BACKGROUND: With the development of tissue engineering, more attention has been paid to tooth regeneration. However, the resource of best seed cells is still uncertain. Therefore, alternative sources should be attached to intensive investigation. OBJECTIVE: To review the feasibility of stem cells from umbilical cord blood as seed cells for tooth regeneration. METHODS: A PubMed search was performed for articles published between January 1998 and January 2009. Key words were "tooth regeneration, seed cells, tissue engineering, umbilical cord blood, mesenchymal stem cells". Only studies written in English were included. Simultaneously, databases of China National Knowledge Infrastructure, Wanfang, and VIP published between January 1998 and January 2009 were also retrieved, using the key words of "tooth regeneration, seed cells, tissu engineering, umbilical cord blood, mesenchymal stem cells". Only studies written in Chinese were included. Totally, 40 literatures were included. RESULTS AND CONCLUSION: Seed cells, such as odontoblasts from dental germ, stem cells from dental pulp and deciduous teeth, and ectomesenchymal cells from the firstbranchial arch showed odontogenic differentiation potential in basic research. However, these cells are not practical to harvest in clinic. Although bone marrow mesenchymal stem cells have odontogenic capacity, their differentiation abilities significantly decrease with the increasing age of the donors. Stem cells from umbilical cord blood have many clinical advantages over bone marrow mesenchymal stem cells, and exhibited typical mesenchymal stem cells characteristics. Thus, we propose the hypotheses that stem cells from umbilical cord blood could be induced into odontogenic lineage and might be used as suitable seed cells for tooth regeneration to replace the lost tooth.

Objective To study the effect of glucagon-like peptide 2 (GLP-2) on the absorption- related genes [ sodium dependent glucose transporter 1 (SGLT1) and dipeptide transporter 1 (PEPT1)] mRNA expressions of residual small bowel in a rat model of short bowel syndrome. Methods Rats undertaken 75% small bowel resection were randomly assigned into 3 groups: short bowel control (SBC) group, growth hormone (GH) group and GLP-2 group. Another weight-matched normal rats with normal diet was used as normal (NC) group. All rats were given normal chow on the 1st postoperative day (POD). On the 6th POD, partial segment of terminal ileum was harvested to evaluate the mRNA expressions of SGLT1 and PEPT1 by semiquantified reverse transcription polymerase chain reaction. Results The mRNA expressions of both SGLT1 and PEPT1 in SBC group were significantly higher than that of NC group(P0.05). Conclusions A short term GLP-2 adiministration in early postoperative days may has no significant effect on mRNA expressions of SGLT1 and PEPT1 in residual ileum in rats with short bowel syndrome.

Objective: To explore the protections of GLP-Ⅱ pretreatment on mouse intestinal mucosal immunity after ischemia/reperfusion insult. Methods: Thirty ICR mice were randomly divided into three groups: namely normal control (N), control (C) and GLP-Ⅱ pretreatment (P). Group C and group P were inflicted with ligation of superior mesenteric artery for twenty minutes. The morphology of distal ileum mucosa, the rate of intestinal bacteria translocation, the level of plasma endotoxin and intestinal IgA were determined. Results: After ischemia/reperfusion insult, there were obvious damage at distal ileum mucosa in group C and obvious proliferation in group P.The rate of intestinal bacteria translocation and the level of plasma endotoxin were significantly increased (P

Objective To compare pharmacodynamics of vecuronium administered according to body surface area and body weight during general anesthesia.Methods Forty ASA Ⅰ or Ⅱ patients,aged 18-64 yr,weighing 40-85 kg,undergoing general anesthesia,were randomly divided into 2 group ( n =20 each ).The patients received vecuronium 2× ED95 based on body weight (group W) or based on body surface area (group S).Anesthesia was induced with propofol 2 mg/kg,fentanyl 3 μg/kg and vecuronium 0.1 mg/kg ( group W) or 2.824 mg/m2 (group S).The patients was tracheal intubated and mechanically ventilated when the maximal depression of T1 was achieved.PET CO2 was maintained at 35-45 mm Hg and BIS value was maintained at 40-50.The intubation condition was evaluated using Cooper's score.The onset time,maximal depression of T1,duration of clinical action,recovery index,duration of pharmacological action and amount of vecuronium consumed were recorded.The coefficient of variation for all the indexes mentioned above was calculated.Results There was no significant difference in the coefficient of variation for intubation condition,onset time,duration of clinical action,recovery index,and duration of pharmacological action between the two groups ( P ＞ 0.05).Compared with group W,the coefficient of variation for the maximal depression of T1 and amount of vecuronium consumed were significantly decreased in group S ( P ＜ 0.05).Conclusion Vecuronium 2 × ED95 administered according to body surface area can reduce the individual variation in pharmacodynamics during general anesthesia.

Objective To investigate the feasibility and results of the application of both expanded cutaneous flap and temporoparietal fascia flap in total ear reconstruction with Medpor framework.Methods The main procedures consisted of three stages:stage Ⅰ-skin expansion,stage Ⅱ auricle formation that consisted of orientation of Medpor implant and creation of coverage for the implant by both expaned skin flap and temporoparietal fascia flap,and stage Ⅲ-treatment of residual ear and recontruction of auricular lobule. Results Twenty-two ears in 22 unilateral microtia patients were constructed using Medpor implants covered with both expanded cutaneous flap and temporoparietal fascia flap over the last three years,and they were accepted as pleasing by the patients.Conclusions Application of both expanded cutaneous flap and temporoparietal fascia flap can assure no extrusion of Medpor implant in ear reconstruction.Further more,the two layers of transferred tissues will not affect the profile details of the reconstructed ear.And because the skin covering the framework and fascia is derived from frommastoid region,the appearance and profile of the reconstructed auricle is true to nature and close to that of the opposite one.

Gastric cancer incidence is one of the most common malignancies in our country and is the second most common in the worldwide,clinic doctors always emphasize early diagnosis and treatment of gastric cancer patients,in order to reduce the mortality,however,most patients' condition often have been in the late fall and these patients were badly in efficacy.Looking for a new diagnosis way is a medical prddem,with molecular biology advance and gene chips was improved,it is possible for the early screening of gastric cancer.This assay aims to briefly analyse the role of gene chips in the research progress of early gastric cancer.

Multiple cropping has a long history in China, and been used widely in other countries of the world. Be-cause the multiple cropping of medicinal plants (MCMP) partially alleviates land-use contradiction between medici-nal plants and crops, this cropping system is an optimization for cultivation pattern of traditional Chinese medicine (TCM), and important for sustainable development of TCM resources. In this paper, we reviewed the concept, devel-opment history, theoretical basis, and main patterns about MCMP, analyzed the effect of multiple cropping on growth, yield, effective components, pest and disease control of medicinal plants, evaluated the ecological and economic ben-efits of MCMP, and discussed issues and prospects in the research of MCMP. This information can be useful for the medicinal plant cultivators.

Objective To explore the efficacy and safety of sodium nilroprusside(SNP) with remifentanil or fentanyl used for controlled hypotension during the pediatric patent ductus arteriosus (PDA) operations. Methods Sixty children undergoing operation were randomly divided into SNP with fentanyl (A group) or remifentanil (B group). Hemodynamic changes in different times and adverse reactions were observed. Results In B group, heart rate was stable and blood pressure declined quickly. The dose of SNP was fewer and hemodynamic changes and recovery from anesthesia were better in B group than in A group. Conclusion Remifentanil could potentiate the hypotensive effect of SNP and decrease adverse reaction.

Objective To evaluate the treament of central retinal artery occlusion by thrombolysis infusion via super selective ophthalmic artery catheterization.Design Retrospective,observational case series.Participants 21 eyes of 21 patients with CRAO. Methods 21 patients with CRAO were diagnosed by stereoscopic color fundus photography and flouorescein fundus angiography, and were treated by urokinase infusion via super select ophthalmic artery catheterization seldinger technique.Main Outcome Measures Visual acuity and the postoperative complications.Results In the 21 patients,10 had showed the occlusion of ophthalmic arterial trunk by super selective internal carotid artery angiography,the others can be found the appearance of ophthalmic arterial trunk and all patients had undergone thrombolysis therapy successfully.Imaging times of central retinal artery before and after thrombolysis infusion treatment are 38.18?10.86 seconds,12.65?3.30 seconds(t=-11.89,P=0.000).Mean foflow-up time is 3.23?1.26 months.After the treatment,the visual acuity was more than 0.25 in 4 patients,improved to different extent in 9 and remained unchanged in 8. Conclusions Super selective arterial catheterization with thrombolysis for CRAO can improve the visual acuity of the patients,a speedy execution of all internal,neurological,and ophthalmology diagnostic measures;and a prompt therapy are necessary.

Objective: To study the effect of GLP-Ⅱ on residual bowel absorption of glucose in a rat model of short bowel syndrome. Methods: Rats undertaken 75% small bowel resection were randomly assigned to SB group and SB/GLP-Ⅱ group. Another group of weight-matched normal rats(Normal) received normal diet ad libitum was used as control group for SB group. All rats were allowed normal chow on the 1st postoperative day(POD). On the POD6,the intestinal glucose absorption data per unit length as well as per unit weight of ileum were measured by in vivo circulatory perfusion experiment. Results: Length of perfused ileum in 3 groups of rats were not significantly different. Wet weight to length ratio of perfused ileum in SB group was significantly higher than that of normal group,but significantly lower than that of SB/GLP-Ⅱ group. 45min glucose absorption of per cm ileum in SB/GLP-Ⅱ group was significantly higher than that of SB group(P0.05). Conclusions: In a rat model of SBS, GLP-Ⅱ can enhance the intestinal glucose absorption measured as per unit length of resudial ileum and GLP-Ⅱ manifests a trend to increase the glucose absorption measured as per unit wet weight of resudial ileum.