Laboratory Liver Organisms: A Promising Innovation in Regenerative Medicine
- TOKYO (AP) — Japanese researchers have successfully created functional liver organoids, miniature organs resembling human livers, from cryopreserved human liver cells.
- A team at Keio University School of Medicine generated millions of these functional hepatic organoids from cryopreserved adult human hepatocytes.
- While organoids aim to replicate the structure and function of human organs, creating faithful liver reproductions has been arduous due to the organ's complexity and high energy demands.
Lab-grown Liver Organoids Show Promise for Regeneration, Drug Testing
Table of Contents
- Lab-grown Liver Organoids Show Promise for Regeneration, Drug Testing
- Lab-Grown Liver Organoids: Your Key Questions Answered
- What are lab-grown liver organoids?
- What are the potential benefits of liver organoids?
- how are liver organoids created?
- What is the significance of oncostatin M in liver organoid development?
- What functions do the lab-grown liver organoids perform?
- What are the implications for liver regeneration?
- How can liver organoids aid in drug development?
- How do organoids compare to customary methods for drug testing?
- How are liver organoids used to model liver disease?
- What are the advantages of using organoids to model liver disease?
- What are the future directions for liver organoid research?
- Summary of Key Advantages of Liver Organoids
TOKYO (AP) — Japanese researchers have successfully created functional liver organoids, miniature organs resembling human livers, from cryopreserved human liver cells. The achievement holds potential for liver regeneration, drug advancement, and advanced disease modeling.
A team at Keio University School of Medicine generated millions of these functional hepatic organoids from cryopreserved adult human hepatocytes. Their work is considered a significant step forward in regenerative medicine for the liver.
Overcoming Challenges in Liver Organoid Creation
While organoids aim to replicate the structure and function of human organs, creating faithful liver reproductions has been arduous due to the organ’s complexity and high energy demands.
Under standard culture conditions, hepatocytes tend to lose their specific characteristics, transforming into less specialized cells. This limits their ability to maintain liver function to only one or two weeks.
Key Finding: Oncostatin M
Researchers found that treating cryopreserved human hepatocytes with oncostatin M, a protein involved in inflammation, led to a million-fold increase in organoid proliferation compared to previous methods.
These cellular structures continued to grow for three months and survived for up to six months without losing their ability to differentiate into mature cell types.
The team used hormones to regulate hepatocyte functions and induce complete differentiation. Following this protocol, the organoids began to exhibit major liver functions, including glucose production and the synthesis of urea, bile acids, cholesterol, and triglycerides.
Albumin secretion levels matched those of hepatocytes in the human body, surpassing previous results. Furthermore, the organoids developed networks of fine channels essential for transporting gallstones.
According to Hiroshi Sato, an expert in organoid development, the discovery of oncostatin M’s role is a major advancement. In a statement, Sato said, “We certainly know very few molecules that can trigger the growth and organization of stem cells in organs.This approach is completely new and could facilitate the development.”
Implications for Treatment and Drug Development
When transplanted into mice with compromised immune systems and liver dysfunction, the human hepatic organoids replaced the animals’ liver cells and restored liver function. This suggests potential for regenerating human livers, which are essential for transplants but prone to damage after removal.
Transforming frozen cells into functional organoids could restore their ability to multiply, offering a viable source for cell therapies.
While the mouse transplants were prosperous,Sato noted that thousands of millions of cells would be needed for a human liver.
The research also offers immediate benefits for developing drugs for liver disease.
Currently, the pharmaceutical industry relies on human hepatocytes harvested from donors, an expensive resource costing between 600 and 1,800 euros per vial. These cells also lack predictability in terms of stability and efficiency.
Liver organoids, with their uniform features and controlled replication, could replace human hepatocytes in preclinical trials to assess drug toxicity and effectiveness.
Organoids as Models for Liver Disease
Organoids have proven to be efficient experimental models for studying liver disease. During the research, they produced their own lipids, which disappeared after treatment with drugs for steatotic hepatic disease associated with metabolic dysfunction (metabolic steatohepatitis).
Unlike conventional models involving artificial lipid injection, this model more accurately reflects the disease’s pathophysiology.
The team also genetically engineered the organoids to replicate transcarbamylase deficiency (OTC deficiency), a rare genetic disorder affecting the urea cycle.
The authors believe this success validates the use of organoids for studying hepatic diseases and testing personalized therapies.
Researchers plan to improve the organoids’ ability to multiply and incorporate other types of liver cells to enhance their usefulness and scientific applicability in biomedical studies.
Lab-Grown Liver Organoids: Your Key Questions Answered
What are lab-grown liver organoids?
Lab-grown liver organoids are miniature, three-dimensional versions of human livers created in a laboratory setting. They are essentially tiny, functional replicas of the liver, developed from human liver cells.
What are the potential benefits of liver organoids?
The advancement of liver organoids holds significant promise across several areas:
Liver Regeneration: They could potentially be used to repair or replace damaged liver tissue.
Drug Development: They can be used to test the effectiveness and safety of new drugs.
Disease Modeling: They provide a platform for studying liver diseases in a more realistic and controlled environment.
how are liver organoids created?
Researchers, such as those at Keio University School of Medicine, create liver organoids from cryopreserved human liver cells (hepatocytes). these cells are grown under specific conditions to encourage them to self-organise and develop into structures that resemble the human liver. A key advancement has been the use of oncostatin M, a protein which significantly increases the proliferation of organoids.
What is the significance of oncostatin M in liver organoid development?
oncostatin M, a protein involved in inflammation, was found to dramatically increase the proliferation of liver organoids. Specifically, its use resulted in a million-fold increase in organoid growth compared to previous methods.This allowed the liver organoids to continue growing for three to six months while still maintaining their ability to differentiate into mature cell types.
What functions do the lab-grown liver organoids perform?
these organoids have proven to be capable of several key liver functions, including:
Glucose production
Urea synthesis
Production of bile acids, cholesterol, and triglycerides
Albumin secretion (comparable to human hepatocytes)
Formation of channels for transporting gallstones
What are the implications for liver regeneration?
Liver organoids have shown promise for liver regeneration. When transplanted into mice with liver dysfunction, the organoids successfully replaced the animals’ liver cells and restored liver function. This suggests that these organoids could potentially be used to regenerate human livers, especially for patients in need of a liver transplant.
How can liver organoids aid in drug development?
Liver organoids offer a significant advantage in drug development:
They can act as models to test the efficacy and toxicity of new drugs, replacing the need for human hepatocytes, which are expensive and variable.
These organoids provide a more uniform and controlled environment.
How do organoids compare to customary methods for drug testing?
Traditional methods of drug testing frequently enough rely on human hepatocytes harvested from donors. These cells, however, can be costly and unpredictable (between 600 and 1,800 euros per vial) regarding their stability and efficiency. Liver organoids offer a consistent and controlled alternative for preclinical drug testing.
How are liver organoids used to model liver disease?
These organoids effectively serve as models for studying liver diseases. During this research, the organoids produced their own lipids, mirroring a steatotic hepatic disease (metabolic steatohepatitis). The team also genetically engineered the organoids to replicate transcarbamylase deficiency (OTC deficiency), showing their potential for studying specific hepatic diseases.
What are the advantages of using organoids to model liver disease?
Organoids offer several advantages over traditional disease models:
More Accurate Depiction: They more accurately reflect the pathophysiology of diseases compared to methods like artificial lipid injection.
Personalized Therapies: They can be used to test personalized therapies for specific genetic disorders.
What are the future directions for liver organoid research?
Researchers are focused on improving the ability of organoids to multiply and incorporating other types of liver cells into the organoids to enhance their usefulness in biomedical studies.
Summary of Key Advantages of Liver Organoids
| Feature | Advantage |
|---|---|
| Source of Cells | Created from cryopreserved human liver cells, offering a readily available source. |
| Drug Testing Accuracy | The uniform features and controlled replication of liver organoids can replace human hepatocytes in preclinical trials to assess drug toxicity and effectiveness. |
| Disease Modeling | More realistic models for studying liver diseases like steatotic hepatic disease and OTC deficiency. |
| Potential for Regeneration | The successful replacement of animal liver cells and restoration of function, which can be used for regenerating human livers. |