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Image Search Results
Journal: Circulation Research
Article Title: BAG3 and Hsc70 Interact With Actin Capping Protein CapZ to Maintain Myofibrillar Integrity Under Mechanical Stress
doi: 10.1161/circresaha.110.225649
Figure Lengend Snippet: Figure 5. Mechanical stress causes myofibrillar degeneration and contraction failure. A, Hematoxylin/eosin staining detects asymmetrical hypertrophy in bag3/ heart. The left 2 images show a low-magnification section of control (bag3/) heart, and the right 2 images depict bag3/ heart. The sagittal and trans- verse sections are displayed in the top and bottom images, respectively. Bar indicates 0.5 mm. B, Myofibrillar degeneration is induced by ex vivo contracture experiment. Papillary muscle fibers (0.4 mm in width and 2 mm in length) were dissected from left ventricles of wild-type, heterozygous, or bag3/ mice. One end of the fibers was tied with monofilament silk to a force transducer (AE801, SensoNor, Horton Norway) and the other to a micromanipula- tor to adjust the muscle length. The fibers were soaked in the high (124 mmol/L) K and low (30 mmol/L) Na solution to facilitate a large caffeine-induced contracture in cardiac muscle. After the sixth con- tracture, the papillary muscle fibers were removed and the myofibrillar ultrastructure was examined. Myofibrillar structure and Z-disc was disrupted in bag3/ papillary muscle after contracture (right) but not in control papillary muscle (left). C, Time course of repeated caffeine contractures in control cardiac muscle fibers. a, Caffeine (20 mmol/L) was repeatedly applied for 3 minutes in the high-K solution, each at 12-minute interval. b shows a rapid deterioration of the repeated caffeine-induced contractures in bag3/ cardiac muscle com- pared to control (bag3/, n4; control, n4). At the sixth contrac- ture, the amplitude was 50% of the original in the bag3/ mus- cle, whereas control muscle maintained 80% amplitude.
Article Snippet: The
Techniques: Staining, Control, Ex Vivo