Effects of moderate static magnetic fields on voltage-gated potassium ion channels in sympathetic neuron-like PC12 cells

Abstract

Category: Neuroscience Tags: static magnetic fields, potassium channels, sympathetic neurons, PC12 cells, neuronal excitability, electrophysiology, gene expression DOI: 10.14814/phy2.70236 URL: physoc.onlinelibrary.wiley.com Overview Exposure to moderate static magnetic fields (SMF) has been shown to alter neuronal excitability, yet the specific effects on sympathetic neurons have been largely unstudied. This investigation evaluates how moderate SMF affects voltage-gated potassium (Kv) channels in the plasma membrane of sympathetic neuron-like PC12 cells. Findings - Kv channel current density was significantly reduced in PC12 cells subjected to 18 hours of magnet exposure. - This reduction persisted after the magnetic field was removed, indicating a lasting effect on channel function. - Outward current in the presence of tetraethylammonium (TEA) showed no difference between groups, supporting the involvement of TEA-sensitive Kv channels in the observed effect. - RNA sequencing identified 37 genes sensitive to moderate SMF exposure. - KEGG pathway analysis and mRNA expression indicated upregulation of pathways that inhibit neuronal excitability, such as GABAB receptor activation and Kir3 channel opening. Conclusion Moderate SMF exposure is strongly associated with reduced current density in PC12 cells, specifically affecting Kv channels. This study highlights a fundamental link between long-term SMF exposure and altered excitability in sympathetic neurons, suggesting a tangible impact of electromagnetic field exposure on neuronal properties.

AI evidence extraction

Main findings

PC12 cells exposed to a moderate static magnetic field for 18 hours showed a significant reduction in Kv channel current density that persisted after field removal. TEA-sensitive Kv channels were implicated (no group difference in outward current with TEA), and RNA sequencing identified 37 SMF-sensitive genes with pathway/mRNA results indicating upregulation of pathways that inhibit neuronal excitability.

Outcomes measured

• Voltage-gated potassium (Kv) channel current density
• Outward current in presence of tetraethylammonium (TEA)
• Gene expression (RNA sequencing)
• KEGG pathway analysis
• mRNA expression related to neuronal excitability pathways (e.g., GABAB receptor activation, Kir3 channel opening)

Limitations

• Magnetic field strength described as 'moderate' but not quantified in the abstract
• In vitro model (PC12 cells) rather than primary sympathetic neurons or in vivo exposure
• Sample size and detailed methods not provided in the abstract

{
    "study_type": "in_vitro",
    "exposure": {
        "band": "static",
        "source": null,
        "frequency_mhz": 0,
        "sar_wkg": null,
        "duration": "18 hours"
    },
    "population": "Sympathetic neuron-like PC12 cells",
    "sample_size": null,
    "outcomes": [
        "Voltage-gated potassium (Kv) channel current density",
        "Outward current in presence of tetraethylammonium (TEA)",
        "Gene expression (RNA sequencing)",
        "KEGG pathway analysis",
        "mRNA expression related to neuronal excitability pathways (e.g., GABAB receptor activation, Kir3 channel opening)"
    ],
    "main_findings": "PC12 cells exposed to a moderate static magnetic field for 18 hours showed a significant reduction in Kv channel current density that persisted after field removal. TEA-sensitive Kv channels were implicated (no group difference in outward current with TEA), and RNA sequencing identified 37 SMF-sensitive genes with pathway/mRNA results indicating upregulation of pathways that inhibit neuronal excitability.",
    "effect_direction": "mixed",
    "limitations": [
        "Magnetic field strength described as 'moderate' but not quantified in the abstract",
        "In vitro model (PC12 cells) rather than primary sympathetic neurons or in vivo exposure",
        "Sample size and detailed methods not provided in the abstract"
    ],
    "evidence_strength": "low",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "static magnetic fields",
        "SMF",
        "voltage-gated potassium channels",
        "Kv channels",
        "PC12 cells",
        "sympathetic neurons",
        "neuronal excitability",
        "electrophysiology",
        "RNA sequencing",
        "gene expression",
        "KEGG",
        "GABAB receptor",
        "Kir3",
        "TEA"
    ],
    "suggested_hubs": []
}

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