Development of a monoclonal antibody to immuno-cytochemical analysis of the cellular localization of the peripheral benzodiazepine receptor

✍ Scribed by D. Dussossoy; P. Carayon; D. Feraut; S. Belugou; T. Combes; X. Canat; H. Vidal; P. Casellas

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 824 KB
• Volume: 24
• Category: Article
• ISSN: 0196-4763
• DOI: 10.1002/(sici)1097-0320(19960501)24:1<39::aid-cyto5>3.0.co;2-d

✦ Synopsis

Based on the amino acid sequence deduced from the cloned human peripheral benzodiazepine receptor (PBR) gene, monoclonal antibody (Mab 8D7) was produced against the C-terminal fragment of the receptor. Immunoblot experiments, performed against purifiied PBR, indicated that the antipeptide antibody recognized, under denaturing conditions, the corresponding amino acid sequence of the PBR When mitochondrial membranes from PBR transfected yeast or from THPl and U937 cells were used on immunoblot analysis, a high level of immunoreactivity was observed at 18 kDa, the PBR molecular mass deduced from cDNA, establishing the spec-Mcity of the antibody for the receptor. Moreover, binding experiments realized with intact mitochon-dria demonstrated that the immunogenic sequence was accessible to the antibody indicating that the C-terminal fragment of the PBR faces the cytosol. Using this Mab we developed a technique which allowed precise quantiacation of PBR density per cell. Furthermore, cellular localization studies by flow cytometric analysis and confocal microscopy on cell lines displaying Merent levels of PBR showed that Mab 8D7 was entirely colocalized with an antimitochondria Mab. 8 19% wuey-~iss, I~C. Key terms: Peripheral benzodiazepine receptor