来自Rhododendron capitatum的反聚甲和它们的抗炎活性
Hang Xie1, Qing Shi2, Yu-Meng Miao3
1School of Pharmacy, Fudan University, Shanghai, 201203, People's Republic of China.
Phytochemistry
|May 8, 2025
概括
从Rhododendron capitatum中鉴定出了10种新的美类植物,包括具有独特结构的新型化合物. 一些化合物显示出抑制缺氧诱导因子-1α和炎症反应的潜力.
科学领域:
- 自然产品 化学 化学
- 药用化学 医学化学
- 药理学是指药理学,即药理学是指药理学.
背景情况:
- 罗多龙属是生物活性二次代谢产物的丰富来源.
- 梅洛特类化合物是从美瓦酸盐和酸盐路径中衍生出来的化合物,表现出多样化的生物活性.
- 研究Rhododendron capitatum的化学成分可以导致发现新的生物活性化合物.
研究的目的:
- 从Rhododendron capitatum中分离和特征化美罗特类植物.
- 用先进的光谱和晶体学方法阐明新化合物的结构.
- 评估分离化合物的生物活性,重点关注低氧诱导因子-1α (HIF-1α) 抑制和抗炎作用.
主要方法:
- 使用各种色谱技术分离化合物.
- 通过全面的光谱分析 (NMR,MS) 和X射线晶体学来阐明结构.
- 使用修改的莫舍尔方法和电子圆二元论 (ECD) 计算来确定绝对配置.
- 试验室试验包括缺氧诱导因子-1α (HIF-1α) 响应元素 (HRE) 光酶试验和巨介导炎症反应的评估.
主要成果:
- 他们分离出了10种美罗特类的体对,其中包括6种新化合物: (+/-) - - 资本类A-F, (+) - - 兰胡阿杜因B, (-) - - 鲁比基诺辛G,和 (-) - - - 基基B.
- (+/-) -Capitanoid A代表了第一个报告的有1,2,3,3a,10,10a-hexahydrobenzo[b]cyclopenta[e][1,4]dioxepine系统的美类.
- (+/-) -Capitanoid F是第一个在Rhododendron属中发现的含有 tris-normonoterpene 的美类.
- 几种化合物,包括 (+/-) - 鲁比基诺辛G, (+/-) - 甲基乙烯和 (-) - 罗多诺伊德B,抑制了HIF-1α通路.
- (+) - 安托波格罗门B和 (-) - 罗多诺伊德B通过降低IL-1β的调节抑制了巨细胞介导的炎症.
结论:
- 这项研究成功地鉴定和表征了Rhododendron capitatum中的十种美罗特类,扩大了这个属的已知化学多样性.
- 发现了具有独特结构特征的新型甲类化合物,例如6/7/5异环系统和tris-normonoterpene部分,对天然产品化学做出了重大贡献.
- 已识别的化合物,特别是 (+) - - 甲基甲基乙烯和 (-) - - 罗多诺伊德B,显示出有前途的抗炎和HIF-1α抑制活性,表明潜在的治疗应用.
相关概念视频
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.2K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.2K
01:19Antiasthma Drugs: Leukotriene Modifiers
253
Leukotriene modifiers, or cysteinyl leukotriene receptor antagonists, are medications used to manage chronic asthma. These agents target specific inflammatory mediators produced during arachidonic acid metabolism, an essential process in generating inflammation in the body.
Leukotriene modifiers work through two distinct mechanisms:
Leukotriene modifiers work through two distinct mechanisms:
253
02:30Racemic Mixtures and the Resolution of Enantiomers
18.2K
A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
18.2K
01:16Adrenergic Agonists: Chemistry and Structure-Activity Relationship
2.6K
Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of...
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of...
2.6K
01:29Cholinergic Antagonists: Chemistry and Structure-Activity Relationship
2.1K
Cholinergic antagonists bind to cholinergic receptors and limit the effects of acetylcholine and other cholinergic agonists. Based on the specific cholinergic receptor affinity, these antagonists are classified as muscarinic or nicotinic. Anticholinergics interrupt parasympathetic innervations while sympathetic innervations remain uninterrupted. Muscarinic antagonists are also called 'muscarinic antagonists', 'antimuscarinics', or 'parasympatholytics'. Nicotinic...
2.1K
01:30Adrenergic Agonists: Direct-Acting Agents
1.4K
Drugs that mimic the action of endogenous catecholamines like noradrenaline and adrenaline are called adrenergic agonists or sympathomimetics. Based on their mechanism of action, sympathomimetics can be classified as direct-, indirect-, or mixed-acting sympathomimetics. Direct-acting adrenergic agonists activate adrenoceptors without affecting presynaptic neurons, making them independent of neuronal catecholamine-depleting agents like reserpine and guanethidine.
These agents can be classified...
These agents can be classified...
1.4K