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Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation

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Published on: May 16, 2016

Changes in endotoxin sensitivity in ageing. Absorption, elimination and mortality.

M A Horan¹, A Brouwer, R J Barelds

¹Institute for Experimental Gerontology, TNO, Rijswijk, The Netherlands.

Mechanisms of Ageing and Development

|February 1, 1991

Summary

Aging significantly increases sensitivity to endotoxin toxicity in rats, leading to higher mortality rates and hypothermia. Aged rats showed slower endotoxin removal but this did not fully explain their increased vulnerability.

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Area of Science:

Gerontology
Toxicology
Immunology

Background:

Endotoxin exposure can lead to severe physiological responses.
The impact of aging on endotoxin sensitivity is not fully understood.

Purpose of the Study:

To investigate the influence of aging on the toxic effects of intravenously injected endotoxin in rats.

Main Methods:

Two rat strains were used, comparing young and aged animals.
51Cr-labelled endotoxin was administered intravenously.
Mortality, body temperature, and post-mortem findings were assessed.

Main Results:

Aging did not affect endotoxin absorption from the jejunum or colon.
Aged rats exhibited significantly higher mortality (nearly 100%) compared to young rats.
Dying aged animals developed profound hypothermia, liver (leukocyte infiltrates, hepatocellular necrosis), and kidney (acute tubular necrosis) damage.
Slower endotoxin clearance was observed in aged animals, but not sufficient to explain the enhanced toxicity.

Conclusions:

Aging enhances sensitivity to the lethal effects of endotoxin.
Hypothermia and specific organ damage are key features of endotoxin toxicity in aged rats.
While altered clearance plays a role, other age-related factors likely contribute to increased endotoxin vulnerability.