Structure–activity relationships of novel endomorphin-2 analogues with N–O turns induced by α-aminoxy acids
摘要:
Endomorphin-2 (H-Tyr-Pro-Phe-Phe-NH2, EM-2) is a putative endogenous mu-opioid receptor ligand. To study the structure-activity relationship against its receptor, we introduced N-O turns into EM-2 and got the analogues with potent affinities for p-opioid receptor. Our results indicated that N-O turn structures at the PrO2-aminoxy-Phe(3) position of EM-2 analogues played important roles for their affinities. These novel analogues with N-O turns provided a new approach to develop potent analgesics related to EM-2. (c) 2005 Elsevier Ltd. All rights reserved.
Covalently Assembled Dipeptide Nanospheres as Intrinsic Photosensitizers for Efficient Photodynamic Therapy in Vitro
作者:Xiaoke Yang、Jinbo Fei、Qi Li、Junbai Li
DOI:10.1002/chem.201600536
日期:2016.5.4
Monodispersed diphenylalanine‐based nanospheres with excellent biocompatibility are fabricated through a facile covalent reaction‐induced assembly. Interestingly, the nanospheres exhibit red autofluorescence. Most importantly, such assembleddipeptidenanospheres can serve as intrinsicphotosensitizer to convert O2 to singlet oxygen (1O2). Thus, photodynamictherapy in vitro can be achieved effectively. The
具有良好生物相容性的基于单分散二苯丙氨酸的纳米球是通过简便的共价反应诱导组装而制成的。有趣的是,纳米球表现出红色的自发荧光。最重要的是,这样组装的二肽纳米球可以用作固有的光敏剂,以将O 2转化为单线态氧(1 O 2)。因此,可以有效地实现体外光动力疗法。通用策略可以扩展到其他包含伯胺基团的生物分子,以制造潜在的固有光敏剂。
Enzyme-Responsive Release of Doxorubicin from Monodisperse Dipeptide-Based Nanocarriers for Highly Efficient Cancer Treatment In Vitro
作者:He Zhang、Jinbo Fei、Xuehai Yan、Anhe Wang、Junbai Li
DOI:10.1002/adfm.201403119
日期:2015.2
the nanocarriers can be taken in by cells and biodegraded in the cells. In addition, doxorubicin is easily loaded into the nanocarriers with high encapsulation amount, and its release can be triggered by tyrisin under physiological conditions. Noticeably, even at a very low drug concentration, the doxorubicin‐loaded nanocarriers still exhibit a much higher killing capacity of HeLa cells in vitro, compared
Structural studies of [2′,6′-dimethyl-l-tyrosine1]endomorphin-2 analogues: enhanced activity and cis orientation of the Dmt-Pro amide bond
作者:Yoshio Okada、Yoshio Fujita、Takashi Motoyama、Yuko Tsuda、Toshio Yokoi、Tingyou Li、Yusuke Sasaki、Akihiro Ambo、Yunden Jinsmaa、Sharon D. Bryant、Lawrence H. Lazarus
DOI:10.1016/s0968-0896(03)00068-3
日期:2003.5
Analogues of endomorphin-2 (EM-2: Tyr-Pro-Phe-Phe-NH2) (1) were designed to examine the importance of each residue on mu-opioid receptor interaction. Replacement of Tyr(1) by 2',6'-dimethyl-L-tyrosine (Dmt) (9-12) exerted profound effects: [Dmt(1)]EM-2 (9) elevated mu-opioid affinity 4.6-fold (K(i)mu = 0.15 nM) yet selectivity fell 330-fold as delta-affinity rose (K(i)delta = 28.2 nM). This simultaneous increased mu- and delta-receptor bioactivities resulted in dual agonism (IC50 = 0.07 and 1.87 nM, respectively). While substitution of Phe(4) by a phenethyl group (4) decreased mu affinity (K(i)mu 13.3 nM), the same derivative containing Dmt (12) was comparable to EM-2 but also acquired weak delta antagonism (pA(2) = 7.05). H-1 NMR spectroscopy revealed a trans configuration (1:2 to 1:3, cis/trans) in the Tyr-Pro amide bond, but a cis configuration (5:3 to 13:7, cis/trans) with Dmt-Pro analogues. (C) 2003 Elsevier Science Ltd. All rights reserved.