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Captopril modulates hypoxia-inducible factors and erythropoietin responses in a murine model of total body irradiation.

Abstract：

OBJECTIVE:Our laboratory reported that the angiotensin converting enzyme inhibitor captopril improves erythroid recovery from total body irradiation (TBI) in mice when administered after irradiation. However, captopril administered before TBI attenuates erythroid recovery. Here we investigate captopril and radiation regulation of erythropoietin (EPO) and thrombopoietin (TPO), key effectors of erythroid progenitor proliferation and differentiation. MATERIALS AND METHODS:C57BL/6 mice, nonirradiated or exposed to 7.5 Gy TBI ((60)Co, 0.6 Gy/min) were untreated or administered captopril. Plasma EPO and TPO levels were measured by enzyme-linked immunosorbent assay. Gene expression of EPO was determined by quantitative reverse transcription polymerase chain reaction. The hypoxia-inducible factors (HIF)-1α and -2α were measured by immunoblotting. RESULTS:In nonirradiated mice, continuous captopril administration in the water transiently reduced reticulocytes and red blood cells after 7 and 10 days, respectively. EPO plasma levels and gene expression were reduced below detectable limits after 2 days of captopril treatment, but recovered within 7 days. HIF-1α and HIF-2α were activated preceding reticulocyte and red blood cell recovery. TBI, which ablates early and late-stage erythroid progenitors, activated both HIFs and increased EPO and TPO. Captopril treatment postirradiation suppressed radiation-induced HIF activation and EPO expression. In contrast, captopril administration for 7 days before TBI resulted in earlier EPO induction and activation. Captopril treatment lowered TPO levels in nonirradiated mice, but had minimal effects on radiation-induced TPO. CONCLUSIONS:In nonirradiated mice, captopril biphasically regulates EPO via HIF activation. TBI ablates erythroid progenitors, resulting in hypoxia, HIF activation, and increased EPO expression that are modulated by captopril treatment. These data suggest that short-term suppression of radiation-induced EPO immediately after TBI is favorable for erythroid recovery.

journal_name

Exp Hematol

journal_title

Experimental hematology

authors

Barshishat-Kupper M,Mungunsukh O,Tipton AJ,McCart EA,Panganiban RA,Davis TA,Landauer MR,Day RM

doi

10.1016/j.exphem.2010.12.002

subject

Has Abstract

pub_date

2011-03-01 00:00:00

pages

293-304

issue

eissn

0301-472X

issn

1873-2399

pii

S0301-472X(10)00597-7

journal_volume

pub_type

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Captopril modulates hypoxia-inducible factors and erythropoietin responses in a murine model of total body irradiation.