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ChromPure Mouse IgG, whole molecule antibody

RRID:AB_2337188

Antibody ID

AB_2337188

Target Antigen

Mouse IgG, whole molecule

Proper Citation

(Jackson ImmunoResearch Labs Cat# 015-000-003, RRID:AB_2337188)

Clonality

unknown

Comments

Originating manufacturer of this product

Vendor

Jackson ImmunoResearch Labs Go To Vendor

Cat Num

015-000-003

MTSS1 Regulation of Actin-Nucleating Formin DAAM1 in Dendritic Filopodia Determines Final Dendritic Configuration of Purkinje Cells.

  • Kawabata Galbraith K
  • Cell Rep
  • 2018 Jul 3

Literature context:


Abstract:

Dendritic filopodia of developing neurons function as environmental sensors, regulating the spatial organization of dendrites and proper targeting to presynaptic partners. Dendritic filopodia morphology is determined by the balance of F-actin assembled via two major nucleating pathways, the ARP2/3 complex and formins. The inverse-BAR protein MTSS1 is highly expressed in Purkinje cells (PCs) and has been shown to upregulate ARP2/3 activity. PCs in MTSS1 conditional knockout mice showed dendrite hypoplasia due to excessive contact-induced retraction during development. This phenotype was concomitant with elongated dendritic filopodia and was phenocopied by overactivation of the actin nucleator formin DAAM1 localized in the tips of PC dendritic protrusions. Cell biology assays including single-molecule speckle microscopy demonstrated that MTSS1's C terminus binds to DAAM1 and paused DAAM1-mediated F-actin polymerization. Thus, MTSS1 plays a dual role as a formin inhibitor and ARP2/3 activator in dendritic filopodia, determining final neuronal morphology.

Funding information:
  • Breast Cancer Now - 2012NOVSP024(United Kingdom)

Analyses of a Mutant Foxp3 Allele Reveal BATF as a Critical Transcription Factor in the Differentiation and Accumulation of Tissue Regulatory T Cells.

  • Hayatsu N
  • Immunity
  • 2017 Aug 15

Literature context:


Abstract:

Foxp3 controls the development and function of regulatory T (Treg) cells, but it remains elusive how Foxp3 functions in vivo. Here, we established mouse models harboring three unique missense Foxp3 mutations that were identified in patients with the autoimmune disease IPEX. The I363V and R397W mutations were loss-of-function mutations, causing multi-organ inflammation by globally compromising Treg cell physiology. By contrast, the A384T mutation induced a distinctive tissue-restricted inflammation by specifically impairing the ability of Treg cells to compete with pathogenic T cells in certain non-lymphoid tissues. Mechanistically, repressed BATF expression contributed to these A384T effects. At the molecular level, the A384T mutation altered Foxp3 interactions with its specific target genes including Batf by broadening its DNA-binding specificity. Our findings identify BATF as a critical regulator of tissue Treg cells and suggest that sequence-specific perturbations of Foxp3-DNA interactions can influence specific facets of Treg cell physiology and the immunopathologies they regulate.

TCF7L1 promotes skin tumorigenesis independently of β-catenin through induction of LCN2.

  • Ku AT
  • Elife
  • 2017 May 3

Literature context:


Abstract:

The transcription factor TCF7L1 is an embryonic stem cell signature gene that is upregulated in multiple aggressive cancer types, but its role in skin tumorigenesis has not yet been defined. Here we document TCF7L1 upregulation in skin squamous cell carcinoma (SCC) and demonstrate that TCF7L1 overexpression increases tumor incidence, tumor multiplicity, and malignant progression in the chemically induced mouse model of skin SCC. Additionally, we show that downregulation of TCF7L1 and its paralogue TCF7L2 reduces tumor growth in a xenograft model of human skin SCC. Using separation-of-function mutants, we show that TCF7L1 promotes tumor growth, enhances cell migration, and overrides oncogenic RAS-induced senescence independently of its interaction with β-catenin. Through transcriptome profiling and combined gain- and loss-of-function studies, we identified LCN2 as a major downstream effector of TCF7L1 that drives tumor growth. Our findings establish a tumor-promoting role for TCF7L1 in skin and elucidate the mechanisms underlying its tumorigenic capacity.

Funding information:
  • NCI NIH HHS - P30 CA016672()
  • NCI NIH HHS - P30 CA125123()
  • NCI NIH HHS - R01 CA194062()
  • NCI NIH HHS - R01 CA194617()
  • NCRR NIH HHS - S10 RR024574()
  • NHLBI NIH HHS - T32 HL092332()
  • NIAID NIH HHS - P30 AI036211()
  • NIDCD NIH HHS - R01 DC00189.(United States)
  • NIGMS NIH HHS - T32 GM088129()

PDZD7-MYO7A complex identified in enriched stereocilia membranes.

  • Morgan CP
  • Elife
  • 2016 Aug 15

Literature context:


Abstract:

While more than 70 genes have been linked to deafness, most of which are expressed in mechanosensory hair cells of the inner ear, a challenge has been to link these genes into molecular pathways. One example is Myo7a (myosin VIIA), in which deafness mutations affect the development and function of the mechanically sensitive stereocilia of hair cells. We describe here a procedure for the isolation of low-abundance protein complexes from stereocilia membrane fractions. Using this procedure, combined with identification and quantitation of proteins with mass spectrometry, we demonstrate that MYO7A forms a complex with PDZD7, a paralog of USH1C and DFNB31. MYO7A and PDZD7 interact in tissue-culture cells, and co-localize to the ankle-link region of stereocilia in wild-type but not Myo7a mutant mice. Our data thus describe a new paradigm for the interrogation of low-abundance protein complexes in hair cell stereocilia and establish an unanticipated link between MYO7A and PDZD7.