Abstract
Purpose
This article characterizes the vascular effects following vascular-targeted photodynamic therapy with a photosensitizer which actively targets endothelial cells.
Methods
This strategy was considered by coupling a chlorin to a heptapeptide targeting neuropilin-1 in human malignant glioma-bearing nude mice. A laser Doppler microvascular perfusion monitor was used to monitor microvascular blood perfusion in tumor tissue. Endothelial cells’ ultra structural integrity was observed by transmission electron microscopy. The consequences of photosensitization on tumor vessels, tissue factor expression, fibrinogen consumption, and thrombogenic effects were studied by immunohistochemical staining.
Results
Treatment of glioma-bearing mice with the conjugate showed a statistically significant tumor growth delay. Vascular effect was characterized by a decrease in tumor tissue blood flow at about 50% baseline during treatment not related to variations in temperature. This vascular shutdown was mediated by tumor blood vessels’ congestion. A pro-thrombotic behavior of targeted endothelial cells in the absence of ultra structural changes led to the induction of tissue factor expression from the earliest times post-treatment. Expression of tissue factor-initiated thrombi formation was also related to an increase in fibrinogen consumption.
Conclusion
Using a peptide-conjugated photosensitizer targeting neuropilin-1, induction of tissue factor expression immediately post-treatment, led to the establishment of thrombogenic effects within the vessel lumen.
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Abbreviations
- Ahx:
-
6-aminohexanoic acid
- a.i.:
-
arbitrary intensity
- ATWLPPR:
-
H-Ala-Thr-Trp-Leu-Pro-Pro-Arg-OH
- asHTF:
-
alternatively spiced human tissue factor
- a.u.:
-
arbitrary units
- BPD-MA:
-
benzoporphyrin derivative monoacid ring
- BSA:
-
bovine serum albumine
- DLI:
-
drug-light interval
- FITC:
-
fluoresceine iso thio cyanate
- HES:
-
hematoxylin, eosin and safran
- HRP:
-
streptavidin-horseradish peroxidase
- IL-6:
-
interleukin-6
- i.v.:
-
intravenous
- NRP-1:
-
neuropilin-1
- PBS:
-
phosphate-buffered saline
- PDT:
-
photodynamic therapy
- PEG:
-
polyethylene glycol
- PO2 :
-
oxygen pressure
- ROS:
-
reactive oxygen species
- RSM:
-
response surface methodology
- s.d.:
-
standard deviation
- TEM:
-
transmission electron microscopy
- TEM buffer:
-
Tris EDTA molybdate buffer
- TF:
-
tissue factor
- TGD:
-
tumor growth delay
- TNF-α:
-
tumor necrosis factor alpha
- TPC:
-
5-(4-carboxyphenyl)-10,15,20-triphenylchlorin
- V:
-
volume
- VEGF:
-
vascular endothelial growth factor
- VTP:
-
vascular targeted photodynamic therapy
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ACKNOWLEDGEMENTS
The authors would like to thank Denise Thiébaut, Marie Rouyer, and Carole Ramacci for their excellent technical assistance. We also thank Sophie Pinel and Anne-Sophie Chrétien for their collaboration. This work was supported by the research funds of the French “Ligue Nationale Contre le Cancer, Comités Lorrains.”
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Loraine Tirand and Béatrice Faivre contributed equally to this study.
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Bechet, D., Tirand, L., Faivre, B. et al. Neuropilin-1 Targeting Photosensitization-Induced Early Stages of Thrombosis via Tissue Factor Release. Pharm Res 27, 468–479 (2010). https://doi.org/10.1007/s11095-009-0035-8
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DOI: https://doi.org/10.1007/s11095-009-0035-8