Procedure for Decellularization of Rat Livers in an Oscillating-pressure Perfusion Device

The overall goal of the following experiment is to evaluate the role of the perfusion root in optimizing the homogeneity of rat liver perfusion decellularization. This is achieved by first cannulating, the portal veins and hepatic arteries of freshly isolated rat livers. As a second step, the livers are connected to a perfusion device for selective perfusion of the portal veins or the hepatic arteries.

Next, oscillating pressure changes are applied to the perfusion chamber to mimic the intraabdominal pressure changes that occur during respiration. Optimizing the liver micro perfusion, ultimately livers perfused via the hepatic artery under oscillating pressure conditions exhibit A more homogenous and quicker decellularization as assessed by macroscopic observation and histological and biochemical analysis. The main advantage of this technique over existing methods like portal venous perfusion decellularization is that arterial perfusion using oscillating pressure conditions leads to a more homogeneous decellularization result.

In a shorter time, Though, this method can provide insight into deceleration techniques. It can also be applied to other systems such as res solarization experiments, extraoral perfusion setups, and organ models. Generally, individuals new to this method will struggle because the harvesting and arterial cannulation of red livers can be complicated.

Before harvesting the liver, make an oblique cut to the end of a 1.5 centimeter piece of a peripheral G 20 venous catheter. Connect the catheter to a three-way stop cock and use a 10 milliliter syringe filled with ringer solution to de air the system. Next, cut the needle of a butterfly cannula to a length of five millimeters and use super glue to fix a five centimeter tube to the needle.

Insert a two centimeter long tube into the bigger tube, and fix this tube with super glue as well. Slip another tube over this construction and glue it into place to create an abutment. Then use a five milliliter syringe filled with ringer solution to de the newly constructed arterial cannula To repair the liver for harvest.

Begin by using wet cause bandage to hold the medial and left liver lobes of an anesthetized adult rat cran under the dome of the diaphragm. Expose the hepato duodenal ligament and the upper liver lobe at this time as well. Next, use two micro forceps and spring scissors to carefully dissect the ligament attached to the upper omental lobe until the lobe is mobile.

Then holding the medial and left lobes in place. Use wet cotton swabs to move the lobe under the GRE's compress and the stomach to the left of the animal. Fix the stomach with a clamp and dissect the minor momentum.

Then dissect the lower or mental liver lobe until it is mobile, and move the lobe back into its cavity using a backhouse clamp to retain the duodenum, move the duodenum to the left to expose the herpa duodenal ligament. Circumscribing the common bile duct. Then dissect the bile duct from the adipose and pancreatic tissue, cutting the duct 1.5 centimeters from the bile duct bifurcation.

Dissect the sal vein from the surrounding adipose tissue, exposing the gastroduodenal vein. Then ligate the gastroduodenal vein twice with six zero sutures and divide the vein between the two knots. Dissect the celiac trunk and the common hepatic artery from the surrounding tissue until all of the arterial ramia revealed.

After all of the arteries have been dissected, circumscribe the inferior caval vein between the right kidney and the right lateral liver lobe and dissect the vein from the retroperitoneal space. Follow the celiac trunk to expose the aorta. Then dissect the retroperitoneal adipose tissue and circumscribe the aorta above the celiac trunk.

Now inject 1000 units of heparin in one milliliter of saline into the inferior vena caver. Cover the incision with a cotton pad and wait one to two minutes for the heparin to take effect. Then circumscribe the aorta with forceps and dissect the aorta and the inferior vena caver distally from the kidney.

To place the portal venous cannula, make a fish mouth incision in the distal portal vein and open the incision with forceps. Then cannulate the portal vein and flush the liver with 20 milliliters of ringer solution until the liver dehumanizes Using silk six zero ligatures to fix the cannula in place. To place the arterial cannula, dissect the aorta above the celiac trunk until the aorta segment can be liberated from the retroperitoneal space.

Cut the aorta segment longitudinally to generate an aortic patch and insert the self-built cannula into a static holder. Then use two forceps to slip the aortic patch over the cannula and ligate the hepatic artery with a silk six zero suture over the cannula. Fixing the patch at the abutment to perform the decellularization Link the three-way stopcock on the portal vein cannula to the related reactor access and connect the arterial cannula to the arterial access taking care that no air enters the systems.

Next, connect the respirator to the pressure distribution chamber and connect the chamber to the reactor. Start the pressure application. Then to start the decellularization.

Fuse the liver with 1%tritton X 100 at a rate of five milliliters per minute. Allow the waste effluence via the outflow of the perfusion device to keep the fluid level inside the perfusion chamber constant and above the perfused liver. After 90 minutes, change the detergent to 1%SDS livers perfused via the force vein exhibit in homogenous elucidation indicating decellularization with macroscopically visible remaining cells during and after the process, while livers perfused via the hepatic artery, demonstrate a more homogenous decellularization course with less visible remaining cells.

If the livers were perfused with the application of oscillating pressure conditions, no remaining cells were visible. Irrespective of the perfusion. Root histological evaluation of the decellularized liver matrices supports the macroscopic findings indeed in livers perfused via the hepatic artery.

No remaining cells, whether they were perfused under oscillating pressure conditions or not, are observed livers perfused via the portal Vein, however, exhibit zones of remaining cells, even if they are perfused under oscillating pressure conditions, although these conditions reduce the remaining cell mass in these livers, note, the preservation of the extracellular matrices of the livers regardless of the decellularization conditions. The DNA content per dry weight of the liver matrix also declined in all of the experimental groups compared with native livers. Although the differences were only statistically significant in the group's perfused under oscillating pressure conditions.

In addition, corrosion casting of the decellularized liver matrices confirmed the preservation of the microanatomy of the liver during the perfusion process. After watching this video, you should have a good understanding of how to harvest cannulate and perfuse red livers for reproducible homogeneous deceleration. Don't forget that working with Triton X 100 and SDS can be extremely hazardous, and precautions such as wearing gloves should also be taken by performing this procedure.