BACKGROUND:Polyurethane has good mechanical and physical characteristics and is extensively used in
clinical and experimental studies, but its hydrophobicity and histocompatibility are not ideal, which limits its use in tissue engineering as a biomaterial scaffold to some extents.
OBJECTIVE:To observe the hydrophilicity of polyurethane membrane grafted with silk fibroin and glutin and its compatibility with human hypopharyngeal cel s.
METHODS:The changes in hydrophilicity of polyurethane membrane grafted with silk fibroin and glutin were detected by contact angle measurements. Human hypopharyngeal fibroblasts were cultured in vitro on
polyurethane membrane, silk fibroin-polyurethane membrane, glutin-polyurethane membrane and tissue culture plate. Cel compatibility was compared using cytometry and cel morphology obsevation.
RESULTS AND CONCLUSION:Hydrophilicity of silk fibroin-or glutin-polyurethane membranes significantly increased (P<0.01). The hydrophilicity of silk fibroin-polyurethane membrane was higher than that of
glutin-polyurethane membrane (P<0.01). The number of cel s on the tissue culture plate was the most. The number of human hypopharyngeal fibroblasts on the silk fibroin-or glutin-polyurethane membrane was higher
than that on the polyurethane membrane, especial y on the silk fibroin-polyurethane membrane. These suggested that hydrophilicity and cel compatibility of silk fibroin-or glutin-polyurethane membrane were elevated.

Aim To observe the effect of BAPTA-AM on extracellular acid-induced autophagy in rat articular chondrocytes and its possible mechanisms.Methods Rat articular chondrocytes were isolated from Sprague-Dawley rats and incubated with different pH medium. The states of autophagy were examined by acridine or-ange (AO ) staining .Moreover,the expressions of LC3 ,Beclin-1 ,ULK1 ,CaMKKβ,AMPK and mTOR were detected using Western blot or quantitative real-time PCR (qRT-PCR ). Intracellular calcium ([Ca2+]i )was analyzed by a Ca2+-imaging method. Results Compared with pH 6.0 group,BAPTA-AM could significantly decrease the activation of autophagyinduced by acid exposure,and the expressions of autophagy markers including LC3 Ⅱ,Beclin1 and ULK1were also decreased,accompanied with reduced acidinduced [Ca2 +]i influx,decreased proteins expressionof CaMKKβand phosphorylatedAMPK,and increasedphosphorylation of mTOR.Conclusion BAPTAAMcan significantly restrain acidinduced autophagy in ratarticular chondrocytes,the mechanism of which may beassociated with decreased Ca2 + influx.

Objective To study classification of vascular sign of tiny ground glass nodules-like lung adenocarcinoma in HRCT, and explore its value to differentiate benign from malignant of the ground glass nodules(GGN).Methods 87 patients with tiny ground glass nodules-like lung adenocarcinoma examined on HRCT were retrospectively evaluated.According to the new pathological classification standard of lung adenocarcinoma,they were divided into three groups:(1)pre-invasive group(n=25),including 14 cases of atypical adenomatous hyperplasia(AAH)and 11 cases of adenocarcinoma in situ(AIS);(2)minimally invasive adenocarcinoma (MIA)group(n=35);(3)invasive adenocarcinoma(IAC)group(n=27).The lesions were divided into three types according to the grinding of glass composition proportion:Type A,pure ground glass nodules(pGGN);Type B,mixed ground glass nodules (mGGN)which contained glass composition≥50%;Type C,mGGN which contained glass composition < 50%.The vascular sign of GGN were divided into four types:Type 1,without vessels passing through the GGN,or vessels passing by GGN;Type 2,intact vessels passing through GGN,but vascular morphology is normal;Type 3,single vessels passing through GGN,and distorted,stiff vessels seen within GGN;Type 4,two or more vessels passing through GGN,and branches between vessels formed in GGN,and the diameter of vessel was irregular,partial enlargement.The relationship among the size of the GGN,content of the grinding of glass proportion and the vascular sign of GGN were analyzed both in axial images and reconstruction images.Results There were significant differences in size among the three groups(P=0.032,P=0.000,P=0.000).There were significant differences between content of the grinding of glass proportion and classification of vascular sign of GGN(P=0.000).Type 1 and type 2 vascular sign were dominant in the infiltrating former group,a total of 24 cases(96%).The incidence of type 3 and type 4 vascular sign in MIA group and IAC group was 60% and 74% respectively,and there were significant differences with the infiltrating former group(P=0.000,0.000).Further analysis indicated that type 3 was more commonly seen in MIA with comparison to type 4 which was more likely seen in IAC,the difference was statistically significant(P=0.043).Conclusion To study HRCT vascular sign of tiny ground glass nodules-like lung adenocarcinoma can improve the ability of the GGN benign and malignant diagnosis,provide reliable basis for clinical diagnosis and treatment.

【Objective】 To analyze the related factors and countermeasures of adverse reactions to whole blood donation(ARBD) for medical student donors, so as to further reduce the incidence of ARBD. 【Methods】 The demographic data of medical/non-medical student donors and those suffered from ARBD from 2016 to 2018 were retrospectively analyzed, and the relationship between ARBD and age, gender, frequency of blood donation, blood volume, blood type, pulse, ALT, blood pressure, hemoglobin, etc. was statistically analyzed. 【Results】 The incidence of ARBD in all medical student donors from 2016 to 2018 was 1.16%, lower than that of non-medical students (1.51%). The ARBD rate(2.30%) of senior medical students (> 20 years old) was significantly lower than that of non-medical students (3.93%) and higher than that of junior medical students (≤20 years old)(0.70%). The ARBD rate of novel medical student donors was 1.27%, lower than that of novel non-medical students (2.12%) (P<0.05). Male medical students(1.68%) were more likely to develop ARBD than females(0.78%), donations within 200 mL(55%) than 300mL(0.26%) and 400mL(0), Hb<120 g/L(13.04%) than Hb≥120 g / L( 1.10% ), and blood type A(1.70%) than type O (0.88%) (P<0.05). Logistic regression analysis showed that blood volume and blood type were related factors. ARBD was more likely to occur in Type A blood than type O, and was more likely to occur when blood volume was lower. ARBD occurred frequently during phlebotomy, due to mental stress(75%) and hunger(8.92%)(P<0.05), while 96.43% of ARBD could recover within 10 minutes. 【Conclusion】 Novel, male, older than 20 years, Hb<120 g / L, blood type A and donation unit ≤200 mL were main risks for ARBD in medical student donors. Popularizing the knowledge of voluntary blood donation and strengthening pre-donation communication are important measures to prevent ARBD.

ObjectiveTo provide a reference for the diagnosis of amyloidosis in experimental animals through the pathological diagnosis of systemic amyloidosis in a case of a New Zealand white rabbit. MethodsIn a 6-month repeated ocular toxicity study, an abnormal finding was noted during the routine gross anatomical examination of one New Zealand white rabbit. Its organs were prepared as paraffin sections and stained with hematoxylin-eosin (HE) staining and Congo red staining. The histopathological features were observed under optical and polarized light microscopy. ResultsGross anatomical examination of the animal revealed an enlarged spleen and changes in the color and texture of the lung. HE staining showed that the splenic tissue structure was destroyed, the white pulp of the spleen was surrounded by dense amyloid deposition in the form of nodular rings, along with pressure atrophy of the white pulp. Amyloid deposits were also observed in the submandibular lymph nodes, mesenteric lymph nodes, ileum, sacculus rotundus, vermiform appendix, jejunum, cecum, and rectum. Congo red staining showed that the amyloid deposition in the affected organs appeared salmon-pink, and exhibited characteristic apple green birefringence under polarized light microscopy.Conclusion The histo-pathological features of the New Zealand white rabbit are consistent with the diagnostic characteristics of systemic amyloidosis.