Timing of captopril administration determines radiation protection or radiation sensitization in a murine model of total body irradiation.
Exp Hematol
; 38(4): 270-81, 2010 Apr.
Article
in En
| MEDLINE
| ID: mdl-20116413
ABSTRACT
OBJECTIVE:
Angiotensin II (Ang II), a potent vasoconstrictor, affects the growth and development of hematopoietic cells. Mixed findings have been reported for the effects of angiotensin-converting enzyme (ACE) inhibitors on radiation-induced injury to the hematopoietic system. We investigated the consequences of different regimens of the ACE inhibitor captopril on radiation-induced hematopoietic injury. MATERIALS ANDMETHODS:
C57BL/6 mice were either sham-irradiated or exposed to (60)Co total body irradiation (0.6 Gy/min). Captopril was provided in the water for different time periods relative to irradiation.RESULTS:
In untreated mice, the survival rate from 7.5 Gy was 50% at 30 days postirradiation. Captopril treatment for 7 days prior to irradiation resulted in radiosensitization with 100% lethality and a rapid decline in mature blood cells. In contrast, captopril treatment beginning 1 hour postirradiation and continuing for 30 days resulted in 100% survival, with improved recovery of mature blood cells and multilineage hematopoietic progenitors. In nonirradiated control mice, captopril biphasically modulated Lin(-) marrow progenitor cell cycling. After 2 days, captopril suppressed G(0)-G(1) transition and a greater number of cells entered a quiescent state. However, after 7 days of captopril treatment Lin(-) progenitor cell cycling increased compared to untreated control mice.CONCLUSION:
These findings suggest that ACE inhibition affects hematopoietic recovery following radiation by modulating the hematopoietic progenitor cell cycle. The timing of captopril treatment relative to radiation exposure differentially affects the viability and repopulation capacity of spared hematopoietic stem cells and, therefore, can result in either radiation protection or radiation sensitization.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Radiation Protection
/
Hematopoietic Stem Cells
/
Captopril
/
Whole-Body Irradiation
Type of study:
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
Exp Hematol
Year:
2010
Document type:
Article
Affiliation country:
United States