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Published on: August 13, 2019
Inhibitory effect of 17β-estradiol on the THIK-1 channel
Michihiro Tateyama1,2, Yoshihiro Kubo1,2
1Division of Biophysics & Neurobiology, Department of Molecular and Cellular Physiology, National Institute for Physiological Sciences, Okazaki, Japan.
Estradiol inhibits the THIK-1 potassium channel, crucial for immune cells. Specific mutations reveal that the channel's "pond" region is key for this inhibition, with implications for THIK-1 variants.
Area of Science:
- Neuroimmunology
- Ion Channel Physiology
- Molecular Pharmacology
Background:
- Two-pore domain potassium (K2P) channels, specifically THIK-1, are vital in microglia and macrophages.
- THIK-1 is modulated by arachidonic acid, GPCRs, and anesthetics.
- Steroids like cholesterol, estradiol, and progesterone are known K+ channel modulators.
Purpose of the Study:
- To investigate the effects of steroids, particularly estradiol, on THIK-1 channel activity.
- To identify the specific residues and structural regions of THIK-1 involved in steroid modulation.
- To explore the physiological and pathological relevance of THIK-1 variants in response to steroid inhibition.
Main Methods:
- Electrophysiological recordings to assess THIK-1 channel activity.
- Site-directed mutagenesis to create specific THIK-1 variants (e.g., F142A, V269A, Y273A, F145A, F276A, T237S).
- Molecular docking simulations to predict estradiol binding sites on THIK-1.
Main Results:
- Estradiol inhibited mouse THIK-1 by approximately 40% (IC50 = 4.9 ± 1.5 μM).
- Mutations F142A, V269A, and Y273A in the THIK-1 'pond' region reduced estradiol's inhibitory effect.
- Mutations F145A, F276A, and T237S (human variant) showed altered sensitivity to estradiol and other steroids, suggesting conformational changes.
Conclusions:
- Estradiol-mediated inhibition of THIK-1 is dependent on residues within the channel's 'pond' region.
- Specific THIK-1 residues influence sensitivity to various steroids, including estradiol, estrone, estriol, and progesterone.
- Understanding these interactions is crucial for THIK-1 variants, particularly those sensitive to low estradiol concentrations, impacting neuroinflammation and disease.
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