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2016年8月3日 星期三

Lysosomal Regulations

Abnova August E-Newsletter
New Discoveries on Lysosomal Regulations Related Research
  • A mechanism in phagocytosis involving TFEB-dependent Fcγ-receptor activation was found to enhance lysosomal degradation. The results of this study suggest that phagosomes and lysosomes are capable of bi-directional signaling. (Cell Current Biology, 2016)
  • Motility is crucial for lysosomes to traffic towards cargo-carrying vesicles for the degradation of biomacromolecules. Here, the release of Ca2+ through lysosomal Ca2+ channel TRPML1 was found to regulate lysosome motility, positioning and tubulation. (Nature Cell Biology, 2016)
  • Results of this study unveiled a lysosomal response to the arrival of autophagosomal cargo in which OCRL plays a key role. Depleting or inhibiting OCRL leads to an accumulation of lysosomal PtdIns(4,5)P2, an inhibitor of the calcium channel mucolipin-1 that controls autophagosome–lysosome fusion. (Nature Cell Biology, 2016)

Lysosomal Membrane Proteins and Diseases
  Gene Name   Gene ID   Gene Mutation Related Diseases
  CLCN7   1186   Malignant infantile osteopetrosis
  CLN3   1201   Juvenile neuronal ceroid lipofuscinosis
  CTNS   1497   Cystinosis
  HGSNAT   138050   Mucopolysaccharidosis type IIIC
  LAMP2   3920   Danon disease
  LMBRD1   55788   Cobalamin F-type disease
  MCOLN1   57192   Mucolipidosis type IV
  MFSD8   256471   Late infantile neuronal ceroid lipofuscinosis
  NPC1   4864   Nemann-Pick type C
  OSTM1   28962   Malignant infantile osteopetrosis
  SCARB2   950   Action myoclonus-renal failure syndrome
  SLC17A5   26503   Salla disease

Lysosomal Regulations
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CD63 monoclonal antibody, clone MEM-259 (PerCP)
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Immunofluorescence staining of human primary fibroblasts with CD63 monoclonal antibody, clone MEM-259 (Cat # MAB6493, green) after co-incubation of living cells with human Transferrin-Dyomics 547 (red) . Cell nuclei stained with DAPI (blue).

ATP6V1A monoclonal antibody (M02), clone 4F5
H00000523-M02


Immunohistochemistry staining of formalin-fixed paraffin-embedded human placenta with ATP6V1A monoclonal antibody (M02), clone 4F5 (Cat # H00000523-M02) at 3 ug/mL.

LAMP2/CENXp FISH Probe
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Fluorescent in situ hybridization of formalin-fixed paraffin-embedded human colon cancer (FFPE) with LAMP2/CENXp FISH Probe. (Cat # FG0059).

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References
Matthew A. Gray, et. al. (2016). Cell Current Biology. DOI: 10.1016/j.cub.2016.05.070
Xinran Li, et. al. (2016) Nature Cell Biology, DOI: 10.1038/ncb3324
Maria Giovanna De Leo, et. al. (2016) Nature Cell Biology. DOI: 10.1038/ncb3386

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2016年7月7日 星期四

Exosome Biomarkers

New Discoveries on Exosome Related Research
  • Dendritic cell-derived exosomes (Dex), with surface expression of MHC-peptide complexes, are able to interact with immune cells. Having conducted in advanced malignancies, these nanometer-sized Dexs are able to mediate T and NK cell-based immune response in patients as a feasible and safe immunotherapy for cancer. (The Journal of Clinical Investigation,2016)
  • Tumor derived exosomes (TDEs) carry epithelial mesenchymal transition inducers to invade organ-specific cells and induce organotropic metastasis through stromal remodeling and pre-metastatic niche formation. Pharmacological agents targeting TDE biogenesis, secretion and function, such as heparanase/ syndecan-1 axis, may exert anti-metastatic activity. (Trends in Pharmacological Sciences,2016)
  • Exosome-transmitted IncARSR, by acting as a competing endogenous RNA, can induce sunitinib resistance in renal cancer. IncARSR competitively binds miR-34/miR-449 to facilitate AXL and c-MET expression in renal cell carcinoma and promote sunitinib resistance. Thus, IncARSR may be a potential therapeutic target to restore drug sensitivity. (Cancer Cell,2016)

Tumor-derived Exosomes in Tumor Microenvironment
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BIRC5 monoclonal antibody (M01), clone 5B10
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Immunofluorescence staining of HeLa cells with BIRC5 monoclonal antibody (M01), clone 5B10 at the concentration of 10 ug/mL.

HSP90AB1 monoclonal antibody, clone 5G4
MAB10686
Immunofluorescence staining of HeLa cells using HSP90AB1 monoclonal antibody, clone 5G4 (green), DRAQ5 fluorescent DNA dye (blue) and Alexa Fluor-555 phalloidin (red).

TSG101 monoclonal antibody (M01), clone 5B7
H00007251-M01
Immunohistochemsitry analysis of formalin-fixed paraffin-embedded human kidney tissue using TSG101 monoclonal antibody, clone 5B7 at the concentration of 3 ug/mL.

References
Pitt, JM., et.al. (2016). The Journal of Clinical Investigation. DOI:10.1172/JCI81137
Syn, N., et.al. (2016). Trends in Pharmacological Sciences. DOI:10.1016/j.tips.2016.04.006
Qu, L., et. al. (2016). Cancer Cell. DOI:10.1016/j.ccell.2016.03.004

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2016年6月8日 星期三

Eukaryotic Transcription Cycle

New Discoveries on Eukaryotic Transcription Cycle
  • Enhancers were found to be at the heart of deciphering contemporary regulatory biology. The discovery of enhancer RNA (eRNA)-producing transcription units as most functional enhancers has profound implications in future understanding of gene regulation, development and disease. (Nature Reviews Genetics, 2016)
  • A pioneer factor FoxA was found to displace linker histone H1, thereby keeping enhancer nucleosomes accessible in chromatin and allowing other liver-specific transcription factors to bind and stimulate transcription. This discovery provided new evidence for nucleosomal configuration of open chromatin and the basis for its regulation mechanism. (Molecular Cell, 2016)
  • A pooling-based approach was introduced to mapping quantitative trait loci (QTLs) for molecular-level traits. These QTLs not only affect local chromatin and transcription but also influence long-range chromosomal contacts, demonstrating a role for natural genetic variation in chromosomal architecture. The findings of this research suggested that transcription factor (TF) binding variation may play a crucial role in human phenotypic variation. (Cell, 2016)
RNA polymerases
 Name  Subcellular Location  Transcription Product(s)
 RNA Polymerase I  Nucleolus  rRNAs
 RNA Polymerase II  Nucleus  mRNAs, snRNAs, siRNAs, miRNAs
 RNA Polymerase III  Nucleus  tRNAs, 5s rRNAs, snRNA U6, SRP RNA, other short RNAs




 Abbreviation   Full Name
  CPSF   Cleavage and polyadenylation specificity factor
  CSTF   Cleavage stimulation factor
  DSIF   DRB sensitivity-inducing factor complex
  NELF   Negative elongation factor
  PAFc   Polymerase-associated factor complex
  PAB   Poly(A) binding protein
  PAP   Poly(A) polymerase
  SECs   Super elongation complexes
  TF   Transcription factor

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POLR2F monoclonal antibody (M02), clone 2G2
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Immunofluorescence staining of HeLa cells with POLR2F monoclonal antibody (M02), clone 2G2 (Cat # H00005435-M02) at 10 ug/mL.

EAF1 purified MaxPab mouse polyclonal antibody (B01P)
H00085403-B01P
Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) staining of human stomach (FFPE) with EAF1 purified MaxPab mouse polyclonal antibody (B01P) (Cat # H00085403-B01P) at 3 ug/mL.

MLL/CEN11p FISH Probe
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Fluorescent in situ hybridization of human lung adenosquamous cell carcinoma (FFPE) with MLL/CEN11p FISH Probe (Cat # FG0016).

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References
Wenbo Li, et.al. (2016). Nature Review Genetics. DOI: 10.1038/nrg.2016.4
Makiko Iwafuchi-Doi, et. al. (2016) Molecular Cell. DOI: 10.1016/j.molcel.2016.03.001
Ashley K. Tehranchi, et. al. (2016) Cell. DOI: 10.1016/j.cell.2016.03.041

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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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Immunofluorescence staining of HeLa cells with KRAS monoclonal antibody (M01), clone 3B10-2F2 at 10 ug/mL.

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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IGH/BCL2 DY Translocation FISH Probe
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PARK2 monoclonal antibody (M01), clone 1H4
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Immunofluorescence of HeLa Cells with PARK2 monoclonal antibody (Cat # H00005071-M01) at 10 ug/mL.

BCL2L1 & BAX Protein Protein Interaction Antibody Pair
DI0068

Proximity Ligation Assay of HeLa cells with Anti-BCL2L1 rabbit purified polyclonal antibody (1:1200) and anti-BAX mouse monoclonal antibody (1:50).
DAPI (blue)


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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