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Effects of microwave exposure on the hamster immune system 2. peritoneal macrophage function



Effects of microwave exposure on the hamster immune system 2. peritoneal macrophage function



Bioelectromagnetics 4(2): 141-156



Acute exposure of hamsters to microwave energy (2.45 GHz; 25 mW/cm2 for 60 min) resulted in activation of peritoneal macrophages that were significantly more viricidal to vaccinia virus as compared to sham-exposed or normal (minimum handling) controls. Macrophages from microwave-exposed hamsters became activated as early as 6 h after exposure and remained activated for up to 12 days. The activation of macrophages by microwave exposure paralleled the macrophage activation after vaccinia virus immunization. Activated macrophages from vaccinia-immunized hamsters did not differ in their viricidal activity when the hamsters were microwave- or sham-exposed. Exposure for 60 min at 15 mW/cm2 did not activate the macrophages; 40 mW/cm2 exposure was harmful to some hamsters. Average maximum core temperatures in the exposed (25 mW/cm2) and sham groups were 40.5.degree. C (.+-. 0.35 SD) and 38.4.degree. C (.+-. 0.5 SD), respectively. In vitro heating of macrophages to 40.5.degree. C was not as effective as in vivo microwave exposure in activating macrophages to the viricidal state. Macrophages from normal, sham-exposed and microwave-exposed hamsters were not morphologically different; they all phagocytosed India ink particles. Immune macrophage cytotoxicity for virus-infected or noninfected target cells was not suppressed in the microwave-irradiated group (25 mW/cm2, 1 h) as compared to sham-exposed controls, indicating that peritoneal macrophages were not functionally suppressed or injured by microwave hyperthermia.

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Accession: 005314415

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PMID: 6223642



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