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BACKGROUND:Kartogenin can induce chondrogenic differentiation of mesenchymal stem cel s as reported in in vitro experiments. The discovery of Kartogenin finds a novel path to cartilage repair, and it is expected to develop into a new drug to treat osteoarthritis. OBJECTIVE:To observe the inductive role of Kartogenin in the process of human bone marrow mesenchymal stem cel s differentiating into chondrocytes in vitro. METHODS:In vitro cultured human bone marrow mesenchymal stem cel s were grown to the logarithmic phase, and then divided into control group (0μmol/L Kartogenin), 1μmol/L Kartogenin group, and 10μmol/L Kartogenin group. After 72 hours of culture, cel proliferation and differentiation were observed microscopical y. Matrix metal oproteinase 2 and type II col agen levels in the cel supernatant were detected by enzyme linked immunosorbent assay and immunofluorescence staining, respectively. RESULTS AND CONCLUSION:Under the microscope, Kartogenin was shown to significantly promote the proliferation and differentiation of human bone marrow mesenchymal stem cel s. With the increase of Kartogenin concentrations, the level of type II col agen was increased, while the level of matrix metal oproteinase 2 was decreased. These findings indicate that Kartogenin can induce human bone marrow mesenchymal stem cel s to differentiate into chondrocytes, and with the increase of Kartogenin concentration, destruction of the cartilage extracel ular matrix may be inhibited.
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Neutrophils play a critical role in ventilation-induced lung injury. This study was aimed to investigate the characteristics of neutrophils influx in lungs induced by high tidal volume ventilation. Anaesthetized rats were randomly divided into low tidal volume ventilation group (Vt: 7 mL/kg, LV group) or high tidal volume ventilation group (Vt: 42 mL/kg, HV group) (n=40 in each). Rats in each group were ventilated for 0, 60, 90, 120 and 240 min. The wet/dry lung weight ratio (W/D) was measured. The levels of macrophage inflammatory protein-2 (MIP-2) and tumor necrosis factor-α (TNF-α), and the activity of myeloperoxidase (MPO) were detected by enzyme-linked immunosorbent assay (ELISA). The number of neutrophils in bronchoalveolar lavage fluid (BALF) was counted after Wright's staining, and the percentage of netrophils in lung tissues calculated. Histopatholgical examination was used to observe the changes of lung tissues after different ventilations. The results showed that the W/D weight ratio was increased, and the levels of MIP-2 and TNF-α significantly enhanced in HV group at 90, 120 and 240 min. Neutrophils in BALF and the neutrophil percentage in lung tissues were also elevated at 120 and 240 min, which coincided with the enhanced activity of MPO in HV group. The lung injury was significantly related with the ventilation time and the infiltration of neutrophils in lungs in HV group. In conclusion, in ventilation-induced lung injury, neutrophil infiltration is present in a time-dependent manner and associated with the aggravated lung injury. Pulmonary structural damage may be the main reason for ventilation-induced lung injury.
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Neutrophils play a critical role in ventilation-induced lung injury. This study was aimed to investigate the characteristics of neutrophils influx in lungs induced by high tidal volume ventilation. Anaesthetized rats were randomly divided into low tidal volume ventilation group (Vt: 7 mL/kg, LV group) or high tidal volume ventilation group (Vt: 42 mL/kg, HV group) (n=40 in each). Rats in each group were ventilated for 0, 60, 90, 120 and 240 min. The wet/dry lung weight ratio (W/D) was measured. The levels of macrophage inflammatory protein-2 (MIP-2) and tumor necrosis factor-α (TNF-α), and the activity of myeloperoxidase (MPO) were detected by enzyme-linked immunosorbent assay (ELISA). The number of neutrophils in bronchoalveolar lavage fluid (BALF) was counted after Wright's staining, and the percentage of netrophils in lung tissues calculated. Histopatholgical examination was used to observe the changes of lung tissues after different ventilations. The results showed that the W/D weight ratio was increased, and the levels of MIP-2 and TNF-α significantly enhanced in HV group at 90, 120 and 240 min. Neutrophils in BALF and the neutrophil percentage in lung tissues were also elevated at 120 and 240 min, which coincided with the enhanced activity of MPO in HV group. The lung injury was significantly related with the ventilation time and the infiltration of neutrophils in lungs in HV group. In conclusion, in ventilation-induced lung injury, neutrophil infiltration is present in a time-dependent manner and associated with the aggravated lung injury. Pulmonary structural damage may be the main reason for ventilation-induced lung injury.
Subject(s)
Animals , Male , Rats , Lung , Lung Injury , Neutrophil Infiltration , Physiology , Neutrophils , Physiology , Rats, Sprague-DawleyABSTRACT
Objective To evaluate the efficacy of sufentanil combined with propofol for video-assisted endoscopic transthoracic sympathectomy.Methods Twenty ASA I or II patients of both sexes aged 17-40 yr weighing 52-75 kg undergoing video-assisted endoscopic transthoracic sympathectomy were enrolled in this study.Anesthesia was induced with propofol 2.0-2.5 mg/kg and sufentanil 0.5 μg/kg.Tracheal intubation was facilitated with atracurium 0.6 mg/kg.The patients were mechanically ventilated (VT=8-10 ml/kg,RR=10-12 bpm,I:E =1:2,FiO2=80%).Anesthesia was maintained with infusion of propofol 2-4 mg·kg-1·h-1 and sufentsnil 0.2-0.3/.μg·kg-1 h-1 and intermittent iv boluses of atracurium.At the 30 rain before the end of operation propofol infusion was reduced to 1-2 mg.kg-1·h-1 and sufentanil infusion to 0.1 μg·kg-1 h-1 .BP (SP,DP) and HR were recorded and venous blood samples were taken before induction of anesthesia (baseline),at tracheal intubation at the moment of CO2 insnfflation 10 min and 30 min after CO2 insufflation,5 min after deflation and at extubation for determination of plasma corticesteroid,aldosterone and glucose levels.The duration from termination of infusion of the anesthetics to recovery of spontaneous breathing,eye opening at command and tracheal extubation were recorded.Results SP,DP and HR were within the normal range.Plasma levels of comcesteroid,aldosterone and blood glucose were significantly increased during operation as compared with the baseline values.The duration from termination of infusion of the anesthetics to recovery of spontaneous breathing,eye opening at command and tracheal extubation were4.5±1.9,6.4±2.7 and (12.6±1.5)min respectively.Conclusion Sufentanil 0.1-0.3 μ·kg-1·h-1 combined with propofol 1-4 mg·kg-1.h-1 can inhibit stress response during video-assisted endoscopic transthoracic sympathectomy with stable hemodynamics.
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To evaluate the validity of osteoarthritis model induced by bilateral ovariectomy in guinea pig, 32-month-old female guinea pigs were randomly divided into two groups: a sham operation group (control group) and an ovariectomized group (OVX group). The animals were killed 6 or 12 weeks after the operation and the degeneration of the knees were assessed microscopically and histologically by scanning electron microscope (SEM), transmission electron microscope (TEM) and light microscope. The serum levels of estrogen and gestone were detected by immune contest assay. The scoring of articular cartilage histopathology of tibial plateau was performed by histopathological examination. The blood serum levels of estrogen and gestone were decreased significantly in the OVX group as compared with the control group 6 or 12 weeks after the operation. Joint cartilage degeneration as detected by SEM and TEM could be found at the 6th week, but severe degenerative lesions were observed at the 12th week in the OVX group as compared with the control group (P<0.01). The histopathological score of articular cartilage in tibial plateau in OVX group was higher than that of control group, which was coincident with the changes of estrogen and the ultrastructure (P<0.01). The findings suggested that bilateral ovariectomy in guinea pig can induce the severe osteoarthritis that is similar to the aging-induced OA in human. Therefore, the model of the osteoarthritis by bilateral ovariectomy in guinea pig in this study is valid.
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To evaluate the validity of osteoarthritis model induced by bilateral ovariectomy in guinea pig, 32-month-old female guinea pigs were randomly divided into two groups: a sham operation group (control group) and an ovariectomized group (OVX group). The animals were killed 6 or 12 weeks after the operation and the degeneration of the knees were assessed microscopically and histologically by scanning electron microscope (SEM), transmission electron microscope (TEM) and light microscope. The serum levels of estrogen and gestone were detected by immune contest assay.The scoring of articular cartilage histopathology of tibial plateau was performed by histopathological examination. The blood serum levels of estrogen and gestone were decreased significantly in the OVX group as compared with the control group 6 or 12 weeks after the operation. Joint cartilage degeneration as detected by SEM and TEM could be found at the 6th week, but severe degenerative lesions were observed at the 12th week in the OVX group as compared with the control group (P＜0.01).The histopathological score of articular cartilage in tibial plateau in OVX group was higher than that of control group, which was coincident with the changes of estrogen and the ultrastructure (P＜0.01).The findings suggested that bilateral ovariectomy in guinea pig can induce the severe osteoarthritis that is similar to the aging-induced OA in human. Therefore, the model of the osteoarthritis by bilateral ovariectomy in guinea pig in this study is valid.
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To investigate the estrogen receptor (ER) expression in cartilage cell in the development of osteoarthritis induced by bilateral ovariectomy in guinea pig and to find their relationship. 30 two-month-old female guinea pigs were randomly divided into two groups (n = 15 each): sham operation (control) group and ovariectomized group (OVX); Scanning electorne microscope (SEM) and transmission electron microscope (TEM) were obtained to analysis the cartilage degeneration of the hind limb knee joint after 6 and 12 weeks of ovariectomy. Dextran-Coated-Charcoal (DCC) was taken to quantitively detect the expression of ER. The serum levels of estrogen and gestone were detected by immune contest assay. The results showed that ER do exist in the cartilages of the guinea pigs, with higher expression in the control group than in OVX group at the same time point (P < 0.05). It was increased also at 12 th week after operation than that of preoperation. The blood serum levels of estrogen and gestone showed a similar tendency to the expression of ER. Joint cartilage degeneration detected by SEM and TEM could be found at 6 th week, but severe degenerative lesions at 12 th week in the OVX group compared with the control group (P < 0.01). The data suggested that bilateral ovariectomy in guinea pig lead to severe osteoarthritis which mighgt be related to the lower serum level of estrogen and the downregulation of the expression of ER in the cartilage also.
Subject(s)
Cartilage, Articular/cytology , Cartilage, Articular/metabolism , Chondrocytes/metabolism , Estrogens/blood , Osteoarthritis/etiology , Osteoarthritis/metabolism , Ovariectomy , Random Allocation , Receptors, Estrogen/biosynthesis , Receptors, Estrogen/geneticsABSTRACT
To investigate the estrogen receptor(ER) expression in cartilage cell in the development of osteoarthritis induced by bilateral ovariectomy in guinea pig and to find their relationship. 30two-month-old female guinea pigs were randomly divided into two groups (n= 15 each): sham operation (control)group and ovariectomized group (OVX); Scanning electorne microscope (SEM) and transmission electron microscope (TEM) were obtained to analysis the cartilage degeneration of the hind limb knee joint after 6 and 12 weeks of ovariectomy. Dextran-Coated Charcoal (DCC) was taken to quantitively detect the expression of ER. The serum levels of estrogen and gestone were deteeted by immune contest assay. The results showed that ER do exist in the cartilages of the guinea pigs, with higher expression in the control group than in OVX group at the same time point (P＜0. 05). It was increased also at 12 th week after operation than that of preoperation. The blood serum levels of estrogen and gestone showed a similar tendency to the expression of ER. Joint cartilage degeneration detected by SEM and TEM could be found at 6 th week, but severe degenerative lesions at 12 th week in the OVX group compared with the control group (P＜0.01). The data suggested that bilateral ovariectomy in guinea pig lead to severe osteoarthritis which mighgt be related to the lower serum level of estrogen and the downregulation of the expression of ER in the cartilage also.
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Objective To evaluate the value of MRI in diagnosis of meniscus tear of knee joint.Methods MRI manifestations of meniscus tear of knee joint were analyzed in 60 cases.Four-grade classification of meniscus injury was suggested according to Stoller's classification.Results Meniscus tear was seen in 65 menisci of 60 patients,including 15 medial tear,40 lateral tear,and 5 cases(n=10) of bilateral tear.Fifteen lateral discoid menisci were found among the 60 cases of meniscus tear.MRI revealed a accuracy of 90.8%.Thirty-nine cases were complicated by ligament injury,bone contusion,effusion of joint,fracture and meniscus cyst.Conclusion MRI can accurately diagnose meniscus tear and its complication.