最近的研究表明,海草在治疗炎症性疾病方面具有潜在的应用价值。五种海草(Zosteramuelleri,无齿形结节,圆珠,异叶紫菜,和来自大堡礁(QLD,澳大利亚)因此被收集,并对其初步抗氧化和抗炎活性进行了评价。从五种海草物种的丙酮提取物中经过1,1-二苯基-2-吡啶酰肼(DPPH)自由基清除抗氧化剂测定,Z.muelleri的提取物具有最高的活性(半最小抑制浓度(IC50)=138µg/mL),地上部分(IC50=119µg/mL)的抗氧化活性明显高于根(IC50≥500µg/mL)。细菌脂多糖(LPS)激活和LEGENDplex细胞因子分析的人外周血单核细胞(PBMC)测定显示,Z.muelleri的气提物显着降低了炎性细胞因子肿瘤坏死因子α(TNF-α)的水平,白细胞介素(IL)-1β,和IL-6增加了29%,74%,90%,分别,相对于LPS治疗组。因此,用甲醇(MeOH)和己烷馏分分馏空气萃取物,和通过HPLC纯化MeOH级分导致4-羟基苯甲酸(1)的分离,木犀草素(2),和芹菜素(3)作为其主要成分。这些化合物先前已显示可降低TNF-α的水平,IL-1β,和IL-6代表Z.muelleri地上部分的一些主要生物活性成分。这项研究代表了对Z.muelleri的抗氧化和抗炎特性的首次研究,以及从该物种中首次分离出的小分子。这些结果突出了使用海草治疗炎症的潜力和进一步研究的需要。
Recent studies have shown that seagrasses could possess potential applications in the treatment of inflammatory disorders. Five
seagrass species (Zostera muelleri, Halodule uninervis, Cymodocea rotundata, Syringodium isoetifolium, and Thalassia hemprichii) from the Great Barrier Reef (QLD, Australia) were thus collected, and their preliminary antioxidant and anti-inflammatory activities were evaluated. From the acetone extracts of five
seagrass species subjected to 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging antioxidant assay, the extract of Z. muelleri had the highest activity (half minimal concentration of inhibition (IC50) = 138 µg/mL), with the aerial parts (IC50 = 119 µg/mL) possessing significantly higher antioxidant activity than the roots (IC50 ≥ 500 µg/mL). A human peripheral blood mononuclear cells (PBMCs) assay with bacterial lipopolysaccharide (LPS) activation and LEGENDplex cytokine analysis showed that the aerial extract of Z. muelleri significantly reduced the levels of inflammatory cytokines tumour necrosis factor alpha (TNF-α), interleukin (IL)-1β, and IL-6 by 29%, 74%, and 90%, respectively, relative to the LPS treatment group. The aerial extract was thus fractionated with methanol (MeOH) and hexane fraction, and purification of the MeOH fraction by HPLC led to the isolation of 4-hydroxybenzoic acid (1), luteolin (2), and apigenin (3) as its major constituents. These compounds have been previously shown to reduce levels of TNF-α, IL-1β, and IL-6 and represent some of the major bioactive components of Z. muelleri aerial parts. This investigation represents the first study of the antioxidant and anti-inflammatory properties of Z. muelleri and the first isolation of small molecules from this species. These results highlight the potential for using seagrasses in treating inflammation and the need for further investigation.