BACKGROUND:As a material to repair osteochondral defect,the acellular cartilage matdx has attracted more and more researchers'attention,however,there is no comparison between two ways of decelluladzation.OBJECTIVE:To test trypsin and Triton X-100 methods for their potential of cell removal.DESIGN,TIME AND SETTING:Controlled observation was performed at the Central Laboratory of Orthopaedics in the Second Hospital of Shanxi Medical University between March and July in 2008.MATERIALS:Fresh knee and hip articular cartilages of pig were purchased from the market.METHODS:Porcine articular cartilages were treated with either 0.25%trypsin or 0.25% Triton X-100 respectively for decelluladzation,while fresh untreated articular cartilage served as control.MAIN OUTCOME MEASURES:①General observation on the morphology of acellular articular cartilage.②Immunohistochemistry and scanning electron microscopy were used to determine the effect of two decellularization methods on the extracellular matrix collagen.③Ten articular cartilage leaflets in each group were measured for breaking strength and percentage elongation through loading,unloading and breaking tests.RESULTS:①By use of trypsin and Triton X-100 methods,the acellular matrix had no significance difference in the morphology compared with untreated cartilage,only presenting slightly white color and feeling less soft.②lmmunohistochemistry and scanning electron microscopy results showed that,trypsin and Triton X-100 methods achieved complete decelluladzation.Trypsin had no significant influence in extracellular matrix and cartilage leaflets microstructure;Triton X-100 caused some tiny structural alterations,such as more collagen and disordered structure.It is possibly that Triton X-100 damaged extracellular matrix.③No significant difference was identified between untreated and trypsin,Triton X-100 groups in breaking strength and percentage elongation.CONCLUSION:Trypsin and Triton X-100 all achieve complete decellularization.but trypsin uses short time and low costs with well preservation,while Triton X-100 with long procedure and slight damage to collagen structure.They all have no significance influence to the mechanics characteristics of articular cartilage.

Leptin is a kind of energy-modulation hormone expressed by fat tissue. Its receptor has a wide distributing in human body which affects much physiological systems and metabolize access. With the further researches to leptin, its function is not localized fatness and thinness. Leptin is closely associated with the function of gastric mucosa. It attends the pathophysiological course of gastric cancer and gastric -related disease.

0.05);between YMDD mutation and YMDD negative,there was statistical difference(P0.05),between YMDD mutation and YMDD negative, there was significant difference(t=12.76,P

Objective To investigate the sensory-discriminative and affective-motivational pain response of intrathecal injection of m-AIP,a special inhibitor of CaMKII,in a rat model of chronic constriction injury of sciatic nerve(CCI).Methods Eighteen SD rats were divided randomly into 3 groups(n=6):Group S(sham),Group C(control) and Group m-AIP.Group C and m-AIP were operated with the model of neumpathic pain induced by chronic constriction injury of sciatic nerve; Group S were treated as sham operated rats.Seven days after operation,Group S and C received intrathecal injection of 0.9％ NaCI 20 μl,while Group m-AIP received intrathecal injection of m-AIP 0.5 nmol/20 μl.Escape/avoidance behavior refrecting the affective-motivational dimension of pain was measured on 1.5 h after administration.Rats received pain behavior tests including paw withdrawal mechanical threshold(PWMT) and paw withdrawal thermal latency(PWTL) before and 2 h,4 h,8 h after administration.Results Treatment with m-AIP attenuated escape/avoidance behavior and reversed pain behaviors after CCI.At 2h and 4h after administration,Group m-AIP PWTL((1 1.45 ± 2.04)s,(10.26 ± 1.48)s) and PWMT ((21.15 ±4.32)g,(20.45 ±4.09) g) were increased when compared with Group C PWTL((9.63 ± 1.65)s,(9.30 ±0.73)s),PWMT((13.87 ±2.36)g,(14.80 ±3.12)g)(P＜0.05).Before and8 h after administration,Group m-AIP PWTL,PWMT had no significant difference when compared with Group C (P ＞ 0.05).Conclusion CaMKⅡ may play an important role in sensory and affective pain processing in neuropathic rats.Intrathecal injection of m-AIP can effectively improve pain behaviors and attenuate negative affect.

Objective To investigate spatial memory ability of intraperitoneal injection of resveratrol in a mice model of chronic constriction injury of sciatic nerve(CCI).Methods Forty-four C57BL/6 mice were divided randomly into 4 groups:sham group (n=14),CCI group (n=14),resveratrol pre-treatment group (i.p.resveratrol 100 mg/kg 30 minutes before CCI model,n=8) and resveratrol post-treatment group (i.p.resveratrol 100 mg/kg 14 days after CCI model,n =8).CCI group,resveratrol pre-treatment group and resveratrol post-treatment group were operated with the model of neuropathic pain induced by chronic constriction injury of sciatic nerve.In shamoperated controls,an identical surgical procedure was performed,except that the sciatic nerve was not ligated.This was accomplished by using intellicage for mice by newbehavior to record their spatial memory after surgery.Results (l) Resveratrol pre-treatment group showed improved spatial memory ability compared with sham group and CCI group during day 17-21 (17 d:(55.80±7.66) ％,(51.20±7.94) ％ ; 18 d:(60.20±3.89) ％,(49.80±8.61) ％ ; 19 d:(62.20±7.25) ％,(51.20±6.83) ％ ;20 d:(63.00±9.69) ％,(48.40±8.84) ％ ;21 d:(56.80±7.52) ％,(47.20±4.54) ％)(P＜0.05),compared with CCI group.(2)From day 26,the spatial memory damage was observed in mice with CCI (26 d:(37.50±5.50)％,(51.80±9.01)％;27 d:(37.25±4.19)％,(51.20±5.76)％;28 d:(42.25± 3.50) ％,(52.80± 7.52) ％) (P＜ 0.05),compared with sham group.And this damage could be reversed by resveratrol,which was injected when the chronic pain was stable (26 d (46.60± 5.27) ％,27 d (54.00± 7.31) ％,28 d (52.60±4.39)％),compared with CCI group(P＜0.05).Conclusion Chronic constriction injury of sciatic nerve mice due to spatial memory impairment can be improved by resveratrol.

Objective To investigate the changes in the expression of hepatic circadian clock gene in different types of circadian rhythm and the effect of isoflurane anesthesia on the expression of hepatic circadian clwk gene in mice.Methods Seventy-two male C57/B6 mice,aged 2 months,weighing 20-25 g,were randomly divided into 3 groups (n =24 each):normal light/dark (LD) cycle group,reversal LD cycle group and anesthesia group.Normal LD cycle group and anesthesia groupwere maintained in a regular 12 h LD cycle with lights on at 8:00 am and off at 8:00 pm for 3 weeks,and in addition anesthesia was then performed with isoflurane in anesthesia group.Reversal LD cycle group was kept in an inverted12 h LD cycle with lights on at 8:00 pm and off at 8:00 am for 3 weeks.The natural time was converted to circadian time (CT) and the initial time was set at CT0.Isoflurane anesthesia group was exposed to 2％ isoflurane for 6 h during the wakening period from CT14 to CT20.The liver and suprachiasmatic nucleus (SCN) were removed from mice at CT2,CT8,CT14 and CT20 for determination of Clock and Cry1 mRNA expression by real-time quantitative PCR.Results Clock and Cry1 mRNA expression in the liver and SCN showed rhythm in the two different types of circadian rhythm.Compared with that in SCN,the peak phase of Clock and Cry1 mRNA expression in livers was delayed in two different types of circadian rhythm.Isoflurane anesthesia caused a peak phase delay of Cry1 and Clock mRNA expression in livers as compared with normal LD cycle group.Conclusion Circadian clock gene in livers shows rhythmic expression in different types of circadian rhythm,and isoflurane anesthesia can cause a large peak phase delay of circadian clock gene expression in livers of mice.

Objective To explore the efficacy of modified uvula palatopharyngeal plasty in the treatment of obstructive sleep ap-nea syndrome(OSAHS) .Methods 145 cases of OSAHS patients were treated from June 2006 to June 2010 in our hospital ,of which 54 were treated by traditional UPPP surgery ,and the remaining 91 cases were treated by h-UPPP surgery .Compared its effi-cacy by the preoperative and postoperative polysomnography map (PSG) analysis .Results In 145 cases of patients with OSAHS , the PSG monitoring indicators of 1 year after surgery were compared with preoperative ,and there were significant difference in the apnea total time(AI) ,the breathing hypopnea index(AHI) ,the lowest oxygen saturation(SaO2 )(P<0 .05) .The subjective symp-toms in postoperative recovery process of modified UPPP ,such as dry throat ,open nasal ,nasopharyngeal reflux symptoms were sig-nificantly reduced than that of traditional UPPP surgery .Conclusion h-UPPP surgery have a good effect .

In the process of cultivating TCM clinical postgraduates of TCM clinical college in Shanxi university of Chinese medicine,we emphasized the importance of clinical application ability and innovation ability in scientific research,stressed the clinical practice and check management,to formulate the objective,effective and quantified assessment index system in keeping with the real institution of our college,so as to improve the all-round quality of TCM clinical postgraduates.

Objective: To study the influence of negative electrets on apoptosis of fibroblast cells and to probe its mechanism. Methods: Fibroblast cell were treated with -300, -500 and -1 000V PTFE electrets for 24, 48 and 72 h, respectively, and the influence of negative electrets on cell apoptosis was studied by means of flow cytometry and transmission electron microscope. Results: Compared with control group, apoptosis cells increased from 0.5% to 10% (some even to 15%) after 24，48 and 72 h action of -300, -500 and -1 000 V electrets. After action of -500 V PTFE electrets for 48-72 h, fibroblast cells showed characteristic morphological features of apoptosis. These features included chromatin aggregation, nuclear and cytoplasmic condensation and partition of cytoplasm and nucleus into membrane bound-vesicles (apoptotic bodies). The effect of negative electrets on apoptosis was in proportion to the time and electric field intensity. Conclusion: Negative electrets can enhance apoptosis of fibroblast cells.

Objective: To study the influence of electret on surface charge of fibroblast cells (3T3 cells) and to probe the relationship between cell growth, apoptosis and cell surface charge. Methods: Electrets Teflon PTFE, ±300 V,±1 000 V were used to treat 3T3 cells for 24, 48 and 72 h. Then the influences of electrets on cell cycle and surface charge of 3T3 cells were studied by flow cytometry and electrophoresis, respectively. Results: (1) After 24 h action of negative electrets, electrophoretic mobility (or surface charge) and cell number in S phase of 3T3 cells were significantly increased compared with those in control group. (2) Effect of negative electrets enhancing cell growth and increasing cell surface charge was in proportional to the surface potential of electret. (3) Surface charge density of apoptotic cell was reduced by electret. (4) After 24 h action of positive electret, the cell number in S and G2 phase were decreased and cell surface charge was also reduced. Conclusion: Negative electret can improve cell growth and increase cell surface charge density. Positive electret can restrain cell growth and reduce cell surface charge density. Surface charge of apoptotic cell is less than that of normal cell.