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The radioprotective effect of alpha2-macroglobulin: a morphological study of rat liver
Mirjana Mihailović1, Verica Milosević, Ilijana Grigorov
1Department of Molecular Biology, Institute for Biological Research, Belgrade, Serbia.
Background:
Administration of the acute-phase protein alpha2-macroglobulin (MG) prior to total-body irradiation of rats with a 6.7 Gy (LD50) dose of X-rays exerts a radioprotective effect.
Material/Methods:
MG was administered 30 min before irradiation with a 6.7 Gy (LD50) dose of X-rays. Its radioprotective efficacy was compared with that of the synthetic agent amifostine (WR-2721), a sulfhydryl compound which is currently the most effective radioprotector in clinical use. After administration of either MG or amifostine, changes in body and liver weight were recorded and histological liver sections were examined during a four-week follow-up period.
Results:
As observed in the experimental group administered amifostine, rats that received MG prior to irradiation exhibited 100% survival and restoration of the body and liver weight to the control values. The morphological damage seen in the liver after irradiation of untreated rats was absent in both the MG- and amifostine-pretreated rats. Also, hepatocytes and granulated cells had prominent nuclei and did not exhibit major changes in volume. Dilation of the central vein was not observed.
Conclusions:
Administration of MG before irradiation, similar to pretreatment with amifostine, provided complete survival of experimental rats and recovery of liver weight and preserved major histological parameters of the liver.
Insights
Alpha2-macroglobulin (MG) provides significant radioprotection against lethal X-ray doses. This acute-phase protein ensures complete survival and preserves liver health, similar to amifostine.
Area of Science:
- Radioprotection research
- Biomedical science
- Radiation biology
Background:
- The acute-phase protein alpha2-macroglobulin (MG) demonstrates radioprotective properties.
- Lethal doses of X-ray irradiation pose significant health risks.
Purpose of the Study:
- To evaluate the radioprotective efficacy of alpha2-macroglobulin (MG).
- To compare MG's effectiveness against amifostine, a known radioprotector.
Main Methods:
- MG was administered 30 minutes before 6.7 Gy X-ray irradiation (LD50 dose) in rats.
- Radioprotective effects were assessed by comparing survival rates, body/liver weight changes, and liver histology with amifostine treatment and controls.
Main Results:
- Rats pretreated with MG showed 100% survival, comparable to amifostine.
- MG administration prevented irradiation-induced liver damage, maintaining normal organ weight and histological integrity.
- Hepatocytes and granulated cells in MG-treated rats exhibited healthy morphology without significant volume changes or central vein dilation.
Conclusions:
- Alpha2-macroglobulin (MG) offers complete radioprotection against lethal X-ray doses.
- MG effectively preserves liver function and structure post-irradiation, mirroring the protective effects of amifostine.
