BACKGROUND:Lijin manipulation can promote skeletal muscle repair and treat skeletal muscle injury.However,the formation of fibrosis and scar tissue hyperplasia are closely related to the quality of skeletal muscle repair.To study the regulatory effect of Lijin manipulation on the formation of fibrosis and scar tissue hyperplasia is helpful to explain the related mechanism of Lijin manipulation to improve the repair quality of skeletal muscle injury. OBJECTIVE:To explore the mechanism of Lijin manipulation to improve the repair quality of skeletal muscle injury in rabbits,thereby providing a scientific basis for clinical treatment. METHODS:Forty-five healthy adult Japanese large-ear white rabbits were randomly divided into blank group,model group and Lijin group,with 15 rats in each group.Gastrocnemius strike modeling was performed in both model group and Lijin group.The Lijin group began to intervene with tendon manipulation on the 3rd day after modeling,once a day,and 15 minutes at a time.Five animals in each group were killed on the 7th,14th and 21st days after modeling.The morphology and inflammatory cell count of gastrocnemius were observed by hematoxylin-eosin staining,the collagen fiber amount was observed by Masson staining,the expression of interleukin-6 and interleukin-10 in gastrocnemius was detected by ELISA.The protein and mRNA expressions of paired cassette gene 7,myogenic differentiation factor,myoblastogenin,alpha-actin,transforming growth factor beta 1,and type Ⅰ collagen were detected by western blot and RT-PCR,respectively,and the expression of type Ⅰ collagen protein was detected by immunohistochemistry. RESULTS AND CONCLUSION:Hematoxylin-eosin staining and Masson staining showed that compared with the model group,inflammatory cell infiltration and collagen fiber content decreased in the Lijin group(P<0.01),and the muscle fibers gradually healed.ELISA results showed that compared with the model group,the expression of interleukin-6 in the Lijin group continued to decrease(P<0.05),and the expression of interleukin-10 increased on the 7th day after modeling(P<0.05)and then showed a decreasing trend(P<0.05).Western blot and RT-PCR results showed that compared with the model group,the protein and mRNA expressions of paired cassette gene 7,myogenic differentiation factor,myoblastogenin in the Lijin group were significantly increased on the 14th day after modeling(P<0.05),but decreased on the 21st day(P<0.05);the protein and mRNA expressions of alpha-actin,transforming growth factor beta 1,and type Ⅰ collagen in the Lijin group were significantly decreased compared with those in the model group(P<0.05).Immunohistochemical results showed that the expression of type Ⅰ collagen in the Lijin group was significantly lower than that in the model group(P<0.05).To conclude,Lijin manipulation could improve the repair quality of skeletal muscle injury by inhibiting inflammation,promoting the proliferation and differentiation of muscle satellite cells,and reducing fibrosis.

Tumors are the second leading cause of death worldwide. Exosomes are a type of extracellular vesicle secreted from multivesicular bodies, with particle sizes ranging from 40 to 160 nm. They regulate the tumor microenvironment, proliferation, and progression by transporting proteins, nucleic acids, and other biomolecules. Compared with other drug delivery systems, exosomes derived from different cells possess unique cellular tropism, enabling them to selectively target specific tissues and organs. This homing ability allows them to cross biological barriers that are otherwise difficult for conventional drug delivery systems to penetrate. Due to their biocompatibility and unique biological properties, exosomes can serve as drug delivery systems capable of loading various anti-tumor drugs. They can traverse biological barriers, evade immune responses, and specifically target tumor tissues, making them ideal carriers for anti-tumor therapeutics. This article systematically summarizes the methods for exosome isolation, including ultracentrifugation, ultrafiltration, size-exclusion chromatography (SEC), immunoaffinity capture, and microfluidics. However, these methods have certain limitations. A combination of multiple isolation techniques can improve isolation efficiency. For instance, combining ultrafiltration with SEC can achieve both high purity and high yield while reducing processing time. Exosome drug loading methods can be classified into post-loading and pre-loading approaches. Pre-loading is further categorized into active and passive loading. Active loading methods, including electroporation, sonication, extrusion, and freeze-thaw cycles, involve physical or chemical disruption of the exosome membrane to facilitate drug encapsulation. Passive loading relies on drug concentration gradients or hydrophobic interactions between drugs and exosomes for encapsulation. Pre-loading strategies also include genetic engineering and co-incubation methods. Additionally, we review approaches to enhance the targeting, retention, and permeability of exosomes. Genetic engineering and chemical modifications can improve their tumor-targeting capabilities. Magnetic fields can also be employed to promote the accumulation of exosomes at tumor sites. Retention time can be prolonged by inhibiting monocyte-mediated clearance or by combining exosomes with hydrogels. Engineered exosomes can also reshape the tumor microenvironment to enhance permeability. This review further discusses the current applications of exosomes in delivering various anti-tumor drugs. Specifically, exosomes can encapsulate chemotherapeutic agents such as paclitaxel to reduce side effects and increase drug concentration within tumor tissues. For instance, exosomes loaded with doxorubicin can mitigate cardiotoxicity and minimize adverse effects on healthy tissues. Furthermore, exosomes can encapsulate proteins to enhance protein stability and bioavailability or carry immunogenic cell death inducers for tumor vaccines. In addition to these applications, exosomes can deliver nucleic acids such as siRNA and miRNA to regulate gene expression, inhibit tumor proliferation, and suppress invasion. Beyond their therapeutic applications, exosomes also serve as tumor biomarkers for early cancer diagnosis. The detection of exosomal miRNA can improve the sensitivity and specificity of diagnosing prostate and pancreatic cancers. Despite their promising potential as drug delivery systems, challenges remain in the standardization and large-scale production of exosomes. This article explores the future development of engineered exosomes for targeted tumor therapy. Plant-derived exosomes hold potential due to their superior biocompatibility, lower toxicity, and abundant availability. Furthermore, the integration of exosomes with artificial intelligence may offer novel applications in diagnostics, therapeutics, and personalized medicine.

Objective:To explore the application value of qualitative characteristics and quantitative parameters of contrast-enhanced ultrasound (CEUS) in the differential diagnosis of pancreatic ductal adenocarcinoma (PDAC) and non-PDAC presenting as pancreatic solid focal lesions.Methods:A retrospective analysis was conducted on 64 cases of PDAC(the PDAC group) and 52 cases of non-PDAC(the non-PDAC group) who underwent CEUS examination at Tianjin Medical University Cancer Institute and Hospital from July 2022 to June 2023. Clinical characteristics, two-dimensional ultrasound features, CEUS qualitative characteristic, and quantitative parameters were compared between the two groups. ROC curves were plotted, and the Delong test was used to evaluate the diagnostic performance of qualitative and quantitative analyses in distinguishing PDAC from non-PDAC. Binary logistic regression analysis was employed to assess the independent predictors of PDAC.Results:①There were significant differences in serum CA19-9, lesion size, boundary, the main pancreatic duct (MPD) diameter, degree of enhancement and enhancement pattern between the PDAC group and the non-PDAC group (all P<0.05). ②The relative peak intensity (rPE), and relative wash-in and wash-out area under the curve (rWiWoAUC) were lower in the PDAC group than the non-PDAC group, with statistically significant differences(all P<0.001). ③The areas under the curve (AUC) for diagnosing PDAC using enhancement pattern, venous phase(VP) enhancement degree, rPE, and rWiWoAUC were 0.698, 0.707, 0.863, and 0.867, respectively. The AUCs of quantitative parameters were superior to those of qualitative characteristics, with statistically significant differences ( P<0.05). Using CEUS mode B, low VP enhancement, rPE<72.44, and rWiWoAUC<86.59 as cut-off values, the accuracies for diagnosing PDAC were 0.698, 0.741, 0.828, and 0.802, respectively. ④Serum CA19-9, lesion size, MPD diameter, rPE, and rWiWoAUC were independent predictors of PDAC (all P<0.05). Conclusions:CEUS qualitative and quantitative analyses are helpful in the differential diagnosis of PDAC and non-PDAC, with rPE and rWiWoAUC being useful indicators for diagnosing PDAC.

Objective: To investigate the clinicopathological features of verrucous type (squamous) dysplasia of esophagus. Methods: The clinicopathological data of 18 verrucous type dysplasia of esophagus patients in the 989th Hospital of the Joint Logistics Support Force of the People's Liberation Army (formerly 152 Central Hospital) and Beijing Chaoyang Hospital Affiliated to Capital Medical University from 2009 to 2021 were retrospectively collected. The histomorphologic characteristics and immunophenotype were observed, and human papillomavirus (HPV) genotyping was detected by PCR-fluorescence probe. The relevant literature was reviewed. Results: The median age of the 18 patients was 68 years (range 53-76 years); there were 13 males and 5 females. There were four cases in the upper esophagus, seven in the middle esophagus and seven in the lower esophagus. The median diameter of the lesion was 18 mm (range 6-54 mm). According to the Paris Classification, 11 cases were 0-Ⅱa, one case was 0-Ⅱa+Ⅰ, five cases were 0-Ⅱb, and one case was 0-Ⅱb+Ⅰ. White light endoscopy showed that the surface of the lesion was white plaque, red areas between the plaques, and papillary surface structure could be seen. In narrow-band imaging, some mucosal areas of lesions were opaque or patchy and light brown, and papillary microsurface structures were different in shapes and sizes. Intraepithelial microvessels were elongated, dilated, twisted and varied in diameter. Lugol iodine stain showed nil to faint staining. Histologically, the atypia cells were large with rounded to irregular nuclei, coarse chromatin, mitotic figures, and abundant eosinophilic cytoplasm. The basal cells showed increased atypia, crowding, increased nuclear-cytoplasmic ratio, and active mitosis. The cells were arranged haphazardly. Single cell keratinization, binuclear cells, and hollow-out-like cells, as well as surface epithelial keratinization and parakeratosis were observed in three cases. There were obvious verrucous or papillary structures in the epithelial layer. Five patients had local verrucous carcinoma. Immunohistochemical staining showed that the mutant expression of p53 protein in 6/10 cases; p16 was positive in 5/10 cases; abnormal Ki-67 distribution pattern in 10/10 cases. HPV was negative in all 10 cases tested. The original pathologic diagnosis of preoperative biopsy was high-grade dysplasia in 8 cases, low-grade dysplasia in 6 cases and atypical squamous epithelial cells in 4 cases. Conclusions: Esophageal verrucous dysplasia tumor cells are well differentiated with obvious verrucous or papillary structures. The unique morphological features suggest that it represents a histological subtype of esophageal squamous high-grade dysplasia and it is a precursor of verrucous carcinoma. Its preoperative biopsy diagnosis is challenging.
Humans ; Middle Aged ; Aged ; Papillomavirus Infections ; Retrospective Studies ; Carcinoma, Verrucous/genetics* ; Carcinoma, Squamous Cell

Echinococcosis is a zoonotic parasitic disease caused by Echinococcus infections, and this disorder may cause fibrosis of multiple vital organs, which may further progress into cirrhosis. Early-stage hepatic fibrosis is reversible, and unraveling the mechanisms underlying hepatic fibrosis induced by Echinococcus infections is of great significance for the prevention and treatment of early-stage hepatic fibrosis. Recently, the studies pertaining to hepatic fibrosis associated with Echinococcus infections focus on cytokines and immune cells. This review summarizes the advances in the mechanisms underlying host immune cells- and cytokines-mediated hepatic fibrosis in humans or mice following Echinococcus infections.

Objective:To investigate the knowledge, attitudes, and practices (KAP) of pulse oximetry among pediatric healthcare providers in China and analyze the factor influencing the KAP.Methods:A self-developed questionnaire was used for an online research on the KAP of 11 849 pediatric healthcare providers from 31 provinces, autonomous regions, and municipalities of China from March 11 to 14, 2022.The factors influencing the KAP of pulse oximetry among pediatric healthcare providers were examined by Logistic regression. Results:The scores of KAP, of pulse oximetry were 5.57±0.96, 11.24±1.25 and 11.19±4.54, respectively.The corresponding scoring rates were 69.61%, 74.95%, and 55.99%, respectively. Logistic regression results showed that the gender and working years of pediatric healthcare providers, the region they were located, and whether their medical institution was equipped with pulse oximeters were the main factors affecting the knowledge score (all P<0.05). Main factors influencing the attitude score of pediatric healthcare providers included their knowledge score, gender, educational background, working years, region, medical institution level, and whether the medical institution was equipped with pulse oximeters (all P<0.05). For the practice score, the main influencing factors were the knowledge score, gender, age, and whether the medi-cal institution was equipped with pulse oximeters (all P<0.05). Conclusions:Chinese pediatric healthcare providers need to further improve their knowledge about and attitudes towards pulse oximetry.Pulse oximeters are evidently under-used.It is urgent to formulate policies or guidelines, strengthen education and training, improve knowledge and attitudes, equip more institutions with pulse oximeters, and popularize their application in medical institutions.

Objective: To analyze the epidemiological characteristics of influenza clusters in Hangzhou from 2018 to 2019, so as to provide references for the prevention and control of influenza. Methods: The data came from the epidemic investigation reports of influenza clusters in Hangzhou from the 27th week of 2018 and the 26th week of 2019. The time distribution, school types, population distribution and etiology of influenza were analyzed. Multivariate logistic regression model was employed to analyze the influencing factors for the attack rate of influenza clusters. Results: During the surveillance season, a total of 231 school influenza clusters involving 4 233 cases were reported. The median of the attack rate was 21.74%. The peak of the clusters was in March 2019, with 89 events and 1 476 cases ( 34.87% ). The clusters occurred mainly in primary schools ( 188 events, 81.39% ) and were mainly caused by Victoria-like strains of influenza B virus ( 84 events, 36.36% ). The multivariate logistic regression analysis indicated that infection of teachers increased the risk of high attack rate ( OR=3.133, 95%CI: 1.180-8.320 ), and kindergartens had higher risk of high attack rate than primary schools ( OR=4.123, 95%CI: 1.579-10.763 ). Conclusions The influenza clusters in Hangzhou from 2018 to 2019 is mainly caused by Victoria-like strains of influenza B virus. Kindergartens and teachers are the key points for the prevention and control of influenza clusters.

IMM0306 is a recombinant human signal regulatory protein α-anti-CD20 mouse chimeric antibody fusion protein, intended to treat refractory or recurrent CD20 positive B-cell non-Hodgkin lymphoma (B-NHL) in clinical. In this study, an ELISA method was established to evaluate the pharmacokinetics of IMM0306 in human serum. The experiment was approved by the Ethics Committee of the Cancer Hospital of the Chinese Academy of Medical Sciences (No. CTR20192612). Recombinant human CD47 protein was coated with the plate overnight, blocking the plate with 5% skin milk for 2 h. After washing, 100 μL per well standard and unknown samples were added, and incubated for 1.5 h. After washing, the detection antibody Anti-IMM0306-Biotin was added and incubated for 1 h, and then HRP-labeled streptavidin was added for 1 h, and the color was detected. The optimal concentration of coating reagent was 2 μg·mL^-1 by ELISA method, and the optimal dilution of anti-IMM0306-biotin and SA-HRP were 1∶500 and 1∶5 000, respectively. The lower limit of quantitation was 4 ng·mL^-1, and the standard curve range was 4-100 ng·mL^-1. The verification results of the method meets the corresponding acceptance criteria, and can be used in IMM0306 clinical pharmacokinetic studies.

Lancang-Mekong Cooperation is a new type of subregional cooperation mechanism initiated and built by China and other five countries of the Lancang-Mekong subregion, namely Laos, Myanmar, Thailand, Cambodia, and Vietnam. Countries in the Lancang-Mekong subregion are geographically and culturally connected, and they have nurtured their unique traditional medicine. By combing the history of traditional medicine exchanges between China and other Lancang-Mekong countries and their progress of modern research, this paper summarized the challenges and opportunities of traditional medicine cooperation in the Lancang-Mekong subregion. It has been found that many regional cooperation mechanisms coexist for a long time in the Lancang-Mekong subregion and the medicinal resources are abundant. However, the degree of their development and utilization varies, and modern scientific research is insufficient. Lancang-Mekong Cooperation has provided a strong support for integrating the advantageous resources in Lancang-Mekong subregion countries and making progress together. Focusing on the development and protection of medicinal resources, this paper puts forward a new path of cooperation in the intellectual property rights and characteristic seed resource protection, the compilation of universal herbal pharmacopoeia in various countries, the research and development of public health products, and the construction of traditional herbal industry bases, thus enabling the traditional medicine to better protect the public health and building a human health community.
China ; Humans ; Materia Medica ; Medicine, Traditional ; Rivers ; Thailand

Objective:To establish an artificial intelligence (AI)-assisted diagnostic system for lung cancer via deep transfer learning.Methods:The researchers collected 519 lung pathologic slides from 2016 to 2019, covering various lung tissues, including normal tissues, adenocarcinoma, squamous cell carcinoma and small cell carcinoma, from the Beijing Chest Hospital, the Capital Medical University. The slides were digitized by scanner, and 316 slides were used as training set and 203 as the internal test set. The researchers labeled all the training slides by pathologists and establish a semantic segmentation model based on DeepLab v3 with ResNet-50 to detect lung cancers at the pixel level. To perform transfer learning, the researchers utilized the gastric cancer detection model to initialize the deep neural network parameters. The lung cancer detection convolutional neural network was further trained by fine-tuning of the labeled data. The deep learning model was tested by 203 slides in the internal test set and 1 081 slides obtained from TCIA database, named as the external test set.Results:The model trained with transfer learning showed substantial accuracy advantage against the one trained from scratch for the internal test set [area under curve (AUC) 0.988 vs. 0.971, Kappa 0.852 vs. 0.832]. For the external test set, the transferred model achieved an AUC of 0.968 and Kappa of 0.828, indicating superior generalization ability. By studying the predictions made by the model, the researchers obtained deeper understandings of the deep learning model.Conclusions:The lung cancer histopathological diagnostic system achieves higher accuracy and superior generalization ability. With the development of histopathological AI, the transfer learning can effectively train diagnosis models and shorten the learning period, and improve the model performance.