EMBO/SourceData huggingface dataset:
Figure 1(E-F) Serum levels of T (E) and LH (F) in WT males, ARLmon/Y and AR-/Y mice at the age of 13 weeks.
Figure 2(D) RT-qPCR analyses of Rhox5 and Insl3 of testes from 13-week old WT males, ARLmon/Y and AR-/Y. Expression levels are normalized to WT.
Figure 3(A) Expression levels of genes involved in steroidogenesis normalized to WT. The bar graphs show means ± SEM (data derived from RNA-seq analysis of testes, biological replicates, n = 5, one-way ANOVA with Tukey's multiple comparisons test, *P < 0.05, **P < 0.01, ***P < 0.001, ns = not significant).(B) Serum levels of A-dione in WT males, ARLmon/Y and AR-/Y mice at the age of 13 weeks.(D) Reporter gene assays in Hela cells co-transfected with the mouse Insl3 promotor together with the WT or mutant mouse AR.
Figure 4mRNA expression levels extracted from RNA-seq data for Fkbp5 (D) in kidneys used for RNA-seq. Expression levels are normalized to WT ORX.mRNA expression levels extracted from RNA-seq data for , Odc1 (E) and Kap (F) in kidneys used for RNA-seq. Expression levels are normalized to WT ORX.
Figure 5(B) Specific ligand binding assay in COS cells with overload of cold ligand and increasing concentrations of radioactive labeled DHT. Values are normalized to protein expression.(C) Western blot on cytoplasmic, nuclear and whole cell extracts derived from Hela cells transfected with human WT or W752R AR followed by stimulation with increasing concentrations of DHT. Both panels represent the same blot. The blot was cut in two parts and antibodies against HSP90 and Lamin A/C were used to confirm cellular fractionation of cytoplasmic and nuclear proteins. For AR visualization (upper panel), longer exposure time was used. # = residual AR expression (lower panel).
Figure 6(B) AR occupancy (blue) and levels of the histone marks H3K27ac (green) and H3K27me3 (red) at ARBS within the regulatory regions of Fkbp5, Kap (both androgen-regulated in kidney) and Tox3 (androgen-regulated in prostate but not in kidney and hence used as a negative control) were assessed by ChIP-qPCR in kidneys from 13-week-old ARLmon/Y mice and WT males.(C) Representative pictures of immunofluorescence AR staining (green) in kidneys of castrated WT males and ARLmon/Y mice supplemented with vehicle or T. Nuclei are shown in blue.
Figure 7(A) Double hybrid assay in COS cells transfected with WT LBD, W752R LBD or empty vector (negative control) in the presence of the LxxLL fragment of SRC1.(B) Confocal fluorescence microscopy images of AR-WT-BirA* and AR W752R-BirA*expressing HEK293 cells treated in the presence of 50 µM biotin with 100 nM DHT or vehicle (ethanol) and with or without 0.03 µg/ml TET as indicated. AR-BirA*s were detected with anti-AR (red) and biotinylated proteins with fluorescently labeled streptavidin (green). Nuclei were visualized using DAPI.
Figure 1(A) The degradation of 3HA-Pgc1 was analyzed in cells with the indicated genotype upon inhibition of protein synthesis with cycloheximide (chx). A plasmid-borne 3HA-Pgc1 expressed from the endogenous promoter was used. 3HA-Pgc1 was detected with anti-HA antibodies. Kar2 was used as a loading control and detected with anti-Kar2 antibodies. The graph on the right shows the average of four independent experiments; error bars represent the standard deviation.(B) The ubiquitination of 3HA-Pgc1 was analyzed in cells with the indicated genotype and expressing myc-tagged ubiquitin. 3HA-Pgc1 was immunoprecipitated using anti-HA and polyubiquitin-conjugated 3HA-Pgc1 was detected using anti-myc antibody. Input fraction corresponds to 2% of the total amount used for IP.(C) The degradation of 3HA-Pgc1 was analyzed as in (A) in cells bearing the CDC48 temperature-sensitive allele cdc48-6. Cells were grown 2,5 hours at 37C prior addition of cycloheximide. Inactivation of Cdc48 mutant protein was confirmed by stabilization of the ERAD substrate Erg1 in the same cells.(D) Membrane association of ubiquitinated 3HA-Pgc1 was analyzed by density gradient centrifugation followed by immunoprecipitation. Cells of the indicated genotype and expressing myc-tagged ubiquitin were grown as in (C). Lysates were subjected to centrifugation on an optiprep density gradient. Collected fractions were analyzed by western blotting before and after immunoprecipitation with anti-HA antibodies. Dpm1 and Pgk1 were used as markers for membrane bound and soluble fractions respectively. Input fraction corresponds to 10% of the total amount used for IP. "Top", "mid", "bottom" indicate the fractions from the gradient. Asterisk marks a faster migrating unspecific band in the input bottom fraction.
Figure 2(A) Localization of chromosomally expressed GFP-Pgc1 from the constitutive ADH1 promoter in wt and doa10Δ cells. Arrowheads indicate GFP-Pgc1 labeling at the ER, which is stained by Sec63-Cherry. LDs were visualized upon staining with the neutral lipid dye MDH. On the bottom, box plot with quantitation of GFP-Pgc1 fluorescence intensity at the nuclear envelope in wt and doa10Δ. GFP-Pgc1 measurements were performed as described in the Materials and Methods section. Scale bar: 5 µm.(C) Crude membranes from wt and doa10Δ cells expressing 3HA-Pgc1 were subjected to the indicated treatments and subsequently fractionated into membrane pellet (P) and supernatant (S).(D) Crude membranes from wt and doa10Δ cells expressing 3HA-GFP-Pgc1275-321 were analyzed as in (C).
Figure 3(A) Localization of GFP-Pgc1 in are1Δ are2Δ lro1Δ dga1Δ cells in presence (no LDs) or absence of DOA10 (no LDs doa10Δ). The ER was visualized by expression of Sec63-Cherry. Scale bar: 5 µm.(B) GFP-Pgc1 was expressed under the ADH1 promoter; LD formation was stimulated by galactose-induced expression of DGA1 in are1Δare2Δlro1Δ. Fluorescence microscopy was used to follow GFP-Pgc1 localization over time. LDs were visualized upon staining with the neutral lipid dye MDH. Scale bar: 5 µm.(C) Photo-conversion of tdEOS-Pgc1 expressed under the ADH1 promoter; LD formation was stimulated by galactose-induced expression of DGA1 in are1Δare2Δlro1Δdoa10Δ cells. The red square marks the photo-converted region. The time (in minutes) after photoconversion is indicated. Arrowheads point LDs containing photoconverted tdEOS-Pgc1. Scale bar 5µm.(D) FRAP experiment of GFP-Pgc1 in wt and doa10Δcells. Representative examples are shown. The bleached areas are marked by red squares and include a LD adjacent to ER. The time (in seconds) after photobleaching is indicated. Each graph shows average fluorescence intensities for 10 cells normalized to pre-bleached plotted over time. Error bars indicate standard deviation.
Figure 4(A) The degradation of 3HA-Pgc1 was analyzed in cells with the indicated genotype as in Fig. 1A. The graph shows the average of three independent experiments; error bars represent the standard deviation.(B) The degradation of the Doa10 substrates 3HA-Pgc1 and 3HA-Vma12-Ndc10C' was analyzed in cells of the indicated genotypes treated with oleic acid. 3HA-Pgc1 and 3HA-Vma12-Ndc10C' were detected with anti-HA antibodies. Dpm1 was used as a loading control and detected with anti-Dpm1 antibodies. The graph shows the average of three independent experiments; error bars represent the standard deviation.
Figure 5(A) Localization of GFP-tagged Pgc1 derivatives in which the hydrophobic hairpin (aa275-321) was replaced by membrane anchor of Scs2 (Pgc1Scs2MA) or Bos1 (Pgc1Bos1MA). ER and LDs were visualized by expression of Sec63-Cherry and MDH staining, respectively. Scale bar: 5 µm.(B) The degradation of 3HA-Pgc1 or the indicated chimeras in wt and doa10Δ cells was analyzed as in Fig. 1A. The blot is representative of at least three independent experiments.(C) The degradation of 3HA-GFP-Pgc1275-321 in wt and doa10Δ cells was analyzed as in Fig. 1A. The graph shows the average of four independent experiments; error bars represent the standard deviation.(D) Localization of 3HA-GFP-Pgc1275-321 in doa10Δ cells. The ER was visualized by expression of Sec63-Cherry. Scale bar: 5 µm.
Figure 6(A) The degradation of 3HA-Pgc1-GPAT160-216, containing GPAT4 hydrophobic hairpin (aa160-216) replacing the one of Pgc1 was analyzed in cells with the indicated genotype as in Fig. 1A. The graph shows the average of three independent experiments; error bars represent the standard deviation.(B) Localization of GFP-Pgc1-GPAT4160-216 in cells with the indicated genotype. Arrowheads indicate GFP-Pgc1-GPAT4160-216 labeling at the ER, marked with Sec63-Cherry. LDs were visualized upon staining with MDH. Scale bar: 5 µm.(C) The degradation of 3HA-Pgc1-GPAT160-216 in cells with the indicated genotype was analyzed as in Fig. 1A. The graph shows the average of three independent experiments; error bars represent the standard deviation.(D) Localization of GFP-Pgc1-GPAT160-216 in are1Δ are2Δ lro1Δ dga1Δ doa10Δ mutant (no LDs doa10Δ). The ER was visualized by expression of Sec63-Cherry. Scale bar: 5 µm.
Figure 1B Representative microphotographs and quantitative analyses of ACE2 immunohistochemical staining in lungs from young (2 months) and old (22 months) mice (n = 3 mice per group). Scale bar 200 µm.C Representative microphotographs and quantitative analyses of ACE2 immunohistochemical staining in lung parenchyma of young (20-35 years old) and old (60-80 years old) humans (n = 4-7 individuals per group). Scale bar, 200 µm.D Double-marker immunofluorescence and quantitative analyses of ACE2 intensity level in type II pneumocytic pro-SP-C-positive and CD31-positive endothelia in lungs from young and old mice (n = 3-6 mice per group). Scale bar, 100 µm. a.u. = arbitrary units.E Double-marker immunofluorescence and quantitative analyses of ACE2 intensity level in type II pneumocytic TTF1-positive and CD31-positive endothelia in lungs from young and old humans (n = 4-7 individuals per group). Scale bar, 100 µm. a.u. = arbitrary units.
Figure 2C Representative images and quantitative analyses of ACE2 immunohistochemical staining in lungs of age-matched wild type and G3 Terc-/- mice (n = 3-4 mice per group). Scale bar, 200 µm.D Double-marker immunofluorescence and quantitative analyses of ACE2 intensity level in type II pneumocytic pro-SP-C-positive and CD31-positive endothelia in lungs of age-matched wild type and G3 Terc-/- mice (n = 3-4 mice per group). Scale bar, 100 µm. a.u. = arbitrary units.
Figure 3A Immunofluorescence showing gammaH2AX foci in MEFs Trf2F/F at the indicated time points following 4OHT treatment and consequent TRF2 knockout. Scale bar, 25 µm. B RT-qPCR detection of Ace2 mRNA expression levels in MEFs Trf2F/F treated as in A (n = 3 independent experiments).C Immunofluorescence showing gammaH2AX foci in HeLa shTRF2 cells at the indicated time points following doxycycline treatment and consequent TRF2 knockdown. Scale bar, 25 µm. D RT-qPCR detection of ACE2 mRNA expression levels in HeLa shTRF2 cells treated as in C (n = 6 independent experiments).E Representative immunofluorescence images of 53BP1 staining in liver from Trf2F/F mice treated with tamoxifen (to induce TRF2 loss and telomere uncapping) or vehicle. The animals as been injected also with PBS. Scale bar, 10 µm. F RT-qPCR detection of Ace2 mRNA expression levels in livers of mice treated as in E (n = 5-7 mice per group).
Figure 4B Relative luciferase activity in HeLa shTRF2 following ionizing radiation (5 Gy) or TRF2 knockdown upon doxycycline-induced shTRF2 expression (n=3 independent experiments). Error bars represent the s.e.m. ﻿*P<0.05. Two-way paired ANOVA.
Figure 5A Immunofluorescence showing gammaH2AX foci in Trf2F/F MEFs at the indicated time points following 4OHT treatment and consequent TRF2 knockout and treated with DMSO or ATMi. Scale bar, 25 µm. B RT-qPCR detection of Ace2 mRNA expression levels in MEFs Trf2F/F treated as in A (n = 3 independent experiments).C Representative immunofluorescence images of 53BP1 staining in liver from Trf2F/F mice treated with tamoxifen (to induce telomere uncapping) or vehicle and injected with the indicated ASOs or PBS as control. Scale bar, 10 µm. D RT-qPCR detection of Ace2 mRNA levels in livers of mice treated as in C (n = 5-8 mice per group).E Representative microphotographs and quantitative analyses of ACE2 immunohistochemical staining in lungs of age-matched wild type and G3 Terc-/- mice, treated with the indicated ASOs (n = 4-9 mice per group). Scale bar, 200 µm.F Double-marker immunofluorescence and quantitative analyses of ACE2 intensity level in type II pneumocytic pro-SP-C-positive cells in lungs of age-matched wild type and G3 Terc-/- mice, treated with the indicated ASOs (n = 4-9 mice per group). Scale bar, 100 µm. a.u. = arbitrary units.
Figure 1(A)Profile of transcript levels of autophagy-related genes in iBAT which are significantly modified in cold exposed mice (4ºC, 24h), compared with mice maintained at thermoneutral temperature (29ºC). (Fisher's exact test corrected by the Benjamini-Hochberg method, p< 0.05). Heatmap represents log-fold change of RPKM values of cold versus thermoneutral (TN) sample data obtained from RNAseq analysis. Each square represents replicates (n=4). The most repressed genes are shown on the bottom of the heatmap.Parkin expression in iBAT from mice exposed to cold (4ºC) for 1 day (1d) or 21 days (21d) compared with control mice (ctl) maintained at 22ºC. Left: Relative transcript levels. Right: representative immunoblot and Parkin protein quantification. Ponceau staining (PS) was used as loading control. (n=6; transcript levels) (n=3; protein levels). Data are presented as means ±s.e.m. *p<0.05, **p<0.01, cold vs. control and ##p<0.01, 1d vs. 21d. One-way ANOVA with Tukey's post hoc test.Relative transcript levels of Park2 in sWAT and eWAT. (n= 6). Data are presented as means ±s.e.m. *p<0.05, **p<0.01, cold vs. control and ###p<0.001, 1d vs. 21d. One-way ANOVA with Tukey's post hoc test.Relative transcript levels of Parkin in iBAT, sWAT and eWAT of mice injected with the β3-AR agonist CL316,243, every day for 1 week. (n=6). Data are presented as means ±s.e.m. *p<0.05, ***p<0.001, CL316,243 treatment vs. saline. Two-tailed unpaired Student's t-test.
Figure 2Relative transcript levels of Park2 and Ucp1 in mature brown adipocytes compared with the stromal vascular fraction (SVF) in iBAT. (n=3). Data are presented as means ±s.e.m. **p<0.01, ***p<0.001. Two-tailed unpaired Student's t-test.mRNA expression profiles of Park2 and Ucp1 during differentiation. (n=3). Data are presented as means ±s.e.m. *p<0.05, **p<0.01, ***p<0.001 compared to day (d) 4. Two-tailed unpaired Student's t-test.Relative transcript levels of Park2 and Ucp1 in brown adipocytes in culture with fetal bovine serum (FBS, to trigger in vitro differentiation) or charcoal-stripped serum (CSS, non-permissive for differentiation). (n=3). Data are presented as means ±s.e.m. **p<0.01, ***p<0.001. Two-tailed unpaired Student's t-test.Relative transcript levels of Park2 and Ucp1 in brown adipocytes in culture treated with norepinephrine (NE) or cAMP for indicated times. (n=3). Data are presented as means ±s.e.m. *p<0.05, **p<0.01, ***p<0.001 compared to non-treated cells. One-way ANOVA with Dunnett's post hoc test.Parkin protein levels in brown adipocytes treated with NE or cAMP for the indicated times in the presence or absence of 3-methyladenine (3-MA). Top: Representative immunoblots. p62 and LC3BII proteins are shown as positive controls of 3-MA treatment. β-actin was use as loading control. Bottom: Parkin protein quantification (performed using 3 immunoblots processed in parallel due to sample size). (n=3). Data are presented as means ±s.e.m. *p<0.05, **p<0.01 compared to NE/cAMP non-treated cells. One-way ANOVA with Dunnett's post hoc test.Relative transcript levels of Park2 in brown adipocytes treated with NE in the presence or absence of cycloheximide (CHX). (n=3). Data are presented as means ±s.e.m. *p<0.05, **p<0.01, ***p<0.001. Two-tailed unpaired Student's t-test.Relative mRNA expression levels of Parkin in brown adipocytes treated with NE in the presence or absence of actinomycin D (n=3). Data are presented as means ±s.e.m. One-way ANOVA with Tukey's post hoc test comparing treatments.Park2 gene promoter activity in HIB-1B cells transfected with a pGL4-Park2-Luc reporter construct treated with or without NE or cAMP. Data was normalized using Renilla luciferase activity and are expressed as the relative firefly luciferase activity compared to that in untreated cells. (n=6). Data are presented as means ±s.e.m. *p<0.05 compared to non-treated cells. ANOVA with Dunnett's post hoc testRelative transcript levels of Park2 and Ucp1 in brown adipocytes treated with cAMP (12 h) plus H89 (a PKA inhibitor) or SB202190 (a p38 MAPK inhibitor). (n=3). Data are presented as means ±s.e.m. *p<0.05, **p<0.01 with vs. without inhibitor and #p<0.05, and ##p<0.01, ###p<0.001 with vs. without cAMP. Two-tailed unpaired Student's t-test.
Figure 3Relative transcript levels of Park2, and concentration of glycerol in the culture medium of brown adipocytes treated with cAMP (24h) plus Atglistatin (an adipose triglyceride lipase inhibitor) or CAY10499 (a hormone sensitive lipase inhibitor). (n=3). Data are presented as means ±s.e.m. *p<0.05, **p<0.01 ***p<0.001 with vs. without inhibitor and #p<0.05, and ##p<0.01, ###p<0.001 with vs. without cAMP. Two-tailed unpaired Student's t-test.Relative transcript levels of Park2 and Ucp1 in brown adipocytes treated for 24h with a PPARα activator (GW7647), a PPARα inhibitor (GW6471) with or without norepinephrine (NE), or all-trans-retinoic acid (RA). (n=3). Data are presented as means ±s.e.m. *p<0.05, **p<0.01 ***p<0.001. Two-tailed unpaired Student's t-test.Relative transcript levels of Park2 in wild-type and PPARα-KO brown adipocytes treated for 24h with NE (n=3). Data are presented as means ±s.e.m. *p<0.05. ANOVA with Tukey's post hoc test.Park2 gene promoter activity in HIB-1B cells transfected with a pGL4-Park2-Luc reporter construct and, when indicated, with a pSG5-Ppara expression vector. Cells were treated with the PPARα activator GW7647 or NE. Data was normalized using Renilla luciferase activity and are expressed as the relative firefly luciferase activity compared to that only transfected with the pGL4-Park2-Luc construct (n=6). Data are presented as means ± s.e.m. *p<0.05 compared to non-treated cells. ANOVA with Dunnett's post hoc test.
Figure 4Left: Representative optical microscopic images of H&E-stained iBAT (scale bars, 110µm) and electron microscopic images of iBAT (scale bars, 20µm) from wild-type (WT) and Parkin-KO (KO) mice. Right: Quantification of lipid droplet area from electron microscopic images (10 images per condition were used, n =3 WT, n=3 Parkin-KO). Data are presented as means ±s.e.m. *p<0.05. Two-tailed unpaired Student's t-test.Representative thermal images (left) and quantification of surface temperature (right) for the interscapular region. (n=6). Data are presented as means ±s.e.m. ***p<0.001. Two-tailed unpaired Student's t-test.Representative immunoblot of UCP1 protein and the loading control (Ponceau staining, PS) in iBAT samples.Relative transcript levels of thermogenesis-related genes of iBAT from WT and Parkin-KO mice exposed to acute cold (4ºC, 24h) compared to those maintained at the control temperature (22ºC). (n=8; WT) (n=6; Parkin-KO). Data are presented as means ±s.e.m. *p<0.05, **p<0.01, ***p<0.001, CTL vs. cold; #p<0.05, WT vs. Parkin-KO. ANOVA with Tukey's post hoc test.Weight gain from WT and Parkin-KO mice fed with chow (CD) or high fat diet (HFD). (n=8; WT) (n=6; Parkin-KO)., blood glucose levels and plasma insulin levels from WT and Parkin-KO mice fed with chow (CD) or high fat diet (HFD). (n=8; WT) (n=6; Parkin-KO).insulin tolerance test (ITT) from WT and Parkin-KO mice fed with chow (CD) or high fat diet (HFD). (n=8; WT) (n=6; Parkin-KO).Relative transcript levels of thermogenesis-related genes in iBAT from WT and Parkin-KO mice given HFD. (n=8; WT) (n=6; Parkin-KO). Data are presented as means ±s.e.m. #p<0.05. Two-tailed unpaired Student's t-test.Relative transcript levels of Park2 in iBAT from WT mice fed CD or HFD. (n=8; WT) (n=6; Parkin-KO). Data are presented as means ±s.e.m. Two-tailed unpaired Student's t-test.
Figure 5WT mice were acclimated to cold for 21 days (21d, 4ºC) and then deacclimated at thermoneutrality (29ºC) for 1 day (1d) or 7 days (7d). Top: Total protein content in iBAT during cold deaclimation. (n=6). Data are presented as means ±s.e.m. *p<0.05, **p<0.01 compared to 21d. ANOVA with Dunnett's post hoc test. Bottom: Representative optical microscopic images of H&E-stained iBAT (scale bars, 100µm) and electron microscopic images of iBAT (scale bars, 10µm).WT mice were acclimated to cold for 21 days (21d, 4ºC) and then deacclimated at thermoneutrality (29ºC) for 1 day (1d) or 7 days (7d). Relative transcript levels of thermogenesis-related genes and Park2 in iBAT. (n=6). Data are presented as means ±s.e.m. *p<0.05, **p<0.01, ***p<0.001 compared to 21d. ANOVA with Dunnett's post hoc test.WT mice were acclimated to cold for 21 days (21d, 4ºC) and then deacclimated at thermoneutrality (29ºC) for 1 day (1d) or 7 days (7d). Representative immunoblot of the indicated thermogenic and autophagic proteins in iBAT during cold acclimation and deacclimation. PS: Ponceau staining.WT mice were acclimated to cold for 21 days (21d, 4ºC) and then deacclimated at thermoneutrality (29ºC) for 1 day (1d) or 7 days (7d). Representative immunoblot of Parkin phosphoSer65 and total Parkin in whole lysates of iBAT and after Parkin immunoprecipitation. Arrowheads indicate Parkin 52kDa band and asterisk indicates a non-specific band.WT mice were acclimated to cold for 21 days (21d, 4ºC) and then deacclimated at thermoneutrality (29ºC) for 1 day (1d) or 7 days (7d). Representative electron microscopic images of autophagic and mitophagic events in iBAT after 1 day of cold deacclimation. Yellow arrowheads indicate mitochondrial cristae, blue arrowheads indicate double-membrane autophagosomes, and red arrowheads indicate structures compatible with mitochondria-derived vesicles. LD: lipid droplet. Scale bars, 1 µm.
Figure 6Wild-type (WT) and Parkin-KO (KO) mice were acclimated to cold for 21 days (c) and then deacclimated at thermoneutrality (29ºC) for 1 day (d). Representative immunoblot of LC3B in iBAT, and the loading control (Ponceau staining, PS).Wild-type (WT) and Parkin-KO (KO) mice were acclimated to cold for 21 days (c) and then deacclimated at thermoneutrality (29ºC) for 1 day (d). Immunoblot for p62 and OPTN (left) and its quantification (right) in iBAT. PS was used as the loading control. Arrowhead indicates p62 band and asterisk indicates a non-specific band. (n=4; cold) (n=3; deacclimation). Data are presented as means ±s.e.m. **p<0.01. ANOVA with Tukey's post hoc test.Wild-type (WT) and Parkin-KO (KO) mice were acclimated to cold for 21 days (c) and then deacclimated at thermoneutrality (29ºC) for 1 day (d). Quantification of the total protein amounts of the indicated OXPHOS protein subunits and UCP1 in iBAT. (n=4; cold) (n=3; deacclimation). Data are presented as means ±s.e.m. *p<0.05. ANOVA with Tukey's post hoc test.Wild-type (WT) and Parkin-KO (KO) mice were acclimated to cold for 21 days (c) and then deacclimated at thermoneutrality (29ºC) for 1 day (d). Citrate synthase activity in iBAT protein extracts. (n=6; WT) (n=8; Parkin-KO). Data are presented as means ±s.e.m. *p<0.05. ANOVA with Tukey's post hoc test.Wild-type (WT) and Parkin-KO (KO) mice were acclimated to cold for 21 days (c) and then deacclimated at thermoneutrality (29ºC) for 1 day (d). Mitochondrial DNA (mtDNA) content in iBAT relative to nuclear DNA (nDNA). (n=6; WT) (n=8; Parkin-KO). Data are presented as means ±s.e.m. *p<0.05. ANOVA with Tukey's post hoc test.Wild-type (WT) and Parkin-KO (KO) mice were acclimated to cold for 21 days (c) and then deacclimated at thermoneutrality (29ºC) for 1 day (d). Representative electron microscopic images of mitochondrial integrity and autophagic/mitophagic events in iBAT after 1 day of cold-deacclimation. Yellow arrowheads indicate mitochondria cristae and blue arrowheads indicate double-membrane autophagosomes. Left panels scale bars, 2 µm. Right panels scale bars, 1 µm.