Journal: The Journal of Biological Chemistry

Article Title: Rab5 nucleotide binding promotes oxidative metabolism to fuel hepatocellular carcinoma cell proliferation

doi: 10.1016/j.jbc.2026.111321

Figure Lengend Snippet: Enhanced recruitment of Rab5 to lipid droplets (LDs) upon lipophagy stimulation . A , Western blot analysis of Rab5 and EEA1 GTP-pulldown in regular medium (CT) or 4 h HBSS starvation in Hep3B cells. B , quantification of the fold change of GTP-bound/total Rab5 as well as EEA1 from n = 4 independent experiments. C , quantification of total Rab5–β-actin confirming that starvation does not change overall Rab5 expression. D , Western blot analysis of LDs isolated from Hep3B cells by density gradient centrifugation showing abundant levels of Rab5 in isolated LDs following 4 h of HBSS starvation compared with the regular medium (CT). E , quantification of Rab5–Plin2 in the biochemically isolated LDs. F , fluorescence micrograph showing immunofluorescence staining of Hep3B cells expressing Myc-tagged Rab5 ( green ). Cells were treated with oleic acid for 16 h and then either maintained in regular medium (control) or subjected to 4 h of HBSS starvation before being fixed and stained with Oil Red O (ORO; red ) to label LDs. Note the marked increase in Rab5 staining around LDs in HBSS-starved cells versus control ( yellow arrowheads ). Graphs represent mean ± SD from n = 3 to 4 independent experiments. Statistical significance was determined using an unpaired two-tailed t test. ∗ p < 0.05, ∗∗ p < 0.01, and ∗∗∗ p < 0.001. CT, control; EEA1, early endosome antigen 1; HBSS, Hank’s balanced salt solution; Plin2, perilipin-2.

Article Snippet: Antibodies against Rab5A (2143S), PLIN2 (95109), and EEA1 (2411S) were purchased from Cell Signaling Technology.

Techniques: Western Blot, Expressing, Isolation, Gradient Centrifugation, Fluorescence, Immunofluorescence, Staining, Control, Two Tailed Test

Journal: The Journal of Biological Chemistry

Article Title: Rab5 nucleotide binding promotes oxidative metabolism to fuel hepatocellular carcinoma cell proliferation

doi: 10.1016/j.jbc.2026.111321

Figure Lengend Snippet: Inhibition of Rab5 GTPase activity reduces lipid droplet (LD) catabolism via its GTPase activity . A , Western blot analysis of Rab5 and EEA1 GTP-pulldown in Hep3B cells treated with DMSO (CT) or NAP (100 μM, 48 h). B , quantification of GTP/total Rab5 as well as EEA1 from n = 3 independent experiments. C , confocal micrograph showing ORO-stained LDs ( red ) and DAPI-stained nuclei from Hep3B cells treated with DMSO (control) and NAP (100 μM). D , bar graphs depict quantification of LD number/cell, total LD area/cell, and LD size. E , confocal micrograph showing ORO-stained LDs (red ) and DAPI-stained nucleus from Hep3B cells treated with DMSO (control) and NAP (100 μM) with oleic acid (OA, 150 μM). F , bar graphs depict quantification of LD number/cell, total LD area/cell, and LD size. G , cartoon depicting NAP alteration of Rab5 GTP binding. Graphs represent mean ± SD from n = 3 independent experiments. Statistical significance was determined using an unpaired two-tailed t test. ∗ p < 0.05, ∗∗ p < 0.01, and ∗∗∗ p < 0.001. CT, control; DAPI, 4′,6-diamidino-2-phenylindole; DMSO, dimethyl sulfoxide; EEA1, early endosome antigen 1; NAP, neoandrographolide; ORO, Oil Red O.

Article Snippet: Antibodies against Rab5A (2143S), PLIN2 (95109), and EEA1 (2411S) were purchased from Cell Signaling Technology.

Techniques: Inhibition, Activity Assay, Western Blot, Staining, Control, Binding Assay, Two Tailed Test

Journal: Neoplasia (New York, N.Y.)

Article Title: Rational payload selection enables high antitumoral efficacy of an anti-EGFR antibody-drug conjugate against ovarian tumors

doi: 10.1016/j.neo.2026.101295

Figure Lengend Snippet: Internalization of cetuximab-vc-MMAF. A. OVCAR8 cells were treated with 10 nM cetuximab-vc-MMAF (red) at 37°C for the indicated times. For time 0 h, cells were incubated on ice for 30 minutes to visualize membrane staining. Nuclei were stained with Hoechst 33342 in all cases. Scale bar: 10 μm. B. Colocalization of cetuximab-vc-MMAF (red) with endocytic markers (green). Cells were treated as above, and colocalization (yellow) with markers for early endosomes (EEA1), late endosomes (RAB7), and lysosomes (LAMP1) analysed at the indicated times. Scale bar: 5 μm. C. Quantitation of colocalization was performed using ImageJ and expressed as a percentage. Data are presented as the mean ± SD of 10 fields per time point, for each vesicle type.

Article Snippet: The antibodies directed to EEA1, RAB7, LAMP1, β-tubulin, cleaved caspase-3, pRb (Ser780), and pH2AX were from Cell Signaling Technology (Danvers, MA, USA).

Techniques: Incubation, Membrane, Staining, Quantitation Assay