この研究は、低レベルのマイクロ波(電力密度が平均では10 mW/ cm2、範囲は5〜50 mW/ cm2で、周波数 1 GHzの連続波およびパルス波)ばく露が、インビトロでのL1210マウス白血病細胞のメトトレキセート(MTX)による治療効果(取り込み、作用、およびDNA合成阻害)に与える影響、さらに、白血病をもつマウスでのMTX処置への影響を調べた。MTX濃度は0.2μM、マイクロ波ばく露時間は20分間とした。その結果、連続波ばく露群の細胞では、無ばく露対照群に比べ、 [3H] MTXの取り込みが増強された;この強化は、電力密度範囲5〜25 mW/ cm2においてのみ見られ、逆U字型の関係があった;マイクロ波ばく露のみで、DNA合成の阻害が見られた; MTX単独処理された細胞懸濁液と比較して、マイクロ波ばく露後にMTX処理された細胞懸濁液では、DNA合成の阻害の増強が見られた; L1210担がんマウスのマイクロ波とMTXの組み合わせ処置群は、MTX単独処置群に比べ、生存期間が延長された、と報告している。
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To study the effects of low power density microwave radiation (continuous and pulsed wave) on the uptake and action of methotrexate (MTX), the inhibtion of DNA synthesis in murine leukemia cells in vitro, and the MTX treatment of mice bearing this leukemia.
MTX concentrations of 0.2 µM and irradiation times of 20 min, the authors found that continuous wave low power density microwave exposure enhances the uptake of [³H]MTX as compared to nonirradiated controls. The enhancement is observed in only a small range of power densities (5 to 25 mW/cm²). Microwave exposure alone has an inhibitory effect on the [³H]dUrd incorporation into DNA. Compared to cell suspensions treated with MTX alone, groups treated with microwave irradiation followed by MTX exhibit an augmentation of inhibition of DNA synthesis. Combined treatment of L1210-bearing mice with microwave irradiation and MTX in vivo prolonged the duration of survival over that mice treated with MTX alone. This indicates a greater killing of leukemia cells. The results suggest that the therapeutic index of MTX may be improved by the use of microwave irradiation at low power densities.