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2016年5月10日 星期二

Cell-Surface Vimentin Monoclonal Antibody

Vimentin, a 57kDa type III intermediate filament, is responsible for architecture of cytoplasm.1 As a popular intracellular epithelial mesenchymal transition (EMT) marker, overexpression of vimentin in cancer cells was known for its high correlation with cancer progression. Apart from secretion under some circumstances, vimentin can also be recruited to the cell surface, known as cell surface vimentin (CSV), to participate in cell adhesion, migration and cellular signaling.2

The significance of CSV is related to its involvement in autoimmune disorders, viral infection and cancer. CSV expression on activated marcophages, platelets and apoptotic T lymphocytes evidenced its connection to human neutrophil spontaneous apoptosis further supports its association with inflammatory diseases.3 Being a putative anti-viral drug target, CSV also takes parts in viral multiplication by directly facilitate internalization of virion.4 Recently, breakthroughs on identifying CSV as cancer specific EMT marker, in association with metastatic phenotypes in aggressive cancer and sarcoma, has made an impact on cancer research community. Because unlike intracellular vimentin, the cell surface detection of CSV enables the isolation of cancer cells.5,6,7

Abnova obtains worldwide exclusive license of the patented CSV monoclonal antibody, clone 84-1, from MD Anderson Cancer Center, United States. This antibody has been validated for its intended use in majorities of cancer cell lines by both immunofluoresence and flow cytometry.8 As a sole provider for this powerful tool, Abnova hopes to propel the investigations on cancer research with specificity and broad applicability.

CSV monoclonal antibody, clone 84-1
H00007431-M08


CSV Expression in Different Cell Lines8
Cell Line CSV Cell Line CSV Cell Line CSV
Breast   Bone   Liver  
  MCF-7 (H) +   OS-25 (H) ++   AMC14 (M) ++
  SKBR3 (H) +   HOS (H) ++ Colon  
  MDA-MB-231 (H) +   MG-263 (H) ++   DLD-1 (H) ++
  MDA-MB-453 (H) +   LM7 (H) +   GEO (H) ++
  MDA-MB-458 (H) ++   SAOS-2 (H) +   OS-187 (H) ++
  4T1 (M) +   OS25 (H) +   SW620 (H) +
Brain     OS-O (H) ++   SW480 (H) +
  SKNAS (H) ++   OS-D (H) +   HCT-116 (H) +
  SKNBE2 (H) +++   U2OS (H) +   HT-29 (H) ++
  NGP (H) +   CCH-OSD (H) +   Caco-2 (H) +
  SH-SY5Y (H) ++   K7 (M) ++   CT-26 (M) +
  LAN5 (H) ++   K7M2 (M) +++ Pancreas  
  KCN (H) +   DUNN (M) +   PANC-1 (H) ++
  DBT (M) +   LM8 (M) +++   MiaPACA-2 (H) +
  U251 (H) +   OST-DL-391 + Other  
Bladder     OST-DL-393 +   FBL3 (M) +++
  RT4V6 (H) +   OST-DL-396a ++   SCCVII (M) +
  T24 (H) ++        

Flow Cytometry Using CSV monoclonal antibody, clone 84-1 (H00007431-M08)
CSV Expression in Cancer Cell Lines
Immunological assessment of CSV in various cancer cell lines and normal cell lines using flow cytometry in which only cancer cells, including GEO (colorectal cancer), MDA-MB-231 (breast cancer) and PANC-1 (pancreatic cancer) can be detected by CSV, 84-1.6
CSV Expression in Sarcoma Cell Lines
Immunological assessment of CSV in various cancer cell lines and normal cell lines using flow cytometry in which only cancer cells, including SKNBE-2 (neuroblastoma), RH-41 (rhabdomyosarcoma) and LM7 (osteosarcoma) can be detected by CSV, 84-1.5
Sorting of Hepatocellular Carcinoma Cells (HCC)
Stem-cell liked cancer cell populations, csVim+ CD133- and csVim- CD133+, were isolated and sorted into sub-G1, G1, S and G2 phases from primary HCC using CSV, 84-1.7

Immunofluorescence Using CSV monoclonal antibody, clone 84-1 (H00007431-M08)
Analysis of CSV-specific 84-1 monoclonal antibody
Cell surface staining of CSV in LM7 (osteosarcoma) cancer cell line using confocal microscopy. Cells were stained for CSV (green), WGA (red) and nucleus DRAQ5 (blue). CSV monoclonal antibody 84-1 co-localized with WGA indicated cell surface vimentin.5
Detection of CSV in HPC-1-derived Spheres on Geltrex-coated Wells
Vimentin (green) was detected at the periphery of 3-dimensional HPC-derived sphere model. Since cells at periphery were more aggressive, the invasivephenotype correlated with increase nuclear accumulation of β-catenin (red).6
Detection of CSV on Human Colorectal Cancer Cells
Circulating tumor cells derived from colorectal cancer patients were stained for nucelus (blue), cell surface vimentin (green) and specific EMT biomarkers (red), including FOXC2, TWIST-2, SNAIL, SLUG, EpCAM and E-cadherin.6

References
1. Mitra, A. and Li, S. (2014). J Cancer Prev Curr Res. DOI: 10.15406/jcpcr.2014.01.00014
2. Satelli, A. and Li, S. (2011). Cell Mol Life Sci. DOI: 10.1007/s00018-011-0735-1
3. Moisan, E. and Girard, D. (2005). JLB. DOI:10.1189/jlb.0405190
4. Yu, YT., et. al. (2016). Journal of Biomedical Science. DOI: 10.1186/s12929-016-0234-7
5. Satelli A., et al. (2014). Cancer Research. DOI:10.1158/0008-5472.CAN-13-1739.
6. Satelli A., et al. (2014). Clinical Cancer Research. DOI:10.1158/1078-0432.CCR-14-0894.
7. Mitra, A., et al. (2015). IJC. DOI:10.1002/ijc.29382.
8. Satelli A. (2014). WIPO. WO 2014/138183 A1.

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2016年4月8日 星期五

RAS Signaling Cancer Research

New Discoveries on RAS Signaling Cancer Research
  • ERK inhibitor alone can suppress the growth of KRAS-mutant pancreatic cancer cell lines and in combination with PI3K inhibition, they can cause synergistic cell death. However, long-term treatment of ERK inhibitor has found to create unexpected senescence and resistence mediated through the degradation of MYC and enhanced basal signaling of PI3K-AKT-mTOR, resepctively. (Cancer Cell,2016)
  • Combination treatment of trametinib and palbociclib on KRAS-mutant colorectal cancer patient derived xenograft models was fround well tolerated and efficacious; it has demonstrated the concept of co-targeting MEK and CDK4/6 can result in anti-tumor activity. This approach may improve the therapeutic outcome for those who are suffering from metastatic colorectal cancer in the future. (Clinical Cancer Research,2016)
  • Through the activation and postive feedback of Ras/Raf/MEK/ERK pathway, Hepatitis C virus (HCV) facilitates the hepatoma cell proliferation. Recently, bromodomain containing 7 (BRD7), a tumor suppressor triggered by Ras/Raf/MEK/ERK signaling, was found to attenuate hepatocellular carcinoma (HCC) development through the negative regulation of the same pathway. Thus, the balance between BRD7 and Ras/Raf/MEK/ERK activity is crucial for the regulation of HCV derived HCC . (Cancer Letters,2016)

Ras Signaling for Cancer Growth Suppression
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KRAS monoclonal antibody (M01), clone 3B10-2F2
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PDK1 monoclonal antibody, clone 4A11
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Immunohistochemsitry analysis of paraffin-embedded human breast cancer tissue using PDK1 monoclonal antibody, clone 4A11 with DAB staining.

MTOR monoclonal antibody (M01), clone 2C5
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Proximity Ligation Analysis of protein-protein interactions between AKT1 and MTOR. HeLa cells were stained with anti-AKT1 rabbit purified polyclonal at 1:1200 and anti-MTOR mouse monoclonal antibody at 1:50. Each red dot represents the detection of protein-protein interaction complex, and nuclei were counterstained with DAPI (blue).

References
Hayes, T.K., et.al. (2016). Cancer Cell. DOI:10.1016/j.ccell.2015.11.011
Ziemke, E.K., et.al. (2016). Clinical Cancer Research. DOI:10.1158/1078-0432.CCR-15-0829
Zhang, Q., et. al. (2016). Cancer Letters. DOI:10.1016/j.canlet.2015.11.027

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2016年3月1日 星期二

Neurodegenerative Disorder

Abnova Mar E-Newsletter
New Discoveries on Neurodegenerative Disorder
  • Strong evidence has emerged to implicate disturbed mitochondrial fusion and fission as central pathological components underpinning a number of neurodegenerative disorders. Imbalances in mitochondrial fusion and fission affects respiratory chain function, mitochondrial quality control (mitophagy), and programmed cell death. The same cellular processes are also implicated in more-common complex neurodegenerative disorders, such as Alzheimer disease and Parkinson disease. This indicates a common pathological thread and a close relationship among mitochondrial structure, function and localization. (Nature Reviews Neurology, 2015)
  • A mitochondrial fission arrest phenotype may cause elongated interconnected organelles, "mitochondria-on-a-string" (MOAS). Findings suggest that MOAS formation may occur at the final stages of fission process and was not associated with altered translocation of activated dynamin related protein 1 (Drp1) to mitochondria but with reduced GTPase activity. The findings on this research brings new attention to the major role of mitochondrial dynamics in regulating neuronal survival. (Scientific Reports, 2016)
  • Mutations in Parkin and PINK1 cause an inherited early-onset form of Parkinson's disease. The two proteins function together in a mitochondrial quality control pathway. Here, a binding switch between phospho-ubiquitin (pUb) and the ubiquitin-like domain (Ubl) of Parkin was found to play a key role in the release of auto-inhibited ubiquitin ligase activity of Parkin. (The EMBO J, 2015)
Neurodegenerative Disorders
Alzheimer's Disease Abs Huntington's Disease Abs Parkinson's Disease Abs

Mitochondria Implicated Neurodegenerative Disorder Pathways
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PARK2 monoclonal antibody (M01), clone 1H4
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BCL2L1 & BAX Protein Protein Interaction Antibody Pair
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References
Florence Burté, et.al. (2015). Nature Review Neurology. DOI: 10.1038/nrneurol.2014.228
Liang Zhang, et. al. (2016) Nature Scientific Reports, DOI: 10.1038/srep18725
Véronique Sauvé, et. al. (2015) The EMBO Journal. DOI: 10.15252/embj.201592237

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RNAi Regulations

New Discoveries through RNA interference
  • RNA interference has been developed as methods to evaluate IKK-NF-κB pathway in lung cancer through the influence of IKKα or IKKβ inhibition on NF-κB transcriptional activity and the effects of siRNA-mediated IKK inhibition on cancer proliferation. (Methods in Molecular Biology,2015)
  • High-throughput RNAi kinome screen targeting 720 kinases has identified PDK1 as a factor mediating resistance to CDK4/6 inhibition; thus, it can be a potential drug target in combination with CDK4/6 inhibitor LEE011 to treat ER+ breast cancer. (Cancer Research,2015)
  • Through RNA interference screen, genes, such as TACR1, were identified as factors involved in stress response of mammalian cells and further provides new approaches to reduce the mortality caused by renal ischemia. (Cell Death & Differentiation,2015)

RNAi Pathways
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16 Product Categories 15000+ Products
  Antibody Validated Chimera Pre-design Chimera
Angiogenesis 2 40
Apoptosis 14 470
Binding 65 2671
Cell Ad/ Junc/ Cytoskeleton 10 535
Cell Cycle 30 704
Cytokine N/A 56
Enzyme 52 793
Membrane 40 2778
Metabolism 13 333
Neurobiology 3 151
Plasma/ Serum 25 860
Signal Transduction 13 623
Stem Cell 10 239
Transcriptions 45 957
Ubiquitin 6 441
Others 45 3200

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NBR1 Validated Chimera RNAi
H00004077-R01V
Western blot analysis of NBR1 over-expressed 293 cell line, cotransfected with NBR1 Validated Chimera RNAi.
Lane 1. Non-transfected control
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TARDBP Validated Chimera RNAi
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References
Bassères, D.S., et.al. (2015). Methods in Molecular Biology. DOI:10.1007/978-1-4939-2422-6_27
Jansen, V.M., et.al. (2015). Cancer Research. DOI:10.1158/1538-7445.AM2015-2844
Zynda, E.R.., et. al. (2015). Cell Death & Differentiation. DOI:10.1038/cdd.2015.128

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2016年1月6日 星期三

Epigenetic Modifications

Abnova Jan E-Newsletter
New Discoveries on Epigenetics
  • H1 functions intrinsically to promote germline stem cells (GSC) self-renewal by antagonizing males absent on the first (MOF) function. The findings of H1 and H4K16 acetylation function might be applicable to stem cells in other species since H1 and H4K16 acetylation are highly conserved from fly to human. (Nature Communication, 2015)
  • Overexpression of a related H3K9me3 demethylase KDM4A improves human somatic cell nuclear transfer (SCNT). As H3K9me3 is a SCNT reprogramming barrier in human somatic cell genome, the overexpression of KDM4A facilitates transcriptional reprogramming and therefore, improves SCNT. This conserved mechanistic insight has potential applications for improving SCNT in a variety of contexts, including regenerative medicine. (Cell Stem Cell, 2015)
  • H4 tetra-acetylation is found to impair Nucleosome core particles (NCP) self-association by changing the interactions of the H4 tail with DNA, and is the first demonstration of crystallization quality NCPs reconstituted with genuine post-translational modifications (PTMs). (Nature Scientific Reports, 2015)

Epigenetic Regulation
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Epigenetic Gene Regulation:
Modification Methylation Acetylation
Mono-methylation Di-methylation Tri-methylation
DNA
Repression
--
--
--
Histone H3K4
Activation
Activation
Activation
--
H3K9
Activation
Repression
Repression
Activation
H3K27
Activation
Repression
Repression
--
H3K36
--
Repair
Activation
Activation
H3K79
Activation
Activation
Activation
Repression
--
H3R17
--
Activation
--
--
H4K5
--
--
--
Activation
H4K8
--
--
--
Activation
H4K12
--
--
--
Activation
H4K16
--
--
--
Activation
H4K20
Activation
Activation
Repression
--
H4K16
--
--
--
Activation

Eight Product Categories and 1000+ Products
  • 197 Monoclonal Antibodies
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  • 45 Antibody Pairs
  • 108 Recombinant Proteins
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  • 148 RNAi
  • 4 FISH Probes
  • 46 Cell Transient Overexpression Lysates

  • References
    Sun J, et.al. (2015). Nature Communication. DOI: 10.1038/ncomms9856
    Mohrin M, et. al. (2015) Cell Stem Cell. DOI: 10.1016/j.stem.2015.10.001
    Wakamori M, et. al. (2015) Nature Scientific Reports, DOI: 1038/srep17204
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    2015年12月2日 星期三

    TGFβ Signaling Pathway


    New Discoveries on TGFβ Signaling Pathway
    • ITGBL1, as an upstream effector of TGFβ signaling pathway, is a key contributor to osteomimetic breast cancer. (Cancer Research,2015)
    • Through the activation of TGFβ signaling pathway, HOXB7 promotes malignant tumor progression in cell-autonomous and non-cell-autonomous manners. (Cancer Research,2015)
    • Colon carcinogenesis is strongly associated with genetic mutations in TGFβ signaling pathway of inflamed and regenerating intestinal mucosa. (Cancer Research,2015)

    TGFβ / SMAD Signaling Pathway
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    References
    Li, X.-Q., et.al. (2015). Cancer Research. DOI:10.1158/0008-5472.CAN-15-0240
    Liu, S., et.al. (2015). Cancer Research. 10.1158/0008-5472.CAN-14-3100
    Oshima H., et. al. (2015). Cancer Research. DOI:10.1158/0008-5472.CAN-14-2036

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