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Carcinogenesis, Vol. 22, No. 7, 1043-1048, July 2001

Magnetic fields (MF) of 50 Hz at 1.2 T as well as 100 T cause uncoupling of inhibitory pathways of adenylyl cyclase mediated by melatonin 1a receptor in MF-sensitive MCF-7 cells

Domingo 13 de mayo de 2007 · 1589 lecturas

Carcinogenesis, Vol. 22, No. 7, 1043-1048, July 2001
2001 Oxford University Press

CANCER BIOLOGY

Magnetic fields (MF) of 50 Hz at 1.2 T as well as 100 T cause uncoupling of inhibitory pathways of adenylyl cyclase mediated by melatonin 1a receptor in MF-sensitive MCF-7 cells
Masami Ishido,1, Hiroshi Nitta and Michinori Kabuto

Regional Environment Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-0053, Japan

Abstract

Magnetic fields (MF) of 60 Hz at 1.2 T were previously shown to inhibit the antiproliferative effect of melatonin on MCF-7 cells (Liburdy,R.P., 1993, J. Pimeal Res. 14, 89-97). In addition, three laboratories (Blackman,C.F. and Benane,S.G., 1998; Luben,R.A. and Morgan,A.P., 1998; Morris,J.E., Chrisler,W.B., Miller,D.L., Sasser,L.B. and Anderson,L.E., 1998; 20th Annual Meeting of the Bioelectromagnetics Society, At. Pete Beach, FL) independently reported results consistent with this finding. In this study, we investigated the molecular basis of the biological effects of MF using MCF-7 cells. Only 1a melatonin receptors were identified by the [125I]melatonin binding assay and RT-PCR analysis. Moreover, preceding exposures to MF of 100 T for 3, 5 and 7 days blocked the melatonin-induced inhibition of cAMP accumulation in a time-dependent manner, while none of the melatonin receptor functions or GTPase and adenylyl cyclase activities were affected. Estrogen-evoked cell proliferation was not altered by MF either. Exposure to 1.2 T MF exerted the same effects on the melatonin-signaling pathway as that to 100 T. Thus, this is the first study to provide evidence that MF may cause uncoupling of signal transduction from melatonin receptors to adenylyl cyclase.

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