Objective To examine the therapeutic effect of Kummerowia striata (KS) on IgA nephropathy (IgAN) rats.Methods Sixty SD rats were equally randomized into 6 groups after adaptive feeding for 3 days:blank control group,model control group,tripterygium glycosides (TG) group (in the dose of 0.0165 g/kg),and high-,middle-and low-dose KS groups (in the dose of 16.0,8.0,4.0 g/kg respectively).IgAN rat model was established with bovine serum albumin (BSA),lipopolysaccharide (LPS) and carbon tetrachloride.After modeling,rats except those in blank control group received gastric gavage of corresponding drugs for 10 continuous weeks.Levels of 24-hour proteinuria and hematuria in each group were measured,serum levels of total protein (TP),serum albumin (ALB),aspartate aminotransferase (AST),and alanine aminotransferase (ALT) were tested.The pathological changes of renal tissue were observed under light microscope by HE staining.Results Water decoction of KS could significantly decrease the proteinuria and hematuria levels,and reduce renal pathological changes of IgAN model rats.However,water decoction had no effect on indicators of liver function such as TP,ALB,AST,and ALT in IgAN rats.Conclusion KS has certain therapeutic effect on IgAN model rats.

BACKGROUND:Neural stem cells have self-renewal and multidirectional differentiation potential, but under normal circumstances, the number of neural stem cells is less, and most cells are in the resting state. Thus, to promote the proliferation of neural stem cells is the key to the treatment of neurodegenerative diseases. OBJECTIVE:To investigate the effects of osthole on the proliferation of neural stem cells cultured in vitro, and to analyze its mechanism underlying promoting the proliferation. METHODS:Neural stem cells were cultured in vitro, and passage 3 cells were cultured with different concentrations of osthole(10, 50 and 100μmol/L). After 24 hours, cellvitality was determined by cellcounting kit-8. After 3, 5, 7 days of further culture, the radius of neurospheres was measured, and Ki67-positive cells were counted by immunofluorescence staining. Meanwhile, after 3 days of further culture, the gene expression of Notch 1, Hes 1 and Mash 1 in neural stem cells was detected by RT-PCR. RESULTS AND CONCLUSION:Compared with the control group, 50, 100μmol/L osthole could obviously promote the proliferation ability of neural stem cells. 100μmol/L osthole had the most significant effect and increased the expression of Notch 1 gene, Hes 1 gene, but it had no effect on Mash 1 gene. These results suggest that osthole can promote proliferation of neural stem cells cultured in vitro and its mechanism may be associated with activation of Notch 1 gene and Hes 1 gene in Notch signaling pathway.

Objective To investigate the effects of osthole on neural stem cells ( NSCs) differentiation and explore the potential mechanism. Methods Brain-derived NSCs from newborn mice were isolated and cultured in vitro and determined by immunofluorescence. The P5 generations of NSCs were placed in culture solution with osthole at concentrations of (0,10,50, 100 μmol·L-1 ) . The neuron, astrocyte and oligodendroglia cell differentiation were determined by immunofluorescence. The mRNA expression of Notch 1 and its target genes Mash 1 and Neurogenin 2 were assessed by RT-PCR. Results The neurosphere displayed Nestin and Sox 2-postive by immunofluorescence, suggesting that the cultured cells were NSCs. Osthole promoted NSCs differentiating into more neuron(P<0. 01) and oligodendrocyte(P<0. 05), but not astrocyte. Meanwhile, osthole significantly reduced the mRNA expression of Notch 1(P<0. 01) and increased Ngn 2(P<0. 01)at the dose of 100 μmol·L-1. Conclusion Osthole enhances NSCs differentiating into more neuron and oligodendrocyte via probablly inhibiting Notch signal pathway.

Objective To investigate the correlation of Bax and apoptosis in enterocytes of neonatal rats with necrotizing enterocolitis (NEC).Methods Forty-eight neonatal rats (1 day) were randomly divided into control group (n =24) and NEC model group (n =24) by use of odd and even.The rats in control group were maternal breast-fed.The rats in NEC model group were separated from their mothers.To be given formula feeding,cold exposure after hypoxic-reoxygenation treatment.The intestinal tissue located at the boundary of ileum and caecum of two groups were gained on the 24 h,48 h and 72 h with which that all rats were sacrificed by cutting neck.Section of intestinal tissue were stained with immunohistochemistry to detect the expression of Bax and were stained with TdT mediated dUTP nick end labeling(TUNEL) to evaluate the apoptosis in each group.Results The integrate optical density (IOD) value of expression of Bax in the NEC model group began to increase on the 24 h [(1 005.06-± 11.96) IOD] and reached the summit on the 72 h [(3 340.66 ±68.72)] compared with the control group[(666.55 ± 15.77)IOD].A few of TUNEL positive cells began to increase with time dependence.A lot of TUNEL positive cells could be found in NEC model group on the 24 h [(15.04 ± 0.24) ％],and the apoptotic index reached the peak on the 72 h [(35.65 ±0.61) ％] compared with the control group[(4.73 ±0.04) ％,P ＜0.01]-There was a significantly positive correlation between the cell apoptosis and the ratio change of Bax in NEC model group (r =0.94,P ＜ 0.01).Conclusion There is a significantly positive correlation between the cell apoptosis and the ratio change of Bax in enterocytes of neonatal rats with NEC.The cell apoptosis in enterocytes of neonatal rats with NEC maybe be induced by Bax.

Objective:Through analysis of the development status of pediatric and the problems faced by pediatric young scientists, combined with the situation of research management, this paper puts forward some suggestions.Methods:Collect the identified problems of pediatric development, summarize the common ones and propose methodological strategies for scientific research management.Results:The development of pediatrics faces problems such as insufficient resources, unreasonable resource allocation and talents shortage.Conclusions:It is recommended to support the development of pediatric according to optimize the scientific research management model, establish a reasonable evaluation and incentive mechanism, establish a pediatric talent training model and team, improve the pediatric research level, and obtain policy support for salary, talent introduction and training, promotion of professional titles, research resources and so on.

Objective To prepare dual-targeted pH-sensitive DOX prodrug-microbubble complex and explore the characterization of complex with ultrasound as well as drug release in vitro . Methods Dual-targeted ligands ,cRGD and folate were conjugated with heparin using carbodiimide method ,and then the dual-targeted pH-sensitive DOX prodrug was synthesized by coupling DOX via a pH-sensitive hydrazone bond . The prodrug was combined with microbubbles to prepare complex by biotin-avidin system . The characterization of complex with/without ultrasound was investigated for size ,morphology and drug loaded capacity .In vitro drug release manner of complex with/without at different pH was analyzed . Results DOX content of the prodrug determined by UV Spectrophotometry was about 18 .9％ . Dynamic laser light scattering analysis( DLS) ,corresponding to transmission electron microscope( TEM ) findings ,revealed its inhomogeneous size distribution [ mean size ( 159 .7 ± 24 .5) nm and ( 1089 .0 ± 174 .9) nm ] . However ,the complex was dispersed into uniform fragment after ultrasound irradiation [ mean size ( 155 .9 ± 29 .8) nm , polymer dispersity index( PDI) 0 .22 ,Zeta potential - ( 20 .6 ± 3 .4) mV ] . The cumulative release rate of DOX from both complex and complex with ultrasound at pH 5 .0 were much faster than that at pH 7 .4 , displaying a pH-triggered release manner . Conclusions Dual-targeted pH-sensitive DOX prodrug-microbubble complex displays excellent drug release activity in acid environment . Uniform fragment and smaller particle size of complex could be achieved via ultrasound irradiation ,promoting DOX accumulation within tumor tissue and facilitating in vivo antitumor ability .

BACKGROUND:The gluteus medius not only abducts the hip joint,but also plays an important role in limiting the external movement of the femoral head.At present,there is a lack of research on the correlation between gluteus medius status and non-traumatic femoral head necrosis. OBJECTIVE:To investigate the relationship between the gluteus medius width ratio and the medial space ratio of the hip joint and the progression of non-traumatic femoral head necrosis,and to explore the effect of gluteus medius atrophy on the surface and necrotic zone stress of the femoral head necrosis through finite element analysis. METHODS:Retrospective analysis of unilateral non-traumatic femoral head necrosis patients admitted to Third Affiliated Hospital of Guangzhou University of Chinese Medicine was performed.All patients were followed up for an average of more than 2 years.They were divided into a collapsed group and a non-collapsed group based on whether there was collapse of the femoral head during the follow-up.Medial space ratio,gluteus medius width ratio,Sharp angle,gluteus medius length ratio,and gluteus medius activation angle were measured and calculated.The differences in these indicators were compared between the two groups.At the first visit and follow-up at 3,6,12,and 24 months,the medial space ratio and gluteus medius width ratio were measured and calculated to explore the changes of these two indicators in the course of non-traumatic femoral head necrosis.In addition,using three-dimensional finite element analysis,a Japanese Investigation Committee classification C1 type femoral head necrosis model was constructed based on CT data.At the same time,based on MRI data,a model of the gluteus medius muscle was constructed and divided into a gluteus medius muscle atrophy group(gluteus medius width ratio:74%-76%)and a gluteus medius muscle normal group(gluteus medius width ratio:94%-96%).Each group constructed 10 models,with 6 degrees of freedom of the distal femur constrained to zero.600 N pressures were applied along the Z-axis to the upper surface of the sacrum.The stress distribution,maximum stress values on the surface and necrotic area of the femoral head,and the maximum displacement of the necrotic area were compared between two groups of models. RESULTS AND CONCLUSION:(1)A total of 153 patients(67 males and 86 females)with 153 hips were included in this study.(2)At the 24-hour follow-up,the medial space ratio of the collapsed group was significantly higher than that of the non-collapsed group(P<0.05).The gluteus medius width ratio of the collapsed group was significantly lower than that of the non-collapsed group(P<0.05).There was no statistically significant difference in Sharp angle,gluteus medius activation angle,and gluteus medius length ratio between the two groups(P>0.05).(3)Since the follow-up time exceeded 3 months,the gluteus medius width ratio of the collapsed group was lower than that of the non-collapsed group(P<0.05).Since the follow-up time exceeded 12 months,the medial space ratio of the collapsed group was higher than that of the non-collapsed group(P<0.05).(4)Pearson correlation analysis showed a significant positive correlation between follow-up time and medial space ratio in the collapsed group(P<0.05),and a significant negative correlation between follow-up time and gluteus medius width ratio(P<0.05).The regression coefficient of gluteus medius width ratio was larger than that of medial space ratio.(5)The group with middle gluteal muscle atrophy showed significant stress concentration on the surface of the femoral head,and the stress zone was significantly located on the outside.The maximum stress on the surface of the femoral head in the group with middle gluteal muscle atrophy was significantly greater than that in the group with normal middle gluteal muscle(P<0.05).There was significant stress concentration in the necrotic area of the middle gluteal muscle atrophy group,and the maximum stress was located at the edge of the necrotic area.The maximum stress and maximum displacement in the necrotic area of the middle gluteal muscle atrophy group were significantly greater than those of the normal group(P<0.05).(6)It is indicated that gluteus medius width ratio is an effective indicator for evaluating changes in gluteal muscle atrophy.In the progression of non-traumatic femoral head necrosis,atrophy of the gluteus medius muscle first occurs,followed by widening of the medial hip joint space.The mechanical mechanism may be that the atrophy of the gluteus medius muscle affects the stability of the hip joint,leading to external displacement of the femoral head,and increasing stress and displacement on the surface and necrotic area of the femoral head.

The 2022 Fudan university doctorate academic public health forum hosted by the graduate school of Fudan university， the graduate work department of the party committee of Fudan university， and the school of public health of Fudan university was successfully held on December 10， 2022 in the school of public health of Fudan university. In the early stage， a total of 53 manuscripts from nationwide universities and research institutes were received， and 10 were selected as excellent papers to participate in the forum report. More than 100 teachers and students attended the forum. Focusing on the theme of " Adhering to the original ambition of scientific research to serve the country and practicing the mission of public health youth"， the major contents of the forums included excellent paper reports in the morning and round-table discussion in the afternoon. Experts and students conducted discussions and communications on prevention， control and management of public health emergencies. It is of great benefit for students to uphold the original intention，practice the mission and further improve public health research.

Ferroptosis, as a newly discovered cell death form, has become an attractive target for precision cancer therapy. Several ferroptosis therapy strategies based on nanotechnology have been reported by either increasing intracellular iron levels or by inhibition of glutathione (GSH)-dependent lipid hydroperoxidase glutathione peroxidase 4 (GPX4). However, the strategy by simultaneous iron delivery and GPX4 inhibition has rarely been reported. Herein, novel tumor microenvironments (TME)-activated metal-organic frameworks involving Fe & Cu ions bridged by disulfide bonds with PEGylation (FCSP MOFs) were developed, which would be degraded specifically under the redox TME, simultaneously achieving GSH-depletion induced GPX4 inactivation and releasing Fe ions to produce ROS