The neuroprotective effects and mechanisms of action of exposure of mice to a pulsed 60 Hz magnetic field after ischemic stroke should be investigated.
Ischemic strokes were experimentally induced in male mice. After the stroke, mice were divided into 2 groups (n=18 each): 1) exposure to the magnetic field and 2) sham exposure. Mice from each group were killed after 1, 3 and 14 days of exposure (remark EMF-Portal: respective numbers were not stated).
| Exposure | Parameters |
|---|---|
|
Exposure 1:
60 Hz
Exposure duration:
intermittent for 6 h/day for up to 14 days
|
|
exposure started within 30-40 min after experimentally induced stroke
| Frequency | 60 Hz |
|---|---|
| Type | |
| Waveform | |
| Exposure duration | intermittent for 6 h/day for up to 14 days |
| Additional info | no details on pulse modulation |
| Exposure source |
|
|---|---|
| Setup | mice could move freely during exposure |
| Sham exposure | A sham exposure was conducted. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 10 mT | - | calculated | - | - |
Exposed mice had significantly longer rotarod times compared to sham exposed mice, indicating better motoric functions.
Previous studies suggested that BDNF and protein kinase C play a central role in neuroprotection, which was confirmed in this study by a significantly increased expression of BDNF, TrkB and phosphorylated protein kinase B in exposed mice compared to sham exposed mice after 3 and 14 days. This resulted further in a significant decrease of gene expression and protein expression of pro-apoptotic Bad, Bax, caspase 3 and a significant increase of anti-apoptotic Bcl-xL expression in the exposure group compared to the sham exposure group.
Moreover, the protein expression of inflammatory mediators MMP9 and IL-1β was significantly decreased in exposed mice compared to sham exposed mice after 3 and 14 days of exposure.
The authors conclude that exposure of mice to a pulsed 60 Hz magnetic field might have a neuroprotective effect after ischemic stroke via suppression of inflammation and apoptosis. They propose that low frequency pulsed electromagnetic fields may be beneficial as a treatment during recovery after ischemic stroke.
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