Abstract
Introduction
The aim of this work was to map E-selectin expression in a traumatic brain injury model using a newly-designed MR contrast agent. Iron cores, responsible for susceptibility effects and therefore used as T2* contrast agents, need to be coated in order to be stabilized and need to be targeted to be useful.
Methods
We have designed a molecule coating composed, at one end, of bisphosphonate to ensure anchorage of the coating on the iron core and, at the other end, of Fukuda’s defined heptapeptide known to target selectin binding sites.
Conclusion
The synthesized nanoparticles were able to non-invasively target the traumatic brain lesion, inducing a specific T2* decrease of about 25% up to at least 70 min post-injection of the targeted contrast agent.
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Abbreviations
- IL1-β and TNF-α :
-
Interleukin-1-β and tumor necrosis factor-α
- IELLQAR:
-
Isoleucine-glutamate-leucine-leucine-glutamine-alanine-arginine heptapeptide
- BP:
-
Bisphosphonate
- 99mTc-BP:
-
Technetium chelated to bisphosphonate
- EG3:
-
Ethylene glycol block repeated three times
- Hd:
-
Hydrodynamic diameter
- ζ :
-
Zeta potential
- e:
-
Polyelectrolyte accessible layer depth
- d q :
-
Charge density (in C/m3)
- RARE:
-
Rapid acquisition with relaxation enhancement
- ADC:
-
Apparent diffusion coefficient
- 3DmGE:
-
3D multi-gradient echos sequence
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Chapon, C., Franconi, F., Lacoeuille, F. et al. Imaging E-selectin expression following traumatic brain injury in the rat using a targeted USPIO contrast agent. Magn Reson Mater Phy 22, 167–174 (2009). https://doi.org/10.1007/s10334-008-0161-z
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DOI: https://doi.org/10.1007/s10334-008-0161-z