We report the development of dendriticsiRNAnanostructures that are able to penetrate even difficult to transfect cells such as neurons with the help of a special receptor ligand. The nanoparticles elicit strong siRNA responses, despite the dendritic structure. An siRNA dendrimer directed against the crucial rabies virus (RABV) nucleoprotein (N protein) and phosphoprotein (P protein) allowed the suppression
The present invention refers to a conjugate comprising at least one polyunsaturated fatty acid residue, particularly an arachidonic acid residue, more particularly an anandamide (arachidonoyl ethanol amide) residue and covalently bound thereto at least one nucleosidic component selected from nucleic acids, nucleosides and nucleotides. This conjugate is suitable for the transfection of cells such as mammalian cells including human cells with high efficacy. Thus, a new delivery vehicle for therapeutic molecules including antisense molecules, siRNA molecules, miRNA molecules, antagomirs or precursors of such molecules, as well as the therapeutic nucleosides or nucleotides, is provided.
A trithiol bifunctional chelate for 72,77As: A matched pair theranostic complex with high in vivo stability
作者:Yutian Feng、Anthony J. DeGraffenreid、Michael D. Phipps、Tammy L. Rold、Nkemakonam C. Okoye、Fabio A. Gallazzi、Charles L. Barnes、Cathy S. Cutler、Alan R. Ketring、Timothy J. Hoffman、Silvia S. Jurisson
DOI:10.1016/j.nucmedbio.2018.03.001
日期:2018.6
Introduction: Trithiol chelates are suitable for labeling radioarsenic (As-72: 2.49 MeV beta(+), 26 h;As- 77: 0.683 MeV beta(-), 38.8 h) to form potential theranostic radiopharmaceuticals for PET imaging and therapy. To investigate the in vivo stability of trithiol chelates complexed with no carrier added (nca) radioarsenic, a bifunctional trithiol chelate was developed, and conjugated to bombesin(7-14)NH2 as a model peptide.Methods: A trithiol-BBN(7-14)NH(2 )bioconjugate and its arsenic complex were synthesized and characterized. The trithiol-BBN(7-14)NH2 conjugate was radiolabeled with( 77)As, its in vitro stability assessed, and biodistribution studies were performed in CF-1 normal mice of free [As-77]arsenate and( 77)As-trithiol- BBN (7-14)NH2.Results: The trithiol-BBN(7-14)NH(2 )conjugate, its precursors and its As-trithiol-BBN(7-14)NH2 complex were fully characterized. Radiolabeling studies with nca(77)As resulted in over 90% radiochemical yield of( 77)As-trithiol-BBN, which was stable for over 48 h. Biodistribution studies were performed with both free [As-77]arsenate and Sep-Pak (R) purified( 77)As-trithiol-BBN(7-14)NH2. Compared to the fast renal clearance of free [As-77]arsenate,As-77-trithiol-BBN(7-14)NH2 demonstrated increased retention with clearance mainly through the hepatobiliary system, consistent with the lipophilicity of the( 77)As-trithiol-BBN(714)NH(2 )complex.Conclusion: The combined in vitro stability of As-77-trithiol-BBN(7-14)NH2 and the biodistribution results demonstrate its high in vivo stability, making the trithiol a promising platform for developing radioarsenic-based theranostic radiopharmaceuticals. (C) 2018 Elsevier Inc. All rights reserved.