Peptide targeted tripod macrocyclic Gd(III) chelates for cancer molecular MRI.

Abstract:

:Rational design and develop of targeted contrast agents binding to cancer-related proteins will achieve more accurate cancer diagnosis and prognosis by magnetic resonance (MR) imaging. CREKA is a tumor-homing pentapeptide (Cys-Arg-Glu-Lys-Ala) specifically homes to fibrin-fibronectin complexes abundantly expressed in tumor microenvironment. In this study, we developed and evaluated a CREKA peptide targeted multiplexed Gd-MR probe (CREKA-Tris-Gd(DOTA)3) for MR imaging of breast tumors. CREKA and azide bearing Gd(III) was attached to a maleimide-functional trialkyne scaffold via thiol-maleimide and azide-alkyne click chemistry, respectively. CREKA-Tris-Gd(DOTA)3 has a well-defined structure with a molecular weight of 2914 Da. The T1 relaxivity of CREKA-Tris-Gd(DOTA)3 is 8.06 mM(-1) s(-1) per Gd (24.18 mM(-1) s(-1) per molecule) at room temperature and 3 T. Fluorescence imaging showed high binding specificity of CREKA to a 4T1 breast tumor model in mice while it was not found for the scrambled CREKA (CERAK). The CREKA peptide-targeted contrast agent resulted in greater contrast enhancement than the corresponding CERAK agent and the commercialized contrast agent ProHance(®) in tumor at a dose of 0.1 mmol Gd/kg in female athymic mice bearing 4T1 breast carcinoma xenograft. This small molecular contrast agent was easily excreted from body after imaging indicated low toxicity. The targeted MRI contrast agent has a potential for specific cancer molecular imaging with MRI.

journal_name

Biomaterials

journal_title

Biomaterials

authors

Zhou Z,Wu X,Kresak A,Griswold M,Lu ZR

doi

10.1016/j.biomaterials.2013.06.057

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

7683-93

issue

31

eissn

0142-9612

issn

1878-5905

pii

S0142-9612(13)00772-2

journal_volume

34

pub_type

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