Bacterial Prostatitis Enhances 2-Amino-1-Methyl-6-Phenylimidazo[4,5-b]Pyridine (PhIP)-Induced Cancer at Multiple...

Area of Science:

• Oncology
• Microbiology
• Toxicology

Background:

• Prostate cancer is linked to dietary carcinogens (e.g., PhIP) and chronic inflammation.
• Bacterial prostatitis is a potential contributing factor to prostate cancer etiology.

Purpose of the Study:

• To investigate if bacterial prostatitis accelerates PhIP-induced preinvasive lesions in rat prostates.
• To determine the synergistic effects of PhIP and E. coli infection on prostate tumorigenesis.

Main Methods:

• Male Fischer 344 rats were divided into four groups: Control, PhIP, E. coli, or PhIP + E. coli.
• Animals were monitored for 52 weeks, with interventions including dietary PhIP and prostatic E. coli inoculation.
• Tumor burden, survival rates, lesion development, Ki-67 index, and serum cytokine levels (IL6, IL12) were assessed.

Main Results:

• PhIP + E. coli treatment significantly decreased survival due to increased invasive cancers at multiple sites.
• Animals treated with PhIP + E. coli showed more precancerous prostate lesions and a higher Ki-67 index compared to PhIP alone.
• Elevated serum IL6 levels in PhIP + E. coli-treated rats correlated with precancerous lesion development.

Conclusions:

• Bacterial prostatitis and dietary carcinogens may synergistically promote prostate tumorigenesis.
• Combined exposure to E. coli infection and PhIP carcinogen increases precancerous lesions and invasive cancers.
• Elevated IL6 may be a biomarker linking inflammation and prostate cancer progression.