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Rivista di Medicina Interna
Indexed/Abstracted in: BIOSIS Previews, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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Panminerva Medica 1999 September;41(3):217-9
Nitrite plasma levels after an oral fat meal in normolipemic subjects
Ferlito S., Gallina M.
From the Chair of Semeiology and Medical Methodology University of Catania, Italy
Background. The authors, investigating the effects of an oral triglyceride-rich fatty load upon the endothelial function as regards the production of nitric oxide, performed the determination of plasma nitrites, which are stable, specific and irreversible end-products of nitric oxide.
Methods. The series consists of 13 metabolically normal female subjects (mean age 55±7 years); after an overnight fasting each subject undertook an oral fat load (butter 1 g/kg); a venous blood withdrawal was carried out before oral fat meal and after two and four hours. For each plasma sample total cholesterol, HDL-cholesterol and triglyceride plasma levels were determined by enzymatic methods; LDL-cholesterol was calculated by Friedwald’s formula; the nitrite plasma levels were obtained by the Gutman and Hollywood colorimetric method.
Results. Total cholesterol, HDL-cholesterol, LDL-cholesterol did not show significant changes after the oral fat load; triglycerides rose significantly (p<0.05) after 4 hours as compared to the basal value (226±12 vs 175±12 mg/dl, +30%). The nitrite plasma levels were almost unchanged before oral fat load and after 2 and 4 hours.
Conclusions. The results suggest that the acute biochemical stress consisting of increased triglyceride-rich very low density lipoproteins was not able to stimulate the endothelial production of nitric oxide.