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1.
Intensive Care Med Exp ; 12(1): 12, 2024 Feb 09.
Article in English | MEDLINE | ID: mdl-38332384

ABSTRACT

Acute respiratory distress syndrome (ARDS) is the primary cause of respiratory failure in critically ill patients. Despite remarkable therapeutic advances in recent years, ARDS remains a life-threatening clinical complication with high morbidity and mortality, especially during the global spread of the coronavirus disease 2019 (COVID-19) pandemic. Previous studies have demonstrated that mesenchymal stem cell (MSC)-based therapy is a potential alternative strategy for the treatment of refractory respiratory diseases including ARDS, while extracorporeal membrane oxygenation (ECMO) as the last resort treatment to sustain life can help improve the survival of ARDS patients. In recent years, several studies have explored the effects of ECMO combined with MSC-based therapies in the treatment of ARDS, and some of them have demonstrated that this combination can provide better therapeutic effects, while others have argued that some critical issues need to be solved before it can be applied to clinical practice. This review presents an overview of the current status, clinical challenges and future prospects of ECMO combined with MSCs in the treatment of ARDS.

2.
Front Med (Lausanne) ; 10: 1152732, 2023.
Article in English | MEDLINE | ID: mdl-37448807

ABSTRACT

Objective: To explore the effect of the application of the 'Internet+' nursing teaching mode on the comprehensive teaching 'Fundamentals of Nursing'. Trial design: Parallel design and convenient sampling were used to select vocational nursing students from the Nursing College of Capital Medical University. Methods: Selected students were randomly divided into two groups. The control group consisted of 30 students in Grade 2020 higher vocational nursing education (traditional teaching mode). The observation group consisted of 30 students in Grade 2021 higher vocational nursing education (Internet+ mixed teaching mode). Training assessment results, automatic learning ability, professional identity, and satisfaction were compared between the two groups. Results: Compared with the control group, the students in the observation group scored higher in the following operation practices: venous blood sampling, intradermal injection, cardiopulmonary resuscitation (CPR), sputum aspiration, and putting on and taking off robes (84.01 ± 0.87 vs. 92.14 ± 1.23; 91.41 ± 0.82 vs. 96.86 ± 0.27; 87.56 ± 0.31 vs. 93.91 ± 2.79; 88.11 ± 0.51 vs. 93.75 ± 0.29; and 82.29 ± 0.29 vs. 90.96 ± 0.34, respectively, with p < 0.05 for all scores). The total scores for autonomous learning ability and subjective satisfaction were also higher in the observation group compared with the control group (82.98 ± 4.72 vs. 93.17 ± 5.01 and 96.67% vs. 90.00%, respectively, with p < 0.05 for all scores). Conclusion: In the post-epidemic era, the 'Internet+ hybrid teaching mode' was applied to comprehensive nursing teaching. This changed the traditional education mode, which focuses only on professional knowledge. The 'Internet+' teaching mode results showed that the professional, ideological, and political courses exhibited the same value guidance, which improved students' independent learning ability, practical operation ability, professional identity, and satisfaction.

3.
Lancet Respir Med ; 11(8): 698-708, 2023 08.
Article in English | MEDLINE | ID: mdl-37209700

ABSTRACT

BACKGROUND: Heterologous booster immunisation with orally administered aerosolised Ad5-nCoV vaccine (AAd5) has been shown to be safe and highly immunogenic in adults. Here, we aimed to assess the safety and immunogenicity of heterologous booster immunisation with orally administered AAd5 in children and adolescents aged 6-17 years who had received two doses of inactivated vaccine (BBIBP-CorV or CoronaVac). METHODS: We did a randomised, open-label, parallel-controlled, non-inferiority study to assess the safety and immunogenicity of heterologous booster immunisation with AAd5 (0·1 mL) or intramuscular Ad5-nCoV vaccine (IMAd5; 0·3 mL) and homologous booster immunisation with inactivated vaccine (BBIBP-CorV or CoronaVac; 0·5 mL) in children (aged 6-12 years) and adolescents (aged 13-17 years) who had received two doses of inactivated vaccine at least 3 months earlier in Hunan, China. Children and adolescents who were previously immunised with two-dose BBIBP-CorV or CoronaVac were recruited for eligibility screening at least 3 months after the second dose. A stratified block method was used for randomisation, and participants were stratified by age and randomly assigned (3:1:1) to receive AAd5, IMAd5, or inactivated vaccine. The study staff and participants were not masked to treatment allocation. Laboratory and statistical staff were masked during the study. In this interim analysis, adverse events within 14 days and geometric mean titre (GMT) of serum neutralising antibodies on day 28 after the booster vaccination, based on the per-protocol population, were used as the primary outcomes. The analysis of non-inferiority was based on comparison using a one-sided 97·5% CI with a non-inferiority margin of 0·67. This study was registered at ClinicalTrials.gov, NCT05330871, and is ongoing. FINDINGS: Between April 17 and May 28, 2022, 436 participants were screened and 360 were enrolled: 220 received AAd5, 70 received IMAd5, and 70 received inactivated vaccine. Within 14 days after booster vaccination, vaccine-related adverse reactions were reported: 35 adverse events (in 13 [12%] of 110 children and 22 [20%] of 110 adolescents) in 220 individuals in the AAd5 group, 35 (in 18 [51%] of 35 children and 17 [49%] of 35 adolescents) in 70 individuals in the IMAd5 group, and 13 (in five [14%] of 35 children and eight [23%] of 35 adolescents) in 70 individuals in the inactivated vaccine group. Solicited adverse reactions were also reported: 34 (13 [12%] of 110 children and 21 [10%] of 110 adolescents) in 220 individuals in the AAd5 group, 34 (17 [49%] of 35 children and 17 [49%] of 35 adolescents) in 70 individuals in the IMAd5 group, and 12 (five [14%] of 35 children and seven [20%] of 35 adolescents) in 70 individuals in the inactivated vaccine group. The GMTs of neutralising antibodies against ancestral SARS-CoV-2 Wuhan-Hu-1 (Pango lineage B) in the AAd5 group were significantly higher than the GMTs in the inactivated vaccine group (adjusted GMT ratio 10·2 [95% CI 8·0-13·1]; p<0·0001). INTERPRETATION: Our study shows that a heterologous booster with AAd5 is safe and highly immunogenic against ancestral SARS-CoV-2 Wuhan-Hu-1 in children and adolescents. FUNDING: National Key R&D Program of China.


Subject(s)
COVID-19 , Adult , Humans , Child , Adolescent , SARS-CoV-2 , Vaccines, Inactivated , Antibodies, Neutralizing
4.
Front Pediatr ; 11: 1144373, 2023.
Article in English | MEDLINE | ID: mdl-37063674

ABSTRACT

Background: Premature rupture of membranes (PROM) is a common cause of extremely premature infants (EPIs) and also leads to adverse preterm complications. However, the effect of PROM on EPIs remains contradictory. This study used propensity score matching (PSM) to adjust the baseline characteristics to explore the impact of PROM on clinical outcomes of extremely premature infants (EPIs). Methods: Medical data of 470 EPIs at gestational age < 28weeks who received prenatal examination in our hospital between January 1, 2015 and December 31, 2020 were analyzed retrospectively. According to the presence or absence of PROM, they were divided into a PROM group and a non-PROM group. Ten covariates including birth weight, male sex, artificial conception, cesarean delivery, 5-min Apgar score ≤ 7, oligohydramnios, gestational hypertension, preeclampsia, antenatal steroid use, and complete steroid treatment were matched 1:1 by PSM. The major complication occurrence and mortality during hospitalization were compared between the two groups by t-test, nonparametric test or x 2 test. Results: Among the 470 infants enrolled, 157 (33.4%) were in the PROM group and 313 in the no-PROM group. After matching the ten confounding factors,276 cases were successfully enrolled. The incidence of early pulmonary hypertension (EPH) and severe retinopathy of prematurity (ROP) in the PROM group were higher than those in the no-PROM group [44.2% (61/138) vs. 29.0% (40/138); 34.8% (48/138) vs. 21.7% (30/138), x 2 = 6.886 and 5.790, both P < 0.05]. However, there was no significant difference in the in-hospital mortality and the incidence of other major complications between the two groups (all P > 0.05). Conclusions: PROM increased the incidence of EPH and severe ROP in EPI, but had no significant impact on in-hospital mortality, length of hospital stay, and the incidence of other complications.

5.
BMC Ophthalmol ; 23(1): 137, 2023 Apr 04.
Article in English | MEDLINE | ID: mdl-37016343

ABSTRACT

OBJECTIVE: To compare post-treatment recurrence between ranibizumab injection and laser photocoagulation (LP) for type 1 retinopathy of prematurity (ROP), and explore the associated risk factors. METHODS: The clinical data of ROP infants treated with LP or ranibizumab in a NICU of China from October 2007 to November 2021 were retrospectively analyzed and compared, such as general condition, degree of ROP, therapeutic effectiveness and post-treatment recurrence. The dependent variable was recurrence after ROP treatment. Univariate and regression analysis of risk factors was performed. RESULTS: Of the 298 ROP infants (556 eyes), 58% of the eyes were treated with LP and the other 42% with ranibizumab. There was no significant difference in gestational age at birth, birth weight, sex, delivery mode, prenatal corticosteroids, ROP diagnosed before admission or after admission, and the duration of oxygen therapy between the two groups. However, the ratio of type 1 ROP and aggressive retinopathy of prematurity (A-ROP) in ranibizumab group was higher than that in LP group. The number of treatments, recurrence rate and recurrence interval in ranibizumab group were higher than those in LP group. However, there was no difference in the recurrence rate between the two groups after stratified analysis by the lesion area and the presence or absence of A-ROP. There was no significant difference in the final lesion regression between the two groups. Regression analysis showed that plus disease and ROP located in zone I were independent risk factors for post-treatment recurrence. CONCLUSION: There is no significant difference in the recurrence rate of ROP between ranibizumab injection and LP, and recurrence is mainly related to the severity of ROP. In half of our patients treated with A-ROP recurrences occur.


Subject(s)
Ranibizumab , Retinopathy of Prematurity , Infant, Newborn , Infant , Humans , Ranibizumab/therapeutic use , Angiogenesis Inhibitors/therapeutic use , Retinopathy of Prematurity/drug therapy , Retinopathy of Prematurity/surgery , Retrospective Studies , Intravitreal Injections , Laser Coagulation , Gestational Age , Lasers , Treatment Outcome
6.
Mycopathologia ; 188(1): 1, 2023 Jan 18.
Article in English | MEDLINE | ID: mdl-36652037

ABSTRACT

We report infant zigzag hairs as a distinct trichoscopic sign for follow up a case of pet-related newborn tinea capitis due to Microsporum canis. Formation of infant zigzag hairs due to ectothrix M. canis infection may be associated soft neonatal widespread thin hair, which is different from vellus hair and terminal hair. In addition, tinea capitis was further confirmed by transmission electric microscopy and fungal culture. The patient was successfully treated by weekly oral fluconazole (8 mg/kg). Therefore, the handheld dermoscopy is a simple, non-invasive and very inexpensive technique for the diagnosis and follow-up of tinea capitis, especially for infant.


Subject(s)
Dermoscopy , Tinea Capitis , Infant , Infant, Newborn , Humans , Follow-Up Studies , Dermoscopy/methods , Tinea Capitis/diagnosis , Tinea Capitis/microbiology , Microsporum , Hair , Early Diagnosis
7.
Mycopathologia ; 187(2-3): 189-197, 2022 Jun.
Article in English | MEDLINE | ID: mdl-35445313

ABSTRACT

Deep cutaneous fungal infections including deep dermatophytosis are responsible for significant morbidity and mortality, especially in immunocompromised patients. Variable and longer turnaround time on tissue culture results delay diagnosis. We sought to seek the fast bedside diagnosis for disseminated deep dermatophytosis by direct microscopy using a blunt scalpel or needle aspiration before biopsy. This is a 6-year retrospective review of patients with a diagnosis of disseminated deep dermatophytosis seen at a single tertiary care institution. Trichophyton rubrum was isolated in four patients, and T. mentagrophyte complex in one patient. All the dermatophyte isolates can grow at 37 °C. Microscopy of purulence sampling from intact nodules demonstrated abundant septate hyphae, and also isolation from purulence was concordance with skin tissue culture. Ultrasound-guided sampling from non-eroded can yield purulence, and direct microscopy of purulence may facilitate rapid diagnosis of deep dermatophytosis and serve to prevent disease progression and dissemination.


Subject(s)
Dermatomycoses , Mycetoma , Tinea , Humans , Immunocompromised Host , Skin/microbiology , Tinea/diagnosis , Tinea/microbiology , Trichophyton
8.
Diagn Microbiol Infect Dis ; 101(4): 115533, 2021 Dec.
Article in English | MEDLINE | ID: mdl-34587571

ABSTRACT

In the present report, we describe an unusual case of mixed infection of Candida albicans and Talaromyces marneffei in the oral cavity and oropharynx with cutaneous involvement. On the CHROMagar Candida plate, green colonies (identified as C. albicans) and tiny violet colonies (identified as T. marneffei) grew from the throat swab after incubation for 96 hours. 10 clinical isolates of T. marneffei were used to verify their color production on CHROMagar Candida. All colonies were violet on the fourth, seventh and ninth day incubated at 37 °C. T. marneffei appears violet on the CHROMagar Candida plate, but it may be easily ignored because of its slow growth and small colony size, especially after incubation for 48 hours. Therefore, when using CHROMagar Candida plate to detect specimens in AIDS patients, special attention must be paid to detect non-yeasts such as T. marneffei for up to 96 hours.


Subject(s)
Candida albicans/isolation & purification , Coinfection/diagnosis , Mycoses/diagnosis , Talaromyces/isolation & purification , AIDS-Related Opportunistic Infections/diagnosis , AIDS-Related Opportunistic Infections/microbiology , Agar , Candida albicans/growth & development , Coinfection/microbiology , Culture Media , Humans , Male , Middle Aged , Mouth/microbiology , Mycological Typing Techniques , Mycoses/microbiology , Oropharynx/microbiology , Talaromyces/growth & development , Time Factors
10.
Mol Plant ; 12(12): 1639-1650, 2019 12 02.
Article in English | MEDLINE | ID: mdl-31622682

ABSTRACT

Wheat stripe rust, due to infection by Puccinia striiformis f. sp. tritici (Pst), is a devastating disease that causes significant global grain yield losses. Yr36, which encodes Wheat Kinase START1 (WKS1), is an effective high-temperature adult-plant resistance gene and confers resistance to a broad spectrum of Pst races. We previously showed that WKS1 phosphorylates the thylakoid ascorbate peroxidase protein and reduces its ability to detoxify peroxides, which may contribute to the accumulation of reactive oxygen species (ROS). WKS1-mediated Pst resistance is accompanied by leaf chlorosis in Pst-infected regions, but the underlying mechanisms remain elusive. Here, we show that WKS1 interacts with and phosphorylates PsbO, an extrinsic member of photosystem II (PSII), to reduce photosynthesis, regulate leaf chlorosis, and confer Pst resistance. A point mutation in PsbO-A1 or reduction in its transcript levels by RNA interference resulted in chlorosis and reduced Pst sporulation. Biochemical analyses revealed that WKS1 phosphorylates PsbO at two conserved amino acids involved in physical interactions with PSII and reduces the binding affinity of PsbO with PSII. Presumably, phosphorylated PsbO proteins dissociate from the PSII complex and then undergo rapid degradation by cysteine and aspartic proteases. Taken together, these results demonstrate that perturbations of wheat PsbO by point mutation or phosphorylation by WKS1 reduce the rate of photosynthesis and delay the growth of Pst pathogen before the induction of ROS.


Subject(s)
Basidiomycota/physiology , Disease Resistance , Photosynthesis , Photosystem II Protein Complex/metabolism , Plant Diseases/immunology , Plant Proteins/metabolism , Triticum/microbiology , Chloroplasts/metabolism , Phosphorylation , Plant Diseases/microbiology , Triticum/cytology , Triticum/immunology , Triticum/metabolism
11.
Sci Rep ; 9(1): 9992, 2019 07 10.
Article in English | MEDLINE | ID: mdl-31292505

ABSTRACT

Light is a basic environmental factor required for plant growth and development; however, these are not only affected by light quantity, but also by light quality - light and radiation of different wavelengths and different compositions. In four different rice varieties (Oryza sativa L.), two kinds of shading materials, white cotton yarn (Shading (W)) and black nylon net (Shading (B)) were used to simulate cloudy days. Yield decreased under Shading (W) (15.3-17.7%) and Shading (B) (16.6-20.0%) compared to under sunny day (CK), and different effects on rice quality, which is mainly affected by changes in light quality, were observed. The change in light quality (Blue, Green, Red and R/FR proportions) represented under Shading (W) was significantly different from that under CK and Shading (B) conditions. Red light composition under Shading (W) was closer to that of the cloudy day condition. The proportion of blue light under Shading (W) was significantly lower than that under CK conditions; under Shading (B), it was higher than that under all conditions. The differences in light quality may affect photosynthesis in leaves and final starch synthesis, resulting in increased chalky grain rate, chalkiness, and poor rice quality. White cotton yarn as the shading material for further research used to simulate the influence of the light environment on rice growth under cloudy conditions will be better than black net.


Subject(s)
Agriculture/methods , Edible Grain/growth & development , Oryza/growth & development , Chlorophyll/metabolism , Edible Grain/metabolism , Oryza/metabolism , Photosynthesis , Seedlings/growth & development , Starch/metabolism , Sunlight
12.
J Cell Physiol ; 234(11): 21027-21038, 2019 11.
Article in English | MEDLINE | ID: mdl-31106420

ABSTRACT

Retinopathy has become one of the major factors that lead to blindness worldwide. Although many clinical therapies are concerned about such disease, most of them focus on symptoms alleviation. In this study, we aim to investigate whether coculture retinal stem cells (RSCs) with bone marrow mesenchymal stem cells transfected with angiogenin-1 (Ang-1-BMSCs) affects the damaged retinal tissue of oxygen-induced retinopathy of prematurity (OIR-ROP) mice. After OIR-ROP mouse model establishment, Ang-1-BMSCs, RSCs, and OIR-ROP retinal tissues were cocultured in a a transwell chamber. RSCs proliferation and the expression of Ang-1, insulin-like growth factor-1 (IGF-1) in the supernatant of RSCs, as well as ß-tubulin and protein kinase C (PKC) expression were evaluated. Finally, the repair of OIR-ROP mice retinal tissues was observed by injecting Ang-1-BMSCs + RSCs. In the OIR-ROP mouse model, RSCs cocultured with OIR-ROP retinal tissues could be induced to differentiate into cells expressing ß-tubulin and PKC and promote the expression of Ang-1 and IGF-1. coculture of Ang-1-BMSCs further enhanced the proliferation and differentiation of RSCs by promoting the expression of Ang-1 and IGF-1. Coculture of RSCs + Ang-1-BMSCs induced differentiation of Ang-1-BMSCs through interaction among intercellular factors and restored the damaged retinal tissue of OIR-ROP mice. Collectively, our study provided evidence that coculture of Ang-1-BMSCs and RSCs could promote the proliferation and differentiation of RSCs and improve the treatment for the damaged retina tissue of OIR-ROP mice.


Subject(s)
Mesenchymal Stem Cell Transplantation/methods , Mesenchymal Stem Cells/metabolism , Neural Stem Cells/metabolism , Retinopathy of Prematurity , Ribonuclease, Pancreatic/metabolism , Animals , Bone Marrow Cells/metabolism , Cell Differentiation/physiology , Cell Proliferation/physiology , Coculture Techniques , Mice , Neural Stem Cells/cytology , Retina/cytology , Retina/metabolism , Transfection
13.
Mycopathologia ; 184(3): 433-439, 2019 Jun.
Article in English | MEDLINE | ID: mdl-30976954

ABSTRACT

PURPOSE: To characterize the clinical and mycological features of favus of scrotum due to Trichophyton rubrum. METHODS: A single-site prospective study was carried out in an outpatient dermatology clinic. Microscopic examination and fungal culture were done using skin scrapings. Scales on the scrotum were stained with PAS and visualized by microscopy, including in vivo reflectance confocal microscopy (RCM). Two strains were analyzed by RAPD typing. Scutular lesions were fixed for scanning electron microscopy (SEM) and transmission electron microscopy (TEM). RESULTS: Cultures of the scale from the scrotum and/or groin in all patients showed a growth of T. rubrum. T. rubrum strains from scrotum and groins in one patient were demonstrated as the same strain by RAPD typing. The average age of patients was 34.1 ± 12.78 years. The mean course was 8.2 ± 5.07 days. All the patients received only topical treatment for 2 weeks without recurrence. Direct smear, calcofluor-white staining and in vivo RCM study of the scrotal favus in patients showed a massive number of septate branching hyphae, while fewer septate hyphae in scales in the groin. Abundant hyphae were found only in the outer layer of the stratum corneum of the scrotum under SEM and TEM with intact bilateral cell walls, and normal nucleus, liposomes and reticulum. Few distorted hyphae structures, cell wall degeneration, degenerated cytoplasm and the autophagy phenomenon could be seen in scales from groin under TEM. CONCLUSIONS: Scrotal favus due to T. rubrum is still a true infection, which most often occurred in immunocompetent patients.


Subject(s)
Scrotum/microbiology , Scrotum/pathology , Tinea Favosa/diagnosis , Tinea Favosa/pathology , Trichophyton/isolation & purification , Adolescent , Adult , Antifungal Agents/administration & dosage , Humans , Male , Microbiological Techniques , Microscopy, Confocal , Microscopy, Electron, Scanning , Microscopy, Electron, Transmission , Middle Aged , Molecular Diagnostic Techniques , Outpatients , Prospective Studies , Tinea Favosa/drug therapy , Tinea Favosa/microbiology , Young Adult
14.
Sci Rep ; 9(1): 313, 2019 01 22.
Article in English | MEDLINE | ID: mdl-30670728

ABSTRACT

Increase in grain nitrogen concentration (GNC), which is directly affected by nitrogen (N) application, can help overcome the issues of malnutrition. Here, the effects of urea type (polyaspartic acid (PASP) urea and conventional urea) and N management method (two splits and four splits) on GNC and N concentration of head rice were investigated in field experiments conducted in Sichuan, China, in 2014 and 2015. N concentration of grain and head rice were significantly (P < 0.05) increased by N redistribution from the leaf lamina, activities of glutamine synthetase (GS), and glutamate synthase (GOGAT) at the heading stage, and N concentration and GOGAT activity in the leaf lamina at the maturity stage. Compared to conventional urea, PASP-urea significantly improved N concentration of grain and head rice by improving the activities of GS and GOGAT, thereby increasing N distribution in the leaf lamina. The four splits method, unlike the two splits method, enhanced N concentration and activities of key N metabolism enzymes of leaf lamina, leading to increased GNC and N concentration in head rice too. Overall, four splits is a feasible method for using PASP-urea and improving GNC.


Subject(s)
Edible Grain/metabolism , Nitrogen/metabolism , Oryza/metabolism , China , Glutamate Synthase/metabolism , Glutamate-Ammonia Ligase/metabolism , Peptides/metabolism , Plant Leaves/enzymology , Plant Leaves/metabolism , Urea/metabolism
15.
Oncotarget ; 9(2): 2728-2738, 2018 Jan 05.
Article in English | MEDLINE | ID: mdl-29416806

ABSTRACT

OBJECTIVE: Glucose transporter-1 (GLUT-1) as the major glucose transporter present in human cells is found overexpressed in a proportion of human malignancies. This meta-analysis is attempted to assess the prognostic significance of GLUT-1 for survival in various cancers. MATERIALS AND METHODS: We conducted an electronic search using the databases PubMed, Embase and Web of Science, from inception to Oct 20th, 2016. Pooled hazard ratios (HRs) and 95% confidence intervals (CIs) were calculated. RESULTS: Fourty-one studies with a total of 4794 patients were included. High GLUT-1 expression was significantly associated with poorer prognosis [overall survival: HR = 1.833 (95% CI: 1.597-2.069, P < 0.0001); disease-free survival: HR = 1.838 (95% CI: 1.264-2.673, P < 0.0001); progression-free survival: HR = 2.451 (95% CI: 1.668-3.233, P < 0.0001); disease specific survival: HR = 1.96 (95% CI: 1.05-2.871, P < 0.0001)]. CONCLUSIONS: High GLUT-1 expression may be an independent prognostic marker to predict poor survival in various types of cancers. Further clinical trials with high quality need to be conducted to confirm our conclusion.

16.
BMC Biotechnol ; 17(1): 69, 2017 09 02.
Article in English | MEDLINE | ID: mdl-28865427

ABSTRACT

BACKGROUND: Membrane proteins define biological functions of membranes in cells. Extracellular peptides of transmembrane proteins receive signals from pathogens or environments, and are the major targets of drug developments. Despite of their essential roles, membrane proteins remain elusive in topological studies due to technique difficulties in their expressions and purifications. METHODS: First, the target gene is cloned into a destination vector to fuse with C terminal ubiquitin at the N or C terminus. Then, Cub vector with target gene and NubWT or NubG vectors are transformed into AP4 or AP5 yeast cells, respectively. After mating, the diploid cells are dipped onto selection medium to check the growth. Topology of the target protein is determined according to Table 1. RESULTS: We present a split ubiquitin topology (SUT) analysis system to study the topology and truncation peptide of membrane proteins in a simple yeast experiment. In the SUT system, transcription activator (TA) fused with a nucleo-cytoplasmic protein shows strong auto-activation with both positive and negative control vectors. TA fused with the cytoplasmic end of membrane proteins activates reporter genes only with positive control vector with a wild type N terminal ubiquitin (NubWT). However, TA fused with the extracellular termini of membrane proteins can't activate reporter genes even with NubWT. Interestingly,TA fused with the released peptide of a membrane protein shows autoactivation in the SUT system. CONCLUSION: The SUT system is a simple and fast experimental procedure complementary to computational predictions and large scale proteomic techniques. The preliminary data from SUT are valuable for pathogen recognitions and new drug developments.


Subject(s)
Membrane Proteins/metabolism , Proteomics/methods , Ubiquitin/metabolism , Genetic Vectors , Green Fluorescent Proteins/genetics , Green Fluorescent Proteins/metabolism , Membrane Proteins/genetics , Nucleocytoplasmic Transport Proteins/genetics , Nucleocytoplasmic Transport Proteins/metabolism , Peptides/metabolism , Protein Splicing , Recombinant Proteins/genetics , Recombinant Proteins/metabolism , Saccharomyces cerevisiae/genetics , Saccharomyces cerevisiae/metabolism , Ubiquitin/genetics
17.
Int J Biol Macromol ; 95: 696-703, 2017 Feb.
Article in English | MEDLINE | ID: mdl-27919813

ABSTRACT

Dextransucrase (EC2.4.5.1) from strain Leuconostoc mesenteroides 0326, which synthesizes dextran and oligosaccharides, which act as prebiotics, are popularly used in such industries as food and medicine. A novel dextransucrase efficient in synthesizing oligosaccharides was designed. We constructed the truncation mutant DSR-S1-ΔA (residues 1-3087bp) by deleting the 1494bp fragment of the C-terminal. The novel enzyme (MW: 110kDa) loss activity, when sucrose was used as only substrate. After adding an acceptor, DSR-S1-ΔA was fully activated but with heavily impaired polysaccharide synthesis ability. Instead, the enzyme produced a large amount of oligosaccharides. DSR-S1-ΔA showed transglycosylation for synthesizing more oligosaccharides of lower degree of polymerization (DP) with different acceptors, and it also improved the selection range of dextransucrase acceptor response to acceptors. The enzyme developed in this study can be applied in glycodiversifcation studies.


Subject(s)
Glucosyltransferases/genetics , Glucosyltransferases/metabolism , Oligosaccharides/chemical synthesis , Protein Engineering , Chemistry Techniques, Synthetic , Dose-Response Relationship, Drug , Escherichia coli/genetics , Glycosylation , Leuconostoc/enzymology , Leuconostoc/genetics , Maltose/pharmacology , Sucrose/pharmacology
18.
Chemosphere ; 159: 342-350, 2016 Sep.
Article in English | MEDLINE | ID: mdl-27317940

ABSTRACT

Polysaccharide-modified flocculant is a notable material in the field of wastewater treatment. Synthesis of biopolysaccharide derivatives as eco-friendly flocculants is remarkably desired for environmental protection. This work presents an efficient flocculant synthesized through copolymerization of acrylamide, sodium acrylate (AS), and dextran. Physicochemical properties of the flocculant were evaluated. Process parameters of coal-washing wastewater flocculation were tested using Response Surface Method. The application of graft polymers exhibited efficient flocculation performance at low level of flocculant dosage in alkalescent environment. The improved dextran contributes to handle industrial effluent and sanitary sewage.


Subject(s)
Dextrans/chemistry , Polymers/chemical synthesis , Water Purification/instrumentation , Flocculation , Polymerization , Polymers/chemistry , Wastewater/chemistry
19.
Zhongguo Zhong Xi Yi Jie He Za Zhi ; 36(2): 160-5, 2016 Feb.
Article in Chinese | MEDLINE | ID: mdl-27078990

ABSTRACT

OBJECTIVE: To evaluate the clinical efficacy of Jianpi Liqi Yiliu Formula (JLYF) combined with cytokine-induced killer (CIK) cells for treating patients with advanced hepatocellular carcinoma (HCC). METHODS: Between January 2011 and January 2014, 60 advanced HCC patients were enrolled in this study, who were assigned to the treatment group and the control group according to their willingness for taking JLYF, 30 cases in each group. All patients received CIK cell treatment: 1 x 109-3 x 109 each time, by intravenous dripping from the 1st day to the 3rd day, once per day. Besides, patients in the treatment group took JLYF decoction, while those in the control group took Chinese medical decoction by syndrome typing. All patients received treatment of at least two cycles. The time to progression (TTP) , overall survival (OS), disease control rate (DCR), performance status scale (PS), Child-Pugh scale, and adverse reactions were observed, and subgroup analyzed. RESULTS: To May 31, 2014, all patients reached the clinical endpoint. TTP was 3.5 months (95% Cl: 3.30-4.10) in the treatment group, better than that (2.5 months, 95% CI: 2.32-2.68) of the control group (P < 0.05). DCR was 36.7% in the treatment group and 30.0% in the control group (P > 0.05). OS was 5.2 months (95% CI: 4.53-5.87) in the treatment group and 4.6 months (95% CI: 4.06-5.14) in the control group (P > 0.05). The PS scale was 1.60 ± 0.10 after treatment, lower than that (1.80 ± 0.09) before treatment in the treatment group (P < 0.05). When the PS scale was 0-2 or Child-Pugh scale was class A, TTP was longer in the treatment group than in the control group (P < 0.05). No adverse reaction occurred in the two groups during the treatment course. CONCLUSIONS: The combination of JLYF with ClK cell treatment could prolong advanced HCC patients' TTP, improve PS scale, as compared with syndrome typed Chinese medical decoction treatment group. Besides, when the PS scale was 0-2 or Child-Pugh scale was class A, it was a better treatment program for advanced HCC patients.


Subject(s)
Carcinoma, Hepatocellular/therapy , Cytokine-Induced Killer Cells/cytology , Drugs, Chinese Herbal/therapeutic use , Liver Neoplasms/therapy , Cell- and Tissue-Based Therapy , Disease Progression , Humans
20.
Chin Med J (Engl) ; 128(20): 2743-50, 2015 Oct 20.
Article in English | MEDLINE | ID: mdl-26481740

ABSTRACT

BACKGROUND: With the progress of perinatal medicine and neonatal technology, more and more extremely low birth weight (ELBW) survived all over the world. This study was designed to investigate the short-term outcomes of ELBW infants during their Neonatal Intensive Care Unit (NICU) stay in the mainland of China. METHODS: All infants admitted to 26 NICUs with a birth weight (BW) < l000 g were included between January l, 2011 and December 31, 2011. All the data were collected retrospectively from clinical records by a prospectively designed questionnaire. The data collected from each NICU transmitted to the main institution where the results were aggregated and analyzed. Categorical variables were performed with Pearson Chi-square test. Binary Logistic regression analysis was used to detect risk factors. RESULTS: A total of 258 ELBW infants were admitted to 26 NICUs, of whom the mean gestational age (GA) was 28.1 ± 2.2 weeks, and the mean BW was 868 ± 97 g. The overall survival rate at discharge was 50.0%. Despite aggressive treatment 60 infants (23.3%) died and another 69 infants (26.7%) died after medical care withdrawal. Furthermore, the survival rate was significantly higher in coastal areas than inland areas (53.6% vs. 35.3%, P = 0.019). BW < 750 g and GA < 28 weeks were the largest risk factors, and being small for gestational age was a protective factor related to mortality. Respiratory distress syndrome was the most common complication. The incidence of patent ductus arteriosus, intraventricular hemorrhage, periventricular leukomalacia, bronchopulmonary dysplasia, retinopathy of prematurity was 26.2%, 33.7%, 6.7%, 48.1%, and 41.4%, respectively. Ventilator associated pneumonia was the most common hospital acquired infection during hospitalization. CONCLUSIONS: Our study was the first survey that revealed the present status of ELBW infants in the mainland of China. The mortality and morbidity of ELBW infants remained high as compared to other developed countries.


Subject(s)
Infant, Extremely Low Birth Weight , China , Female , Humans , Infant , Infant Mortality , Infant, Newborn , Intensive Care Units, Neonatal/statistics & numerical data , Male , Morbidity , Respiratory Distress Syndrome, Newborn/mortality , Retrospective Studies , Surveys and Questionnaires
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