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Cardiac Targeting Peptide, a Novel Cardiac Vector: Studies in Bio-Distribution, Imaging Application, and Mechanism of Transduction

Zahid, Maliha and Feldman, Kyle and Garcia-Borrero, Gabriel and Feinstein, Timothy and Pogodzinski, Nicholas and Xu, Xinxiu and Yurko, Raymond and Czachowski, Michael and Wu, Yijen and Mason, Neale and Lo, Cecilia (2018) Cardiac Targeting Peptide, a Novel Cardiac Vector: Studies in Bio-Distribution, Imaging Application, and Mechanism of Transduction. Biomolecules, 8 (4). p. 147. ISSN 2218-273X

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Our previous work identified a 12-amino acid peptide that targets the heart, termed cardiac targeting peptide (CTP). We now quantitatively assess the bio-distribution of CTP, show a clinical application with the imaging of the murine heart, and study its mechanisms of transduction. Bio-distribution studies of cyanine5.5-N-Hydroxysuccinimide (Cy5.5) labeled CTP were undertaken in wild-type mice. Cardiac targeting peptide was labeled with Technetium 99m (99mTc) using the chelator hydrazino-nicotinamide (HYNIC), and imaging performed using micro-single photon emission computerized tomography/computerized tomography (SPECT/CT). Human-induced pluripotent stem cell (iPSC)-derived cardiomyocytes (CMCs) were incubated with dual-labeled CTP, and imaged using confocal microscopy. TriCEPs technology was utilized to study the mechanism of transduction. Bio-distribution studies showed peak uptake of CTP at 15 min. 99mTc-HYNIC-CTP showed heart-specific uptake. Robust transduction of beating human iPSC-derived CMCs was seen. TriCEPs experiments revealed five candidate binding partners for CTP, with Kcnh5 being felt to be the most likely candidate as it showed a trend towards being competed out by siRNA knockdown. Transduction efficiency was enhanced by increasing extracellular potassium concentration, and with Quinidine, a Kcnh5 inhibitor, that blocks the channel in an open position. We demonstrate that CTP transduces the normal heart as early as 15 min. 99mTc-HYNIC-CTP targets the normal murine heart with substantially improved targeting compared with 99mTc Sestamibi. Cardiac targeting peptide’s transduction ability is not species limited and has human applicability. Cardiac targeting peptide appears to utilize Kcnh5 to gain cell entry, a phenomenon that is affected by pre-treatment with Quinidine and changes in potassium levels.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Zahid, Malihamaz7@pitt.edumaz7
Feldman, Kyle
Garcia-Borrero, Gabriel
Feinstein, Timothytnf8@pitt.edutnf8
Pogodzinski, Nicholas
Xu, Xinxiuxux@pitt.eduxux
Yurko, Raymondyurko@pitt.eduyurko
Czachowski, Michael
Wu, Yijen
Mason, Neale
Lo, Ceciliacel36@pitt.educel36
Date: 14 November 2018
Date Type: Publication
Journal or Publication Title: Biomolecules
Volume: 8
Number: 4
Publisher: MDPI AG
Page Range: p. 147
DOI or Unique Handle: 10.3390/biom8040147
Schools and Programs: School of Medicine > Developmental Biology
Refereed: Yes
Uncontrolled Keywords: cardiac targeting peptide, cell penetrating peptides, protein transduction domains, mechanism of transduction, bio-distribution, SPECT imaging
ISSN: 2218-273X
Official URL:
Funders: American Heart Association Scientist Development Award, Pitt Innovation Challenge
Article Type: Research Article
Date Deposited: 26 May 2021 16:31
Last Modified: 26 May 2021 16:31


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