Overview
This video describes the technique of creating a zebrafish cardiomyopathy model with minimal variations among experimental groups and in the sample, we create zebrafish cardiomyopathy model using the drug doxorubicin.
Protocol
1. DOX Injection in Adult Fish
- Place a clean 100 mm Petri dish with a sponge inside it, under a dissection microscope, then adjust the focus. Cut the sponge to make a cavity of about 4 cm in length to hold a fish. Make a longer cavity for a larger fish.
- Prepare a 34 G needle with a 10 µL micro-syringe. Rinse the needle with 1x HBSS buffer to remove any bubbles and blocks from the syringe and tubing.
- Anesthetize the adult fish in embryo water containing 0.16 mg/mL tricaine for 2 min.
NOTE: Prolonged anesthetization over 5 min followed by DOX injection can easily cause fish death. - Soak the sponge in embryo water with tricaine, and transfer the fish onto the sponge for injection.
- Perform IP DOX injection by either of the two methods described below.
- Classic IP injection
- Position the fish with the abdomen up in the cavity of the sponge. Quickly insert the needle, with a 45° angle to the fish body into the midline between the pelvic fins, and penetrate approximately 1-2 mm. Release all DOX solution slowly. Wait 5 s before pulling out the needle. Check the DOX delivery by a visible red color in the fish belly.
- Alternative IP injection
- Place the fish laterally onto the sponge with the anterior to the right. Gently stabilize the fish using a blunt end forceps with the left hand, and hold the micro-syringe with the right hand.
- Position the needle below the lateral line above the pelvic fin, with the bevel facing up. Pointing at the 7 o'clock position at a 45° angle, insert the needle 3-4 mm to the fish cavity located between the pelvic and the anal fins, and then slowly depress the plunger. Check the DOX delivery by a visible red color in the fish belly.
- Classic IP injection
- Quickly transfer the injected fish to a clean crossing tank filled with fresh system water to allow the fish to recover. Rinse the needle once with 1x HBSS buffer between injections.
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Materials
Name | Company | Catalog Number | Comments |
Crossing tank | Aquaneering | ZHCT100 | Fish breeding |
Doxorubicin hydrochloride | Sigma | D1515-10MG | |
Hank's balanced salt solution (HBBS) | ThermoFisher | 14025076 | Vehicle for DOX |
100 mm petri dish | Falcon | 431741 | |
10 μL NanoFil micro-syringe | WPI | NANOFIL | For injection |
34 gauge needle | WPI | NF34BV-2 | For injection |
Tricaine | Argent | Anesthetizing fish |