Adrenomedullin is locally upregulated in cardiac and vascular tissue during both early and late sepsis, with immunostaining localizing it to endothelial and smooth muscle cells, not just increased blood levels.
Local productionThe heart and aorta produce their own adrenomedullin during sepsis — elevated blood levels aren't just from distant sources
What the researchers found
Adrenomedullin was locally upregulated in cardiac and aortic endothelial and smooth muscle cells during both early (hyperdynamic) and late (hypodynamic) sepsis stages, establishing cardiovascular tissue as a primary source.
Why it matters
Knowing the cardiovascular system produces its own vasodilatory peptide during sepsis helps explain the hemodynamic changes and could identify targets for managing septic cardiovascular dysfunction.
How the study worked
Animal study in rat sepsis model. Adrenomedullin levels measured in cardiac and aortic tissue by radioimmunoassay. Cellular localization determined by immunohistochemistry during early and late sepsis.
What this study cannot tell us
Rat model. Tissue upregulation correlates with but doesn't prove contribution to hemodynamic changes. The functional consequence of local versus circulating ADM was not determined.
How to read the evidence
Preliminary animal evidence with clear immunohistochemical localization and tissue-level quantification during controlled sepsis stages.
When this study was published
Published in 1999. Adrenomedullin's cardiovascular role in sepsis has been confirmed, with ADM-targeted therapies now in clinical trials.
The bigger picture
The cardiovascular system doesn't just passively respond to sepsis — it actively produces vasodilatory peptides. This autocrine/paracrine response may be protective initially but contribute to circulatory failure as sepsis progresses.
Questions still open
- Does blocking local ADM production improve septic hemodynamics?
- Is cardiac ADM production protective or harmful in late sepsis?
- Can ADM levels in tissue predict sepsis severity?
Common questions
Why does the heart make adrenomedullin during infection?
Can this be targeted for sepsis treatment?
Read the original research
Adrenomedullin is upregulated in the heart and aorta during the early and late stages of sepsis.
Biochimica et biophysica acta, 1453(2), 273-83
Citation
Zhou, M; Chaudry, I H; Wang, P. (1999). Adrenomedullin is upregulated in the heart and aorta during the early and late stages of sepsis.. Biochimica et biophysica acta, 1453(2), 273-83.