Asynchronous PTP activation within a single cell

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Mitochondria are morphologically and functionally heterogeneous within cells Asynchronous PTP activation within a single cell. Location of mito‐DsRed1 (Ai) and calcein (Aii) fluorescence in the same cell. (Aiii) Difference image [i.e. (Aii) subtracted from (Ai)], indicating that mito‐DsRed1 and calcein co‐localized to the same organelles, except in a few small spherical vesicles [e.g. spot marked by arrowhead in panel (Aiii)]. (Bi) Another single calcein‐loaded HeLa cell. The circled mitochondria in (Bi) indicate the locations of organelles from which the fluorescence in (Bii) was recorded. PTP activation was initiated by addition of 100 μM tBuOOH [arrowhead in (Bii)]. The drop in fluorescence indicates PTP opening. The traces are expressed as normalized fluorescence calculated as (F − Fmin)/(Fmax − Fmin), except for those mitochondria that did not undergo PTP, which are expressed as F/Fmax (i.e. where there was no Fmin). The numbered mitochondria in (Bi) are those that did not show PTP activation during the experiment. The fluorescence of calcein in these mitochondria is depicted by the correspondingly numbered traces in (Bii). Scale bar, 5 μm. IF THIS IMAGE HAS BEEN PROVIDED BY OR IS OWNED BY A THIRD PARTY, AS INDICATED IN THE CAPTION LINE, THEN FURTHER PERMISSION MAY BE NEEDED BEFORE ANY FURTHER USE. PLEASE CONTACT WILEY'S PERMISSIONS DEPARTMENT ON PERMISSIONS@WILEY.COM OR USE THE RIGHTSLINK SERVICE BY CLICKING ON THE 'REQUEST PERMISSIONS' LINK ACCOMPANYING THIS ARTICLE. WILEY OR AUTHOR OWNED IMAGES MAY BE USED FOR NON-COMMERCIAL PURPOSES, SUBJECT TO PROPER CITATION OF THE ARTICLE, AUTHOR, AND PUBLISHER. EMBO J, Volume: 21, Issue: 7, Pages: 1616-1627, First published: 01 April 2002, DOI: (10.1093/emboj/21.7.1616)