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Endotoxin Activity Assay for the Detection of Whole Blood Endotoxemia in Critically Ill Patients
Published on: June 24, 2019
EFFECTS OF BACTERIAL ENDOTOXINS ON METABOLISM : IV. RENAL FUNCTION AND ADRENOCORTICAL ACTIVITY AS FACTORS IN THE
1Department of Biology, Bryn Mawr College, Bryn Mawr.
The Journal of Experimental Medicine
|October 30, 2009
Summary
Endotoxin impairs adrenal gland function and renal excretion in mice, leading to elevated blood non-protein nitrogen, primarily urea. This suggests endotoxin interferes with the body's response to hormones like ACTH.
Area of Science:
- Endocrinology
- Toxicology
- Physiology
Background:
- Adrenal glands secrete glucocorticoids, influenced by ACTH and endotoxin.
- Endotoxin's effect on nitrogen metabolism and renal function is not fully understood.
Purpose of the Study:
- To investigate how endotoxin affects glucocorticoid synthesis and nitrogen excretion in mice.
- To elucidate the physiological mechanisms behind endotoxin-induced changes in nitrogen balance and renal function.
Main Methods:
- In vitro assessment of adrenal gland glucocorticoid secretion after ACTH or endotoxin exposure.
- Measurement of blood and urinary non-protein nitrogen (NPN) levels under various treatment conditions.
- Evaluation of renal function through blood clearance, phenol red excretion, and urea elimination tests.
Main Results:
- Endotoxin and ACTH suppressed in vitro glycocorticoid synthesis and depleted adrenal cholesterol.
- Endotoxin alone, or with ACTH, increased blood NPN (mainly urea) but not urinary nitrogen excretion.
- Endotoxin-poisoned mice exhibited impaired renal function, with reduced urea elimination and altered urea distribution between carcass and urine.
Conclusions:
- Endotoxin interferes with adrenal response to ACTH and impairs renal function, leading to nitrogen retention.
- Elevated blood urea nitrogen is a key indicator of endotoxin's metabolic disruption.
- Diuretics and hydergine did not mitigate endotoxin-induced renal dysfunction or nitrogen imbalance.
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