A sandwich ELISA for the conformation-specific quantification of the activated form of human Bax

作者：Teijido Oscar; Ganesan Yogesh Tengarai; Llanos Raul; Peton Ashley; Urtecho Jean Baptiste; Soprani Adauri; Villamayor Aimee; Antonsson Bruno; Manon Stephen; Dejean Laurent

来源：Analytical Biochemistry, 2016, 497: 90-94.

DOI：10.1016/j.ab.2015.12.016

• ELISA
• Bax Conformation specificity
• Apoptosis
• Mitochondria

Bcl-2 family proteins are critical regulators of mitochondrial outer membrane permeabilization (MOMP), which represents the point of no return of apoptotic cell death. The exposure of the Bax N-terminus at the mitochondria reflects Bax activation; and this activated configuration of the Bax protein is associated with MOMP. N-terminal exposure can be detected using specific monoclonal and/or polyclonal antibodies, and the onset of activated Bax has extensively been used as an early marker of apoptosis. The protocols of immunoprecipitation and/or immunocytochemistry commonly used to detect activated Bax are long and tedious, and allow semiquantification of the antigen at best. The sandwich ELISA protocol we developed has a 5 ng/mL detection limit and is highly specific for the activated conformation of Bax. This ELISA allows a rapid quantification of activated human Bax in whole cells and isolated mitochondria protein extracts. These properties grant this assay the potential to further clarify the prognostic and diagnostic value of activated Bax in disorders associated with deregulated apoptotic pathways such as degenerative diseases or cancer.

• 出版日期2016-3-15
• 单位NIH