactive endocytic zone through SV protein association with the clathrin-based machinery.
- Niclas Gimber
- , Georgi Tadeus
- & Volker Haucke
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Article
| Open AccessMatrikines are key regulators in modulating the amplitude of lung inflammation in acute pulmonary infection
Proteases degrade extracellular matrix during inflammation, releasing peptides that can recruit neutrophils. Here the authors show that degradation of such bioactive peptide by the enzyme leukotriene A4 hydrolase is critical to limit pulmonary inflammation during bacterial infection in mice.
- Samia Akthar
- , Dhiren F. Patel
- & Robert J. Snelgrove
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Article
| Open AccessSTIM1 dimers undergo unimolecular coupling to activate Orai1 channels
STIM1, the endoplasmic reticulum calcium sensor, is activated in response to calcium store depletion and translocates to the ER–plasma membrane junctions to activate Orai1 channels. Here the authors present a new model of unimolecular coupling between STIM1 and Orai1 whereby STIM1 dimers may be involved in crosslinking Orai1 channels.
- Yandong Zhou
- , Xizhuo Wang
- & Donald L. Gill
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Article
| Open AccessWnt signalling tunes neurotransmitter release by directly targeting Synaptotagmin-1
The mechanisms by which signalling proteins dynamically modulate neurotransmitter release remain poorly understood. Here, Cianiet al. show Wnt signalling influences vesicle pool availability in an activity-dependent manner via direct interactions with Dishevelled-1 and the synaptic vesicle calcium sensor Synaptotagmin-1.
- Lorenza Ciani
- , Aude Marzo
- & Patricia C. Salinas
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Article
| Open AccessSETD1A modulates cell cycle progression through a miRNA network that regulates p53 target genes
The p53-inducible antiproliferative gene BTG2 is suppressed in many cancers, in the absence of inactivating gene mutations. Here the authors show that the histone lysine methyltransferase SETD1A suppresses the expression of several p53 target genes including BTG2by inducing a network of microRNAs.
- Ken Tajima
- , Toshifumi Yae
- & Shyamala Maheswaran
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Article
| Open AccessCalcium ions open a selectivity filter gate during activation of the MthK potassium channel
Ion channels open and close to allow the regulated passage of ions through the membrane. Here the authors use selective ion channel blockers to analyse this regulation in a potassium channel and show that the gate is in the selectivity filter, past the entrance to the channel.
- David J. Posson
- , Radda Rusinova
- & Crina M. Nimigean
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Article
| Open AccessDirect quantitative detection of Doc2b-induced hemifusion in optically trapped membranes
Membrane fusion in cells is triggered by an increase in Ca2+ and involves SNARE complexes and calcium-sensing proteins, but the mechanism underlying the Ca2+-sensors’ role in fusion remains unclear. Here the authors show in vitro that the Ca2+-sensor Doc2b acts directly on membranes and induces a hemifusion intermediate in the presence of calcium.
- Ineke Brouwer
- , Asiya Giniatullina
- & Alexander J. Groffen
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Article
| Open AccessReal-time fluorescence imaging with 20 nm axial resolution
Mapping the nanoscale height and dynamics of structures within the cell is difficult. Here the authors present a two-wavelength total internal reflection fluorescence method to perform real-time imaging with nanometre axial resolution using a conventional microscope.
- Daniel R. Stabley
- , Thomas Oh
- & Khalid Salaita
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Article
| Open AccessInternational genome-wide meta-analysis identifies new primary biliary cirrhosis risk loci and targetable pathogenic pathways
Primary biliary cirrhosis is an autoimmune liver disease with poor therapeutic options. Here Cordell et al. a perform meta-analysis of European genome-wide association studies identifying six novel risk loci and a number of potential therapeutic pathways.
- Heather J. Cordell
- , Younghun Han
- & Katherine A. Siminovitch
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Article
| Open AccessVertical suppression of the EGFR pathway prevents onset of resistance in colorectal cancers
Cancer patients often respond well to primary treatment but then develop resistance. Here, Misale et al. show that dual treatment with EGFR and MEK inhibitors block resistance in mice containing patient-derived xenografts and provide a mathematical model that describes the temporal development of resistant tumour clones.
- Sandra Misale
- , Ivana Bozic
- & Alberto Bardelli
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Article
| Open AccessClass III PI3K regulates organismal glucose homeostasis by providing negative feedback on hepatic insulin signalling
PI3K is activated as a result of insulin receptor (IR) signalling. Here the authors show that activation of specific class III PI3Ks in response to insulin promotes IR endocytosis and lysosomal degradation, providing negative feedback on IR signalling by reducing the time IR is activated.
- Ivan Nemazanyy
- , Guillaume Montagnac
- & Ganna Panasyuk
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Article
| Open AccessImpaired PIEZO1 function in patients with a novel autosomal recessive congenital lymphatic dysplasia
Lukacs et al. identify mutations in the PIEZO1gene in patients with congenital lymphatic dysplasia. The study also characterizes the functional consequence of the disease-associated Piezo1 mutant proteins and show attenuated ion channel function in cellular context.
- Viktor Lukacs
- , Jayanti Mathur
- & Bryan L. Krock
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Article
| Open AccessHypothalamic PKA regulates leptin sensitivity and adiposity
Mice lacking RIIβ, a regulatory subunit of protein kinase A, are lean and resistant to diet-induced obesity. Here, the authors show that RIIβ regulates leptin sensitivity, acting as a physiological brake on leptin responsiveness and the duration of leptin signalling in the hypothalamus.
- Linghai Yang
- & G. Stanley McKnight
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