Abnormal neurogenesis in the dentate gyrus of adult mice lacking 1,25-dihydroxy vitamin D3 (1,25-(OH)2 D3)

In this study, we employed 1α-hydroxylase knockout (1α-(OH)ase(-/-) ) mice to investigate the influence of 1,25-dihydroxy vitamin D(3) (1,25-(OH)(2) D(3) ) deficiency on the adult neurogenesis in the hippocampal dentate gyrus (DG). The numbers of both 24-hr-old BrdU(+) cells and proliferating cell nuclear antigen positive cells in 8-week-old 1α-(OH)ase(-/-) mice increased approximately twofold compared with wild-type littermates. In contrast, the numbers of 7- and 28-day-old BrdU(+) cells in 1α-(OH)ase(-/-) mice decreased by 50% compared with wild-type mice, while the proportion of BrdU(+) /NeuN(+) cells in BrdU(+) population showed no difference between 1α-(OH)ase(-/-) and wild-type mice. Apoptotic cells in the subgranular zone (SGZ) of DG markedly increased in 1α-(OH)ase(-/-) mice. Replenishment of 1,25-(OH)(2) D(3) , but not correction of serum calcium and phosphorus levels, completely prevented changes in the neurogenesis in 1α-(OH)ase(-/-) mice. The absence of 1,25-(OH)(2) D(3) led to an increase in the expression of L-type voltage-gated calcium channel (L-VGCC) and a decrease in the nerve growth factor (NGF) mRNA level. Treatment with the L-VGCC inhibitor nifedipine blocked the increased cell proliferations by 1,25-(OH)(2) D(3) deficiency. Administration of NGF significantly attenuated the loss of newborn neurons in 1α-(OH)ase(-/-) mice.     

许旺细胞的IGF-Ⅰ基因转染及其mRNA和蛋白表达

为探索类胰岛素生长因子Ⅰ（ＩＧＦⅠ）基因转染许旺细胞的可能性,采用体外培养许旺细胞（ＳＣｓ）,构建ＩＧＦⅠ逆转录病毒载体,利用基因转染技术将ＩＧＦⅠ基因转入ＳＣｓ,核酸分子杂交及细胞免疫组化检测ＳＣｓ 表达ＩＧＦⅠｍ ＲＮＡ及其蛋白水平,辅以正常ＳＣｓ作对照。结果：ｐＬＸＳＮＩＧＦⅠ转染的ＳＣｓ在体外相同培养条件下较正常ＳＣｓ 表达ＩＧＦⅠｍ ＲＮＡ 及其蛋白水平能力分别增强４８ 和３２ 倍,均有显著意义。研究表明,利用基因转染技术可将外源性ＩＧＦⅠ基因转入ＳＣｓ,提高ＳＣｓ中的ＩＧＦⅠ的含量和活性     

小儿惊泻病机浅析

认为由于生活方式的改变,影响小儿的外物增多,惊则气乱,而发泄泻,其治疗当责之心、肝、脾。     

高温致金黄地鼠神经管畸形的上调表达基因筛选及其鉴定

目的:筛选高温致金黄地鼠神经管畸形的上调表达基因,探讨其分子生物学机制。方法:通过抑制性消减杂交技术获得消减产物,转化大肠杆菌DH5α,构建高温致金黄地鼠胚胎神经管畸形的消减cDNA文库;联合蓝白斑和菌落PCR方法筛选含插入片段的阳性克隆,进行测序和同源性分析,并经Northern杂交技术检测基因的表达。结果:成功构建高温致金黄地鼠胚胎神经管畸形的消减cDNA文库,其中2个克隆插入片段的基因序列与小鼠磷酸甘油酸酯激酶(Pgk-1)同源。Northern杂交证实该基因在高温致畸胚胎神经管的表达较其在同龄正常胚胎神经管明显升高。结论:Pgk-1的上调表达可能与高温致神经管畸形密切相关。     

小鼠肺、肝和肾间质树突状细胞的形态与组织分布

目的:了解小鼠肺、肝和肾间质树突状细胞的形态与分布特点。方法:电镜形态学观察及表面分子CD11c、CD205与共刺激分子CD80、CD86和MHC-Ⅱ类分子免疫组织化学标记,观察研究C57BL/6小鼠肺、肝和肾间质树突状细胞的形态和分布特点。结果:间质树突状细胞具有特征性的胞质突起,广泛分布于肺、肝与肾间质中,数量较少,大部分处于非成熟状态,低表达CD205、CD80、CD86和MHC-Ⅱ类分子。结论:间质树突状细胞是脏器免疫微环境的重要组成部分和免疫前哨细胞。     

The clinical relevance of ultra-widefield angiography findings in patients with central retinal vein occlusion and macular oedema receiving anti-VEGF therapy

AimsTo report, using ultra-widefield angiography (UWFA) the area, distribution, and change in retinal capillary nonperfusion (RCNP) at baseline and 100 weeks in eyes with central retinal vein occlusion (CRVO) receiving anti-VEGF for macula oedema.MethodsProspective longitudinal multi-centre cohort study. Adults with CRVO treated with anti-VEGF therapy for macular oedema underwent UWFA at baseline and week-100. The area, distribution, and change in total, peripheral and posterior pole RCNP were determined.ResultsOf 153 eyes at baseline, mean area of RCNP was 34.3DA and 12 (7.8%) had ≥75DA RCNP. More than 10DA RCNP was present in the temporal periphery in 75.8% of eyes vs. 10.5% in the nasal periphery. At week-100, mean RCNP was 42.1DA with a median change from baseline of 3.3DA 95% CI [0.4, 7.3]; p < 0.01. Of 146 eyes with ≤10DA of posterior pole RCNP at baseline, 16/146 (11.0%) progressed to >10DA at week-100. These eyes had a median increase in total RCNP of 69.7DA [95% CI 27.2–85.4] vs 0DA [0.0–1.4]; p < 0.001 for those who did not, and two developed neovascular glaucoma. Larger baseline area of RCNP and history of glaucoma were risk factors for posterior pole RCNP developing.ConclusionsWith UWFA, significant baseline RCNP was identified in the majority of CRVO patients, notably in the temporal periphery, but large increases over 100 weeks were uncommon. Development of >10DA posterior pole RCNP is a marker for widespread RCNP and in such cases the risk of anterior segment neovascularisation is not abolished by concomitant anti-VEGF therapy.Subject terms: Retinal diseases, Vision disorders     

人参皂甙Rh-2对细胞间连接黏附分子在小鼠移植瘤淋巴管表达的影响

目的观察细胞间黏附分子(JAM)在小鼠移植瘤淋巴管内皮细胞的表达及人参皂甙Rh-2的影响,探讨JAM在癌淋巴管转移中的意义。方法于小鼠前肢皮下接种S180小鼠癌性腹水,成瘤后给予人参皂甙Rh-2灌服,6周后取材。用免疫组化法观察LYVE-1、JAM-1、JAM-2在淋巴管内皮细胞的表达。结果在对照组肿块的周边部可见LYVE-1阳性表达的淋巴管,JAM-1、JAM-2在淋巴管有阳性表达,用药组表达减少。结论JAM-1、JAM-2在淋巴管内皮细胞的表达可能与癌淋巴管转移有关。     

Optimization of photo-biomodulation therapy for wound healing of diabetic foot ulcers in vitro and in vivo

Unclear optical parameters make photo-biomodulation (PBM) difficult to implement in diabetic foot ulcer (DFU) clinically. Here, 12 wavelengths (400–900 nm) were used to conduct PBM to heal DFU wounds in vitro and in vivo. PBM at 10 mW/cm² and 0.5–4 J/cm² with all 12 wavelengths promoted proliferation of diabetic wound cells. In a mimic DFU (mDFU) rat model, PBM (425, 630, 730, and 850 nm, and a combination light strategy) promoted mDFU healing. The positive cell proliferation, re-epithelialization, angiogenesis, collagen synthesis, and inflammation were possible mechanisms. The combination strategy had the best effect, which can be applied clinically.     

住院医师规范化培训之“333”制管理模式运行与思考

调查本院103名“333”制人员,主要是临床类研究生和住院医师的“333”制活动出勤情况,结合我院以往住院医师规范化培训的相关情况,对取得的经验进行总结,探讨规范化管理“333”制人员的方法和最佳运行机制。