Journal: Journal of Pharmaceutical Analysis
Article Title: Naringenin boosts Parkin-mediated mitophagy via estrogen receptor alpha to maintain mitochondrial quality control and heal diabetic foot ulcer
doi: 10.1016/j.jpha.2025.101333
Figure Lengend Snippet: Naringenin (NAR)'s effects on diabetic wound healing are abolished in E3 ubiquitin-protein ligase parkin (Parkin/PRKN/Prkn) deficiency mice. (A) Flowchart of Prkn knockout ( Prkn − /− ) diabetic foot ulcer (DFU) murine model construction and treatment. The four-week-old male Prkn − /− mice were utilized to confirm the role of Parkin in NAR's effects on DFU. After genotyping, the mice were intraperitoneally injected with streptozotocin (STZ) at a dose of 50 mg/kg for five consecutive days. Circular wounds of 6-mm diameter on the back of mice with fasting blood glucose (FBG) level above 200 mg/dL were created by a skin sampler. Blank or 5% NAR ointment was applied around the wounds for 10 consecutive days after injury. Each group of mice was maintained on a normal chow diet (CD) throughout the experiment. (B) Representative images of the skin wounds of Prkn − /− mice on days 0, 1, 3, 5, 7, and 9 post-puncture ( n = 5). (C) Wound closure rates in B were calculated using images captured on days 1, 3, 5, 7, and 9 through ImageJ. (D) Representative images of histological assessment of gap closure in the wound epithelia of Prkn − /− mice on day 9 post-puncture. (E–H) Representative immunohistochemistry (IHC) staining images of Parkin (E), proliferation marker protein Ki67 (F), caveolin-1 (Cav-1) (G), and nicotinamide adenine dinucleotide phosphate (NAD(P)H):quinone oxidoreductase 1 (NQO1) (H) in the wound of Prkn − /− mice on day 9 post-puncture. Data are presented as mean ± standard deviation (SD). ∗ P < 0.05, compared with the control group. ND: normal diet; i.p.: intraperitoneal; H&E: hematoxylin and eosin.
Article Snippet: The slides were incubated with antibodies against caveolin-1 (Cav-1) (Sangon Biotech Co., Ltd.), proliferation marker protein Ki-67 (Abcam, Cambridge, UK), nicotinamide adenine dinucleotide phosphate (NAD(P)H): quinone oxidoreductase 1 (NQO1) (Sangon Biotech Co., Ltd.), and Parkin (Cell Signaling Technology, Danvers, MA, USA) at RT for 2 h. Afterward, they were incubated with secondary antibodies (Invitrogen, Carlsbad, CA, USA) at RT for 2 h. The samples were thereafter reacted with a 3,3′-diaminobenzidine (DAB) solution (Beijing Zsgb Bio, Beijing, China) to visualize signals, followed by counterstaining with hematoxylin.
Techniques: Ubiquitin Proteomics, Knock-Out, Injection, Ointment, Immunohistochemistry, Marker, Standard Deviation, Control