Thymosin alpha-1 modulates excitatory synaptic transmission in cultured hippocampal neurons in rats.
Yang. Sheng S; Liu. Zhen-Wei ZW; Zhou. Wen-Xia WX; Zhang. Yong-Xiang YX
Key Findings
- Thymosin‑alpha‑1 is present in the brain and can influence neuronal activity.
- Acute exposure (1‑10 µg/ml) increased the frequency of AMPA‑mediated spontaneous excitatory postsynaptic currents in rat hippocampal neurons.
- The amplitude (strength) of those currents was unchanged, indicating a presynaptic effect on release probability rather than postsynaptic sensitivity.
Practical Outcomes
- For biohackers, the data suggest thymosin‑alpha‑1 might have subtle brain‑activating properties, but the experiments were done in rat cells at concentrations far above typical human doses. There’s no clear protocol or dosage to apply now, and more in‑vivo research is needed before considering it for cognitive or performance enhancement.
Summary
The study shows that the peptide thymosin‑alpha‑1 can boost the rate at which brain cells in a rat hippocampus fire tiny excitatory signals, but it doesn't make those signals stronger. This effect was seen only in cultured neurons and at relatively high lab concentrations.
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.
Study Information
pubmed
2003
2003-10-23T00:00:00.000Z
10.1016/s0304-3940(03)00862-0