[A study on dose-effect of suppression to gap junctional intercellular communication function by 50-Hz magnetic fields].

OBJECTIVE

To study the relationship between dose of exposure to 50-Hz magnetic field (MF) and its effects of suppression to gap junctional intercellular communication (GJIC) function.

METHODS

Lucifer yellow, a kind of fluorescent dye, was led into single CHL cell by iontophoretic injection. Number of dye-coupled cells (DCC) five minutes after injection was used as an indicator for GJIC function. The effects of different intensities and irradiation of MF on GJIC in CHL cells were studied.

RESULTS

Suppression to GJIC by 50-Hz MF depended on its flux intensity. Irradiation with lower flux intensity (0.05, 0.2 and 0.4 mT) of the MF for 24 hours could not inhibit GJIC, but that with higher intensity (0.8 and 1.6 mT) could. No "amplitude window" effect was appeared by irradiation with MF at intensities of zero to 1.6 mT. Exposure to MF at a fixed intensity of 0.8 mT for five minutes had no effects, but that for one hour was more than enough to inhibit GJIC, with the most apparent effects for 24-hour exposure. In addition, it was showed that suppression to GJIC was caused by direct action of 50-Hz MF rather then induced electrical field.

CONCLUSION

MF of 50-Hz had suppression to GJIC with a dose-effect relationship.