Objective Based on the result that a gene coding for human HSS had been identified and prokaryotically expressed, this study is aiming to investigate the proliferative and protective effect of recombinant HSS on hepatoma cells. Methods hHSS protein was produced in BL\|21 strain of E.Coli containing pET\|42a vector and purified with His\5Tag affinity chromatography. A various dosages of 80\|400??g/L were administrated into cell culture. The cell proliferation was analyzed by MTT, cell\|count and flow cytometry methods. Furthermore, cellular growth signaling as indexed by phosphorylation of mitogen\|activated protein kinase (MAPK) was determined with Western blot. In addition to cell growth, protection of hHSS on the cells against H\-2O\-2 was also observed. Results It was showed that recombinaht HSS of 400??g/L was able to promote DNA synthesis by 21\^5% as compared to non\|treated cells. After 24?h of HSS action, the cell division measured by MTT method as well as cell\|count was significantly enhanced. Meantime, it was indicated that the phosphorylation of MAPK Thr202/Tyr204 was increased in 79\^0% as compared with that of the non\|treated cells. Pretreatment of the cells with hHSS for 12?h prior to H 2O 2 injury preserved the survival of them.Conclusion It is postulated that hHSS is an active protein to stimulate liver proliferation. [

G protein- coupled receptors (GPCRs), also known as seven- transmembrane domain receptors, constitute the largest superfamily of cell surface receptors. By coupling to heterotrimeric G proteins, arrestins and other signaling molecules, GPCRs modulate diverse signal transduction pathways under physiological and pathological conditions. Recent studies have revealed crucial roles of GPCRs in tumorigenesis and development of cancer metastasis. This review summarizes roles of GPCRs, particularly the roles of those coupled to chemokines, prostaglandin, lysophosphatidic acid, endothelin, catecholamine and angiotensin in proliferation, invasion, metastasis and angiogenesis of hepatoma cells and development of hepatocellular carcinoma. The potential of GPCRs- based therapeutics being used for hepatocellular carcinoma is also highlighted.

This list of clincal data management documentation is to ensure standardized and adequate archival of trial documents and records in clinical data management, which is applicable to all of phase I-IV clinical trials.

Adult ; Delirium ; chemically induced ; Female ; Humans ; Thiocarbamates ; poisoning

BACKGROUND: As the result of estrogen shortage due to ovariectomy,osteoporosis occursin the general and local bones, displaying bone loss and changes in bone microstructure and growth factor mRNA expression,which definitely has an important effect on fracture healing. OBJECTIVE: To probe into the effect of estrogen on bone microstructure and bone morphogenetic protein-4 mRNA expression and location during fracture healing. DESIGN: Randomized controlled study. SETTING:Laboratory of the Department of Molecular Biology of Yunnan University. MATERIALS: This study was conducted at the laboratory of Molecular Biology Department of Yunnan University between July 1999 and July 2002. We recruited 96 healthy female SD rats of 2 months old and with the mean body mass of 160 to 200 g. METHODS:①Of the 96 rats that received intraperitoneal anesthesia, 48rats were subjected to bilateral ovariectomy(osteoporotic group), and the other 48 rats received sham operation (control group). One month later, bilateral tibia fracture at the middle segment was artificially made on all rats under anesthesia, and no treatment was given so as to prepare fracture healing model. Then rats of both groups were put to death for collecting callus and the surrounding parenchyma at postoperative 1, 3, 5, 7, 14, 28,56 and 112 days, with 6 rats in each time point. ② The tibia bone microstructure was observed under electron microscope. ③ The mRNA expression of bone morphogenetic protein-4 at callus and the surrounding paranchyma was detected by RT-PCR method; no probe in hybrid fluid was used as negative controls. Six in situ hybridization slices with positive expression were selected from both groups at postoperative 1 and 3 days time points, and 3 visual fields were randomly selected from each slice for observing the positive granules under 25 times field lens. MAIN OUTCOME MEASURES: ①The tibia bone microstructure;② bone morphogenetic protein-4 mRNA expression at callus and the surrounding parenchyma. RESULTS: All the 96 rats entered the final results analysis. ① Observation of the tibia bone microstructure: at 28 days after tibia fracture, osseous callus and ostein fibers were found arranged densely in control group. Osteocytes, small with fewer cytoplasts, were observed in osseous lacuna, but osteoclasts were found surrounding small-sized bone trabecula. In osteoporotic group, fibrous callus and collagenous fibers in bone matrix were arranged loosely, lots of big osteoblasts could be observed with osteocytes easily seen. ② Bone morphogenetic protein-4 mRNA expression at callus and the surrounding parenchyma: it was less expressed in control group than in osteoporotic group at postoperative 1 to 3 days (23.714 3±5.056 8,21.714 3±5.023 8 vs 51.285 7±8.138 7,49.571 4±9.071 1, P ＜ 0.01) and the expression was mainly observed in parenchyma surrounding the fracture where callus was formed. CONCLUSION: Bone morphogenetic protein-4 mRNA expression is increased in osteoporotic group and is mainly observed in parenchyma surrounding the fracture, displaying a manner of regional expression. However,the formation and quality of callus matrix during fracture are obviously poorer than in control group.

Constructing internal quality control system is an important measure to improve teaching quality in the universities.Teaching supervision plays an important role in the teaching quality guaranteeing system.This article introduced and summarized the practice of teaching supervision in Tianjin Medical University including the establishment of three-leveled teaching supervision,emphasis of process management,innovation,significance and achievements of teaching supervision.

[Objective]To explore the biomechanical stability of fixation with two and three cannulated compression screws in treatment of the adductive femoral neck fractures by the three-dimensional finite element analysis(FEA).[Method]Two FEA models of two screws and three screws for adductive femoral neck facture fixations were set up to investigate the simulated loading of three different conditions.[Result]At the condition of the heel touching the ground and the middle position,there was no difference in the biomechanical stabilities of the two models.However,at the condition of the tiptoe departing from the groud,the model of three screws fixation was better in torsion resistance and stretching resistance.[Conclusion]The biomechanical stability of fixation with two screws is determined by the direction of loading.Three cannulated compression screws fixation provides better biomechanical stability.

To obtain the criterion of Laser induced Autofluorescence (LIF) spectroscopy in the differentiation of normal lung tissue and lung cancer and study the feasibility of LIF spectroscopy in the diagnosis of lung cancer, the LIF spectra of normal lung and lung cancer in 42 surgical specimens have been measured with a detecting system which consists of an YAG laser(wavelength 355nm) and an optical multichannel analyzer(OMA). Spectroscopic differences between normal lung and cancerous tissues have been found which could be used as a criterion to distinguish from them . The pathological examinations were done to compare with the criterion. The results showed:① The location of the principal spectral peaks of the normal lung tissue (470.8?6.3)nm and lung cancer ( 463.7 ?4.8)nm are different( P

Objective To investigate the relationship between hepatitis B virus pre-core region 1896 site mutation in cases of chronic hepatitis B and IFN-alpha treatment.Methods 200 patients with chronic hepatitis B were randomly divided into experimental group(n=100) and control group(n=100).The patients in experimental group were treated with regular liver-protective drugs and IFN-alpha,while Control group patients received only regular liver-protective drugs for 6 months.PCR-RFLP were used to detect hepatitis B virus(HBV)DNA with pre-C region 1896 site mutation in two grops pre and post treatment.Results The mutation rates before interferon treatment were 20%(20/100) and 18%(18/100) in experimental group and control group,respectly.After treatment,the effective rates in experimental group were 60%(12/20) and 50%(40/80) in Patients with Chronic Hepatitis B variant and wild strain virus Infection,respectly.The effective rate in experimental group was significantly higher than that in control group.Conclusion IFN-alpha therapy was not correlated with genomic variability of the core region.

Our study demonstrated that ARS cells can be induced to differentiate into macrophage-like cells with changes in phenotype, nonspecific esterase activity and phagocytic function by adding ginsenosides in short-term cultures. Synthesis of DNA, mitosis and the growth of the culture cells transplanted in mouse are also inhibited in this condition. The size of cells, nuclei and nucleoli, as well as nuclear-cytoplasmic ratio of ginsenosides treated cells are diminished significantly. Microvilli of these cells are reduced in number with formation of. ruffles on the cell surface. Mitochondria are increased, their size and distribution become regular. The fact that numerous small cells, induced by ginsenosides exhibit the most conspicuous alteration mentioned above along with marked phagocytic activity indicates that they are highly differentiated macrophage-like cells. Whether the inhibition of cell growth and induction of differentiation by ginsenosides is caused through its action on the molecules regulating the gene expression of cell growth and differentiation needs further study.