Fc Gamma Receptor 2B (FcGR2B, FcγRIIB), also known as CD32B, is a "low affinity" receptor for Immunoglobulin G (IgG). FcGR2B is involved in the phagocytosis of immune complexes and in the regulation of antibody production by B-cells. It is the predominant Fc receptor present on B cells. Crosslinking of antibodies by FcGR-expression cells can promote receptor clustering and increase downstream signaling. FcGR2B crosslinking is important for anti-TNFR receptor antibodies.
The FcGRIIB Lentivirus are replication incompetent, HIV-based, VSV-G pseudotyped lentiviral particles that are ready to be transduced into almost all types mammalian cells, including primary and non-dividing cells. The particles contain a FcGRIIB gene (NM_004001.4) driven by a CMV promoter (Figure 1).
Figure 1. Schematic of the lenti-vector used to generate the FcGRIIB lentivirus
Two vials (500 μl x 2) of lentivirus at a titer ≥5 x 106 TU/ml. The titer will vary with each lot; the exact value is provided with each shipment.
Formulation
The lentiviruses were produced from HEK293T cells in the medium containing 90% DMEM + 10% FBS.
Storage/Stability
Lentiviruses are shipped with dry ice. For long-term storage, it is recommended to store the lentiviruses at -80°C for up to 12 months from date of receipt. Avoid repeated freeze/thaw cycles. Titers can drop significantly with each freeze/thaw cycle.
Shipping Temperature
-80°C
Warnings
Biosafety
None of the HIV genes (gag, pol, rev) will be expressed in the transduced cells, as they are expressed from packaging plasmids lacking the packing signal. Although the pseudotyped lentiviruses are replication-incompetent, they require the use of a Biosafety Level 2 facility. BPS recommends following all local federal, state, and institutional regulations and using all appropriate safety precautions.