Purpose: The purpose of this study was to assess the early effects of microbeam irradiation on the vascular permeability and volume in the parietal cortex of normal nude mice using two-photon microscopy and immunohistochemistry. Methods and Materials: The upper part of the left hemisphere of 55 mice was irradiated anteroposteriorly using 18 vertically oriented beams (width 25 μm, interdistance 211 μm; peak entrance doses: 312 or 1000 Gy). At different times after microbeam exposure, the microvasculature in the cortex was analyzed using intravital two-photon microscopy after intravascular injection of fluorescein isothiocyanate (FITC)-dextrans and sulforhodamine B (SRB). Changes of the vascular volume were observed at the FITC wavelength over a maximum depth of 650 μm from the dura. The vascular permeability was detected as extravasations of SRB. Results: For all times (12 h to 1 month) after microbeam irradiation and for both doses, the FITC-dextran remained in the vessels. No significant change in vascular volume was observed between 12 h and 3 months after irradiation. Diffusion of SRB was observed in microbeam irradiated regions from 12 h until 12 days only after a 1000 Gy exposure. Conclusion: No radiation damage to the microvasculature was detected in normal brain tissue after a 312 Gy microbeam irradiation. This dose would be more appropriate than 1000 Gy for the treatment of brain tumors using crossfired microbeams. © 2006 Elsevier Inc.

Serduc, R., Verant, P., Vial, J., Farion, R., Rocas, L., Remy, C., et al. (2006). In vivo two-photon microscopy study of short-term effects of microbeam irradiation on normal mouse brain microvasculature. INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS, 64(5), 1519-1527 [10.1016/j.ijrobp.2005.11.047].

In vivo two-photon microscopy study of short-term effects of microbeam irradiation on normal mouse brain microvasculature

Bravin A
Membro del Collaboration Group
;
2006

Abstract

Purpose: The purpose of this study was to assess the early effects of microbeam irradiation on the vascular permeability and volume in the parietal cortex of normal nude mice using two-photon microscopy and immunohistochemistry. Methods and Materials: The upper part of the left hemisphere of 55 mice was irradiated anteroposteriorly using 18 vertically oriented beams (width 25 μm, interdistance 211 μm; peak entrance doses: 312 or 1000 Gy). At different times after microbeam exposure, the microvasculature in the cortex was analyzed using intravital two-photon microscopy after intravascular injection of fluorescein isothiocyanate (FITC)-dextrans and sulforhodamine B (SRB). Changes of the vascular volume were observed at the FITC wavelength over a maximum depth of 650 μm from the dura. The vascular permeability was detected as extravasations of SRB. Results: For all times (12 h to 1 month) after microbeam irradiation and for both doses, the FITC-dextran remained in the vessels. No significant change in vascular volume was observed between 12 h and 3 months after irradiation. Diffusion of SRB was observed in microbeam irradiated regions from 12 h until 12 days only after a 1000 Gy exposure. Conclusion: No radiation damage to the microvasculature was detected in normal brain tissue after a 312 Gy microbeam irradiation. This dose would be more appropriate than 1000 Gy for the treatment of brain tumors using crossfired microbeams. © 2006 Elsevier Inc.
Articolo in rivista - Articolo scientifico
Blood-brain barrier; Intravital multiphoton microscopy; Microbeam radiation therapy; Permeability; Synchrotron radiation X-rays; Vascular volume;
English
1519
1527
9
Serduc, R., Verant, P., Vial, J., Farion, R., Rocas, L., Remy, C., et al. (2006). In vivo two-photon microscopy study of short-term effects of microbeam irradiation on normal mouse brain microvasculature. INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS, 64(5), 1519-1527 [10.1016/j.ijrobp.2005.11.047].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/349196
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