Meta-analysis of Cytochrome P4501A1 MspI Gene Polymorphism and Childhood Acute Leukemia

Objective To investigate the relationship between cytochrome P4501A1 （CYPIA1） Msp I gene polymorphism and childhood acute leukemia （AL）. Methods Relevant literature was extensively searched and screened by Pubmed and Wanfang Database, Chinese Science Journal Database and Chinese Journal Net. Various data consolidation, combined OR values and their 95% CI were tested by RevMan 4.2; Funnel plots were used for the bias analysis. Results Six related literatures were found to meet the requirements. According to heterogeneity results, there was no significant difference in homozygous types（P〉0.05）, while there was significant difference in two others types （P all〈0.05）. For wild CYPIAIMspl homozygous for the reference group, Combined OR of heterozygous mutation, homozygous, heterozygous ＋ homozygous mutation in AL and control groups were 1.18, 0.96, and 1.10 respectively. Subgroup analysis： Z values of CYP1A1Mspl homozygous, heterozygous ＋ homozygous in the acute lymphoblastic leukemia （ALL） and the control group were 0.10 and 0.76 respectively, Z values in non-acute lymphoblastic leukemia and control group were 0.74 and 0.75. Conclusion There is no correlation between CYP1A1Mspl gene polymorphism and the susceptibility of childhood AL.

The benzo(a) pyrene-induced mRNA expression of aromatic hydrocarbon receptor and cytochrome P4501A1 genes in rat liver

Objective To study the benzo(a)pyrene(B[a]P)-induced mRNA expression of aromatic hydrocarbon receptor(AHR)and cytochrome P4501A1(CYP1A1)genes in rat liver.Methods Rats were injected intraperitoneally with 5,10 and 15mg/kg of B[a]P.The total RNAs were extracted from rat livers by RNA purification kit,and the mRNA expression of AHR and CYP1A1 genes was determined by reverse transcription polymerase chain reaction(RT-PCR).β-actin was used as the internal control.The mRNA expression of both AHR and CYP1A1 genes was measured at indicated time points(24,48 and 72h)after B[a]P treatment at three different concentrations(5,10 and 15mg/kg).Results The mRNA expression of AHR gene increased in a time-dependent manner at the concentration of 10mg/kg but not at 5 and 15mg/kg of B[a]P.The mRNA expression of CYP1A1 gene differed significantly at 48h and 24h in rat livers treated with 10 and 15mg/kg dosage of B[a]P.The mRNA expression of AHR and CYP1A1 genes increased with B[a]P treatment in a concentration-dependent manner.The time-dependent increase in mRNA expression was shown by AHR but not by CYP1A1 gene with B[a]P(10mg/kg)treatment.Conclusion This study demonstrates that toxic B[a]P increases the mRNA expression of both AHR and CYP1A1 genes in vivo,suggesting that B[a]P may play a role in cancer genesis by this way.

Sensing cytochrome P4501A1 activity by a resorufin-based isoform-specific fluorescent probe

Cytochrome P4501 A1(CYP1A1),a heme-containing monooxygenase,is of particular importance for human health because of its vital roles in the metabolic activation of pro-carcinogenic compounds to the carcinogens.Deciphering the relevance of CYP1A1 to human diseases and screening of CYP1A1 modulators require reliable tool(s)for probing this key enzyme in complex biological matrices.Herein,a practical and ultrasensitive fluorescence-based assay for real-time sensing CYP1A1 activities in biological systems has been developed,via designing an isoform-specific fluorogenic sensor for CYP1A1(CHPO).The newly developed fluorogenic substrate for CYP1A1 has been carefully investigated in terms of specificity,sensitivity,precision,quantitative linear range and the anti-interference ability.The excellent selectivity,strong anti-interference ability and fast response kinetics,making the practicability of CHPObased CYP1A1 activity assay is better than that of most reported CYP1A1 activity assays.Furthermore,CHPO has been successfully used for imaging CYP1A1 activities in living cells and human tissues,as well as for high-throughput screening of CYP1A1 inhibitors using tissue preparations as enzyme sources.Collectively,this study provided a practical fluorogenic sensor for real-time sensing CYP1A1 in complex biological systems,which would strongly facilitate the investigations on the relevance of CYP1A1 to human diseases and promote high-throughput screening of CYP1A1 modulators for biomedical applications.

葛根素对人细胞色素P4502D6酶活性的影响及其与基因型关系的研究

目的：研究葛根素对人细胞色素P450（ CYP）1D6酶活性的影响及其与CYP1D6基因型的关系。方法（1）体外试验：取肝内胆管结石患者手术切除标本中正常肝组织制备人肝微粒体孵育体系，加入不同浓度葛根素（0、0.015、0.050、0.100、0.100、0.400、0.800 mmol/L）及美托洛尔，以高效液相色谱法检测美托洛尔代谢产物α-羟基美托洛尔产率，以此反映CYP1D6酶活性。（1）体内试验：以18名健康男性[年龄19~16（11±4）岁，体重61~75（69±7）kg]为对象，其中CYP1D6基因型为＊1/＊1、＊1/＊10、＊10/＊10者各6名。试验分3个阶段进行，采用两阶段交叉试验设计。将受试者按照简单随机化分组方法随机分为1组。第1阶段（第1~11天）：1组连续10 d静脉滴注葛根素注射液400 mg/d，另1组不给药，第11天清晨1组受试者均口服美托洛尔100 mg；第1阶段（第11~17天）：1组均不采取任何措施；第3阶段（第18~18天）：第1阶段未服药组连续10 d静脉滴注葛根素注射液400 mg/d，另1组不给药，第18天清晨1组受试者均口服美托洛尔100 mg。第11和18天口服美托洛尔100 mg后收集受试者连续8 h尿液，采用高效液相色谱法测定尿液中美托洛尔及α-羟基美托洛尔浓度，以二者之比反映CYP1D6酶活性。结果体外试验显示经0、0.015、0.050、0.100、0.100、0.400、0.800 mmol/L葛根素处理的人肝微粒体反应体系α-羟基美托洛尔产率分别为（0.018±0.001）、（0.015±0.001）、（0.015±0.001）、（0.011±0.001）、（0.011±0.001）、（0.010±0.001）、（0.005±0.001）mmol/（mg·h），α-羟基美托洛尔产率随着葛根素浓度的升高而逐渐降低，总体均数间差异有统计学意义（ F =30.750，P =0.000）。两两比较显示，0.100、0.100、0.400和0.800 mmol/L葛根素组α-羟基美托洛尔产率明显低于0、0.015、0.050 mmol/L葛根素组（ P﹤0.05），0.100、0.400、0.800 mmol/L 葛根素组明显低于0.015、0.050 mmol/L 葛根素组（ P ﹤0.05），而0.800 mmol/L葛根素组明显低于0.100、0.100、0.400 mmol/L葛根素组（ P﹤0.05）。体内试验显示18名受试者应用葛根素前后尿样中美托洛尔与α-羟基美托洛尔浓度比值分别为1.11±0.55和1.73±0.94，差异有统计学意义（ P﹤0.01）。不同CYP1D6基因型的3组受试者应用葛根素前后尿样中CYP 1D6活性变化程度组间比较，差异无统计学意义。结论葛根素对CYP1D6活性有明显的抑制作用，浓度越高抑制作用越明显，但与CYP1D6基因型无明显相关性。

Single-cell RNA-seq unveils critical regulators of human FOXP3^+regulatory T cell stability

The heterogeneity and plasticity of T lymphocytes is critical for determining immune response outcomes.Functional regulatory T(Treg)cells are commonly characterized by stable FOXP3 expression and have reported to exhibit heterogeneous phenotypes under inflammatory conditions.However,the interplay between inflammation and Treg cell suppressive activity still remains elusive.Here,we utilized singlecell RNA sequencing to investigate how human Treg cells respond to the pro-inflammatory cytokine interleukin-6(IL-6).We observed that Treg cells divided into two subpopulations after IL-6 stimulation.TIGITàunstable Treg cells lost FOXP3 expression and gained an effector-like T cell phenotype,whereas TIGIT+Treg cells retained robust suppressive function.Single cell transcriptome analysis revealed a spectrum of cellular states of IL-6-stimulated Treg cells and how cytochrome P450 family 1 subfamily A member 1(CYP1A1)is a crucial regulator of Treg cell suppressive capability and stability.CYP1A1-deficient human Treg cells developed a Th17-like phenotype after IL-6 stimulation.Our findings implicate CYP1A1 as a previously unidentified regulator of Treg cells that may have target potential for clinical application for biotherapies.

Hepatoprotective and antioxidant effects of dietary Glycyrrhiza polysaccharide against TCDD-induced hepatic injury and RT-PCR quantification of AHR2,ARNT2,CYPIA mRNA in Jian Carp(Cyprinus carpio var.Jian)

To evaluate the protective effects of Glycyrrhiza polysaccharide（GPS） against 2,3,7,8-tetrachlorodibenzo-p-dioxin（TCDD）-induced hepatotoxicity in Jian carp,the fish were fed diets containing GPS at doses of 0.1,0.5 and 1.0 g/kg for 60 days before an intraperitoneal injection of 0.6 μg/kg TCDD at a volume of 0.05 mL/10 g body weight.At 72 hr post-injection,blood and liver samples were taken for biochemical analysis and the fish liver samples were used for the preparation of pathological slices.The results showed that increases in alanine aminotransferase（GPT）,aspartate aminotransferase（GOT）,lactate dehydrogenase（LDH）,and alkaline phosphatase（AKP） in serum induced by TCDD were significantly inhibited by pre-treatment with 1.0 g/kg GPS.Following the 1.0 g/kg GPS pre-treatment,total protein（TP）,albumin（Alb）,catalase（CAT）,glutathione peroxidase（GPx）,total antioxidant capacity（T-AOC） and superoxide dismutase（SOD） activities in liver tissue increased significantly,malondialdehyde（MDA） formation（P ＆lt; 0.05 or P ＆lt; 0.01） was significantly inhibited,and the expression of cytochrome P4501A（CYP1A）,aryl hydrocarbon receptor 2（AHR2） and aryl hydrocarbon receptor nuclear translocator 2（ARNT2） mRNA（P ＆lt; 0.05） was significantly enhanced.Histological observations on fish liver were obtained by preparing paraffin tissue sections via HE staining,and the results showed that histological changes were obviously reduced by 0.5 and 1.0 g/kg GPS.GPS significantly reduced liver tissue damage caused by TCDD.Overall,these results proved the hepatoprotective effect of GPS in protecting against fish liver injury induced by TCDD,and supported the use of GPS（1.0 g/kg） as a hepatoprotective and antioxidant agent in fish.