Kai Deng

Hebei Medical University, Chentow, Hebei, China

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Publications (4)4.81 Total impact

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    ABSTRACT: We explored the expression of phosphatase and tensin homolog deleted on chromosome 10 (PTEN) and focal adhesion kinase (FAK) mRNA and protein, and analyzed the relationship between expression levels and clinical staging and extramedullary infiltration in patients with multiple myeloma (MM). The expression levels of mRNA and protein were measured by fluorescence quantitative polymerase chain reaction (FQ-PCR) and Western blotting. Expressions of PTEN and FAK mRNA were significantly different between patients with MM and controls. Spearman bivariate correlation analysis showed that PTEN mRNA was significantly negatively correlated with FAK mRNA. PTEN and FAK mRNA expressions were significantly different between patients with stage I + II MM and stage III MM. No difference was found in PTEN mRNA expression, whereas FAK mRNA expression was significantly different between patients with MM with and without extramedullary infiltration. PTEN protein was higher and total FAK (T-FAK) protein was significantly lower in six controls than in 12 patients with stage III MM. Phosphorylated FAK (p-FAK) protein was measured as 0.082 ± 0.040 in 11 patients with MM, but not detected in six controls. No significant difference of PTEN and T-FAK protein was found, while p-FAK protein was significantly different between patients with MM with and without extramedullary infiltration. These results indicate that abnormal expression of PTEN and FAK in patients with MM may be associated with disease progression and extramedullary infiltration.
    Leukemia & lymphoma 12/2011; 53(6):1162-8. DOI:10.3109/10428194.2011.647311 · 2.89 Impact Factor
  • Kai Deng · Keliang Zhang · Suyun Wang · Xiurong Li · Hua Zhang · Wei Ma ·
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    ABSTRACT: To study and compare the effect of end-to-end and end-to-side neurorrhaphy between the recipient's musculocutaneous nerve and the donor's ulnar nerve, and to observe the regeneration of peripheral nerve and muscle refection. Sixty male SD rats (weighing 200-250 g) were randomized into 2 groups (n = 30 per group), and made the musculocutaneous nerve injury model. In group A, the donor's nerve was transected for end-to-end neurorrhaphy. In group B, an epineurial window was exposed and the distal end of the muscle branch of musculocutaneous nerve was sutured to the side of the ulnar nerve. Electromyography was performed, biceps wet weight ratio, muscle fiber cross-sectional area, and count of myelinated nerve fiber (CMF) were measured at 4 and 12 weeks postoperatively. The behavior changes of the rats were observed. At 4 weeks, the nerve conduction velocity (NCV) and the latency amplitude (AMP) of group A were significantly higher than those of group B (P < 0.05); at 12 weeks, there was no significant difference in the NCV and AMP between groups A and B (P > 0.05). At 4 and 8 weeks, there was no significant difference in biceps wet weight ratio and muscle fiber cross-sectional area between groups A and B (P > 0.05). At 4 weeks, the CMF was 230.15 +/- 60.25 in group A and 160.73 +/- 48.77 in group B, showing significant difference (P < 0.05); at 12 weeks, it was 380.26 +/- 10.01 in group A and 355.63 +/- 28.51 in group B, showing no significant difference (P > 0.05). Both end-to-end and end-to-side neurorrhaphy have consistent long-term effect in repair of brachial plexus upper trunk injury.
    Zhongguo xiu fu chong jian wai ke za zhi = Zhongguo xiufu chongjian waike zazhi = Chinese journal of reparative and reconstructive surgery 11/2010; 24(11):1302-5.
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    ABSTRACT: We explored the effect of the wild type PTEN gene on the proliferation, apoptosis and invasive ability of multiple myeloma (MM) cells from MM patients and RPMI 8226 cells (a human myeloma cell line), and the effect of the PTEN/focal adhesion kinase (FAK)/MMP signaling pathway on the invasion activity of RPMI 8226 cells. The proliferation of RPMI 8226 cells and purified myeloma cells from MM patients were markedly inhibited after these cells were transfected with recombinant adenovirus-PTEN vectors containing green fluorescent protein (Ad-PTEN-GFP). Maximum growth inhibition of RPMI 8226 cells and purified myeloma cells from MM patients by AD-PTEN-GFP was 42.01 and 24.75%, respectively. After transfection with PTEN-siRNA, the proliferation of RPMI 8226 cells was increased significantly compared with NS-siRNA transfected controls. The maximal survival rate was 141.55 +/- 8.34% in PTEN-siRNA transfected RPMI 8226 cells. Apoptosis of RPMI 8226 cells or purified myeloma cells from MM patients in the Ad-PTEN-GFP group was increased significantly when compared with that in the Ad-GFP (adenovirus vectors only expressing green fluorescent protein) group (p < 0.01). The cell cycle of RPMI 8226 cells was arrested at the G2/M phase. Furthermore, the number of cells that migrated through the matrigel and filter from the upper chamber to the lower chamber in the transwell assay in the Ad-GFP group was significantly larger than that in the Ad-PTEN-GFP group (52.65 +/- 7.39 vs. 23.50 +/- 6.12, p < 0.01). In the PTEN-siRNA group, the cell number (79.50 +/- 11.89) was significantly larger than that in the NS-siRNA group (47.17 +/- 7.76, p < 0.01). When RPMI 8226 cells were transfected with Ad-PTEN-GFP or NS-siRNA, the expression level of PTEN mRNA was up-regulated, and the expression levels of FAK, MMP-2 and MMP-9 mRNA were down-regulated significantly compared with that of the Ad-GFP group and the PTEN-siRNA group (p < 0.01, p < 0.05). The protein levels of FAK and p-FAK, MMP-2 and MMP-9 in RPMI 8226 cells which were transfected with Ad-PTEN-GFP decreased significantly, but increased significantly in PTEN-siRNA transfected RPMI 8226 cells (p < 0.01, p<0.05). These results indicated that wild type PTEN, which inhibited FAK, MMP-2, and MMP-9, could suppress the proliferation and invasion ability of multiple myeloma cells. Modulating the expression of PTEN may be a potential strategy for the treatment of multiple myeloma.
    International journal of hematology 07/2010; 92(1):83-94. DOI:10.1007/s12185-010-0604-y · 1.92 Impact Factor
  • Su-Yun Wang · Zhi-Yong Cheng · Kai Deng · Hao Chen · Lin Pan ·
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    ABSTRACT: Pten gene is the first antioncogene with dual phosphatase activity discovered so far, pten gene regulates the cell cycle progress, apoptosis, metastasis and invasion of the tumor cells through negatively regulating the multiple signaling transduction pathways. Multiple myeloma (MM) is a malignant tumor occurring in terminal stage of B cell differentiation. The genetic changes are considered as the important factors in MM pathogenesis, among which the deletion of antioncogene is a critical genetic change. However, little is known about the genetic change of pten in MM. This review summarizes the research advance on pten in MM including structure of pten, mechanism of pten effect and correlation of pten with MM in order to provide some references for the investigating new gene target to treat the MM.
    Zhongguo shi yan xue ye xue za zhi / Zhongguo bing li sheng li xue hui = Journal of experimental hematology / Chinese Association of Pathophysiology 06/2010; 18(3):816-20.