Hemoprotective Effect of Rotating and Stationary Magnetic Field on Mice Receiving 5-Fluorouracil / 中国康复理论与实践

@#ObjectiveTo study the hemoprotective effects of rotating and stationary magnetic field(RSMF) in mice treated with 5-Fluorouracil(5-FU).MethodsThe BalB/C mice were randomly divided into control group and RSMF-treated group.The mice were injected with 5-FU,the dose were 150,180,210,250 mg/kg respectively. RSMF-treated group was exposed to RSMF for 1 h a time,twice a day during 30 consecutive days,and the magnetic intensity was 0.6 T.The survival rate and survival days during the 30 days were observed.7,10,14,21,28 days after injection,the peripheral blood cells were counted.On day 8,10 and 14,the number of bone marrow mononuclear cells(BMNC) and the forming ability of colony-forming unit-granulocyte/macrophage(CFU-GM) were measured.The pathological section of femur and the expression level of bone morphogenic proteins(BMPs) in bone marrow were evaluated.ResultsRSMF could increase the survival rate and survival days of mice treated with 5-FU,and induce an increase in hemoglobin concentration,white blood cell count(WBC),red blood cell count(RBC) and platelet number.Also,RSMF could increase the number of BMNC and improve the forming ability of CFU-GM on days 8～14.Furthermore,RSMF could improve the bone marrow angiogenesis and the expression level of BMPs.ConclusionRSMF have an obvious protective effect against chemotherapeutic injury,and it can accelerate the recovery of hematopoiesis and hematopoietic microenvironment in mouse bone marrow.

Inhibition of tumor angiogenesis in nude mice by adenovirus-mediated PF4 p17-70 cDNA transfection / 中华血液学杂志

<p><b>OBJECTIVE</b>To investigate the in vivo effect of modified platelet factor 4 (PF4)-p17-70 cDNA on tumor angiogenesis in nude mice.</p><p><b>METHODS</b>The p17-70 cDNA was cloned into the AdEasy system to transfect packing cell line 293 and produce viral particles encoding p17-70cDNA (Ad p17-70). The integration of p17-70 cDNA was confirmed by RT-PCR and the P17-40 peptide Western blot. The biological activity of purified recombinant adenovirus was determined by umbilical veinal endothelial cell proliferation assay in vitro and in vivo tumor angiogenesis suppression of nude mice bearing human head and neck carcinoma.</p><p><b>RESULTS</b>p17-70 significantly inhibited in vitro proliferation of endothelial cells being 58% lower than that of empty vector and reduced tumor volume in vivo. The tumor mass was (0.086 +/- 0.054) g, (0.171 +/- 0.076) g and (0.195 +/- 0.067) g, the tumor volume was (16.7 +/- 5.2) mm(3), (36.5 +/- 23.7) mm(3) and (41.5 +/- 12.2) mm(3) in p17-70 cDNA transfected group, empty vector group and PBS group, respectively. Immunohistochemical staining demonstrated a decreased number of blood vessels in the tumors.</p><p><b>CONCLUSION</b>P17-70 peptide mediated by adenoviral vector could inhibit the endothelial proliferation in vitro and the tumor growth in vivo.</p>

The hemoprotective effects of a rotary magnetic field in mice exposed to?irradiation / 中华物理医学与康复杂志

Objective To study the hemoprotective effects of a rotary magnetic field(RMF)with radiation- injured mice.Methods C57 BL6/J mice were randomly divided into a control group and a magnetic treatment group.The mice received total body irradiation with 7.0 Gy and 6.5 Gy ~(137)Cs?rays.The treatment group was trea- ted with a RMF for one hour at a time,twice a day.The intensity of the RMF was 0.6T.The survival rate was ob- served for 30 days.On day 7,10,14,21,28 after irradiation,the subjects' peripheral blood cells were counted.On day 12 and 16,the number of bone marrow mononuelear cells(BMNCs)was measured and their ability to form granu- locyte-macruphage colony-forming unit(CFU-GM)was assessed.The pathological sectioning of the femur was per- formed and the expression level of bone morphogenetic proteins(BMPs)in the bone marrow were evaluated.Re- sults The RMF treatment increased the survival rate and duration among the irradiated mice and the number of blood cells in their peripheral blood.Also,RMF treatment could increase the number of BMNCs and improve their ability to form CFU-GM on days 12-16.Furthermore,RMF could improve angiogenesis and the expression level of BMPs. Conclusion The RMF treatment had an obvious protective effect against the effects of irradiation,and it accelerated the recovery of hematopoiesis and the hematopoietic microenviroment in mouse bone marrow.

The effect of platelet factor 4 on the chemoattract function of the cord blood CD34+ cells / 中国应用生理学杂志

<p><b>AIM</b>To study the effect of PF4 and relative peptide PF4 17-70 on the chemoattract ability, the expression of adhesion molecules and CXCR4 on the flesh cord blood CD34+ cells.</p><p><b>METHODS</b>CD34+ cells were separated from the cord blood using MACS immune magnetic beads, the chemoattract ability was assayed using the Transwell board, the expression of adhesion molecules and CXCR4 was measured by FACS.</p><p><b>RESULTS</b>(1) PF4 and PF4 17-70 increased the migration of the CD34+ cells, the chemoattract percentage of PF4 was 157.43% +/- 50.06% (P < 0.05) and PF4 17-70 was 187.02% +/- 10.69% (P < 0.05). (2) The expression of CD49d and CXCR4 on the CD34+ cells increased after PF4 incubated, but the expressions of other adherent molecules including CD31, CD44, CD11a, CD62p, CD62E did not change.</p><p><b>CONCLUSION</b>PF4 has the chemoattract ability on the umbilical blood CD34+ cells by promoting the expression of integrin CD49d and CXCR4, PF4 may help the cord stem cells homing.</p>