Technetium-99 m-PEGylated dendrimer-G2-(Dabcyle-Lys6,Phe7)-pHBSP: A novel Nano-Radiotracer for molecular and early detecting of cardiac ischemic region.

Abstract:

:In cardiac ischemic disorder, pyroglutamate helix B surface peptide (pHBSP) which derived from erythropoietin causes to increase cell stability. To improve the serum stability of pHBSP, two lipophilic amino acids Arg6, Ala7 were replaced with Fmoc-(Dabcyle)-Lys-OH and Fmoc-Phe-OH during the peptide synthesis. This peptide was subsequently conjugated to PEGylated dendrimer-G2 and labeled with 99mTcO4- to detect cardiac ischemic region. Radiochemical purity (RCP) of 99mTc-PEGylated dendrimer-G2-(Dabcyle-Lys6,Phe7)-pHBSP was evaluated by ITLC method. In addition, the radiopeptide was investigated for stability in human serum and binding affinity to hypoxic cells in myocardium H9c2 cell lines. Biodistribution and SPECT/CT scintigraphy were assessed in cardiac ischemic rats. Radiochemical yield indicated that the anionic dendrimer has a very high potential to complex formation with 99mTcO-4 (RCP > 94%) which was stable in human serum with RCP 89% up to 6 h. The binding of 99mTc- nanoconjugate to hypoxic cells was significantly more than normoxic cells (3-fold higher compared to normoxic cells at 1 h). In biodistribution studies, erythropoietin receptor-Beta common receptor (EPO-BcR)-positive uptake in the cardiac ischemic region was 3.62 ± 0.44% ID/g 30 min post injection. SPECT imaging showed a prominent uptake of 99mTc-nanoconjugate in EPO-BcR expressing ischemic heart.

journal_name

Bioorg Chem

journal_title

Bioorganic chemistry

authors

Mohtavinejad N,Amanlou M,Bitarafan-Rajabi A,Khalaj A,Pormohammad A,Ardestani MS

doi

10.1016/j.bioorg.2020.103731

subject

Has Abstract

pub_date

2020-05-01 00:00:00

pages

103731

eissn

0045-2068

issn

1090-2120

pii

S0045-2068(19)32136-4

journal_volume

98

pub_type

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