Immunostaining in vivo and in vitro was performed as described previously (18 (link), 21 (link)). The samples were stained with primary and secondary antibodies as follows: anti-Rab9 mouse monoclonal antibody (1:100, Abcam, Cat #ab2810, RRID:AB_303323), anti-LAMP2 rabbit polyclonal antibody (1:100, Sigma, Cat #L0668, RRID:AB_477154), anti-LAMP2 mouse monoclonal antibody (1:100, Abcam, Cat #ab25631, RRID:AB_470709), anti-TOMM20 rabbit monoclonal antibody (1:100, Abcam, Cat #ab186734, RRID:AB_2716623), anti- LC3B rabbit polyclonal antibody (1:100, Abcam, Cat #ab51520, RRID:AB_881429), Alexa Fluor 488-conjugated goat anti-rabbit IgG (1:100, Abcam, Cat #ab150081, RRID:AB_2734747), and Alexa Fluor 594-conjugated goat anti-mouse IgG (1:100, Abcam, Cat #ab150120, RRID:AB_2631447). Fluorescence images were obtained using an LSM700 confocal laser scanning microscope (Zeiss, Cat #LSM700, RRID:SCR_017377). Pearson's correlation coefficient was calculated to quantify the colocalization correlation of the intensity distributions between the two channels, as previously described (22 (link)). We performed independent in-vitro experiments three times.
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