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Hepatocyte Activation Markers - Definition & Significance

Hepatocyte activation markers are laboratory values that indicate activation or damage of liver cells and are used in the diagnosis of liver diseases.

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Things worth knowing about "Hepatocyte activation markers"

Hepatocyte activation markers are laboratory values that indicate activation or damage of liver cells and are used in the diagnosis of liver diseases.

What are hepatocyte activation markers?

Hepatocyte activation markers are biochemical parameters measured in the blood that provide information about the activation, damage, or inflammation of liver cells (hepatocytes). They play a central role in the diagnosis and monitoring of liver diseases. When liver cells are damaged or activated, they release specific enzymes and proteins into the bloodstream, which can be detected as markers.

Key hepatocyte activation markers

Transaminases (ALT and AST)

The most well-known hepatocyte activation markers are the transaminases:

ALT (alanine aminotransferase): This marker is highly specific to the liver. Elevated ALT levels indicate damage or inflammation of liver cells.
AST (aspartate aminotransferase): AST is less liver-specific, as it is also found in heart muscle and skeletal muscle cells, but together with ALT it is an important indicator of liver cell damage.

GGT (gamma-glutamyltransferase)

GGT is an enzyme that is particularly elevated in diseases of the bile ducts and with chronic alcohol consumption. It is considered a sensitive marker for liver or biliary tract pathology.

ALP (alkaline phosphatase)

Alkaline phosphatase (ALP) is an enzyme that can be elevated in biliary tract diseases and in conditions affecting the liver and bones.

Bilirubin

Bilirubin is a breakdown product of haemoglobin. Elevated bilirubin levels can indicate impaired liver function, cholestasis (bile congestion), or increased breakdown of red blood cells.

GLDH (glutamate dehydrogenase)

GLDH is a mitochondrial enzyme and a highly specific marker for severe liver cell damage, particularly in cases of toxic or hypoxic causes.

Causes of elevated hepatocyte activation markers

Elevated values of these markers can indicate various diseases and conditions, including:

Acute and chronic hepatitis (viral, autoimmune, toxic)
Alcoholic liver disease
Non-alcoholic fatty liver disease (NAFLD) and non-alcoholic steatohepatitis (NASH)
Liver cirrhosis
Cholestasis and biliary tract diseases
Liver tumours or liver metastases
Drug- or toxin-induced liver damage
Heart failure with hepatic congestion

Diagnosis and interpretation

The assessment of hepatocyte activation markers is always carried out in a clinical context. Individual elevated values are often insufficient for a diagnosis. The physician considers the overall picture from several laboratory values, imaging procedures (e.g., ultrasound, MRI), and the medical history of the patient. The temporal development of the values is also important: a sudden sharp increase indicates acute damage, while persistently slightly elevated values may indicate a chronic disease.

When to see a doctor?

Elevated liver values are often discovered incidentally during routine check-ups. The following symptoms may indicate liver disease and should be medically evaluated:

Yellowing of the skin or eyes (jaundice)
Persistent fatigue and exhaustion
Pressure or pain in the right upper abdomen
Dark urine or pale stools
Nausea and loss of appetite

Treatment

Treatment depends on the underlying cause. Antiviral medications are used for viral hepatitis. In alcohol- or drug-induced liver damage, discontinuation of the causative substance is the primary measure. For fatty liver disease, lifestyle changes such as weight reduction, a healthy diet, and regular physical activity are crucial.

References

Longo DL et al. - Harrison's Principles of Internal Medicine, 21st edition. McGraw-Hill, 2022.
European Association for the Study of the Liver (EASL) - EASL Clinical Practice Guidelines on non-invasive tests for evaluation of liver disease severity and prognosis (2021). Journal of Hepatology, 75(3), 659-689.
Kwo PY, Cohen SM, Lim JK - ACG Clinical Guideline: Evaluation of Abnormal Liver Chemistries. American Journal of Gastroenterology, 2017; 112(1): 18-35.

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