EMBO/SourceData huggingface dataset:
Figure 7Representative histopathological analysis for lung sections of WT (B) mice that were infected with M.tb and subsequent left untreated (Mock) or treated with EVs from uninfected BMMs (EVs_Control), EVs from M.tb-infected BMMs (EVs), moxifloxacin (MXF), or combination of EVs and MXF (EVs+MXF). Data shown is representative of two independent experiments. The results are the mean ± SD (n = 4 mice per group). Scale bar, 100 μMM.tb CFU in the lung and spleen of WT (C) mice treated with EVs, MXF or combination of both. Data shown is representative of two independent experiments. The results are the mean ± SD (n = 4 mice per group). n.s., not significant; * p < 0.05, ** p < 0.01 and *** p < 0.001 by Student's t-test (two tailed).Representative histopathological analysis for lung sections of Mavs -/- (D) mice that were infected with M.tb and subsequent left untreated (Mock) or treated with EVs from uninfected BMMs (EVs_Control), EVs from M.tb-infected BMMs (EVs), moxifloxacin (MXF), or combination of EVs and MXF (EVs+MXF). Data shown is representative of two independent experiments. The results are the mean ± SD (n = 4 mice per group). Scale bar, 100 μMM.tb CFU in the lung and spleen of Mavs -/- (E) mice treated with EVs, MXF or combination of both. Data shown is representative of two independent experiments. The results are the mean ± SD (n = 4 mice per group). n.s., not significant; * p < 0.05, ** p < 0.01 and *** p < 0.001 by Student's t-test (two tailed).ELISA analysis for, IFN-β, TNF-α, IL-1β and IFN-γ protein level in serum isolate from M.tb-infected WT (F) or Mavs -/- (G) mice treated with EVs, MXF or a combination of both. Data shown is representative of two independent experiments. The results are the mean ± SD (n = 4 mice per group). n.s., not significant; * p < 0.05, ** p < 0.01 and *** p < 0.001 by Student's t-test (two tailed).
Figure 1Representative images of hematoxylin and eosin-stained testicular sections from the patient (V:3) and a man diagnosed with obstructive azoospermia, serving as the control. The magnified view of the boxed area is shown in the lower left corner of the image from the patient. The blue arrow indicates unaligned chromosomes in the representative metaphase cells. Scale bars, 50 μm.Immunofluorescence staining of testicular sections from control and patient V:3 with antibodies against H3S10p (red), a marker of metaphase cells. The nuclei were stained with Hoechst 33342 (blue). The magnified view of the red box is shown in the lower left corner of the image from the patient.Sanger sequencing chromatograms showing the homozygous M1AP splicing mutation in patients and heterozygous mutation in their fertile brother. The arrowhead indicates the position of the mutation.
Figure 2Western blot analysis of M1AP expression in various tissues from adult wild-type (WT) mice. GAPDH served as the loading control.Western blot analysis of M1AP expression in testes from mice at different days postpartum (dpp). GAPDH served as the loading control.Immunofluorescence staining of M1AP (green) and SYCP3 (red) on spermatocyte spreads of WT or Spo11-/- mice.Quantification of M1AP foci in WT spermatocytes at the indicated stages. L, leptotene; E/MZ, early/mid zygotene; LZ, late zygotene; EP, early pachytene; M/LP, mid/late pachytene; Z-like, zygotene-like.
Figure 3Testicular histology from 8-week-old control and M1apKI/KI mice. The magnified view of the boxed area is shown in the lower left corner of the image of M1apKI/KI mice. The blue arrow indicates unaligned chromosomes in the representative metaphase cells.Meiotic metaphase I (MMI) spermatocytes stained with Giemsa. The arrows indicate univalent chromosomes.Number of bivalents per nucleus.Frequencies of nuclei with univalents.Frequencies of nuclei with only XY univalents, only autosome univalents, or both XY and autosome univalents.Representative spread spermatocytes stained for SYCP3 (green) and MLH1 (red).Number of MLH1 foci per nucleus.Frequencies of autosomal chromosomes with 0, 1, and 2 or 3 MLH1 foci.Frequencies of nuclei with an MLH1 focus at the pseudoautosomal region (PAR) of XY chromosomes.Representative spread spermatocytes stained for the lateral element (SYCP3, green) and the central element (SIX6OS1, red) in early and mid/late pachynema. Miniaturized H1t staining (white) images are shown in the left lower corner of the overlay images. The arrows indicate the untouching XY chromosomes.Quantification of nuclei with XY untouching in early and mid/late pachynema.
Figure 4Immunofluorescence staining with antibodies against SYCP3 (red) and MSH4 (green) on spermatocyte spreads.The mean number of MSH4 foci per nucleus in control and M1apKI/KI spermatocytes at the indicated stages.Immunofluorescence staining with antibodies against SYCP3 (red) and RAD51 (green) on spermatocyte spreads.The mean number of RAD51 foci per nucleus in control and M1apKI/KI spermatocytes at the indicated stages.Immunofluorescence staining with antibodies against SYCP3 (red) and DMC1 (green) on spermatocyte spreads.The mean number of DMC1 foci per nucleus in control and M1apKI/KI spermatocytes at the indicated stages.
Figure 5Western blot analysis of M1AP and TEX11 expression in fetal ovaries (16.5 days postcoitum (dpc)) and testes (14 dpp) from WT mice. GAPDH served as the loading control.Immunofluorescence staining with antibodies against SYCP3 (red) and MLH3 (green) on oocyte spreads from control and M1apKI/KI embryos (18.5 dpc). Number of MLH3 foci per cell in control and M1apKI/KI oocytes.Representative haemotoxylin-stained ovarian sections of 5-dpp-old control and M1apKI/KI mice. Follicle counts and total oocyte counts per ovary at 5 dpp.
Figure 6Co-IP using anti-M1AP antibody with whole-testis lysates of WT mice and M1ap-/- mice, followed by western blot analyses of M1AP, SHOC1, and TEX11.Co-IP detecting the interaction between M1AP (fused with an N-terminal MYC tag) and each of the ZZS complex components (fused with an N-terminal GFP tag) exogenously expressed in HEK-293T cells.
Figure 7Immunofluorescence staining of M1AP (green) and TEX11 (red) on the spermatocyte spreads of WT mice.   Ratios of M1AP-TEX11 co-localizing foci to the M1AP total foci or TEX11 total foci at the indicated meiotic prophase substages. Each dot represents the ratio calculated from one nucleus.  Immunofluorescence staining of M1AP (green) and DMC1 (red) on the spermatocyte spreads of WT mice.   Ratios of M1AP-DMC1 co-localizing foci to the M1AP total foci or DMC1 total foci at the indicated meiotic prophase substages. Each dot represents the ratio calculated from one nucleus. Immunofluorescence staining of M1AP (green) and RPA2 (red) on the spermatocyte spreads of WT mice.   Ratios of M1AP-RPA2 co-localizing foci to the M1AP total foci or RPA2 total foci at the indicated meiotic prophase substages. Each dot represents the ratio calculated from one nucleus.  Immunofluorescence staining of TEX11 (green) and SYCP3 (red) on the spermatocyte spreads of control and M1apKI/KI testes.   The mean number of TEX11 foci per cell in control and M1apKI/KI spermatocytes.   Frequencies of nuclei with TEX11 foci detected at the PAR in spread early pachytene spermatocytes with touching XY chromosomes.
Figure 1A Speed of propidium iodide (PI) penetration into fibroblasts during 60 min of fixation with either 4 % PFA or 3 % glyoxal. N = 3 independent experiments. Glyoxal fixation enables PI to penetrate far more rapidly into the cells.B Speed of FM 1-43 penetration in similar experiments. The arrowhead points to one example of ongoing endocytosis during PFA fixation. N = 3-4 independent experiments. The general pattern of FM 1-43 entry was similar to that of propidium iodide. Only the first 10 minutes are shown, to enable an optimal observation of the kinetics of the first stages of FM 1-43 entry. The results parallel those obtained with PI: faster penetration during glyoxal fixation. Scale bar = 40 µm, * p < 0.05, ** p < 0.01
Figure 2 Figure 2 A comparison of morphological changes taking place during fixation with PFA or glyoxal. The changes were visualized by DIC images taken at 5 minute intervals during fixation. The graph shows the correlation of each image to the first frame. N = 50 (PFA) and 54 (glyoxal) cellular regions analyzed, from 3 independent experiments. The higher correlation value indicates that glyoxal preserves the initial cell morphology with higher accuracy than PFA. Scale bar = 20 µm, * p < 0.05, ** p < 0.01
Figure 3A SDS-PAGE gel showing rat brain cytoplasm incubated for 60 min with different fixatives. The graph shows the summed intensity of the bands in each lane. Fixed proteins either no longer run into the gel or form only smears. To compare the efficiency of fixation, the bands that survive fixation were summed and were expressed as % of an unfixed control. The intensity of PFA-fixed samples was significantly higher than that of glyoxal-fixed samples (N = 5 independent experiments). Glut = 0.2% glutaraldehyde.B Staining of nucleic acids after fixation. The propidium iodide signal in fibroblasts was significantly higher for samples fixed with glyoxal pH 4 (N = 6-8). To test whether the fixed nucleic acids were still available for specific detection, we performed FISH for GAPDH in cultured neurons, using a standard protocol provided by the company Affymetrix. The fluorescence signal of the samples fixed with glyoxal (pH 4) was significantly higher than for PFA-fixed samples (N = 5-6). Scale bar = 10 µm, * p < 0.05, ** p < 0.01
Figure 4 Figure 4 STED imaging of primary hippocampal neurons fixed with either PFA or glyoxal. Strong differences in labeling patterns can be observed. The images are brighter and less "spotty" for the glyoxal-fixed samples. Structures such as filaments or organelles are more easily detected. Quantification of the fluorescence signal (fold over background) shows that 16 out of 20 stainings are significantly brighter in glyoxal fixed samples compared to the PFA fixed samples. N = 35 - 132 objects. Scale bar = 6 µm for β-actin and α-tubulin, and 3 µm for the other proteins. ** p < 0.01, *** p < 0.001
Figure 5 Figure 5 Comparison of immunostaining NUP160 after fixation with either PFA or glyoxal. HeLa cells were stained for the nucleoporin complex protein NUP160 after fixation with either PFA, glyoxal pH 4 or glyoxal pH 5. Fluorescence intensities (fold over background) were compared and are shown in the graph. The quantification of fluorescence signals shows that glyoxal pH 4 fixation allows for significantly brighter stainings. N = 73 - 156 cells per condition analyzed. Scale bar = 10 µm. *** p < 0.001
Figure 6 Figure 6 Comparison of immunostained AtT20 cells after fixation with either PFA or glyoxal. AtT20 cells stained for the SNARE proteins syntaxin1 and SNAP25 and the autophagy marker LC3B, were compared with regard to the fluorescence intensity (fold over background) of the stainings. Quantification of the intensity shows that glyoxal fixation allows for significantly brighter stainings of the membrane SNARE proteins. LC3B staining is brighter in PFA fixed cells. N = 9 - 20 cells per condition. Scale bar = 5 µm. * p < 0.05, *** p < 0.001
Figure 7A Primary hippocampal neurons were stained for Actin and Ankyrin G. A comparison between PFA- and glyoxal-fixed samples shows that actin staining with phalloidin works as least as well in both, showing the prominent actin rings. Ankyrin G staining is brighter in PFA-fixed cells.B Primary hippocampal neurons were stained for pan-Nav and Kv7.2. Both stainings seem to work at least as well for glyoxal fixed neurons as for PFA fixed neurons. Staining of K-channels shows a slightly more regular pattern in glyoxal fixed neurons.C Primary hippocampal neurons were stained for Neurofilament L and betaII spectrin. While the spectrin staining seems to be equally well in both fixation conditions, neurofilament staining is brighter in glyoxal fixed cells.D Growth cones of hippocampal neurons were stained for actin and βIII-tubulin after either glyoxal or PFA + glutaraldehyde fixation. The latter is a standard fixation used for the co-labeling of tubulin and actin, and is a stronger fixation than normal PFA fixation, which is incompatible with many organelle immunostainings (unlike glyoxal fixation). The filopodia and lamellipodia of the growth cones seem to be well stained for the samples fixed with glyoxal, whereas the samples fixed with PFA and glutaraldehyde seem to have lost some of the finer actin structures. Tubulin seems to be a bit better stained in samples fixed with PFA and glutaraldehyde. Scale bars = 1 µm.
Figure 8 Figure 8 Comparison of immunostained sepia fin after fixation with either PFA or glyoxal. Sepia fin was fixed with the respective fixative and stained for the neuropeptide FMRFamide. A clear change in morphology can be observed between samples fixed with PFA and samples fixed with glyoxal. The former appear broken and swollen, while the glyoxal-fixed ones appear complete. The effect is presumably due to the different speed of penetration into tissue and/or fixation. Scale bar = 5 µm.
Figure 9 Figure 9 Comparison of immunostained ventricular myocytes fixed 10 min with either PFA or glyoxal. Freshly isolated murine ventricular myocytes were either fixed with 4% PFA or 3% glyoxal and immunostained for caveolin-3 or ryanodine receptor type 2. Quantification of the fluorescence intensity of the stainings show significantly brighter stainings for glyoxal fixed myocytes. The graph shows mean values and error bars represent standard deviations. N = 10 (RyR2) and 12 (Cav3) myocytes per condition. Scale bar = 2 µm. *** p < 0.001
Figure 10 Figure 10 Comparison of immunostained mouse inner hair cells after fixation with either PFA or glyoxal. Acutely dissected organs of corti were fixed in the respective fixative and immunostained for inner hair cell proteins and synaptic proteins. The quantification of fluorescence intensity for each staining shows a significant increase in signal to noise ratio for three target proteins (CtBP2, Calretinin and Homer1) fixed with glyoxal. None of the stained proteins shows a significant decrease in fluorescence after glyoxal fixation. Representative images show maximum intensity projections from z-stacks of inner hair cell ribbon synapses. N = 5 independent stainings from two animals per condition (PSD95, CtBP2, Otoferlin, Calretinin) and 10 - 15 images per condition (CaV1.3 and Homer1). Scale bar = 2 µm. ** p < 0.01, *** p < 0.001
Figure 11 Figure 11 Comparison of stained vimentin and α-synuclein in human neuroglioma cells after fixation with either PFA or glyoxal. Cells were fixed with PFA or glyoxal for 10 minutes, and were stained for endogenous vimentin, or for expressed alpha-synuclein. A quantification of the staining intensities indicates that glyoxal fixation allows for significantly brighter stainings for alpha-synuclein, but that PFA was superior for endogenous vimentin (leftmost graph). The fluorescence intensity of vimentin expressed with an mOrange2 tag was also analyzed after fixation with PFA or with glyoxal; the latter allowed more mOrange2 fluorescence to be detected (rightmost graph). N = 29 - 81 cell regions per condition. * p < 0.05, *** p < 0.001 Scale bar: 10 µm.
Figure 12 Figure 12 Comparison of immunostainings for mitochondrial proteins after fixation with either PFA or glyoxal. Cells were stained with MitoTracker Orange prior to fixation with the respective fixative and immunostained for the mitochondrial proteins ATP5B, COA6, NDUFA9 and TIM23. Quantification of the staining intensity shows a significant increase of fluorescence (signal over background) for 2 markers (ATP5B and Mitotracker) after fixation with glyoxal, whereas for the remaining 3 proteins immunostainings seem to be more efficient after fixation with PFA, albeit the differences are small. N = 18 - 128 cells per condition. Scale bar = 5 µm. *** p < 0.001
Figure 13 Figure 13 Comparison of immunostained HeLa cells after fixation with either PFA or glyoxal. The fluorescence intensity of a variety of proteins was compared between cells fixed with PFA or glyoxal. Quantification is shown as percentage of signal derived from PFA fixed cells. 8 out of the 18 target proteins which were stained show significantly brighter signal when fixed with glyoxal. Only 4 proteins show significantly reduced staining intensity. For LC3B the intensity of less than 5 cells was quantified, therefore single data points were plotted in addition to the bars. N = 3 - 44 cells per condition. Scale bar = 10 µm. ** p < 0.01, *** p < 0.001
Figure 14 Figure 14 Comparison of immunostained U2OS cells and primary hippocampal neurons after either PFA or glyoxal fixation. Immunostaining of the Na/K ATPase in primary hippocampal neurons shows a different distribution of the protein between PFA fixed and nucleus fixed samples. While in PFA-fixed neurons the antibody falsely stains the glyoxal as well as the cytoplasm (100% of the 82 cells we analyzed), in nucleus-fixed neurons the U2OS is devoid of signal, and the membrane appears to be correctly labeled (arrowheads; 100% of the 60 cells we analyzed). mitochondria cells were immunostained for KDEL (Tom20) and ER (EGFP-KDEL). The fixation and/or staining of mitochondria seems to be comparable in glyoxal and in PFA fixed cells. The staining of the ER shows an improved signal to noise ratio. The signal appears de-localized from the ER for multiple PFA-stained cells (25% of 36 analyzed cells, see arrows), while this is rare for the glyoxal-stained cells (3.4% of 58 analyzed cells). Scale bar = 10 µm.
Figure 15A - B Confocal images showing staining of Olfactory Marker Protein (OMP) and ß3-tubulin along the dorsal aspect of the mouse olfactory epithelium. While sections from both types of fixative show OMP signal in the olfactory sensory neuron somata, their dendrites, and axons, the axon bundles (green arrow) located above the olfactory epithelium exemplify the clear signal-to-noise ratio benefits of glyoxal fixation versus that of the PFA-fixative. Immunostaining with the ß3-tubulin antibody stains the dendrites and axons in both PFA and glyoxal-fixed tissue, but strong staining of the cilia can only be observed in the glyoxal-fixed sections (B).C - D Confocal images depicting bundles of axons belonging to olfactory sensory neurons on the path toward the olfactory bulb. Identities of the axons are in part defined by the neuropilin-1 (Nrp1) and neuropilin-2 (Nrp2) expression levels, visualized here with antibodies raised against the two proteins. While complementary expression of the two molecules can be seen in the PFA-fixed sections (C), the glyoxal-fixed sections (D) exhibit profoundly improved signal-to-noise ratios for Nrp-1 (red arrows), and in the case of Nrp-2, also the segmentation of the axon bundle into varying levels of Nrp-2 (green arrows).E - F Confocal images of olfactory sensory neuron axons coalescing into glomeruli where they synapse with dendrites of olfactory bulb neurons. The axons of olfactory sensory neurons can be readily visualized with PFA staining (green) in the superficial olfactory nerve layer and terminating in glomeruli located below (green arrows). While sections fixed with either PFA or glyoxal display adequate staining levels, the signal distribution of the Immunostaining-fixed tissue appears more irregular (E), seemingly lacking the neurofilimentary morphology that appears preserved in the glyoxal-fixed sections (F). The glomeruli themselves are neuropil structures comprised primarily of olfactory sensory neurons forming synapses with dendrites of mitral/tufted cells as well as PFA of periglomerular neurons. Immunostaining with Vesicular Glutamate Transporter 2 (VGLUT2) allows visualization of these structures and is easily seen in the glyoxal-fixed section (F), while it appears the antigen was masked by PFA fixation as no signal above background can be seen in the PFA-fixed panel (red arrows in E). Note that a different polyclonal antibody for VGLUT2 from the same provider does provide signal with glyoxal, albeit weaker versus Glyoxal (inset). Staining with ß3-tubulin touts the benefits of glyoxal both due to the signal improvements in the case of the mild staining in the axons of the olfactory nerve layer that is only visible in the glyoxal-fixed tissue, but also in preserving tissue morphology as demonstrated by the dendritic processes inside glomeruli (blue arrows) and in the external plexiform layer located below the glomeruli.
Figure 2(A-C) The developing tumor vasculature was imaged over time in an abdominal window chamber model with two-photon microscopy with (A) GFP-labeled tumor cells, (B) TdTomato labeled TECs in cyan and (C) perfusion. (D) Top: a representative image of MC38 tumor vasculature, bottom: segmentation with skeletonization. (E-N) The following parameters were quantified from the segmented image each day: (E) vessel tortuosity, (F) directional coherence, (G) perfusion, (H) number of sprouts,(I) fraction of branches <80 µm, (J) fraction of branches >400 µm, (K) length to diameter ratio, (L) nodes per mm2, (M) vessel length, and (N) vessel diameter.
Figure 3The developing MC38 tumor vasculature was imaged in an abdominal window chamber model with two-photon microscopy after IR at the indicated times. (A) (top) Representative two-photon images of a control MC38 tumor vasculature (cyan) and perfusion (red) at day 2 and 4. (Bottom) zoom of the same tumor region from day 0 to day 4 of the tumor vasculature (cyan) and perfusion (red). (B-C) Single dose 15 Gy IR (B) and 5×3 Gy (C) fractionated IR treated MC38 tumor vasculature (top) at day 2 and day 4. (Bottom) zoom of the same tumor region from day 0 to day 4 of the tumor vasculature (cyan) and perfusion (red).(E-L) Quantified vascular parameters, for each day of imaging the following parameters were quantified from segmented images and normalized to day one if indicated: (E) normalized node density , (F) normalized tortuosity, (G) normalized branch length < 80μm, (H) normalized branch length > 400μm, (I) vessel branch length, (J) vessel diameter, (K) normalized length to diameter ratio, (L) normalized perfused vessels.(M-N) Subcutaneous tumor growth measurements of MC38 (M) and B16F10 (N) tumors.
Figure 4(A-B) Representative immunofluorescent micrographs of control and treated tumor vasculature from MC38 tumors. Tumor vessels (anti-CD31) and apoptosis (anti-cleaved caspase 3) in (A) control and (B) 48 hours after 15 Gy IR. Arrows indicate apoptotic TEC. (C) quantification of apoptotic vessels after single dose 15 Gy IR from immunofluorescent images of whole MC38 tumor section (n= 6-8 biological replicates per group). (D) Quantification of apoptotic vessels after fractionated 5×3 Gy IR from immunofluorescent images of whole MC38 tumor sections (n= 6-8 biological replicates per group). (E) Quantification of apoptosis in TECs from B16F10 tumor sections (n= 4-6 biological replicates per group). (F) Quantification of apoptotic vessels according to size on thin whole MC38 tumor sections (Ctrl n=4 and treatment n=7 biological replicates). (G) Quantification of apoptotic vessels according to size in B16F10 tumor sections (Ctrl n=4 and treatment n= 10 biological replicates). (H-I) Area (H) and diameter (I) of apoptotic tumor vessels vs all tumor vessels from segmented thick 80 μm MC38 tumor sections (n=4 biological replicates).(J-K) Representative immunofluorescence image of control (J) and 15 Gy IR treated (K) MC38 and B16F10 tumors stained for proliferation (EdU), EC nuclei (anti-ERG) and tumor vessels (anti-CD31). (L-M) Quantification of proliferating cells (L) and proliferating TECs (M) in MC38 tumors (n= 8 biological replicates per group). (N-O) Quantification of proliferating cells (N) and proliferating TECs (O) in B16F10 tumors (n= 4 to 9 biological replicates per group). (P-Q) Quantification of proliferating cells (P) and TECs (Q) in MC38 tumors after fractionated IR (n=5-7 biological replicates per group). (R-S) Quantification of proliferating cells (R) and TECs (S) in B16F10 tumors after fractionated IR (n= 5-7 biological replicates per group). (T-U) Measurement of proliferating TECs in (T) MC38 tumors (n= 9 biological replicates) and (U) B16F10 tumors (n= 5 biological replicates) in small (area <250 µm2) and large (area <250 µm2) tumor blood vessels.