Molecular imaging of fibrosis using a novel collagen-binding peptide labelled with 99mTc on SPECT/CT.

Abstract:

:Fibrosis, closely related to chronic various diseases, is a pathological process characterised by the accumulation of collagen (largely collagen type I). Non-invasive methods are necessary for the diagnosis and follow-up of fibrosis. This study aimed to develop a collagen-targeted probe for the molecular imaging of fibrosis. We identified CPKESCNLFVLKD (CBP1495) as an original collagen-binding peptide using isothermal titration calorimetry and enzyme-linked immunosorbent assay. CBP1495 effectively bound to collagen type I (K d = 861 nM) and (GPO)9 (K d = 633 nM), a collagen mimetic peptide. Western blot and histochemistry validated CBP1495 targeting collagen in vitro and ex vivo. (Gly-(D)-Ala-Gly-Gly) was introduced to CBP1495 for coupling 99mTc. Labelling efficiency of 99mTc-CBP1495 was 95.06 ± 1.08 %. The physico-chemical properties, tracer kinetics and biodistribution of 99mTc-CBP1495 were carried out, and showed that the peptide stably chelated 99mTc in vitro and in vivo. SPECT/CT imaging with 99mTc-CBP1495 was performed in rat fibrosis models, and revealed that 99mTc-CBP1495 significantly accumulated in fibrotic lungs or livers of rats. Finally, 99mTc-CBP1495 uptake and hydroxyproline (Hyp), a specific amino acid of collagen, were quantitatively analysed. The results demonstrated that 99mTc-CBP1495 uptake was positvely correlated with Hyp content in lungs (P < 0.0001, r 2 = 0.8266) or livers (P < 0.0001, r 2 = 0.7581). Therefore, CBP1495 is a novel collagen-binding peptide, and 99mTc-labelled CBP1495 may be a promising radiotracer for the molecular imaging of fibrosis.

journal_name

Amino Acids

journal_title

Amino acids

authors

Zheng L,Ding X,Liu K,Feng S,Tang B,Li Q,Huang D,Yang S

doi

10.1007/s00726-016-2328-7

subject

Has Abstract

pub_date

2017-01-01 00:00:00

pages

89-101

issue

1

eissn

0939-4451

issn

1438-2199

pii

10.1007/s00726-016-2328-7

journal_volume

49

pub_type

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