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Preparation of Acute Hippocampal Slices from Rats and Transgenic Mice for the Study of Synaptic Alterations during Aging and Amyloid Pathology
Published on: March 23, 2011
Thymosin alpha-1 modulates excitatory synaptic transmission in cultured hippocampal neurons in rats
Sheng Yang1, Zhen-Wei Liu, Wen-Xia Zhou
1DBeijing Institute of Pharmacology and Toxicology, 27 Tai-Ping Road, Haidian District, Beijing 100850, China.
Insights
Thymosin alpha-1 enhances excitatory synaptic transmission frequency in rat hippocampal neurons. This peptide
Area of Science:
- Neuroscience
- Immunology
- Molecular Biology
Background:
- Thymosin alpha-1 (Talpha1) is known for its immunoregulatory roles.
- Talpha1 is also present in the central nervous system (CNS) and influences its function.
Purpose of the Study:
- To investigate the specific effects of Talpha1 on synaptic transmission in the CNS.
- To elucidate the neurophysiological functions of Talpha1 in hippocampal neurons.
Main Methods:
- Whole-cell recording technique was employed.
- Cultured rat hippocampal neurons were used to study spontaneous excitatory synaptic transmission.
- The impact of Talpha1 on AMPA-mediated postsynaptic currents was analyzed.
Main Results:
- Talpha1 significantly increased the frequency of spontaneous excitatory postsynaptic currents (sEPSCs) mediated by AMPA receptors at 1 and 10 microg/ml.
- Talpha1 also enhanced the frequency of miniature excitatory postsynaptic currents (mEPSCs) at 10 microg/ml.
- No significant changes were observed in the amplitude of sEPSCs or mEPSCs.
Conclusions:
- Talpha1 plays a role in regulating excitatory synaptic transmission in hippocampal neurons.
- These findings suggest a neurophysiological function for Talpha1 within the CNS.
Abstract:
Thymosin alpha-1 (Talpha1) not only possesses immunoregulatory properties in periphery but also is expressed in the central nervous system (CNS) and affects the function of the CNS. To further elucidate the role of Talpha1 in the CNS, the whole-cell recording technique was used to observe the effect of Talpha1 on the spontaneous excitatory synaptic transmission in cultured rat hippocampal neurons. The results showed that acute treatment with Talpha1 significantly enhanced the frequency of AMPA-mediated spontaneous excitatory postsynaptic current (sEPSC) at the concentrations of 1 and 10 microg/ml and also enhanced the frequency of AMPA-mediated miniature excitatory postsynaptic current (mEPSC) at 10 microg/ml. However, the amplitude of both sEPSC and mEPSC were not changed by Talpha1. Those results suggested that Talpha1 involves in the regulation of excitatory synaptic transmission in hippocampal neurons, which contribute to its neurophysiological function in the CNS.
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