Objective To investigate the effects of intravitreal injection of matrix metalloproteinase-3 (MMP-3) on the vitreoretinal adhesion and the vitreous gelatin. Methods Twenty-four pigmented rabbits were randomly divided into 3 experimental groups (group A, B, and C)and one control group with 6 rabbits (12 eyes) in each. Different concentrations of 0.1 ml MMP-3 (5,10, 20 ng in group A, B, and C, respectively) and equivalent dose of balanced salt solution were intravitreally injected to the rabbits, respectively. Clinical examinations (such as gross observation, slit-lamp biomicroscopy, indirect fundus ophthalmoscopy ), electroretinography (ERG) and fundus fluorecein angiography (FFA) were taken before and after injection. Results One week after injection, posterior vitreous detachment (PVD) and focal vitreous liquefaction were recognized clinically for the first time in 1 eye in group B. By the end of this study, clinically detected PVD developed in 1 eye in group A, 3 eyes in group B, but the synchisis developed slowly, and no liquefaction or PVD occurred in control group. As for the histological examination, partial PVD was observed in 1 eye in group A and 3 eyes in group B 60 minutes after injection. All of the eyes in group A and B showed partial PVD 1 week after injection, and the area of PVD enlarged in contrast with before. Complete PVD were recognized in 1 eye in group A and 3 eyes in group B 15 weeks after injection, and the cleavage was narrow and limited. In group C, inflammatory cell infiltration in the inner layer of retina, destruction of retinal structure, and fluorescein leakage at late phase was found in the early period after injection. Conclusions MMP-3 is effective in disrupting the adhesion of the posterior hyaloid to the inner limiting membrane leading to PVD, and helpful to some extent in producing vitreous liquefaction. The dose of 10 ng MMP-3 is safe and effective for the rabbits eyes, which may be used as an promising assistant of vitreous surgery.

Objective To discuss the role of DNA-dependent protein kinase catalytic subunit (DNA-DPKCS) in human lung adenocarcinoma cell line (A549) by using small interfering RNA (siRNA) to specifically knockdown DNA-DPKCS expression and its effects on cell proliferation, cell cycle and radio-sensitivity. Methods The DNA-DPKCS-siRNA expression vector was constructed and transfected into A549 cell line. The transformed clones were randomly selected and isolated. The cell cycle distribution and apop-tesis were analyzed by flowcytometry analysis. Cell survival was detected by using clonogenic formation as-say. Results With specific inhibition of DNA-DPKCS expression, stable transfected cell line 549pRNA-DNA-DPKCS was constructed by RNA interference technique. The 549pRNA-C and 549pSUPER cell lines were the control cell lines tansfected with control and blank plasmids, respectively. Compared with A549 cells, the expression levels of DNA-DPKCS mRNA (0.110: 1. 000), protein (0. 870: 2.967) and activity of DNA-DPKCS (0.004: 0.266) in 549pRNA-DNA-DPKCS cells were significantly lower (F = 80.55 ,P < 0.01;F=63.96, P<0.01;F=51.62,P<0.01, respectively). The analysis of SF_2(0.25:0.76), D_0 (1.42:1.62) and D_q (0.06: 1. 00) showed significant difference between 549pRNA-DNA-DPKCS and A549 cells (F = 996.86, P < 0.01 ; F = 17.41, P < 0.05 ; F = 68.92, P < 0.01). The number of 549pRNA-DNA-DPKCS cells in S (24.5%: 35.5%) and G_2 (10.7%: 11.0%) phases was significantly decreased (F = 4.83, P<0.05 and F=32.04, P <0.01, respectively). Conclusions In A549 cells, inhibit of DNA-DPKCS gene expression can enhance the radiosensitivity and affect cell cycle distribution.

Objective To investigate the relationship between the tumor differentiation and the related pathologic factors in Esophago-gastric junction adenocarcinoma. Methods The pathological data from 163 patients of Esophago-gastric junction adenocarcinoma underwent radical surgical resections were randomly divided two groups (group1: well-differentiated,group2: poor-differentiated). The composition of N stages,T stages,morphological type and vessel carcinoma embolus were compared between the two groups ,respectively. The tumor sizes and the number of metastases lymph nodes were compared between the two groups. Results The cases with lower N stages or T stages in group1 were dominant(T1 and T2:55. 74%,N1 and N2:75.41%). Oppositely,those with higher N stages or T stages were dominant(T3 and T4:59.81%,N1 and N2:57.85%)in group 2. The differences were significant Incidence of vessel carcinoma embolus was 44. 26%(27/61)in group 1 and 63. 73%(65/102)in group 2,with a significant difference. There was no significant difference for morphological type in the two groups. The tumor sizes and the number of metastases lymph was 4. 27 ±2. 00 cm and 4. 15 ±5.27 respectively in group 1 ,and 5. 87 ± 3. 26 cm and 8. 80 ± 7.65 respectively in group 2. The differences were significantly different(Ps ＜ 0. 01).Conclusions The tumor differentiation has significant effect on N stages,T stages,vessel carcinoma embolus,tumor size and the number of metastases lymph nodes in Esophago-gastric junction adenocarcinoma.

Objective:To preliminarily explore the association of pregnancy factors with cow's milk protein allergy in infants.Methods:This study was based on data from a subcohort of a study called ge-netic susceptibility to cow's milk allergy in Chinese children,including infants born in Peking University People's Hospital between March 1,2020,and December 31,2020.The infants were divided into a cow's milk protein allergy(CMPA)group and a control group according to whether they had developed cow's milk protein allergy at the age of 1 year.We retrospectively collected the clinical data of infants and their mothers before and during pregnancy,and analyzed the association of multiple factors during pregnancy with cow's milk protein allergy in infants.Results:A total of 278 infants were enrolled in this study,including 52 infants with CMPA and 226 infants without CMPA.Among them,there were 143 boys and 135 girls.The proportion of male infants in the CMPA group(69.2％)was higher than that in the control group(47.3％),and the difference was statistically significant(P=0.004).There were no significant differences in the distribution of birth weight,gestational age at birth,low-birth-weight in-fants,premature,umbilical cord entangle neck,and neonatal asphyxia between the CMPA group and the control group(P＞0.05).The proportion of mothers complicated with autoimmune diseases,anemia or antibiotics exposure during pregnancy in the CMPA group was higher than that in the control group,and there were statistical differences between the two groups(P＜0.05).There was no significant difference in the distribution of other pregnancy complications between the two groups(P＞0.05),such as eclamp-sia/preeclampsia,chronic hypertension/gestational hypertension,diabetes/gestational diabetes,thyroid diseases,and so on.There was no significant difference in the overall distribution of some blood routine indexes during pregnancy between the CMPA group and the control group(P＞0.05).Multivariate Lo-gistic regression analysis showed that male infant,mothers complicated with autoimmune diseases or ane-mia,antibiotic exposure during pregnancy were independent risk factors for cow's milk protein allergy.Conclusion:Male infant,mothers complicated with autoimmune diseases or anemia,antibiotic exposure during pregnancy were independent risk factors for cow's milk protein allergy.

OBJECTIVETo study the radiobiological characteristics of a HepG2 cell line with mitochondrial DNA (mtDNA) deletion.

METHODSHepG2 cells were cultured in a medium containing ethidium bromide, acetylformic acid and uracil. The HepG2 cell line with mtDNA deletion (ρ(0)HepG2 cells) were acquired after 30 subcultures by limited dilution cloning. The cell survival was then observed in the absence of acetylformic acid and uracil, and the total mtDNA deletion in the cells was confirmed by PCR. The radiosensitivity of HepG2 and ρ(0)HepG2 cells was evaluated by exposure to gradient doses of 6 MV X ray irradiation. The cell apoptosis was assessed following a 2 Gy X-ray exposure with Hochest33342 staining, and the invasiveness of ρ(0)HepG2 cells was measured by Transwell assay.

RESULTSHepG2 cells could survive 30 subcultures in the presence of ethidium bromide, and massive cell death occurred after removal of acetylformic acid and uracil from the medium. PCR confirmed total mtDNA deletion from ρ(0)HepG2 cells, whose α/β value was significantly lower than that of HepG2 cells. ρ(0)Hep-G2 cells showed an obviously lowered cell apoptosis rate following X-ray exposure with enhanced cell invasiveness.

CONCLUSIONHepG2 cells can be induced by ethidium bromide into ρ(0)HepG2 cells with an increased radiation resistance, anti-apoptosis ability and cell invasiveness.

Apoptosis ; Culture Media ; chemistry ; DNA, Mitochondrial ; genetics ; Ethidium ; chemistry ; Hep G2 Cells ; radiation effects ; Humans ; Radiation Tolerance ; genetics ; Sequence Deletion ; X-Rays

Objective:To explore the clinical features of patients with syndrome of intracranial hypotension (SIH) complicated by bilateral chronic subdural hematoma (CSDH).Methods:A case-control study was conducted; 16 patients with SIH complicated with bilateral CSDH (SIH group) and 32 patients with bilateral CSDH (non-SIH group) admitted to Department of Neurology and Neurosurgery, Shanghai Tenth People's Hospital Affiliated to Tongji University from January 2016 to October 2020 were selected. The differences of demographic characteristics, initial symptoms, medical history and CT image features between the two groups were compared.Results:(1) In 16 patients from the SIH group, 13 (81.3%) complained of typical postural headache symptoms, 3 (18.6%) showed fake subarachnoid hemorrhage on CT, 80.0% (12/15) showed dural diffuse enhancement on MRI, and 33.3% (5/15) showed signs of brain droop. Spinal MRI showed 27.3% patients (3/11) had signs of intracranial cerebrospinal fluid leakage. Of the 10 patients underwent bilateral trepanation and drainage, 6 experienced postoperative deterioration (4 received multiple additional surgeries including decompressive craniectomy, and 1 severe patient died in hospital after giving up treatment due to malignant tumor). (2) SIH group had significantly younger age, and significantly lower percentages of patients with limb weakness symptoms, hypertension, head trauma histories and increased hematoma pressure during trepanation and drainage, significantly lower age-adjusted comorbidities index, significantly decreased total and differential thickness of bilateral hematoma on CT, significantly shorter disease course, and statistically higher proportion of patients with postural headache and hematoma uniform density than non-SIH group ( P<0.05). Conclusion:According to age, initial symptoms and CT features, bilateral CSDH patients caused by SIH can be identified to a certain extent, and cranial and spinal MRI is recommended for definitive diagnosis of SIH.

BACKGROUND:Periprosthetic joint infection is one of the most unwanted complications for surgeons and patients after arthroplasty,and its recalcitrance and intractability have always been a headache for arthroplasty surgeons. OBJECTIVE:To review the latest domestic and international clinical treatments used in the treatment of periprosthetic joint infection after hip and knee arthroplasty in recent years,including antibiotic treatment,surgical treatment,biological treatment and Chinese medicine treatment,to promote the research progress in the treatment of periprosthetic joint infection in China. METHODS:The literature from January 2000 to October 2022 on CNKI,WanFang,VIP,and PubMed was retrieved by the first author.762 articles were obtained by reading the titles for initial screening,then 194 articles were obtained by reading the abstracts and excluding studies with duplicate contents,low data reliability,and outdated views.Finally,88 articles were included through intensive reading of the original text. RESULTS AND CONCLUSION:(1)Combined antibiotic regimens may help eradicate the infection in the treatment of periprosthetic infections.(2)Two-stage revision remained the golden indicator for the treatment of periprosthetic infection.(3)One-stage revision lacked large-sample clinical studies and required more clinical observation.(4)Phage therapy and newer drug delivery systems in biological therapy had been applied in small amounts in the clinic,showing their advantages in the prevention and eradication of periprosthetic infections.(5)Chinese medicine with antibiotics and surgical treatment methods can improve the prevention and treatment of periprosthetic joint infection,but high-level evidence-based medical evidence was lacking.