Synthesis and Evaluation of Technetium-99m- and Rhenium-Labeled Inhibitors of the Prostate-Specific Membrane Antigen (PSMA)
摘要:
The prostate- specific membrane antigen (PSMA) is increasingly recognized as a viable target for imaging and therapy of cancer. We prepared seven 99'Tc/Re-labeled compounds by attaching known Tc/Re chelating agents to an amino-functionalized PSMA inhibitor (lys-NHCONH-glu) with or without a variable length linker moiety. Ki values ranged from 0.17 to 199 nM. Ex vivo biodistribution and in vivo imaging demonstrated the degree of specific binding to engineered PSMA+ PC3 PIP tumors. PC3-PIP cells are derived from PO that have been transduced with the gene for PSMA. Despite demonstrating nearly the lowest PSMA inhibitory potency of this series, [99`Tc(COXLI)]+ (LI = (2-pyridylmethVI)2N(CH,,)4CH(COH)NHCO-(CH2)6CO-NH-lys-NHCONH-glu) showed the highest, most selective PIP tumor uptake, at 7.9 4.0% injected dose per gram of tissue at 30 min postinjection. Radioactivity cleared from nontarget tissues to produce a PIP to flu (PSMA-PC3) ratio of 44:1 at 120 min postinjection. PSMA can accommodate the steric requirements of 99"Tc/Re complexes within PSMA inhibitors, the best results achieved with a linker moiety between the e amine of the urea lysine and the chelator.
Single Modification at the N‐Terminus of Norvancomycin to Combat Drug‐Resistant Gram‐Positive Bacteria
摘要:
AbstractIn the arsenal of glycopeptide antibiotics, norvancomycin, which differs from vancomycin by a single methyl group, has received much less attention. Facing the risks of serious antibiotic resistance and even the collapse of last‐line defenses, we designed and synthesized 40 novel norvancomycin derivatives to combat the threat. 32 compounds are single N‐terminally modified derivatives generated through simple and efficient methods. Diversity at the N‐terminus was greatly enriched, mainly by lipophilic attachment and strategies for the introduction of lipo‐sulfonium moieties for extensive structure–activity relationship analysis. The first incorporation of a sulfonium moiety into the norvancomycin structure gave rise to compounds that exhibited 4‐ to 2048‐fold higher activity against vancomycin‐resistant bacteria VISA and VRE. This N‐terminal modification for norvancomycin provides an alternatively useful and promising strategy to restore the antibacterial activity of glycopeptide antibiotics against resistant bacteria, highlighting the same importance of the N‐terminal site as well as the vancosamine position, which is worth further study and development.
Alkyl linker effects on the coordination topology of ditopic di(2-pyridylmethyl)amine carboxylate ligands with Zn<sup>II</sup>and Cu<sup>II</sup>: polymers<i>vs.</i>macrocycles
作者:Kiattipoom Rodpun、Allan G. Blackman、Michael G. Gardiner、Eng Wui Tan、Carla J. Meledandri、Nigel T. Lucas
DOI:10.1039/c5ce00375j
日期:——
[Zn(C3COO)(H2O)](ClO4)·3.5H2O}n (1), [Zn(C4COO)(H2O)]4(ClO4)4·1.5H2O}n (2), [Zn(C5COO)(H2O)](ClO4)}n (3), [Cu(C3COO)](ClO4)·MeOH}n (4), [Cu(C4COO)(H2O)]2(ClO4)2·2H2O}n (5) and [Cu(C5COO)(H2O)](ClO4)·2H2O}n (6). In contrast, the ligands with longer alkyl chains (n ≥ 7) participate in Zn2L2 metallomacrocyclic structures [Zn(C7COO)(H2O)](ClO4)}2 (7), [Zn2(C10COO)2(H2O)2](ClO4)2·2H2O·MeOH (8) and [Z
LABELED INHIBITORS OF PROSTATE SPECIFIC MEMBRANE ANTIGEN (PSMA) BIOLOGICAL EVALUATION, AND USE OF IMAGING AGENTS
申请人:THE JOHNS HOPKINS UNIVERSITY
公开号:US20150246144A1
公开(公告)日:2015-09-03
The prostate-specific membrane antigen (PSMA) is increasingly recognized as a viable target for imaging and therapy of cancer. Various 99mTc/Re-labeled compounds were prepared by attaching known Tc/Re chelating agents to an amino-functionalized PSMA inhibitor with or without a variable length linker moiety. Ex vivo biodistribution and in vivo imaging demonstrated the degree of specific binding to engineered PSMA+PC3 PIP tumors.
LABELED INHIBITORS OF PROSTATE SPECIFIC MEMBRANE ANTIGEN (PSMA), BIOLOGICAL EVALUATION, AND USE AS IMAGING AGENTS
申请人:Pomper Martin Gilbert
公开号:US20110064657A1
公开(公告)日:2011-03-17
The prostate-specific membrane antigen (PSMA) is increasingly recognized as a viable target for imaging and therapy of cancer. Various 99mTc/Re-labeled compounds were prepared by attaching known Tc/Re chelating agents to an amino-functionalized PSMA inhibitor with or without a variable length linker moiety. Ex vivo biodistribution and in vivo imaging demonstrated the degree of specific binding to engineered PSMA+ PC3 PIP tumors.
Labeled inhibitors of prostate-specific membrane antigen (PSMA), biological evaluation, and use as imaging agents
申请人:The Johns Hopkins University
公开号:EP2921482A2
公开(公告)日:2015-09-23
The present invention provides radiolabeled compounds of formulae (VII) and (VIII) comprising a urea derivative, a linker, a metal chelating group, and a radiolabeled or isotopically labelled metal, pharmaceutical compositions comprising such radiolabeled compounds and methods of detecting PSMA expressing tumors. The compounds of the invention are useful for providing diagnosis of cancer.
Labeled inhibitors of prostate specific membrane antigen (PSMA) biological evaluation, and use of imaging agents
申请人:THE JOHNS HOPKINS UNIVERSITY
公开号:US10039845B2
公开(公告)日:2018-08-07
The prostate-specific membrane antigen (PSMA) is increasingly recognized as a viable target for imaging and therapy of cancer. Various 99mTc/Re-labeled compounds were prepared by attaching known Tc/Re chelating agents to an amino-functionalized PSMA inhibitor with or without a variable length linker moiety. Ex vivo biodistribution and in vivo imaging demonstrated the degree of specific binding to engineered PSMA+ PC3 PIP tumors.