VSIG IgG Superfamily Members: Potential New Immunotherapeutic Drug Targets

The B7 family and other T cell co-stimulatory/co-inhibitory molecules are widely recognized as therapeutic targets for cancer immunotherapy. V-Set and Immunoglobulin domain containing (VSIG) proteins are members of the immunoglobulin protein superfamily and are increasingly recognized as potential immuno-oncology targets. In fact, R&D Systems scientists have identified VSIG3 as the ligand of VISTA-PD-1H.1 Other unpublished results from our in-house research provide further evidence that the VSIG family plays an important role in T cell regulation.

R&D Systems exclusively offers bioactive VSIG proteins in both unlabeled and biotinylated formats for identifying binding partners and the development of novel therapies for immune checkpoint blockade.

ProteinSpeciesSourceTagCatalog #Activity
VSIG1HumanNS0Fc9708-VSSuppresses IL-17 secretion
MouseNS0Fc9645-VS
VSIG2HumanNS0Fc9815-VSSuppresses IL-17 secretion
MouseNS0Fc9598-VS
VSIG3HumanNS0Fc9229-VSBinds VISTA/PD-1H (Catalog # 7126-B7)
HumanCHOFc, Avi-tagAVI9229
HumanNS0Fc, BiotinBT9229
HumanCHOFc, C-term10075-VSSuppresses IL-17 secretion
HumanCHOFc, N-term10074-VS
HumanNS0His10806-VS
MouseNS0Fc9367-VS
VSIG4HumanCHOHis9816-VSSuppresses IFN-gamma secretion
HumanCHOFc9817-VS
MouseNS0His9747-VS
MouseNS0Fc4674-VSSuppresses T cell proliferation
Cynomolgus MonkeyHEK293Fc10155-VSSuppresses IFN-gamma secretion
Cynomolgus MonkeyHEK293His10807-VS
VSIG4 Long isoformHumanNS0Fc4646-VSBinds complement component iC3b
HumanHEK293Fc, Avi-tagAVI4646
HumanNS0His9678-VSSuppresses IFN-gamma secretion
VSIG8HumanCHOFc9200-VSInhibits CD3+ T cell proliferation and IL-2 secretion
Cynomolgus MonkeyCHOFc11172-VSSuppresses IL-2 secretion
MouseNS0Fc9204-VS
TIGIT/
VSIG9/
VSTM3
HumanHEK293Fc9464-TGBinds CD155/PVR (Catalog # 2530-CD)
HumanCHOFc7898-TGBBinds CD155/PVR (Catalog # 2530-CD)
HumanCHOHis, Avi-tagAVI11124Binds CD155/PVR (Catalog # 2530-CD)
HumanCHOHis9525-TGBinds CD155/PVR Fc (Catalog # 9174-CD)
MouseNS0Fc7267-TGBinds CD155/PVR (Catalog # 6909-CD)
Cynomolgus MonkeyHEK293Fc9380-TGBinds CD155/PVR (Catalog # 2530-CD)
VSIG10MouseNS0Fc9604-VSSuppresses IL-17 secretion
VSIG10LHumanHEK293His9599-VSSuppresses IFN-gamma Secretion
HumanHEK293Fc9600-VS

VSIG Activity Data

Human VSIG3 binding in a functional binding ELISA.

Recombinant Human VSIG3 binds to Recombinant Human VISTA/PD-1H in a functional binding ELISA. The concentration of VSIG3 that produced 50% optimal binding was 0.25 mg/mL (3.4 nM).

Human VSIG3 inhibition of anti-CD3 antibody induced IL-17 secretion in human PBMCs.

Recombinant Human VSIG3 (Catalog # 9229-VS) inhibits anti-CD3 antibody induced IL-17 secretion in human PBMCs. The ED50 for this effect is 1-6 ug/mL.

Human VSIG-10L inhibition of IFN-gamma secretion by PBMCs.

Recombinant Human VSIG-10L (Catalog # 9600-VS) inhibits IFN-gamma secretion by PBMCs in the presence of anti-CD3 antibody. The ED50 for this effect is 1-6 µg/mL.

Human VSIG8 inhibits anti-CD3 induced human CD3+ T cell proliferation.

Recombinant Human VSIG8 inhibits anti-CD3 induced human CD3+ T cell proliferation. For more information on VSIG8's role as a coinhibitory ligand, see our poster.

SDS-PAGE of recombinant cynomolgus monkey VSIG4.

Recombinant Cynomolgus Monkey VSIG4 (Catalog # 10155-VS) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions showing bands at 67-76 kDa and 130-150 kDa, respectively.