Bacterial Lipopolysaccharide Induces a Conduction Block in the Sciatic Nerves of Rats
Abstract:A single injection of Escherichia coli lipopolysaccharide (LPS; intraperitoneally [i.p.] and intravenously [i.v.]) reliably induces peripheral nerve disturbances in the hindlimbs of inbred Australian albino Wistar (AaW) rats. In the series of experiments presented here, we aimed to characterize this syndrome by examining electrophysiologic, immunologic, and immunochemical features. The LPS-induced neurologic sequelae in AaW rats were transient, at least partly reversible by drug treatment, and were not associated with any detectable neuropathologic findings by light microscopy. Neurologic sequelae were prevented by administration of dexamethasone and by pretreatment with the macrophage inhibitor gadolinium chloride, suggesting that they were caused by LPS-induced activation of peripheral macrophages. Sequelae were associated with early decreases in compound muscle-action potential amplitudes, indicating impaired functioning of either proximal sciatic nerve axons and/or neuromuscular synapses. Spinal somatosensory-evoked potential latencies also were increased, indicating impaired somatosensory function at the sciatic nerve, dorsal roots, spinal cord, and/or postsynaptic interneurons, although the precise location of impairment could not be delineated. Similarities between this syndrome and immune-mediated polyneuropathies in humans are discussed.
Document Type: Research Article
Affiliations: 1: Psychology Department, The University of New South Wales, Sydney, Australia, Medical Psychology Unit, Royal Prince Alfred Hospital, Camperdown, NSW 2050, Australia 2: Department of Microbiology and Immunology, The University of New South Wales, Sydney, Australia 3: Animal Breeding and Holding Unit, The University of New South Wales, Sydney, Australia 4: Psychology Department, The University of New South Wales, Sydney, Australia 5: Department of Medicine, University of Sydney, Sydney, New South Wales, Australia
Publication date: 1999-02-01
Comparative Medicine (CM), an international journal of comparative and experimental medicine, is the leading English-language publication in the field and is ranked by the Science Citation Index in the upper third of all scientific journals. The mission of CM is to disseminate high-quality, peer-reviewed information that expands biomedical knowledge and promotes human and animal health through the study of laboratory animal disease, animal models of disease, and basic biologic mechanisms related to disease in people and animals.
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