Perineuronal 网在老鼠在批评时期期间增加禁止的 GABAergic 水流

• 作者: Hai-Wei Xu Hui Liu Jun-Ping Yao Ming-Ming Liu Peng-Fen Gao Tao Yu Zheng-Qin Yin
• 来源期刊: 国际眼科杂志：英文版
• 学科: 医学
• 关键词: gamma-aminobutyricacidreceptor plasticity visual cortex development POSTSYNAPTIC currents CHONDROITINASE ABC CHONDROITIN sulfate PROTEOGLYCANS WHOLE-CELL patch recording
• 年，卷（期）: 2013,（2）
• 页码范围: 120-125
• 页数: 6页
• 分类号: R77

摘要

AIM: To investigate inhibitory γ-aminobutyric acid (GABA) ergic postsynaptic currents (IPSCs) and postsynaptic currents (PSCs) in layer IV of the rat visual cortex during the critical period and when plasticity was extended through dissolution of the perineuronal nets (PNNs). METHODS: We employed 24 normal Long-Evans rats to study GABA A-PSC characteristics of neurons within layer IV of the visual cortex during development. The animals were divided into six groups of four rats according to ages at recording: PW3 (P21 -23d), PW4 (P28 -30d), PW5 (P35-37d), PW6 (P42-44d), PW7 (P49-51d), and PW8 (56-58d). An additional 24 chondroitin sulfate proteoglycan (CSPG) degradation rats (also Long-Evans) were generated by making a pattern of injections of chondroitinase ABC (chABC) into the visual cortex 1 week prior to recording at PW3, PW4, PW5, PW6, PW7, and PW8. Immunohistochemistry was used to identify the effect of chABC injection on CSPGs. PSCs were detected with whole-cell patch recordings, and GABA A receptor-mediated IPSCs were pharmacologically isolated. RESULTS: IPSC peak current showed a strong rise in the age-matched control group, peaked at PW5 and were maintained at a roughly constant value thereafter. Although there was a small increase in peak current for the chABC group with age, the peak currents continued to decrease with the delayed highest value at PW6, resulting in significantly different week-by-week com-parison with normal development. IPSC decay time continued to increase until PW7 in the control group, while those in the chABC group were maintained at astable level after an initial increase at PW4. Compared with normal rats, the decay times recorded in the chABC rats were always shorter, which differed significantly at each age. We did not observe any differences in IPSC properties between the age-matched control and penicillinase (P-ase) group. However, the change in IPSCs after chABC treatment was not reflected in the total PSCs or in basic membrane properties in layer IV of the rat visual cort