Fig. 5.
HAX-1 enhances the degradation of cyclophilin-D. (A) Cyp-D mRNA transcript, or ppif levels were similar in WT, HAX-OE, and HAX+/− hearts. n = 4 hearts for WT, and 5 hearts for each of the HAX-OE and HAX+/−. (B) Proteasomal inhibitor, Bortezomib, restored Cyp-D levels in HAX-1 overexpressing cells. Glyceraldehyde 3-phosphate dehydrogenase (GAPDH) was used as a loading control. n = 4 hearts for each group; *P < 0.05 vs. Ad.GFP. (C and D) Ubiquitination of Cyp-D was enhanced in HAX-OE hearts. Three independent experiments were performed. n = 4 hearts for each group. (E and F) Ubiquitination of Cyp-D was reduced in HAX+/− hearts. Three independent experiments were performed. n = 4 hearts for each group. Data are expressed as mean ± SEM.