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GenomONE - CF EX HVJ
GenomONE - Neo EX HVJ

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GenomONE™
CF EX HVJ Envelope Cell Fusion Kit.

Background: 

GenomONE™ - CF EX is a cell fusion kit comprised of HVJ Envelope (HVJ-E) and special buffers. It can be used with both adhering cells and suspension cells. Fusion of the same or different cell types can be completed in only 30 minutes.

Principe:

What is HVJ Envelope (HVJ-E)?
HVJ Envelope is a purified product prepared through complete inactivation of Sendai virus (HVJ*). It is a vesicle in which only the cell membrane-fusing capability of the envelope protein of Sendai virus is retained.


It is known that the HN protein in the tunica externa of the Sendai virus recognizes the receptor (possessing sialic acid at the terminal of sugar chain) on the cell membrane and adsorbs it, leading to the induction of membrane fusion mediated by F protein (another component of the envelope). The genomic RNA of the Sendai virus contained in HVJ-E has been inactivated completely and has neither infective nor proliferative potential in humans or experimental animals. HVJ-E can be used safely at ordinary laboratories, without requiring any special operations or facilities
*HVJ:Hemagglutinating Virus of Japan

 

Principe for cell fusion triggered by HVJ-E:
 
How HVJ-E Works Membrane Binding:
       
If HVJ-E is added in amounts of more than several hundred HVJ-E per cell at low temperatures (0-8°C), HVJ-E is immediately adsorbed on the cell surface mediated by the receptor (acetyl type sialic acid recognized by HN protein) (Membrane Binding), and cells undergo agglutination cross-linked by HVJ-E particles (Membrane Distortion). At this stage, the hydrophobic domain at the N-terminal of cleaved F protein (F1) penetrates into the double lipid layer of the cell membrane, causing distortion of the membrane severe enough to allow an inflow of ions.
 
Membrane Distortion:
       
 
If this cell/HVJ-E complex is heated at 37°C, the distortion of the cell membrane is further expanded, accompanied by temporary alteration of the cell membrane lining structure.  This change is transient and the membrane soon returns to its normal structure.  However, if a strong hydrophobic connective force is applied at this stage, fusion between cell membranes takes place (Membrane Fusion).

Membrane Fusion:
      

Features and Advantages:

Cmparison with PEG method in hybridoma preparation

  hybridoma
growth supplement
hybridoma
positive rate
antibody-production
positive rate
GenomONE™ - CF EX 38/96 (40%) 9/96 (9%)
96/96 (100%) 96/96 (100%)
PEG1500 3/96 (3%) 1/96 (1%)
36/96 (38%) 9/96 (9%)

GenomONE - CF EX produces more antibody secreting hybridomas than PEG. (following cell fusion, cells were grown in media containing hybridoma growth supplement as indicated).

Normal BALB/c mouse splenocytes (1x10^8 cells) not sensitized with antigen were fused to X63-Ag8.653 myeloma cells (1x10^7 cells) using GenomONE(tm)-CF EX  or PEG1500. The fused cells obtained with each agent were inoculated onto five 96-well plates (Day 0). Beginning the following day, half of the culture medium (10%FBS/RPMI1640) was replaced with HAT medium at five points of time (Days 1, 2, 3, 5, and 8), and the growth of colonies in each well was assessed on Days 10 -11 to determine the hybridoma-positive rate
(an indicator of efficiency of fusion). On Day 12, mouse antibody level (IgG + IgA + IgM) in the supernatant was measured by ELISA, to calculate the antibody production-positive rate. The effect of adding a commercially available hybridoma supplement to the medium after fusion was also assessed (supplement was also added to the HAT medium).

Footnote:
The results shown above are an example, and experimental conditions need to be optimized depending on the type of antigen, myeloma cell, supplement etc. used.

Application:

  1. Hybridoma preparation
    Cell fusion involving PEG and electrofusion Preparation of monoclonal antibodies Fusion of antigen-sensitized B cells and myeloma cells
    Example (Published research article)
    Generation and Characterization of Novel Monoclonal Antibodies Against Murine and Human TARSH Proteins.
    N. Uekawa et al . Hybridoma (Larchmt), 26, 381-385(2007).PMID:18158782
  2. Fusion of suspension cells
    Example (Published research article)
    Enhanced Tumor-Specific Long-Term Immunity of Hemaggluttinating Virus of Japan-Mediated Dendritic Cell-Tumor Fused Cell Vaccination by Coadministration with CpG Oligodeoxynucleotides
    K. Hiraoka et al. J. Immunol.,173, 4297-4307(2004).PMID:15383558
  3. Fusion of adherent cell and suspension cell

  4. Application in premature chromosome condensation (PCC)
    Detection of chromosomal damage and repair by fusion of different types of cells in different cell phases
  5. Research on regenerative medicine and cytotherapy
    Fusion of somatic cells and stem cells, etc.
  6. Research on embryonic development/differentiation
    Nuclear transfer (nuclear replacement)
  7. GenomONE™ - NEO EX HVJ Envelope Vector Kit
    Unique, efficient transfection of siRNA, DNA, oligonucleotides, proteins.
    Low toxicity with primary cell lines.

Kit component:

GenomONE™ - CF EX Kit Contents
(for 10 hybridoma fusion experiments)

Freeze-dried HVJ-E

0.26 ml
equivalent

HVJ-E suspension buffer

0.5 ml

20x Cell Fusion Buffer

10 ml

_____________________________________________________________________________________________________________________

GenomONE-CF EX HVJ-E 1 Vials Cell fusion Reagents

 ISK-CF-001-EX 1 SET  €262

 

 

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