Objective The regulation of ornithine decarboxylase (ODC) gene expression and enzyme activity by corticosterone, the main glucocorticoid in rat, during rat liver regeneration induced by partial hepatectomy (PH) was evaluated.Methods Bilateral adrenaleetomies (ADX) and sham-ADX were performed on ether-anesthetized rats 3 days before PH.Corticosterone in sesame oil was injected subcutaneously to adrenalectomied rats. ODC mRNA, ODC protein and enzyme activity were detected by RT-PCR, Western blotting and high performance liquid chromatography (HPLC), respectively. Results The ODC mRNA levels, protein accumulation and enzyme activity were lower in the intact liver compared to the regenerating liver.After PH, mRNA levels were remarkably enhanced in all groups (n=6 in each group) and peaked at 5 hours post-PH. Till 7 hours, the contents in all groups from high to low were ADX group,control group (Sham-ADX group), ADX treated with 10mg/kg and 40mg/kg body weight corticosterone group, respectively. ODC protein accumulation in ADX rats was higher than that in control rats (n=13, the same below), but it decreasod in corticosterone-treated (10mg/kg) rats until 24 hours post-PH, with a strong decline seen in 40mg/kg corticosterone-treated rats. ODC activity was rapidly promoted, and the highest levels were observed at 6 hours after PH in all groups (n=6 in each group). After corticosterone treatment, the activities declined significantly at 6 hours post-PH, with the lowest value found in the 40mg/kg group. Conclusion Corticosterone treatment results in dose-dependent decreases in ODC mRNA and enzyme protein both in the intact liver and the regenerating liver. The change in ODC activity is partially related to alterations of ODC mRNA and protein accumulation.

Child ; Chondrosarcoma, Mesenchymal ; diagnosis ; drug therapy ; pathology ; Diagnosis, Differential ; Humans ; Male ; Pelvic Neoplasms ; diagnosis ; drug therapy ; pathology ; Tomography, X-Ray Computed ; Treatment Outcome

OBJECTIVE To strengthen occupational safety and health(OSH) management of medical service. METHODS To analyze actuality of OSH management and internal and international laws and regulations for OSH management,and give the proposition of its construction. RESULTS On the basis of the requirement,a set of OSH management scheme was established. CONCLUSIONS It is imperative that construct occupational safety and health management laws and regulations and system in medical service.They are pacing factors for physical and mental health of medical members.

OBJECTIVE To select applicable air disinfectors that can be used at indoor dynamic state to disinfect air in hospital.METHODS Some different air disinfectors were installed different volumetric rooms.To detect indoor air bacterial content before and after running the air disinfectors at quiet state and dynamic state.To evaluate the disinfection effect of these air disinfectors according to the eliminateion rates.RESULTS At quiet state,the indoor bacteria eliminateion rate exceed 90% after the air disinfectors running 0.5h.So the disinfection were qualified.At dynamic state,these air disinfectors showed good lasting disinfection effect.CONCLUSIONS The air disinfectors solve the problem of indoor air disinfection at dynamic state.It is imperative that select and use exactly the air(disinfectors) to get good disinfection effect.

Objective To observe the effect of transcranial low frequency electrical stimulation on the contents of monoamines in ischemic area of rats with middle cerebral artery occlusion(MCAO).MethodsPermanent MCAO model of Wistar rat was established with silk thread enveloped with polyammoniacum.The ischemic areas received various intensity of transcranial low frequency electrical stimulation for 1 hour in rats underwent 1 hour of ischemia.Then the affected tissue was processed with fluorospectrophotometry to determine the contents of dopamine(DA),noradrenalin(NE) and 5-hydroxytryptamine(5-HT).ResultsCompared with the sham-operation group,the contents of DA,NE and 5-HT in ischemic area of MCAO model rats decreased obviously(all P<0.01),while all three monoamines investigated in the sham-operation group with transcranial low frequency electrical stimulation had no significant change.In the MCAO groups stimulating with lower(10 V) and middle(30 V) intensity transcranial low frequency electrical field,the contents of DA,NE and 5-HT in ischemic area had no significant increase.But in the MCAO group stimulating with high(50 V) intensity transcranial low frequency electrical field,the contents of DA,NE and 5-HT in ischemic area increased significantly(P<0.05).ConclusionSome degree of intensity transcranial low frequency electrical field stimulation can increase the contents of DA,NE and 5-HT in ischemic area of rats subjected to MCAO.

Objective To study the feasibility of TNF-α promoting migration of rat mesenchymal stem cells (MSCs) to local damaged tissues. Methods The MSCs was exposed to TNF-α at different concentrations and the expression rate of surface adheslon molecules and specific markers as well as their adhesion to endothelial cells were detected.Based on the above steps,the MSCs stimulated with the optimal concentration of TNF-α were obtained and were injected intravenously to the rats whose hindlimbs experienced ischemia damage.The rats were executed for achieving the muscle samples in the ischemic area,which were made into frozen section to count the number of MSCs. Results ( 1 ) Twenty-four hours after the TNF-o stimulation,the expression of adhesion molecule (VCAM-1) of MSCs increased in a concentration-dependent manner,while the expression of adhesion molecules (ICAM-1,L-Selectin and VLA4) of MSCs showed no significant changes.Besides,the expression rate of specific markers of MSCs was also obscure.(2) Exposed to 10 ng/ml TNF-o,MSCs presented an obviously increased ability in adhesion to the endothelial cells.(3) MSCs stimulated with 10 ng/ml TNF-α showed a larger number in the ischemia-damaged tissue of rat hindlimbs than that in the control group. Conclusion TNF-α at concentration of 10 ng/ml is effective within a short term in increasing VCAM-1 expression in rat MSCs and promoting the adhesion of MSCs to endothelial cells without affecting their character.

Objective To investigate the effect of stromal cell-derived factor-1α( SDF-1α) and interleukin ( IL-1β) on inducing vascular endothelial cells to express lymphatic phenotype .Methods The CRL-1730 cell line was cultured and treated with SDF-1αor IL-1β.The expression of endothelial cell markers and lymphatic endothelial cell markers were investigated with Real-time PCR, Western blotting and immunocytochemistry .Results In CRL-1730 cell line, endothelial cell markers such as voln willebrand factor ( vWF ) , VE-cadherin , vascular endothelial growth factor receptor(VEGFR)2, were dose dependently down-regulated after SDF-1αstimulation, while lymphatic phenotypes such as Prox-1, podoplanin and lymphatic vessel endothelial hyaluronan receptor-1(LYVE-1), were dose-dependently up-regulated after SDF-1αstimulation.The changes of vWF, VEGFR2 and podoplanin, Prox-1, LYVE-1 expression after IL-1βstimulation was similar to that after SDF-1αwhile expression of VE-cadherin changed slightly .Conclusion SDF-1αand IL-1βare able to induce vascular endothelial cell expressing lymphatic phenotype .

Objective To compare the short-term efficacy and adverse effects of docetaxe or oxaliplatin combined with capecitabine in the treatment of late-staged gastric cancer in aged patients. Methods Eighty-two aged patients with late-staged gastric cancer were randomly divided into two groups,of which 38 patients were treated group) ,and 44 patients were treated with oxaliplatin (100 mg/m2 ivgtt on 1st day) and eapecitabine (2000 mg/1 cycle). Results There is no failure of follow-up. In the docetaxe group,the effective rate was 52.63% (20/38) and 54.55 % (24/44) for the docetaxe and oxaliplatin group,respectively (P>0.05). The median progression-free survival(PFS) in the docetaxe group (6.1 months) was similar to that in the oxaliplatin group (6.3 months) (P>0.05). Gastrointestinal response,myelosuppression and neurotoxicity (Ⅰ or Ⅱ level) were the most common ad-verse effects observed in both groups (P>0.05). No chemotherapy-related death was observed. Conclusions The short-term efficacy of decetaxe or oxaliplatin combined with capecitabine in the treatment of late-staged gastric cancer in aged patients is similar,and the adverse effects are all within tolerance limits.

A series of receptors expressed in the surface of tumor cells, which are able to mediate internalizing effect by specially connecting with corresponding ligands. These receptors are potential targets for drugs combined with conjugates. So the drug-conjugate compounds can be targeted delivery to tumor cells. The folate receptor is a promising target because of its marrow tissue specificity, its overexpression in malignant tissues, especially in myeloid leukemic cells, and its ability to bind and internalize folic acid conjugates. It is a promising potential method to apply folate receptor in the receptor-mediated targeting therapy of leukemic cells. In this review, the biological features of folate receptor, its chromosome location and its interaction with ligands, the distribution characteristics of folate receptor in normal and tumor tissues, especially in myeloid leukemic cells, and progress of research on folate receptor mediated targeting tumor cells, especially leukemic cells were summarized.
Antineoplastic Agents ; administration & dosage ; Carrier Proteins ; metabolism ; Drug Delivery Systems ; methods ; Folate Receptors, GPI-Anchored ; Folic Acid ; metabolism ; Humans ; Leukemia ; drug therapy ; metabolism ; pathology ; Receptors, Cell Surface ; metabolism ; Tretinoin ; administration & dosage ; Tumor Cells, Cultured

To determine the relationship between the intercellular adhesion operon (ica) and the biofilm production in Staphylococcus epidennidis isolates from nosocomial infection, and the affection of ica on the antibiotic susceptibility of the isolates, we collected 106 strains, epidermidis isolates from nosocomial infection specimen to detect their biofilm production by quantitative and qualitative method and investigate the existence of ica operon by PCR. The minimal inhibitory concentration (MIC) to erythromycin, ampicillin, cefoxitin, ceftriaxone, teco-planin, ciprofloxacin, tetracycline, trimethoprim-sulfamethoxazole and vancomycin were tested. Among the isolates, 33 (31. 1% ) of them were detected out carrying ica operon. The rate of biofilm production of the ica-posi-tive isolates was higher than that of the ica-negative (P =0. 001) . By adding glucose and NaCl into the culture the detection rate of biofilm production could be increased. The antibiotic susceptibility of the plankton cells of ica-positive isolates to erythromycin, cefoxitin and ceftriaxone , except ampicillin, ciprofloxacin, tetracycline and tremethoprim-sulfamethoxazole, were lower than those of ica-negative isolates. This study showed that the existence of ica operon was close related to the biofilm formation in 5. epidermidis isolates from nosocomial infection. However, the mechanism of antibiotic resistance of the strains inside the biofilm still needed to be illustrated.