A Novel Pathway of Functional microRNA Uptake and Mitochondria Delivery.

Extracellular microRNAs (miRNAs) play a critical role in horizontal gene regulation. Uptake of extracellular miRNAs by recipient cells and their intracellular transport, however, remains elusive. Here RNA phase separation is shown as a novel pathway of miRNA uptake. In the presence of serum, synthetic miRNAs rapidly self-assembly into ≈110 nm discrete nanoparticles, which enable miRNAs' entry into different cells. Depleting serum cationic proteins prevents the formation of such nanoparticles and thus blocks miRNA uptake. Different from lipofectamine-mediated miRNA transfection in which majority of miRNAs are accumulated in lysosomes of transfected cells, nanoparticles-mediated miRNA uptake predominantly delivers miRNAs into mitochondria in a polyribonucleotide nucleotidyltransferase 1(PNPT1)-dependent manner. Functional assays further show that the internalized miR-21 via miRNA phase separation enhances mitochondrial translation of cytochrome b (CYB), leading to increase in adenosine triphosphate (ATP) and reactive oxygen species (ROS) reduction in HEK293T cells. The findings thus reveal a previously unrecognized mechanism for uptake and delivery functional extracellular miRNAs into mitochondria.

The joint association of physical activity and sedentary behavior with metabolic syndrome among urban men aged 60+ years in regional China.

Objectives: Metabolic syndrome (MetS) is a major public health issue worldwide, which is preventable through physical activity (PA) promotion and sedentary behavior (SB) reduction. However, the joint association of PA and SB with MetS was not well-investigated, particularly in elderly people. This study aimed to examine separate and joint associations of PA and SB with MetS among elderly urban men in China. Methods: In this cross-sectional study conducted in mid-2018, participants were urban men aged 60+ years randomly selected from in Nanjing of China. Exposure variables were PA and SB. The outcome variable was MetS. A participant was categorized as "having MetS" or "not having MetS" in the analysis. Independent variables were PA and SB, which were categorized as "sufficient PA or insufficient PA" and "shortened SB or prolonged SB", respectively. Mixed-effects logistics regression models were applied to calculate odds ratios (ORs) and 95% confidence intervals (CIs) to assess the association of PA and SB with MetS. Results: Totally, 5,520 from 5,792 eligible participants were randomly recruited and their mean age was 68.9 (standard deviation: 16.9) years. The prevalence of MetS was 30.8% (95%CI = 29.6%, 32.0%) among urban men aged 60+ years in the study. After adjustment for potential confounders, subjects with sufficient PA were less likely (OR = 0.77, 95%CI = 0.67, 0.88) to experience MetS, independently of SB, relative to their counterparts with insufficient PA, while a lower odds (OR = 0.74; 95%CI = 0.61, 0.89) of experiencing MetS was examined for participants with shortened SB, also independently of PA, compared to those with prolonged SB in the study. Furthermore, compared to participants with insufficient PA and prolonged SB, those either within categories of insufficient PA and shortened SB (OR = 0.81; 95%CI = 0.65, 0.99), sufficient PA and prolonged SB (OR = 0.80; 95%CI = 0.70, 0.92), or sufficient PA and shortened SB (OR = 0.41; 95%CI = 0.26, 0.63) were at significantly lower risk to experience MetS, respectively. Conclusions: PA was negatively associated with MetS, and SB was positively linked to MetS, which were independent of each other. Moreover, sufficient PA and shortened SB might exert additively joint influence on MetS. This study has important implications that concurrent PA promotion and SB reduction shall be encouraged for people to optimize the effectiveness of MetS prevention.

The Association of Waist Circumference with the Prevalence and Survival of Digestive Tract Cancer in US Adults: A Population Study Based on Machine Learning Methods.

Aims: This paper aims to investigate the relationship of waist circumference (WC) with digestive tract cancer morbidity and mortality. Methods: Based on the data from a nationally representative US population survey, we summarized the prevalence of digestive tract cancer and all-cause mortality of cancer patients across WC quartiles. Adjusted logistic regression and restricted spline curve were used to analyze WC and the prevalence of digestive tract cancer. Moreover, Cox regression and the Kaplan-Meier curve were applied to investigate the association of WC with all-cause mortality. We also attempted to make a model to predict cancer happening. Results: This paper included a total of 34,041 participants, with digestive tract cancer observed in 265 (0.7%) individuals. WC was positively associated with digestive tract cancer morbidity after full adjustment of covariates (OR: 1.72 and 95% CI: 1.41-2.10). Also, individuals in the highest WC group had a higher risk of digestive tract cancer (Q4, OR: 2.71 and 95% CI: 1.48-5.00). Moreover, no significant association was observed in upper digestive cancer, and WC was associated with a longer survival time once diagnosed (hazard ratio (HR): 0.50 and 95% CI: 0.28-0.92). Finally, the model we made proved to be effective. Conclusion: High WC is a risk factor for digestive tract cancer with or without adjusting for body mass index, especially those located in the lower digestive tract. However, once digestive tract cancer has been diagnosed, patients with higher WC showed better survival outcomes. Moreover, machine learning methods can be used to predict digestive tract cancer risk in the future.

Development of a polyacrylamide/chitosan composite hydrogel conduit containing synergistic cues of elasticity and topographies for promoting peripheral nerve regeneration.

Substrate elasticity and topographical guidance are crucial factors for regulating tissue regeneration, but the synergistic effects of both cues on peripheral nerve regeneration are still unclear. In this paper, polyacrylamide/chitosan (PAM/CS) composite hydrogels with synergistic characteristics of elasticity and morphology were prepared using in situ free-radical polymerization and micro-molding. The physicochemical properties of hydrogels were characterized, and the effect on peripheral nerve regeneration was systematically evaluated via in vitro and in vivo experiments, respectively. The in vitro experiments showed that on a PAM/CS composite hydrogel with an elastic modulus of 5.822 kPa/8.41 kPa and a surface groove width of 30 µm, the dorsal root ganglion (DRG) neurite had a strong growth ability and better-oriented status. The samples were taken from each group at 2 and 12 weeks after bridging rabbit sciatic nerve defects with a PAM/CS composite hydrogel conduit. General observation of the rabbit body and transplanted nerve, nerve electro-physiological examination, muscle wet weight recovery rate detection and comparison, observation of sciatic nerve frozen section immunofluorescence staining and myelinated nerve fiber recovery rate comparison were used to evaluate the effect of nerve transplantation. The elastic modulus of 8.41 kPa and groove width of 30 µm were similar to those of the autograft group. At the same time, the signaling pathways, including the focal adhesion markers vinculin, p-FAK, and Rho A protein, referring to axon adhesion and extension, were initially revealed. In summary, our developed hydrogel implants containing synergistic cues of elasticity and topographies may provide a new and effective strategy for the treatment of peripheral nerve injury in the future.

CircEZH2/miR-133b/IGF2BP2 aggravates colorectal cancer progression via enhancing the stability of m6A-modified CREB1 mRNA.

BACKGROUND: Aberrant expression of circular RNAs (circRNAs) contributes to the initiation and progression of human malignancies, but the underlying mechanisms remain largely elusive. METHODS: High-throughput sequencing was performed to screen aberrantly expressed circRNAs or miRNAs in colorectal cancer (CRC) and adjacent normal tissues. A series of gain- and loss-of-function studies were conducted to evaluate the biological behaviors of CRC cells. RNA pulldown, mass spectrometry, RIP, qRT-PCR, Western blot, luciferase reporter assays and MeRIP-seq analysis were further applied to dissect the detailed mechanisms. RESULTS: Here, a novel circRNA named circEZH2 (hsa_circ_0006357) was screened out by RNA-seq in CRC tissues, whose expression is closely related to the clinicpathological characteristics and prognosis of CRC patients. Biologically, circEZH2 facilitates the proliferation and migration of CRC cells in vitro and in vivo. Mechanistically, circEZH2 interacts with m6A reader IGF2BP2 and blocks its ubiquitination-dependent degradation. Meanwhile, circEZH2 could serve as a sponge of miR-133b, resulting in the upregulation of IGF2BP2. Particularly, circEZH2/IGF2BP2 enhances the stability of CREB1 mRNA, thus aggravating CRC progression. CONCLUSIONS: Our findings not only reveal the pivotal roles of circEZH2 in modulating CRC progression, but also advocate for attenuating circEZH2/miR-133b/IGF2BP2/ CREB1 regulatory axis to combat CRC.

Oxidative stress induces meiotic defects of oocytes in a mouse psoriasis model.

Psoriasis, an immune-mediated inflammatory disease, is associated with poor pregnancy outcomes. Emerging evidence indicates that these defects are likely attributed to compromised oocyte competence. Nevertheless, little is known about the underlying associated mechanisms between psoriasis and poor oocyte quality. In this study, we construct an imiquimod-induced chronic psoriasis-like mouse model to review the effects of psoriasis on oocyte quality. We discover that oocytes from psoriasis-like mice display spindle/chromosome disorganization, kinetochore-microtubule mis-attachment, and aneuploidy. Importantly, our results show that melatonin supplement in vitro and in vivo not only increases the rate of matured oocytes but also significantly attenuates oxidative stress and meiotic defects by restoring mitochondrial function in oocytes from psoriasis-like mice. Altogether, our data uncover the adverse effects of psoriasis symptoms on oocytes, and melatonin supplement ameliorates oxidative stress and meiotic defects of oocytes from psoriatic mice.

Therapeutic targeting of hepatic ACSL4 ameliorates NASH in mice.

BACKGROUND AND AIMS: Globally, NAFLD is one of the most common liver disorders, with an estimated prevalence rate of more than 30% in men and 15% in women and an even higher prevalence in people with type 2 diabetes mellitus. Optimal pharmacologic therapeutic approaches for NAFLD are an urgent necessity. APPROACH AND RESULTS: In this study, we showed that compared with healthy controls, hepatic ACSL4 levels in patients with NAFLD were found to be elevated. Suppression of ACSL4 expression promoted mitochondrial respiration, thereby enhancing the capacity of hepatocytes to mediate ß-oxidation of fatty acids and to minimize lipid accumulation by up-regulating peroxisome proliferator-activated receptor coactivator-1 alpha. Moreover, we found that abemaciclib is a potent and selective ACSL4 inhibitor, and low dose of abemaciclib significantly ameliorated most of the NAFLD symptoms in multiple NAFLD mice models. CONCLUSIONS: Therefore, inhibition of ACSL4 is a potential alternative therapeutic approach for NAFLD.

Risk factors and long-term health consequences of macrosomia: a prospective study in Jiangsu Province, China.

We sought to determine risk factors associated with fetal macrosomia and to explore the long-term consequence of infant macrosomia at the age of 7 years. A prospective population based cohort study was designed to examine the associations between maternal and perinatal characteristics and the risk of macrosomia. A nested case-control study was conducted to explore the long-term health consequence of infant macrosomia. The mean maternal age of the macrosomia group was 24.74±3.32 years, which is slightly older than that in the control group (24.35±3.14 years, P = 0.000). The mean maternal body mass index (BMI) at early pregnancy was 22.75±2.81 kg/m(2), which was also higher than that in the control group (21.76±2.59 kg/m(2), P = 0.000). About 64.6% of macrosomic neonates were males, compared with 51.0% in the control group (P = 0.000). Compared with women with normal weight (BMI: 18.5-23.9 kg/m(2)), women who were overweight (BMI: 24-27.9 kg/m(2)) or obese (BMI≥28 kg/m(2)), respectively, had a 1.69-fold (P = 0.000) and a 1.49-fold (P = 0.000) increased risks of having a neonate with macrosomia, while light weight (BMI<18.5 kg/m(2)) women had an approximately 50% reduction of the risk. Furthermore, macrosomia infant had a 1.52-fold and 1.50-fold risk, respectively, of developing overweight or obesity at the age of 7 years (P = 0.001 and P = 0.000). Older maternal age, higher maternal BMI at early pregnancy and male gender were independent risk factors of macrosomia. Macrosomic infant was associated with an increased predisposition to develop overweight or obesity at the beginning of their childhood.

[Association analysis of polymorphisms of metabolizing enzyme genes with chronic benzene poisoning based on logistic regression and multifactor dimensionality reduction].

OBJECTIVE: To explore the association of polymorphisms of metabolizing enzyme genes with chronic benzene poisoning (CBP) comprehensively by case-control design. METHODS: 152 CBP patients and 152 workers occupationally exposed to benzene without poisoning manifestations were investigated. 30 single nucleotide polymorphisms (SNPs) in 13 genes such as CYP2E1 were tested by PCR-RFLP, sequencing approaches. Logistic regression model was used to detect main effects and 2-order interaction effects of gene and/or environment. Multifactor dimensionality reduction (MDR) was used to detect high-order gene-gene or gene-environment interactions. RESULTS: Based on logistic regression, the main effects of GSTP1 rs947894, EPHX1 rs1051740, CYP1A1 rs4646903, CYP2D6 rs1065852 and rs1135840 were found to be significant (P < 0.05) while the confounding factors of sex, cigarette smoking, alcohol consumption and the intensity of benzene exposure were controlled. EPHX1 rs1051740 might be associated with CBP (P = 0.06). There existed 3 types of interactions were as followed: interactions of GSTP1 rs947894 with alcohol consumption, CYP2E1 rs3813867 with EPHX1 rs3738047, EPHX1 rs3738047 with alcohol consumption(P < 0.05), while the main effects of CYP2E1 rs3813867 and EPHX1 rs3738047 were not significant (P > 0.05). The other SNPs did not show any significant associations with CBP. According to MDR, a 3-order interaction with the strongest combined effect was found, i.e. the 3-factor combination of CYP1A1 rs4646903, CYP2D6 rs1065852 and CYP2D6 rs1135840. CONCLUSION: Gene-gene, gene-environment interactions are important mechanism to genetic susceptibility of CBP.

Central administration of kisspeptin-10 inhibits water and sodium excretion of anesthetized male rats and the involvement of arginine vasopressin.

AIM: To investigate the effect of hypothalamus kisspeptin on water and sodium excretion and the possible mechanism. METHOD: The intracerebroventricular (icv) administration and radioimmunoassay were used to observe the effect of kisspeptin-10 on urine flow, sodium and potassium excretion, plasma arginine vasopressin (AVP), and atrial natriuretic peptide (ANP) concentrations in anesthetized male rats. The mediation of renal sympathetic nerve was also investigated by studies conducted on rats with bilateral renal sympathetic denervation. RESULTS: The urine flow, sodium excretion, and free water clearance decreased significantly by icv injection of 5 nmol kisspeptin-10 (p < 0.05) from 30 to 60 min post-injection. Meanwhile, plasma AVP concentrations increased significantly 30 min after the icv injection of 5 nmol kisspeptin-10 (p < 0.05), whereas the equal dose of kisspeptin-10 did not significantly change plasma ANP concentrations. The mean arterial blood pressure, heart rate, and potassium excretion did not significantly change during the experiment. Furthermore, pretreatment with 5 nmol kisspeptin-10 could still significantly decrease urine flow and sodium excretion in renal sympathetic denervated rats. CONCLUSION: Central administration of kisspeptin-10 could inhibit sodium excretion and urine flow in anesthetized male rats, which is probably mediated by increasing the plasma AVP concentration and is independent of plasma ANP concentration and renal sympathetic nerve activity.

[Genetic susceptibility of DNA damage induced by vinyl chloride monomer exposure].

OBJECTIVE: To explore the association between DNA damage induced by vinyl chloride monomer (VCM) and polymorphisms of DNA repair genes and xenobiotic metabolism genes of VCM. METHODS: Comet assay was employed to detect DNA damage. Based on the status of DNA damage, the VCM exposure workers were divided into two groups: DNA damage group (75) and control group (75). Case-control design was used to investigate the association between the genetic polymorphisms and DNA damage induced by VCM. Genotypes of XRCC1 (Arg194Trp, Arg280His and Arg399Gln), XPD (Ile199Met, Asp312Asn and Lys751Gln) and CYP2E1 were identified by the PCR-RFLP. PCR assay was used to detect positive and null genotype of GSTT1 and GSTM1. RESULTS: Univariate analysis showed that the CYP2E1 c1c2/c2c2 and XPD751 Lys/Gln and Gln/Gln genotypes were significantly associated with the increased levels of DNA damage, XRCCI 339 Arg/Gln and Gln/Gln genotypes were significantly associated with the decreased levels of DNA damage (P < 0.01, P < 0.05, respectively). Logistic regression analysis showed that there was significant association between the genotypes of XRCC1 194, XRCC1 399, XPD 751, CYP2E1 and DNA damages. A prominent risk decreasing of DNA damage was observed for those individuals possessing XRCC1 399Arg/Gln + Gln/Gln genotypes (OR: 0.35, 95%CI: 0.12 approximately 1.01, respectively); The results also showed that there were significant associations between CYP2E1 c1c2/c2c2 and DNA damage both in high and low VCM-exposed groups (OR: 2.57, 95%CI: 1.01 approximately 6.59 and OR: 2.57, 95%CI: 0.99 approximately 6.87). CONCLUSION: Cumulative exposure dose and genotypes of XRCC1 194, XRCC1 399, XPD 751 and CYP2E1 may modulate the DNA damage induced by VCM exposure.

Genetic polymorphisms in hMTH1, hOGG1 and hMYH and risk of chronic benzene poisoning in a Chinese occupational population.

Oxidative damage to DNA induced by benzene is an important mechanism of its genotoxicity, which leads to chronic benzene poisoning (CBP). Therefore, genetic variation in DNA repair genes may contribute to susceptibility to CBP in the exposed population. We hypothesized that single nucleotide polymorphisms (SNPs) in hMTH1, hOGG1 and hMYH genes are associated with risk of CBP. We genotyped SNPs at codon 83 of hMTH1, codon 326 of hOGG1, and codon 324 of hMYH in 152 CBP patients and 152 healthy workers occupationally exposed to benzene without poisoning manifestations. The genotypes were determined by polymerase chain reaction-restrained fragment length polymorphism (PCR-RFLP) technique. There were 2.51-fold [adjusted odds ratio (OR(adj)), 2.51; 95% CI, 1.14-5.49; P=0.02] and 2.49-fold (OR(adj), 2.49; 95% CI: 1.52-4.07; P<0.01) increased risk of CBP for individuals carrying genotypes of hMTH1 83Val/Met+Met/Met and hOGG1 326Cys/Cys, respectively. Compared with individuals carrying genotypes of hOGG1 326Cys/Cys and hMYH 324His/His at the same time, there was a 0.33-fold (OR(adj), 0.33; 95% CI: 0.15-0.72; P<0.05) decreased risk of CBP for those with genotypes of hOGG1 326Ser/Cys+Ser/Ser and hMYH 324His/Gln+Gln/Gln. In the smoking group, there was a 0.15-fold (OR(adj), 0.15; 95% CI, 0.03-0.68; P=0.01) decreased risk of CBP for subjects carrying genotypes of hMYH 324His/Gln+Gln/Gln compared with those of genotype of hMYH 324His/His. Therefore, our results suggested that polymorphisms at codons 83 of hMTH1 and codon 326 of hOGG1 might contribute to CBP in a Chinese occupational population.

Genetic polymorphisms in CYP1A1, CYP2D6, UGT1A6, UGT1A7, and SULT1A1 genes and correlation with benzene exposure in a Chinese occupational population.

Metabolic enzymes involved in benzene activation or detoxification, including cytochrome P-450 1A1 (CYP1A1), cytochrome P-450 2D6 (CYP2D6), UDP-glucuronosyltransferase 1A6 (UGT1A6), UDP-glucuronosyltransferase1A7 (UGT1A7), and sulfotransferase 1A1 (SULT1A1), were studied for their roles in human susceptibility to benzene poisoning. All 304 subjects were investigated with a unitary questionnaire and their DNA was isolated from blood samples by a routine phenol-chloroform extraction. The study included 152 benzene poisoning patients, and 152 control workers occupationally exposed to benzene in South China. The genotypes were determined by polymerase chain reaction-restricted fragment length polymorphism (PCR-RFLP) technique with genomic DNA. No individuals had the CYP 2D6 c.212 G>A variant alleles in this study. There is no association between the UGT1A6 c.181 T>A, UGT1A7 c.208 Trp>Arg, and SULT1A1 c.638 G>A genotypes and increased risk of benzene-induced carcinogenesis. Although most of the CYP2D6 haplotypes did not show any significant difference, the CYP2D6 haplotype CYP2D6 c.188 C/C, C/T, and c.4268 C/C was significantly overrepresented in the case group (OR 4.02, 95% CI: 2.53-6.39) compared with in controls. Overall, our data suggested that individuals with CYP1A1 c.5639 T/T, CYP2D6 c.188 C/C, C/T, and CYP2D6 c.4268 C/C genotypes tend to be more susceptible to benzene toxicity.

[Relationship between single nucleotide polymorphisms of NRAMP1 gene and susceptibility to pulmonary tuberculosis in workers exposed to silica dusts].

OBJECTIVE: To explore the relationship between polymorphisms of natural resistance-associated macrophage protein 1 (NRAMP1) gene and genetic susceptibility of pulmonary tuberculosis (PTB) in workers exposed to silica dusts. METHODS: A 1:2 case control study of 61 male workers with PTB (50 silicosis patients and 11 unsilicosis workers) as the case group and 122 male PTB-free workers (100 silicosis patients and 22 unsilicosis workers) as the control group was conducted with the frequency matched for age of +/- 5 years, the job, the silica exposure, and the condition of cigarette smoking and alcohol drinking. The polymerase chain reaction-restrained fragment length polymorphism technique (PCR-RFLP) was used to detect the single nucleotide polymorphisms (SNPs) of NRAMP1 INT4 and D543N. RESULTS: There was a 2.73 times (95% CI: 1.32 approximately 5.64) increased risk of silicosis for individuals with C allele of NRAMP1 INT4 compared with individuals carrying homozygote (G/G), while SNPs of NRAMP1 D543N was not associated with PTB (P > 0.05). CONCLUSION: The G > C mutation of intron 4 of NRAMP1 gene might be a susceptible factor of silica for the workers exposed to PTB.

[Genetic polymorphism of CYP-1A1, CYP2D6 and risks of chronic benzene poisoning].

OBJECTIVE: To explore the relationship between genetic polymorphisms of CYP-1A1 and CYP2D6 and risks of chronic benzene poisoning (BP). METHODS: A case control study was conducted. 152 BP patients and 152 workers occupationally exposed to benzene without poisoning manifestations were involved. Polymerase chain reaction followed by restriction fragment length polymorphism (PCR-RFLP) technology was used for detecting the single nucleotide polymorphisms (SNPs) of MspI in the non-coding region of CYP-1A1 gene and c.188, g.212 position in the first extron of CYP2D6 gene. RESULTS: The individuals with CYP1A1 MspI T/T genotype had a 1.32 times (95% CI: 1.05 approximately 1.65, P = 0.02) increased risk of BP compared with those carrying T/C and C/C genotypes. In no-smoking population, there was a 1.56 times (95% CI: 1.15 approximately 2.12, P = 0.003) increased risk of BP for subjects carrying CYP1A1 MspIT/T genotype compared with those carrying T/C and C/C genotypes. The individuals carrying CYP2D6 c.188 C/C or C/T genotype had a 1.23 times (95% CI: 1.05 approximately 1.42, P = 0.01) increased risk compared with those carrying T/T genotypes. In no-smoking population, there was a 1.23 times (95% CI: 1.04 approximately 1.47, P = 0.01) increased risk of BP for subjects carrying CYP2D6 c.188 C/C or C/T genotypes compared with those carrying T/T genotype. The single nucleotide polymorphism of g.212 position in the first extron of CYP2D6 gene had not been validated. CONCLUSION: The individuals with CYP2D6 c.188 C/C, CYP2D6 c.188 C/T and CYP1A1 MspIT/T genotypes tend to be more susceptible to benzene toxicity.

[Relationship between genetic polymorphism in hMTH1c.83, hOGG1c.326 and hMYHc.335 and risks of chronic benzene poisoning].

OBJECTIVE: To explore the relationship between genetic polymorphisms in hMTH1, hOGG1 and hMYH and risks of chronic benzene poisoning (CBP). METHODS: A case control study was conducted. One hundred and fifty-two BP patients and 152 workers occupationally exposed to benzene without poisoning manifestations were investigated. The polymerase chain reaction restrained fragment length polymorphism technique (PCR-RFLP) was applied to detect the single nucleotide polymorphisms (SNPs) on c.83 of hMTH1 gene, c.326 of hOGG1 gene and c.335 of hMYH gene. RESULTS: There were 2.51 times (OR(adj) = 2.51, 95% CI: 1.14-5.49, P = 0.02) and 2.49 times (OR(adj) = 2.49, 95% CI: 1.52-4.07, P < 0.01) risks of BP for individuals carrying genotypes of hMTH1c.83Val/Met + Met/Met or hOGG1c.326Cys/Cys compared with individuals carrying genotypes of hMTH1c.83Val/Val or hOGG1c.326Ser/Cys + Ser/Ser, respectively. Compared with individuals carrying genotypes of hOGG1c.326Cys/Cy and hMYHc.335 is/His at the same time, there was 0.33 times (OR(adj) = 0.33, 95% CI = 0.15-0.72, P = 0.01) risks of BP for these with genotypes of hOGG1c.326Ser/Cys + Ser/Ser and hMYHc.335His/Gln + Gln/Gln simultaneously. In the smoking group, there was 0.15 times (OR(adj) = 0.15, 95% CI: 0.03-0.68, P = 0.01) risks of BP for subjects carrying genotypes of hMYHc.335His/Gln + Gln/Gln compared with these carrying genotypes of hMYHc.335His/His. CONCLUSION: Polymorphisms of hMTH1 Val83 Met and hOGG1 Ser326Cys may contribute to altered risks of CBP, and potential interaction may exist among polymorphisms of hOGG1 Ser326Cys and hMYH His335Gln.

[Relation of genetic polymorphism of XRCC1 with risks of chronic benzene poisoning].

OBJECTIVE: To explore the relation between genetic polymorphisms in XRCC1 and risks of chronic benzene poisoning (BP). METHODS: A case-control study was conducted. 152 BP patients and 152 workers occupationally exposed to benzene without poisoning manifestations were investigated. PCR-RFLP was applied to detect the single nucleotide polymorphisms (SNPs) on c.194, c.280 and c.399 of XRCC1 gene. RESULTS: The proportion of XRCC1 c.194Arg/Trp + Trp/Trp genotypes in the case group was lower than that of the control group, while there was a higher proportion for XRCC1 C.280Arg/His + His/His in the case group. There was a 1.67-fold decreased risk of BP for individuals carrying XRCC1 C.194Arg/Trp + Trp/Trp genotypes (OR adj = 0.60, 95% CI: 0.37-0.97, P = 0.039) compared with subjects carrying Arg/Arg allele, and individuals carrying genotypes of XRCC1 C.280Arg/His + His/His had a 1.91-fold increased risk of BP compared with these carrying the wild allele (OR adj = 1.91, 95% CI: 1.17-3.10, P = 0.009). CONCLUSION: The risk of BP for subjects carrying XRCC1 c.194Arg/Trp + Trp/Trp genotypes may decrease while for individuals carrying XRCC1 c.280Arg/His + His/His genotypes may increase.

[Relationship of genetic polymorphism of microsomal epoxide hydrolase with susceptibility of chronic benzene poisoning].

OBJECTIVE: To explore the relationship between genetic polymorphisms of microsomal epoxide hydrolase (mEH) and susceptibility of chronic benzene poisoning (BP). METHOD: A case-control study was conducted. 152 BP patients and 152 workers occupationally exposed to benzene without poisoning manifestations were investigated. Polymerase chain reaction-restrained fragment length polymorphism technique (PCR-RFLP) was applied to detect the single nucleotide polymorphisms (SNPs) on c.113 and c.139 of mEH gene. RESULTS: The risk of BP for individuals carrying mEHc.113 C/C genotype was 0.60 (OR = 0.60, 95% CI: 0.37 - 0.97, P = 0.04) of those carrying T/T and T/C genotypes. In non-smoking population, the risk of BP for subjects carrying mEHc.113 C/C genotype was 0.56 (OR = 0.56, 95% CI: 0.33 - 0.96, P = 0.03) of those carrying T/T and T/C genotypes, and in non-drinking population, the individuals carrying mEHc.113 C/C genotype was 0.51 (OR = 0.51, 95% CI: 0.30 - 0.86, P = 0.01) of those carrying T/T and T/C genotypes. CONCLUSION: The subjects carrying mEHc.113 C/C genotype and together with non-smoking or non-drinking habit may have lower risk of chronic benaene poisoning.