目的研究复方五味子素B对耐奥沙利铂人结肠癌细胞(TH C-8307/O X A)多药耐药性的逆转作用及其机制。方法采用噻唑蓝(M TT)比色法检测奥沙利铂(O X A)和复方五味子素B(γSC)的细胞毒性;碱性磷酸酶免疫组织化学法和W estern blot检测γSC...目的研究复方五味子素B对耐奥沙利铂人结肠癌细胞(TH C-8307/O X A)多药耐药性的逆转作用及其机制。方法采用噻唑蓝(M TT)比色法检测奥沙利铂(O X A)和复方五味子素B(γSC)的细胞毒性;碱性磷酸酶免疫组织化学法和W estern blot检测γSC对TH C-8307/O X A细胞G ST-п蛋白水平的影响。结果γSC(6.0、12.5和25.0μg/m L)对人结肠癌细胞(TH C-8307)和耐奥沙利铂人结肠癌细胞(TH C-8307/O XA)无显著毒性作用(P>0.05),O X A对TH C-8307的IC 50为0.06μg/m L,而对TH C-8307/O X A的IC 50为2.32μg/m L,TH C-8307/O X A是TH C-8307对O X A耐药的39倍,γSC(6.0、12.5和25.0μg/m L)能使O X A对TH C-8307/O X A细胞的IC 50从2.32μg/m L依次下降至0.370、0.128和0.057μg/m L,逆转倍数分别为6.2、18.1和40.7倍。碱性磷酸酶免疫组织化学法和W estern blot检测γSC(12.5μg/m L)处理48 h后,TH C-8307/O X A细胞G ST-п蛋白表达明显降低。结论γSC具有逆转耐奥沙利铂人结肠癌细胞的M D R作用,其作用机制与下调G ST-п表达有关。展开更多
The Association of Schizophrenia, psychosis, and Marijuana is decades old. Swedish Conscripts cohort study <a href="#ref1">[1] </a>was one of the earlier studies which reported dose-dependent ass...The Association of Schizophrenia, psychosis, and Marijuana is decades old. Swedish Conscripts cohort study <a href="#ref1">[1] </a>was one of the earlier studies which reported dose-dependent associations between Marijuana use and schizophrenia. This landmark study was substantiated in other countries through research and systematic reviews <a href="#ref2">[2]</a>, which further strengthened the dose-dependent association between Marijuana and Psychosis. The dose defined in these studies <a href="#ref1">[1]</a> was based on the frequency of use that is more times used means more risk of developing schizophrenia and or related psychosis. The concept of using highly concentrated marijuana is relatively new, especially in the light of episodes lasting longer than anticipated with treatment resistance. There is not much data on how it will change the course of psychosis and affect the current diagnostic criteria for Substance-induced psychosis, Schizophreniform Psychosis, and schizophrenia. Based on these challenges, we report a case of Dabs or concentrated Tetra Hydro Cannabinoid (THC)-induced prolonged psychosis with tachycardia and treatment resistance on two separate occasions. Both inpatient admissions were triggered using concentrated Tetra Hydro Cannabinoid (THC).展开更多
Marijuana use as well as abuse is a significant public health and public safety concern in the United States and using hair to identify marijuana users and abusers has been gaining acceptance in a number of venues inc...Marijuana use as well as abuse is a significant public health and public safety concern in the United States and using hair to identify marijuana users and abusers has been gaining acceptance in a number of venues including workplace, court ordered, and substance abuse treatment monitoring. After the presentation of a fully validated 2-dimensional gas chromatography-tandem mass spectrometry method for the detection of 11-nor-9-carboxy-Δ9-tetrahydrocannabinol (THCA), the chief metabolite of the main psychoactive compound in marijuana, Δ9-tetrahydrocannabinol (THC), we evaluated the usefulness of fingernail clippings as an alternative specimen type to hair by the analysis of a set of 60 matched pairs of head hair and fingernail clippings. The limit of detection was 10 fg/mg, the limit of quantitation was 20 fg/mg, and the assay was linear from 20 fg/mg to 500 fg/mg. The intra- and inter-assay imprecision and bias studies at 4 different concentrations (50, 100, 500, and 1000 fg/mg) were acceptable where all % Target observations were within 16% of their expected concentrations and all %CV calculations were less than 13.5%. THCA was detectable in more fingernail specimens (53.3%) than hair specimens (46.7%) and the mean concentrations in nails were on average 4.9 times higher than in hair (1813 fg/mg and 364 fg/mg, respectively). The THCA concentrations in hair and nail were strongly associated (r = 0.974, P < 0.01, n = 60) and the association was significant. The study demonstrated that fingernail clippings are a suitable alternative specimen type to hair to monitor for marijuana use and abuse.展开更多
文摘目的研究复方五味子素B对耐奥沙利铂人结肠癌细胞(TH C-8307/O X A)多药耐药性的逆转作用及其机制。方法采用噻唑蓝(M TT)比色法检测奥沙利铂(O X A)和复方五味子素B(γSC)的细胞毒性;碱性磷酸酶免疫组织化学法和W estern blot检测γSC对TH C-8307/O X A细胞G ST-п蛋白水平的影响。结果γSC(6.0、12.5和25.0μg/m L)对人结肠癌细胞(TH C-8307)和耐奥沙利铂人结肠癌细胞(TH C-8307/O XA)无显著毒性作用(P>0.05),O X A对TH C-8307的IC 50为0.06μg/m L,而对TH C-8307/O X A的IC 50为2.32μg/m L,TH C-8307/O X A是TH C-8307对O X A耐药的39倍,γSC(6.0、12.5和25.0μg/m L)能使O X A对TH C-8307/O X A细胞的IC 50从2.32μg/m L依次下降至0.370、0.128和0.057μg/m L,逆转倍数分别为6.2、18.1和40.7倍。碱性磷酸酶免疫组织化学法和W estern blot检测γSC(12.5μg/m L)处理48 h后,TH C-8307/O X A细胞G ST-п蛋白表达明显降低。结论γSC具有逆转耐奥沙利铂人结肠癌细胞的M D R作用,其作用机制与下调G ST-п表达有关。
文摘The Association of Schizophrenia, psychosis, and Marijuana is decades old. Swedish Conscripts cohort study <a href="#ref1">[1] </a>was one of the earlier studies which reported dose-dependent associations between Marijuana use and schizophrenia. This landmark study was substantiated in other countries through research and systematic reviews <a href="#ref2">[2]</a>, which further strengthened the dose-dependent association between Marijuana and Psychosis. The dose defined in these studies <a href="#ref1">[1]</a> was based on the frequency of use that is more times used means more risk of developing schizophrenia and or related psychosis. The concept of using highly concentrated marijuana is relatively new, especially in the light of episodes lasting longer than anticipated with treatment resistance. There is not much data on how it will change the course of psychosis and affect the current diagnostic criteria for Substance-induced psychosis, Schizophreniform Psychosis, and schizophrenia. Based on these challenges, we report a case of Dabs or concentrated Tetra Hydro Cannabinoid (THC)-induced prolonged psychosis with tachycardia and treatment resistance on two separate occasions. Both inpatient admissions were triggered using concentrated Tetra Hydro Cannabinoid (THC).
文摘Marijuana use as well as abuse is a significant public health and public safety concern in the United States and using hair to identify marijuana users and abusers has been gaining acceptance in a number of venues including workplace, court ordered, and substance abuse treatment monitoring. After the presentation of a fully validated 2-dimensional gas chromatography-tandem mass spectrometry method for the detection of 11-nor-9-carboxy-Δ9-tetrahydrocannabinol (THCA), the chief metabolite of the main psychoactive compound in marijuana, Δ9-tetrahydrocannabinol (THC), we evaluated the usefulness of fingernail clippings as an alternative specimen type to hair by the analysis of a set of 60 matched pairs of head hair and fingernail clippings. The limit of detection was 10 fg/mg, the limit of quantitation was 20 fg/mg, and the assay was linear from 20 fg/mg to 500 fg/mg. The intra- and inter-assay imprecision and bias studies at 4 different concentrations (50, 100, 500, and 1000 fg/mg) were acceptable where all % Target observations were within 16% of their expected concentrations and all %CV calculations were less than 13.5%. THCA was detectable in more fingernail specimens (53.3%) than hair specimens (46.7%) and the mean concentrations in nails were on average 4.9 times higher than in hair (1813 fg/mg and 364 fg/mg, respectively). The THCA concentrations in hair and nail were strongly associated (r = 0.974, P < 0.01, n = 60) and the association was significant. The study demonstrated that fingernail clippings are a suitable alternative specimen type to hair to monitor for marijuana use and abuse.
