title: Quantitation of mitochondrial alterations associated with apoptosis.
abstract: Mitochondria undergo two major changes during early apoptosis. On the one hand, the outer mitochondrial membrane becomes permeable to proteins, resulting in the release of soluble intermembrane proteins (SIMPs) from the mitochondrion. On the other hand, the inner mitochondrial membrane transmembrane potential (DeltaPsi(m)) is reduced. These changes occur in most, if not all, models of cell death and can be taken advantage of to detect apoptosis at an early stage. Here, we delineate methods for the detection of alterations in the DeltaPsi(m), based on the incubation of cells with cationic lipophilic fluorochromes, the uptake of which is driven by the DeltaPsi(m). Certain DeltaPsi(m)-sensitive dyes can be combined with other fluorochromes to detect simultaneously cellular viability, plasma membrane exposure of phosphatidylserine residues, or the mitochondrial production of reactive oxygen species (ROS). In addition, we describe an immunofluorescence method for the detection of two functionally important proteins translocating from mitochondria, namely, the caspase co-activator cytochrome c and the caspase-independent death effector apoptosis inducing factor (AIF).
authors.affiliation: Centre National de la Recherche Scientifique, UMR 1599, Institut Gustave Roussy, F-94805 Villejuif, France.
authors.forename: Maria
authors.initials: M
authors.lastname: Castedo
authors.forename: Karine
authors.initials: K
authors.lastname: Ferri
authors.forename: Thomas
authors.initials: T
authors.lastname: Roumier
authors.forename: Didier
authors.initials: D
authors.lastname: Métivier
authors.forename: Naoufal
authors.initials: N
authors.lastname: Zamzami
authors.forename: Guido
authors.initials: G
authors.lastname: Kroemer
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000502:physiology; D001692:Biological Transport; D006801:Humans; D008564:Membrane Potentials; D008856:Microscopy, Fluorescence; D008928:Mitochondria / Q000502:physiology*; D017382:Reactive Oxygen Species
chemical_list: D017382:Reactive Oxygen Species