Electric fields and proliferation in a chronic wound model
- Univ. of Pennsylvania, Philadelphia, PA (United States)
A wound model for decubitus and leg ulcers consisting of human dermal fibroblasts in type 1 collagen dermal equivalent matrix (DEM) was exposed in vitro to electric fields similar to postulated endogenous fields in wounds. After an 8--10 day maturation period, conductivity of DEM samples was determined. Then, DEM samples were mounted in overall windows equidistant between Ag/AgCl agar electrodes in exposure chambers containing serum-free medium. A known low-frequency sinusoidal current was then applied for 12 h, and the average electric field amplitude was calculated in the region of the cells. After a 6 h hiatus, {sup 3}H-thymidine was introduced for 6 h. This was followed by assay. Over a series of trials, field amplitude ranged from 18 to 1,000 mV/m at frequencies of 10 and 100 Hz. Proliferation was measured by total DNA and {sup 3}H-thymidine incorporation. Results indicated that a narrow amplitude window between 37 and 50 mV/meter at 10 Hz yielded increases in proliferation: at maximum (41 mV/m), there was a 70% increase in total DNA (P < .01). Increases occurred in {sup 3}H-thymidine incorporation at 41--50 mV/m but not at other amplitudes (P < .05). Increases in total DNA at 41 mV/m occurred at 10 Hz but not 100 Hz (P < .01). {sup 3}H-thymidine incorporation was in agreement (P < .05). Response was also a function of cell density within matrix. Proliferation occurred in the same amplitude and frequency ranges in which endogenous fields are expected to occur.
- OSTI ID:
- 415618
- Journal Information:
- Bioelectromagnetics, Vol. 17, Issue 6; Other Information: PBD: 1996
- Country of Publication:
- United States
- Language:
- English
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