Pasak bumi root (Eurycoma longifolia Jack) contains quasinoid. Quasinoid potentially hasàantitumor/anticancer,àanti-parasitic,àandàimmunostimulatoryàactivity.àTheàaimàofàthis research was to study the lymphocyte proliferationàactivity MTT-testààof ethanol extract ofàEurycomaàlongifoliaàJackàrootàonàinducedàbyà7,12-dimethylbenz[a]àantraceneà(DMBA) female Sprague Dawley rat. The test was done at 6 groups of 10àSD rat each. Each groups wasàadministeredàorallyàwithàDMBAà(GroupàI)àààdoseàofà20 mg/kgàbw,àcorn oilà(GroupàII), baseline (Group III), andàethanol extract of pasak bumi root dose 12.6; 25.2; and 50.4 mg/kg bw (Group IV,V,and VI). Ethanol extract is given for 5 weeks. At the second week five rats wereàsacrificedàtoàisolateàtheàlymphocytesàofàspleenàthenàratsàareàinjectedàorallyàwith DMBA 2 times a week for 5 weeks. At the eight until twenty fourth week all groups were justàadministeredàbyàaquades.àMeasurementàofàspleenàrelativeàweightàandàisolationàofàthe lymphocyteàspleenàwereàdoneàatàsecondàweekàandàtheàlastàofàexperiment.àLymphocyte proliferationàactivityàwereàmeasuredàbyàMTT-reductionàmethod.àDataàwereàanalyzed statisticallyàbyàanalyzesàofàvarianceà(anova)àcontinuedàbyàààààLSDàtestàandàKruskallàWallis continued by Mann Whitney test. The result showed that limphocyte proliferation activity MTT of ethanol extract of E. longifolia root doses of 12.6; 25.2; and 50.4 mg/kg bw for 14 days prior to DMBA-induced areà339.35 ñ 8.43;61.20 ñ 6.27;à310.28 ñà6.81ààandàdose 50,4 mg/kg bw afteràDMBA-induced is 122.108 ñà11.426
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