Application of the CRISPR/Cas system in gene editing and nucleic acid detection of parasitic diseases: a review / 中国血吸虫病防治杂志

CRISPR/Cas system, an adaptive immune system with clustered regularly interspaced short palindromic repeats, may interfere with exogenous nucleic acids and protect prokaryotes from external damages, is an effective gene editing and nucleic acid detection tools. The CRISPR/Cas system has been widely applied in virology and bacteriology; however, there is relatively less knowledge about the application of the CRISPR/Cas system in parasitic diseases. The review summarizes the mechanisms of action of the CRISPR/Cas system and provides a comprehensive overview of their application in gene editing and nucleic acid detection of parasitic diseases, so as to provide insights into future studies on parasitic diseases.

Study on original identification of Rhei Radix et Rhizoma decoction pieces based on electronic sensory system and GC-IMS technology / 中国药房

OBJECTIVE To investigate the variations in taste， aroma and volatile organic compounds of Rhei Radix et Rhizoma decoction pieces derived from different sources， and to identify their origins. METHODS The flavor， odor and volatile organic compounds of Rhei Radix et Rhizoma decoction pieces from different sources were compared and analyzed by using electronic tongue， electronic nose， and gas chromatography-ion mobility spectrometry （GC-IMS）. Principal component analysis （PCA）， partial least squares-discriminant analysis （PLS-DA）， orthogonal partial least squares discriminant analysis （OPLS-DA） and Fisher discriminant analysis were employed to identify the origins of Rhei Radix et Rhizoma decoction pieces and establish the basis discrimination criteria. RESULTS The differences in taste of Rhei Radix et Rhizoma decoction pieces from 3 origins were primarily characterized by bitterness， astringency， and bitter-astringent aftertaste. In terms of smell， variations were mainly observed in inorganic sulfides， organic sulfides containing aromatic components， methane and other short-chain alkanes， alcohols， ethers， aldehydes and ketones， as well as nitrogen oxides. Differentially volatile organic compounds mainly consisted of alcohols， aldehydes and ketones. Furthermore， the samples from 8 batches could be effectively classified into 3 categories.Three types of Rhei Radix et Rhizoma decoction pieces can be effectivily identified based on the peak intensity ratio between volatile substances. For example， when the peak intensity of 2-acetylfuran was 3-19 times that of isobutyric acid [dimer]， it was considered as Rheum officinale Baill. CONCLUSIONS The discriminant models established in this study， along with the criteria for determining the origins based on the peak intensity ofcharacteristic volatile compounds， can be utilized for the identification of Rhei Radix et Rhizoma decoction pieces.

Exploring the Central Mechanism of Acupoint Catgut Embedding Therapy in Treating Rats with Diet-Induced Obesity Based on Hypothalamic LepR-Mediated JAK2/STAT3 Pathway / 广州中医药大学学报

Objective To observe the effects of acupoint catgut embedding therapy on body mass,lipid metabolism,serum leptin and mRNA and protein expressions of hypothalamic leptin receptor(LepR)-mediated Janus kinase 2(JAK2)/signal transducer and activator of transcription 3(STAT3)pathway in rats with diet-induced obesity(DIO).Methods Forty male SD rats were randomly divided into 10 in normal group and 30 in modeling group.A high-fat diet was used to establish the DIO rat model.After successful modeling,the modeled rats were randomly divided into the model group,the acupoint catgut embedding group and the acupoint catgut embedding + AG490(JAK2/STAT3 pathway blocker)group,with 10 rats in each group.The acupoint catgut embedding group and the acupoint catgut embedding + AG490 group were embedded on day(s)1,8,15 and 22 after successful modeling,the acupoints were selected from the Zhongwan(RN12),Shuidao(ST28),Tianshu(ST25),Pishu(BL20),Weishu(BL21),Sanjiaoshu(BL22)with a total of 4 treatments,and the acupoint catgut embedding + AG490 group was injected intraperitoneally with 1 mg/kg of AG490 every day during the treatment period;the normal group and the model group were only grasped and fixed.Body mass was measured before and after treatment.Lipid metabolism indexes of triglyceride(TG),total cholesterol(TC),low-density lipoprotein cholesterol(LDL-C),high-density lipoprotein cholesterol(HDL-C),and serum leptin levels were measured after treatment,and the mRNA expressions of hypothalamus LepR,JAK2 and STAT3 were detected by real-time quantitative polymerase chain reaction(RT-PCR),and the protein expressions of hypothalamus LepR,JAK2 and STAT3 were detected by Western Blot.Results Before treatment,compared with the normal group,the body mass of the model group,the acupoint catgut embedding group,and the acupoint catgut embedding+AG490 group were all elevated(P＜0.01),and compared with the model group,there was no significant difference in the body mass between the acupoint catgut embedding group and the acupoint catgut embedding+AG490 group(P＞0.05).After treatment,compared with the normal group,body mass,leptin and TG,TC,LDL-C levels were increased,and mRNA and protein expression levels of LepR,JAK2,STAT3 were decreased in the model group(all P＜0.01);compared with the model group,body mass,leptin and TG,TC,LDL-C levels were decreased in the acupoint catgut embedding group,and mRNA and protein levels of LepR,JAK2,STAT3 were increased in the acupoint catgut embedding + AG490 group(all P＜0.01);compared with the acupoint catgut embedding + AG490 group,the body mass,leptin and TG,TC,LDL-C levels were decreased,and mRNA and protein levels of LepR,JAK2,STAT3 were increased in the acupoint catgut embedding group(P＜0.05 or P＜0.01).Conclusion Acupoint catgut embedding has a good effect on weight loss and lipid reduction in DIO rats,and its central mechanism may be related to the down-regulation of serum leptin level and activation of hypothalamic LepR-mediated JAK2/STAT3 pathway.

Morphological study on gray matter volume changes of short-term withdrawal therapy in patients with alcohol use disorder / 实用放射学杂志

Objective To explore the changes in brain structure after short-term withdrawal therapy in patients with alcohol use disorder(AUD).Methods A total of 28 male patients with AUD were included,and brain MRI scans were performed at the time of enrollment and 2-3 weeks after standardized treatment.The total volume of brain tissue,gray matter,white matter and cerebrospi-nal fluid volume before and after treatment were measured by voxel-based morphometry(VBM)technology,and the gray matter volume of each brain region of the whole brain was measured and statistically analyzed according to the automated anatomical labeling(AAL)template.Results Compared with the baseline data,after 2-3 weeks of standardized treatment,the volume of gray matter in brain tissue increased significantly,and the volume of cerebrospinal fluid decreased significantly.Compared with before treatment,the brain regions with increased gray matter volume in the left hemisphere were distributed in the medial and paracingulate gyrus,central sulcus cover,anterior wedge lobe and insula,and the brain regions with increased gray matter volume in the right hemisphere were distributed in the anterior cingulate gyrus,paracingulate gyrus,central sulcus cover,amygdala,superior temporal gyrus,middle temporal gyrus,transverse temporal gyrus,anterior cuneiformus,posterior central gyrus,superior marginal gyrus,peritaloid cortex and insula.Conclusion Patients with AUD experience some increases in gray matter volume,especially in the prefrontal lobe,after short-term withdrawal therapy.

Correlation of circumference and displacement of the third fracture fragment with the healing of femoral shaft fractures treated with intramedullary nailing / 中国组织工程研究

BACKGROUND:After the treatment of femoral shaft fracture with the intramedullary nail,the third fracture open reduction indications are controversial.Some scholars believe that limited open reduction can achieve anatomical reduction,conducive to fracture healing;but some scholars believe that no open reduction of the third fracture still has a high fracture healing rate. OBJECTIVE:To investigate the effect of the circumference and displacement of the third fragment on fracture healing after intramedullary nailing of femoral shaft fractures with the third fragment. METHODS:A retrospective cohort study was conducted to analyze the clinical data of 142 patients suffered a femoral shaft fracture with a third fragment admitted to the Affiliated Lianyungang Hospital of Xuzhou Medical University from February 2016 to December 2021.The fracture were classified into three types according to the circumference of the third fracture with reference to the diaphyseal circumference at the fracture site:type 1 in 71 cases,type 2 in 52 cases,and type 3 in 19 cases.Referring to the diaphyseal diameter,the fractures were classified into three degrees according to the degree of the third fragment displacement:degree I in 95 cases,degree II in 31 cases,and degree III in 16 cases.All patients were treated with femoral interlocking intramedullary nails,and no intervention was performed for the displaced third fragment during the operation.Postoperative follow-up was performed to compare the fracture healing rate,healing time,and the modified Radiographic Union Scale for Tibia at month 9 after surgery in each group.The effect of third fracture fragment circumference and degree of displacement on fracture healing was assessed. RESULTS AND CONCLUSION:(1)All 142 patients were followed up for at least 12 months,with a mean of(14.7±4.1)months,and the overall healing rate was 73.4%.(2)When the third fragment was displaced by degree I,the healing rate,healing time,and modified Radiographic Union Scale for Tibia score at month 9 were not statistically significant among the three sub-groups of circumference classification.(3)When the third fragments were displaced by degree II or III,the healing rate and healing time were not statistically significant among the three subgroups of circumference classification;the modified Radiographic Union Scale for Tibia score at month 9 in the type 1 group was higher than that in the type 2 and 3 groups(P = 0.017).(4)Logistic regression analysis showed that a greater third fragment displacement and circumference were associated with lower fracture healing rates(P<0.05).(5)These findings indicate that in the treatment of femoral shaft fractures with third fragment by intramedullary nails,when the fracture fragment is displaced to degree I,the circumference size has little effect on fracture healing,and no intervention is required during surgery.When the third fragment is displaced to degree II or III and the circumference of which is type 1,a higher modified Radiographic Union Scale for Tibia score can still be obtained with no intervention of the third fragment.However,when the circumference is of type 2 or type 3,it significantly affects the fracture healing.Consequently,intraoperative intervention to reduce the distance of displacement of the fragment is required to lower the incidence of nonunion.The displacement of the third fracture fragments has a greater impact on fracture healing than their circumference.

Fault maintenance of Senographe DS Digital Mammography System:2 case reports / 医疗卫生装备

The structural composition and working principle of Senographe DS Digital Mammography System were introduced.The causes and elimination of 2 cases of faults of the system in exposure and artifact were proposed.References were provided for treating similar faults.[Chinese Medical Equipment Journal,2024,45(1):118-120]

Influencing Factors of Live Birth of Embryo Transfer After Hysteroscopic Adhesiolysis / 中国微创外科杂志

Objective To investigate the clinical factors affecting live birth rate in patients who underwent hysteroscopic adhesiolysis and subsequent embryo transfer.Methods A total of 643 patients who had undergone hysteroscopic surgery to remove various degrees of intrauterine adhesion(IUA)and subsequently received embryo transfer between January 2018 and December 2020 were retrospectively analyzed.Postoperative treatment regimens and pregnancy outcomes after embryo transfer were collected.The primary endpoint was live birth rate.A multivariate logistic regression analysis was performed to further investigate the factors affecting pregnancy outcomes.Results Among the 643 IUA patients,20.5%(132/643)patients were diagnosed as having mild IUA,63.6%(409/643)patients moderate IUA,and15.9%(102/643)patients severe IUA.The median time from hysteroscopy to the first cycle of embryo transfer was 126(73,225)d.The clinical pregnancy rate was 32.7%(210/643)and the live birth rate was 24.7%(159/643).Logistic regression analysis found that age(OR =0.926,95%CI:0.880-0.974,P =0.003)and endometrial thickness on the day of transplantation(OR =1.188,95%CI:1.030-1.370,P =0.018)were prognostic factors of live birth.The live birth rate significantly decreased with age in the mild and moderate adhesion groups(P =0.004 and 0.018),while in the severe adhesion group,the live birth rate decreased with age,but the difference was not significant(P =0.526).Postoperative estrogen dosage,number of artificial cycles,interval between hysteroscopy and transplantation,fresh or frozen-thawed embryo transfer,and type of embryo transferred had no significant impact on live birth.Conclusions Maternal age and endometrial thickness on the day of transplantation are the most important predictors of live birth in patients undergoing embryo transfer after hysteroscopic adhesiolysis.Fresh or frozen-thawed embryo transfer after surgery and the interval between hysteroscopy and transplantation do not affect the live birth rate.

A clinical and electrodiagnostic study of peripheral neuropathy in prediabetic patients / 中华神经科杂志

Objective:To explore the clinical and electrophysiological characteristics of peripheral neuropathy in prediabetic patients.Methods:Subjects aged 20-65 years with high-risk factors of impaired glycemia enrolled in Beijing Tiantan Hospital, Capital Medical University from 2019 to 2022 were recruited to conduct oral glucose tolerance test, after excluding other causes of neuropathy or radiculopathy. Patients with impaired fasting glucose or impaired glucose tolerance were defined by American Diabetes Association criteria. These patients were divided into clinical polyneuropathy (PN) and clinical non-PN groups, according to the 2010 Toronto consensus criteria and the presence of PN symptoms and signs or not. Nerve conduction studies (NCS), F wave, sympathetic skin response (SSR), R-R interval variation (RRIV) and current perception thresholds (CPT) were performed and the abnormal rate was compared between different electrodiagnostic methods and between clinical subgroups.Results:Among the 73 prediabetic patients ultimately enrolled, only 20 (27.4%) can be diagnosed as clinical PN according to the Toronto consensus criteria. The abnormal rate of CPT (68.5%, 50/73) was significantly higher than those of F wave (2.7%, 2/73), lower limb NCS (0, 0/73), upper limb NCS changes of carpal tunnel syndrome (26.0%, 19/73), SSR (6.8%, 5/73) and RRIV (5.5%, 4/73; McNemar test, all P<0.001). With sinusoid-waveform current stimuli at frequencies of 2 000 Hz, 250 Hz and 5 Hz, the CPT device was used to measure cutaneous sensory thresholds of large myelinated, small myelinated and small unmyelinated sensory fibers respectively. CPT revealed a 21.9% (16/73) abnormal rate of unmyelinated C fiber in the hands of prediabetic patients, significantly higher than that of large myelinated Aβ fibers [8.2% (6/73), χ2=5.352, P=0.021]. Both abnormal rates of small myelinated Aδ [42.5% (31/73)] and unmyelinated C fibers [39.7% (29/73)] in the feet of prediabetic patients were significantly higher than that of large myelinated Aβ fibers [11.0% (8/73), χ2=18.508, 15.965, both P<0.001]. Compared with the clinical non-PN group, the abnormal rates of CPT [90.0% (18/20) vs 60.4% (32/53), χ2=5.904, P=0.015] and SSR [20.0% (4/20) vs 1.9% (1/53), P=0.016) were significantly higher in the clinical PN group. Conclusions:Peripheral neuropathies in prediabetic patients are usually asymptomatic or subclinical, and predispose to affect unmyelinated and small myelinated sensory fibers. Selective electrodiagnostic measurements of small fibers help to detect prediabetic neuropathies in the earliest stages of the disease.

Rudimentary horn pregnancy: clinical analysis of 12 cases and literature review / 中华妇产科杂志

Objective: To investigate the clinical characteristics, treatments and fertility recovery of rudimentary horn pregnancy (RHP). Methods: The clinical data of 12 cases with RHP diagnosed and treated in Peking University Third Hospital from January 1, 2010 to December 31, 2022 were retrospectively analyzed. Clinical informations, diagnosis and treatments of RHP and the pregnancy status after surgery were analyzed. Results: The median age of 12 RHP patients was 29 years (range: 24-37 years). Eight cases of pregnancy in residual horn of uterus occurred in type Ⅰ residual horn of uterus, 4 cases occurred in type Ⅱ residual horn of uterus; among which 5 cases were misdiagnosed by ultrasound before surgery. All patients underwent excision of residual horn of uterus and affected salpingectomy. After surgery, 9 patients expected future pregnancy, and 3 cases of natural pregnancy, 2 cases of successful pregnancy through assisted reproductive technology. Four pregnancies resulted in live birth with cesarean section, and 1 case resulted in spontaneous abortion during the first trimester of pregnancy. No uterine rupture or ectopic pregnancy occurred in subsequent pregnancies. Conclusions: Ultrasonography could aid early diagnosis of RHP while misdiagnosis occurred in certain cases. Thus, a comprehensive judgment and decision ought to be made based on medical history, physical examination and assisted examination. Surgical exploration is necessary for diagnosis and treatment of RHP. For infertile patients, assisted reproductive technology should be applied when necessary. Caution to prevent the occurrence of pregnancy complications such as uterine rupture, and application of cesarean section to terminate pregnancy are recommended.

Research progress on the mechanism of retinal light injury / 国际眼科杂志(Guoji Yanke Zazhi)

The retina is a highly specialized tissue with unique structure and adaptability. Maintaining dynamic balance in all different types of retinal cells is essential for maintaining vision. The retina may be exposed to a variety of environmental damage such as light-induced damage, and over the course of evolution, retinal cells have developed adaptive responses to various injuries that together restore dynamic cellular homeostasis and increase the resistance of the tissue to further damage. Howecer, excessive exposure to light can cause a series of pathological changes in photoreceptors, retinal ganglion cells(RGC), retinal glial cells and retinal pigment epithelium(RPE)cells, such as increased expression of reactive oxygen species(ROS)and Ca2+ in mitochondria, apoptosis, endoplasmic reticulum stress, autophagy and inflammation, etc., leading to irreversible damage to the retina. In the present article, the possible pathogenesis and current related research progress of light-induced injury were reviewed, in order to provide research directions for the prevention and treatment of retinal light injury.

Chronic Injury of Mice Bone Marrow Multipotent Hematopoietic Progenitor Cells Induced by Ionizing Radiation / 中国实验血液学杂志

OBJECTIVE@#To explore the chronic injury and its possible mechanism of ionizing radiation on multipotent hematopoietic progenitor cells (MPPs) by determining the related indicators of MPPs in bone marrow of mice post-radiation.@*METHODS@#Sixteen C57BL/6 adult mice were randomly divided into normal control and irradiation groups, 8 mice in each group. The mice in irradiation group were exposed to 6 Gy X-ray. The proportion of bone marrow MPPs, their apoptosis and proliferation 2 months after irradiation were detected by flow cytometry. Mitochondrial activity and levels of reactive oxygen species (ROS) in each MPPs population were detected by Mitotracker Red and DCFDA probes, and the senescent state of MPPs in the bone marrow was analyzed.@*RESULTS@#Ionizing radiation could reduce the proportion of MPPs in mouse bone marrow. The proportions and numbers of MPP1, MPP3 and MPP4 in the bone marrow were significantly decreased after whole-body irradiation with 6 Gy X-ray (P<0.05). In addition, radiation significantly reduced the colony-forming capacity of MPPs in bone marrow (P<0.05), the proportions of apoptotic cells in the MPP1 and MPP4 cell populations increased significantly in the bone marrow (P<0.05). The activity of mitochondria was significantly reduced in the bone marrow MPP2, MPP3 and MPP4 cell populations compared with that of the control group (P<0.05). It was also found that the radiation could significantly increase the ROS levels of MPPs in bone marrow, and the content of ROS in the MPP2, MPP3 and MPP4 cell population of the bone marrow was significantly increased(P<0.05). The senescent cells ratios of MPP1, MPP3 and MPP4 cells in the bone marrow after irradiation were significantly higher than those in the control group (P<0.05).@*CONCLUSION@#Ionizing radiation can cause chronic MPPs damage in mice, which is closely associated with persistent oxidative stress, cells apoptosis, and cellular senescence.

GSDMD in peripheral myeloid cells regulates microglial immune training and neuroinflammation in Parkinson's disease

Peripheral bacterial infections without impaired blood-brain barrier integrity have been attributed to the pathogenesis of Parkinson's disease (PD). Peripheral infection promotes innate immune training in microglia and exacerbates neuroinflammation. However, how changes in the peripheral environment mediate microglial training and exacerbation of infection-related PD is unknown. In this study, we demonstrate that GSDMD activation was enhanced in the spleen but not in the CNS of mice primed with low-dose LPS. GSDMD in peripheral myeloid cells promoted microglial immune training, thus exacerbating neuroinflammation and neurodegeneration during PD in an IL-1R-dependent manner. Furthermore, pharmacological inhibition of GSDMD alleviated the symptoms of PD in experimental PD models. Collectively, these findings demonstrate that GSDMD-induced pyroptosis in myeloid cells initiates neuroinflammation by regulating microglial training during infection-related PD. Based on these findings, GSDMD may serve as a therapeutic target for patients with PD.

Re-discussion on the comprehensive treatment strategy of complex ventral hernia from the perspective of intraperitoneal pressure / 中华外科杂志

Complex ventral hernia refers to a large hernia that is complicated by a series of concurrent conditions. Change in intra-abdominal pressure is one of the main pathways through which various factors exert an impact on perioperative risk and postoperative recurrence. Taking abdominal pressure reconstruction as the core, the treatment strategy for complex abdominal hernia can be formulated from three aspects: improving patients' tolerance, expanding abdominal cavity volume, and reducing the volume of abdominal contents. Improving patients' tolerance includes abdominal wall compliance training and progressive preoperative pneumoperitoneum. To expand the volume of the abdominal cavity, implanting hernia repair materials, component separation technique, autologous tissue transplantation, component expend technique, and chemical component separation can be used. Initiative content reduction surgery and temporary abdominal closure may be performed to reduce the volume of abdominal contents. For different cases of complex ventral hernia, personalized treatment measures can be safely and feasibly adopted depending on the condition of the patients and the intra-abdominal pressure situation.

Clinical effect of acupuncture based on syndrome differentiation in the treatment of chronic insomnia and its influence on cognitive function / 中国针灸

OBJECTIVE@#To compare the effect of acupuncture based on syndrome differentiation and estazolam in the treatment of chronic insomnia and its influence on cognitive function.@*METHODS@#A total of 90 patients with chronic insomnia were randomly divided into an acupuncture group and a medication group, 45 cases in each group. The acupuncture group was treated with acupuncture at Sishencong (EX-HN 1) and bilateral Shenmen (HT 7), Sanyinjiao (SP 6) combined with compatibility of acupoints based on syndrome differentiation, once a day for 6 d and then rest for 1 d, for a total of 4 weeks. The medication group was treated with oral estazolam tablets before bedtime, 1 tablet each time, for a total of 4 weeks. Before and after treatment, the scores of Pittsburgh sleep quality index (PSQI), mini-mental state examination (MMSE), Montreal cognitive assessment (MoCA) and auditory verbal memory test (AVMT) of the two groups were compared, and the effects were evaluated.@*RESULTS@#After treatment, the PSQI sub-item scores and total scores of the two groups were lower than those before treatment ( P<0.05 ), and above scores in the acupuncture group were lower than those in the medication group ( P<0.05 ); the scores of MMSE, MoCA and AVMT in the two groups were higher than those before treatment ( P<0.05 ), and the scores in the acupuncture group were higher than those in the medication group ( P<0.05 ). The total effective rate of the acupuncture group was 80.0% (36/45), which was higher than 53.3% (24/45) in the medication group (P<0.05).@*CONCLUSION@#Syndrome differentiation acupuncture can improve the sleep quality and cognitive function of patients with chronic insomnia, and the curative effect is better than that of estazolam.

Application progress of high-throughput sequencing in antiphospholipid syndrome / 中华预防医学杂志

Antiphospholipid syndrome (APS) is characterized by arterial and venous thrombosis and(or) morbid pregnancy, accompanied by persistent antiphospholipid antibody (aPL) positivity. However, due to the complex pathogenesis of APS and the large individual differences in the expression of aPL profiles of patients, the problem of APS diagnosis, prognosis judgment and risk assessment may not be solved only from antibody level. It is necessary to use new technologies and multiple dimensions to explore novel APS biomarkers. The application of next generation sequencing (NGS) technology in diseases with high incidence of somatic mutations, such as genetic diseases and tumors, has been very mature. Thus, gradually understanding the research and application progress of APS by NGS technology from genome, transcriptome, epigenome and other aspects is meaningful. This article reviews the related research of NGS technology in APS, and provide more reference for the deep understanding of the APS-related screening markers and disease pathogenesis.

Molecular dynamics simulation reveals DNA-specific recognition mechanism via c-Myb in pseudo-palindromic consensus of mim-1 promoter / 浙江大学学报（英文版）（B辑：生物医学和生物技术）

This study aims to gain insight into the DNA-specific recognition mechanism of c-Myb transcription factor during the regulation of cell early differentiation and proliferation. Therefore, we chose the chicken myeloid gene, mitochondrial import protein 1 (mim-1), as a target to study the binding specificity between potential dual-Myb-binding sites. The c-Myb-binding site in mim-1 is a pseudo-palindromic sequence AACGGTT, which contains two AACNG consensuses. Simulation studies in different biological scenarios revealed that c-Myb binding with mim-1 in the forward strand (complex F) ismore stable than that inthereverse strand (complex R). The principal component analysis (PCA) dynamics trajectory analyses suggested an opening motion of the recognition helices of R2 and R3 (R2R3), resulting in the dissociation of DNA from c-Myb in complex R at 330 K, triggered by the reduced electrostatic potential on the surface of R2R3. Furthermore, the DNA confirmation and hydrogen-bond interaction analyses indicated that the major groove width of DNA increased in complex R, which affected on the hydrogen-bond formation ability between R2R3 and DNA, and directly resulted in the dissociation of DNA from R2R3. The steered molecular dynamics (SMD) simulation studies also suggested that the electrostatic potential, major groove width, and hydrogen bonds made major contribution to the DNA‍-specific recognition. In vitro trials confirmed the simulation results that c-Myb specifically bound to mim-1 in the forward strand. This study indicates that the three-dimensional (3D) structure features play an important role in the DNA-specific recognition mechanism by c-Myb besides the AACNG consensuses, which is beneficial to understanding the cell early differentiation and proliferation regulated by c-Myb, as well as the prediction of novel c-Myb-binding motifs in tumorigenesis.

Diterpenoid constituents in Pseudolarix amabilis and their antitumor activities in vitro / 中国中药杂志

By various chromatographic techniques and extensive spectroscopic methods, 17 abietane diterpenoids were isolated from the dichloromethane fraction of the 95% ethanol cold-soak extracts of the seeds of Pseudolarix amabilis, namely pseudoamaol A(1), 12α-hydroxyabietic acid(2), 12-methoxy-7,13-abietadien-18-oic acid(3), 13-hydroxy-8,11,13-podocarpatrien-18-oic acid(4), 15-hydroxy-7,13-abietadien-12-on-18-oic acid(5), 8(14)-podocarpen-13-on-18-oic acid(6), holophyllin K(7), metaglyptin B(8), 7α-hydroxydehydroabietinsaure-methylester(9), 7-oxodehydroabietic acid(10), 15-hydroxy-7-oxodehydroabietinsaure-methy-lester(11), 15-methoxydidehydroabietic acid(12), 7-oxo-15-hydroxy-dehydroabietic acid(13), 15-hydroxydehydroabietic acid(14), 8,11,13-abietatriene-15,18-diol(15), 8,11,13-abietatriene-15-hydroxy-18-succinic acid(16), and 7β-hydroxydehydroabie-tic acid(17). Compound 1 was a new compound. The isolated compounds were evaluated for their antitumor activities(HepG2, SH-SY5Y, K562), and compounds 8 and 17 showed potential cytotoxic activity against K562 cells, with IC_(50) values of 26.77 and 37.35 μmol·L~(-1), respectively.

Detection and Analysis of Blood Dexmedetomidine in Drug-Facilitated Cases / 法医学杂志

OBJECTIVES@#To establish a simple and rapid qualitative and quantitative detection method of dexmedetomidine in blood.@*METHODS@#Blood was separated on the Allure PFP Propyl liquid chromatography column with isocratic elution after it was precipitated by acetonitrile and filtered. Qualitative and quantitative analysis of dexmedetomidine was performed using positive ion scan mode and multi-reaction monitoring mode.@*RESULTS@#The limit of detection of dexmedetomidine in blood was 0.2 ng/mL and the limit of quantification was 0.5 ng/mL. The linearity of the method was good in the range of 0.5-1 000 ng/mL, and the correlation coefficient was greater than 0.99. The accuracy of the method was 90.34%-112.67% and the extraction recovery was 50.05%-91.08%, with no significant matrix effect.@*CONCLUSIONS@#This method is simple, selective and suitable for the qualitative and quantitative analysis of dexmedetomidine in blood, which can provide a reference for drug-facilitated cases involving dexmedetomidine.

Effects of single-person hyperbaric chamber on hemodynamics of superior mesenteric artery in personnel rushing to extremely high altitude area / 医疗卫生装备

Objective To evaluate the effect of the single-person hyperbaric chamber on hemodynamics of superior mesenteric artery in the personnel rushing to the extremely high altitude area.Methods Sixty healthy young male subjects who traveled by car from the plains(890 m above sea level)to a very high altitude area(5 130 m above sea level)were randomly divided into a control group,a low-flow oxygen therapy group and a hyperbaric oxygen group,with 20 cases in each group.After entering the plateau area,no intervention was made in the control group;in the low-flow oxygen therapy group,low-flow oxygen therapy was performed once a day by means of nasal oxygen cannula(oxygen flow rate of 2 L/min,60 min/times);in the hyperbaric oxygen group,hyperbaric oxygen therapy was carried out once a day in a single-person hyperbaric oxygen chamber(pressuri-zation pressure of 0.25 MPa,60 min/times).The subjects in the three groups had their peak systolic velocity(PSV),resistance index(RI),and pulsation index(PI)of the main trunks of the SMAs and their grade 1 and 2 branches measured and compared using color Doppler ultrasound diagnostic instruments on days 30,60,and 90,respectively,after acute entry to the plateau.SPSS 19.0 software was used for statistical analysis.Results There were no significant differences in PSV,RI and PI of SMA and its 1 st and 2nd grade branches between the 3 groups 30 days after entry(P＞0.05).Sixty days after entry,the control group had the values of PSV statistically higher than those of the other two groups(P＜0.05);there were no significant differences between the low-flow oxygen therapy group and the hyperbaric oxygen group in the values of PSV(P＞0.05);the three groups had no obvious differences in the values of RI and PI(P＞0.05).Ninety days after entry,the control group had the values of PSV,RI and PI all significantly higher than those of the other two groups(P＜0.05);the low-flow oxygen therapy group had the values of PSV statistically higher than those of the hyperbaric oxygen group(P＜0.05),while the values of RI and PI not significantly different from those of the hyperbaric oxygen group(P＞0.05).Conclusion Single-person hyperbaric oxygen chamber significantly improves the SMA blood flow changes due to oxygen partial pressure reduction in the plateau,and thus is of significance for preventing ischemic enteropathy of the personnel rushing to the plateau.[Chinese Medical Equipment Journal,2023,44(10):59-63]

Preliminary Analysis of Influencing Factors of Opioid Analgesics Need Within 48 Hours After Arthroscopic Rotator Cuff Repair / 中国微创外科杂志

Objective To investigate the influencing factors of opioid analgesics need within 48 hours after arthroscopic rotator cuff repair.Methods Clinical data of 90 consecutive arthroscopic rotator cuff repairs by the same operator from March 2017 to July 2022 were retrospectively analyzed.The patients were divided into opioid group(62 patients)and control group(28 patients)according to whether they used opioid analgesics within 48 hours after surgery.The control group consisted of patients who did not use analgesics or who had good analgesic effects with conventional analgesic regimens(non-steroidal anti-inflammatory drugs or non-opioid central analgesics)after surgery,and the opioid group consisted of patients who required opioid analgesics as assessed by the surgeon or who need opioid analgesics because of inefficacy of conventional analgesic regimens.The following factors were selected as independent variables:gender,age(whether≥65 years old),duration of disease(whether≥4 weeks),body mass index(BMI)(whether≥25),occupation(whether employed),with or without a history of smoking and alcohol consumption,hypertension,diabetes,heart disease,and trauma,duration of surgery(whether≤180 min),number of torn tendons(whether≥2),number of screws(whether≥2),large nodular osteophyte,and whether there was moderate-to-severe impingement.Single factor analysis was used to screen the factors influencing the need for opioid analgesics within 48 hours after arthroscopic rotator cuff repair.Results The results of univariate analysis showed that among the above independent variables,only the number of torn tendons≥2 was the factor affecting the need for opioid analgesics within 48 hours after arthroscopic rotator cuff repair(OR = 5.263,P = 0.007).Conclusions Patients with rotator cuff tears with≥2 tendons had more severe pain within 48 hours after rotator cuff repair,requiring opioid analgesics.Focus should be placed on postoperative pain in such patients,and a diverse analgesic regimen should be used early.