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Gender differences in long-term beneficial effects of erythropoietin given after neonatal stroke in postnatal day-7 rats.

Abstract：

:Recently, we reported that erythropoietin attenuates neonatal brain injury caused by focal cerebral ischemia. The long-term effects of erythropoietin on focal cerebral ischemia-induced injury to the developing brain and the potential gender differences in these long-term effects have not been studied in detail. The current study demonstrated a similarity in the mean infarct volume in both the vehicle-treated male and female rats at 6 and 12 weeks after focal cerebral ischemia. On the other hand, erythropoietin treatment (1000 U/kg x three doses after focal cerebral ischemia) caused a significant reduction in the mean infarct volume in both males and females at 6 weeks after focal cerebral ischemia when compared with the corresponding vehicle-treated animals (males: 141.4+/-48.2 mm3 vs. 194.0+/-59.2 mm3, P<0.05; females: 85.4+/-31.6 mm3 vs. 183.4+/-46.3 mm3, P<0.05). Interestingly, the reduction in the mean infarct volume in the erythropoietin-treated males was significantly less than that in the erythropoietin-treated females at 6 weeks after focal cerebral ischemia (141.4+/-48.2 mm3 vs. 85.4+/-31.6 mm3, P<0.05). At 12 weeks after focal cerebral ischemia, the mean infarct volume in the erythropoietin-treated males significantly increased to 181.0+/-50.4 mm3 (P<0.05). In contrast, the mean infarct volume in the erythropoietin-treated females remained stable (87.0+/-41.7 mm3). Additionally, erythropoietin treatment significantly improved sensorimotor function recovery with a misstep number similar to the sham-operation group at 6 and 12 weeks after focal cerebral ischemia. Moreover, the mean number of missteps in the erythropoietin-treated females was less than that in males at 6 (13.5+/-2.0 vs. 24.5+/-2.5, P<0.05) and 12 (12.5+/-2.0 vs. 20.0+/-2.0, P<0.05) weeks after focal cerebral ischemia. These results indicate that erythropoietin administration after focal cerebral ischemia produces a significant long-term neuroprotective benefit on the developing brain, and that this effect is more beneficial in the female rats.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Wen TC,Rogido M,Peng H,Genetta T,Moore J,Sola A

doi

10.1016/j.neuroscience.2006.02.057

keywords:

subject

Has Abstract

pub_date

2006-01-01 00:00:00

pages

803-11

issue

3

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(06)00310-1

journal_volume

139

pub_type

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