Abstract

PEREZ GUERRA, Yohani et al. Effect in vitro of D-003 on 5-lipooxygenase (5-LOX) enzyme activity. Rev Cubana Farm [online]. 2013, vol.47, n.3, pp.400-407. ISSN 0034-7515.

Introduction: D-003, a mix of higher primary aliphatic acids purified from sugarcane, inhibits cholesterol synthesis. Recent studies have demonstrated that D-003 is effective in experimental models of osteoarthritis and inhibits the enzymatic activities of COX1 and COX2, mainly that of COX1, without causing gastrotoxicity. It has been mentioned that the dual inhibitors of COX and 5-LOX enzymes present with anti-inflammatory effects and no gastrotoxicity or even they can have gastroprotective actions. According to this background, D-003 could be a dual inhibitor of COX and 5-LOX enzymes. Objective: to study the effects of D-003 on the enzymatic activity of 5-LOX in vitro, by using the cytosolic fraction of polymorphonuclear leukocytes of rats. Methods: the following testing conditions were used: cytosolic fraction (50 µg of protein) dissolved into 0,2 mol/L borate buffer solution (pH 9) and linoleic acid (7,8-250 mmol/L) as substrate. Parallel samples were incubated with Tween-20/H₂O (2 %) only (vehicle), D-003 (0,6-6 000 µg/mL) or green-lipped mussel (Perna canaliculus) extract (50 µg/mL) (reference substance). The enzymatic activity, evaluated by the conjugated diene formation, was assessed by the absorbance changes at 234 nm (5-LOX) measured in a UV-visible spectrophotometer. Results: by adding D-003, produced a dose dependent (r= 0,975; p< 0,05) (IC50= 23,06 µg/mL) in vitro inhibition of 5-LOX enzyme activity. The size of the inhibition was moderate, since the maximal inhibition, achieved from 1 250 µg/mL) on was only 30 %. Conclusions: this study demonstrates that D-003 may inhibit in vitro the 5-LOX enzymatic activity, but in a moderate way.

Keywords : higher primary aliphatic acids; D-003; 5-LOX inhibition; lipooxygenases.

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