From in vitro research to real life studies: an extensive narrative review of the effects of balneotherapy on human immune response
Key Findings
- Reviews effects of balneotherapy on human immune response from in-vitro to clinical
- Documents immunomodulatory effects including T-cell and cytokine modulation
- Bridges the gap between laboratory evidence and real-world clinical outcomes
Narrative review published in Sport Sciences for Health (2021), tracing the immunological evidence for balneotherapy from cell culture experiments through to clinical observations. The explicit focus on the immune response fills a gap between mechanism reviews (what peloid compounds do in cell assays) and clinical reviews (what balneotherapy does to patients) by tracking immune markers through both levels.
From In Vitro to Clinical
The review’s structure follows the evidence chain: laboratory experiments on isolated immune cells establish what happens at the molecular level; clinical studies in patients document whether those molecular changes produce measurable immune shifts in real people. Both levels of evidence are needed — in vitro data shows mechanism, clinical data shows whether the mechanism operates at therapeutically relevant scale in a living system.
T-Cell and Cytokine Modulation
Balneotherapy shifts T-cell population ratios and cytokine profiles toward regulatory states. Specifically, studies document reductions in pro-inflammatory T-helper-1 (Th1) and Th17 activity, with relatively preserved or enhanced regulatory T-cell (Treg) function. At the cytokine level, TNF-α, IL-1β, and IL-6 decrease while IL-10 (anti-inflammatory) is maintained or increased. This profile is clinically meaningful: it resembles the target of biological drugs used in autoimmune conditions, achieved here without systemic immunosuppression.
The Anti-Inflammatory vs. Immunomodulatory Distinction
The review explicitly addresses this distinction. Anti-inflammatory means suppressing inflammation — broadly reducing immune activity. Immunomodulatory means rebalancing immune regulation — normalising an over-activated response while preserving functional immunity. Balneotherapy appears to act immunomodulatorily rather than immunosuppressively: patients do not show increased infection rates after treatment, which would be expected if the immune system were simply suppressed.