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Lower isoflurane concentration affects spatial learning and neurodegeneration in adult mice compared with higher concentrations.

Abstract：

BACKGROUND:Volatile anesthetics such as isoflurane are widely used in clinical and research contexts. Concerns have been raised that the effects of these drugs on the central nervous system may result in long-term impairment after surgery or general anesthesia. Hence, this study aimed to detect how different isoflurane concentrations influence spatial learning and cell death in adult mice. METHODS:Fifty-two C57BL/6 mice were randomly divided in four groups. Mice in three groups were exposed to different concentrations of isoflurane (1, 1.5, and 2%) for 1 h; the control group was not exposed to anesthesia. Five mice per group were killed 3 h after anesthesia to perform histopathologic and immunohistochemical analyses (hematoxylin-eosin staining; caspase-3 activation). Eight mice per group were used for behavioral tests (open field, T-maze spontaneous alternation, and water maze) on subsequent days. RESULTS:There were no differences between groups in the T-maze spontaneous alternation test or in the open field (no confounding effects of stress or locomotion). The group anesthetized with 1% isoflurane performed worse in the water maze task on day 1 (550.4 ±162.78 cm) compared with the control group (400.1 ± 112.88 cm), 1.5% isoflurane (351.9 ± 150.67 cm), and 2% isoflurane (364.5 ± 113.70 cm; P ≤ 0.05) and on day 3 (305.0 ± 81.75 cm) compared with control group (175.13 ± 77.00 cm) and 2% isoflurane (204.11 ± 85.75 cm; P ≤ 0.038). In the pyramidal cell layer of the region cornu ammonis 1 of the hippocampus, 1% isoflurane showed a tendency to cause more neurodegeneration (apoptosis) (61.4 ± 26.40, profiles/mm) than the group with 2% of isoflurane (20.6 ± 17.77, profiles/mm; P = 0.051). CONCLUSION:Low isoflurane concentration (1%) caused spatial learning impairment and more neurodegeneration compared with higher isoflurane concentrations. Results for mice receiving the latter concentrations were similar to those of control mice.

journal_name

Anesthesiology

journal_title

Anesthesiology

authors

Valentim AM,Di Giminiani P,Ribeiro PO,Rodrigues P,Olsson IA,Antunes LM

doi

10.1097/ALN.0b013e3181f79c7c

subject

Has Abstract

pub_date

2010-11-01 00:00:00

pages

1099-108

issue

eissn

0003-3022

issn

1528-1175

journal_volume

113

pub_type

杂志文章

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Lower isoflurane concentration affects spatial learning and neurodegeneration in adult mice compared with higher concentrations.