[escepticos] Electromagnetic fields stress living cells.

[Daurmith]

No es por dar de comer al troll, pero esto me ha parecido curioso. 
Estaba buscando más publicaciones del tal Goodman y he encontrado esto:

 J Cell Physiol. 2008 Sep;216(3):816-23

Myocardial function improved by electromagnetic field induction of 
stress protein hsp70.
George I, Geddis MS, Lill Z, Lin H, Gomez T, Blank M, Oz MC, Goodman R.

Department of Surgery, Division of Cardiothoracic Surgery, Columbia 
University College of Physicians and Surgeons, New York, New York 10032, 
USA.

Studies on myocardial function have shown that hsp70, stimulated by an 
increase in temperature, leads to improved survival following 
ischemia-reperfusion (I-R). Low frequency electromagnetic fields (EMFs) 
also induce the stress protein hsp70, but without elevating temperature. 
We have examined the hemodynamic changes in concert with EMF 
pre-conditioning and the induction of hsp70 to determine whether 
improved myocardial function occurs following I-R injury in 
Sprague-Dawley rats. Animals were exposed to EMF (60 Hz, 8 microT) for 
30 min prior to I-R. Ischemia was then induced by ligation of left 
anterior descending coronary artery (LAD) for 30 min, followed by 30 min 
of reperfusion. Blood and heart tissue levels for hsp70 were determined 
by Western blot and RNA transcription by rtPCR. Significant upregulation 
of the HSP70 gene and increased hsp70 levels were measured in response 
to EMF pre-exposures. Invasive hemodynamics, as measured using a volume 
conductance catheter, demonstrated significant recovery of systolic 
contractile function after 30 min of reperfusion following EMF exposure. 
Additionally, isovolemic relaxation, a measure of ventricular diastolic 
function, was markedly improved in EMF-treated animals. In conclusion, 
non-invasive EMF induction of hsp70 preserved myocardial function and 
has the potential to improve tolerance to ischemic injury.

---

Todavía no me he leído ambos artículos, pero tiene guasa la cosa, te 
hace pensar algo así como "A ver, ¿en qué quedamos?".

Adela

Juan escribió:
> Joder, qué olor a gallináceo... otra dirección más al filtro.
>
>   
>> Date: Mon, 30 Mar 2009 09:01:12 -0700
>> From: geremiasyohnson en yahoo.es
>> To: escepticos en dis.ulpgc.es
>> Subject: [escepticos] Electromagnetic fields stress living cells.
>>
>> http://www.ncbi.nlm.nih.gov/pubmed/19268550
>>
>>
>>
>> Electromagnetic fields stress living cells.
>>
>> Blank M, Goodman R.
>> Department of Physiology, Columbia University, New York, NY, USA.
>> Electromagnetic
>> fields (EMF), in both ELF (extremely low frequency) and radio frequency
>> (RF) ranges, activate the cellular stress response, a protective
>> mechanism that induces the expression of stress response genes, e.g.,
>> HSP70, and increased levels of stress proteins, e.g., hsp70. The 20
>> different stress protein families are evolutionarily conserved and act
>> as 'chaperones' in the cell when they 'help' repair and refold damaged
>> proteins and transport them across cell membranes. Induction of the
>> stress response involves activation of DNA, and despite the large
>> difference in energy between ELF and RF, the same cellular pathways
>> respond in both frequency ranges. Specific DNA sequences on the
>> promoter of the HSP70 stress gene are responsive to EMF, and studies
>> with model biochemical systems suggest that EMF could interact directly
>> with electrons in DNA. While low energy EMF interacts with DNA to
>> induce the stress response, increasing EMF energy in the RF range can
>> lead to breaks in DNA strands. It is clear that in order to protect
>> living cells, EMF safety limits must be changed from the current
>> thermal standard, based on energy, to one based on biological responses
>> that occur long before the threshold for thermal changes.
>>
>>
>> "it´s clear"... estos hippys tecnófobos van a ser la muerte de todos nosotros.
>>
>> Saludos.
>>
>>
>>       
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