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[Carcinogenesis via microbial infection]

H Maeda¹

¹Dept. of Microbiology, Kumamoto University School of Medicine.

Gan to Kagaku Ryoho. Cancer & Chemotherapy

|September 2, 1998

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Chronic infections from pathogens like Helicobacter pylori and hepatitis viruses are major causes of cancer. Research indicates that free radicals generated during these infections are the likely mechanism driving carcinogenesis, necessitating a public health policy shift.

Area of Science:

Infectious Diseases
Carcinogenesis
Biochemistry

Background:

Infectious agents like Helicobacter pylori, Hepatitis B, and C viruses are linked to gastric cancer and hepatoma.
Parasites such as Opisthorchis viverrini and Schistosoma haematobium are associated with cholangiocarcinoma and urinary bladder cancer.
Chronic infections, often lasting over 15 years, are implicated in over 50% of Japanese cancers.

Purpose of the Study:

To explore the link between infectious diseases and cancer development.
To investigate the biochemical mechanisms underlying infection-induced carcinogenesis.
To propose a unifying theory for carcinogenesis involving free radicals.

Main Methods:

Review of extensive studies on infectious agents and associated cancers.

Related Experiment Videos

Biochemical analysis of free radical generation in chronic infections.

Examination of the mutagenic potential of reactive oxygen and nitrogen species on nucleic acids.

Main Results:

Identified specific infectious agents as primary causes of various cancers.
Demonstrated that chronic infections generate reactive free radicals (superoxide, nitric oxide, peroxynitrite, etc.).
Established that these free radicals can modify DNA/RNA, causing strand breaks and mutagenicity.

Conclusions:

Free radical generation is a unifying mechanism in carcinogenesis, particularly in infection-associated cancers.
A paradigm shift in cancer prevention strategies is required, focusing on managing chronic infections and oxidative stress.
Understanding the role of free radicals in carcinogenesis can inform new public health policies.