Professor
          Cell and Tissue Biology
          +1 415 717-7117
      The Barber Lab addresses questions on the fundamental cell biology of epithelial plasticity to understand dysregulated functions in human diseases. Our primary focus on how pHi dynamics regulates cancer cell behaviors such as migration and metabolic reprogramming and stem cell behaviors and lineage specification bridges protein electrostatics with cell biology, revealing protonation as a post-translational modification regulating protein conformations and functions. Our secondary focus on the regulation of actin filament dynamics and architectures includes revealing regulatory mechanisms and roles in transformation, stem cell differentiation, and epithelial to mesenchymal transition.
Publications
A role for pH dynamics regulating transcription factor DNA binding selectivity
Nucleic acids research
      
            
      
      A role for pH dynamics regulating transcription factor DNA-binding selectivity.
Nucleic acids research
      
            
      
      Patient-derived Induced Pluripotent Stem Cells as a Model to Study Frontotemporal Dementia Pathologies.
bioRxiv : the preprint server for biology
      
            
      
      Arp2/3 complex activity enables nuclear YAP for naïve pluripotency of human embryonic stem cells.
eLife
      
            
      
      A role for pH dynamics regulating transcription factor DNA binding selectivity.
bioRxiv : the preprint server for biology
      
            
      
      Intracellular pH dynamics regulates intestinal stem cell lineage specification.
Nature communications
      
            
      
      pH dynamics regulates transcription factor-DNA binding.
Biophysical Journal
      
            
      
      Arp2/3 complex activity is necessary for mouse ESC differentiation, times formative pluripotency, and enables lineage specification.
Stem cell reports
      
            
      
      Ethyl Isopropyl Amiloride Decreases Oxidative Phosphorylation and Increases Mitochondrial Fusion in Clonal Untransformed and Cancer Cells.
American journal of physiology. Cell physiology
      
            
      
      pHLARE: A New Biosensor Reveals Decreased Lysosome pH in Cancer Cells.
Molecular biology of the cell
      
            
      
      An acidic residue buried in the dimer interface of isocitrate dehydrogenase 1 (IDH1) helps regulate catalysis and pH sensitivity.
The Biochemical journal
      
            
      
      Intracellular pH Regulates Cancer and Stem Cell Behaviors: A Protein Dynamics Perspective.
Frontiers in oncology
      
            
      
      Editorial overview: Cell dynamics: Integrating cell dynamics across scales.
Current opinion in cell biology
      
            
      
      Filament assembly by the liver phosphofructokinase-1, the “gatekeeper” of glycolysis.
The FASEB Journal
      
            
      
      Intracellular pH dynamics and charge-changing somatic mutations in cancer.
Cancer metastasis reviews
      
            
      
      Drosophila anion exchanger 2 is required for proper ovary development and oogenesis.
Developmental biology
      
            
      
      Tau repeat regions contain conserved histidine residues that modulate microtubule-binding in response to changes in pH.
The Journal of biological chemistry
      
            
      
      ß-Catenin is a pH sensor with decreased stability at higher intracellular pH.
The Journal of cell biology
      
            
      
      Formin-dependent TGF-ß signaling for epithelial to mesenchymal transition.
Molecular biology of the cell
      
            
      
      The Glycolytic Enzyme Phosphofructokinase-1 Assembles into Filaments.
Biophysical Journal
      
            
      
      Cancer-associated arginine-to-histidine mutations confer a gain in pH sensing to mutant proteins.
Science signaling
      
            
      
      The glycolytic enzyme phosphofructokinase-1 assembles into filaments.
The Journal of cell biology
      
            
      
      Cancer cell behaviors mediated by dysregulated pH dynamics at a glance.
Journal of cell science
      
            
      
      Increased intracellular pH is necessary for adult epithelial and embryonic stem cell differentiation.
The Journal of cell biology
      
            
      
      A Histidine Cluster in the Cytoplasmic Domain of the Na-H Exchanger NHE1 Confers pH-sensitive Phospholipid Binding and Regulates Transporter Activity.
The Journal of biological chemistry
      
            
      
      Structures of Human Phosphofructokinase-1 and Atomic Basis of Cancer-Associated Mutations.
Biophysical Journal
      
            
      
      Abstract B65: Dissecting the tumor myeloid compartment reveals rare activating antigen presenting cells, critical for T cell immunity.
Tumor Microenvironment
      
            
      
      Hypoxia increases the abundance but not the assembly of extracellular fibronectin during epithelial cell transdifferentiation.
Journal of cell science
      
            
      
      The Nck-interacting kinase NIK increases Arp2/3 complex activity by phosphorylating the Arp2 subunit.
The Journal of cell biology
      
            
      
      Filament Assembly by Phosphofructokinase-1, the Gatekeeper of Glycolysis.
Biophysical Journal
      
            
      
      Ratiometric imaging of pH probes.
Methods in cell biology
      
            
      
      pH Sensing by FAK-His58 Regulates Focal Adhesion Remodeling.
The Journal of General Physiology
      
            
      
      pH sensing by FAK-His58 regulates focal adhesion remodeling.
The Journal of cell biology
      
            
      
      Electrostatics control actin filament nucleation and elongation kinetics.
The Journal of biological chemistry
      
            
      
      Considering protonation as a posttranslational modification regulating protein structure and function.
Annual review of biophysics
      
            
      
      Phosphorylation of actin-related protein 2 (Arp2) is required for normal development and cAMP chemotaxis in Dictyostelium.
The Journal of biological chemistry
      
            
      
      Characterization of cytoskeletal protein 4.1R interaction with NHE1 (Na(+)/H(+) exchanger isoform 1).
The Biochemical journal
      
            
      
      Phosphorylation of the Arp2 subunit relieves auto-inhibitory interactions for Arp2/3 complex activation.
PLoS computational biology
      
            
      
      Dynamic actin remodeling during epithelial-mesenchymal transition depends on increased moesin expression.
Molecular biology of the cell
      
            
      
      Dysregulated pH: a perfect storm for cancer progression.
Nature reviews. Cancer
      
            
      
      A human MAP kinase interactome.
Nature methods
      
            
      
      Nuclear-localized calcineurin homologous protein CHP1 interacts with upstream binding factor and inhibits ribosomal RNA synthesis.
The Journal of biological chemistry
      
            
      
      Expression of actin-interacting protein 1 suppresses impaired chemotaxis of Dictyostelium cells lacking the Na+-H+ exchanger NHE1.
Molecular biology of the cell
      
            
      
      Molecular Dynamics Simulations Predict A pH-Dependent Conformational Change in the C-Helix of Cell Cycle Checkpoint Kinase Wee1.
Biophysical Journal
      
            
      
      The sodium-hydrogen exchanger NHE1 is an Akt substrate necessary for actin filament reorganization by growth factors.
The Journal of biological chemistry
      
            
      
      Mislocalized scaffolding by the Na-H exchanger NHE1 dominantly inhibits fibronectin production and TGF-beta activation.
Molecular biology of the cell
      
            
      
      Cofilin is a pH sensor for actin free barbed end formation: role of phosphoinositide binding.
The Journal of cell biology
      
            
      
      Structural model and functional significance of pH-dependent talin-actin binding for focal adhesion remodeling.
Proceedings of the National Academy of Sciences of the United States of America
      
            
      
      Phosphorylation of the Arp2/3 complex is necessary to nucleate actin filaments.
The Journal of cell biology
      
            
      
      Actin co-sedimentation assay; for the analysis of protein binding to F-actin.
Journal of visualized experiments : JoVE
      
            
      
      Positive feedback between Cdc42 activity and H+ efflux by the Na-H exchanger NHE1 for polarity of migrating cells.
The Journal of cell biology
      
            
      
      Beyond ion translocation: structural functions of the sodium-hydrogen exchanger isoform-1.
Current opinion in nephrology and hypertension
      
            
      
      Intracellular pH sensors: design principles and functional significance.
Physiology (Bethesda, Md.)
      
            
      
      The Nck-interacting kinase phosphorylates ERM proteins for formation of lamellipodium by growth factors.
Proceedings of the National Academy of Sciences of the United States of America
      
            
      
      A developmentally regulated Na-H exchanger in Dictyostelium discoideum is necessary for cell polarity during chemotaxis.
The Journal of cell biology
      
            
      
      Na(+)/H(+) exchanger NHE1 as plasma membrane scaffold in the assembly of signaling complexes.
American journal of physiology. Cell physiology
      
            
      
      Na-H exchange-dependent increase in intracellular pH times G2/M entry and transition.
The Journal of biological chemistry
      
            
      
      Conserved motifs in somatostatin, D2-dopamine, and alpha 2B-adrenergic receptors for inhibiting the Na-H exchanger, NHE1.
The Journal of biological chemistry
      
            
      
      Cell migration requires both ion translocation and cytoskeletal anchoring by the Na-H exchanger NHE1.
The Journal of cell biology
      
            
      
      Somatostatin, acting at receptor subtype 1, inhibits Rho activity, the assembly of actin stress fibers, and cell migration.
The Journal of biological chemistry
      
            
      
      Ion transport proteins anchor and regulate the cytoskeleton.
Current opinion in cell biology
      
            
      
      The changing face of the Na+/H+ exchanger, NHE1: structure, regulation, and cellular actions.
Annual review of pharmacology and toxicology
      
            
      
      TEL-JAK2 mediates constitutive activation of the phosphatidylinositol 3'-kinase/protein kinase B signaling pathway.
The Journal of biological chemistry
      
            
      
      The Nck-interacting kinase (NIK) phosphorylates the Na+-H+ exchanger NHE1 and regulates NHE1 activation by platelet-derived growth factor.
The Journal of biological chemistry
      
            
      
      A minimal cytoplasmic subdomain of the erythropoietin receptor mediates p70 S6 kinase phosphorylation.
Experimental hematology
      
            
      
      The SH2 inositol 5-phosphatase Ship1 is recruited in an SH2-dependent manner to the erythropoietin receptor.
The Journal of biological chemistry
      
            
      
      Effect of Rho GTPases on Na-H exchanger in mammalian cells.
Methods in enzymology
      
            
      
      Inhibition of calcineurin phosphatase activity by a calcineurin B homologous protein.
The Journal of biological chemistry
      
            
      
      Fusion of the ets transcription factor TEL to Jak2 results in constitutive Jak-Stat signaling.
Blood
      
            
      
      p160ROCK mediates RhoA activation of Na-H exchange.
The EMBO journal
      
            
      
      Na-H exchange acts downstream of RhoA to regulate integrin-induced cell adhesion and spreading.
Molecular biology of the cell
      
            
      
      Maintenance of human T cell anergy: blocking of IL-2 gene transcription by activated Rap1.
Science (New York, N.Y.)
      
            
      
      Activation of Na+-H+ exchange is necessary for RhoA-induced stress fiber formation.
Journal of Biological Chemistry
      
            
      
      A calcineurin homologous protein inhibits GTPase-stimulated Na-H exchange.
Proceedings of the National Academy of Sciences of the United States of America
      
            
      
      The cytokine-activated tyrosine kinase JAK2 activates Raf-1 in a p21ras-dependent manner.
Proceedings of the National Academy of Sciences of the United States of America
      
            
      
      Activation of Na+-H+ exchange is necessary for RhoA-induced stress fiber formation.
The Journal of biological chemistry
      
            
      
      Galpha12 differentially regulates Na+-H+ exchanger isoforms.
The Journal of biological chemistry
      
            
      
      G alpha 13 stimulates Na+-H+ exchange through distinct Cdc42-dependent and RhoA-dependent pathways.
The Journal of biological chemistry
      
            
      
      [12] Regulation of Na+-H+ exchange by G protein-coupled receptors.
Receptor Molecular Biology
      
            
      
      The Fanconi anemia polypeptide FACC is localized to the cytoplasm.
Proceedings of the National Academy of Sciences of the United States of America
      
            
      
      Subtype-specific signaling mechanisms of somatostatin receptors SSTR1 and SSTR2.
The Journal of biological chemistry
      
            
      
      A dominant negative erythropoietin (EPO) receptor inhibits EPO-dependent growth and blocks F-gp55-dependent transformation.
Molecular and cellular biology
      
            
      
      G alpha 13 stimulates Na-H exchange.
The Journal of biological chemistry
      
            
      
      Guanine nucleotides regulate beta-adrenergic activation of Na-H exchange independently of receptor coupling to Gs.
The Journal of biological chemistry
      
            
      
      The erythropoietin receptor and the molecular basis of signal transduction.
Seminars in hematology
      
            
      
      Mutant constructs of the beta-adrenergic receptor that are uncoupled from adenylyl cyclase retain functional activation of Na-H exchange.
Molecular pharmacology
      
            
      
      Fatty acids stereospecifically stimulate neurotensin release and increase [Ca2+]i in enteric endocrine cells.
The American journal of physiology
      
            
      
      Mechanisms of receptor-mediated regulation of Na-H exchange.
Cellular signalling
      
            
      
      Multiple receptors coupled to adenylate cyclase regulate Na-H exchange independent of cAMP.
The Journal of biological chemistry
      
            
      
      Beta-adrenergic and somatostatin receptors regulate Na-H exchange independent of cAMP.
The Journal of biological chemistry
      
            
      
      Canine enteric submucosal cultures: transmitter release from neurotensin-immunoreactive neurons.
Neuroscience
      
            
      
      Somatostatin and muscarinic inhibition of canine enteric endocrine cells: cellular mechanisms.
The American journal of physiology
      
            
      
      Morphologic and physiologic studies of canine ileal enteroglucagon-containing cells in short-term culture.
Gastroenterology
      
            
      
      Cloning and sequence analysis of cDNA for the canine neurotensin/neuromedin N precursor.
Proceedings of the National Academy of Sciences of the United States of America
      
            
      
      Neurotensin-containing neurons in the canine enteric innervation.
Neuroscience letters
      
            
      
      Isolated canine ileal mucosal cells in short-term culture: a model for study of neurotensin release.
The American journal of physiology
      
            
      
      Regulation of neurotensin release from canine enteric primary cell cultures.
The American journal of physiology