Hypoxia inducible factor (HIF-1α) is a hypoxia response regulator,which is highly expressed in malignant tumors.Researches have shown that HIF-1α plays an important role in epithelial mesenchymal transformation.It can regulate epithelial mesenchymal transition through a series of signal pathways and mechanisms at many levels,to participate in the invasion and metastasis of tumors.To explore the mechanism of HIF-lα controlling epithelial mesenchymal transformation has important significance for the development of new,effective tumor treatment methods.

Objective[WT5”BZ] To evaluate the role of radionuclide 99m Tc EHIDA for hepatobiliary imaging in rats with orthotopic liver transplantation (OLT) [WT5”HZ]Methods[WT5”BZ] Male SD rats were divided into 2 groups: normal controls (NL, n =10)and normal rats with OLT (NL OLT, n =8). Dynamic scintigraphy using single photon emission computed tomography (SPECT) was used for hepatobiliary imaging. [WT5”HZ] Results[WT5”BZ] The time of peak activity (t max ) and half peak activity(t 1/2 ) in the liver and intestine (GI) imaging time (min) in NL and 6 uncomplicated NL OLT rats were 3 05?0 31 vs. 3 63?0 65 ( P 0 05), respectively. The time active curves and imaging of NL OLT rats were similar to that in NL rats.The t max and t 1/2 in the liver, GI imaging time and the time active curves in 2 complicated NL OLT rats were significantly different compared with that of NL rats. Radionuclide leak occurred in 1 NL OLT rat.[WT5”HZ] Conclusions [WT5”BZ] Radionuclide 99m Tc EHIDA effectively monitors both structural and functional changes of the liver graft. [WT5”HZ]

In vitro construction technology is a key approach to industrialization and clinic application of engineered cartilage. However, it is very difficult to acquire a functional engineered cartilage with the present technology. Bioreactors can simulate the cartilage microenvironment in vivo and are expected to make up the shortcoming of the present technology. Current bioreactors in use are designed according to fluid shear pressure, hydrostatic pressure and/or direct compression, all of which can promote the development and mature of cartilage in vivo. Due to the failure to achieve ideal results by a single-purpose bioreactor, it will become a development direction in future to design and produce a compound bioreactor. This article reviewed the advances in the bioreactor for cartilage tissue engineering.

Objective:In this experiment we used pain-related neurons of Hb unit discharges recording asa standard to observe the effects of prostaglandin E2 (i. p. ) on Hb unit discharges. Methods :The methodsof unit discharges recording and radiant heat induced tail flick responce were used. Results :The dischargesof pain-excited neurons increased after the addition of PGE2 (i. p. ). The discharges of pain-inhibited neu-rons dec reased after the addition of PGE2(i. p. );PGE2(i. p. ) caused the pain threshold to drop after sym-pathetic nerves were destroyed by 6-OHDA. There were no changes of the pain threshold in undestroyedgroup (P＞0.05). The percentage changes of Hb neurons dropped compared with that of undestroyedgroup (P＜0. 05). Conclusion: The PGE2 could change the discharges of pain-related neurons in Hb, inwhich the sympathetic system might participate in the process.

[Abstract ] Objective Cofilin-1 is involved in the pathogenesis of various tumours .However, the expression and effect of Cofilin-1 in hepatocellular carcinoma is not clear .The aim of this study is to observe the Cofilin-1 gene expression in human hepatocel-lular carcinoma (HCC) tissues, and to explore the effect of Cofilin-1 gene expression on invasion and metastasis of HCC HuH-7 cells. Methods Real-time quantitative PCR was used to assess the Cofilin-1 gene expression in human HCC tissues and normal tumor-ad-jacent tissues.The specific small interfering RNA ( siRNA) of Cofilin-1 sequence was synthetized in vitro , and was transfected into HCC HuH-7 cells using liposome transfection.The experiment was divided into Cofilin-1-siRNA group, Ctrl-siRNA group and un-transfected group.Western blot assay was used to detect the protein expression of Cofilin-1.Migration and invasion experiments in vitro were used to investigate the invasive ability of transfected cells. Results Compared with the adjacent liver tissue , Cofilin-1 gene ex-pression in human liver cancer tissue was significantly increased (0.698 ±0.156 vs 3.523 ±0.412, P<0.05).The expression of Cofilin-1 protein in Cofilin-1-siRNA group was 0.558 ±0.033, which was lower than that in Ctrl-siRNA group ( 0.933 ±0.015 )
and in untransfected group (0.961 ±0.020) (P<0.05).The results of migration and invasion experiments in vitro showed that the amount of migration and invasion cells in Cofilin-1-siRNA group were significantly lower than Ctrl-siRNA group or untransfected group (58.50 ±1.78 vs 79.00 ±1.33, 74.50 ±1.35,P<0.05; 36.50 ±0.83 vs 60.20 ±1.60, 51.50 ±1.14, P<0.05). Conclusion Cofilin-1 is highly expressed in HCC, and the invasion and metastasis of HCC HuH-7 cells is suppressed by inhibiting the Cofilin-1 gene expression.

To investigate the effects of catechin on angiotensin-converting enzyme (ACE) activity, angiotensin II(Ang II) content and microvessel density (MVD) in renal tissues of 5/6 nephrectomized rats.

Objective To observe the repairing effect of the acellular nerve allografts on the sciatic nerve gap of rat. Methods The acellular nerve allografts,treated by hypotonic-chemical detergent,were put on the 10 mm gap of the sciatic nerve in the rat.The action potential of the regenerated nerves was determined by the electrophysiologic method 13 weeks after operation.The morphology of the regenerated nerves was observed under light microscope and electron microscope,and the results were analyzed statistically. Results No inflammation and rejected reaction were found in the period of 13 weeks after operation in the operated and control groups.There was no significant difference in number of the regenerated nerve fibers,diameter of the axons,and the thickness of the regenerated myelinated nerve between the experimental group and control group.Conclusion The present results indicated that the acellular nerve allografts had good biocompatibility for the host rat in vivo and might as a bridge promote the regeneration of the injured sciatic nerve.;

Objective The experiment was designed to investigate the effect of acellular nerve allografts on the functional recovery and reconstruction of the nerve-muscle structure of the sciatic nerve defect in rats. Methods Acellular nerve allograft was transferred into the defected rat sciatic nerve with 10mm long.The wet weight of tibialis anterior was weighed at 12 and 24 weeks postoperatively compared with control group.The conducted velocity of regenerated nerve and the effect of regenerated nerve on tibialis anterior were investigated by electrophysiologic test,and silver staining combined with AChE histochemical methods were used in the experiment separately. Results The wet weight of tibialis anterior and the conducted velocity of regenerated nerve in experimental group were similar to those in control group in 12 and 24 weeks after transplantation.The positive acetylcholinesterase(AChE)histochemical reaction was observed in the tibialis anterior at 12 weeks with deeper staining and located in the middle of tibialis anterior tidily at 24 weeks after operation.The regenerated nerve bundles and nerve terminals were found to grow into the motor end-plate of the tibialis anterior in silver staining combined with AChE staining in experiment group.Electromyogram showed that the regenerated nerve has innervated tibialis anterior already.Conclusion The results indicated that extracted nerve allografts as a bridge can promote the motor functional recovery and reconstruction of the nerve-muscle structure of the defected rat sciatic nerve.

Objective To investigate the value of the hippocampal subfield's MRI T2 signal intensity in evaluating the effect of the hydrochloric donepezil for mild cognitive impairment(MCI).Methods 20 MCI patients with hydrochloric donepezil (treatment group) and 20 patients with placebo (control group) were scanned by MRI using FSE-T2 sequence.The margin of hippocampal subfields was outlined manually for each side to measure the MRI T2 signal intensity.The relationship between hippocampal MRI T2 signal intensity and MMSE scores was analyzed in the treatment group.Results Before the treatment, there was no significant difference of the MRI T2 signal intensity between groups.After the treatment, the MRI T2 signal intensity in the bilateral head of the treatment group was significantly decreased compared with the control group(P<0.05).There was an inverse relationship between the MRI T2 signal intensity of the bilateral hippocampal head and MMSE scores in the treatment group(P<0.05).Conclusion The MRI T2 signal intensity in the bilateral hippocampal head could be regarded as a valuable marker in making clinical diagnosis and evaluating the effect of the treatment for MCI in its early stage.

Objective: To study the action of kangfuxin solution on the experimental gastric ulcer.Methods: The rat gastric ulcer models induced by the ligated pylorus and burned acetic acid, the gastric moucosa injury model induced by the absolute ethyl alcohol were used.Results: Kanfuxin solution possessed the protective action on the rat gastric ulcer model induced by the ligated pylorus and rat gastic mucosa injury model induced by the absolute ethyl alcohol, but didn't affect the rat gastric ulcer model induced by burned acetic acid. Conclusion: Kangfuxin Solution also has the actions of inhibiting the output of gastric acid and pepsin.