Lungs Stop Clearing the Vasodilator Peptide Adrenomedullin During Late-Stage Sepsis
During late sepsis, the lungs' ability to clear adrenomedullin from blood is dramatically reduced, contributing to the dangerous blood pressure collapse seen in advanced septic shock.
Quick Facts
What This Study Found
Pulmonary clearance of adrenomedullin was significantly reduced during late-stage sepsis in rats, contributing to ADM accumulation and the hemodynamic collapse of septic shock.
Key Numbers
How They Did This
Animal study using a rat polymicrobial sepsis model. Adrenomedullin levels and pulmonary clearance were measured during early (hyperdynamic) and late (hypodynamic) phases of sepsis.
Why This Research Matters
Septic shock kills millions annually. Understanding that the lungs fail to clear vasodilatory peptides during late sepsis provides a new therapeutic target — restoring ADM clearance or blocking excess ADM could prevent fatal blood pressure collapse.
The Bigger Picture
Septic shock involves cascading organ failures. The finding that lung dysfunction contributes to peptide hormone accumulation reveals how organ failures compound each other — a failing lung can't clear vasodilatory peptides, worsening cardiovascular collapse.
What This Study Doesn't Tell Us
Rat sepsis model may not perfectly replicate human sepsis. The exact mechanism of reduced pulmonary clearance was not identified. Single peptide focus may miss interactions with other vasoactive mediators.
Questions This Raises
- ?Could ADM receptor antagonists help prevent late-sepsis hemodynamic collapse?
- ?Is reduced pulmonary peptide clearance a general phenomenon in organ failure?
- ?Can pulmonary ADM clearance be pharmacologically restored?
Trust & Context
- Key Stat:
- Clearance collapses Pulmonary adrenomedullin clearance drops dramatically in late sepsis, amplifying the vasodilatory peptide accumulation driving shock
- Evidence Grade:
- Preliminary animal evidence from a controlled sepsis model with clear hemodynamic and pharmacokinetic data.
- Study Age:
- Published in 1999. Adrenomedullin's role in sepsis has been confirmed, and MR-proADM is now used clinically as a sepsis biomarker.
- Original Title:
- Pulmonary clearance of adrenomedullin is reduced during the late stage of sepsis.
- Published In:
- Biochimica et biophysica acta, 1427(2), 315-21 (1999)
- Authors:
- Ornan, D A, Chaudry, I H(4), Wang, P(4)
- Database ID:
- RPEP-00549
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
What happens to blood pressure in sepsis?
Sepsis initially causes increased heart output (hyperdynamic phase), but progresses to dangerous blood pressure collapse (hypodynamic phase). Accumulation of vasodilatory peptides like adrenomedullin contributes to this collapse.
Why do the lungs matter in sepsis?
The lungs normally filter and clear vasoactive peptides from blood. When lung function fails in sepsis, these peptides accumulate, making blood pressure even harder to maintain — a cascade effect that worsens shock.
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Cite This Study
https://rethinkpeptides.com/research/RPEP-00549APA
Ornan, D A; Chaudry, I H; Wang, P. (1999). Pulmonary clearance of adrenomedullin is reduced during the late stage of sepsis.. Biochimica et biophysica acta, 1427(2), 315-21.
MLA
Ornan, D A, et al. "Pulmonary clearance of adrenomedullin is reduced during the late stage of sepsis.." Biochimica et biophysica acta, 1999.
RethinkPeptides
RethinkPeptides Research Database. "Pulmonary clearance of adrenomedullin is reduced during the ..." RPEP-00549. Retrieved from https://rethinkpeptides.com/research/ornan-1999-pulmonary-clearance-of-adrenomedullin
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkPeptides research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.