New study finds a connection between bacteria in the gut and anti-tumour immune responses in the liver. The bacteria in the gut may affect the liver's anti-tumor immune function, according to the study. The study findings have implications for understanding the mechanisms that lead to liver cancer and pave the way to treat them.
The study showed that bacteria found in the gut of mice affect the liver's anti-tumour immune function.
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‘If you treat mice with antibiotics and thereby deplete certain bacteria, you can change the composition of immune cells of the liver, affecting tumour growth in the liver.’
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"What we found using different tumour models is that if you treat mice with antibiotics and thereby deplete certain bacteria, you can change the composition of immune cells of the liver, affecting tumour growth in the liver," said lead author Tim Greten, from the Center for Cancer Research (CCR) at the National Cancer Institute (NCI), a part of the National Institutes of Health.
In humans, the greatest proportion of the body's total microbiome -- the collection of bacteria and other micro-organisms that live in or on the body -- is in the gut.
![Novel Protein that can Fight against Liver Cancer Identified]( "Novel Protein that can Fight against Liver Cancer Identified")
A new mechanism discovered can turn off the switch to prevent tumor growth in liver cancer. The protein called LHPP (Phospholysine Phosphohistidine Inorganic Pyrophosphate Phosphatase) prevents the spread of cancer.
Despite extensive research into the relationship between the gut microbiome and cancer, the role of gut bacteria in the formation of liver cancer has remained poorly understood.
For the study, published in the journal Science, the team carried out a series of experiments with mice. They used three mouse liver cancer models, and found that when they depleted gut bacteria using an antibiotic "cocktail," the mice that had the antibiotics developed fewer and smaller liver tumours and had reduced metastasis to the liver.
The investigators found that antibiotic treatment increased the numbers of a type of immune cell called NKT cells in the livers of the mice.
In all three mouse models, the reduction in liver tumour growth that resulted from antibiotic treatment was dependent on these NKT cells.
Further, they found that the accumulation of the NKT cells in the liver resulted from an increase in the expression of a protein called CXCL16 on cells that line the inside of capillaries in the liver.
As bile acids can control the expression of CXCL16, the team treated mice with bile acids. They changed the number of NKT cells in the liver, and thus the number of tumours in the liver.
Finally, they found that one bacterial species, Clostridium scindens, controlled metabolism of bile acids in the mouse gut and ultimately CXCL16 expression, NKT cell accumulation, and tumour growth in the liver.
They found that bile acids also controlled the expression of the CXCL16 protein in the liver of humans, suggesting that the novel mechanism described in the study may potentially apply to cancer patients.
Source: IANS
Novel Protein that can Fight against Liver Cancer Identified
A new mechanism discovered can turn off the switch to prevent tumor growth in liver cancer. The protein called LHPP (Phospholysine Phosphohistidine Inorganic Pyrophosphate Phosphatase) prevents the spread of cancer.
Advertisement
Despite extensive research into the relationship between the gut microbiome and cancer, the role of gut bacteria in the formation of liver cancer has remained poorly understood.
For the study, published in the journal Science, the team carried out a series of experiments with mice. They used three mouse liver cancer models, and found that when they depleted gut bacteria using an antibiotic "cocktail," the mice that had the antibiotics developed fewer and smaller liver tumours and had reduced metastasis to the liver.
The investigators found that antibiotic treatment increased the numbers of a type of immune cell called NKT cells in the livers of the mice.
In all three mouse models, the reduction in liver tumour growth that resulted from antibiotic treatment was dependent on these NKT cells.
Further, they found that the accumulation of the NKT cells in the liver resulted from an increase in the expression of a protein called CXCL16 on cells that line the inside of capillaries in the liver.
As bile acids can control the expression of CXCL16, the team treated mice with bile acids. They changed the number of NKT cells in the liver, and thus the number of tumours in the liver.
Finally, they found that one bacterial species, Clostridium scindens, controlled metabolism of bile acids in the mouse gut and ultimately CXCL16 expression, NKT cell accumulation, and tumour growth in the liver.
They found that bile acids also controlled the expression of the CXCL16 protein in the liver of humans, suggesting that the novel mechanism described in the study may potentially apply to cancer patients.
Source: IANS
Patient Outcomes from Alcohol-Related Liver Cancer are the Worst
Alcohol-related liver cancer patients are more likely to cause death when compared Normal liver cancer, finds a new study.
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 Hepatitis C Virus Screening Rates Low Despite Increase in Liver Cancer RatesHepatitis C virus screening rates remain low in the United States despite the steady increase of liver cancer incidence. | Advertisement
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