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Neonatal exposure to a combination of N-Methyl-D-aspartate and γ-aminobutyric acid type A receptor anesthetic agents potentiates apoptotic neurodegeneration and persistent behavioral deficits
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för neurovetenskap, Psykiatri, Ulleråker, Akademiska sjukhuset.
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper.
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper. (Anaesthesiology and Intensive Care)
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för fysiologi och utvecklingsbiologi.
2007 (Engelska)Ingår i: Anesthesiology, ISSN 0003-3022, E-ISSN 1528-1175, Vol. 107, nr 3, s. 427-436Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Background: During the brain growth spurt, the brain develops and modifies rapidly. In rodents this period is neonatal, spanning the first weeks of life, whereas in humans it begins during the third trimester and continues 2 yr. This study examined whether different anesthetic agents, alone and in combination, administered to neonate mice, can trigger apoptosis and whether behavioral deficits occur later in adulthood.

Methods: Ten-day-old mice were injected subcutaneously with ketamine (25 mg/kg), thiopental (5 mg/kg or 25 mg/kg), propofol (10 mg/kg or 60 mg/kg), a combination of ketamine (25 mg/kg) and thiopental (5 mg/kg), a combination of ketamine (25 mg/kg) and propofol (10 mg/kg), or control (saline). Fluoro-Jade staining revealed neurodegeneration 24 h after treatment. The behavioral tests-spontaneous behavior, radial arm maze, and elevated plus maze (before and after anxiolytic)-were conducted on mice aged 55-70 days.

Results: Coadministration of ketamine plus propofol or ketamine plus thiopental or a high dose of propofol alone significantly triggered apoptosis. Mice exposed to a combination of anesthetic agents or ketamine alone displayed disrupted spontaneous activity and learning. The anxiolytic action of diazepam was less effective when given to adult mice that were neonatally exposed to propofol.

Conclusion: This study shows that both a γ-aminobutyric acid type A agonist (thiopental or propofol) and an N-methyl-d-aspartate antagonist (ketamine) during a critical stage of brain development potentiated neonatal brain cell death and resulted in functional deficits in adulthood. The use of thiopental, propofol, and ketamine individually elicited no or only minor changes.

Ort, förlag, år, upplaga, sidor
2007. Vol. 107, nr 3, s. 427-436
Nationell ämneskategori
Medicin och hälsovetenskap
Identifikatorer
URN: urn:nbn:se:uu:diva-11526DOI: 10.1097/01.anes.0000278892.62305.9cISI: 000249297200011PubMedID: 17721245OAI: oai:DiVA.org:uu-11526DiVA, id: diva2:39295
Tillgänglig från: 2008-05-15 Skapad: 2008-05-15 Senast uppdaterad: 2017-12-11Bibliografiskt granskad
Ingår i avhandling
1. Neonatal Exposure to Anaesthesia and Adjuvants: Acute Effects on Cerebral Apoptosis and Neuroproteins, and Late  Behavioural Aberrations in Mice
Öppna denna publikation i ny flik eller fönster >>Neonatal Exposure to Anaesthesia and Adjuvants: Acute Effects on Cerebral Apoptosis and Neuroproteins, and Late  Behavioural Aberrations in Mice
2012 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

During a finite developmental phase – the brain growth spurt – the brain grows and matures at an accelerated rate. During this period the brain is more sensitive to harmful substances such as ethanol and environmental toxins than before or after. This period extends from the last trimester to the second year in humans and occurs postnatally in the mice used for these studies.

The aims of this thesis were; to investigate common anaesthetics ability to promote acute apoptosis and late persistant behavioural aberrations measured with spontaneous behaviour in a novel home environment, learning in a radial arm maze and anxiety-like behaviour in an elevated plus maze, to measure alterations in BDNF, CaMKII, GAP-43, synaptophysin and tau after anaesthesia exposure, to evaluate clonidine as a potentially protecting agent and examine if theophylline, a chemically unrelated compound, causes similar effects as anaesthetics.

Some of the results are: combinations of anaesthetics acting on the GABAA receptor (propofol or pentothal) and NMDA receptor (ketamine) exhibit more apoptosis and behavioural alterations than single anaesthetics. Ketamine, but not propofol, alters the content of CaMKII and GAP-43 proteins important in brain development. Propofol exposure alters the content of BDNF (brain derived neurotrophic factor) in hippocampus, frontal and parietal cortex. Neonatal propofol exposure leads to less sensitiveness to diazepam in adult age as measured with induced spontaneous behaviour and an elevated plus maze. Clonidine, an alpha2 adrenergic agonist does not cause any aberrations and appears to prevent apoptosis and behavioural alterations after ketamine. Theophylline, used as apnoea treatment in neonates, also increases apoptosis and alters normal behaviour.

Thus, alterations both in neuronal survival, function and protein expression is apparent after neonatal exposure to anaesthetics. This is also shown in studies of Rhesus monkeys. However, it is still difficult to assess how these findings should extrapolate to humans. Epidemiological studies give conflicting results.

Insufficient anaesthesia is not a solution as pain and stress cause even more pronounced problems. Minimizing anaesthetic exposure, delaying procedures until after the sensitive phase and finding protective agents, such as clonidine, are possible strategies. Evaluation of other substances that infants are exposed to is needed.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2012. s. 54
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 1651-6206 ; 784
Nyckelord
anaesthesia, neonatal, apoptosis, bahaviour, clonidine, ketamine, propofol, theophyllamine
Nationell ämneskategori
Anestesi och intensivvård
Forskningsämne
Medicin
Identifikatorer
urn:nbn:se:uu:diva-173401 (URN)978-91-554-8395-1 (ISBN)
Disputation
2012-08-24, Hedstrandsalen, Akademiska Sjukhuset, Ing 70 bv, Uppsala, 13:15 (Svenska)
Opponent
Handledare
Tillgänglig från: 2012-06-01 Skapad: 2012-04-23 Senast uppdaterad: 2013-04-03

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