Journal: Journal of Orthopaedic Translation

Article Title: Targeting ANT1 to regulate PINK1/Parkin-mediated mitophagy is an effective treatment of trauma-induced tendon heterotopic ossification

doi: 10.1016/j.jot.2025.08.002

Figure Lengend Snippet: InTPCs have higher levels of PINK1/Parkin-mediated mitophagy and osteogenic differentiation than TSPCs . (A) Representative TEM images showing healthy mitochondria (white arrow) and mitophagy (red arrow) in the TSPC and inTPC groups when undifferentiated and when exposed to ODM for two days and two weeks, respectively. Scale bar = 1 μm (original magnification) and 200 nm (insert magnification of the boxed area). (B) Quantification of the number of mitochondria per TEM field. (C) Quantification of the number of APs and ALs per TEM field. (D) Representative JC-1 fluorescence images of TSPCs and inTPCs after two days of osteogenic induction (red: 561 nm/green: 488 nm). Scale bar = 100 μm. (E–G) Quantification of the JC-1 fluorescence intensity ratio. (H) Representative colocalization images of mitochondrial and lysosomes in TSPCs and inTPCs after two days of osteogenic induction (red: 594 nm/green: 488 nm). Scale bar = 10 μm (original magnification) and 2 μm (insert magnification of the boxed area). (I, J) Pixel matching colocalization analysis in TSPCs (I) and inTPCs (J). (K) Pearson's correlation and Overlap coefficient of colocalization. (L, M) qRT–PCR analysis of the mitophagy-related genes Pink1 , Prkn , LC3b , and p62 (L) and osteogenic-related genes Ocn , Runx2 , and Alpl (M) in TSPCs and inTPCs after two weeks of osteogenic induction. (N, O) Western blotting analysis (N) and quantification (O) of mitophagy-related proteins, PINK1, Parkin, LC3BⅡ, and p62 in TSPCs and inTPCs after two weeks of osteogenic induction. (P, Q) Western blotting analysis (P) and quantification (Q) of osteogenic-related proteins, OCN, RUNX2, and ALP in TSPCs and inTPCs after two weeks of osteogenic induction. (R) ALP staining of TSPCs and inTPCs under weeklong osteogenic induction. Scale bar = 200 μm. (S) Quantification of ALP staining. (T) ARS staining of TSPCs and inTPCs under two weeks of osteogenic induction. Scale bar = 200 μm. (U) Quantification of ARS staining. ∗ p < 0.05, ns, not significant.

Article Snippet: Mitochondria in cell samples were stained using the MitoMP Detection Kit (JC-1) (Dojindo, MT09, Japan) at 37 °C for 30 min.

Techniques: Fluorescence, Quantitative RT-PCR, Western Blot, Staining

Journal: Journal of Orthopaedic Translation

Article Title: Targeting ANT1 to regulate PINK1/Parkin-mediated mitophagy is an effective treatment of trauma-induced tendon heterotopic ossification

doi: 10.1016/j.jot.2025.08.002

Figure Lengend Snippet: Elamipretide inhibits PINK1/Parkin-mediated mitophagy and osteogenic differentiation of inTPCs . (A) Representative TEM images showing healthy mitochondria (white arrow) and mitophagy (red arrow) in inTPCs treated with vehicle or 1 μM elamipretide when exposed to ODM for two days and two weeks, respectively. Scale bar = 1 μm (original magnification) and 200 nm (insert magnification of the boxed area). (B) Quantification of the number of mitochondria per TEM field. (C) Quantification of the number of APs and ALs per TEM field. (D) Representative JC-1 fluorescence images of inTPCs treated with vehicle or 1 μM elamipretide after two days of osteogenic induction (red: 561 nm/green: 488 nm). Scale bar = 100 μm. (E–G) Quantification of the JC-1 fluorescence intensity ratio. (H) Representative colocalization images of mitochondria and lysosomes in inTPCs treated with vehicle or 1 μM elamipretide after two days of osteogenic induction (red: 594 nm/green: 488 nm). Scale bar = 10 μm (original magnification) and 2 μm (insert magnification of the boxed area). (I, J) Pixel matching colocalization analysis in inTPCs treated with vehicle (I) or 1 μM elamipretide (J). (K) Pearson's correlation and Overlap coefficient of colocalization. (L, M) qRT–PCR analysis of the mitophagy-related genes Pink1 , Prkn , LC3b , and p62 (L) and the osteogenic-related genes Ocn , Runx2 , and Alpl (M) in inTPCs treated with vehicle or 1 μM elamipretide after two weeks of osteogenic induction. (N, O) Western blotting analysis (N) and quantification (O) of mitophagy-related proteins PINK1, Parkin, LC3BⅡ, and p62 in inTPCs treated with vehicle or 1 μM elamipretide after two weeks of osteogenic induction. (P, Q) Western blotting analysis (P) and quantification (Q) of osteogenic-related proteins OCN, RUNX2, and ALP in inTPCs treated with vehicle or 1 μM elamipretide after two weeks of osteogenic induction. (R) ALP staining of inTPCs treated with vehicle or 1 μM elamipretide under weeklong osteogenic induction. Scale bar = 200 μm. (S) Quantification of ALP staining. (T) ARS staining of inTPCs treated with vehicle or 1 μM elamipretide under two weeks of osteogenic induction. Scale bar = 200 μm. (U) Quantification of ARS staining. ∗ p < 0.05, ns, not significant.

Article Snippet: Mitochondria in cell samples were stained using the MitoMP Detection Kit (JC-1) (Dojindo, MT09, Japan) at 37 °C for 30 min.

Techniques: Fluorescence, Quantitative RT-PCR, Western Blot, Staining