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Effects of fetal exposure to isoflurane on postnatal memory and learning in rats Huafeng Wei, MD, PhD Assistant Professor Department of Anesthesiology and Critical Care University of Pennsylvania. Financial Disclosure. Grant Support: March of Dimes Birth Defect Foundation - PowerPoint PPT Presentation
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Effects of fetal exposure to isoflurane on postnatal memory and learning in rats
Huafeng Wei, MD, PhDAssistant ProfessorDepartment of Anesthesiology and Critical CareUniversity of Pennsylvania
Financial Disclosure
Grant Support:Grant Support:
March of Dimes Birth Defect Foundation March of Dimes Birth Defect Foundation ( #12-FY05-62)( #12-FY05-62)
NIH NIGMS K08 073224-02NIH NIGMS K08 073224-02
Department of Anesthesiology andDepartment of Anesthesiology andCritical Care at University of PennsylvaniaCritical Care at University of PennsylvaniaE+D fundE+D fund
Is Isoflurane Neurotoxic to Fetus Developing Brain?
Isoflurane induced apoptosis dose-and time-Isoflurane induced apoptosis dose-and time-dependently in different neuronal cultures. dependently in different neuronal cultures.
Isoflurane induced apoptosis in the Isoflurane induced apoptosis in the developing brains of 7-day-old rat pups and developing brains of 7-day-old rat pups and subsequent memory and learning disability. subsequent memory and learning disability.
Isoflurane caused permanent memory loss, Isoflurane caused permanent memory loss, learning disability in aged rats.learning disability in aged rats.
Hypothesis: Isoflurane inhaled to pregnant Hypothesis: Isoflurane inhaled to pregnant mothers induced apoptosis in fetus mothers induced apoptosis in fetus developing brain and postnatal memory and developing brain and postnatal memory and learning disability.learning disability.
1.3% Isoflurane Inhibited Apoptosis in Fetus Hippocampus CA1 and Retrosplenial Cortex
Caspase-3 Density
Hippocampus CA1
2h 18h P50
50
100
150
200
250
300
350 Control1.3% Iso***
Hippocampus CA1
Ca
sp
as
e-3
Po
sit
ive
Ce
lls(P
er
mm
2)
2h 18h P50
5
10
15
20
25
30
35 Control1.3% Iso
***
Retrosplenial Cortex
Ca
sp
as
e-3
Po
sit
ive
Ce
lls(P
er
mm
2)
Retrosplenial Cortex
Isoflurane Improved Spatial Reference Memory In Juvenile But
Not Adult Rats
Probe Test, * Means P<0.05
P36 P1190
10
20
30
40
50
1.3% Iso
Control
**
##
Day of Test
*%
tim
e i
n p
rob
e q
ua
dra
nt
Summary 1.3% isoflurane for 6 hour in pregnant rats 1.3% isoflurane for 6 hour in pregnant rats
inhibited spontaneous apoptosis in fetus inhibited spontaneous apoptosis in fetus brain at 2 hour, but not at 18 hour or brain at 2 hour, but not at 18 hour or postnatal day 5 after treatment.postnatal day 5 after treatment.
1.3% isoflurane for 6 hour in pregnant rats 1.3% isoflurane for 6 hour in pregnant rats improved spatial reference memory in improved spatial reference memory in postnatal juvenile rats (P36), but not in postnatal juvenile rats (P36), but not in adult rats (P119). adult rats (P119).
1.3% isoflurane for 6 hour in pregnant rats 1.3% isoflurane for 6 hour in pregnant rats did not affect learning in postnatal rats.did not affect learning in postnatal rats.
Acknowledgement
University of PennsylvaniaUniversity of Pennsylvania
Grace Liang, Yujuan Li, Shouping Wang, Qiujun Wang, Wenlin Wei, Baobin Kang, Qing Cheng Meng
Roderic Eckenhoff, Randy Pittman, Roderic Eckenhoff, Randy Pittman, Maryellen EckenhoffMaryellen Eckenhoff