OBJECTIVES: To explore the effects of hypoxic and hypobaric conditions on blood gas and erythrocyte-related indicators in rats. METHODS: SD male rats were exposed to low-pressure hypoxic conditions simulating an altitude of 6500 m in a small or a large experimental cabin. Abdominal aortic blood samples were collected and blood gas indicators, red blood cells (RBCs) count, and hemoglobin (Hb) content were measured. The effects of exposure to different hypoxia times, different hypoxia modes, normal oxygen recovery after hypoxia, and re-hypoxia after hypoxia preconditioning on blood gas indicators, RBCs count and Hb content were investigated. RESULTS: The effect of blood gas indicators was correlated with the length of exposure time of hypoxia and the reoxygenation after leaving the cabin. Hypoxia caused acid-base imbalance and its severity was associated with the duration of hypoxia; hypoxia also led to an increase in RBCs count and Hb content, and the increase was also related to the time exposed to hypoxia. The effects of reoxygenation on acid-base imbalance in rats caged in a small animal cabin were more severe that those in a large experimental cabin. Acetazolamide alleviated the effects of reoxygenation after leaving the cabin. Different hypoxia modes and administration of acetazolamide had little effect on RBCs count and Hb content. Normal oxygen recovery can alleviate the reoxygenation and acid-base imbalance of hypoxic rats after leaving the cabin and improve the increase in red blood cell and hemoglobin content caused by hypoxia. The improvement of hypoxia preconditioning on post hypoxia reoxygenation is not significant, but it can alleviate the acid-base imbalance caused by hypoxia in rats and to some extent improve the increase in red blood cell and hemoglobin content caused by hypoxia. CONCLUSIONS Due to excessive ventilation and elevated RBCs count and Hb content after hypoxia reoxygenation, oxygen partial pressure and other oxygenation indicators in hypoxic rats are prone to become abnormal, while blood gas acid-base balance indicators are relatively stable, which are more suitable for evaluating the degree of hypoxia injury and related pharmacological effects in rats.
Rats ; Animals ; Male ; Acetazolamide ; Hypoxia ; Oxygen ; Erythrocytes ; Hemoglobins ; Acid-Base Imbalance

Severe muscle injury is hard to heal and always results in a poor prognosis. Recent studies found that extracellular vesicle-based therapy has promising prospects for regeneration medicine, however, whether extracellular vesicles have therapeutic effects on severe muscle injury is still unknown. Herein, we extracted apoptotic extracellular vesicles derived from mesenchymal stem cells (MSCs-ApoEVs) to treat cardiotoxin induced tibialis anterior (TA) injury and found that MSCs-ApoEVs promoted muscles regeneration and increased the proportion of multinucleated cells. Besides that, we also found that apoptosis was synchronized during myoblasts fusion and MSCs-ApoEVs promoted the apoptosis ratio as well as the fusion index of myoblasts. Furthermore, we revealed that MSCs-ApoEVs increased the relative level of creatine during myoblasts fusion, which was released via activated Pannexin 1 channel. Moreover, we also found that activated Pannexin 1 channel was highly expressed on the membrane of myoblasts-derived ApoEVs (Myo-ApoEVs) instead of apoptotic myoblasts, and creatine was the pivotal metabolite involved in myoblasts fusion. Collectively, our findings firstly revealed that MSCs-ApoEVs can promote muscle regeneration and elucidated that the new function of ApoEVs as passing inter-cell messages through releasing metabolites from activated Pannexin 1 channel, which will provide new evidence for extracellular vesicles-based therapy as well as improving the understanding of new functions of extracellular vesicles.
Creatine/metabolism* ; Extracellular Vesicles ; Muscle, Skeletal/metabolism* ; Myoblasts/metabolism* ; Regeneration ; Connexins/metabolism*

Objective:To explore the application effect of quantitative evaluation nursing in Operating Room in patients undergoing radical resection of rectal cancer.Methods:A total of 114 patients who received radical resection of rectal cancer in Xi'an Daxing Hospital from December 2019 to December 2021 were selected by the convenient sampling method. According to the order of admission, they were divided into the observation group and the conventional group, with 57 cases in each group. The observation group received quantitative evaluation nursing in the Operating Room, while the conventional group received routine Operating Room nursing. The differences in physiological indexes and mood state scores were compared between the two groups.Results:The postoperative diastolic blood pressure, systolic blood pressure and heart rate in the observation group were lower than those in the conventional group ( P<0.05). The scores of depression-frustration, tension-anxiety, fatigue-dullness, anger-hostility and confusion-chaos dimensions of postoperative mood state in the observation group were lower than those in the conventional group, and the energy-vitality score was higher than that in the conventional group ( P<0.05) . Conclusions:Quantitative evaluation nursing in the Operating Room can reduce the psychosomatic stress response in patients undergoing radical resection of rectal cancer.

Objective: To propose the concept of a novel regional control and prevention (RCP) system for the outbreak of COVID-19 infectious disease, design an emergency epidemic prevention information system based on the existing network architecture and information system in the region, and a remote intelligent medical consultation and remote office platform, research and develop the technology of risk assessment and early warning for people in the region, and improve the regions’prevention and control ability facing emergency of major infectious diseases. Methods: Taking colleges, affiliated (teaching) hospitals, and cloud applications as typical RCP regional units, the existing local area network interaction methods between the cloud and universities and affiliated (teaching) hospitals are established to realize remote work in the network environment, remote medical imaging, psychological and ethical consultation and interaction; applying multi-agent propagation model based on complex network, combining Global Positioning System (GPS), Radio Frequency Identification (RFID), and electronic fence technology, to realize the risk classification and early warning of units and personnel in the area. Results: In the RCP, a system architecture combining campus network, affiliated (teaching) hospital intranet, and the Internet is used. Dynamic connection is made using distributed technology and cloud storage. The data buffer mechanism of the intermediary database in the network realized telemedicine consultation and telecommuting. Relying on the platform, multi-agent propagation model based on complex network and cellular automaton model are used to realize the score and early warning of population exposure risk in the region by using GPS, RFID and electronic fence technology. Conclusions In the epidemic phase of major infectious diseases, the construction of RCP can improve the response speed of wartime epidemic prevention, provide reasonable data-based warnings and risk ratings, and reduce the exposure risk of susceptible people. The design and development of RCP is a systematic project that needs to combine regional structural and functional characteristics, and the foundation of the early informatization work in the region and the level of the emergency development team determine the development progress, maintenance, and actual application effects. It is recommended to establish a peacetime and wartime combined RCP mode and incorporate it into the government's disease control system to improve the national and regional level of prevention and control of major infectious diseases.

Objective:To report a case with frontotemporal dementia (FTD) characterized by involuntary laughter.Methods:The clinical manifestations and imaging characteristics of a patient diagnosed as FTD was analyzed. Then the results of cerebrospinal fluid, positron emission tomography-computed tomography (PET-CT) and single-photon emission computed tomography examinations were collected. Blood samples were tested for related genes of FTD.Results:The patient is a 66 years old woman with insidious onset and progressing symptoms and she was mainly manifested as laughing out loud involuntarily when looking at others, childishness, stubbornness, loss of interest, irritability and other personal changes. Mild motor and language disorders were also manifested as moving slowly and speaking unclearly. The magnetic resonance imaging showed the atrophy of bilateral frontal, temporal lobe and bilateral hippocampal while the image of PET-CT showed the metabolism was reduced in different degrees. Eventually, behavioural variant of FTD was diagnosed. The result of ANXA11 gene sequencing revealed the mutation of c.107C>G(p.P36R).Conclusions:This is the first case in which a heterozygous mutation of ANXA11 gene, which is related to amyotrophic lateral sclerosis (ALS), is found in simple FTD patient, suggesting that ANXA11 gene may play an important role in the pathogenesis of FTD. This further supports the theory that ALS and FTD are spectrum disorders.

With the rapid outbreak of COVID-19, traditional Chinese medicine(TCM) has been playing an active role against the epidemic. However, the screening of TCM is limited by the development cycle and laboratory conditions, which greatly limits the screening speed. This study established optimization docking models and virtual screening to discovery potential active herbs for the prevention and treatment of the novel coronavirus based on molecular docking technology. The crystal structures of 3 CL protease(Mpro) and papain-like protease(PLP) were obtained from PDB database and homologous modeling respectively, and were used to conduct virtual screening of TCMD 2009 database by CDOCKER program. The ingredients scored in the top 100 were selected respectively, and the candidate herbs were ranked by the numbers of hit molecules. Based on Mpro inhibitors screening, 12 322 potential active components were obtained, and the representative active components included aster pentapeptide A, ligustrazine, salvianolic acid B, etc., and Zingiberis Rhizoma Recens, Asteris Radix et Rhizoma, Notoginseng Radix et Rhizoma, Chuanxiong Rhizoma, Salviae Miltiorrhizae Radix et Rhizoma, Zingiberis Rhizoma, Dianthi Herba, Rhei Radix et Rhizoma, Cistanches Herba were obtained. While 11 294 potential active ingredients were obtained by PLP inhibitor screening, representative active ingredients included gingerketophenol, ginkgol alcohol, ferulic acid, etc., and Codonopsis Radix, Notopterygii Rhizoma et Radix, Zingiberis Rhizoma Recens, Ginkgo Semen, Chuanxiong Rhizoma, Trichosanthis Fructus, Paeoniae Radix Alba, Psoraleae Fructus, Sophorae Flavescentis Radix, Notoginseng Radix et Rhizoma, Angelicae Sinensis Radix were chosen. By combining the diagnosis and treatment scheme of Hunan province's and angiotensin converting enzyme 2(ACE2) inhibitors screening from literature, present study also discussed the rational application of candidate herbs to this epidemic situation. Trichosanthis Fructus obtained by PLP inhibitors screening and Fritillaria verticillata obtained by ACE2 inhibitors screening were parts of the Sangbei Zhisou Powder and Xiaoxianxiong Decoction, which might be applicable to the syndromes of cough and dyspnea. Rhei Radix et Rhizoma screened by Mpro and Trichosanthis Fructus screened by PLP were contained in Maxing Shigan Decoction and Xuanbai Chengqi Decoction, and could be applied to the syndromes of epidemic virus blocking lung. Mori Folium, Lonicerae Japonicae Flos and Forsythiae Fructus obtained by ACE2 inhibitors screening were included in the Sangju Decoction and Yinqiaosan, which might be applicable to the syndromes of warm pathogen attacking lung and cough and dyspnea. The results of this study are intended to provide a reference for the further development of traditional Chinese medicine to deal with the new epidemic.
Angiotensin-Converting Enzyme 2 ; Angiotensin-Converting Enzyme Inhibitors/pharmacology* ; Betacoronavirus/drug effects* ; COVID-19 ; Coronavirus Infections/drug therapy* ; Drug Evaluation, Preclinical ; Drugs, Chinese Herbal/pharmacology* ; Humans ; Medicine, Chinese Traditional ; Molecular Docking Simulation ; Pandemics ; Peptidyl-Dipeptidase A ; Pneumonia, Viral/drug therapy* ; SARS-CoV-2 ; COVID-19 Drug Treatment

Objective: To establish a quantitative assay of serum Golgi protein 73 (GP73) using xMAP technology and evaluate its performance. Methods: Monoclonal antibodies against GP73 were prepared and purified, and antibody pair screening was performed by double-antibody sandwich enzyme-linked immunosorbent assay. The screened antibodies were used to construct a Luminex liquid chip detection system, and the analysis performance of the detection system was evaluated. The serum levels of GP73 were detected in 90 clinical samples from healthy controls and patients with chronic hepatitis B infection (CHB) and hepatocellular carcinoma (HCC). Results: Five anti-GP73 monoclonal antibodies were prepared and purified, and 5 antibody pairs were successfully screened. The Luminex liquid chip detection system of GP73 was successfully constructed using 8F10D1 and 10B9F11 antibody pairs. The analytical performance evaluation showed that the sensitivity of this system was 0.25 ng/ml and the dynamic range was 0.25-100 ng/ml. No cross reactivity was observed. The intra- and inter-assay variation for GP73 was <8% and <11%, respectively. The recovery was 83%-92%. The linear regression equation was y=1.141x+ 6.436 (r²=0.998 4, P<0.001). The GP73 concentrations in the serum samples of healthy control, CHB group, and HCC group were 42.8 (38.68, 55.90) ng/ml, 61.49 (43.59, 81) ng/ml, and 122.78 (49.36 liter, 264.55) ng/ml, respectively. The levels of GP73 in HCC group were significantly higher than those in CHB group and healthy controls (P<0.05). Moreover, the levels of GP73 in CHB group were significantly higher than those in healthy controls (P<0.05). Conclusions A liquid chip detection system of GP73 was successfully constructed. It provides a powerful tool for the clinical application of GP73 in the future.

OBJECTIVETo compare the expression of DKKL1 in ejaculated spermatozoa of normal fertile men and men with asthenospermia and investigate the role of DKKL1 in the pathogenesis of asthenospermia.

METHODSThe characteristics of semen samples collected from normal fertile men and men with asthenospermia were analyzed using computer-assisted sperm analysis according to WHO criteria. The ejaculated sperms were isolated by Percoll discontinuous density gradients to detect the expression of DKKL1 mRNA and protein using real-time PCR and Western blotting.

RESULTSThe expression of DKKL1 mRNA was significantly down-regulated by 11.1 times in asthenospermic men as compared with that in normal fertile men (P<0.01). Western blotting showed that the expression of DKKL1 protein was down-regulated by 2.4 times in asthenospermic men compared to normal fertile men.

CONCLUSIONThe expression of DKKL1, which may play an important role in sperm motility,is significantly decreased in ejaculated spermatozoa of men with asthenospermia.

Objective To compare the standards for recruitment of cadet pilots between PLA Air Force and the US Air Force,so as to offer reference for revising PLAAF medical standards for recruiting cadet pilots.Methods Literature from medical bibliographic databases and foreign military official websites was retrieved, four published reports and network information were cited and PLAAF medical standards were compared with those in China.Results The American medical standards include Department of Defense Instruction, Air Force Medical Examination and Standards, Air Force Medical Standards Directory, and Air Force Waiver Guide,which are independent and aimed directly at different examinations so that medical requirements have been gradually broadened.Compared to our standards, the American medical selection is more dependent on clinic consultations, and more detailed in specifications of diseases, more focused on body functions than on body shape, and the psychological screening is more subtle.Conclusion The standards adopted by US Air Force are more evidence-based.We are to rectify our medical standards accordingly, which should be efficacious, safe and effective for improving the overall quality of our military pilots.

Objective To analyze the spectrum of anus disease during the medical selection of flying cadets and com-pare the medical standard between US Air Force and Chinese Air Force in order to improve the system of medical selection. Methods The data on flying cadets of Chinese Air Force medical selection from 2012 to 2015 were retrospectively analyzed and these data were re-analyzed by medical standards for US Air Force flying cadets.Results Ninety students were elimi-nated because of anal disease,including 65 hemorrhoids,14 fistula and 11 fissure.The rate of disqualification from 2012 to 2015 was 48.28%, 33.33%, 31.37%, 39.69%and there was no significant statistical difference between each two years (x2 =2.6154,P=0.4548).There was statistically significant difference(P=0<0.05)in hemorrhoids standards between CAF and USAF,and significant difference in fistula and fissure standards.Conclusion Compared with Chinese medical se-lection standards,the US Air Force standards focus on whether the symptoms of disease have effect on air safety and effi-ciency.To improve our medical selection standards,we need to learn from foreign air forces and take our own conditions into account.