Name: セミナーシリーズ】免疫応答を標的とした慢性肝疾患の治療、導入 ([Seminar Series] Treatment of chronic liver disease targeting immune responses, introduction)
Uploaded: 2021-01-14T06:32:33.000Z
Duration: 8 min 23 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

Hello, everyone. My name is Oh, Jae-Hoon, a PhD student of Department of Bio and Brain Engineering.

Today topic is that immune cell therapy for liver disease.

Before a professor’s lecture, I will introduce some basic information of liver and liver disease.

Liver is the largest organ of the body. Liver is a reddish brown organ with four lobes of

unequal size and shape. It is located in the right side of the abdominal cavity under the diaphragm.

Liver plays an important role in synthesis of proteins such as albumin, clotting factors and complements.

Liver is involved in detoxification and storage. In addition, it participates in the metabolism

of lipids and carbohydrates. The liver is the only human organ regenerating lost tissue.

25% of a liver can regenerate into a whole liver.

The liver gets dual blood supply from the hepatic arteries and hepatic portal vein.

The liver is composed of hepatocyte, kuppfer cell, sinusoidal endothelial cell, hepatic stellate cell,and so on.

80% of the liver volume is occupied by hepatocytes.

Hepatocytes play a vital role of hepatic function. Sinusoidal endothelial cells make sinusoidal

blood vessel which serve as a way for the oxygen-rich blood from the hepatic artery

and the nutrient-rich blood from the portal vein. Kupffer cells are located in the wall of sinusoids.

They act as macrophages. Hepatic stellate cells are found in the space between

the sinusoids and hepatocytes. In normal liver, the function and role of hepatic stellate

cells is unclear. Recent evidence suggests a role as an antigen-presenting cell.

When the liver is damaged, stellate cells can secrets extracellular matrix (collagen).

There are many kinds of liver disease. The most widely spread liver diseases are fatty liver,

hepatitis, cirrhosis and liver cancer. Fatty liver is a condition that fat accumulate in liver cells.

Microscope shows the large vacuoles of fat in liver tissue.

Hepatitis is an inflammatory disease of the liver. Inflammation is caused by viruses,alcohol, toxin and so on.

Cirrhosis is chronic liver disease characterized by replacement

of healthy liver tissue by fibrosis, scar tissue. Liver cancers are malignant tumors

that grow on the surface or inside the liver. The most frequent liver cancer is hepatocellular carcinoma.

It accounts for 75% of all liver cancers, Another type of cancer formed by

liver cells is hepatoblastoma, which is formed by immature liver cells. It is a rare malignant

I’ll explain cirrhosis in more details. Cirrhosis is mostly caused by alcoholism,

hepatitis virus, autoimmune, drug, and fatty liver which induce liver injury.

In response to liver injury, extracellular matrix or scar is accumulated. This process is called fibrosis.

Accumulation of extracellular matrix is considered as wound healing process.

However If liver is damaged by long-term injury, scar tissue by fibrosis replaces healthy tissue.

Over time this process results in cirrhosis of the liver. Scar tissue of cirrhosis is

not able to do normal hepatic function. Once cirrhosis has developed, the serious complications

of liver disease may occur, including liver failure and liver cancer.

What is the cellular mechanism of fibrosis? Liver injury activates hepatic stellate cells

and Kuppfer cells. Stellate cell activation is a key pathogenic feature underlying liver

fibrosis and cirrhosis. Activated hepatic stellate cells produce a huge amount of extracellular

matrix (collagen fibers) and many cytokine mediators (transforming growth factor-beta,

interleukin-6 and monocyte chemoattractant protein-1). Interaction of hepatic stellate

cells and immune cells in liver is related in the progression of liver fibrosis.

Some immune cells ameliorate liver fibrosis.

What is the treatment for cirrhosis? Currently, cirrhosis can't be cured. 

However, it is possible to manage the symptoms and any complications, and slow its progression.

Because cirrhosis is irreversible, treatment aims to stop the disease from getting worse.

The treatment depends on the cause of cirrhosis. If cirrhosis is caused by viral hepatitis,

patients may be treated with anti-viral drugs. If the patients are heavy drinkers, they are

advised to stop drinking alcohol. If the patients are overweight, they are advised to lose weight.

If cirrhosis is very severe and the liver stops working, the only treatment option

There are many scientific efforts to develop new treatment methods for cirrhosis.

Professor Jeong Won il (KAIST) and Kim Ja Kyoung (Yonsei University college of medicine ) have developed

new and novel treatment for liver cirrhosis. They used immune cell therapy.

Autologous bone marrow cells were transplanted into the patients of cirrhosis.

Autologous bone marrow cells increase the production of cytokines which inhibited the hepatic stellate

cells from secreting collagens. In this clinical trial, the immune cell therapy was effective

to improve 70% of the cirrhosis patients.

Today speaker is Professor Jeong won ill, at KAIST Graduate School of Medical Science and Engineering.

Prof. Jeong will give us a lecture on immune cell therapy for liver disease.