Ramulus Cinnamomi extract attenuates neuroinflammatory responses via downregulating TLR4/MyD88 signaling pathway in BV2 cells

Ramulus Cinnamomi （RC）, a traditional Chinese herb, has been used to attenuate inflammatory responses. The purpose of this study was to investigate the effect of RC extract on lipopolysaccharide （LPS）-induced neuroinflammation in BV2 microglial cells and the underlying mechanisms involved. BV2 cells were incubated with normal medium （control group）, LPS, LPS plus 30 pg/mL RC extract, or LPS plus 100 pg/mL RC extract. The BV2 cell morphology was observed under an optical microscope and cell viability was detected by MTT assay. Nitric oxide level in BV2 cells was detected using Griess regents, and the levels of interleukin-6, interleukin-1 β, and tumor necrosis factor u in BV2 cells were determined by ELISA. The expression levels of cyclooxygenase-2, Toll-like receptor 4 and myeloid differentiation factor 88 proteins were detected by western blot assay. Compared with the LPS group, both 30 and 100 μg/mL RC extract had no significant effect on the viability of BV2 cells. The levels of nitric oxide, interleukin-6, interleukin-1β and tumor necrosis factor ct in BV2 cells were all significantly increased after LPS induction, and the levels were significantly reversed after treatment with 30 and 100 μg/mL RC extract. Furthermore, RC extract significantly inhibited the protein expression levels of cyclooxygenase-2, Toll-like receptor 4 and myeloid differentiation factor 88 in LPS-induced BV2 cells. Our findings suggest that RC extract alleviates neuroinflammation by downregulating the TLR4/MyD88 signaling pathway.

Mechanisms of Cinnamomi Ramulus for coronary heart disease treatment:prediction based on network pharmacology

Chinese medicine.However,little is known about the potential mechanism.Elucidating the effective components and mechanism based on network pharmacology was our purpose.Methods:Traditional Chinese Medicine Systems Pharmacology was screened to collect the possible active ingredients and their CAS and SMILES was searched in Pubchem,and the related potential targets were further predicted in Swiss Target Prediction database.Coronary heart disease molecular members were gained from GeenCards database,and the predicted targets of Cinnamomi Ramulus for coronary heart disease’s treatment were selected by Wayne diagram.As for mechanism analysis,String was used to construct the protein-protein interactions,and DAVID was used to conduct the GO and KEGG analysis.Results:Through GO and KEGG analysis,we found that cAMP signaling pathway,estrogen signaling pathway,calcium signaling pathway was related with coronary heart disease.Using network-based systems biology,we predicted that 10 active ingredients in Cinnamomi Ramulus have the treating effects with 78 potential targets.PIK3CG,MAPK8,BCL-2,BAX,PRKACA,CASP3,CALM1,CALM2,CALM3,NOS2,NOS3 were mainly involved in the treating effects of Cinnamomi Ramulus.Conclusion:Cinnamomi Ramulus may treat coronary heart disease through cAMP signaling pathway,estrogen signaling pathway,calcium signaling pathway.PIK3CG,MAPK8,BCL-2,BAX,PRKACA,CASP3,CALM1,CALM2,CALM3,NOS2,NOS3 were supposed to be considerable targets for treating coronary heart disease.

Quantification of seven phenylpropanoid compounds in Chinese Cinnamomi Cortex and Ramulus by HPLC

In the present study, we developed and validated a high-performance liquid chromatography method for the simultaneous determination of seven phenylpropanoid compounds （2-hydroxyl cinnamaldehyde, coumarin, cinnamyl alcohol, cinnamic acid, 2-methoxy cinnamic acid, cinnamaldehyde and 2-methoxy cinnamaldehyde） in Cinnamomi Cortex and Cinnamomi Ramulus. The levels of seven phenylpropanoid compounds in Cinnamomi Cortex and Cinnamomi Ramulus were compared using this method. A total of 48 samples （27 Cinnamomi Cortex and 21 Cinnamomi Ramulus） were purchased in China and analyzed. Quantities of seven phenylpropanoid compounds ranged from 17.5 to 61.6 mg/g in Cinnamomi Cortex and ranged from 9.91 to 23.4 mg/g in Ciunamomi Ramulus. The level of 2-methoxy cinnamic acid in the Cinnamomi Cortex samples was below the LOD, whereas it ranged from 0 to 0.119 mg/g in the Cinnamomi Ramulus samples. The （cinnamyl alcohol＋cinnamic acid）/cinnamaldehyde ratios （R346） of Ciunamomi Cortex and Cinnamomi Ramulus ranged from 0.0121 to 0.0467 and 0.0598 to 0.182, respectively. This ratio could be used to discriminate Cinnamomi Cortex （〈0.05） and Cinnamomi Ramulus （〉0.05）. The extraction rates （Dn） of seven compounds in boiling water were different, with the lowest dissolution for cinnamaldehyde （〈3%） and the highest for cinnamic acid （about 60%）.

基于营卫理论探讨桂枝-赤芍配伍重塑肿瘤血管微环境的网络药理学机制

目的:采用网络药理学方法预测桂枝-赤芍配伍影响肿瘤血管生成的潜在靶点和通路,从分子网络药理学水平探索该配伍重塑肿瘤血管微环境的网络药理学机制。方法:采用中药系统药理学数据库与分析平台(TCMSP)检索桂枝、赤芍的化学成分和潜在靶点,选择口服生物利用度≥30%和类药性≥0.18作为化学成分筛选条件;在GeneCards数据库中检索血管生成的靶点;利用Cytoscape 3.6.0软件绘制桂枝-赤芍配伍-化合物-靶点-血管生成网络;使用STRING 11.0在线软件构建蛋白质-蛋白质相互作用(PPI)网络并挖掘核心靶点;采用David Bioinformatics Resources数据库对该复方活性成分潜在的靶点网络中的蛋白进行基因本体(GO)功能富集分析和京都基因与基因组百科全书(KEGG)通路富集分析。结果:桂枝-赤芍配伍的33种有效成分作用于血管生成过程的77个靶点,PPI网络的核心靶点包括蛋白激酶B(Akt)1、JUN、白细胞介素6、基质金属蛋白酶、血管内皮生长因子A、一氧化氮合酶2和缺氧诱导因子-1α等多个蛋白。GO功能富集分析提示,该配伍的关键蛋白主要参与了DNA结合转录激活剂活性、血红素结合、抗氧化活性、核受体活性和转录因子活性等生物过程。KEGG通路富集分析显示,该配伍参与了缺氧诱导因子-1(HIF-1)信号通路、肿瘤蛋白53信号通路、细胞凋亡信号通路、表皮生长因子受体酪氨酸激酶抑制剂耐药信号通路、血管内皮生长因子(VEGF)信号通路和磷脂酰肌醇3激酶-Akt信号通路等,提示桂枝-赤芍配伍与肿瘤血管生成的关系最为密切。结论:桂枝-赤芍配伍中的黄芩素、谷甾醇和鞣花酸等成分可能通过HIF-1信号通路、VEGF信号通路影响肿瘤血管生成,干预肿瘤的生物学行为。

桂枝及桂枝类方治疗心血管疾病研究进展

桂枝是我国传统中药材,因其具有发汗解肌、平冲降逆、温经通脉、温阳助气等功效被广泛应用于医疗实践中,特别是在心血管疾病中尤为突出。现代研究发现桂枝及桂枝类方具有保护血管和调节血管活性因子、抗炎、抗氧化应激、改善冠状动脉循环和心肌纤维化、降血压、防治心力衰竭等作用,充分发挥对心血管疾病的防治作用。文章综述了桂枝及桂枝类方从抗冠心病、抗高血压、改善冠状动脉循环和心肌纤维化、调节血脂代谢、改善心肌缺血再灌注、防治心力衰竭等内容,以求为桂枝及桂枝类方在心血管疾病的应用和研究提供参考和依据。

经典名方中桂枝的关键信息考证与质量评价研究

目的通过本草考证和多批次道地产区桂枝药材的质量评价,为含桂枝的经典名方的研究提供依据与参考。方法对历代本草和经典医书进行考证,对经典名方中桂枝的药用部位、基原、产地与品质进行考证;并根据考证结果收集4个道地产地的15批次合格桂枝药材,建立适用于桂枝药材的高效液相色谱(HPLC)特征图谱方法并进行方法学验证;通过聚类分析、主成分分析和偏最小二乘-判别分析方法,结合特征图谱数据和桂皮醛含量,对古籍考证的道地产区桂枝药材的质量一致性进行综合评价。结果通过古籍考证,确定了经典名方中所用桂枝的药用部位(嫩枝)、基原(樟科植物肉桂)、产地(广东、广西);建立了通过方法学验证的HPLC特征图谱方法,形成的共有对照特征图谱共计10个共有特征峰,并指认出香豆素、肉桂酸、桂皮醛以及2-甲氧基肉桂醛4个色谱峰;3个化学识别分析结果均表明古籍考证的道地产区桂枝药材质量具有一致性。结论经典名方中桂枝选用樟科植物肉桂(Cinnamomum cassia Presl)的干燥嫩枝,产地可选用广西和广东两地;建立的桂枝特征图谱方法适用于桂枝的质量控制研究。

基于基准关联度与信息熵权法优选桂枝配方颗粒中挥发性成分的β-环糊精包合工艺

目的结合基准关联度与信息熵权法,采用正交试验对β-环糊精(β-Cyclodextrin,β-CD)与桂枝配方颗粒中挥发性成分的包合工艺进行优化。方法在单因素考察的基础上,选择β-CD与桂枝芳香水的投料比、包合温度、包合时间为主要影响因素,以包合物中桂皮醛的包合率、载药量及基准关联度为评价指标,采用信息熵权法计算各评价指标的权重系数,进行综合评价和优化正交试验包合工艺。通过薄层色谱法、紫外可见吸收光谱、傅里叶红外光谱、X射线衍射等方法对包合物进行表征。结果优选的最佳包合工艺为β-CD与芳香水的投料比3∶100(g·mL^(-1)),包合温度50℃,包合时间1 h。经验证,桂皮醛包合率为80.48%,载药量为8.63%,基准关联度为0.91。薄层、紫外、红外等表征实验表明芳香水中挥发性成分成功进入β-CD空腔,包合物制备成功。结论优选的包合工艺稳定可行,可为桂枝配方颗粒的制剂工艺研究提供参考。

基于网络药理学和免疫浸润探讨路路通-桂枝作用于乳腺癌免疫调节机制研究

目的利用网络药理学和免疫浸润探讨路路通-桂枝作用于乳腺癌(Breast cancer,BC)免疫调节的作用机制。方法分别利用TCMSP、GeneCards等数据库获得路路通-桂枝的有效成分及靶点、BC以及免疫调节的相关基因。通过Cytoscape软件构建药物-成分-靶点网络图,同时使用STING网站构建蛋白相互作用信息图(PPI)。使用DA VID数据库对交集基因进行GO功能富集和KEGG通路富集分析,并通过分子对接预测活性成分与关键靶点的结合活性,使用GEPIA、TIMER数据库对核心靶标进行表达和免疫浸润分析。结果共获得11个活性成分,药物-疾病共同靶蛋白23个。PPI显示,前4位关键靶点为JUN、ESR1、CASP3、HSP90AA1。突出活性成分为beta-sitosterol。KEGG富集结果表明,p53信号通路是其关键的信号通路。分子对接结果表明关键成分与关键靶点具有良好的结合活性。这些结果在mRNA表达水平、生存曲线和免疫浸润方面得到了进一步验证。结论路路通-桂枝通过多成分、多靶点、多途径的方式发挥免疫调节治疗BC的作用,从而为其临床应用及相关机制的研究提供了理论依据。

麻黄-桂枝药对治疗呼吸系统疾病的临床应用

麻黄是指麻黄科的草麻黄、中麻黄或木贼麻黄的草质茎部,桂枝是樟科植株肉桂的嫩枝。麻黄与桂枝均为解表中药,二者属于相须配伍。目前关于麻黄-桂枝药对的研究多集中于二药配伍的化学成分及作用机制,关于麻黄-桂枝药对的临床应用研究尚且较少,现将通过研究总结近年来麻黄、桂枝的相关文献,对麻黄与桂枝的药理作用、麻黄与桂枝的炮制方法与用量、麻黄与桂枝配伍的作用、含麻黄-桂枝药对的方剂在呼吸系统疾病中的临床应用这4个方面进行综述。

Antipyretic Effect of Herba Ephedrae-Ramulus Cinnamomi Herb Pair on Yeast-Induced Pyrexia Rats: A Metabolomics Study

Objective： To investigate the antipyretic mechanism of Herba Ephedrae （Eph）-Ramulus Cinnamomi （RC） herb pair on yeast-induced pyrexia in rats. Methods： Totally 30 qualified male SD rats were randomly assigned to the normal control （NC） group, the pyrexia model （model） group, the Eph, RC and Eph-RC treatment groups by a random digital table, 6 rats in each group. Each rat received a 20% aqueous suspension of yeast （10 mL/kg） except the NC group. The 3 treatment groups were administered 8.1, 5.4 and 13.5 g/kg Eph, RC and Eph-RC respectively at 5 and 12 h after yeast injection, the NC group and the model groups were administered equal volume of distilled water. Rectal temperatures were measured at 0, 6, 8, 10, 12, 15, 18, 24 and 30 h and urine was collected prior to yeast injection and at 6, 10, 18, 24, 30, and 36 h after yeast injection. Then urine metabolomic profiling by gas chromatography tandem mass spectrometry, coupled with multivariate statistical analysis and pattern recognition techniques were used to explore the antipyretic effects of Eph-RC. Partial least squares discriminate analysis was used to analyze the metabolomics dataset including classification and regression in metabolomics plot profiling. Results： Compared with the NC group, rectal temperatures were significantly higher in the model group （P〈0.01）, while 3 treatment groups decreased significantly compared with the model group （P〈0.05 or P〈0.01）. Rectal temperatures of Eph-RC-treated rats started to go down at 6 h, and markedly decreased at 8, 12, 15, 18 and 24 h （P〈0.05 or P〈0.01）, while those of the Eph and RC groups had decreased firstly at 8 h and were markedly lower at 12 h （P〈0.05 or P〈0.01）. Seventeen potential biomarkers related to pyrexia were confirmed and identified, including pyruvic acid, L-phenylalanine, L-tyrosine, phenylacetic acid, hippuric acid, succinic acid, citrate and so on. Eight potential alterations of metabolic pathways including phenylalanine metabolism, citrate cycle, tryptophan metabolism, biosynthesis of valine, leucine and isoleucine, were identified in relation to the antipyretic effects of Eph-RC using MetPA software. Conclusion： The antipyretic effect of Eph-RC herb pair on yeast-induced pyrexia in rats involved correction of perturbed amino acid, fatty acid, and carbohydrate metabolism according to the metabolic pathway analysis with MetPA.

Effect of Rhizoma Polygoni Cuspidati and Ramulus Cinnamomi Compatibility on Uric Acid Metabolism and Urinary Neutrophil Gelatinase-Associated Lipocalin and Kidney Injury Molecule-1 in Rats with Hyperuricemia

Objective：To explore the effects of Rhizoma Polygoni Cuspidati and Ramulus Cinnamomicompatibility（PR） on uric acid metabolism and the expression of urinary neutrophil gelatinase-associated lipocalin（NGAL） and kidney injury molecule-1（KIM-1） in rats with hyperuricemia. Methods：Seventy male Sprague Dawley（SD） rats were randomly divided into 7 groups with 10 rats per group, including the normal group, model group, allopurinol group, benzbromarone group and PR groups at 3 doses（3.5, 7, 14 g/kg）. Except the normal group, rats of the other groups were intragastrically administered 100 mg/kg hypoxanthine and 250 mg/kg ethambutol, and subcutaneously injected with 200 mg/kg potassium oxonate. All rats were continuously modeled for 17 days, and gavaged with corresponding drugs. The rats of the normal and model groups were gavaged with saline, once a day, for 2 weeks. The levels of serum uric acid（SUA）, blood urea nitrogen（BUN） and creatinine（Cr） were determined. In addition, the contents of NGAL and KIM-1 in urine and the m RNA and protein expressions of xanthine oxidase（XOD） in liver of hyperuricemia rats were measured by reverse transcription polymerase chain reaction（RT-PCR） and Western blot, respectively. Moreover, the pathological changes of kidney were analyzed by hematoxylin and eosin（HE） stain method. Results：Compared with the normal group, the levels of SUA, BUN, NGAL and KIM-1 and the expressions of hepatic XOD m RNA and protein in the hyperuricemia rats were increased significantly（P〈0.01）. PR significantly decreased the levels of SUA, BUN, NGAL and KIM-1 and down-regulated the m RNA and protein expressions of hepatic XOD（P〈0.05 or P〈0.01）. In addition, the pathological changes of kidney were significantly suppressed by oral administration of PR. Conclusions：PR ameliorated uric acid metabolism and protected renal function, the underlying mechanism was mediated by decreasing the levels of SUA, BUN, NGAL and KIM-1, inhibiting the expression of hepatic XOD and ameliorating the pathological change of kidney.

黄芪桂枝五物汤加减对肩周炎患者肩关节功能、炎性因子和血清5-HT、PGE2的影响

目的探讨黄芪桂枝五物汤加减对肩周炎患者肩关节功能、炎性因子和血清5-HT、PGE2的影响。方法选取2022年2月—2023年2月西安市阎良区人民医院收治的80例肩周炎患者作为研究对象,应用随机数表法将其分为观察组与对照组,每组40例。对照组采取常规治疗,观察组在对照组治疗基础上联合黄芪桂枝五物汤加减治疗,应用Constant-Murley评分及视觉模拟量表(Visual simulation scale,VAS)评价患者治疗前后的肩关节功能变化,并比较其炎性因子水平及血清中5-羟色胺(5-hydroxytryptamine,5-HT)和前列腺素E2(Prostaglandin E2,PGE2)表达水平。结果治疗前两组患者肩关节功能评分、疼痛评分比较,差异无统计学意义(P>0.05),治疗后两组患者肩关节功能评分均升高,且观察组高于对照组,差异有统计学意义(P<0.05);疼痛评分均降低,且观察组疼痛评分低于对照组,差异有统计学意义(P<0.05);治疗前两组患者肿瘤坏死因子-α(Tumor necrosis factor-α,TNF-α)、转化生长因子-β1(Transforming growth factor-βone,TGF-β1)、白细胞计数(White blood cell count,WBC)、C反应蛋白(C-reactive protein,CRP)水平比较,差异无统计学意义(P>0.05),治疗后两组患者TNF-α、TGF-β1、WBC、CRP水平均降低,且观察组低于对照组,差异有统计学意义(P<0.05);治疗前两组患者5-HT、PGE2比较,差异无统计学意义(P>0.05),治疗后两组患者5-HT、PGE2均降低,且观察组低于对照组,差异有统计学意义(P<0.05)。结论对肩周炎患者在常规治疗基础上联合黄芪桂枝五物汤加减治疗可改善患者肩关节功能,降低疼痛程度,减轻机体炎性反应水平,其治疗机制可能与血清5-HT、PGE2的降低具有一定关系,值得临床应用。

Preventive effect of different compatibilities of Ramulus Cinnamomai and Radix Paeomiae alba in Guizhi decoction on cardiac sympathetic denervation induced by 6-OHDA

Objective To observe the preventive effect of different compatibilities of Ramulus Cinnamomi(RC)and Radix Paeomiae alba(RPA)in Guizhi Decoction(GZD)on neurotransmitters and their rate-limiting enzymes,and neurotrophic factors of cardiac sympathetic denervation model rats induced by 6-hydroxydopamine(6-OHDA).Methods Totally 54 male Wistar rats were randomly divided into 6 groups,i.e.,the blank control group。

桂枝茯苓胶囊对实验大鼠血浆内雌二醇、黄体酮、催乳素的影响

目的 :探讨桂枝茯苓胶囊对实验性高雌、孕激素大鼠血浆内雌二醇、黄体酮、催乳素的影响。方法 :取雌性SD大鼠 10 0只给大鼠腹腔注射 ,苯甲酸雌二醇及黄体酮制作高雌二醇、黄体酮大鼠模型 ,将大鼠随机分成 5组 ,空白对照组、模型组 ,他莫昔芬对照组及桂枝茯苓胶囊 2 0 0 ,4 0 0mg·kg- 1组 ,每组2 0只 ,空白对照组和模型组给等体积蒸馏水 ,其余组分别给桂枝茯苓胶囊混悬液 2 0 0 ,4 0 0mg·kg- 1和他莫昔芬 3mg·kg- 1,每日灌胃 ,共 30d。用放射免疫方法测定各组实验性大鼠模型血浆内雌二醇、黄体酮、催乳素的含量。结果 :桂枝茯苓胶囊 2 0 0与4 0 0mg·kg- 1组可明显降低高雌、孕激素大鼠模型血浆雌二醇和黄体酮 ,2组雌二醇分别为 (12 7±s5 2 )ng·L- 1和 (15 3± 4 9)ng·L- 1,黄体酮分别为 (12± 8) μg·L- 1和 (13± 7) μg·L- 1,与模型组雌二醇(2 71± 10 3)ng·L- 1和黄体酮为 (2 1± 15 ) μg·L- 1比较 ,差异均有显著意义 ,P <0 .0 5 ,但对血浆催乳素影响不大。结论 :桂枝茯苓胶囊能够显著降低异常升高的实验性高雌、孕激素大鼠模型的雌二醇、黄体酮的血浓度。

RP-HPLC法测定桂枝及桂枝茯苓胶囊中桂皮醛和桂皮酸含量

目的 :测定桂枝及桂枝茯苓胶囊中桂皮醛和桂皮酸的含量。方法 :用RP HPLC法 ,ZobaxODS柱为固定相 ,乙腈∶0 .1%磷酸溶液 (34∶76 )为流动相 ,检测波长 2 85nm。结果 :桂皮醛在 3.34～ 5 3.4 μg·mL-1,桂皮酸在 0 .80 4～ 12 .9μg·mL-1呈现良好的线形关系 ,相关系数分别为 0 .9996、0 .9999。加样回收率桂枝中桂皮醛为 98.6 % ,RSD为 1.35 % (n=6 ) ,桂皮酸为 99.2 % (n =6 )RSD为 0 .97%。桂枝茯苓胶囊中桂皮醛为 97.4 % ,RSD为 1.6 2 % (n =6 ) ,桂皮酸为10 0 .1% ,RSD为 0 .73% (n =6 )。结论 :本方法简便、准确、重现性好。

桂枝的化学成分研究

目的研究中药桂枝(Ramulus Cinnamomi)的化学成分。方法利用硅胶柱色谱、Sephadex LH-20柱色谱及Pe-HPLC等方法进行分离纯化,根据理化性质及波谱分析鉴定化合物的结构。结果分离得到11个已知化合物,分别鉴定为反式桂皮酸(1)、花旗松素(2)、原儿茶酸(3)、反式-邻羟基桂皮酸(4)、原儿茶醛(5)、苯甲酸(6)、反式-邻甲氧基桂皮酸(7)、顺式-邻甲氧基桂皮酸(8)、对羟基苯甲酸(9)、香豆素(10)、胡萝卜苷(11)。结论化合物5为首次从该属植物中分离得到,化合物2、4、6、8、9首次从该植物中分离得到。

桂枝中桂皮醛、肉桂酸的含量与分布研究

目的以桂皮醛和肉桂酸为指标,优化桂枝的提取工艺,并测定不同地区桂枝中桂皮醛及肉桂酸的含量,探讨桂枝皮部 与木质部的含量差异。方法 高效液相色谱法。色谱柱:Kromasil C18(4．6 mm×250 mm,5μg);流动相:乙腈-0．I％磷酸水溶液 (43:57);检测波长:285 nm,温度:20℃,流速:1 mL·min-1。结果 确定了桂枝提取的最佳工艺,即用甲醇50 mL,60℃热提40 min,可使桂皮醛和肉桂酸充分地被提取。结论测得广西平南县桂枝中桂皮醛的含量最高,广西防城市桂枝中肉桂酸的含量 最高。桂枝皮部中桂皮醛的含量较高,木质部中肉桂酸的含量较高。

桂枝、肉桂挥发油化学成分GC-MS分析

以水蒸气蒸馏法分别提取桂枝、肉桂中的挥发油,并用气相色谱-质谱联用对其化学成分进行分析。肉桂挥发油中10种成分在桂枝油中未检出,而桂枝挥发油中16种成分在肉桂油中未检出。

桂枝中抗过敏活性成分的研究

目的跟踪确定中药桂枝中的抗过敏活性成分。方法桂枝通过70%乙醇溶液提取,不同有机溶剂萃取及大孔树脂HP-20、聚酰胺和Sephadex LH-20对样品进行纯化,以透明质酸酶抑制率为指标对各组分抗过敏活性进行跟踪,确定抗过敏活性最强的组分,通过薄层层析、显色反应和光谱鉴定对抗过敏活性最强的组分定性。结果桂枝大孔树脂40%乙醇洗脱部分的酶抑制率为62.3%,过聚酰胺40%丙酮洗脱部分酶抑制率达到73%,过凝胶甲醇洗脱后,活性成分酶抑制率最高达93%。结论桂枝中强过敏组分为缩合类单宁。

麻黄桂枝药对解热作用及其机制的实验研究

目的探讨麻黄桂枝药对水煎液对干酵母致热大鼠的解热作用及其机制。方法复制干酵母致大鼠发热动物模型,观察麻黄桂枝药对水煎液对发热大鼠直肠温度的影响,并采用放射免疫法测定下丘脑中前列腺素E2(PGE2)和环磷酸腺苷(cAMP)含量的变化。结果给药3 h后,与模型组比较,麻黄桂枝低、中、高三个剂量组均能显著降低干酵母致热大鼠的肛温(P<0.05);与模型组比较,麻黄桂枝中、高剂量组能显著抑制下丘脑中PGE2和cAMP的含量升高(P<0.05)。结论麻黄桂枝药对水煎液解热作用明显,推断麻黄桂枝药对的解热作用机制可能与抑制脑组织中PGE2、cAMP生成和释放有关。