Related Experiment Video
Updated: Feb 21, 2026
Moderate Prenatal Alcohol Exposure and Quantification of Social Behavior in Adult Rats
Published on: December 14, 2014
Subsequent maternal separation exacerbates neurobehavioral abnormalities in rats neonatally exposed to sevoflurane
Jiaojiao Yang1, Lingsha Ju1, Min Jia2
1Zhongda Hospital, School of Medicine, Southeast University, Nanjing, China; Department of Anesthesiology, University of Florida College of Medicine, Gainesville, FL, United States; Department of Anesthesiology, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, China.
Insights
Neonatal exposure to sevoflurane may prime infant brains for later stress, potentially causing neurodevelopmental issues. Post-anesthesia stress exacerbates these problems, but bumetanide may offer therapeutic benefits by inhibiting NKCC1.
Area of Science:
- Neuroscience
- Anesthesiology
- Developmental Biology
Background:
- Conflicting human studies exist on whether short anesthesia in infants causes neurodevelopmental harm.
- Retrospective epidemiological studies suggest cognitive deficits in children with prior anesthesia exposure.
Purpose of the Study:
- To investigate if post-anesthesia stress exacerbates neurodevelopmental abnormalities initiated by sevoflurane in a rat model.
- To explore the role of gamma-aminobutyric acid type A receptor (GABAAR) activity in sevoflurane-induced developmental issues.
Main Methods:
- Postnatal day 6 (P6) rats were exposed to 60min of sevoflurane anesthesia.
- Maternal separation (180min) was used to simulate stress at P10.
- The NKCC1 inhibitor bumetanide was administered to assess its therapeutic potential.
Main Results:
- Sevoflurane exposure altered hypothalamic gene expression (decreased KCC2 mRNA, increased NKCC1/KCC2 ratio, increased CRH mRNA).
- Combined sevoflurane and maternal separation led to impaired performance in adult rats during the Morris water maze test.
- Bumetanide treatment ameliorated the neurodevelopmental abnormalities induced by sevoflurane and stress.
Conclusions:
- Neonatal sevoflurane exposure may sensitize rodents to later life stressors.
- Post-anesthetic stress can worsen neurodevelopmental abnormalities, even after brief sevoflurane exposure.
- Targeting NKCC1 activity may be a therapeutic strategy to prevent sevoflurane-induced neurodevelopmental deficits.
Abstract:
Several recent studies suggest that in the human population, a routine, short anesthetic in otherwise healthy infants is void of neurodevelopmental insult. On the other hand, many human retrospective epidemiological studies report evidence of cognitive abnormalities in children after testing those who had different anesthesia-requiring procedures in early childhood. We tested in a rat model whether post-anesthesia stressful environmental factors can contribute to developmental abnormalities that were initiated by a relatively short exposure to sevoflurane, the most widely used anesthetic in pediatric anesthesia, whose polyvalent actions include enhancement of gamma-aminobutyric acid type A receptor (GABAAR) activity. Postnatal day 6 (P6) male Sprague-Dawley rats were anesthetized with sevoflurane for 60min. To simulate subsequent stress, the animals were subjected to a single maternal separation for 180min at P10. To study the role of GABAAR-mediated depolarization, subgroups of P6 rats received a single injection of the Na+-K+-2Cl- (NKCC1) inhibitor, bumetanide, prior to initiation of anesthesia with sevoflurane. Rats that were exposed to sevoflurane had decreased hypothalamic K+-2Cl- (KCC2) mRNA level (F(2,13)=3.839, P=0.049), increased NKCC1/KCC2 mRNA ratio (F(2,13)=5.043, P=0.024) and increased corticotropin-releasing hormone (CRH) mRNA level (F(2,12)=9.450, P=0.003) at P10, the age at which maternal separation was imposed. Adult rats, neonatally exposed to a combination of sevoflurane and maternal separation, exhibited increases in the escape latencies greater than animals exposed to sevoflurane only (P=0.012), and only rats in the sevoflurane plus maternal separation group spent significantly less time in the target quadrant during the Morris water maze test (F(4,55)=4.856, P=0.002). Bumetanide ameliorated abnormalities induced by sevoflurane and a combination of sevoflurane plus maternal separation. Neonatal exposure to sevoflurane may sensitize to stressors later in life, and post-exposure stress may exacerbate neurodevelopmental abnormalities even after a relatively short exposure to sevoflurane in rodents. The NKCC1 downregulation prior to exposure to the anesthetic may be therapeutic.
