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Zullies Ikawati
Faculty of Pharmacy Universitas Gadjah Mada Yogyakarta
Medicine & Pharmacology

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DUAL EFFECTS OF FLAVONOID QUERCETIN ON RAT BASOPHILIC LEUKEMIA (RBL-2H3) CELLS : INHIBITS HISTAMINE RELEASE AND REDUCES CELL GROWTH Zullies Ikawati; Elizabeth Wallgard; Kazutaka Maeyama
Indonesian Journal of Pharmacy Vol 13 No 2, 2002
Publisher : Faculty of Pharmacy Universitas Gadjah Mada, Yogyakarta, Skip Utara, 55281, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (130.619 KB) | DOI: 10.14499/indonesianjpharm0iss0pp55-64

Abstract

The dual effects of the flavonoid quercetin on rat basophilic leukemia cells (RBL-2H3), tumor analog mast cells, was studied. Quercetin is known as an anti-inflammatory drug that inhibits mast cell secretion of histamine. This study aims to investigate the consequences of varying incubation times with quercetin on 2H3 cells to histamine release inhibitory action and the effects of long time incubation to the morphology of the cells. The effect of quercetin on histamine synthesis was also observed. The histamine release from the cells was inhibited by quercetin as expected, but the ability of secretion was rapidly recovered when quercetin was removed before challenging. Incubation up to 6 hours decreased the inhibitory action, but longer than 6 hours increased the inhibitory activity. In long time incubation, the cells exhibited cell damage, decreased cell growth, morphological changes, and detachment from the underlying surface in proportion with the concentration of quercetin. The instant and reversible inhibitory effects of quercetin appear to represent a first phase of actions, while reduced cell growth, elevated cell damage and morphological changes seem to be connected to a second phase. Consequently, quercetin could be considered as a compound that acts dually on RBL-2H3 cells.Key words : quercetin, histamine, RBL-2H3 cells
Effect of ethanol extract of Erythrina fusca Lour (cangkring) leaves on suppression of cyclooxygenase-2 expression in raji cell line Zullies Ikawati; Agung Endro Nugroho; Winda Werdhinindah
Indonesian Journal of Pharmacy Vol 17 No 2, 2006
Publisher : Faculty of Pharmacy Universitas Gadjah Mada, Yogyakarta, Skip Utara, 55281, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (205.798 KB) | DOI: 10.14499/indonesianjpharm0iss0pp85-90

Abstract

COX-2. COX-2 is expressed highly in inflammation and cancer cells. The effect of ethanol extract of Erythrina fusca Lour (cangkring) toward suppression of COX-2 expression in Raji cells was studied using immunocytochemistry method. This research showed that ethanol extract of E. fusca Lour leaves on concentration of 250,0; 125,0; dan 62,50 μg/mL was able to suppress the COX-2 expression significantly in comparison to control, with the inhibition of 70,19 ± 2,14 %; 44,69 ± 1,62 %; and 23,25 ± 2,21 %.Key words: COX-2 expression, anti-inflammation, anti cancer, Raji cells, ethanol extract of E. fusca leaves, immunocytochemistry
Co-Authors Agung Endro Nugroho Elizabeth Wallgard Kazutaka Maeyama Winda Werdhinindah