Swedish researchers find that adult wireless phone users have elevated levels of a protein involved in protecting the brain against harmful foreign substances.
In that wireless phones emit low-intensity non-thermal microwave radiation, Fredrik Soderqvist, from Orebro University (Sweden), and colleagues studied whether exposure to a mobile phone-like signal alters the integrity of the human blood-brain and blood-cerebrospinal fluid barriers. The researchers conducted a provocation study that exposed 41 subjects to 30 minutes of GSM 890 MHz signal delivered to the temporal area of the head. The team collected blood samples pre- and post-exposure, and found the subjects had elevated levels of transthyretin, a protein that is found in the blood-cerebrospinal fluid barrier that protects the brain against harmful foreign substances in the blood system.
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Soderqvist, F., Carlberg, M., Hansson Mild, K., Hardell, L. “Exposure to an 890-MHz mobile phone-like signal and serum levels of S100B and transthyretin in volunteers.” Toxicology Letters, 189 (1), p.63-66, Aug 2009.