in-vitro stability and aggregatory effect of ethanol extract leaves of Sida acuta Burm F. on human erythrocyte. -

O. B. Eze, O. Nwodo
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引用次数: 1

Abstract

Abstract Aim: This study aims to evaluate the membrane stability, Phospholipase A2 activity, prostaglandin synthase activity and aggregatory effect of ethanol leaves extract of Sida acuta Burm F. using an in-vitro heamolytic assay. Materials and methods: Two milliliters of blood collected from a healthy volunteer who has not taken drugs for last two weeks and ethanol extracts leaves of Sida acuta were used in the assay. Results: Apparently there was platelet aggregation at all but there was no minimal aggregation to denote in samples 1 and 2. There was a decrease in the supernatants of sample 1 of hypotonicity-induced haemolysis of human red blood cells incubated in normal saline but there was a high increase in the supernatants of sample 2 incubated with hypotonic solution. Inclusion of the extract concentrations 2, 4 and 8 mg/ml in the incubation medium (hypotonic solution) in samples 3, 4 and 5 decreased in a concentration dependent fashion. The absorption of haemolysed human red blood cells in isotonic solution showed the OD of 540nm:630nm to 2.15 for methaemoglobin while the OD of 540nm:570nm was 0.97 for deoxyhaemoglobin. In hypotonic solution where haemoglobin was released, the ratio of 540nm:630nm was 4.41 and 540nm:570nm was 1.20. The inclusion of the extract concentrations 2, 4 and 8 mg/ml in samples 3, 4 and 5 caused the ratio to decreased from1.69, 1.58 and 0.41 for methaemoglobin and 1.08, 0.86 and 0.41 for deoxyhaemoglobin. There was a decrease in activity of phospholipase A2 in samples 3, 4, 5 and 9 with the extract concentrations 2, 6, 12 and 16 mg/ml respectively but no decrease was observed in samples 6,7, 8 and 10, though no human red blood cells was included in samples 6, 7, 8, 9 and 10. There was a significant reduction (p  0.05) in prostaglandin synthase activity in sample 4 with extract concentration 25 mg/ml but a non-significant decrease (p  0.05) was observed in samples 3 and 5. Conclusion: The extract showed a significant inhibition of in-vitro haemolysis and could have a potential therapeutic effect on disease processes causing destabilization of biological membranes.
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荆芥叶乙醇提取物体外稳定性及对人红细胞的聚集作用。-
摘要:目的:采用体外溶血实验考察荆芥乙醇叶提取物的膜稳定性、磷脂酶A2活性、前列腺素合成酶活性及聚集作用。材料与方法:采集健康志愿者2 ml未服药2周的血液和荆刺叶乙醇提取物。结果:明显有血小板聚集,但样品1和样品2没有最小的聚集。在生理盐水中培养的低渗诱导的人红细胞溶血样品1的上清液减少,而在低渗溶液中培养的样品2的上清液则大量增加。在样品3、4和5的培养培养基(低渗溶液)中包含浓度为2,4和8 mg/ml的提取物以浓度依赖的方式减少。对溶血人红细胞在等渗溶液中的吸收结果显示,高氧血红蛋白的OD值为540nm:630nm ~ 2.15,脱氧血红蛋白的OD值为540nm:570nm ~ 0.97。在释放血红蛋白的低渗溶液中,540nm:630nm的比值为4.41,540nm:570nm的比值为1.20。在样品3、4和5中加入浓度为2、4和8 mg/ml的提取物,使脱氧血红蛋白的比值从1.69、1.58和0.41降低,脱氧血红蛋白的比值从1.08、0.86和0.41降低。样品3、4、5和9的磷脂酶A2活性分别在2、6、12和16 mg/ml浓度下降低,样品6、7、8和10的酶A2活性没有降低,但样品6、7、8、9和10的酶A2活性没有降低。样品4在提取液浓度为25 mg/ml时,前列腺素合成酶活性显著降低(p≤0.05),样品3和样品5无显著降低(p≤0.05)。结论:该提取物对体外溶血有明显的抑制作用,可能对引起生物膜不稳定的疾病过程有潜在的治疗作用。
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