Glucagon receptor, GeneTex, GTX71693

We here review a publication from Novo Nordisk and University of Copenhagen providing a head-to-head comparison of all commercially available antibodies against the glucagon receptor (GCGR) (Bomholt et al., Communications Biology, 2022).
The authors systematically evaluated 12 commercial antibodies (Table S1) in HEK293 cells transfected with mouse or human cMyc-tagged GCGR cDNAs and studied liver sections from Gcgr+/+ and Gcgr-/- mice. Autoradiography, RNA-sequencing, and single cell RNA-sequencing were used as antibody independent approaches to support the findings obtained with IHC.
Transfected cells were permeabilized with methanol.
All GCGR antibodies, including this one from GeneTex, gave overlapping staining with the cMyc antibody, demonstrating the ability to specifically recognize recombinant GCGR in transfected cells.
No staining was seen in control transfected cells or cells without primary antibodies (Fig. 1).
The antibodies were also checked for their ability to detect membrane bound GCGR by staining unpermeabilized HEK293 cells transfected with human GCGR and fixed in 4% PFA.
The GeneTex antibody GTX71693 (Antibody 6 in the paper) also showed positive staining of membrane bound GCGR (Fig. S1)
The antibodies were subsequently evaluated using formalin-fixed and paraffin-embedded liver sections from female Gcgr+/+ and Gcgr-/- mice. However, the GeneTex antibody showed unspecific staining of KO tissue (Fig. 2a)
The antibody showed some signal in IHC on paraffin embedded human liver tissue from patients with NASH (Fig. 2S).
In conclusion, GeneTex GTX71693 receives a 2 star rating in immunostaining based on its ability to specifically recognize GCGR in transfected cells but with the caveat that it gave unspecific staining of KO tissue.
We highly encourage the scientific community to share their experiences.