Serum pepsinogen I levels in relation to pepsinogen phenotypes

Area of Science:

• Biochemistry
• Gastroenterology
• Clinical Chemistry

Background:

• Pepsinogen I (PG I) is a key biomarker for gastric mucosal status.
• Understanding the relationship between PG I phenotypes and serum levels is crucial for diagnosing gastric conditions.
• Previous studies have explored PG I levels, but the association with specific phenotypes in patient cohorts requires further investigation.

Purpose of the Study:

• To investigate the relationship between serum PG I phenotypes and serum PG I levels.
• To determine if specific PG I phenotypes are associated with low serum PG I levels in patients undergoing gastroscopy.
• To explore potential links between PG I phenotypes and gastric pathologies like atrophic gastritis and gastric cancer.

Main Methods:

• Serum PG I levels were quantified using enzyme-linked immunosorbent assay (ELISA).
• Analysis included 567 blood donors (controls) and 171 patients from a routine gastroscopy program.
• PG I phenotypes were characterized and correlated with measured serum PG I levels.

Main Results:

• No association between PG I phenotypes and serum levels was observed in normal subjects.
• A significant association was found between low serum PG I levels and phenotypes characterized by intense PG I fraction 5 in patients.
• Mean serum PG I levels were 45.8 +/- 17.7 µg/L in controls, lower in females than males, and increased with age up to 65.

Conclusions:

• Specific PG I phenotypes, particularly those with intense PG I fraction 5, are associated with low serum PG I levels in patients.
• This association may reflect a higher prevalence of these phenotypes in individuals with atrophic gastritis or gastric cancer.
• Further research is warranted to confirm the diagnostic utility of PG I phenotypes in gastric disease screening.