Probing Mitochondrial Permeability Transition Pore Activity in Nucleated Cells and Platelets by High-Throughput Screening Assays Suggests Involvement of Protein Phosphatase 2B in Mitochondrial Dynamics

Autor: Mao Xiang Chen, Matilde Caivano, Sumitra Ramachandran, Emma Ward, Sandy Toh, Mahmood Ahmed, A. Richard Rutter, Kirsten L. Searle, Yannick M. L. Lacroix
Rok vydání: 2018
Předmět:
Zdroj: ASSAY and Drug Development Technologies. 16:445-455
ISSN: 1557-8127
1540-658X
DOI: 10.1089/adt.2018.872
Popis: Mitochondrial permeability transition pore (mPTP) formation is well documented in isolated mitochondria. However, convincing detection of mPTP in whole cells remains elusive. In this study, we describe a high-throughput assay for Ca2+-activated mPTP opening in platelets using HyperCyt flow cytometry. In addition, we demonstrate that in several nucleated cells, using multiple approaches, the detection of cyclophilin D-dependent mPTP opening is highly challenging. Results with the mitochondrial-targeted Ca2+-sensing green fluorescent protein (mito-Case12) suggest the involvement of protein phosphatase 2B (PP2B; calcineurin) in regulating mitochondrial dynamics. Our results highlight the danger of relying on cyclosporine A alone as a pharmacological tool, and the need for comprehensive studies of mPTP in the cell.
Databáze: OpenAIRE