Ceramides ; physiology ; Physiological Phenomena ; radiation effects ; Ultraviolet Rays

Objective To study the degradation of hepatitis C virus(HCV) genome before and after methylene blue photochemistry(MB-P) treatment of the plasma.Methods MB was added to HCV positive plasma to a final concentration of 1.0?mol/L.The plasma was then exposed to 30000 Lux fluorescence.Plasma samples were then collected at different times of exposure.Real-time PCR was used to quantitatively study the course of the HCV-RNA degradation.The whole genome was screened for integrity by RT-PCR with 8 pairs of specific primers which targeted sequential overlapping sections of HCV genome.Results Results of real-time PCR showed that the copy number of HCV-RNA was continuously decreasing during MB-P treatment.RT-PCR results showed that the reactivity of different sections of the HCV genome to MB-P was significantly different and indicated that the 5' end and 3' end were more stable. Conclusion MB-P treatment could degrade HCV RNA with various sensitivities to different sections of the genome.RNA degradation may play an important role in plasma virus inactivation.Detection of HCV genomic RNA might be clinically useful to monitor the process and efficiency of virus inactivation.

Objective:To explore the protective cognition of the first batch of nurses against novel coronavirus pneumonia on apparatus-related stress injury, so as to provide reference for formulating and implementing relevant training and improving management measures.Methods:Using the phenomenological method of qualitative research, from January 20, 2020 to February 17, 2020, a half structured in-depth interview was conducted among the echelon nurses who completed the first batch of nurses against novel coronavirus pneumonia on apparatus-related stress injury. A total of 13 nurses in isolation wards were interviewed for the study.Results:Using the method of Colaizzi phenomenology to analyze the interview data, the related knowledge cognition was low, the identification of risk factors was limited, the risk assessment was not carried out, the treatment measures were not timely, the awareness of protection was lacking, the management training was not perfect, and the medical protection materials were not enough.Conclusion:The first batch of nurses to fight against novel coronavirus pneumonia had a low awareness of the prevention of medical device-related stress injury. Hospital managers should strengthen the training of related knowledge, improve management strategies, enhance the awareness of protection, and identify risk factors early, take preventive measures to ensure the safety and health of front-line medical staff in a timely manner.

Objective To investigate the spatial learning and memory ability,the changes of indicators of oxidative stress,and their relationship in transgenic APP/PS1 mouse model of Alzheimer's disease(APP/PS1 mice). Methods The spatial learning and memory ability were assessed by Morris water maze test,and the activity or content of SOD, GSH-PX, MDA, and protein carbonyl in brain tissues were measured by ELISA in the APP/PS1 and wild type (WT) mice. Furthermore, the relationship between the learning and memory performances and the indicators of oxidative stress was examined. Results No significant difference in the spatial learning was observed between the APP/PS1 and WT mice (P ＜0. 05). The spatial memory which was measured as the percentage of time traveling in the targeted quadrant to the total traveling time was significantlydeclined in the APP/PS1 mice(29. 02 ± 4. 27) % as compared with the WT mice(47. 39 ± 6. 01) %(t =0. 000 ,P ＜0. 05). The percentage of length of traveling in the targeted quadrant to the total length traveled was significantly lower in the APP/PS1 mice(28. 85 ±3.77)% compared with the WT mice(46. 70 ±5.60)% (t =0. 000,P ＜0. 05). These findings indicated that the spatial learning and memory ability of APP/PS1 mice was significantly decreased compared to WT mice. There was no significant difference in activity or content of SOD,GSH-PX,and MDA in brain tissues between the APP/PS1 and WT mice (P ＜ 0. 05), while the content of protein carbonyl was significantly elevated in the APP/PS1 mice (2. 67 ±0. 19) than in the WT mice (2. 38 ±0. 15)(t = 0. 008, P ＜ 0. 05). Correlation analysis revealed that the elevated protein carbonyl was negatively correlated with the percentage of length traveled in the targeted quadrant(r = - 0. 639, P ＜ 0. 05) and the percentage of time traveled in the targeted quadrant(r = - 0. 636 ,P ＜ 0. 05). Conclusion The spatial memory impairment was negatively correlated with the elevated protein carbonyl in the APP/PS1 mice, suggesting that protein carbonylation caused by oxidative stress might play an important role in the development of memory impairment in the early stage of Alzheimer's disease.

Objective To investigate the role of BMSCg on enhancing the implant survival and bacheal epithelium regeneration. Methods After transplanted with cryopreserved 2 weeks and 6 weeks allocraft, PHK-26 labeled 3-5 passage BMSCs were injected into the recipient rats via tail vein. Rats in the control groups were injected with the same amount of PBS.We observed the histology of the transplanted trachea including epithelium growth and regeneration, and the PKH-26 fluorescence levels at the para-anastomotic trachea to evaluate the role of BMSC transplantation on the epithelium regeneration. Results Rats from BMSCs injection group survived a long period. Histological observation showed that the tracheal lumen was covered by psudo-striated ciliated columnar epithelium. The cartilage structure was intact. There are no signs of denaturation and necrosis. In the PBS injection group, epithelium regeneration is better in PBS-6-week group than PBS-2-week group. The longest survival time in PBS-6-week group was 32 days, whereas it was 10 days in PBS-2-week group. In BMSCs injection group, rats in BMSC-6-week groups survived longer than 8-week group(12 rats were terminated at 1 week, 4 weeks and 8weeks as planned). There was one rat who survived and were terminated at the designated 8 weeks time point (there were 8regenerated epithelium was similar in the two BMSC transplanted groups. PKH-26 labeled BMSCs migrated to the implant site and showed red fluorescence, with most red fluorescence shown at the anastomotic part. Conclusion BMSCs can migrate to the impaired tissue to repair it. BMSCs may exert their reparation function via enhancing epithelium regeneration.

Objective To evaluate the remission situation of early re-induction with priming low dose regimen containing G-CSF in treating acute myeloid leukemia (AML).Methods Ninety-seven AML patients in our hospital from March 2015 to January 2017 were retrospectively analyzed.All cases adopted the standard DA regimen for conducting the induction chemotherapy,among them,38 cases had significant residual disease on 14 d of induction chemotherapy,21 cases adopted the low dose priming regimen for conducting the early re-induction chemotherapy,17 cases adopted the tandard DA gregimen for conducting the re-induction chemotherapy.The complete remission(CR) rate and and adverse reactions were compared between two groups.Results The total CR rate in all 97 cases was 60.8％;among 38 cases needing re-induction chemotherapy,the CR rate in the priming regimen re-induction group was 76.2 ％,which was significantly higher than 41.2 ％ in the DA regimen re-induction group,the difference was statistically significant (P=0.028);the occurrence rates of side effects such as infection and cytopenia during re-induction chemotherapy process had no difference between two groups(P＞0.05).Conclusion For AML patients with obvious residual disease on 14 d of induction chemotherapy,adopting low dose priming regimen in re-duction chemotherapy has higher CR,which is superior to the standard DA regimen.

Objective: To investigate the effects of the interaction between occupational noise exposure and arterial stiffness on blood glucose, so as to provide insights into for early prevention of diabetes among workers exposed to occupational noise. Methods: A total of 518 noise workers were selected from a tobacco plant in Wuhan City. Participants' gender, age and work duration were collected using questionnaire surveys, and participants' height and weight were measured. Blood glucose and arterial stiffness were detected, and the noise intensity was measured in working environments with a personal noise dosimeter. The effects of occupational noise exposure, arterial stiffness and their interactions on blood glucose were examined using a multiple linear regression model. Results: A total of 518 workers were included, with 398 males (76.83%), a mean age of (40.85±10.68) years, a mean working age of (19.50±12.69) years, a mean body mass index of (23.66±3.31) kg/m2, and a mean blood glucose level of (5.15±0.99) mmol/L. There were 247 workers with occupational noise exposure (47.68%) and 175 workers with arterial stiffness (33.78%). Multiple linear regression analysis showed significant associations of noise (β'=0.112) and arterial stiffness (β'=0.168) with blood glucose, and there was an additive interaction between noise and arterial stiffness on blood glucose (β'=0.314). Conclusion The interaction between occupational noise and arterial stiffness affects blood glucose.

Objective:To investigate frequency of blood stasis syndrome(BSS) defined by traditional Chinese medicine in cerebral infarction and its correlations with carotid atherosclerotic plaque(CAP).Methods: All subjects comprised 151 patients aged 40 to 80 years(Mean ? SD age,65 ?11 years) with 67.9% for males and 32.1% for females.With the use of ACUSON7 color Doppler ultrasound,carotid atherosclerosis was evaluated by the plaque score,the left plaque score,the right plaque score,the numbers of the plaque respectively as defined by the sum of all plaque heights in bilateral carotid arteries.On the basis of neurological signs and symptoms,medical history,and brain MRI,we diagnosed stroke and its subtypes as follows: stroke(n=117),and vertebrobasilar insufficiency(VBI)(n=34) without the history of the stroke,which were based on Diagnostic Criteria for Cerebral Vascular Diseases in 2005.Diagnosis for syndromes defined by traditional Chinese medicine were made according to Diagnostic Criteria for Stroke in 1994.One-way ANOVA was used in comparison between groups,and multivariant Logistic Regression Analysis was conferred in correlations between several variables.Results: 47.0% of all cases with cerebral infarction presented the BSS,with as lower than syndrome of fire-heat(51.0%),as but significantly higher than syndrome of Qi deficiency(32.0%),liver-wind syndrome(27.0%),phlegm syndrome(23.0%) and syndrome of asthenic yin causing predominant yang(6.0%).There is a significant difference between groups for 44(79.0%) cases of 56 patients with cerebral infarction and the BSS have CAP,and only 35(57.0%) cases of 61 patients with cerebral infarction but without the BSS have CAP(P

Objective:To evaluate the biological characters of C57-TgN(HBV adr2.0)SMMU transgenic mice. Methods: Integration,expression,replication and histology change of hepatitis B virus gene in F6 transgenic mice were estimated by ge-nomic DNA PCR,Western blotting,ELISA,immunohistochemistry,serum DNA PCR,transmission electron microscopy and H-E staining. Results: Hepatitis B virus gene was integrated into F6 C57-TgN(HBV adr2. 0)SMMU transgenic mice and expressed HBsAg,HBcAg and X protein in liver tissue. HBsAg and HBeAg were expressed in serum of 19. 54% and 3. 39% F6 transgenic mice. Hepatitis B virus were replicated in serum and liver tissue of transgenic mice. Long-term integration,expression and replication of hepatitis B virus gene induced pathological lesion of transgenic mice liver and lung. Conclusion: C57-TgNCHBV adr2. 0)SMMU transgenic mice line has the biological characters including integration of hepatitis B virus gene into genomic DNA,expression and replication of hepatitis B virus gene in serum and liver, and histological change in liver and lung. It is a valuable animal system to study pathogenesis, treatment and prevention of hepatitis B virus.

Objective:To investigate the killing effects in vitro of a new photosensitizer black titanium dioxide b-TP-700-mediated photodynamics on prostate cancer cell line PC-3 cells.Methods:The b-TP-700 was successfully prepared by using solid phase in situ thermal reduction method. PC-3 cells were treated with 31.25, 62.5, 125, 250, 500, 1 000 μg/ml b-TP-700 for 12, 24, 48 h. The cell activity was detected by using CCK-8 method, and the morphology of PC-3 cells was observed by using confocal fluorescence microscope, the toxicity of b-TP-700 to PC-3 cells was also judged. PC-3 cells were treated with different concentrations of b-TP-700 (31.25, 62.5, 125, 250, 500 μg/ml) and irradiated with laser (1 W/cm, 808 nm) for 1, 3, 5, 7 min. The cell activity was detected by using CCK-8 method. The production of reactive oxygen species in PC-3 cells cultured in 250 μg/ml b-TP-700 after laser irradiation for 5 min was detected by using confocal fluorescence microscopy. The non-laser irradiation cells were selected as the control group.Results:There were no statistically significant differences in cell activity of PC-3 cells treated with different concentrations of b-TP-700 for the same time ( F value was 1.26, 0.39 and 0.37, respectively; all P > 0.05). PC-3 cells were treated with 1 000 μg/ml b-TP-700 for 24 h, no obvious morphological changes and no obvious dead cells were observed under fluorescence microscope. When PC-3 cells were treated with the same concentration of b-TP-700, the activity of PC-3 cells was decreased with the extension of laser excitation time. Under the same laser excitation time, the activity of PC-3 cells was decreased with the increase of b-TP-700 concentration (all P < 0.05). Under laser irradiation, obvious green fluorescence could be detected in the PC-3 cells treated with 250 μg/ml b-TP-700, while almost no green fluorescence could be observed in the control group. Conclusions:A new photosensitizer b-TP-700 has the good reactive oxygen generation ability. b-TP-700-mediated photodynamics show obvious killing effects on prostate cancer PC-3 cells in vitro, which is expected to be a new method for the treatment of prostate cancer.