Objective:To investigate the effects of radiation on growth-arrested(GA) and micronucleus-production(MP) rates,and the radioprotective properties of Thai medicinal plants in mouse macrophage cell line RAW264.7 in vitr...Objective:To investigate the effects of radiation on growth-arrested(GA) and micronucleus-production(MP) rates,and the radioprotective properties of Thai medicinal plants in mouse macrophage cell line RAW264.7 in vitro.Methods:Mouse macrophage cell line(RAW264.7) was cultured in vitro.Various radiation exposures, growth-arrested rate assay,micronucleus production assay,and radioprotection by Thai medicinal plants were performed.Results:The results showed that GA and MP rates forγ-rays and UV were dose-dependent. The 50%-affected dose ofγand UV radiation for the GA rate was 10 Gy and 159 microwatt/cm for 0.5 seconds, respectively.After X-ray exposure,there was no apparent effect on RAW264.7 cells,even with a fortyfold human diagnostic dose.Two exposures toγradiation at 20 Gy resulted in a significantly higher MP rate than 20 Gy single exposure or control(P【0.05).The Thai medicinal plants(Kamin-chun capsules,Curcuma longa Linn;Hed lingeu,Ganoderma lucidum;Ya Pakking capsule,Murdannia loriformis) could not prevent cell damage,but epigallocatechin gallate and L-cysteine could provide protection from 2 Gyγ-ray exposure. Conclusion:γradiation caused chromosomal damage during cell division and UV caused cell death, while X-ray radiation was safe.The radioprotective effects of Thai medicinal plants,Kamin-chun,Hed lingeu, and Ya Pakking,could not prevent cell damage in this study.展开更多
The TAM family of receptors is preferentially expressed by professional and non-professional phagocytes,including macrophages,dendritic cells and natural killer cells in the immune system,osteoclasts in bone,Sertoli c...The TAM family of receptors is preferentially expressed by professional and non-professional phagocytes,including macrophages,dendritic cells and natural killer cells in the immune system,osteoclasts in bone,Sertoli cells in testis,and retinal pigmental epithelium cells in the retina.Mutations in the Mertk single gene or in different combinations of the double or triple gene mutations in the same cell cause complete or partial impairment in phagocytosis of their preys;and as a result,either the normal apoptotic cells cannot be efficiently removed or the tissue neighbor cells die by apoptosis.This scenario of TAM regulation represents a widely adapted model system used by phagocytes in all different tissues.The present review will summarize current known functional roles of TAM receptors and their ligands,Gas 6 and protein S,in the regulation of phagocytosis.展开更多
基金supported by the Faculty of Tropical Medicine,Mahidol University.
文摘Objective:To investigate the effects of radiation on growth-arrested(GA) and micronucleus-production(MP) rates,and the radioprotective properties of Thai medicinal plants in mouse macrophage cell line RAW264.7 in vitro.Methods:Mouse macrophage cell line(RAW264.7) was cultured in vitro.Various radiation exposures, growth-arrested rate assay,micronucleus production assay,and radioprotection by Thai medicinal plants were performed.Results:The results showed that GA and MP rates forγ-rays and UV were dose-dependent. The 50%-affected dose ofγand UV radiation for the GA rate was 10 Gy and 159 microwatt/cm for 0.5 seconds, respectively.After X-ray exposure,there was no apparent effect on RAW264.7 cells,even with a fortyfold human diagnostic dose.Two exposures toγradiation at 20 Gy resulted in a significantly higher MP rate than 20 Gy single exposure or control(P【0.05).The Thai medicinal plants(Kamin-chun capsules,Curcuma longa Linn;Hed lingeu,Ganoderma lucidum;Ya Pakking capsule,Murdannia loriformis) could not prevent cell damage,but epigallocatechin gallate and L-cysteine could provide protection from 2 Gyγ-ray exposure. Conclusion:γradiation caused chromosomal damage during cell division and UV caused cell death, while X-ray radiation was safe.The radioprotective effects of Thai medicinal plants,Kamin-chun,Hed lingeu, and Ya Pakking,could not prevent cell damage in this study.
基金This study was partially supported by NIH EY018830,RR017702,and RR018733Research to Prevent Blindnessand the National Natural Science Foundation of China(Grant Nos.30400229,30670643 and 30870788).
文摘The TAM family of receptors is preferentially expressed by professional and non-professional phagocytes,including macrophages,dendritic cells and natural killer cells in the immune system,osteoclasts in bone,Sertoli cells in testis,and retinal pigmental epithelium cells in the retina.Mutations in the Mertk single gene or in different combinations of the double or triple gene mutations in the same cell cause complete or partial impairment in phagocytosis of their preys;and as a result,either the normal apoptotic cells cannot be efficiently removed or the tissue neighbor cells die by apoptosis.This scenario of TAM regulation represents a widely adapted model system used by phagocytes in all different tissues.The present review will summarize current known functional roles of TAM receptors and their ligands,Gas 6 and protein S,in the regulation of phagocytosis.
