SARS-CoV-2 prevalence in wildlife 2020-2022: a worldwide systematic review and meta-analysis.

The widespread transmission of SARS-CoV-2 in humans poses a serious threat to public health security, and a growing number of studies have discovered that SARS-CoV-2 infection in wildlife and mutate over time. This article mainly reports the first systematic review and meta-analysis of the prevalence of SARS-CoV-2 in wildlife. The pooled prevalence of the 29 included articles was calculated by us using a random effects model (22.9%) with a high heterogeneity (I2 = 98.7%, p = 0.00). Subgroup analysis and univariate regression analysis found potential risk factors contributing to heterogeneity were country, wildlife species, sample type, longitude, and precipitation. In addition, the prevalence of SARS-CoV-2 in wildlife increased gradually over time. Consequently, it is necessary to comprehensively analyze the risk factors of SARS-CoV-2 infection in wildlife and develop effective control policies, as well as to monitor the mutation of SARS-CoV-2 in wildlife at all times to reduce the risk of SARS-CoV-2 transmission among different species.

[Titin: structure, isoforms and functional regulation].

Titin, the largest known protein in the body expressed in three isoforms (N2A, N2BA and N2B), is essential for muscle structure, force generation, conduction and regulation. Since the 1950s, muscle contraction mechanisms have been explained by the sliding filament theory involving thin and thick muscle filaments, while the contribution of cytoskeleton in force generation and conduction was ignored. With the discovery of insoluble protein residues and large molecular weight proteins in muscle fibers, the third myofilament, titin, has been identified and attracted a lot of interests. The development of single molecule mechanics and gene sequencing technology further contributed to the extensive studies on the arrangement, structure, elastic properties and components of titin in sarcomere. Therefore, this paper reviews the structure, isforms classification, elastic function and regulatory factors of titin, to provide better understanding of titin.

Reirradiation with stereotactic body radiotherapy for primary or secondary lung malignancies: Tumor control probability and safety analyses.

BACKGROUND: Reirradiation with stereotactic body radiotherapy (SBRT) for patients with primary or secondary lung malignancies represents an appealing definitive approach, but its feasibility and safety are not well defined. The purpose of this study was to investigate the tumor control probability (TCP) and toxicity for patients receiving reirradiation with SBRT. PATIENTS AND METHODS: Eligible patients with recurrence of primary or secondary lung malignancies from our hospital were subjected to reirradiation with SBRT, and PubMed- and Embase-indexed articles were reviewed. The patient characteristics, pertinent SBRT dosimetric details, local tumor control, and toxicities were extracted. The logistic dose-response models were compared for TCP and overall survival (OS) in terms of the physical dose and three-, four-, and five-fraction equivalent doses. RESULTS: The data of 17 patients from our hospital and 195 patients extracted from 12 articles were summarized. Reirradiation with SBRT yielded 2-year estimates of 80% TCP for doses of 50.10 Gy, 55.85 Gy, and 60.54 Gy in three, four, and five fractions, respectively. The estimated TCP with common fractionation schemes were 50%, 60%, and 70% for 42.04 Gy, 47.44 Gy, and 53.32 Gy in five fractions, respectively. Similarly, the 2-year estimated OS was 50%, 60%, and 70% for 41.62 Gy, 46.88 Gy, and 52.55 Gy in five fractions, respectively. Central tumor localization may be associated with severe toxicity. CONCLUSIONS: Reirradiation with SBRT doses of 50-60 Gy in 3-5 fractions is feasible for appropriately selected patients with recurrence of peripheral primary or secondary lung malignancies, but should be carefully considered for centrally-located tumors due to potentially severe toxicity. Further studies are warranted for optimal dose/fractionation schedules and more accurate selection of patients suitable for reirradiation with SBRT.

In vitro corrosion resistance and dual antibacterial ability of curcumin loaded composite coatings on AZ31 alloy: Effect of amorphous calcium carbonate.

Rapid corrosion and bacterial infection are obstacles to put into use biodegradable magnesium (Mg) alloy as biomedical materials. In this research, an amorphous calcium carbonate (ACC)@curcumin (Cur) loaded poly-methyltrimethoxysilane (PMTMS) coating prepared by self-assembly method on micro-arc oxidation (MAO) coated Mg alloy has been proposed. Scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy are adopted to analyze the morphology and composition of the obtained coatings. The corrosion behaviour of the coatings is estimated by hydrogen evolution and electrochemical tests. The spread plate method without or with 808 nm near-infrared irradiation is applied to evaluate the antimicrobial and photothermal antimicrobial ability of the coatings. Cytotoxicity of the samples is tested by 3-(4,5)-dimethylthiahiazo(-z-y1)-2,5-di- phenytetrazoliumromide (MTT) and live/dead assay culturing with MC3T3-E1 cells. Results show that the MAO/ACC@Cur-PMTMS coating exhibited favourable corrosion resistance, dual antibacterial ability, and good biocompatibility. Cur was employed as an antibacterial agent and photosensitizer for photothermal therapy. The core of ACC significantly improved the loading of Cur and the deposition of hydroxyapatite corrosion products during degradation, which greatly promoted the long-term corrosion resistance and antibacterial activity of Mg alloys as biomedical materials.

The global prevalence of highly pathogenic avian influenza A (H5N8) infection in birds: A systematic review and meta-analysis.

The zoonotic pathogen avian influenza A H5N8 causes enormous economic losses in the poultry industry and poses a serious threat to the public health. Here, we report the first systematic review and meta-analysis of the worldwide prevalence of birds. We filtered 45 eligible articles from seven databases. A random-effects model was used to analyze the prevalence of H5N8 in birds. The pooled prevalence of H5N8 in birds was 1.6%. In the regions, Africa has the highest prevalence (8.0%). Based on the source, village (8.3%) was the highest. In the sample type, the highest prevalence was organs (79.7%). In seasons, the highest prevalence was autumn (28.1%). The largest prevalence in the sampling time was during 2019 or later (7.0%). Furthermore, geographical factors also were associated with the prevalence. Therefore, we recommend site-specific prevention and control tools for this strain in birds and enhance the surveillance to reduce the spread of H5N8.

The predictive value of preoperative fibrinogen level in peripheral blood combined with platelet-to-lymphocyte ratio in the prognosis of colorectal cancer / 医学研究生学报

ObjectiveThe local recurrence or distant metastasis of colorectal cancer (CRC) after surgical resection still directly affects the prognosis of CRC patients.This study aims to investigate the clinical significance of preoperative peripheral blood fibrinogen (Fbg) level combined with platelet-to-lymphocyte ratio (PLR) in the prognosis of CRC.MethodsThe clinicopathological characteristics of 108 CRC patients who were diagnosed by pathology and underwent surgical resection in Wujin hospital affiliated to Jiangsu University from January 2013 to December 2015 were analyzed. Fbg and PLR thresholds were determined by ROC curve, and the patients were grouped according to Fbg combined with PLR (F-PLR) to analyze the relationship between different F-PLR scores and the clinicopathological characteristics and prognosis of CRC patients.ResultsPLR showed statistically significant difference in the left and right half of the tumor (P0.05). Multivariate analysis using COX regression showed that F-PLR score, TNM stage and lymph node metastasis were independent risk factors for the prognosis of CRC patients (P<0.05).ConclusionThe F-PLR score (Fbg and PLR combined) can be used as a predictor of treatment effect and prognosis of CRC patients to guide clinical treatment decisions and prognoses.

Clinical Significance of Expression of CDKN1C in Bone Marrow in Patients with Myelodysplastic Syndrome and Secondary Acute Myeloid Leukemia / 现代检验医学杂志

Objective To investigate the expression of CDKN1C in bone marrow in myelodysplastic syndromes and clinical significance of the detection of syndrome and secondary acute myeloid leukemia patients.Methods 125 patients with MDS/ AML were selected as the research object,and selected 20 cases of healthy people as healthy control group,and to investigate the mRNA and protein expression in CD34+ cells in bone marrow the expression of MDS/AML in patients and the survival rate of different expression of CDKN1C,to analyze the factors for survival rate of patients with MDS by Cox regression,and analyze the different treatment methods in patients with MDS/AML.Results The expression lcvcls of CDKN1C mRNA and protein of bone marrow CD34 + cells in the patients with MDS/AML were significantly higher than the healthy control group (t=5.324,7.326;P=0.002,0.000),and which was positive with BM count (r=2.014,P=0.004);the survival rate of CDKN1C high expression levels in patients with MDS/AML was significantly lower than that of the low expression of CDKN1C group and intermediate CDKN1C expression group (P＜0.05).Cox regression analysis showed that age,high BM count,cytogenetic risk difference and CDKN1C positive significantly affect the survival rate of patients with MDS/AML (95％CI=1.10～1.32,1.92～4.40,1.18～2.67,1.03～2.32,P=0.034～0.000).MDS/AML chemotherapy in CDKN1C positive group was significantly lower than the survival rate of patients with CDKN1C negative expression group (t=5.314,P=0.002).Conclusion The expression of CDKN1C in bone marrow of patients with MDS/AML was significantly increased,and the high expression of CDKN1CMDS/AML effect of chemotherapy on the survival rate of patients with MDS/AML.

Effect of isoflurane delayed preconditioning on myocardial ischemia reperfusion injury in rabbits / 中南大学学报(医学版)

OBJECTIVE@#To investigate the protective effect of isoflurane delayed preconditioning on myocardial ischemia reperfusion injury and the potential mechanism in rabbits.@*METHODS@#Thirty New Zealand male white rabbits were randomly assigned to 3 groups: Control group; I/R group; and 2.0% isoflurane group. Isoflurane group was exposed to 2.0% isoflurane-100% oxygen for 2 hours. Control group and I/R group were exposed to 100% oxygen for 2 hours and served as untreated controls. Twenty-four hours later I/R group and isoflurane group underwent 40 minutes of coronary occlusion followed by 2 hours of reperfusion. Blood samples were taken from the arterial line at 20 minutes before the occlusion(T1), 20 minutes after the occlusion(T2), 40 minutes after the occlusion(T3), 1 hours after the reperfusion(T4), and 2 hours after the reperfusion(T5) to determine the plasma level of TNF-alpha. At the end of the reperfusion, infarct size and area at risk were defined by Evans and TTC staining. The heart was harvested and levels of the p38MAPK activity were determined by Western blot, and ultrastructures were observed under the electron microscope.@*RESULTS@#The p38MAPK activity of isoflurane group was significantly lower than that of I/R group (P<0.05). Isoflurane significantly (P<0.05) reduced the infarct size(19.7%+/-2.8% in isoflurane group) of the left ventricular area at risk as compared with the controls (37.8%+/-1.7% in I/R group).The injury of I/R group was worse than that of isoflurane group under the light microscope. Isoflurane group had a lower level of TNF-alpha than I/R group.@*CONCLUSION@#Isoflurane can inhibit p38MAPK activity during myocardial ischemia reperfusion and modulate the cytokine expression, which may be one of the molecular mechanisms of isoflurane delayed preconditioning on cardioprotection.

Effect of ulinastain on the expression of hemeoxygenase-1 in oleic acid-induced acute lung injury in rats / 中南大学学报(医学版)

OBJECTIVE@#To explore the effect of ulinastain on the expression of hemeoxy genase-1 (HO-1) in oil acid-induced acute lung injury in rats.@*METHODS@#The animal model of acute lung injury was established by oil acid. Thirty SD rats were randomly divided into 3 groups: the blank control group (A), the acute lung injury group (B) and the acute lung injury group (C) followed by injecting 100 mL/kg ulinastatin. Each group consisted of 10 rats. Group A were given 0.2 mL/kg natural solution through the trial vein; Group B and C were given 0.2 mL/kg oil-acid through trial vein, while group C were injected 100mL/kg ulinastatin by the peritoneal cavity after injecting oil acid. After 4 hours, the rates of respiration were counted and blood samples were cramped out through the heart puncture for blood gas analysis. The expressions of hemeoxygenase-1 and the pathologic construction changes were determined by HE staining in the lower right lung of rats in the 3 groups.@*RESULTS@#The respiration dysfunction caused by oil acid could be prominently improved by ulinastain. There was only a little expression of hemeoxygenase-1 in the lung of Group A, but the expression increased in Group B and significatively increased in Group C.@*CONCLUSION@#Ulinastatin may protect the rats from acute lung injury through increasing the expression of HO-1.