Early Blood-brain Barrier Disruption After High-dose Single-fraction Irradiation in Rats

Overview

Journal Acta Neurochir (Wien)

Specialty Neurosurgery

Date 1995 Jan 1

PMID 8748832

Citations 18

Authors

H Nakata

T Yoshimine

A Murasawa

E Kumura

K Harada

Y Ushio

T Hayakawa

Affiliations

Soon will be listed here.

Abstract

We studied the effect of high-dose single-fraction irradiation on the permeability of the blood-brain barrier (BBB) in rat brains. Immunohistochemistry with an antibody to serum albumin was used as a sensitive method for detecting the extravasation of endogenous serum components. Extravasation of albumin was detected as early as 1 day after irradiation with 20 or 40 Gy. Immunoreactivity reached its maximum after 3 days, gradually decreased during the following few weeks and had disappeared by day 30. Extravasation was much greater after irradiation with 80 Gy and continued to increase during the whole period of the experiment (6 days). Disruption of BBB this early after irradiation has not been previously documented. The time course of observed serum albumin extravasation, however, agrees well with the previous ultrastructural evidence for increased BBB permeability after irradiation with 27 Gy in monkey brains. This transient impairment of BBB may contribute to the reversible neurological symptoms after radiosurgery. It may also allow drugs that normally not pass the BBB to do so and thus disperse in the brain when administered at this time.

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