Preparation of porous calcium phosphate microspheres with phosphate-containing molecules at room temperature for drug delivery and osteogenic differentiation

Calcium phosphate (CaP) has similar chemical properties to those of the inorganic component of human bone tissue, for potential application in drug delivery for the chemotherapy of osteosarcoma. In this work, CaP with a porous microsphere structure has been synthesized using fructose-1,6-bisphosphate (FBP) as the phosphorus source by a simple wet-chemical strategy at room temperature. The CaP porous microspheres, as an organic–inorganic hybrid nano-platform, exhibit good doxorubicin (Dox) loading capacity, and Dox-loading CaP, enhancing the in vitro chemotherapy of osteosarcoma cells. The CaP porous microspheres show high biocompatibility, and induce the osteogenic differentiation of MC3T3-E1. These results indicate that the CaP porous microspheres reported in this study are promising for application as an anti-osteosarcoma drug carrier and osteoinductive material for bone regeneration in the treatment of osteosarcoma.

Porous calcium phosphate microspheres were prepared at room temperature, and displayed potential for application in the chemotherapy of osteosarcoma and osteogenic differentiation.     

miR-708-5p通过靶向URGCP抑制非小细胞肺癌A549细胞侵袭、转移的研究

目的 探讨miR-708-5p对非小细胞肺癌A549细胞的增殖、迁移和侵袭的影响及其与上调基因-4(upregulated gene-4/upregulator of cell proliferation,URG4/URGCP)的靶向关系.方法 选取非小细胞肺癌细胞株A549,正常肺成纤维细胞HLF-1为研究对象,根据A549细胞转染物质的不同,分为Control组(未进行任何处理),NC组(转染随机序列RNA Oligo),miR-708-5p组(转染miR-708-5p mimics).MTT检测增殖能力,流式细胞术检测细胞周期,Transwell小室实验检测侵袭能力,划痕实验检测迁移能力,Western blot检测URGCP表达水平;实时荧光定量PCR检测miR-708-5p、URGCP基因mRNA表达水平;荧光素酶实验验证miR-708-5p与URGCP的靶向关系.结果 与HLF-1细胞株相比,肺癌细胞株A549细胞miR-708-5p表达水平降低,URGCP-mRNA表达升高(P<0.05),同时,URGCP蛋白水平升高.转染72h后,与Control、NC组比较,miR-708-5p组细胞URGCP基因mRNA明显降低,URGCP蛋白表达量明显降低(P均<0.01).miR-708-5p组细胞增殖、迁移和侵袭能力明显低于Control、NC组(P<0.05).与WT-URGCP组相比,miR-708-5p+WT-URGCP组细胞荧光素酶活性明显降低(P<0.01).结论 miR-708-5p在非小细胞肺癌A549细胞中低表达,过表达miR-708-5p可抑制A549细胞增殖、迁移和侵袭,机制可能与负性调控URGCP有关.     

Zinc finger of the cerebellum 5 promotes colorectal cancer cell proliferation and cell cycle progression through enhanced CDK1/CDC25c signaling

IntroductionColorectal cancer (CRC), mostly caused by external or environmental factors, is the third most common and lethal cancer worldwide. Although a large number of investigations have been carried out to reveal the evolution of CRC, the underlying mechanisms of CRC remain unclear.Material and methodsExpression of zinc finger of the cerebellum 5 (ZIC5) in CRC tissues and cell models was measured by qRT-PCR and IHC. Cell transfection was carried out for ZIC5 overexpression or knockdown. The MTT assay was applied to examine the capacity of glioma cell proliferation. Wound healing assay and tumor invasion assay were used to test the capacity of glioma cell migration and invasion respectively. Cell cycle analysis and western blot were used to verify the apoptosis rates of CRC cells upon ZIC5 overexpression or downregulation. A further tumor Xenograft study was used to examine the effects of ZIC5 on tumor malignancy in vivo.ResultsCell models using HCT116 and SW620 cells were established to study the ZIC5 function upon ZIC5 overexpression of knockdown. Consistently, we discovered that ZIC5 also significantly increased in Chinese CRC patients. In addition, ZIC5 promoted CRC cell proliferation through increasing the proportion of cells maintained in the S phase. ZIC5 overexpression facilitated the capacity of CRC cell migration and invasion. Inhibition of ZIC5 mitigated such malignant effects.ConclusionsCollectively, investigations of the ZIC5 in CRC provided a new insight into CRC diagnosis, treatment, prognosis and next-step translational therapeutic developments from bench to clinic.     

钛金属内植物表面抗菌肽的应用进展

抗菌肽广泛存在于多种生物体内,是生物体非特异性免疫功能的重要组成部分。其可以保护机体免受细菌、真菌、寄生虫和病毒等病原体的侵袭,还具有介导催化、凋亡、免疫调节活性、促进伤口愈合和促成骨等作用,是钛金属内植物表面抗菌涂层研究的热点,具有良好的应用前景。本文就应用于钛金属内植物表面的抗菌肽的抗菌机制、加载方式和应用现状等进行综述。     

不同方向透明角膜小切口白内障术后对角膜散光的影响

目的探讨不同方向透明角膜小切口白内障术后对角膜散光的影响。方法我科接受透明角膜切口白内障超声乳化吸除联合人工晶状体植入术的患者共34例,按手术切口方向位于角膜曲率最大子午线方向或位于颞上方及鼻上方分为Ⅰ、Ⅱ两组,术后比较角膜散光的变化情况。结果两组患者术后随着时间延长,手术角膜散光度均逐渐减小,差异有统计学意义(P<0.05)。两组患者的角膜散光度均在术后1周时较术前增加最多,但随着时间增加,角膜散光度也逐渐减小。结论采用透明角膜切口超声乳化白内障吸除联合人工晶状体植入术进行白内障治疗前应根据患者的角膜散光情况特异性选择手术切口方向,即在角膜曲率最大处子午线方向做透明角膜切口。     

咪达唑仑片在中国维吾尔族和汉族健康人体的药动学比较

目的研究健康维吾尔族和汉族志愿者单剂量口服咪达唑仑片的药动学。方法维吾尔族、汉族健康志愿者各10名,男、女各半,单剂量口服15 mg咪达唑仑片后,用HPLC法测定咪达唑仑的血浆浓度,运用DAS 2.0程序以非室模型拟合药动学参数,并对药动学参数进行独立样本t检验和非参数Mann-Whitney U test检验,以判断药动学是否存在显著性的民族差异。结果单剂量口服15 mg咪达唑仑片后,维吾尔族志愿者的主要药动学参数分别为:ρmax(124.8±50.0)μg.L-1,tmax(0.8±0.5)h,t1/2z(1.9±0.7)h,MRT0-12 h(2.8±0.8)h,CL/F(0.9±0.4)L.h-1.kg-1,Vz/F(2.3±0.7)L.kg-1和AUC0-12 h(343.2±150.9)μg.h.L-1。汉族健康受试者的主要药动学参数分别为:ρmax(103.1±26.4)μg.L-1,tmax(1.5±0.7)h,t1/2z(3.0±0.8)h,MRT0-12 h(3.6±0.4)h,CL/F(0.7±0.2)L.h-.1kg-1,Vz/F(2.7±0.8)L.kg-1和AUC0-12 h(368.8±103.4)μg.h.L-1。经检验,维吾尔族的tmax、t1/2z和MRT0-12 h比汉族的短,差异有显著性统计学意义,其余参数的民族差异无显著性统计学意义。两个民族的部分受试者的药-时曲线有双峰。结论单剂量口服咪达唑仑片后,汉族和维吾尔族健康志愿者的药动学存在较大的个体差异,且消除速率的民族差异有显著性统计学意义,临床应用时应注意个体化给药。