study is to develop peptide-based platelet-derived growth factor receptor β (PDGFRβ) imagingprobes and examine the effects of several linkers, namely un-natural amino acids (D-alanine and β-alanine) and ethylene-glycol (EG), on the properties of Ga-DOTA-(linker)-IPLPPPRRPFFK peptides. Seven radiotracers, 67Ga-DOTA-(linker)-IPLPPPRRPFFK peptides, were designed, synthesized, and evaluated. The stability
Cucurbituril–Ferrocene: Host–Guest Based Pretargeted Positron Emission Tomography in a Xenograft Model
作者:Vilma I. J. Jallinoja、Brandon D. Carney、Meiying Zhu、Kavita Bhatt、Paul J. Yazaki、Jacob L. Houghton
DOI:10.1021/acs.bioconjchem.1c00280
日期:2021.8.18
chemistry pretargeting agents for positron emission tomography in BxPC3 xenografted nude mice. The viability of the platform was studied via in vivo biodistribution and positron emission tomography. Tumor uptake of [68Ga]Ga-NOTA-PEG3-NMe2-Fc was significantly higher in mice which received CB7-M5A prior to the radioligand injection (pretargeted) (3.3 ± 0.7%ID/g) compared to mice which only received the radioligand
Gallium and indium complexes with new hexadentate bis(semicarbazone) and bis(thiosemicarbazone) chelators
作者:Viviana S. Prado、Renan C. F. Leitao、Francisco Silva、Lurdes Gano、Isabel C. Santos、Fabio L. N. Marques、António Paulo、Victor M. Deflon
DOI:10.1039/d0dt04028b
日期:——
The synthesis of two new hexadentate potentially tetra-anionic acyclic chelators, an N2O4-donor bis(semicarbazone) (H4bsc) and an N2O2S2-donor bis(thiosemicarbazone) (H4btsc), is described. Coordination reactions of the ligands with gallium and indium precursors were investigated and yielded the complexes [Ga(Hbsc)] (1) and [In(Hbtsc)] (2), respectively. Ligands and complexesstructures were confirmed
N 2 O 4-供体双(半碳ators)(H 4 bsc)和N 2 O 2 S 2-供体双(硫代半碳zone)(H 4 btsc)的两个新的六齿潜在四阴离子无环螯合剂的合成是描述。研究了配体与镓和铟前体的配位反应,分别得到了配合物[Ga(Hbsc)](1)和[In(Hbtsc)](2)。配体和配合物的结构已通过多种技术证实,包括FTIR,NMR(1 H,13C,COSY,HSQC),ESI(+)-MS和单晶X射线衍射分析。还合成了放射性同系物[ 67 Ga(Hbsc)](1 *)和[ 111 In(Hbtsc)](2 *),并通过HPLC和ITLC分析验证了它们的放射性标记收率和放射化学纯度。CD-1小鼠组中的生物分布分析表明,肝脏和肠中放射性复合物的摄取量很高,其中1 *保留率更高。在体外和体内测定法揭示的更高的稳定性1 *相比2 *,即在血液中。结果表明,放射性复合物1 * 可以进一步研究,因为它可以高产率(>
Galbofloxacin: a xenometal-antibiotic with potent <i>in vitro</i> and <i>in vivo</i> efficacy against <i>S. aureus</i>
作者:Apurva Pandey、Dariusz Śmiłowicz、Eszter Boros
DOI:10.1039/d1sc04283a
日期:——
tracer-based uptake and pharmacokinetic assessment of our lead compound, culminating in in vivo efficacy studies in a soft tissue model of infection. Galbofloxacin exhibits a minimum inhibitory concentration of (MIC98) 93 nM in wt S. aureus, exceeding the potency of the parent antibiotic ciprofloxacin (0.9 μM). Galbofloxacin is a protease substrate that can release the antibiotic payload in the bacterial cytoplasm
Novel bifunctional DATA chelator for quick access to site-directed PET <sup>68</sup>Ga-radiotracers: preclinical proof-of-principle with [Tyr<sup>3</sup>]octreotide
作者:Berthold A. Nock、Aikaterini Kaloudi、Johannes Nagel、Jean-Philippe Sinnes、Frank Roesch、Theodosia Maina
DOI:10.1039/c7dt01684k
日期:——
Comparison of 68Ga-DATA-TOC vs. 68Ga-DOTA-TOC in sst2-positive cells and tumor-bearing mice revealed the suitability of DATA for easy access to 68Ga-labeled vectors.