Various teaching methods were used in occupational health and occupational medicine teaching,including problem based learning,multimedia teaching,bilingual teaching,case based learning and practice teaching methods when being confronted with new situation of occupational health and occupational safety.These methods are mean to encourage students' enthusiasm,cultivate students' comprehensive ability and enhance their sense of social responsibility and mission.Results showed that these methods improved the quality of teaching and achieved good teaching results.

[Objective]To explore the relationship between peripheral arterial disease(PAD)and diabetic retinopathy(DR)in type 2 diabetes patients.[Methods]A total of 99 patients diagnosed with PAD were classified into grade 1-3 by their total scores of peripheral arterial stenosis assessed by color doppler ultrasound examinations,where the degree of stenosis 30% ~ 49% scored 0, 50%~99%scored 1,lumen occlusion(i.e. degree of stenosis 100%)scored 2,and therefore the total score 0-2 was categorized into Grade 1 ,3~4 into Grade 2 ,5~12 into Grade 3. The bilateral anterior tibial artery ,posterior tibial artery and dorsalis pedis artery of these patients were analyzed. The presence of diabetic retinopathy(DR)was graded from retinal photographs using a standard protocol.[Results]Among 99 cases of type 2 diabetic patients with peripheral arterial disease ,58.6%of them were male with average age of 67.3 ± 7.9 years old. Patients of Grade 1,Grade2,Grade 3 lesion accounted for 45.4%,30.3%,24.2%,respectively. Age, gender,smoking history,SBP,DBP,BMI,FBG,TC,TG,LDL-C,HDL-C,HbA1C among 3 groups were not statistically signifi-cant. The associations of DM duration and HbA1C value were significantly larger in DR than in PAD. The proportion of DR patients increased with the severity degree of PAD(p for trend=0.004). Degree of stenosis Grade 2 and Grade 3 could be predictive for DR.[Conclusions]DR is associated with the severity degree of PAD in type 2 diabetes patients as evaluated by duplex ultrasonography.Degree of stenosis Grade 2 and 3 could be used for screening or finding DR. Strategies for optimum treatment and early prevention are needed.

Objective:To investigate the efficacy and pregnancy outcome of fertility-preserving treatment for patients with stage Ⅰa, grade 2 endometrial cancer (EC).Methods:Clinical data was retrospectively collected for EC or atypical endometrial hyperplasia (AEH) patients treated in Peking University People's Hospital, Foshan First People's Hospital of Guangdong Province and First Affiliated Hospital of Sun Yat-sen University, from 2010 to 2019. Inclusion criteria for fertility-preserving treatment included: (1) Age ≤45 years. (2) EC with histological differentiation of G 1, G 2 or endometrial AEH. (3) EC disease should be stage Ⅰa, confined to the endometrium without myometrial invasion, lymph node or extrauterine metastasis. Treatment regimen: patients were given oral progestin therapy and endometrial pathology was evaluated every three months. Patients were divided into three groups as G 2 EC group, G 1 EC group and AEH group based on the histological differentiation. Oncological and pregnancy outcomes were compared among them. Results:(1) Totally 57 eligible patients were included in this study, including 11 cases with G 2 EC, 22 cases with G 1 EC, and 24 cases with AEH. (2) Oncological outcome: among the three groups of G 2 EC, G 1 EC and AH, the complete remission rates (9/11, 91% and 96%, respectively) and recurrence rates (3/9, 30% and 22%, respectively) were not significantly different (all P>0.05). Median remission time was significantly longer in the G 2 EC group than those in the other two groups (8, 6 and 4 months; P=0.046). Among 9 G 2 EC patients who recurred after complete remission, three patients relapsed at 7, 18 and 53 months, respectively. All 3 patients chose fertility-sparing treatment again, and all achieved complete remission after retreatment. (3) Pregnancy outcome: among the three groups, the assisted reproduction technology rates (4/8, 5/18 and 36%, respectively) and pregnancy rates (6/8, 5/18 and 36%, respectively) had no significant difference ( P>0.05). However, time interval to pregnancy was shorter in G 2 EC patientsthan the other two groups (4, 9 and 22 months, respectively; P=0.006). Conclusions:Fertility-preserving treatment for patients with stageⅠa, G 2 endometrial cancer, may obtain a relatively high remission rate and an acceptable pregnancy rate. However, further exploration is needed due to the limited number of cases.

ObjectiveTo explore the effect and mechanism of Hei Xiaoyaosan in regulating the tumor necrosis factor receptor superfamily member 6 （Fas）/Fas ligand （FasL）/cysteine protease-8 （Caspase-8）/cysteine protease-3 （Caspase-3） signaling pathway to intervene in neuronal apoptosis and prevent Alzheimer's disease （AD）. MethodNinety SPF-grade SD male rats of 4 months old were selected and randomly grouped as follows： 10 rats in the blank group， 10 rats in the sham group （bilateral hippocampus injected with 1 μL normal saline）， and 70 rats in the modeling group ［bilater hippocampus injected with 1 μL amyloid-beta protein 1-42 （Aβ_1-42） solution for the modeling of AD］. Fifty successfully modeled rats were selected and randomly assigned into model， donepezil hydrochloride （0.45 mg·kg^-1）， and high-， medium-， and low-dose （15.30， 7.65， 3.82 g·kg^-1） Hei Xiaoyaosan groups. Rats were administrated with corresponding agents by gavage once a day for 42 days. Terminal-deoxynucleoitidyl transferase-mediated nick end labeling （TUNEL） was employed to observe the apoptosis of neurons in the cortex and hippocampus， and immunohistochemistry （IHC） was used to detect the expression of B-cell lymphoma-2 （Bcl-2） and Bcl-2-associated X protein （Bax） in the hippocampus. Real-time fluorescence quantitative polymerase chain reaction（Real-time PCR） was employed to determine the mRNA levels of Fas， FasL， and Fas-associated protein with death domain （Fadd）. Western blot was used to determine the protein levels of Fas， FasL， Fadd， Caspase-3， cleved Caspase-3， Caspase-8， and cleved Caspase-8. ResultCompared with the blank group and sham group， the model group showed increased apoptosis rate in the cortex and hippocampus （P<0.01）， elevated Bax level （P<0.01）， lowered Bcl-2 level （P<0.01）， up-regulated mRNA levels of Fas， FasL， and Fadd in the hippocampus （P<0.01）， and up-regulated protein levels of Fas， FasL， Fadd， cleaved Caspase-3， and cleaved Caspase-8 （P<0.01）. Compared with the model group， donepezil hydrochloride and Hei Xiaoyaosan at high and medium doses decreased the apoptosis rate in the cortex and hippocampus （P<0.05， P<0.01）， lowered the Bax level （P<0.01）， elevated the Bcl-2 level （P<0.01）， and down-regulated the mRNA levels of Fas， FasL， and Fadd and the protein levels of Fas， FasL， Fadd， cleaved Caspase-3， and cleaved Caspase-8 （P<0.05， P<0.01） in the hippocampus. Low-dose Hei Xiaoyaosan decreased the apoptosis rate in the cortex and hippocampus （P<0.05， P<0.01）， lowered the Bcl-2 level （P<0.01）， and down-regulated the mRNA levels of FasL and Fadd （P<0.05） and the protein levels of Fas， FasL， Fadd， cleaved Caspase-3， and cleaved Caspase-8 （P<0.05） in the hippocampus. ConclusionHei Xiaoyaosan can protect neurons in the cortex and hippocampus of AD rats by inhibiting the apoptosis mediated by the Fas/FasL/Caspase-8/Caspase-3 signaling pathway.

ObjectiveTo explore the effect and mechanism of Hei Xiaoyaosan in modulating the synaptic plasticity in APP/PS1 mice by regulating the cyclic adenosine monophosphate （cAMP）/protein kinase A （PKA）/N-methyl-D-aspartate receptor （NMDAR） signaling pathway. MethodTwelve 4-month-old male C57BL/6J mice were selected as the blank control group， and 60 4-month-old male APP/PS1 double transgenic mice were randomized into model， KW-6002 （adenosine receptor antagonist， 3 mg·kg^-1）， and high-， medium-， and low-dose （22.10， 11.05， 5.53 g·kg^-1， respectively） Hei Xiaoyaosan groups， with 12 mice in each group. Mice were administrated with corresponding drugs for 90 days. Transmission electron microscopy was employed to observe the synaptic ultrastructure of hippocampal neurons， and Golgi staining was used to observe the dendritic spine density of neurons in hippocampal CA1 region. Western blot was employed to measure the protein levels of cAMP， PKA， N-methyl-D-aspartate receptors 1， 2A， and 2B （NR1， NR2A， and NR2B， respectively）， postsynaptic density protein 95 （PSD95）， and synapsin 1 （SYN1）. Real-time fluorescence quantitative polymerase chain reaction（Real-time PCR） was performed to determine the mRNA levels of cAMP， PKA， and NR1. Enzyme-linked immunosorbent assay was employed to determine the content of interleukin-12 （IL-12） and interleukin-4 （IL-4） in the hippocampus. ResultCompared with the blank group， the model group showed blurred boundaries between presynaptic membrane and postsynaptic membrane in hippocampal CA1 region， reduced and scattered synaptic vesicles， and decreased density of postsynaptic membrane， and irregular， disarranged， and loosened dendritic spines of neurons in hippocampal CA1 region （P<0.01）. In addition， the model group presented down-regulated protein levels of cAMP， PKA， NR1， NR2A， NR2B， PSD95， and SYN1 and mRNA levels of cAMP， PKA， and NR1， elevated IL-12 level， and lowered IL-4 level in the hippocampus （P<0.01）. Compared with the model group， the drug intervention groups showed clear and intact boundaries between presynaptic membrane and postsynaptic membrane in hippocampal CA1 region， increased synaptic vesicles with dense arrangement， increased density of postsynaptic membrane， and improved morphology， arrangement， and density of neuronal dendritic spines （P<0.05， P<0.01）. In addition， the drug interventions up-regulated the protein levels of cAMP， PKA， NR1， NR2A， NR2B， PSD95， and SYN1 （P<0.05，P<0.01） and mRNA levels of cAMP， PKA， and NR1 （P<0.01）， lowered the IL-12 level （P<0.01）， and elevated the IL-4 level （P<0.01） in the hippocampus. ConclusionHei Xiaoyaosan can improve the structure and morphology of hippocampal neurons in APP/PS1 mice by activating the cAMP/PKA/NMDAR signaling pathway and repairing synaptic plasticity.

ObjectiveTo investigate the role and mechanism of Hei Xiaoyaosan in intervening in oxidative stress in the rat model of Alzheimer's disease （AD） via modulating the rat sarcoma （RAS）/rapidly accelerating fibrosarcoma （RAF）/mitogen-activated protein kinase kinase （MEK）/extracellular signal-regulated kinase （ERK） signaling pathway. MethodOne hundred 4-month-old SPF-grade Wistar male rats were randomly grouped as follows： 10 in the blank group， 10 in the sham group （bilateral hippocampus injected with 1 μL normal saline）， and 80 in the modeling group ［bilateral hippocampus injected with 1 μL amyloid beta protein 1-42 （Aβ_1-42） solution for the modeling of AD］. Fifty rats qualified for modeling were selected and randomized into the model， donepezil hydrochloride （0.5 mg·kg^-1）， and high-， medium-， and low-dose （15.30， 7.65， 3.82 g·kg^-1， respectively） Hei Xiaoyaosan groups. The rats were administrated with corresponding drugs by gavage once a day for 42 consecutive days. At the end of gavage， Morris water maze test was performed to examine the learning and memory abilities of the rats， and Nissl staining was used to observe the pathological changes of neurons in CA3 region of the hippocampus. The immunofluorescence assay was used to observe Aβ deposition and tau phosphorylation. Western blot was employed to determine the protein levels of RAS， RAF， phosphorylated （p）-RAF， MEK， p-MEK， ERK， and p-ERK in the hippocampal tissue. Biochemical methods were used to determine the levels of reactive oxygen species （ROS）， malondialdehyde （MDA）， and superoxide dismutase （SOD） in the hippocampal tissue. ResultCompared with the sham group， the model group showed prolonged escape latency （P<0.01）， shortened swimming distance in the target quadrant （P<0.01）， reduced and uneven stained Nissl bodies， enhanced fluorescence intensity of Aβ and p-tau （P<0.01）， up-regulated protein levels of RAS， p-RAF， p-MEK， and p-ERK in the hippocampal tissue （P<0.01）， increased ROS and MDA content （P<0.01）， and decreased SOD activity （P<0.01） on day 5. Compared with the model group， donepezil hydrochloride and high-， medium-， and low-dose Hei Xiaoyaosan shortened the escape latency （P<0.01）， increased the swimming distance in the target quadrant （P<0.01）， improved the arrangement， morphology， and structures of neurons and the number and distribution of Nissl bodies， decreased the fluorescence intensity of Aβ and p-tau （P<0.01）， up-regulated the protein levels of RAS， p-RAF， p-MEK， and p-ERK （P<0.05， P<0.01）， decreased the ROS and MDA content （P<0.01）， and increased the SOD activity （P<0.01） on day 5. ConclusionHei Xiaoyaosan may ameliorate oxidative stress， reduce Aβ and p-tau levels， and inhibit hippocampal neuronal damage by regulating the RAS/RAF/MEK/ERK signaling pathway， thus improving learning and memory abilities.

Alzheimer's disease （AD） is a neurodegenerative disease that predominantly affects the elderly. It belongs to the category of dementia in traditional Chinese medicine （TCM）， with the onset and progression closely associated with the functions of the kidney， liver， and spleen. The classic TCM formula Hei Xiaoyaosan， which regulates the three Yin of liver， spleen， and kidney， shows broad prospects in treating neurodegenerative diseases. This article reviews the experimental studies reported in the past decade to summarize the mechanisms of Hei Xiaoyaosan and its active components in intervening in AD. Hei Xiaoyaosan can treat AD via multiple targets， levels， and aspects comprehensively. The clinical studies have demonstrated that Hei Xiaoyaosan alone or in combination with other therapies has a definite therapeutic effect on AD. Specifically， it can ameliorate the cognitive impairment， mitigate oxidative stress， and inhibit the overexpression of soluble apoptotic factors in AD patients. This review aims to provide a theoretical basis for the treatment of AD with Hei Xiaoyaosan and explore new research directions. Moreover， it gives new insights into the clinical application of Hei Xiaoyaosan and the development of products with both medicinal and edible values.

ObjectiveTo explore the mechanism of Hei Xiaoyaosan in improving the cognitive function in Alzheimer's disease （AD） from cell apoptosis mediated by the phosphatidylinositol 3-kinase （PI3K）/protein kinase B （Akt）/nuclear factor kappa B （NF-κB） signaling pathway. MethodsFour-month-old SD male rats were randomly assigned into a blank group， a sham group， a model group， a donepezil hydrochloride （0.45 mg·kg^-1） group， and high-， medium-， and low-dose （15.30， 7.65， and 3.82 g·kg^-1， respectively） Hei Xiaoyaosan groups， with 10 rats in each group. The sham group received bilateral hippocampal injection of 1 μL normal saline， while the other groups received bilateral hippocampal injection of 1 μL beta-amyloid 1-42 （Aβ_1-42） solution for the modeling of AD. Rats were administrated with corresponding agents once a day for 42 consecutive days. The Morris water maze test was carried out to assess the learning and memory abilities of rats. Hematoxylin-eosin staining was employed to observe pathological changes in the hippocampus of rats. Enzyme-linked immunosorbent assay was employed to measure the levels of cysteinyl aspartate-specific proteinase-3 （Caspase-3）， B-cell lymphoma-2 （Bcl-2）， and Bcl-2-associated X protein （Bax）. Western blot was employed to determine the protein levels of PI3K， Akt， and NF-κB. A cell model of AD was established by co-culturing Aβ_1-42 and PC12 cells in vitro. Cell viability and apoptosis were detected by the cell-counting kit 8 （CCK-8） assay and flow cytometry （FC）， respectively. ResultsAnimal experiments showed that compared with the blank group， the model group had a prolonged escape latency （P<0.01）， a reduced number of crossing platforms （P<0.01）， disarrangement and a reduced number of hippocampal neurons， up-regulated expression of Bax and Caspase-3， down-regulated expression of Bcl-2 （P<0.01）， decreased p-PI3K/PI3K and p-Akt/Akt levels， and an increased p-NF-κB/NF-κB level （P<0.01）. Compared with the model group， donepezil hydrochloride and high- and medium-dose Hei Xiaoyaosan shortened the escape latency and increased the number of crossing platforms （P<0.05， P<0.01）， improved the arrangement and increased the number of hippocampal neurons， down-regulated the expression levels of Bax and Caspase-3， up-reguated the expression level of Bcl-2 （P<0.05， P<0.01）， increased the p-PI3K/PI3K and p-Akt/Akt levels （P<0.05， P<0.01）， and reduced the p-NF-κB/NF-κB level （P<0.05， P<0.01）. Cell experiments showed that compared with the blank group， the model group exhibited an increased apoptosis rate （P<0.01）. Compared with the model group， the serum containing Hei Xiaoyaosan at various doses improved the cell viability （P<0.01）， and the serum containing Hei Xiaoyaosan at the high dose decreased the cell apoptosis （P<0.01）. ConclusionHei Xiaoyaosan may improve the learning and memory abilities of AD model rats by regulating cell apoptosis， while increasing the vitality and reducing the apoptosis rate of AD model cells via the PI3K/Akt/NF-κB signaling pathway.

OBJECTIVE To study the spectru m-toxicity relationship of in vitro hepatotoxicity of aqueous extract from Euodia rutaecarpa. METHODS The aqueous extract from 16 batches of E. rutaecarpa from different habitats were prepared. The fingerprints of aqueous extract from E. rutaecarpa were established by ultra high performance liquid chromatography （UPLC） method and Similarity Evaluation System of TCM Fingerprint （2012A edition ），and common peaks were identified and the similarity was evaluated. Using normal human hepatocytes L 02 as subject ，inhibitory effect of aqueous extract from 16 batches of E. rutaecarpa to them were investigated. The spectrum-toxicity relationship of UPLC fingerprint of aqueous extract from E. rutaecarpa with the hepatotoxicity of hepatocytes L 02 was analyzed by grey relational analysis （GRA）and partial least squares regression analysis （PLSR）. The corresponding compound of the chromatographic peak with the greatest correlation with the in vitro hepatotoxicity of E. rutaecarpa were isolated ，prepared and identified. RESULTS There were 27 common peaks in UPLC fingerprints of aqueous extract from 16 batches of E. rutaecarpa ，with similarity of 0.375-0.995. Totally 9 peaks were confirmed ，i.e. neochlorogenic acid （peak 5），chlorogenic acid （peak 9），cryptochlorogenic acid （peak 10），caffeic acid （peak 12），rutin （peak 16），hyperin（peak 17），dehydroevotarine（peak 19），evotarine（peak 24），rutecarpine（peak 25）. The aqueous extract from 16 batches of E. rutaecarpa showed significant inhibitory effect on the growth of L 02 cells（P＜0.05 or P＜0.01），and the inhibitory rate ranged from 6.68％ to 67.95％. GRA showed that there were 18 common peaks with correlation degree greater than 0.8，which were peak 8＞peak 3＞peak 23＞peak 7＞peak 4＞peak 9＞peak 12＞peak 2＞peak 19＞peak 6＞ 4928381。E-mail：799247687@qq.com peak 15＞peak 5＞peak 1＞peak 17＞peak 21＞peak 26＞ peak 20＞peak 14 in descending order of correlation degree. PLSR showed that there were 14 peaks with regression coefficient＞0 and variable importance projection value ＞1，and the order of regression coefficient was peak 8＞peak 3＞peak 23＞ peak 2＞peak 7＞peak 4＞peak 12＞peak 9＞peak 19＞peak 5＞peak 17＞peak 26＞peak 10＞peak 15. Peak 8 had the greatest correlation with in vitro hepatotoxicity，and the corresponding compound of this peak was identified as 6-O-trans caffeoyl gluconic acid. CONCLUSIONS The in vitro hepatotoxicity of aqueous extract from E. rutaecarpa is the result of multiple component interaction，among which 6-O-trans caffeoyl gluconic acid shows closest relation with in vitro hepatotoxicity.

By reviewing the ancient materia medica， medical books and modern literature， this paper made a systematic textual research on Haliotidis Concha in famous classical formulas， including the name， origin， producing area， quality evaluation， harvesting and processing， in order to provide a basis for the development of famous classical formulas containing Haliotidis Concha. The textual research showed that Shijueming was the official name of Haliotidis Concha in past dynasties， and there were also aliases such as Qianliguang， Jiukongluo and Zhenzhumu named after its efficacy， properties and near-phonetic characters. Before the Tang dynasty， the original description of Haliotidis Concha was too concise， which could only be identified as the animal of genus Haliotis， family Haliotidae. During the Song， Yuan， Ming and Qing dynasties， the main varieties were H. diversicolor and H. discus hannai. At the beginning of the Republic of China， a variety of animals from genus Haliotis were used as Haliotidis Concha， and varieties were numerous and continued to this day. In ancient and modern times， the main producing areas in China are Hainan， Guangdong and Shandong， while the foreign producing areas are mainly Japan and Vietnam. The quality evaluation of Haliotidis Concha in ancient books was roughly determined by the number of openings of the expiratory orifice， and seven-hole and nine-hole abalone shells were preferred. In modern times， characters as big， neat， unbroken， clean inside and outside， lustrous， thick shells are preferred. Based on the textual research results and combined with the record years of the Shijueming San， it is suggested that the shells of H. diversicolor or H. discus hannai should be used in the development of this formula， and the raw products should be used as medicine.