Document Detail

Weak extremely-low-frequency magnetic fields and regeneration in the planarian Dugesia tigrina.
MedLine Citation:
PMID:  7612025     Owner:  NLM     Status:  MEDLINE    
Extremely-low-frequency (ELF), low-intensity magnetic fields have been shown to influence cell signaling processes in a variety of systems, both in vivo and in vitro. Similar effects have been demonstrated for nervous system development and neurite outgrowth. We report that regeneration in planaria, which incorporates many of these processes, is also affected by ELF magnetic fields. The rate of cephalic regeneration, reflected by the mean regeneration time (MRT), for planaria populations regenerating under continuous exposure to combined DC (78.4 muT) and AC (60.0 Hz at 10.0 muTpeak) magnetic fields applied in parallel was found to be significantly delayed (P << 0.001) by 48 +/- 1 h relative to two different types of control populations (MRT approximately 140 +/- 12 h). One control population was exposed to only the AC component of this field combination, while the other experienced only the ambient geomagnetic field. All measurements were conducted in a low-gradient, low-noise magnetics laboratory under well-maintained temperature conditions. This delay in regeneration was shown to be dependent on the planaria having a fixed orientation with respect to the magnetic field vectors. Results also indicate that this orientation-dependent transduction process does not result from Faraday induction but is consistent with a Ca2+ cyclotron resonance mechanism. Data interpretation also permits the tentative conclusion that the effect results from an inhibition of events at an early stage in the regeneration process before the onset of proliferation and differentiation.
K A Jenrow; C H Smith; A R Liboff
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Bioelectromagnetics     Volume:  16     ISSN:  0197-8462     ISO Abbreviation:  Bioelectromagnetics     Publication Date:  1995  
Date Detail:
Created Date:  1995-08-15     Completed Date:  1995-08-15     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  8008281     Medline TA:  Bioelectromagnetics     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  106-12     Citation Subset:  IM; S    
Department of Physics, Oakland University, Rochester, MI 48309, USA.
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MeSH Terms
Calcium / chemistry,  physiology
Cell Differentiation / radiation effects
Cell Division / radiation effects
Electromagnetic Fields*
Magnetics* / classification
Regeneration / radiation effects*
Signal Transduction / radiation effects
Spatial Behavior / radiation effects
Reg. No./Substance:

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