Betreff: Study Shows Glial Cells Affected By Cell Phones
Datum: Sun, 15 Jul 2007 07:44:03 -0700 (PDT)
Glial cells, commonly called neuroglia or
simply glia (greek for "glue"), are non-neuronal cells that provide
support and nutrition, maintain homeostasis, form myelin, and participate in
signal transmission in the nervous system. In the human brain, glia are
estimated to outnumber neurons by about 10 to 1.
Glial cells provide support and protection for neurons, the other main type of cell in the central nervous system. They are thus known as the "glue" of the nervous system. The four main functions of glial cells are to surround neurons and hold them in place, to supply nutrients and oxygen to neurons, to insulate one neuron from another, and to destroy pathogens and remove dead neurons.
Toxicology. 2007 May 26; [Epub ahead of print]
Effect of an acute 900MHz GSM exposure on glia in the rat brain: A time-dependent study.
Brillaud E, Piotrowski A, de Seze R.
INERIS, Unité de Toxicologie Expérimentale, Parc Technologique ALATA, BP no. 2, 60550 Verneuil-en-Halatte, France.
Because of the increasing use of mobile phones, the possible risks of radio frequency electromagnetic fields adverse effects on the human brain has to be evaluated. In this work we measured GFAP expression, to evaluate glial evolution 2, 3, 6 and 10 days after a single GSM exposure (15min, brain averaged SAR=6W/kg, 900MHz signal) in the rat brain. A statistically significant increase of GFAP stained surface area was observed 2 days after exposure in the frontal cortex and the caudate putamen. A smaller statistically significant increase was noted 3 days after exposure in the same areas and in the cerebellum cortex. Our results confirm the Mausset-Bonnefont et al. study [Mausset-Bonnefont, A.L., Hirbec, H., Bonnefont, X., Privat, A., Vignon, J., de Seze, R., 2004. Acute exposure to GSM 900MHz electromagnetic fields induces glial reactivity and biochemical modifications in the rat brain. Neurobiol. Dis. 17, 445-454], showing the existence of glial reactivity after a 15min GSM acute exposure at a brain averaged SAR of 6W/kg. We conclude to a temporary effect, probably due to a hypertrophy of glial cells, with a temporal and a spatial modulation of the effect. Whether this effect could be harmful remains to be studied.
PMID: 17624651 [PubMed - as supplied by publisher]
Posted By prd34 to Do You Have Microwave Illness? at 7/15/2007 10:39:00 PM