Objective To evaluate the biochemical function of rat nature three-dimensional acellular pancreatic bioscaffold (3D-APB) in promoting cell proliferation and differentiation in vitro.Methods The fresh pancreas from 10 rats were perfused to prepare 3D-APB.The biocompatibility of 3D-APB was eva luated.The experiment was divided into 4 groups based on 4 kinds of three-dimensional media for AR42J culture,including blank control group,ECM group,PLGA group and 3D-APB group.We compared the proliferation and differentiation of AR42J pancreatic acinar cell at 3 days,5 days,7 days and 10 days after seeding among 4 groups.Results The 3D-APB could represent a biocompatible scaffold capable of integrating within host tissue.The proliferation rate of AR42J cells by MTT in 3D-APB was higher,while the apoptosis rate by flow cytometry was lower than those in other 3 media,which were all significantly different (P ＜ 0.05),respectively.The protein expression of PDX-1 and PTF-1 by western blot in 3D-APB group was greatly higher than those in other 3 groups (both P ＜ 0.05).The mRNA expression of PDX-1 and PTF-1 through qRT-PCR was significantly higher than those in other 3 groups (both P ＜ 0.05).Conclusion Compared with the commonly used chemical and natural scaffold at present,3D-APB could promote cell proliferation and differentiation,which was more appropriate for regenerative medicine.

BACKGROUND: In alveolar cleft patients, the amount of bone stock after alveolar bone grafting is mostly measured and analyzed by two-dimensional imaging, which can result in a large error. OBJECTIVE: To evaluate the 6-month osteogenesis of alveolar bone graft in alveolar cleft patients using cone beam CT. METHODS:Alveolar bone grafting was performed in 25 patients with unilateral complete alveolar cleft. The patients were folowed up for 6 months after surgery and the osteogenesis of the bone graft was evaluated by CBCT. RESULTS AND CONCLUSION:After the surgery, the labial bone support was better than the palatal one. There were significant differences in the alveolar bone thickness of the cleft region and the normal region of the central incisor as wel as the alveolar bone thickness of the cleft region and the normal region of the canine tooth 0 mm distant to the alveolar crest. These findings indicate that the palatal bone support is less than the labial one, and the bone support of the central incisor is not satisfactory, which provide the basis for the tooth movement in the alveolar bone grafting and the orthodontics treatment.

Aim To investigate the effect of bufalin on proliferation and expression of WT1 in K562 cells. Methods The colony number of K562 cell was detec-ted with semi-solid culture assay. The cell cycle was measured by flowcytometry, and the expression of WT1 was observed with immunocytochemistry. Subcutaneous tumor models established by K562 cells in BALB/C nu/nu mice were divided into three groups, including model group, bufalin group and positive control group. After 21 days, the subcutaneous tumors were removed for calculating the inhibitory rate of tumor growth. HE staining and immunohistochemistry were used to ob-serve the morphological changes and the expression of WT1 . Results ① Bufalin could significantly decrease the colony number of K562 cell, arrest it at G0/G1 phase and down-regulate its expression of WT1 in a dose-dependent manner. ② Compared with the model group, the tumor inhibitory rate was much higher, while the volume and the weight were obviously lower in the other two groups. ③Bufalin could induce apop-tosis, necrosis, hemorrhage and fibrosis with HE stai-ning, and down-regulate the expression of WT1. Con-clusion Bufalin could inhibit the proliferation, arrest the cell cycle at G0/G1 phase and down-regulate the expression of WT1 in vitro. Bufalin could inhibit the tumor inhibitory rate, the volume and the weight of the subcutaneous tumors, induce apoptosis, necrosis, hemorrhage and fibrosis with HE staining and down-regulate the expression of WT1 .

BACKGROUND:Cartilage injury is stil one of the clinical problems difficult to be treated completely so far. Recently, the discovery of synovial mesenchymal stem cells (SMSCs) has brought about the new hope to cartilage repair.
OBJECTIVE:To explore the process concerning SMSCs-based therapy for cartilage repair in the past few years, such as the characteristics of SMSCs, culture conditions, preclinical and clinical studies, and then to summarize the literatures published in recent years.
METHODS:A computed-based online search of PubMed and SpringerLink databases was performed using the key words of“synovial mesenchymal stem cells, cartilage repair”for literatures published from January 1993 to May 2013.
RESULTS AND CONCLUSION:Final y, 37 articles were included. SMSCs have a greater proliferative capability, colony-forming potential and chondrogenic potential than other mesenchymal stem cells. The diseases such as osteoarthritis and rheumatoid arthritis can influence the characteristics of SMSCs. Numerous articles have aimed at the studies of cellculture in vitro and celltransplantation in vivo. However, the process of SMSCs therapy is mostly at its preliminary stage. Reports on its unique characteristics, optimal culture conditions and the high-quality clinical studies are stil largely lacking. In a word, though further studies are needed, SMSCs appear to be a promising cellsource for cartilage repair in the future.

BACKGROUND:With the increasing of aging, the incidence and mortality of osteoporotic hip fracture wil rise. It is of great significance to study the pathogenesis and preventing method. At present, finite element analysis can be used to judge fracture, only for the distribution trend of fracture failure in the starting point or section view, but it cannot completely reflect actual situation of fracture. OBJECTIVE:To build the fracture model of the femoral neck fracture caused by fal ing-induced external force based on the finite element analysis LS-DYNA software, and to evaluate the effect of rupture. METHODS:CT image data of one case of elderly femoral neck fracture were col ected. Using Mimics software, region growth of the contralateral area, cavity fil ing, editing, rebuilding the contralateral proximal femur model were conducted. Data were imported in Hypermesh and LS-DYNA software for meshing, and defining material properties. The failure parameters and interfacial properties were set. The load and force boundary constraints simulating the fal ing were simulated. The model of femoral neck fracture was calculated. Rupture effect was evaluated. RESULTS AND CONCLUSION:(1) The validity of contralateral proximal femur three-dimensional model was verified. Based on the finite element analysis software LS-DYNA, the femoral neck fracture model matched the actual fracture line to a degree of close to 83%. (2) Above results confirmed that based on the finite element analysis, LS-DYNA software can wel simulate the femoral neck fracture, which provides experimental basis to the exploration of femoral neck fracture classification mechanism caused by different fal ing-induced external forces.

Biomedical Research ; Clustered Regularly Interspaced Short Palindromic Repeats ; Humans

Objective:To explore the application of Tongdu Tiaoshen acupuncture in patients with hemiplegia after stroke.Methods:Randomized controlled trial. A total of 70 patients who met the inclusion criteria for post-stroke hemiplegia in our hospital from January 2020 to December 2021 were divided into two groups, with 35 cases in each group, according to the random number table. The control group was given conventional treatment combined with rehabilitation exercise therapy, and the observation group was given Tongdu Tiaoshen acupuncture on the basis of the above, and both groups were treated continuously for 1 month. Compare of the two groups Fugl-Meyer Assessment (FMA), Modified Ashworth Scale (MAS), National Institutes of Health Stroke Scale (NIHSS), Activity of Daily Living (ADL) score; Brunnstrom stage method was used to assess the patient's motor ability, and Holden walking function grade was used to assess the patient's walking ability. The activated partial thromboplastin time (APTT), prothrombin time (PT), thrombin time(TT), and serum fibrinogen (FIB), D-dimer (D-D), plasminogen activator inhibitor 1 (PAI-1) levels were observed by ELISA. Adverse events were recorded and clinical efficacy was evaluated.Results:The total effective rates of the observation group and the control group were 97.14% (34/35) and 77.14% (27/35), respectively, and the difference between the two groups was statistically significant ( χ2=6.25, P=0.012). After treatment, the scores of FMA and ADL in the observation group were significantly higher than those in the control group ( t values were 9.23 and 9.54, respectively, P<0.01), the MAS and NIHSS scores were significantly lower than those in the control group ( t values were 10.23 and 11.97, respectively, P<0.01). After treatment, the distribution of patients in Brunnstrom stage Ⅴ and Ⅵand Holden functional walking stage Ⅳ and Ⅴ in the observation group was significantly higher than those in the control group ( χ2 values were 11.96 and 11.27, respectively, P<0.05). After treatment, APTT, PT and TT in the observation group were significantly longer than those in the control group ( t values were 10.37, 13.57 and 6.54, respectively, P<0.01); serum FIB, D-D and PAI-1 levels were significantly lower than those in the control group ( t values were 12.85, 11.94 and 27.39, respectively, P<0.01). No adverse reactions occurred in both groups. Conclusion:The treatment of post-stroke hemiplegia with Tongdu Tiaoshen acupuncture can improve the effect of clinical treatment and the ability of daily life, neurological function, limb function, movement and walking ability, and stabilize the clotting state.

Statins inhibit the activity of enzyme 3-hydroxy-3-methyl-acetyl coenzyme A reductase and further inhibit cholesterol synthesis. Statins are the most widely used cholesterol-lowering drugs in clinical practice. Studies have found that statins also play a positive role in periodontitis treatment. In this paper, we reviewed the functions of statins in bone metabolism and anti-inflammation in periodontitis. In addition, the application of statins as a local drug delivery system in the treatment of periodontitis was described.