Changes in the antioxidant defence and in selenium concentration in tissues of vanadium exposed rats.
Vanadium is an element whose role as a micronutrient for humans is not yet completely established, but which has been shown to possess hypoglycaemic properties in diabetes. In an earlier study, we showed that in STZ-diabetic rats, exposure to 1 mg V per day has no effect on glycaemia or on antioxidant status. When the exposure was raised to 3 mg V per day there was a hypoglycaemic effect, together with reduced Se in the tissues, which reduced antioxidant defences. The aim of the present study was to examine whether exposure to 1 mg V per day modifies Se nutritional status and/or antioxidant defences in healthy rats. Two groups of rats were examined: control and vanadium-treated. Vanadium, as bis(maltolato)oxovanadium(iv), was supplied in the drinking water. The experiment had a duration of five weeks. Selenium was measured in excreta, serum, skeletal muscle, kidneys, liver, heart, femur and adipose tissue. Number of red (RBC) and white (WBC) blood cells and haemoglobin (Hb) were determined in samples of whole blood. Glutathione peroxidase (GPx), glutathione transferase (GST), catalase (CAT) and NAD(P)H:quinine-oxidoreductase1 (NQO1) activity, and malondialdehyde (MDA) in the liver were evaluated. Treatment significantly reduced food intake, produced an anaemic state, and decreased Se absorption and Se content in serum, kidneys and the liver. GPx, GST and NQO1 activity were decreased in the liver, while MDA levels rose. We conclude that healthy rats are more sensitive than diabetic ones to the effects of V. This should be taken into account for populations that are particularly exposed to V for environmental reasons, and/or that consume V as a nutritional supplement.
Institute of Nutrition and Food Technology and Department of Physiology, Facultad de Farmacia, Campus Cartuja, University of Granada, E-18071 Granada, Spain.
Cristina
C
Sanchez-Gonzalez
Carmen
C
Bermudez-Peña
Cristina E
CE
Trenzado
Heidi
H
Goenaga-Infante
María
M
Montes-Bayon
Alfredo
A
Sanz-Medel
Juan
J
Llopis
D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D001772:Blood Cell Count; D001773:Blood Cells / Q000166:cytology / Q000187:drug effects; D001835:Body Weight / Q000187:drug effects; D002374:Catalase / Q000378:metabolism; D004435:Eating / Q000187:drug effects; D005979:Glutathione Peroxidase / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D007004:Hypoglycemic Agents / Q000494:pharmacology*; D008099:Liver / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism; D008297:Male; D008315:Malondialdehyde / Q000378:metabolism; D016660:NAD(P)H Dehydrogenase (Quinone) / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D012643:Selenium / Q000032:analysis / Q000097:blood / Q000378:metabolism*; D014131:Trace Elements / Q000494:pharmacology*; D014639:Vanadium / Q000494:pharmacology*
D000975:Antioxidants; D007004:Hypoglycemic Agents; D014131:Trace Elements; D014639:Vanadium; D008315:Malondialdehyde; D002374:Catalase; D005979:Glutathione Peroxidase; D016660:NAD(P)H Dehydrogenase (Quinone); C507703:NQO1 protein, rat; D005982:Glutathione Transferase; D012643:Selenium