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Lipopolysaccharide reduces sodium intake and sodium excretion in dehydrated rats.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	de Almeida, Roberto L. Constancio, Juliana Vendramini, Regina C. Fracasso, José F. Menani, José V. De Luca, Laurival A.
Description	Country affiliation: Brazil Author Affiliation: de Almeida RL ( Department of Physiology and Pathology, School of Dentistry, São Paulo State University - UNESP, Brazil.)
Abstract	The objective of this study was to find out if lipopolysaccharide (LPS) administered intraperitoneally affects sodium and water intake and renal excretion in dehydrated rats. LPS (0.3-5 mg/kg b.w.) inhibited 0.3M NaCl intake induced by subcutaneous injection of the diuretic furosemide (FURO, 10 mg/kg b.w.) combined with the angiotensin converting enzyme inhibitor, captopril (CAP, 5 mg/kg b.w.). Only the highest doses of LPS (2.5 and 5 mg/kg) inhibited water intake induced by FURO/CAP. LPS (0.6 mg/kg) reduced urinary volume and sodium excretion, but had no effect on mean arterial pressure or heart rate of rats treated with FURO/CAP. LPS (0.3-5.0 mg/kg) abolished intracellular thirst and reduced by 50% the urine sodium concentration of rats that received 2 ml of 2M NaCl by gavage. LPS (0.3-5.0 mg/kg) also reduced thirst in rats treated with FURO alone (10 mg/rat sc). The results suggest that LPS has a preferential, but not exclusive, inhibitory effect on sodium intake and on intracellular thirst. The inhibition of hydro-mineral intake and the antinatriuresis caused by LPS in dehydrated rats may contribute to the multiple effects of the endotoxin on fluid and electrolyte balance and be part of the strategy to cope with infections.
File Format	HTM / HTML
ISSN	00319384
Issue Number	2
Volume Number	102
e-ISSN	1873507X
Journal	Physiology & Behavior
Language	English
Publisher	Elsevier
Publisher Date	2011-02-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Blood Pressure Research Support, Non-u.s. Gov't Peptides Male Dehydration Blood Journal Article Lipopolysaccharides Discipline Physiology Diuretics Thirst Antidiuretic Agents Disease Models, Animal Appetite Urine Heart Rate Sodium Chloride Captopril Rats Drinking Pharmacology Angiotensin-converting Enzyme Inhibitors Administration & Dosage Metabolism Body Temperature Drug Effects Furosemide Saline Solution, Hypertonic Animals Analysis Of Variance Discipline Behavioral Neuroscience
Content Type	Text
Resource Type	Article
Subject	Experimental and Cognitive Psychology Behavioral Neuroscience

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