BACKGROUND:In vitro experiments have confirmed that human umbilical cord mesenchymal stem cells can be induced to differentiate into hepatocyte-like cells, thus which can be considered to function as liver repair.
OBJECTIVE:To observe the therapeutic effect of human umbilical cord mesenchymal stem celltransplantation on acute liver injuries in rats through in vivo animal experiments.
METHODS:Healthy Sprague-Dawley rats were randomly divided into three groups:normal control group without modeling, celltransplantation group, and PBS group. Rat models of acute liver injury were prepared by 10%CCl4-olive oil solution in the celltransplantation and PBS groups which were fol owed by intraperitoneal injection of 0.5 mL human umbilical cord mesenchymal stem cellsuspension and 0.5 mL PBS, respectively.
RESULTS AND CONCLUSION:Hematoxylin-eosin staining showed that pathological changes related to acute liver injury appeared at 24 hours after intraperitoneal injection of CCl 4 . Then, the liver structure recovered at 7 days after celltransplantation, but it did not recover til the 14th day after PBS injection. Compared with the normal control group, serum alanine aminotransferase and aspartate aminotransferase levels were significantly increased in the other two groups (P<0.05-0.01). In the celltransplantation group, the serum alanine aminotransferase and aspartate aminotransferase levels were significantly lower than those in the PBS group at 3 days after treatment (P<0.05-0.01), and recovered normal y after 7 days. cells positive for anti-human nucleoprotein antibody were found in the portal area of liver tissues in the celltransplantation group after 3 days of transplantation, and then cells positive for anti-human albumin antibody appeared after 7 days. These findings indicate that intraperitoneal transplantation of human umbilical cord mesenchymal stem cells can improve liver function and repair injured liver tissues after acute liver injury in rats to some extent.

The DegP protein, functioning as both chaperone and protease, plays a critical role in degrading and removing denatured or damaged proteins in the cellular envelope during heat shock and other stresses. So far, several proteins have been identified as its natural targets. A carboxyle-terminal peptide derived from the PapG pilus, one of the in vivo substrates for DegP, has been shown to activate the protease. Nevertheless, neither the details nor the physiological implications of such activation have been studied. The evidence that DegP undergoes conformational changes upon binding the peptide derived from C-terminal sequence of pilus subunit PapG has been presented. It demonstrated that upon binding this peptide, detectable changes can be observed for both secondary and tertiary structures of DegP, as examined by CD spectroscopy. Gel filtration and dynamic light scattering analysis also revealed that the size of DegP becomes smaller to a minor extent. Moreover, both the hydrophobic surfaces and catalytic sites of DegP were found to expose slightly in the presence of the peptide. Upon peptide binding, a less flexible and more rigid conformation of DegP was obtained as analyzed by fluorescence anisotropy. The physiological implications of these observations for DegP are discussed.

BACKGROUND:The tumor tissue engineering can build an integrated culture model to ful y simulate the in vivo microenvironment of tumor growth, which can be used to study tumor developmental dynamics and related treatment strategies.
OBJECTIVE:To review the three-dimensional culture of tumor cells using tumor engineering technology.
METHODS:PubMed database was retrieved for articles related to tumor engineering, three-dimensional culture of tumor cells, biological scaffold materials and tumor microenvironment published from January 1992 to March 2013.
RESULTS AND CONCLUSION:Three-dimensional culture, because of its reproducible tissue and cellgrowth in vivo, has become an important platform for study of tumor resistance, invasiveness and tumor microenvironment. The three-dimensional culture has showed a trend to gradual y replace the flat culture technique in many fields, and provides a research platform which is very close to in vivo environment. In recent years, with the development of tumor engineering, a variety of new polymer materials have been used in the three-dimensional culture of tumor cells. Three-dimensional culture technology is becoming a hotspot in the field of tumor biology, in which, using a variety of methods and materials, the cells show a growth in the spatial manner to form a biological support or matrix similar to in vivo growth environment. Biomaterials have become the soil on which seed cells can grow wel , and plays an alternative to the extracellular matrix or the matrix of tissues and organs in the tumor engineering. Therefore, the three-dimensional cellculture has been widely used in cancer research, which has become a powerful tool to tumor drug resistance, angiogenesis, cel-cellinteraction, signal transduction, stem cells and other research.

Objective To study the method of development of PHT PB resistant amygdala kindled rats. Methods By examining the effects of the antiepileptic drugs PHT and PB in a group of rapidly kindled rats,the 40 animals with different sensitivity to these drugs were selected. Then using immunohistochemistry method to determinate the expression of PGP in the brain of the rats. Results Using determination of the after discharge threshold for evaluation of PHT′s and PB′s anticonvulsant effects, 6 animals showed no increase in their ADT at repeated test trials with PHT or PB (from PHT PB resistant rats), and 6 animals exhibited reproducible increase in ADT about 100% after injection of PHT or PB (from PHT PB nonresistant rats). The immunohisto chemistry for P glycoprotein showed increased staining in capillary endothelium in the samples from PHT PB resistant rats as compared with staining in PHT PB nonresistant rats,in extensive fields of bilateral cerebral hemispheres ( P

Objective To evaluate the efficacy of surgical retrieval of testicular spermatozoa,and to present the preliminary results of the retrieved testicular spermatozoa used in intracytoplasmic sperm injection (ICSI) for treatment of non obstructive azoospermic infertility. Methods Forty nine cases of non obstructive azoospermia underwent open testicular biopsy and diagnostic testicular sperm extraction (TESE).Those who had sperms in diagnostic TESE underwent ICSI at least 3 months later. Results Sperms were detected in diagnostic TESE in 12 cases (24.9%). The testicular volume,FSH level and testicular pathology did not accurately predict the presence or absence of sperm in testes.Seven (87.5%) of 8 cases had sperm in re TESE, which were used in their ICSI cycles,resulting in 3 clinical pregnancies. Conclusions The diagnostic TESE should be performed to determine the presence or absence of testicular spermatozoa in testicular failure before ICSI,and the surgically retrieved testicular spermatozoa can be adopted in ICSI for treatment of non obstructive azoospermic infertility.

Neurology is a relatively difficult subject in all medical subjects, to which medical students, interns and low qualification residents generally have a kind of fear, called neurophobia. Through such teaching methods as bedside teaching, problem and case oriented group discussions, mini-lectures and net-work communication, and combined with the specific case and imaging data, our teaching and research section helps students consolidate the basic knowledge of neuroanatomy, grasp the physical examination of the nervous system, and cultivate their thinking of positioning and qualitative diagnosis, so as to enable them to achieve better learning effect in the shortest practice time when they are in clinical neurological depart-ment, and help them to overcome neurophobia.

Military hygiene is one of compulsory courses for undergraduates majored in clinical medicine in military colleges. Aiming at the disconnection between theoretical and practical ability in the traditional teaching process and combining with professional features of military hygiene, teaching reform should give priority to curriculum standards, human resource construction, teaching content and method, teaching quality assessment and feedback system. Meanwhile, teaching idea of‘learning to use’ should be strengthened and teaching scheme in line with the actual needs of military health service security work should be put forward in order to provide new ideas for training military health personnel.

Objective To study the single nucleotide polymorphisms (SNP) in 3 sites allele (T189M, R85H, C121W) of SCN1B and the association between gene distribution and epilepsy. Methods All 330 blood samples of refractory (80 cases), non-refractory (100 cases) epilepsy patients and healthy people (150 cases) were collected. Genomic DNA of leucocyte was extracted. SNPs of three sites allele of SCN1B were tested by allele-specific primer-polymerase chain reaction (ASP-PCR).Data were analyzed by SAS 8.1 statistical software. Results Epilepsy group and healthy group had significantly statistical difference in composition of 3 sites allele on single site genotype (x~2=11.19, 11.14 and 6.50, all P < 0.05).There was no statistical significance between refractory and non-refractory epilepsy group. On gene combination, in 27 different combinations of polymorphism, mutation frequency in 3 sites (CT + AG + CG) was highest in epilepsy group (18.40%).The next was one site in CT + GG + CC (16.80%).In healthy group, frequency of non-variant in CC + GG + CC was highest (16.67%), and the next was 2 sites in CT+ AG+CC (13.73%).Thirty-five cases in epilepsy group (28.80%) had 3 sites mutation compared with 10 cases in healthy group (9.71%), and their difference had statistical significance (x~2=12.54, P<0.05).Eighteen cases in refractory epilepsy group (30.51%) had 3 sites mutation compared with 21 cases in non-refractory epilepsy group (28.77%), and the difference had no statistical significance. Fifty cases in epilepsy group (40.00%) had 2 sites mutation compared with 41 cases in healthy group (40.20%), and there was no statistical significance between them; 25 cases in refractory epilepsy group (42.37%) had 2 sites mutation compared with 21 cases in non-refractory epilepsy group (28.71%), and their difference had no statistical significance. Conclusions Mutation, especially multisite mutation of SCN1B is relatively likely to cause epilepsy in human. Gene distribution and combination of three sites allele of SCN1B in refractory epilepsy is close to that in non-refractory epilepsy.

Objective: To observe the clinical efficacy of acupuncture plus patent Chinese medicine in treating post-stroke constipation. ＜br> Methods: Sixty eligible patients with post-stroke constipation were randomized into a treatment group and a control group, 30 in each group. The treatment group was intervened by acupuncture plusMa Zi Ren pill, while the control group was byMa Zi Ren pill alone. The symptoms of constipation were observed before and after intervention. ＜br> Results: After 2-week treatment, the constipation condition was improved in both groups, and the improvement in the treatment group was statistically more significant than that in the control group (P＜0.05); respectively two weeks and a month after the intervention, the treatment group was superior to the control group in comparing the constipation score (P＜0.05). However, acupuncture didn’t show marked effect in improving defecation speed, initial defecation time, and spontaneous discharge frequency. The treatment group had a significantly higher short-term markedly-effective rate compared with the control group (P＜0.05); the long-term therapeutic efficacy of the treatment group was significantly higher than that of the control group (P＜0.05). The adverse events happened in the treatment group were significantly less than those in the control group (P＜0.05). ＜br> Conclusion: Acupuncture at specific acupoints plus patent Chinese medicine can produce a content therapeutic efficacy.

Objective To study the relevance between the level of thyroid hormone and anti‐thyroid peroxidase antibody (TPOAb) during gestation period .Methods From November 2011 to May 2014 ,150 gravidas were chosen as objectives ,and were divided into 2 groups according TPOAb .The clinical feature ,level of thyroid hormone ,pregnancy outcome ,and complication of neo‐phyte between 2 groups were compared .Results In 150 gravidas ,44 were positive in TPOAb and 106 were negative .The age ,ges‐tational weeks and BMI between two groups had no statistical difference(P>0 .05) .At the early and middle pregnancy as well as at the late pregnancy ,the level of thyroid hormone between two groups had statistical difference(P<0 .05);In study group ,the level of thyroid hormone of early and middle pregnancy and that of late pregnancy had statistical difference(P<0 .05) .The rate of unde‐sirable gestational outcome and that of neophyte complication between two groups had statistical difference(P<0 .05) .Conclusion During gestation period ,the TPOAb was significant for the diagnosis of the sub‐clinical hypothyroidism ,as well for prognosis of gravidas .