There are many problems in the current laboratory diagnostics teaching including unreasonable structure of teaching contents and routinization of teaching methods,etc.This paper explored the laboratory diagnostics teaching reform from the textbooks,teaching subject and teaching focus,in order to better meet the needs of the development of medicine education and clinical practice.

OBJECTIVETo investigate the clinical treatment modality and prognosis of small cell lung cancer(SCLC).

METHODWe retrospectively analyzed the clinical data of 77 SCLC patients who were admitted to our department after 2002.

RESULTSThe disease was limited in 43 patients and extensive in 34 patients. For patients with limited SCLC, the 1-year, 2-year, and 5-year survival rate was 80%, 56%, and 21%, respectively. Four patients who had undergone surgical resection were all alive. Among patients who underwent adjuvant chemotherapy followed by radiotherapy, salvage chemotherapy, and salvage chemotherapy followed by radiotherapy, the median of survival period was 51 months, 12 months, and 28 months, respectively. For patients with extensive SCLC, the 1-year and 2-year survival rate was 56% and 25%, respectively. The median of survival period was 14.3 months. Stage was an independent factor in multifactor COX regression. Monofactor COX regression showed that radiotherapy and resection were factors correlated with survival. Brain metastasis had no impact on survival.

CONCLUSIONSChemotherapy followed by radiotherapy is preferred for limited SCLC, while surgical resection remains questionable for early-stage patients. For extensive SCLC, multi-line chemotherapy may be helpful to improve the overall survival. Stage is an independent factor for predicting the prognosis.

Adult ; Aged ; Aged, 80 and over ; Carcinoma, Small Cell ; diagnosis ; therapy ; Female ; Follow-Up Studies ; Humans ; Lung Neoplasms ; diagnosis ; therapy ; Male ; Middle Aged ; Prognosis ; Retrospective Studies ; Survival Analysis

To investigate the role and mechanism of Rac1 protein in the process of the human umbilical vein endothelial cell (HUVEC) senescence, we used hypoxia as a model for modulating HUVECs entering replicative senescence in vitro. Premature senescence of HUVECs was evidenced by detecting the SA-beta-Gal activity and PAI-1 expression. Meanwhile, cell cycle distribution and cell proliferation rate were investigated by flow cytometry assay and BrdU staining. The results indicated that the HUVECs became enlarged and flattened, both SA-beta-Gal activity and PAI-1 expression increased obviously, while cell proliferation was inhibited and G(1) phase cell cycle arresting occurred when HUVECs were treated with continued hypoxia for 96 h. Accompanied with these changes, the expression of activated Rac1 increased obviously in cells after hypoxia. All these observations suggested that endothelial senescence could be induced by continued hypoxia and it might correlate with the activity of Rac1. To further define the relationship between Rac1 and HUVEC senescence, HUVECs were transiently infected with the constitutively active form of Rac1 (V12Rac1) or dominant negative form of Rac1 (N17Rac1) using retrovirus vector pLNCX-V12Rac1 or pLNCX-N17Rac1. We observed the changes of these three kinds of HUVECs (HUVECs, N17Rac1-HUVECs, V12Rac1-HUVECs) after hypoxia for 48 h and 96 h, the expression and localization of serum response factor (SRF), which is one of the downstream signal molecules of Rac1, were also investigated. The results obtained indicated that after continued hypoxia for 48 h, HUVECs infected by V12Rac1 showed obvious senescence accompanied with SA-beta-Gal activation, PAI-1 expression increase, G(1) phase arrest and cell proliferation inhibition which were similar to HUVECs after continued 96-hour hypoxia treatment, while the senescence of HUVECs infected by N17Rac1 was significantly inhibited even if the cells were exposed to hypoxia for more than 96 h. All the results identified that the activation of Rac1 might accelerate HUVEC senescence induced by hypoxia and that inactivation of Rac1 could partly block the cell senescence. To further investigate the mechanism of HUVEC senescence induced by Rac1, we detected the expression of total SRF (tSRF) and nuclear SRF (nSRF) in these three kinds of HUVECs by immunofluorescent analysis and Western blot assay after hypoxia. The results showed that the expression of nSRF decreased obviously and the nuclear translocation of SRF was inhibited in HUVECs infected by V12Rac1 compared with those in the normal HUVECs. In contrast, the expression of nSRF increased obviously in the HUVECs infected by N17Rac1. These results suggest that activation of Rac1 accelerates endothelial cell senescence and inhibition of Rac1 activity prevents HUVECs from entering senescence induced by hypoxia, while the nuclear translocation of SRF regulated by Rac1 might play an important role in the process of senescence.
Cell Hypoxia ; Cells, Cultured ; Cellular Senescence ; physiology ; Human Umbilical Vein Endothelial Cells ; cytology ; Humans ; Plasminogen Activator Inhibitor 1 ; genetics ; metabolism ; Serum Response Factor ; genetics ; metabolism ; beta-Galactosidase ; metabolism ; rac1 GTP-Binding Protein ; metabolism

RhoA is one of the main members of RhoGTPase family involved in cell morphology, smooth muscle contraction, cytoskeletal microfilaments and stress fiber formation. It has been demonstrated that RhoA modulates endothelial cell permeability by its effect on F-actin rearrangement, but the molecular mechanism of rearrangement of actin cytoskeleton remains unclear. Recent studies prove that RhoA/Rho kinase regulates smooth muscle specific actin dynamics by activating serum response factor (SRF)-dependent transcription. To further investigate the molecular mechanism of the rearrangement of vascular endothelial cell actin cytoskeleton, we explored the relationship between the activation of SRF and F-actin rearrangement induced by RhoA in human umbilical vein endothelial cells (HUVECs). HUVECs were infected with the constitutively active forms of RhoA (Q63LRhoA) or the dominant negative forms of RhoA(T19NRhoA) using retrovirus vector pLNCX-Q63LRhoA or pLNCX-T19NRhoA, the positive clone was obtained by G418 selection. The expression and distribution of SRF in normal and infected cells were evaluated by immunohistochemistry and Western blot in complete medium and in serum-free medium. The effect of F-actin polymerization was detected by Rhodamine-Phalloidine staining. Infection of PLNCX-Q63LRhoA induced F-actin rearrangement and stress fiber formation in HUVECs, as well as enhanced the expression of SRF in the nuclei. In contrast, the cells infected with T19NRhoA showed no distinct changes. With serum deprivation, the expression of SRF increased obviously in both normal and infected HUVECs, but the subcellular localization of SRF was evidently different. In HUVECs, the localization of SRF was in the nuclei after 3 d with serum deprivation, but it was redistributed outside the nuclei after 5 d with serum deprivation. In cells infected with Q63LRhoA, the immunolocalization of SRF was always in the nuclei compared with HUVECs infected with T19NRhoA, which was almost always localized in the cytoplasm. In HUVECs, the rearrangement of F-actin and formation of stress fiber increased after 3 d with serum deprivation, but appeared decreased and unpolymerized after 5 d with serum deprivation. The polymerization of F-actin and the formation of stress fiber in HUVECs infected with Q63LRhoA kept during the period of serum-free culture, whereas the rearrangement of F-actin in cells infected with T19NRhoA was not found. These results suggest that RhoA influences endothelial F-actin rearrangement in part by regulating the expression and subcellular localization of SRF.
Actins ; biosynthesis ; genetics ; Cytoskeleton ; metabolism ; Endothelium, Vascular ; cytology ; metabolism ; Humans ; Intracellular Signaling Peptides and Proteins ; Protein-Serine-Threonine Kinases ; metabolism ; Serum Response Factor ; biosynthesis ; genetics ; Umbilical Veins ; cytology ; rho-Associated Kinases ; rhoA GTP-Binding Protein ; physiology

Isotemporal substitution model is a powerful tool to explore the real association between physical behavior and health outcomes, which has the potential of the application in large-scale cohort study. This paper systematically introduces the principle of isotemporal substitution model and its implementation method in specific analysis to provide analytical ideas for the epidemiological research related to physical behavior in China. The baseline data of Regional Ethic Cohort Study in Northwest China conducted in Shaanxi province were used to analyze the relationship between physical behavior and cardiovascular disease with single-factor model, partition model and isotemporal substitution model. The advantages and disadvantages of different models were compared, and the advantages of isotemporal substitution model in quantifying physical activity health risk were introduced. Isotemporal substitution model could qualify physical behavior and health outcomes, which has wide application value in epidemiological research.
Humans ; Cohort Studies ; Epidemiologic Studies ; Cardiovascular Diseases ; China/epidemiology*

AIM:To investigate the role of SDF-1α/CXCR4 axis in pancreatic cancer cell migration and invasion.METHODS:The mRNA expression of CXCR4 in 4 pancreatic cancer cell lines was detected by RT-qPCR.The migration and invasion abilities of PANC-1 cells with the axis activated by exogenous SDF-1αor inhibited by CXCR4 inhibitor AMD3100 were detected by Transwell assays.The cell viability was measured by MTS assay.The protein expression of the epithelial-mesenchymal transition (EMT) -related molecules in the cells treated with exogenous SDF-1αor AMD3100 was determined by Western blot.RESULTS:All of the 4 pancreatic cancer cell lines expressed CXCR4 mRNA, while the PANC-1 cell line expressed the most.Exogenous SDF-1αpromoted the migration and invasion abilities of PANC-1 cells, which was inhibited by AMD3100.The PANC-1 cells treated with exogenous SDF-1αfor 72 h grew faster, while SDF-1αcombined with AMD3100 made little significance to the viability of PANC-1 cells.Exogenous SDF-1αinduced EMT of PANC-1 cells by up-regulating the expression of SNAIL and TWIST, and AMD3100 reversed this effect.CONCLUSION:SDF-1α/CXCR4 axis enhances the migration and invasion abilities of pancreatic cancer cells through inducing EMT.

Senile osteoporosis (SOP) is a systemic bone disease characterized by increased susceptibility to fractures. The pathogenesis of SOP is complex and not well understood. Currently, the rapid aging model mouse, senescence accelerated mouse prone 6 (SAMP6), is an ideal model for studying the mechanisms of SOP development and exploring its prevention and treatment. This model exhibits characteristics including increased bone fragility, degradation of bone microstructure, loss of bone matrix, and abnormal metabolism and dysfunction of bone cells, faithfully replicating the process of SOP occurrence and progression at both macroscopic and microscopic levels.

AIM: To investigate the efficacy and safety of 577nm subthreshold micropulse laser(SML)in patients with chronic central serous chorioretinopathy(CSC).METHODS: Prospective single-arm case study. There were 24 patients(32 eyes)with chronic CSC treated by using 577nm SML. A total of 6mo was followed up after treatment, the best corrected visual acuity(BCVA, LogMAR)and optic coherence tomography(OCT)were performed at each month. Fluorescein fundus angiography(FFA)was performed at 1,3 and 6mo after treatment.RESULTS: The BCVA was 0.46±0.34 and central retinal thickness(CRT)was 259.15±57.54μm of 32 eyes at baseline period. After treatment of SML at 1mo, there was no subretinal fluid in 21 eyes(66%), and subretinal fluid was observed in 11 eyes(34%). The BCVA was 0.43±0.27, the CRT was 232.13±42.58μm. CRT was significantly reduced compared to the baseline period(P<0.05). After treatment of SML at 3mo, subretinal fluid and fluorescein leakage from retinal pigment epithelium(RPE)were observed in 5 eyes(16%). The BCVA was 0.39±0.26 and CRT was 231.26±49.25μm. The CRT was still significantly lower than baseline period(P<0.05). The 5 eyes with subretinal fluid and leaked fluorescein were treated by using SML again. After treatment at 6mo, subretinal fluid was observed in only 3 eyes(9%). The BCVA was 0.19±0.47 and CRT was 217.25±35.54μm. Both of the BCVA and CRT showed a significant improvement from the baseline period(P<0.05). CONCLUSION:SML seems effective and safe for treatment of chronic CSC. It may be an alternative way for treatment of chronic CSC.

OBJECTIVETo determine independent factors correlated with clinical effects of DK crush and classical crush technique with drug-eluting stents on bifurcation lesions.

METHODS311 patients with bifurcation lesions were randomized to classical (C, n = 156) or double kissing (DK) crush (n = 155) stent implantation group. The primary endpoints included major adverse cardiac events (MACE).

RESULTSFinal kissing balloon inflation (FKBI) success rate was 76% in C and 100% in DK groups (P < 0.001). DK crush procedure was characterized by lower unsatisfactory FKBI rate (27.6% vs.6.3%, P < 0.01). Clinical follow-up was available in 100% and angiographic follow-up in 82% patients. The overall restenosis rate was 32.3% in C and 20.3% in DK groups (P = 0.01), respectively. Cumulative 8-month MACE was 35.9% in without-FKBI and 19.7% in with-FKBI sub-groups, and 11.4% in DK group (P = 0.02). The incidence of stent thrombosis was 3.2% in C group (5.1% without vs. 1.7% with FKBI) and 1.3% in DK group (P > 0.05). The predictive factors of MACE included minimal side branch stent lumen diameter and lack of DK crush technique.

CONCLUSIONDK crush technique is an alternative of double stenting techniques in terms of improvement of restenosis and clinical outcomes.

Aged ; Angioplasty, Balloon, Coronary ; methods ; Coronary Artery Disease ; therapy ; Coronary Stenosis ; therapy ; Drug-Eluting Stents ; Female ; Humans ; Male ; Middle Aged ; Prospective Studies ; Stents

Objective: To explore the occupational protective effect of different protective devices on the operators during manual cleaning and oiling of dental handpieces, and to provide a basis for the selection of appropriate protective methods. Methods: From November 2020 to December 2021, 20 high-speed dental handpieces of the same brand were selected and randomly divided into disposable protective bag group and small aerosol safety cabinet group by drawing lots, with 10 in each group. After recording the model, they were distributed to the clinical fixed consulting room for use, and were collected by specially-assigned personnel every day for manual cleaning under the protection of the two devices. By measuring the number of airborne colonies, the concentrations of particulate matter and the satisfaction of operators, the occupational protection effect of the two protective devices on operators was evaluated. Results: Under the protection of the two devices, the average number of airborne colonies after operation was less than 1 CFU/ml. When no protective device was used, the number concentration of particulate matter produced during operation was (21595.70±8164.26) pieces/cm(3). The number concentrations of particles produced by disposable protective bag group [ (6800.24±515.05) pieces/cm(3)] and small aerosol safety cabinet group [ (5797.15±790.50) pieces/cm(3)] were significantly lower than those without any protective device (P<0.001). The number concentration of particle matter of small aerosol safety cabinet group was significantly lower than that of disposable protective bag group (P<0.001). In the satisfaction evaluation of operators, small aerosol safety cabinet group [ (3.53±0.82) points] was significantly better than disposable protective bag group [ (2.23±1.10) points] (P<0.001) . Conclusion: The use of small aerosol safety cabinet during manual cleaning and oiling of dental handpieces has good protective effect, superior safety performance and strong clinical applicability, and has advantages in occupational protection of clinical operators.
Aerosols ; Particulate Matter ; Protective Devices