Letter to the Editor: Rethinking Helicobacter pylori-associated gastroduodenal disease through a systemic immune lens

Abstract

For decades, Helicobacter pylori (H. pylori)-associated gastric diseases have been interpreted through a largely compartmentalized immunological lens, in which local mucosal inflammation is viewed as the primary driver of pathology and systemic immune responses are relegated to secondary or epiphenomenal roles. This framework, while useful, struggles to explain the remarkable heterogeneity of gastric outcomes arising from anatomically localized infection. Emerging human data increasingly suggest that gastric pathology may be embedded within broader systemic immune configurations, raising the possibility that circulating immune responses actively interact with local gastric processes rather than merely reflecting them. Within this context, recent work examining systemic cytokine dynamics before and after H. pylori eradication offers timely and provocative insights. The study by de Melo et al in the World Journal of Gastrointestinal Endoscopy demonstrates that gastritis and duodenal ulcer are associated with distinct systemic cytokine signatures and that bacterial eradication induces phenotype-specific immune recalibration rather than uniform immunological resolution. These findings challenge reductionist interpretations of gastric disease and support an integrated mucosal-systemic immune axis as a conceptual framework for understanding divergent gastric phenotypes. By reframing H. pylori-associated disease in this way, the study invites critical reassessment of long-standing assumptions regarding immune hierarchy and causality in gastric pathology. Recognizing systemic immunity as an active participant rather than a passive bystander may influence how immunological data are interpreted and how future studies are designed.

Keywords: Helicobacter pylori; Systemic immunity; Immune imprinting; Gastritis; Duodenal ulcer; Cytokine signatures

Core Tip: Emerging evidence suggests that Helicobacter pylori-associated gastroduodenal diseases are shaped not only by local mucosal inflammation but also by stable, phenotype-specific systemic immune states. Recent findings indicate that bacterial eradication induces distinct systemic immune recalibration in gastritis and duodenal ulcer, particularly involving regulatory pathways such as interleukin-10 signaling. Recognizing this systemic immune dimension may refine the interpretation of immunological data and inform future research beyond a purely gastric framework.