Enzymatic single-chain antibody tagging: a universal approach to targeted molecular imaging and cell homing in cardiovascular disease

Ta, H. T., Prabhu, S., Leitner, E., Jia, F., von Elverfeldt, D., Jackson, K. E., Heidt, T., Nair, A. K. N., Pearce, H., von zur Muhlen, C., Wang, X., Peter, K. and Hagemeyer, C. E. (2011) Enzymatic single-chain antibody tagging: a universal approach to targeted molecular imaging and cell homing in cardiovascular disease. Circulation Research, 109 4: 365-373. doi:10.1161/CIRCRESAHA.111.249375


Author Ta, H. T.
Prabhu, S.
Leitner, E.
Jia, F.
von Elverfeldt, D.
Jackson, K. E.
Heidt, T.
Nair, A. K. N.
Pearce, H.
von zur Muhlen, C.
Wang, X.
Peter, K.
Hagemeyer, C. E.
Title Enzymatic single-chain antibody tagging: a universal approach to targeted molecular imaging and cell homing in cardiovascular disease
Journal name Circulation Research   Check publisher's open access policy
ISSN 0009-7330
1524-4571
Publication date 2011-08-05
Sub-type Article (original research)
DOI 10.1161/CIRCRESAHA.111.249375
Volume 109
Issue 4
Start page 365
End page 373
Total pages 9
Place of publication Baltimore, MD, United States
Publisher Lippincott Williams & Wilkins
Language eng
Formatted abstract
Rationale: Antibody-targeted delivery of imaging agents can enhance the sensitivity and accuracy of current imaging techniques. Similarly, homing of effector cells to disease sites increases the efficacy of regenerative cell therapy while reducing the number of cells required. Currently, targeting can be achieved via chemical conjugation to specific antibodies, which typically results in the loss of antibody functionality and in severe cell damage. An ideal conjugation technique should ensure retention of antigen-binding activity and functionality of the targeted biological component.

Objective: To develop a biochemically robust, highly reproducible, and site-specific coupling method using the Staphylococcus aureus sortase A enzyme for the conjugation of a single-chain antibody (scFv) to nanoparticles and cells for molecular imaging and cell homing in cardiovascular diseases. This scFv specifically binds to activated platelets, which play a pivotal role in thrombosis, atherosclerosis, and inflammation.

Methods and Results: The conjugation procedure involves chemical and enzyme-mediated coupling steps. The scFv was successfully conjugated to iron oxide particles (contrast agents for magnetic resonance imaging) and to model cells. Conjugation efficiency ranged between 50% and 70%, and bioactivity of the scFv after coupling was preserved. The targeting of scFv-coupled cells and nanoparticles to activated platelets was strong and specific as demonstrated in in vitro static adhesion assays, in a flow chamber system, in mouse intravital microscopy, and in in vivo magnetic resonance imaging of mouse carotid arteries.

Conclusions: This unique biotechnological approach provides a versatile and broadly applicable tool for procuring targeted regenerative cell therapy and targeted molecular imaging in cardiovascular and inflammatory diseases and beyond. 
Keyword Antibodies
Cell therapy
Molecular imaging
Platelets
Sortase A
Targeted molecular therapy
Thrombosis
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Australian Institute for Bioengineering and Nanotechnology Publications
 
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