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. 2020 Apr 7;219(6):e201907067. doi: 10.1083/jcb.201907067

Figure 6.

Figure 6.

HLH-30/TFEB drives longevity from combined inhibition of mitochondrial translation and dynamics. (A and B) Lifespan analysis performed in eat-3(tm1107) (A) and drp-1(tm1108) (B) subjected to RNAi against mrps-5 and hlh-30, individually or in combination. hlh-30 RNAi abolishes mrps-5 RNAi-mediated lifespan increase in both the eat-3(tm1107) and the drp-1(tm1108) mutant worms. See Table S1 for lifespan statistics. (C) Representative micrographs of worms expressing HLH-30::GFP grown on ev, mrps-5 RNAi, eat-3 RNAi, or mrps-5;eat-3 double RNAi bacteria (as indicated). Images were taken at day 2 of adulthood. χ2 tests were performed to assess the significance of differences in the levels of HLH-30::GFP nuclear enrichment among RNAi-treated N2 worms (P = 0.0001, P = 0.0005, and P = 0 when comparing mrps-5 RNAi + ev, eat-3 RNAi + ev, and mrps-5 + eat-3 RNAi to ev-treated controls, respectively). The upper panels show fluorescent images of HLH-30::GFP nuclear localization, while the lower panels display overlay of HLH-30::GFP fluorescent images with bright field images of worms. Scale bar in ev-treated condition is 100 µm and applies to all the images in C. White arrowheads indicate intestinal nuclei. (D) Quantification of HLH-30 nuclear localization in C: n = 16–29 different animals per RNAi treatment, pooled from two independent experiments. (E) HLH-30::GFP nuclear localization in intestinal cells of wild-type, drp-1(tm1108) mutant, and drp-1;fzo-1 double mutant worms at day 2 of adulthood. Scale bar in ev-treated N2 is 100 µm and applies to all the images in E. White arrowheads indicate intestinal nuclei. (F) Quantification of HLH-30 nuclear enrichment in E: n = 21–32 different animals per RNAi treatment, pooled from two independent experiments. χ2 tests were performed to assess the significance of differences in the levels of HLH-30::GFP nuclear enrichment in N2, drp-1(tm1108) mutant, and drp-1;fzo-1 mutant upon mrps-5 RNAi (P = 0, P = 0.0314, and P = 0.5533 when comparing mrps-5 RNAi to ev-treated controls in N2, drp-1(tm1108), and drp-1;fzo-1, respectively).