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Titolo:
Slow IPSC kinetics, low levels of alpha 1 subunit expression and paired-pulse depression are distinct properties of neonatal inhibitory GABAergic synaptic connections in the mouse superior colliculus
Autore:
Juttner, R; Meier, J; Grantyn, R;
Indirizzi:
Humboldt Univ, Med Sch Charite, Johannes Muller Inst Physiol, D-10117 Berlin, Germany Humboldt Univ Berlin Germany D-10117 st Physiol, D-10117 Berlin, Germany
Titolo Testata:
EUROPEAN JOURNAL OF NEUROSCIENCE
fascicolo: 11, volume: 13, anno: 2001,
pagine: 2088 - 2098
SICI:
0953-816X(200106)13:11<2088:SIKLLO>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
RECEPTOR-MEDIATED INHIBITION; SHORT-TERM PLASTICITY; NEURONS IN-VITRO; MOLECULAR CHARACTERIZATION; RELEASE PROBABILITY; GABA(A) RECEPTORS; CENTRAL SYNAPSES; GRANULE CELLS; DENTATE GYRUS; RAT;
Keywords:
GABA(A) receptor; IPSC fluctuations; PCR; synapse development; synaptic transmission;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
55
Recensione:
Indirizzi per estratti:
Indirizzo: Grantyn, R Humboldt Univ, Med Sch Charite, Johannes Muller Inst Physiol, Tucholskystr2, D-10117 Berlin, Germany Humboldt Univ Tucholskystr 2 Berlin Germany D-10117 n, Germany
Citazione:
R. Juttner et al., "Slow IPSC kinetics, low levels of alpha 1 subunit expression and paired-pulse depression are distinct properties of neonatal inhibitory GABAergic synaptic connections in the mouse superior colliculus", EUR J NEURO, 13(11), 2001, pp. 2088-2098

Abstract

Remodelling of visual maps in the superior colliculus (SC) depends on neuronal activity. Synaptic inhibition could contribute to this process becausespontaneous spike discharge in the SC was modulated by GABA(A) receptor activation at postnatal days (P) 1-3. To investigate the functional capacity of GABAergic synaptic transmission at this early stage of development, whole-cell patch-clamp recordings were made from wide field neurons (WFNs) in horizontal slices comprising the superficial grey layer of the SC. Focal stimulation in the vicinity of WFNs evoked tetrodotoxin-sensitive stimulus-locked inhibitory postsynaptic currents (eIPSCs). The failure rate of eIPSCs was low (approximate to 0.2), and the maximal amplitude of evoked unitary eIPSCs exceeded the amplitude of average miniature IPSCs (mIPSCs) by a factorof 4-5, suggesting that action potential-mediated GABA release was more effective than spontaneous release. Some of the properties of GABAergjc synaptic transmission in the neonatal SC were age-specific. In contrast with eIPSCs in the more mature SC at P20-22, neonatal eIPSCs decayed more slowly, preferentially fluctuated in duration, not amplitude, and mostly lacked temporal summation, due to depression at shorter intervals. The paired-pulse ratio (eIPSC(2):eIPSC(1)) was inversely related to the duration of eIPSCs. PCR analysis showed, in addition, that the ratio of alpha1: alpha3 subunit expression was lower in the neonatal SC. Together, these results suggest that, at a young age, efficacy of GABAergic synaptic transmission is primarily constrained by the slow kinetics and the saturation of postsynaptic GABA(A)receptors.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 13:29:26