Brain organoids are three-dimensional (3D) neural cultures that self-organize from pluripotent stem cells (PSCs) cultured in vitro. Compared with traditional two-dimensional (2D) neural cell culture systems, brain organoids demonstrate a significantly enhanced capacity to faithfully replicate key aspects of the human brain, including cellular diversity, 3D tissue architecture, and functional neural network activity. Importantly, they also overcome the inherent limitations of animal models, which often differ from human biology in terms of genetic background and brain structure. Owing to these advantages, brain organoids have emerged as a powerful tool for recapitulating human-specific developmental processes, disease mechanisms, and pharmacological responses, thereby providing an indispensable model for advancing our understanding of human brain development and neurological disorders. Despite their considerable potential, conventional brain organoids face a critical limitation: the absence of a functional vascular system. This deficiency results in inadequate oxygen and nutrient delivery to the core regions of the organoid, ultimately constraining long-term viability and functional maturation. Moreover, the lack of early neurovascular interactions prevents these models from fully recapitulating the human brain microenvironment. In recent years, the introduction of vascularization strategies has significantly enhanced the physiological relevance of brain organoid models. Researchers have successfully developed various vascularized brain organoid models through multiple innovative approaches. Biological methods, for example, involve co-culturing brain organoids with endothelial cells to induce the formation of static vascular networks. Alternatively, co-differentiation strategies direct both mesodermal and ectodermal lineages to generate vascularized tissues, while fusion techniques combine pre-formed vascular organoids with brain organoids. Beyond biological approaches, tissue engineering techniques have played a pivotal role in promoting vascularization. Microfluidic systems enable the creation of dynamic, perfusable vascular networks that mimic blood flow, while 3D printing technologies allow for the precise fabrication of artificial vascular scaffolds tailored to the organoid’s architecture. Additionally, in vivo transplantation strategies facilitate the formation of functional, blood-perfused vascular networks through host-derived vascular infiltration. The incorporation of vascularization has yielded multiple benefits for brain organoid models. It alleviates hypoxia within the organoid core, thereby improving cell survival and supporting long-term culture and maturation. Furthermore, vascularized organoids recapitulate critical features of the neurovascular unit, including the early structural and functional characteristics of the blood-brain barrier. These advancements have established vascularized brain organoids as a highly relevant platform for studying neurovascular disorders, drug screening, and other applications. However, achieving sustained, long-term functional perfusion while preserving vascular structural integrity and promoting vascular maturation remains a major challenge in the field. In this review, we systematically outline the key stages of human neurovascular development and provide a comprehensive analysis of the various strategies employed to construct vascularized brain organoids. We further present a detailed comparative assessment of different vascularization techniques, highlighting their respective strengths and limitations. Additionally, we summarize the principal challenges currently faced in brain organoid vascularization and discuss the specific technical obstacles that persist. Finally, in the outlook section, we elaborate on the promising applications of vascularized brain organoids in disease modeling and drug testing, address the main controversies and unresolved questions in the field, and propose potential directions for future research.

To review the application,acceptance,evaluation and funding of the General,Youth and Regional Science Fund supported by Chinese National Natural Science Foundation in traditional Chinese medicine in 2017.There were 4 472 applications in the subject,114 of which failed in the formal examination,4 358 applications were accepted in the next assessment step;1 403 applications got more than 2 recommendations after peer assessment and 637 applications were funded in the end.The major problems in every step of Science Fund were analyzed in this paper.The author hopes all applicants should pay attention to the problems,and then improve the quality of applications in the field.

OBJECTIVETo compare the short-term efficacy between totally laparoscopic distal gastrectomy(TLDG) with delta-shaped anastomosis (DS) and laparoscopic-assisted distal gastrectomy (LADG) with BrillrothI ( anastomosis (BI(), and to evaluate the application of DS.

METHODSBetween March 2013 and February 2014, 50 patients underwent TLDG with DS using linear staplers, and 43 patients underwent LADG with BI( using circular staplers. Clinical features and short-term efficacy of the two groups were analyzed retrospectively.

RESULTSThere were no significant differences between the two groups in terms of demographic indicators, operation time, intraoperative blood loss, number of removal lymph node, time to first flatus, incidence of complication and postoperative discharge day(all P>0.05). First-day postoperative pain was milder (3.1 ± 1.0 vs. 4.6 ± 1.4), and operative incision was shorter [(3.4 ± 0.4) cm vs. (6.9 ± 0.8) cm] significantly in TLDG with DS group(P<0.05).

CONCLUSIONTLDG with DS is safe and feasible for patients with gastric cancer, and has more advantages in cosmetic and comfort level than LADG with BI.

Anastomosis, Surgical ; Gastrectomy ; Humans ; Laparoscopy ; Lymph Node Excision ; Operative Time ; Postoperative Period ; Retrospective Studies ; Stomach ; surgery ; Stomach Neoplasms

OBJECTIVETo summarize the electroclinical characteristics of myoclonic atonic epilepsy (MAE) in children.

METHODThe clinical data, video electroencephalogram (EEG) and simultaneous electromyography (EMG) of MAE patients were analyzed. The treatment and its effects were followed up.

RESULTIn 47 MAE patients, 25 had a history of febrile seizures (FS), 20 had a family history of FS or epilepsy. All patients had a normal development before the illness. The age of afebrile seizure onset was between 1.4 years to 5.8 years. The first seizure was generalized tonic-clonic seizure (GTCS) in 41 patients (87.2%). All patients had multiple seizure types, including 47 GTCS (97.9%), 34 myoclonic atonic seizures (72.3%), 47 myoclonic seizures (100%), 32 atonic seizures (68.1%), 36 atypical absences (76.6%) and 3 tonic seizures (6.4%). EEG backgrounds were slow or parietal θ rhythm, interictal EEG showed 1-4 Hz (predominant 2-3 Hz) generalized spike and wave or poly spike and wave discharges in all cases. Seizures were controlled by antiepileptic drugs (AEDs) in 41 patients (87.2%). Valproate was used in 37. Lamotrigine was used in 26. Mild mental retardation was observed in 10 children after the onset of the illness.

CONCLUSIONThe clinical features of MAE included the following: the development was normal before the onset of the illness; the onset of seizure type was often GTCS. All patients had multiple generalized seizure types. Myoclonic atonic seizure was its characteristic seizure type. EEG showed generalized discharges. Early diagnosis and rational choice of AEDs are important for getting a better prognosis.

Child ; Child, Preschool ; Electroencephalography ; Epilepsies, Myoclonic ; diagnosis ; physiopathology ; therapy ; Epilepsy, Generalized ; diagnosis ; physiopathology ; therapy ; Female ; Humans ; Infant ; Male

BACKGROUNDEndobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) can sample the enlarged mediastinal lymph nodes which are unreachable by conventional bronchoscopy. It is a relatively simple and safe method to see beyond the bronchial tree. We describe and discuss its initial application and our experience.

METHODSFrom July 2009 to December 2009, 52 patients with undiagnosed enlarged mediastinal lymph nodes were accessed with EBUS-TBNA in the People's Liberation Army General Hospital. Conventional bronchoscopy was performed before EBUS-TBNA, and patients with endobronchial lesions were excluded from this study. Smears fixed in 95% alcohol and histological specimens fixed in formalin were sent to Department of Pathology.

RESULTSEBUS-TBNA was diagnostic in 33 (63%) patients, with diagnosis of lung cancer in 23 patients (14 patients of small cell lung cancer, eight patients with adenocarcinoma, and one patient of squamous carcinoma). Four patients, who had negative EBUS-TBNA results, were later diagnosed with malignancy at thoracotomy. One patient with negative EBUS-TBNA results died of cancer cachexia. The sensitivity, specificity, and positive and negative predictive value of EBUS-TBNA for the diagnosis of neoplastic disease were 85%, 100%, 100%, and 50% respectively. Among the 16 sarcoidosis patients, who were diagnosed by a combination of the clinical and radiological information as well as pathological results obtained by EBUS-TBNA, nine of them had granulomas and benign lymphoid cells detected by EBUS-TBNA. The sensitivity, specificity, and positive and negative predictive value of EBUS-TBNA for the diagnosis of sarcoidosis were 56%, 100%, 100%, and 13%, respectively. Five patients with no definite diagnosis from EBUS-TNBA examination are under close follow-up.

CONCLUSIONSEBUS-TBNA can provide a safe and effective method to sample mediastinal leisions suspected of malignancy. It also adds pathological information needed to make the diagnosis of sarcoidosis.

Adolescent ; Adult ; Aged ; Aged, 80 and over ; Biopsy, Fine-Needle ; methods ; Bronchi ; diagnostic imaging ; pathology ; Endosonography ; methods ; Female ; Humans ; Lung Neoplasms ; diagnosis ; Lymphatic Diseases ; diagnosis ; pathology ; Male ; Middle Aged ; Neoplasm Staging ; methods ; Young Adult

OBJECTIVETo investigate the incidences of urea cycle defects (UCDs) in the patients with hyperammonemia and study their etiology, clinical and laboratory features.

METHODSIn the past 7 years, 26 cases (10.2%) of UCDs were detected from 254 patients with hyperammonemia. The etiological diagnoses were made by blood amino acids analysis, urinary organic acid analysis and blood acylcarnitine profile analysis. Three patients with citrullinemia type II were further confirmed by liver pathological analysis and gene diagnosis.

RESULTSAmong 26 cases with UCDs, 15 had ornithine transcarbamylase (OTC) deficiency, 5 had citrullinemia type I, 3 had citrullinemia type II and 3 patients had arginemia. The age of onset of the patients ranged from 3 days to 13 years. Three cases (11.5%) developed hyperammonemic encephalopathy during neonatal period. Thirteen (50.0%), 7 (26.9%) and 3 (11.5%) cases developed clinical symptoms at the age of 1 to 12 months, 1 to 3 years and 6 to 13 years, respectively. Positive family history was found in 11 cases (42.3%). Among 26 patients with UCDs, 9 (34.6%) were hospitalized with the complains of seizures, psychomotor retardation, vomiting and unconsciousness, 8 (30.8%) with recurrent vomiting, headache and coma, 6 due to liver dysfunction. Intrahepatic cholestatic jaundice was found in 3 patients with citrullinemia type II. Blood ammonia ranged from 58 to 259 micromol/L on their first visit to our hospital. Twenty cases (76.9%) had liver dysfunction, 4 patients (15.4%) were diagnosed postmortem. Twenty-one patients got treatment and were followed up. Among them, 7 cases died of hyperammonemic encephalopathy or upper alimentary tract bleeding. Clinical improvement was observed in 14 cases. A boy with OTC deficiency who received a partial liver transplant from his mother showed normal general condition for two years.

CONCLUSIONSUCDs are the most frequent causes of congenital hyperammonemia. In this study, 26 patients (10.2%) with UCDs were identified from 254 patients with hyperammonemia resulting in encephalopathy and liver dysfunction. Early diagnosis and treatment can contribute a lot to improve the prognosis of the patients. Blood ammonia assay and further etiological analysis should be considered in the differential diagnosis of neurological and hepatic abnormality.

Adolescent ; Ammonia ; blood ; Child ; Child, Preschool ; Female ; Follow-Up Studies ; Humans ; Hyperammonemia ; congenital ; diagnosis ; genetics ; Infant ; Infant, Newborn ; Male ; Urea ; metabolism

OBJECTIVETo observe the acute and chronic renal toxicity induced by Radix Aristolochiae Fangchi Extract (RAFE) in different doses in rats.

METHODThe conventional method of acute toxicity was used. RAFE at the dose of 25.0 mg x kg(-1) x d(-1), 120.0 mg x kg(-1) x d(-1) and 200.0 mg x kg(-1) x d(-1) and aristolochic acid (AA, 10.0 mg x kg(-1) x d(-1)) were interruptedly administrated to rats for 13 week by gastric tube, and the sample of blood, urine and kidney were collected at 4 week, 8 week and 13 week respectively. The indexes of renal function were measured and the morphology of kidney was observed.

RESULTLD50 of RAFE was 36.8 g x kg(-1) (the crude drug) and the 95% confidence limit was 38.8 - 28.9 g x kg(-1). The changes of renal functions were azotemia, massive proteinuria and the increase of urinary NAGase (beta-N-acetylglucosaminidase) in the earlier period of administration with RAFE in rats. Pathological changes of renal tissue were as follows: acute renal tubular necrosis mainly in the boundary of cortex and medulla was observed in the earlier period, and with the elongation of administration, the pathological process of renal interstitial fibrosis observed in the middle and high groups of RAFE and AA group.

CONCLUSIONRAFE at middle and high doses administrated by interrupted gavage above 13 week can cause the injury of renal tubular functions in rats. NAGase can be used as one of observation targets in the earlier period of renal injury.

Acetylglucosaminidase ; urine ; Animals ; Aristolochia ; chemistry ; toxicity ; Aristolochic Acids ; isolation & purification ; toxicity ; Blood Urea Nitrogen ; Body Weight ; drug effects ; Dose-Response Relationship, Drug ; Drugs, Chinese Herbal ; administration & dosage ; isolation & purification ; toxicity ; Female ; Fibrosis ; chemically induced ; Kidney Tubules ; pathology ; Male ; Mice ; Plant Roots ; chemistry ; toxicity ; Plants, Medicinal ; chemistry ; toxicity ; Proteinuria ; chemically induced ; Random Allocation ; Rats ; Rats, Sprague-Dawley

OBJECTIVEFollowing the former report, we continue to observe the chronic renal tubular-interstitial injury induced by Radix Aristolochiae Fangchi Extract(RAFE) in rats in order to understand whether RAFE in different doses causes the renal tubular-interstitial injury or not.

METHODRAFE at the dose of 25.0 mg x kg(-1) x d(-1), 120.0 mg kg(-1) x d(-1) and 200.0 mg x kg(-1) x d(-1) and aristolochic acid (AA, 10.0 mg x kg(-1) d(-1)) was interruptedly administrated by gastric tube for 22 w and 4 w durg withdrawal. Blood, urine and kidney were taken out respectively in 17 w, 22 w and 26 w to measure the indexes of renal function. The morphology of kidney was observed, and Masson staining of kidney were made respectively to compare RAFE groups with AA group.

RESULTPathological changes of renal tissue forms were as follows: All RAFE groups and AA group could develop the pathological process of renal tubular injury-chronic renal interstitial fibrosis. The pathologic changes of RAFE were similar with AA.

CONCLUSIONRAFE at all doses administrated interruptedly by gastric tube above 13 w caused chronic renal tubulo-interstitium fibrosis. The renal injury in functions and tissue forms in rats were similar with AA closely. The results showed that AA was the main toxic composition of RAFE.

Animals ; Aristolochia ; chemistry ; toxicity ; Aristolochic Acids ; isolation & purification ; toxicity ; Blood Urea Nitrogen ; Body Weight ; drug effects ; Dose-Response Relationship, Drug ; Drugs, Chinese Herbal ; administration & dosage ; isolation & purification ; toxicity ; Female ; Fibrosis ; blood ; chemically induced ; pathology ; Kidney Tubules ; pathology ; Male ; Nephritis, Interstitial ; blood ; chemically induced ; pathology ; Plant Roots ; chemistry ; toxicity ; Plants, Medicinal ; chemistry ; toxicity ; Proteinuria ; chemically induced ; Rats ; Rats, Sprague-Dawley

OBJECTIVEThe acute toxic effects of Aristolochia manshuriensis (GMT) and the total aristolochic acids (TA) were compared in mice with aristolochic acid A (AA) as the dose standard. The dose relationship of the renal toxicity induced by Aristolochia manshuriensis was determined.

METHODA single dose of GMT extract or TA was given intragastrically to mice at different doses. LD50 values, the blood levels of BUN, Cr and ALT were measured. A histomorphological study was also performed in livers and kidneys of mice.

RESULTLD50 value of GMT extract was 4.4 g x kg(-1) which was equivalent to 40 mg x kg(-1) as calculated by the content of AA in GMT extract, and this value was comparable with LD50 obtained from TA given intragastrically in mice (equivalent to 33 mg x kg(-1) of AA for male and 37 mg x kg(-1) for female). GMT extract caused a significant increase in blood BUN and Cr and an obvious morphological change in kidney in a dose-dependent manner at doses of AA 4.5 mg x kg(-1) and above. Liver damage, characterized by both an increase in blood level of AST and histomorphological change, was observed at doses of AA 25 mg x kg(-1) and above. All changes were in proportion to the doses of AA.

CONCLUSIONGMT causes both renal and liver toxicity. The dose leading to nephrotoxicity is much lower than that inducing hepatatoxicity. Aristolochic acids existed in GMT are the main toxic components to cause renal toxicity which is a crucial cause to result in death. The lethality and nephrotoxicity of GMT is in proportion to the doses of AA.

Alanine Transaminase ; blood ; Animals ; Aristolochia ; chemistry ; Aristolochic Acids ; administration & dosage ; isolation & purification ; toxicity ; Aspartate Aminotransferases ; blood ; Blood Urea Nitrogen ; Creatinine ; blood ; Dose-Response Relationship, Drug ; Drugs, Chinese Herbal ; administration & dosage ; isolation & purification ; toxicity ; Female ; Kidney ; pathology ; Lethal Dose 50 ; Liver ; pathology ; Male ; Mice ; Mice, Inbred ICR ; Random Allocation

OBJECTIVETo explore the temporal profile of serum antibody against coronavirus in patients with severe acute respiratory syndrome (SARS), and to evaluate the reliability of indirect immuno-fluorescence assay (IFA) in the diagnosis of SARS.

METHODSClinically confirmed SARS patients, suspected SARS patients, and controls were included in the study. IFA was used to detect the serum antibody against SARS coronavirus. General information about the subjects was collected using a standard questionnaire.

RESULTSThe positive rates of specific IgG and IgM against SARS virus within 10 days after onset of the disease were 55.1% and 16.3% respectively and then increased up to 89.8% for IgG and 65.3% for IgM. After 25 days of the onset of the disease, 90.9% patients became positive for both IgG and IgM. Results from chi-square for trend test revealed that the positive rates of both IgG and IgM increased with time (chi(2) for trend = 16.376, P = 0.00005 for IgG; chi(2) for trend = 28.736, P = 0.00000 for IgM). Sensitivity, specificity and agreement value of IFA regarding the diagnosis of SARS were all higher than 90%.

CONCLUSIONIFA can be used to assist diagnosis of SARS after 10 days of the onset of disease.

Antibodies, Viral ; blood ; Enzyme-Linked Immunosorbent Assay ; Fluorescent Antibody Technique, Indirect ; methods ; Humans ; Immunoglobulin G ; blood ; Immunoglobulin M ; blood ; SARS Virus ; immunology ; Severe Acute Respiratory Syndrome ; diagnosis