D. LINCOVÁ, D. MIŠEKOVÁ, E. KMONÍČKOVÁ, N. CANOVÁ, H. FARGHALI

Institute of Pharmacology, First Faculty of Medicine, Charles University, Prague, Czech Republic


Received October 10, 2001
Accepted January 10, 2002

Summary
The present investigation was directed to study the effect of in vitro or ex vivo NO donors, sodium nitroprusside and molsidomine, using isolated sliced adipose tissue or in the form of immobilized and perfused adipocytes on the basal and isoprenaline-stimulated lipolysis. The results demonstrated that 1) in vitro application of sodium nitroprusside to perfused adipocytes or molsidomine to sliced adipose tissues affects isoprenaline-induced lipolysis in two ways, an increase in lipolysis at low isoprenaline concentrations (which means the sensitization of adipose tissues to adrenergic effect by NO) and decreased adrenergic agonist-stimulated lipolysis at higher concentration of isoprenaline (a decrease in the maximum lipolytic effect of isoprenaline), 2) low concentrations of molsidomine alone induced lipolysis from adipose tissue which attained more than 60 % of that by isoprenaline (pD2 value for molsidomine = 11.2, while pD2 for isoprenaline = 8.17) while sodium nitroprusside did not affect the basal lipolysis significantly, 3) in vivo administration of molsidomine for 2 days reduced the maximum lipolytic effect of isoprenaline and (only non-significantly) increased the sensitivity to low doses of isoprenaline. In conclusion the present data demonstrate that NO plays an important role in adrenergic lipolysis in adipose tissues and further investigations are needed to unravel the exact role of NO in lipolysis. .

Key words
Adipose tissue · Lipid mobilization · Nitric oxide · Isoprenaline · Molsidomine · Sodium nitroprusside

Reprint requests
Doc. MUDr. Dagmar Lincová, CSc., Institute of Pharmacology, First Medical Faculty, Charles University, 128 00 Prague 2, Albertov 4, Czech Republic. E-mail: dlin@lf1.cuni.cz

ISSN 0862 - 8408