The effect of an extract from Ganoderma lucidum (reishi) on the labeling of blood constituents with technetium-99m and on the survival of Escherichia coli

ABSTRACT

This study evaluated effects of an aqueous extract of Ganoderma lucidum (reishi) on the labeling of bloodconstituents with technetium-99m (99mTc) and on the survival of cultures of Escherichia coli treated with stannouschloride. Blood samples from Wistar rats were treated with reishi extract, radiolabeling procedure was performed,plasma (P), blood cells (BC) and insoluble (IF) and soluble (SF) fractions of P and BC were separated. Theradioactivity was counted for the determination of the percentages of radioactivity (%ATI). Cultures of Escherichia coli AB1157 were treated with stannous chloride in the presence and absence of reishi extract. Blood samples and bacterial cultures treated with NaCl 0.9% were used as controls. Data indicated that reishi extract alteredsignificantly (p<0.05) the %ATI of P, BC, IF-P, SF-P, IF-BC and SF-BC, as well as increased the survival of bacterial cultures treated with stannous chloride. Our results suggest that reishi extract could present a redox/chelating action, altering the labeling of blood constituents with 99mTc and protecting bacterial cultures against oxidative damage induced by stannous chloride.

RESUMO

Este estudo avaliou efeitos de um extrato de Ganoderma lucidum (reishi) na marcação de constituintes sangüíneos com tecnécio-99m (99mTc) e na sobrevivência de culturas deEscherichia coli tratadas com cloreto estanoso. Amostras de sangue de ratos Wistar foram tratadas com extrato de reishi, o procedimento de radiomarcação foi realizado, plasma (P), célulassangüíneas (CS) e frações insolúvel (FI) e solúvel (FS) de P e CS foram separadas e a radioatividade foi contada para determinação das porcentagens deradioatividade (%ATI). Culturas de Escherichia coli AB1157 foram tratadas com cloreto estanoso na presença e ausência do extrato de reishi. Amostras de sangue e culturas bacterianas tratadas com NaCl 0.9% foram usadas como controles. Dados indicaram que o extrato de reishi alterou significativamente (p<0,05) a %ATI de P, CS, FIP, FS-P, FI-CS e FS-CS, bem como, aumentou a sobrevivência de culturas bacterianas tratadas comcloreto estanoso. Nossos resultados sugerem que o extrato de reishi poderia apresentar ação redox/quelante alterando a marcação de constituintes sangüíneos com 99mTc e protegendoculturas bacterianas contra lesões oxidativas induzidas pelo cloreto estanoso.