Migration of Olfactory Ensheathing Cells Transplanted in Normal or Contused Spinal Cord of Rats / 中国康复理论与实践

@#ObjectiveTo explore the migration, effect on axon growth of olfactory ensheathing cells (OECs) transplanted in contused spinal cord of rats. Methods8 adult female rats were induced spinal cord contusion at T10 cord by NYU impactor (H=25 mm), and received OECs transplantation in 1 mm rostral and caudal to injury site，or injury site. Other 4 adult female rats were uncovered the spinal cord at T8-10 cord, and injected GFP+OECs at T10 cord. 1 week after transplantation, all animals were executed and the T8-11 cord (15 mm long) contained the entire injury site were observed for the migration of OECs and immunostained for neurofilament (NF) and myelin basic protein (MBP). ResultsThe OECs injected in injury site largely migrate longitudinally and laterally from the injection site, OECs injected in 1 mm rostral and caudal to injury site of contused spinal cord, migrate longitudinally and laterally from the injection site to the injury site in white and gray matter, and some along the central canal. OECs injected in normal spinal cord migrated longitudinally and laterally from injection site, too. The transplanted OECs expressed a little NF and MBP. ConclusionThe transplanted OECs are able to migrate in spinal cord and promote axon regeneration and remyelination.

Study of blockading Stat3 by transcription factor decoy-ODN inhibiting the proliferation of breast cancer cell line MDA-MB-231 / 中国免疫学杂志

Objective:To investigate the mechanisms of decoy oligodeoxynucleotides(decoy-ODN) blockading Stat3 that inhibit breast cancer cells MDA-MB-231 proliferation.Methods:Stat3 decoy-ODN and scramble control were transfected into breast cell line MDA-MB-231, respectively. The cell proliferation capability was detected by cell counting; flow cytometry was applied to detect MDA-MB-231 cell cycle; FITC labeled decoy was observed by Reflected Light Fluorescence Microscope; the expression of the gene controlled by Stat3 was examined by means of RT-PCR and Western blot assay.Results:Stat3 decoy-ODN could be internalized into MDA-MB-231 cells and inhibit the growth of MDA-MB-231 cell via inducing its apoptosis. Stat3 decoy-ODN also could significantly reduce the expression of Stat3 controlling genes such as Bcl-xl,c-myc and CylinD1.Conclusion:Stat3 decoy-ODN can inhibit breast cell line MDA-MB-231 proliferation by blockading JAK/STAT pathway. This suggests that transcription factor decoy-ODN may serve as a novel therapeutic strategy for breast cancer.