Objective: To investigate the barrier membrane fixation performance and enhanced guided bone regeneration (GBR) capability of a thermosensitive adhesive containing bioactive glass nanoparticles in order to provide a novel solution for membrane fixation during GBR procedures. Methods: M2NP@BGN (methoxyethyl acrylate-co-N-isopropylacrylamide-co-protocatechuic acid@Bioactive glass nanoparticle), a thermosensitive adhesive, was synthesized via free radical polymerization by compositing methoxyethyl acrylate, N-isopropylacrylamide, and protocatechuic acid into a basic adhesive that was modified with bioactive glass nanoparticle (BGN). The successful fabrication of basic adhesive M2NP was characterized by attenuated total reflection-Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. The thermosensitive adhesive M2NP@BGN (BGN concentration of 1 mg/mL) was characterized by scanning electron microscopy and a rheometer. By adjusting the BGN concentration (0.1 mg/mL, 0.5 mg/mL, 1 mg/mL, and 2 mg/mL), the adhesive and mechanical strengths were investigated with a universal testing machine. Biocompatibility was evaluated with a cell counting kit-8 assay and hemolysis test to identify the optimal formulation. The optimal material’s extract was co-cultured with mouse bone marrow mesenchymal stem cells, and its osteogenic activity was examined in vitro by quantitative real-time PCR, alkaline phosphatase, and alizarin red S staining. The rat mandibular defect model was established, filled with bone graft, and divided into 3 groups based on membrane fixation method: M2NP@BGN (BGN concentration of 1 mg/mL) fixation group (M2NP@BGN), titanium nail fixation group (Nail), and unfixed control group (Negative). Bone regeneration was analyzed after 8 weeks by micro computed tomography and histological staining. Results: M2NP@BGN (BGN concentration of 1 mg/mL) was successfully synthesized and demonstrated rapid gelation under warm, humid conditions. The adhesive with a BGN concentration of 1 mg/mL exhibited the highest adhesive strength (P < 0.001) and significantly enhanced mechanical strength (P < 0.001) under 37℃ wet conditions. All formulations showed excellent biocompatibility, with cell viability > 80% and hemolysis ratio < 5%. M2NP@BGN (BGN concentration of 1 mg/mL) significantly upregulated the expression of Runx2 and Col I (P < 0.001) and enhanced the activity of osteogenic differentiation markers (P < 0.05). In the animal model, the M2NP@BGN group (BGN concentration of 1 mg/mL) achieved significantly higher bone volume fraction and better bone maturity compared to the negative and nail groups (P < 0.05). Conclusion M2NP@BGN (BGN concentration of 1 mg/mL) combines excellent wet adhesion with potent osteogenic activity, enhances the bone augmentation efficacy of membranes, and presents a novel fixation strategy with significant clinical translation potential for GBR therapy.

[Objective] To retrospectively analyze the detection results of alanine aminotransferase (ALT) unqualified repeat blood donors in Guangzhou, so as to provide evidence for further expanding the repeat blood donor pool, reducing the rate of blood discarding and improving the qualified rate of blood test. [Methods] Blood donors with unqualified ALT in Guangzhou Blood Center from January 2018 to April 2024 were selected as the research objects. The past blood donation and population characteristics were analyzed according to the number of blood donations and ALT unqualified times. [Results] Among repeat blood donors with previous ALT disqualification, 99.5% to 99.7% did not have reactive markers for transfusion-transmitted diseases (TTD), which was higher than the rate among first-time blood donors with unqualified ALT (95.8%) (P<0.05). The rate of single-item ALT disqualification in repeat blood donors was higher in males than in females (P<0.05); it also varied by age (18-25 years > 26-35 years > 36-45 years > over 45 years) (P<0.05); and by quarter (third and fourth quarters > first and second quarters) (P<0.05). The ALT unqualified rate was significantly higher whole blood donors than that of platelet donors and returning blood donors (P<0.05). The overall ALT level (51.0 U/L), individual ALT level (56.0 U/L) and individual ALT unqualified rate (66.7%) of repeat blood donors with multiple ALT disqualifications were higher than those of repeat blood donors with single-item ALT disqualifications (26.0 U/L, 38.5 U/L, and 33.3%, respectively) (P<0.05). Moreover, as the number of ALT disqualifications increased, the overall level of ALT in repeat blood donors also increased (P<0.05), and the average level of individual ALT and individual ALT unqualified ratio tended to increase. Repeat blood donors with frequent ALT disqualifications had higher ALT levels (69.0 U/L). [Conclusion] The ALT unqualified rates of repeat blood donors were mostly non-specific elevation without TTD. Repeat blood donors with multiple ALT disqualifications tend to have continuous high ALT. Moreover, and with the increase of ALT disqualifications times, the overall ALT levels the average individual ALT levels and individual ALT unqualified rates showed an increasing trend.

[Objective] To analyze the influence of the cycle length of hepatitis B surface antigen (HBsAg) double reagent positive samples collected from voluntary blood donors in Guangzhou on the detection results. [Methods] A total of 127 044 blood samples from voluntary blood donors at Guangzhou Blood Center from August 10 to December 9, 2023 were selected. Two ELISA reagents were used for HBsAg detection, and samples with HBsAg double reagent positive and S/CO values<10 were tested continuously for 7 days to observe the changes in their S/CO values. [Results] A total of 505 HBsAg double reagent positive samples were detected, of which 52 had S/CO values less than 10. After 7 consecutive days of uninterrupted testing, the S/CO values of Wantai (median 5 decreased to 3) and Xinchuang (median 5 decreased to 3) showed an overall downward trend, and the HBsAg missed detection rate showed an upward trend (from 0 on the first day to 1/10 000 on the seventh day). A total of 13 cases had negative double reagent test results within the 7-day testing cycle. [Conclusion] With the extension of the detection cycle, the S/CO value of HBsAg detection shows a downward trend, and the missed detection rate of HBsAg shows an upward trend. Samples used for HBsAg detection should be tested promptly after sampling to improve the quality of blood testing.

Objective:To explore the clinical application value of pre-breathing mode in double-low imaging of 320-slices computed tomography(CT)for pulmonary artery.Methods:A total of 100 patients who underwent CT pulmonary angiography(CTPA)for suspected pulmonary embolism(PE)in Liuzhou People's Hospital from July 2021 to September 2022 were prospectively selected as the research subjects and they were randomly divided into observation group and control group,with 50 cases in each group.The patients of the control group adopted conventional breathing mode(the breathing password was activated after reaching the threshold,and the scan was triggered after 6 s),while the patients of the observation group adopted the pre-breathing mode(the breathing password was activated after 1 or 2 seconds,and the scan was triggered after reaching the threshold).Both two groups adopted double low-technique scan of 320 slices CT.The differences in delay time,radiation dose,the points of subjective and objective image quality,and other indicators were compared between the two groups.Results:The volume CT dose index(CTDIvol),dose length product(DLP),effective dose(ED)and delay time of the observation group were significantly lower than those of the control group(t=76.230,30.225,12.282,7.088,P<0.05),respectively.The comparison of the subjective points of image qualities between the two groups indicated that there were 25 cases with 5 points,23 cases with 4 points and 2 cases with 3 points in the observation group,and there were 21 cases with 5 points,26 cases with 4 points and 3 cases with 3 points in the control group.There was no significant difference in the averagely subjective points of image qualities between two groups(P>0.05).The signal-to-noise ratio(SNR)and signal to noise ratio(CNR)of the observation group were significantly lower than those of the control group,and the noise level(SD)of the observation group was significantly higher than that of the control group(t=25.441,23.886、11.426,P<0.05),respectively.The CT values of the artery trunk of right pulmonary,artery branch of right pulmonary,artery trunk of left pulmonary and artery branch of left pulmonary in the observation group were significantly higher than those in the control group(t=2.256,2.225,2.042,2.277,P<0.05),respectively.Conclusion:The pre-breathing mode can effectively improve CTPA image quality,and reduce radiation dose and the dosage of contrast agent,which clinical application effect is significant.It is worth learning.

Periodontitis is a chronic inflammatory and immune reactive disease induced by the subgingival biofilm.The therapeutic effect for susceptible patients is often unsatisfactory due to excessive inflammatory response and oxidative stress.Sinensetin(Sin)is a nature polymethoxylated flavonoid with anti-inflammatory and antioxidant activities.Our study aimed to explore the beneficial effect of Sin on periodontitis and the specific molecular mechanisms.We found that Sin attenuated oxidative stress and inflammatory levels of periodontal ligament cells(PDLCs)under inflammatory conditions.Administered Sin to rats with ligation-induced periodontitis models exhibited a protective effect against periodontitis in vivo.By molecular docking,we identified Bach1 as a strong binding target of Sin,and this binding was further verified by cellular thermal displacement assay and immunofluorescence assays.Chromatin immunoprecipitation-quantitative polymerase chain reaction results also revealed that Sin obstructed the binding of Bach1 to the HMOX1 promoter,subsequently upregulating the expression of the key antioxidant factor HO-1.Further functional experiments with Bach1 knocked down and overexpressed verified Bach1 as a key target for Sin to exert its antioxidant effects.Additionally,we demonstrated that Sin prompted the reduction of Bach1 by potentiating the ubiquitination degradation of Bach1,thereby inducing HO-1 expression and inhibiting oxidative stress.Overall,Sin could be a promising drug candidate for the treatment of periodontitis by targeting binding to Bach1.

Bronchopulmonary dysplasia (BPD) is a common chronic respiratory complication in preterm infants without fully understand the mechanism or effective treatment, which could significantly affect the survival rate and prognosis of these infants. Studies have confirmed that epigenetic mechanisms, including histone modification, non-coding RNA and DNA methylation may play an essential role in the onset and development of BPD. And most related epigenetic changes are reversible, which might serve as a potential target for BPD treatment. Therefore, further studies on epigenetics will shed light on a better understanding of the pathogenesis, prevention, and treatment of BPD.

Objective:To investigate the effects of different concentrations of hydrogen peroxide (H 2O 2) on the expression of histone deacetylase-2(HDAC-2) and mitogen activated protein kinases phosphatases-1(MKP-1) in A549 cells. Methods:The experimental models of A549 cells were established by intervening of different concentrations of H 2O 2(0, 100, 200, 400, 600, 800 μmol/L)for 2 h, 4 h, 8 h, 12 h and 24 h, respectively.The survival rate of A549 cells was detected by thiazolyl blue(MTT) assay, and the apoptosis of A549 cells was tested by lactic dehydrogenase(LDH) assay.The expression of HDAC-2 and MKP-1 protein was detected by Western blot. Results:(1)MTT results showed that compared with the control group (H 2O 2 was 0 μmol/L), the survival rate of A549 cells was decreased with the increase of H 2O 2 concentration at 2 h, 4 h, 8 h, 12 h, 24 h and 48 h. (2)LDH results showed that, compared with the control group, the inhibition rate of A549 cells increased with the increase of H 2O 2 concentration at 2 h, 4 h, 8 h, 12 h, 24 h and 48 h. (3)The expression of HDAC-2 protein decreased ( F=14.588, P<0.01), and the expression of MKP-1 protein increased ( F=64.297, P<0.01) in a concentration-dependent manner with the increase of H 2O 2 concentration at 12 h after H 2O 2 treatment. Conclusions:H 2O 2 participates in oxidative stress injury of lung cells by regulating the expression of HDAC-2 and MKP-1.

Objective: To investigate the characteristics, temporal trend of silicosis, and provide basis for risk assessment and precise prevention and control of occupational diseases. Methods: Using descriptive statistics to analyze the reported cases of silicosis by SPSS 20.0 software. Reported silicosis cases, the constituent ratio, the incidence age and the working age at onset were analyzed by a linear trend test. Analyzing the variation trends of regional, industry, economic type and enterprise scale distributions by the chi-square trend test. Moreover, using Moran's I method for spatial autocorrelation analysis and trend-surface analysis. Results: (1) During 2006 to 2015, Guangdong province had reported 1, 428 cases of silicosis, mainly gathered in Foshan, Zhongshan, Guangzhou, Shenzhen, which included 1391 male cases accounting for 97.41%. And the average incidence age was 45 (39, 51) . The average working age of onset was 9 (5.5, 15) . In economic type distribution, the private economy took the main part, accounting for 59.1%. In enterprise scale distribution, it was dominated by small and medium enterprises (SMEs) , accounting for 32.4% and 37.3% respectively. In industry distribution, most cases were gathered in materials and mining industry, accounting for 32.1% and 22.9% respectively. (2) The number of silicosis cases, the incidence age and the working age of onset showed a rising trend (P<0.01) . Meanwhile, the constituent ratios of medium-sized enterprises and building materials industry were increasing (P<0.05) . The annual variation trends of regional, economic type and age distributions were not statistically significant (P> 0.05) . (3) The spatial distribution trend showed an inverted U type, which was firstly raised and then declined from south to north and from east to west. The distribution characteristic demonstrated some high-high cluster areas, including Chancheng, Nanhai, Shunde, Panyu, Dongguan, Pengjiang, and Zhongshan. While Wuhua showed a high-low outlier form (P<0.01) . Conclusion Silicosis cases, age and working age of onset were on the rise, as well as the industry and enterprise scale distributions of occupational diseases presented a certain trend in Guangdong province from 2006 to 2015. There were high-high cluster and high-low outlier phenomena in spatial distribution with spatial correlation. Therefore, our work of silicosis epidemic trend and distribution may provide some bases for the occupational disease risk assessment and control.

OBJECTIVE: To investigate the applicability of EuroQol 5-Dimension 3-Level questionnaire (Chinese Version 1.0) (EQ-5D-3L) in the assessment of life quality of patients with idopathic sudden hearing loss. METHOD: In this retrospect study, the EQ-5D-3L was assigned to 60 patients with idopathic sudden hearing loss before and after drug therapy. Audiometry examinations were undertaken and concomitant symptoms were recorded. A Wilcoxon rank sum test was applicated to the comparisons of results of EQ-5D-3L before and after the treatment, a t-test for results of EQ-VAS and a Kappa measurement for the consistency of certain dimension correlated with the symptoms. RESULT: Sixty patients completed the five questions and visual analog scale of the EQ-5D. A statistically significant changes of pain/discomfort, anxiety/depression before and after the treatment were observed (P < 0.05). The domains of mobility, self-care and usual activities did not show statistically significant different (P > 0.05). The dimension of pain/discomfort was in agreement with the concomitant symptoms. And the result of EQ-VAS was in agreement with the therapeutic outcome. CONCLUSION It is suitable for the EQ-5D to be a general health measure with sensitivity to clinical change in idiopathic sudden sensorineural hearing loss, which monitors the patients' outcomes.
Depression ; Hearing Loss, Sensorineural ; diagnosis ; Humans ; Quality of Life ; Self Care ; Surveys and Questionnaires ; Treatment Outcome ; Visual Analog Scale

OBJECTIVE: To explore the clinical characteristics, diagnosis method and treatment of petrous apex cholesteatoma. METHOD: A retrospective analysis was taken with respects to the clinical characteristics, diagnosis and surgical management of 38 patients who underwent surgery for petrous apex cholesteatoma in our department. RESULT: (1)31 patients had unilateral hearing loss and facial paralysis of different degree, 27 patients were firstly characterized with hearing loss, and followed by facial paralysis. 6 cases had facial paralysis as the main performance. (2)17 patients had syndrome of tinnitus, and 15 patients had syndrome of vertigo and 4 cases of severe pain of ear. (3)All patients had petrous bone destroy with high resolution CT scan, while MRI suggests the presence of pathological changes in petrous apex. (4)All patients were taken surgeries to remove the lesion, and translabyrinth approach was chosen for 23 patients, middle cranial fossa approach is 12, while 3 case has choose endoscopic approach. 8 cases were operated with facial nerve decompression. 7 cases was taken end to end anastomosis. 3 cases of great auricular nerve transplantation. There is no recurrence in follow-up of 1 years to 2 years. CONCLUSION The clinical manifestations of petrous apex cholesteatoma lack specificity, and high resolution CT and MRI has important value in the diagnosis of petrous apex cholesteatoma. The strategy of surgical operation should be taken according to the classification, location of petrous apex cholesteatoma as well as hearing level and facial nerve function with patients.
Cholesteatoma ; pathology ; surgery ; Cranial Fossa, Middle ; Decompression, Surgical ; Facial Nerve ; Facial Paralysis ; Hearing Loss ; Hearing Loss, Unilateral ; Humans ; Magnetic Resonance Imaging ; Petrous Bone ; Recurrence ; Retrospective Studies ; Tomography, X-Ray Computed