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Endotoxin-inactivating activity in normal and pathological human blood samples.

T Obayashi, H Tamura, S Tanaka

Infection and Immunity

|August 1, 1986

Summary

Plasma endotoxin-inactivating activity significantly decreases during endotoxemia. A refined chromogenic test accurately distinguishes endotoxemia from other conditions, aiding in sepsis diagnosis.

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(1-->3)-beta-D-glucan determination in rat organs with limulus coagulation factor G.

Research in experimental medicine. Zeitschrift fur die gesamte experimentelle Medizin einschliesslich experimenteller Chirurgie·1997

Area of Science:

Biochemistry
Immunology
Microbiology

Background:

Endotoxemia, a serious condition, involves endotoxin presence in the blood.
Existing diagnostic methods may struggle to differentiate endotoxemia from other infections or contaminants.
Understanding endotoxin-inactivating factors is crucial for effective sepsis management.

Purpose of the Study:

To develop and validate a specific chromogenic test for endotoxin-inactivating activity.
To investigate the impact of endotoxemia, fungemia, and dialysis on this activity.
To differentiate endotoxemia from fungemia and non-endotoxic Limulus-reactive materials.

Main Methods:

Utilized an endotoxin-specific chromogenic test.
Fractionated amebocyte lysate to isolate factors of the horseshoe crab's endotoxin-sensitive coagulation pathway.

Related Experiment Videos

Assessed plasma endotoxin-inactivating activity in various conditions, including endotoxemia and fungemia.

Correlated plasma endotoxin concentration with inactivating activity.

Main Results:

Plasma endotoxin-inactivating activity was markedly diminished in endotoxemia.
Activity was not significantly affected by fungemia or cellulose membrane dialysis.
A strong negative correlation existed between plasma endotoxin concentration and inactivating activity.
The refined test successfully differentiated endotoxemia from fungemia and other Limulus-reactive materials.

Conclusions:

The developed chromogenic test is specific for endotoxin-inactivating activity.
Endotoxin-inactivating factors are consumed during endotoxemia, but not by fungal polysaccharides or other non-endotoxic materials.
This assay offers a valuable tool for distinguishing endotoxemia, improving sepsis diagnosis and management.