For LC3 (rabbit; 2775; Cell Signaling Technology), P62 (rabbit; PM045; MBL), and PEX14 (rabbit; 10594–1-AP; Protein Tech) immunofluorescence, 10-µm cryosections of formalin-perfused, OCT-embedded heart was immunostained with the relevant antibodies and an Alexa Fluor 546–labeled donkey anti-rabbit (Life Technologies) secondary. HSP60 (sc-1052; Santa Cruz Biotechnology, Inc.) was visualized with Alexa Fluor 488–labeled donkey anti-goat.
Images were acquired using Zen 2009 software (Carl Zeiss) on a confocal microscope (LSM710; Carl Zeiss) at RT. A Plan-Apochromat 63×/1.4 oil objective was used. Photoshop was used only to change whole-image brightness/contrast and to crop.