Role of uptake in?-aminobutyric acid (GABA)-mediated responses in guinea pig hippocampal neurons

1985 ◽  
Vol 5 (4) ◽  
pp. 353-371 ◽  
Author(s):  
John J. Hablitz ◽  
Frank J. Lebeda
Keyword(s):  
Guinea Pig ◽  
Hippocampal Neurons ◽  
Aminobutyric Acid

Pentobarbital inhibits hippocampal neurons by increasing potassium conductance

1987 ◽  
Vol 65 (1) ◽  
pp. 36-41 ◽  
Author(s):  
M. O'Beirne ◽  
N. Gurevich ◽  
P. L. Carlen
Keyword(s):  
Guinea Pig ◽  
Spontaneous Activity ◽  
Hippocampal Neurons ◽  
Potassium Conductance ◽  
Pyramidal Cells ◽  
Input Resistance ◽  
Aminobutyric Acid ◽  
Sodium Pentobarbital ◽  
Intracellular Recordings ◽  
Neuronal Inhibition

The effects of sodium pentobarbital were studied using intracellular recordings from CA1 and CA3 pyramidal cells in slices of guinea pig hippocampus. Drugs were applied either by perfusion or by pressure ejection at concentrations of 10−6, 10−5, and 10−4 M. Pentobarbital at all concentrations caused neuronal hyperpolarization, decreased spontaneous activity, and sometimes decreased input resistance. Hyperpolarization also occurred in zero calcium perfusate or with tetrodotoxin in the perfusate. The postspike train long-lasting afterhyperpolarization, which is an intrinsic calcium-mediated potassium conductance, was increased at all doses. γ-Aminobutyric acid induced depolarizing dendritic responses were augmented only at 10−4 M pentobarbital. It is proposed that one of the important mechanisms of pentobarbital neuronal inhibition, particularly at lower doses, is an increase in potassium conductance.

scholarly journals Downregulation of miR-383 reduces depression-like behavior through targeting Wnt family member 2 (Wnt2) in rats

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shanshan Liu ◽  
Qing Liu ◽  
Yanjie Ju ◽  
Lei Liu
Keyword(s):  
Inflammatory Response ◽  
Family Member ◽  
Chronic Stress ◽  
Hippocampal Neurons ◽  
Luciferase Reporter ◽  
Mild Stress ◽  
Neural Injury ◽  
Expression Levels ◽  
Qrt Pcr

AbstractThis study aimed to evaluate the role of miR-383 in the regulation of Wnt-2 signaling in the rat model of chronic stress. The male SD rats with depressive-like behaviors were stimulated with chronic unpredictable mild stress (CUMS) including ice-water swimming for 5 min, food deprivation for 24 h, water deprivation for 24 h, stimulating tail for 1 min, turning night into day, shaking for 15 min (once/s), and wrap restraint (5 min/time) every day for 21 days. The expression levels of miRNAs were detected by qRT-PCR, and the expression levels of Wnt2, depression-impacted proteins (GFAP, BDNF, CREB), brain neurotransmitters (5-HT, NE, DA) and apoptosis-related proteins (Bax and Bcl-2) were evaluated by qRT-PCR and western blot. Bioinformatic analysis and luciferase reporter assay were performed to determine the relationship between miR-383 and Wnt2. Ethological analysis was evaluated by sugar preference test, refuge island test and open field tests. Rescue experiments including knockdown of miR-383, overexpression and silencing of Wnt2 were performed to determine the role of miR-383. High expression levels of miR-383 were observed in the hippocampus of rats submitted to CUMS model. Downregulation of miR-383 significantly inhibited the apoptosis and inflammatory response of hippocampal neurons, and increased the expression levels of GFAP, BDNF and CREB which were impacted in depression, as well as neurotransmitters, then attenuated neural injury in rats induced by CUMS. Furthermore, Wnt family member 2 (Wnt2) was identified as a target of miR-383, and silencing of Wnt2 obviously attenuated the protective effect of miR-383 inhibitor on the apoptosis and inflammatory response in hippocampal neurons, as well as neural injury in CUMS-induced rats. Downregulation of miR-383 ameliorated the behavioral and neurochemical changes induced by chronic stress in rats by directly targeting Wnt2, indicating that the miR-383/Wnt2 axis might be a potential therapeutic target for MDD.

scholarly journals Role of chloride channels in bradykinin-induced guinea pig airway vagal C-fibre activation

2005 ◽  
Vol 566 (1) ◽  
pp. 205-212 ◽  
Author(s):  
Min-Goo Lee ◽  
Donald W. MacGlashan ◽  
Bradley J. Undem
Keyword(s):  
Guinea Pig ◽  
Chloride Channels ◽  
C Fibre

scholarly journals Role of endothelial cell hyperpolarization in EDHF-mediated responses in the guinea-pig carotid artery

2000 ◽  
Vol 129 (6) ◽  
pp. 1103-1112 ◽  
Author(s):  
J -F Quignard ◽  
M Félétou ◽  
G Edwards ◽  
J Duhault ◽  
A H Weston ◽  
...  
Keyword(s):  
Endothelial Cell ◽  
Carotid Artery ◽  
Guinea Pig
Sign in / Sign up

Export Citation Format

Share Document