Polyamines and the NMDA receptor: Modifying intrinsic activities with aromatic substituents
摘要:
Thirty-four spermidine (SPD) and spermine (SPM) derivatives with aromatic substituents were synthesized and tested as inhibitors of specific binding of the NMDA channel blocker [H-3]MK-801 to membranes prepared from rat hippocampus and cerebral cortex. SPD and SPM derivatives with aromatic substituents at the primary amino groups were the most potent inhibitors (IC50 3.9-4.7 mu M). These compounds most likely act directly at the NMDA ion channel, since 30 pM SPM had no pronounced influence on their inhibiting activities. SPD derivatives with aromatic substituents at the secondary amino group were either inactive or highly SPM-sensitive inhibitors (IC50 10-82 mu M), depending on the size of the substituent. Our results support the hypothesis that an aromatic interaction site near the center of polyamine derivatives contributes to polyamine inverse agonism. (c) 2006 Elsevier Ltd. All rights reserved.
Polyamine derivatives as inhibitors of trypanothione reductase and assessment of their trypanocidal activities
摘要:
Trypanothione reductase (TR) occurs exclusively in trypanosomes and leishmania, which are the etiological agents of many diseases. TR plays a vital role in the antioxidant defenses of these parasites and inhibitors of TR have potential as antitrypanosomal agents. We describe the syntheses of several spermine and spermidine derivatives and the inhibiting effects of these compounds on T. cruzi TR. All of the inhibiting compounds displayed competitive inhibition of TR-mediated reduction of trypanothione disulfide. The three most effective compounds studied were N-4,N-8-bis(3-phenylpropyl)spermine (12), N-4,N-8-bis(2-naphthylmethyl)spermine (14), and N-1,N-8-bis(2-naphthylmethyl)spermidine (21), with K-i values of 3.5, 5.5 and 9.5 mu M, respectively. Compounds 12, 14, and 21 were found to be potent trypanocides in vitro with IC50 values ranging from 0.19 to 0.83 mu M against four T. brucei ssp. strains. However, these compounds did not prolong the lives of mice infected with trypanosomes. This work indicates that certain polyamine derivatives which target a unique pathway in Trypanosomatidae have potential as antitrypanosomal agents. (C) 1997 Elsevier Science Ltd.
Polyamines with N -(3-phenylpropyl) substituents are effective competitive inhibitors of trypanothione reductase and trypanocidal agents
作者:Zhili Li、Michael W Fennie、Bruce Ganem、Matthew T Hancock、Muris Kobašlija、Donna Rattendi、Cyrus J Bacchi、Mary C O'Sullivan
DOI:10.1016/s0960-894x(00)00643-0
日期:2001.1
Several N-(3-phenylpropyl)-substituted spermidine and spermine derivatives were prepared and found to be potent competitive inhibitors of Trypanosoma cruzi trypanothione reductase (seven compounds with K-i values < 5 M are described). The most effective inhibitor studied was compound 12 with a K-i value of 0.151 muM. Six of the compounds described are also effective trypanocides with IC50 values <1 M. (C) 2001 Elsevier Science Ltd. All rights reserved.
Polyamine derivatives as inhibitors of trypanothione reductase and assessment of their trypanocidal activities
作者:Mary C. O'Sullivan、Qibing Zhou、Zhili Li、Timothy B. Durham、Donna Rattendi、Schennella Lane、Cyrus J. Bacchi
DOI:10.1016/s0968-0896(97)00157-0
日期:1997.12
Trypanothione reductase (TR) occurs exclusively in trypanosomes and leishmania, which are the etiological agents of many diseases. TR plays a vital role in the antioxidant defenses of these parasites and inhibitors of TR have potential as antitrypanosomal agents. We describe the syntheses of several spermine and spermidine derivatives and the inhibiting effects of these compounds on T. cruzi TR. All of the inhibiting compounds displayed competitive inhibition of TR-mediated reduction of trypanothione disulfide. The three most effective compounds studied were N-4,N-8-bis(3-phenylpropyl)spermine (12), N-4,N-8-bis(2-naphthylmethyl)spermine (14), and N-1,N-8-bis(2-naphthylmethyl)spermidine (21), with K-i values of 3.5, 5.5 and 9.5 mu M, respectively. Compounds 12, 14, and 21 were found to be potent trypanocides in vitro with IC50 values ranging from 0.19 to 0.83 mu M against four T. brucei ssp. strains. However, these compounds did not prolong the lives of mice infected with trypanosomes. This work indicates that certain polyamine derivatives which target a unique pathway in Trypanosomatidae have potential as antitrypanosomal agents. (C) 1997 Elsevier Science Ltd.
Polyamines and the NMDA receptor: Modifying intrinsic activities with aromatic substituents
作者:Michael L. Berger、Abdallah Y. Bitar、Matthew J. Waitner、Patrick Rebernik、Mary C. O’Sullivan
DOI:10.1016/j.bmcl.2006.03.015
日期:2006.6
Thirty-four spermidine (SPD) and spermine (SPM) derivatives with aromatic substituents were synthesized and tested as inhibitors of specific binding of the NMDA channel blocker [H-3]MK-801 to membranes prepared from rat hippocampus and cerebral cortex. SPD and SPM derivatives with aromatic substituents at the primary amino groups were the most potent inhibitors (IC50 3.9-4.7 mu M). These compounds most likely act directly at the NMDA ion channel, since 30 pM SPM had no pronounced influence on their inhibiting activities. SPD derivatives with aromatic substituents at the secondary amino group were either inactive or highly SPM-sensitive inhibitors (IC50 10-82 mu M), depending on the size of the substituent. Our results support the hypothesis that an aromatic interaction site near the center of polyamine derivatives contributes to polyamine inverse agonism. (c) 2006 Elsevier Ltd. All rights reserved.