TY - JOUR
T1 - GABAA-benzodiazepine receptor complex sensitivity in 5-HT1A receptor knockout mice on a 129/Sv background
AU - Pattij, Tommy
AU - Groenink, Lucianne
AU - Oosting, Ronald S.
AU - Van der Gugten, Jan
AU - Maes, Robert A.A.
AU - Olivier, Berend
PY - 2002
Y1 - 2002
N2 - Previous studies in 5-HT1A receptor knockout (1AKO) mice on a mixed Swiss Webster×129/Sv (SW×129/Sv) and a pure 129/Sv genetic background suggest a differential γ-aminobutyric acid (GABAA)-benzodiazepine receptor complex sensitivity in both strains, independent from the anxious phenotype. To further investigate these discrepancies, various GABAA-benzodiazepine receptor ligands were tested in different behavioral paradigms in 1AKO and wild type (WT) mice on a 129/Sv background. 1AKO and WT mice responded comparably to alprazolam, flumazenil, alcohol and pentylenetetrazol as measured in the stress-induced hyperthermia paradigm. In addition, sedative-anesthetic effects of pentobarbital measured via the righting reflex were similar and a selected dose of diazepam exerted similar anxiolytic effects in both genotypes in the elevated plus maze. In conclusion, 1AKO mice on a 129/Sv background have undisturbed GABAA-benzodiazepine receptor sensitivity in contrast to those described on a mixed Swiss Webster×129/Sv background. The anxious phenotype of 1AKO mice seems to occur independent of the GABAA-benzodiazepine receptor complex functioning.
AB - Previous studies in 5-HT1A receptor knockout (1AKO) mice on a mixed Swiss Webster×129/Sv (SW×129/Sv) and a pure 129/Sv genetic background suggest a differential γ-aminobutyric acid (GABAA)-benzodiazepine receptor complex sensitivity in both strains, independent from the anxious phenotype. To further investigate these discrepancies, various GABAA-benzodiazepine receptor ligands were tested in different behavioral paradigms in 1AKO and wild type (WT) mice on a 129/Sv background. 1AKO and WT mice responded comparably to alprazolam, flumazenil, alcohol and pentylenetetrazol as measured in the stress-induced hyperthermia paradigm. In addition, sedative-anesthetic effects of pentobarbital measured via the righting reflex were similar and a selected dose of diazepam exerted similar anxiolytic effects in both genotypes in the elevated plus maze. In conclusion, 1AKO mice on a 129/Sv background have undisturbed GABAA-benzodiazepine receptor sensitivity in contrast to those described on a mixed Swiss Webster×129/Sv background. The anxious phenotype of 1AKO mice seems to occur independent of the GABAA-benzodiazepine receptor complex functioning.
KW - (In vivo)
KW - 5-HT receptor knockout mice
KW - GABA-benzodiazepine receptor
KW - Pentylenetetrazol
KW - Positive righting reflex
KW - Stress-induced hyperthermia
UR - http://www.scopus.com/inward/record.url?scp=0037188752&partnerID=8YFLogxK
U2 - https://doi.org/10.1016/S0014-2999(02)01893-9
DO - https://doi.org/10.1016/S0014-2999(02)01893-9
M3 - Article
C2 - 12106804
SN - 0014-2999
VL - 447
SP - 67
EP - 74
JO - European journal of pharmacology
JF - European journal of pharmacology
IS - 1
M1 - 60594
ER -