Clearance of multiple antibiotic-resistant coagulase-negative staphylococci is selectively associated with higher circulating α-melanocyte stimulating hormone in patients evaluated for chronic inflammatory response syndrome.
Level 3 - non-randomized controlled study
Retrospective observational longitudinal cohort study evaluating biomarker changes across two timepoints.
PubMed 42077435 · doi:10.3389/fendo.2026.1728408
What was done
Retrospective observational cohort study of 188 adult patients evaluated for chronic inflammatory response syndrome (CIRS) at a single clinical site. Each participant had data across two timepoints for sinonasal culture status of multiple antibiotic-resistant coagulase-negative staphylococci (MARCoNS) and circulating levels of α-melanocyte stimulating hormone (α-MSH), matrix metallopeptidase-9 (MMP-9), and vasoactive intestinal polypeptide (VIP). Longitudinal biomarker changes were evaluated using mixed-effects modeling.
What was found
Across the total cohort, α-MSH increased by an estimated 10 pg/mL, MMP-9 decreased by 398 ng/mL, and VIP increased by 20 pg/mL between baseline and follow-up. Mixed-effects modeling identified a significant timepoint-by-MARCoNS interaction for α-MSH, showing that patients who achieved negative MARCoNS cultures at follow-up had higher circulating α-MSH concentrations than those who remained culture-positive. No significant interaction with MARCoNS status was observed for MMP-9 or VIP. Exact p-values and confidence intervals were not reported in the abstract.
Why it matters
Provides quantitative longitudinal evidence linking the clearance of sinonasal MARCoNS colonization to rising systemic α-MSH levels in patients evaluated for chronic multisystem illness.
Limits
Retrospective single-center design prevents causal inference. The abstract omits exact p-values, confidence intervals, treatment regimens received between timepoints, and the duration between baseline and follow-up. Additionally, the clinical definition of CIRS remains contested and non-standardized across broader medical practice.
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- context The peptide KPV is used as part of the Ritchie Shoemaker protocol to increase alpha-melanocyte-stimulating hormone (alpha-MSH) in cases of mold exposure and Chronic Inflammatory Response Syndrome (CIRS).