BACKGROUND:Oversize stress of a dental implant and its surrounding tissue is the main factor to affect the
long-term use of dental implants. So, the reasonable and precise design of implant shape is one of the important methods of prolonging the life span of dental implants.
OBJECTIVE:To make the optimal analysis and design of the diameters of connector screw and central screw of the adjustable-angle dental implant invented in the earlier stage.
METHODS: The finite element analysis model of the edentulous mandible with adjustable-angle dental implant was established by software Pro/E 5.0, Mimics 10.0 and ANSYS Workbench 14.5. The maximum equivalent
stress of dental implant-edentulous mandibular model was analyzed.
RESULTS AND CONCLUSION:The maximum equivalent stress of dental implant-edentulous mandibular model

OBJECTIVETo study the relaxant effects of glycyrrhizinate and salvianolic acid B on rat portal vein in vitro.

METHODSHealthy female Wistar rats were canalized from hepatic artery, portal vein and hepatic vein in vitro. Remained blood in liver was eliminated with heparinized Krebs-Henseleit solution through hepatic artery, then the liver was isolated under infusing manner. Being constricted with phenylephrine and relaxed with acetylcholine, and infused with glycyrrhizinate or salvianolic acid B, the portal pressures of infused rat livers were consistently monitored by BL-420S physiological experiment system. The median effective concentration (EC50) of the two agents were analyzed with non-linear various slope regression using Prism-4 software.

RESULTSEC50 of glycyrrhizinate in relaxing the phenylephrine-contracted portal was 1.5556 x 10(-9) mol/L, suggesting one of the mechanism of action of diammonium glycyrhizinate for the treatment of portal hypertension was direct relaxation. Salvianolic acid B showed constrictive action on the phenylephrine-retracted portal vein, the EC50 was 1.4639 x 10(-9) mol/L, indicating that its indirect control action was took part in the portal hypertension therapy synergistically.

CONCLUSIONUnder the mode with both controlled-velocity and monitored pressure, glycyrrhizinate showed relaxation and salvianolic acid B showed constriction on portal pressure in vitro.

Animals ; Benzofurans ; pharmacology ; Blood Pressure ; drug effects ; Female ; Glycyrrhizic Acid ; pharmacology ; Hypertension, Portal ; physiopathology ; Phenylephrine ; pharmacology ; Portal Vein ; physiology ; Rats ; Rats, Wistar ; Vasoconstrictor Agents ; pharmacology ; Vasodilator Agents ; pharmacology ; Vasomotor System ; drug effects

Purpose To detect the expression of PP1A and GSDME and the abundance of CD8+T lymphocytes in colorectal cancer,and to explore the correlation and clinical significance of PP1A and GSDME mediated pyroptosis.Methods GEPIA da-tabase was applied to analyze the mRNA expression of PP1A and GSDME in colorectal cancer and normal tissues.Western blot assay was used to detect the expression of PP1A in colorectal cancer and the corresponding normal mucosa.Immunohisto-chemistry was applied to detect the expression of PP1A and GS-DME and CD8+T lymphocytes abundance in 107 colorectal car-cinomas and normal mucosa adjacent to the carcinomas.Spearman rank correlation was used to analyze the correlation between PP1A,GSDME and CD8+T cells abundance.Results The GEPIA database search showed that mRNA expression of PP1A and GSDME in colorectal cancer differed compared to normal tissues(P＜0.05).Western blot analysis showed that the relative expression of PP1A in colorectal cancer tissue was significantly higher than that in para-cancerous tissues(0.937 vs 0.643,P＜0.001).Immunohistochemical results showed that the expression of PP1A in colorectal cancer tissues was signifi-cantly higher than that in normal mucosa(P＜0.05).The ex-pression of GSDME in cancer tissue was closely correlated with patients'age,clinical stage and mismatch repair proteins(P＜0.05),and the distribution of CD8+T cells in the cancer infil-tration front was significantly higher than that in the normal mu-cosa,and the distribution of CD8+T cells in the cancer was cor-related with pT stage,clinical stage and lymph node metastasis.Spearman correlation analysis showed that PP1A was negatively correlated with GSDME expression(r=-0.196,P＜0.05).The overall survival PP1A-positive colorectal cancer patients was worse than that of PP1A-negative patients(P＜0.05),and the prognosis of patients was correlated with the degree of differentia-tion,lymph node metastasis,pT stage and clinical stage.Posi-tive expression of PP1A,degree of differentiation,clinical stage,pT stage and lymph node metastasis are independent risk factors affecting the prognosis of colorectal cancer patients.Conclusion PP1A is highly expressed in colorectal cancer and negatively correlated with GSDME-mediated cell pyroptosis,and the differ-ential expression of both is closely related to the progression and prognosis of colorectal cancer,which can be used as a potential indicator for judgment of the prognosis of colorectal cancer pa-tients.The differential distribution of CD8+T cells may be asso-ciated with GSDME-mediated cell pyroptosis and tumor develop-ment.

Objective To screen a variety of Porphyromonas gingivalis (Pg) common outer membrane proteins with two-dimensional liquid phase fractionation (PF2D) and matrix-assisted laser desorption ionization time-of-flight/time-of-flight mass spectrometry ( MALDI-TOF/TOF-MS ) and provide candidate target antigen for the design of vaccines with cross protection against a variety of Pg. Methods The outer membrane proteins of Pg301, PgATCC33277 and PgW83 were extracted through ultracentrifugation, and then they were separated by ProteomeLab PF2D protein fractionation system. After separation, the outer membrane proteins were obtained through comparison, and the primary structure of the proteins was identified by MALDI-TOF/TOF-MS and database. Results Ninety-nine protein samples out of 3 strains of Pg were obtained after the high performance chromato focusing (HPCF) separation process. B7 fractions of 3 strains of Pg were separated by the reversed-phase high performance liquid chromatography (RP-HPCL) separation process. After comparison of peak and retention time of chromatogram, the 8 common protein peaks of 3 strains of Pg were confirmed. The protein samples were identified by MALDI-TOF/TOF-MS, and one of them was known protein arg-gingipainA. Conclusions PF2D protein fractionation system is of good reproducibility and high resolution. A combination of PF2D and MALDI-TOF/TOF-MS can be used to identify the common outer memberane proteins of Pg.

Background: Epidermal growth factor receptor (EGFR) mutations, including a known exon 19 deletion (19 del) and exon 21 L858R point mutation (L858R mutation), are strong predictors of the response to EGFR tyrosine kinase inhibi?tor (EGFR?TKI) treatment in lung adenocarcinoma. However, whether patients carrying EGFR 19 del and L858R muta?tions exhibit different responsiveness to EGFR?TKIs and what are the potential mechanism for this difference remain controversial. This study aimed to investigate the clinical outcomes of EGFR?TKI treatment in patients with EGFR 19 del and L858R mutations and explore the genetic heterogeneity of tumors with the two mutation subtypes. Methods: Of 1127 patients with advanced lung adenocarcinoma harboring EGFR 19 del or L858R mutations, 532 received EGFR?TKI treatment and were included in this study. EGFR 19 del and L858R mutations were detected by using denaturing high?performance liquid chromatography (DHPLC). T790M mutation, which is a common resistant mutation on exon 20 of EGFR, was detected by amplification refractory mutation system (ARMS). Next?generation sequencing (NGS) was used to explore the genetic heterogeneity of tumors with EGFR 19 del and L858R mutations. Results: Of the 532 patients, 319 (60.0%) had EGFR 19 del, and 213 (40.0%) had L858R mutations. The patients with EGFR 19 del presented a significantly higher overall response rate (ORR) for EGFR?TKI treatment (55.2% vs. 43.7%, P = 0.017) and had a longer progression?free survival (PFS) after first?line EGFR?TKI treatment (14.4 vs. 11.4 months,P= 0.034) compared with those with L858R mutations. However, no statistically significant difference in overall survival (OS) was observed between the two groups of patients. T790M mutation status was analyzed in 88 patients before EGFR?TKI treatment and 134 after EGFR?TKI treatment, and there was no significant difference in the co?exist?ence of T790M mutation with EGFR 19 del and L858R mutations before EGFR?TKI treatment (5.6% vs. 8.8%, P = 0.554)or after treatment (24.4% vs. 35.4%, P= 0.176). In addition, 24 patients with EGFR 19 del and 19 with L858R mutations were analyzed by NGS, and no significant difference in the presence of multiple somatic mutations was observed between the two genotypes. Conclusions: Patients with EGFR 19 del exhibit longer PFS and higher ORR compared with those with L858R muta?tions. Whether the heterogeneity of tumors with EGFR 19 del and L858R mutations contribute to a therapeutic response difference needs further investigation.

OBJECTIVETo investigate the therapeutic effect of mild hypothermia on severe traumatic brain injury.

METHODSEighty-six in-patients with severe traumatic brain injury treated ordinarily were consecutively randomized into two groups: a hypothermia group (n=43) and a normothermia group (the control group, n=43). In the hypothermia group, the core temperature (i.e., nasopharyngeal or brain temperature) of the patient was reduced to and maintained at 33-35 degrees C with a systemic cooling blanket. Natural rewarming began after 3-5 days (mean: 4.3 days) of hypothermia treatment. In the control group, the patient received no hypothermia treatment. The vital sign, extradural pressure and serum superoxide dismutase were observed and measured during treatment, and the complications as well as the Glasgow outcome scale were evaluated at 2 years after injury.

RESULTSThe mean extradural pressure in the hypothermia group (27.38 mm Hg +/- 4.88 mm Hg at 24 hours, 29.40 mm Hg +/- 4.50 mm Hg at 48 hours and 26.40 mm Hg +/- 4.13 mm Hg at 72 hours after injury) was much lower than that in the control group (32.63 mm Hg +/- 3.00 mm Hg, 34.80 mm Hg +/- 6.00 mm Hg and 31.81 mm Hg +/- 4.50 mm Hg respectively at 24, 48 and 72 hours, P<0.05). The mean serum superoxide dismutase levels in the hypothermia group on days 3 and 7 (583.7 microg/L +/- 99.6 microg/L and 699.4 microg/L +/- 217.3 microg/L, respectively) were much higher than those in the control group at the same time period (446.6 microg/L +/- 79.5 microg/L and 497.1 microg/L +/- 101.2 microg/L, respectively, P<0.01). The recovery rates at 2 years after injury were 65.1% in the hypothermia group and 37.2% in the control group (P<0.05). The mortality rates were 25.6% in the hypothermia group and 51.2% in the control group (P<0.05). The complications, including pulmonary infections, thrombocytopenia (platelet count < 100 x 10(9)/L), hemorrhage in the digestive tract, electrolyte disorders and renal malfunction, were managed without severe sequelae.

CONCLUSIONSMild hypothermia is a safe and effective therapeutic method, which can lower the extradural pressure, increase the serum superoxide dismutase and improve the neurological outcomes without severe complications in the patients with severe traumatic brain injury.

Adult ; Aged ; Analysis of Variance ; Chi-Square Distribution ; Craniocerebral Trauma ; therapy ; Decompression, Surgical ; Female ; Glasgow Coma Scale ; Humans ; Hypothermia, Induced ; Intracranial Pressure ; Male ; Middle Aged ; Therapeutics

OBJECTIVE: To establish the cell model of human neuroblastoma cell( SH-SY5Y cell) exposed to1,2-dichloroethane( 1,2-DCE) in vitro and to explore the mechanism of 1,2-DCE-induced toxicity in SH-SY5Y cells.METHODS: SH-SY5Y cells were collected in their logarithmic growth phase and cultured in complete medium that had final concentrations of 1,2-DCE in 0,10,20,30,40,50,60,70 and 80 mmol / L for 24 hours. Cell morphology was observed and cell survival rate was examined by CCK-8 assay. Using chemical colorimetric method, the activity of lactic dehydrogenase( LDH) in the cell culture supernatant,and the intracellular level of malondialdehyde( MDA),the intracellular activities of superoxide dismutase( SOD) and adenosine triphosphate( ATP) enzymes were detected. RESULTS: With the increasing exposure concentrations of 1,2-DCE,the cell density of SH-SY5Y cells gradually decreased,the synapse became shorter,the membrane ruptured,cytoplasm condensed and cytoplasmic contents overflowed increased.With the increasing concentration of 1,2-DCE,the cell survival rate decreased( P < 0. 01),the activity of LDH in the cell culture supernatant increased( P < 0. 01). These changes had a dose-effect correlation. Intracellular MDA level,and activities of SOD,Na~+-K~+-ATP enzyme,Ca~(2+)-Mg~(2+)-ATP enzyme and total ATP enzyme increased at first and then decreased. The activity of LDH in the cell culture supernatant and cell survival rate was negatively correlated( the correlation coefficient is- 0. 907,P < 0. 01). CONCLUSION: 1,2-DCE could inhibit the proliferation of SH-SY5Y cells.The mechanism may be related to the permeability change of cell membrane,cellular damage from excessive free radicals,the decrease of free radical scavenging capacity,ATP enzyme activity and calcium overloading. SH-SY5Y cells can be used as a common cell line for 1,2-DCE cytotoxicity analysis.

Objective To investigate the long-term incidence of in-stent stenosis(ISS)in patients with intracranial aneurysms receiving pipeline embolization device(PED)who showed no ISS at short-to-medium term follow-up examination.Methods The clinical data of patients,who received PED treatment at the Department of Neurointervention,First Affiliated Hospital of Zhengzhou University of China between April 2015 and June 2022,were retrospectively collected.The patients with intracranial aneurysms,who showed no ISS at the initial follow-up with DS A and completed＞12 months long-term follow-up check after treatment at the same hospital,were screened out,and their relevant clinical data and imaging materials were collected.The incidence of ISS occurring in postoperative＞12 months long-term follow-up was calculated.The ISS was defined as a＞25％lumen loss of the parent artery when compared with its lumen size measured immediately after PED implantation.Results A total of 57 patients with 61 aneurysms were enrolled in this study,and a total of 68 PEDs were implanted.Forty-one(67.21％)aneurysms were treated by PED implantation only,and 20(32.79％)aneurysms by PED plus spring coils.The median initial follow-up time was 184.0 days(119.0,212.5).At postoperative＞12 months long-term follow-up visit,DSA was employed for 35(57.38％)aneurysms,CTA was adopted for 22(36.07％)aneurysms,and 3D-SPACE sequence MR scan was performed in 4(6.56％)aneurysms.The median follow-up time was 538.0 days(407.5,678.0),and the incidence of ISS was 0％.No ISS-related neurological symptoms occurred in all patients.Conclusion In treating intracranial aneurysms with PED,the postoperative incidence of ISS is low.No ISS is found during the short-term follow-up period,and long-term follow-up results tend to indicate that no ISS events have occurred.

Band 3 protein is an important channel protein in the erythrocyte membrane which mediates the anion transport process inside and outside the cell membrane,as well as contributes to the maintenance of erythrocyte morphology,and has important physiological functions.However,the distribution state of this protein in the primary cell membrane is not known.Cryo-scanning electron microscopy enables imaging of the surface morphology of biological samples in a near-physiological state.In order to investigate the distribution of band 3 protein on erythrocyte membranes under physiological conditions,the present study utilized 5-nm gold nanoparticles modified with the antibodies to specifically bind to the band 3 protein on human blood erythrocyte membranes and imaged them by cryo-scanning electron microscopy,to obtain distribution of band 3 protein on human blood erythrocyte membranes.The results showed that the membrane proteins on the erythrocyte membranes tended to be clustered and distributed to form ″protein islands″,and band 3 proteins were mainly distributed in these protein islands,which were tightly connected with each other to form several functional microregions to play their respective roles.

Bullous pemphigoid (BP) is a common autoimmune subepidermal bullous disease.The diagnosis of BP relies on clinical manifestation,histopathology,direct and indirect immunofluorescence,and serological assay.In the past two decades,topical corticosteroids and systemic and/or topical corticosteroids were the major therapeutic options for localized/mild/moderate and extensive/severe BP,respectively.In 2021,several experts from the French Study Group on Autoimmune Bullous Skin Diseases collaboratively issued the updated guidelines for the therapeutic management of BP based on evidence-based medicine.The guidelines fully detailed the updated therapeutic options for extensive BP,BP of limited extent,localized form of BP,corticosteroid-dependent BP,and drug-induced/associated BP.In particular,systemic corticosteroids are no longer the first-line treatment for extensive BP.We interpret the guidelines to assist dermatologists in the comprehensive management of BP and promote the standardization of BP treatment.
Humans ; Pemphigoid, Bullous/drug therapy* ; Autoimmune Diseases/drug therapy* ; Glucocorticoids/therapeutic use* ; Adrenal Cortex Hormones/therapeutic use*