[Adstract] Micro-lecture, as the main teaching form of MOOC and SPOC network teaching platform, is deeply welcomed by the majority of students. Pathology is the bridge connecting basic medicine and clin-ical medicine in medical education, which has such characteristics as many knowledge points, dispersion and obscurity, etc. Therefore, the production of micro courses is based on the knowledge points, and according to the characteristics of the knowledge points, it should also be applied reasonably according to the charac-teristics of each chapter. Adopting the teaching of self-study after class and teachers and students' discussion in class for micro courses can not only greatly improve the quality of teaching, but also develop the students' ability of independent thinking and the ability to analyze and solve problems, which transforms the teaching of pathology from pure knowledge to ability.

Objective To investigate the mechanism of restenosis after carotid stent and balloon angioplasty for the Guangxi swines by intravascular ultrasound(IVUS). Methods Twelve Guangxi swines fed by a high cholesterol diet were randomly divided into two groups. Seven stents were implanted in the left carotid artery of six swines in the first group, and balloon angioplasty was performed in the left carotid artery of swines in the other group. Digital subtraction angiography(DSA) and IVUS were conducted respectively before and after the intervention and in the 13th week. Results IVUS found that the percentage of area stenosis in stent group was (18.31±7.79) % and in balloon group (37.28±7.89) % in the 13th week. The percentage of area restenosis in stent was obviously related to neointimal hyperplasia (r = 0.897, P<0.05), the percentage of area restenosis due to balloon angioplasty was markedly related to area decrease of external elastic lamina (r = 0.856, P<0.05). Conclusions The restenosis in stent was related to intimal hyperplasia of blood vessel,and restenosis after balloon angioplasty had some connection with area decrease of external elastic lamina.

Human platelet lysates(HPL), as a new type of biomaterial, can promote tissue repair, cell proliferation and inflammation control. This paper introduced the development of HPL in the field of regenerative medicine and cell therapy and summarizes their application. The potential of HPL to promote cell proliferation was used as an entry point to show its advantages as a supplement of cell culture medium. Since there is currently no standard procedure for HPL preparation, this paper sorts out the standardization elements such as raw materials source, donor variability and preparation technology, in order to provide reference for the establishment of standards of relevant industry in the future.

Objective:To explore the medical costs and influencing factors of patients diagnosed with Brucellosis in Datong of Shanxi province.Methods:Information on demographics, medical visits, and costs of patients diagnosed with Brucellosis between January 1, 2017, and December 31, 2019, were collected. Health care utilization and medical costs were analyzed from different genders, age groups, underlying diseases, clinical stages, and comorbidities.Results:A total of 2 289 patients (1 715 outpatient and 574 inpatient cases) were included in the analysis. 72.0% (1 649/2 289) were male, with an average age of (49.6±15.5) years; age between 45-59 years was the dominant group (36.2%,829/2 289). The mean age of inpatients (51.4±16.0) was higher than that of outpatients (49.0±15.2)( Z=-4.01, P<0.001). The average number of outpatient visits per outpatient was (1.6±1.5) times. The duration of hospitalization was (14.6±9.9) and (20.8±11.4) days for patients with central nervous system complications and (16.6±9.5) days for vascular system complications. Of the inpatients, 51.0% (293/574) had underlying diseases, and 30.3% (174/574) had endocrine and metabolic diseases. 54.0% (310/574) of inpatients were diagnosed with acute Brucellosis, and 46.0% (264/574) were diagnosed with chronic Brucellosis. A total of 64.3% (369/574) of inpatients had complications, 30.3% (174/574) of digestive system complications, followed by skeletal system complications (29.1%, 167/574). Among outpatients, age significantly affected medical costs ( P<0.001). For inpatients, age and complications and treatment effect were influential factors ( P<0.05). Patients with the combined skeletal system and central nervous system complications had significantly higher medical costs ( P<0.001). Conclusions:The medical costs for outpatient cases of Brucellosis were moderate. However, the economic burden was higher for inpatients, especially those with skeletal and neurological complications. Early detection, diagnosis, and treatment of cases were essential to avoid chronic Brucellosis and its complications and reduce medical costs.

Acidosis, regardless of hypoxia involvement, is recognized as a chronic and harsh tumor microenvironment (TME) that educates malignant cells to thrive and metastasize. Although overwhelming evidence supports an acidic environment as a driver or ubiquitous hallmark of cancer progression, the unrevealed core mechanisms underlying the direct effect of acidification on tumorigenesis have hindered the discovery of novel therapeutic targets and clinical therapy. Here, chemical-induced and transgenic mouse models for colon, liver and lung cancer were established, respectively. miR-7 and TGF-β2 expressions were examined in clinical tissues (n = 184). RNA-seq, miRNA-seq, proteomics, biosynthesis analyses and functional studies were performed to validate the mechanisms involved in the acidic TME-induced lung cancer metastasis. Our data show that lung cancer is sensitive to the increased acidification of TME, and acidic TME-induced lung cancer metastasis via inhibition of miR-7-5p. TGF-β2 is a direct target of miR-7-5p. The reduced expression of miR-7-5p subsequently increases the expression of TGF-β2 which enhances the metastatic potential of the lung cancer. Indeed, overexpression of miR-7-5p reduces the acidic pH-enhanced lung cancer metastasis. Furthermore, the human lung tumor samples also show a reduced miR-7-5p expression but an elevated level of activated TGF-β2; the expressions of both miR-7-5p and TGF-β2 are correlated with patients' survival. We are the first to identify the role of the miR-7/TGF-β2 axis in acidic pH-enhanced lung cancer metastasis. Our study not only delineates how acidification directly affects tumorigenesis, but also suggests miR-7 is a novel reliable biomarker for acidic TME and a novel therapeutic target for non-small cell lung cancer (NSCLC) treatment. Our study opens an avenue to explore the pH-sensitive subcellular components as novel therapeutic targets for cancer treatment.