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Liver regeneration is the process by which the liver is able to replace damaged or lost liver tissue. The liver is the only visceral organ with the capacity to regenerate. [1] [2] The liver can regenerate after partial hepatectomy or injury due to hepatotoxic agents such as certain medications, toxins, or chemicals. [3]
Some tissues such as skin, the vas deferens, and large organs including the liver can regrow quite readily, while others have been thought to have little or no capacity for regeneration following an injury. Numerous tissues and organs have been induced to regenerate. Bladders have been 3D-printed in the lab since 1999.
The Kupffer cells of liver are phagocytic cells that help in the phagocytosis of dead blood cells and bacteria from the blood. [ 57 ] The liver is responsible for immunological effects – the mononuclear phagocyte system of the liver contains many immunologically active cells, acting as a 'sieve' for antigens carried to it via the portal system .
The risk of HCC recurrence after liver transplantation is less than 15%. [6] Macrovascular or extrahepatic spread (spread of the cancer to blood vessels or outside the liver, respectively) are contraindications to liver transplantation. [6] The risks of liver transplantation extend beyond risk of the procedure itself.
Functional cells may also need to be replaced after undergoing apoptosis, which is the programmed death of cells that occurs normally as part of an organism's development. [3] Labile cells continually regenerate by undergoing mitosis and are one of three types of cells that are involved in cell division, classified by their regenerative capacity.
A liver support system or diachysis is a type of therapeutic device to assist in performing the functions of the liver. Such systems focus either on removing the accumulating toxins (liver dialysis), or providing additional replacement of the metabolic functions of the liver through the inclusion of hepatocytes to the device (bioartificial liver device).
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Additionally, blastema cells probably undergo epigenetic alterations during limb regeneration. [10] Blastema cells can differentiate into any cell type with the exception of neurons. This means axons which are cut can be regrown by blastema cells, but if the soma of a neuron is damaged then a new neuron is unable to be created.