Theoretical and Experimental Studies on Inclusion Complexes of Pinostrobin and β-Cyclodextrins
作者:Jintawee Kicuntod、Kanyani Sangpheak、Monika Mueller、Peter Wolschann、Helmut Viernstein、Saeko Yanaka、Koichi Kato、Warinthorn Chavasiri、Piamsook Pongsawasdi、Nawee Kungwan、Thanyada Rungrotmongkol
DOI:10.3390/scipharm86010005
日期:——
Pinostrobin (PNS) belongs to the flavanone subclass of flavonoids which shows several biological activities such as anti-inflammatory, anti-cancerogenic, anti-viral and anti-oxidative effects. Similar to other flavonoids, PNS has a quite low water solubility. The purpose of this work is to improve the solubility and the biological activities of PNS by forming inclusion complexes with β-cyclodextrin (βCD) and its derivatives, heptakis-(2,6-di-O-methyl)-β-cyclodextrin (2,6-DMβCD) and (2-hydroxypropyl)-β-cyclodextrin (HPβCD). The AL-type diagram of the phase solubility studies of PNS exhibited the formed inclusion complexes with the 1:1 molar ratio. Inclusion complexes were prepared by the freeze-drying method and were characterized by differential scanning calorimetry (DSC). Two-dimensional nuclear magnetic resonance (2D-NMR) and steered molecular dynamics (SMD) simulation revealed two different binding modes of PNS, i.e., its phenyl- (P-PNS) and chromone- (C-PNS) rings preferably inserted into the cavity of βCD derivatives whilst only one orientation of PNS, where the C-PNS ring is inside the cavity, was detected in the case of the parental βCD. All PNS/βCDs complexes had a higher dissolution rate than free PNS. Both PNS and its complexes significantly exerted a lowering effect on the IL-6 secretion in LPS-stimulated macrophages and showed a moderate cytotoxic effect against MCF-7 and HeLa cancer cell lines in vitro.
Pinostrobin(PNS)属于黄酮类化合物中的黄烷酮亚类,具有多种生物活性,如抗炎、抗癌、抗病毒和抗氧化作用。与其他黄酮类化合物类似,PNS的水溶性极低。本研究的目的是通过与β-环糊精(βCD)及其衍生物、七聚(2,6-二-O-甲基)-β-环糊精(2,6-DMβCD)和(2-羟丙基)-β-环糊精(HPβCD)形成包合复合物,提高PNS的溶解度和生物活性。PNS的相溶性研究的AL型图显示了以1:1摩尔比形成的包合复合物。包合复合物通过冷冻干燥法制备,并通过差示扫描量热法(DSC)进行表征。二维核磁共振(2D-NMR)和受控分子动力学(SMD)模拟揭示了PNS的两种不同结合模式,即苯基(P-PNS)和色酮(C-PNS)环优先插入βCD衍生物的空腔中,而在母体βCD的情况下,仅检测到一种PNS取向,即C-PNS环位于空腔内。所有PNS/βCD复合物的溶解速率均高于游离PNS。PNS及其复合物均对LPS刺激的巨噬细胞中的IL-6分泌具有