FSH and bFGF stimulate the production of glutathione in cultured rat Sertoli cells

Migration of developing germ cells from the basal to the adluminal compartment of the seminiferous epithelium requires extensive tissue restructuring, resulting in the production of reactive oxygen species. Sertoli cells are involved in this process. Glutathione (GSH), produced by Sertoli cells, has an essential role in cell protection against oxidative stress. Intracellular GSH content is maintained by de novo synthesis, involving glutamate-cysteine ligase catalytic (GCLC) and modulatory (GCLM) subunits, and by recycling from oxidized GSH, catalysed by glutathione reductase (GR). To assess whether follicle-stimulating hormone (FSH) and basic fibroblast growth factor (bFGF) modulate GSH production in Sertoli cells by regulating the expression of GCLC, GCLM and/or GR, we performed in vitro studies using rat Sertoli cells in primary culture. FSH and bFGF stimulation increased Sertoli cell GSH levels after 24 h incubation. The simultaneous addition of FSH and bFGF did not produce any further effect. GCLM expression was upregulated by FSH and bFGF 6 h. At 24 h, only the FSH-mediated effect was still observed. FSH and bFGF also upregulated GR expression. In conclusion, our results show that FSH and bFGF increase GSH levels in Sertoli cells through stimulation of the de novo synthesis and recycling by upregulating GCLM and GR expression respectively. Therefore, protection of germ cells against oxidative stress seems to be regulated by hormones and germ cell-released growth factors capable of influencing the production of Sertoli cell GSH.     

Ex Vivo Costimulatory Blockade to Generate Regulatory T Cells From Patients Awaiting Kidney Transplantation

Short‐term outcomes of kidney transplantation have improved dramatically, but chronic rejection and regimen‐related toxicity continue to compromise overall patient outcomes. Development of regulatory T cells (Tregs) as a means to decrease alloresponsiveness and limit the need for pharmacologic immunosuppression is an active area of preclinical and clinical investigation. Nevertheless, the immunomodulatory effects of end‐stage renal disease on the efficacy of various strategies to generate and expand recipient Tregs for kidney transplantation are incompletely characterized. In this study, we show that Tregs can be successfully generated from either freshly isolated or previously cryopreserved uremic recipient (responder) and healthy donor (stimulator) peripheral blood mononuclear cells using the strategy of ex vivo costimulatory blockade with belatacept during mixed lymphocyte culture. Moreover, these Tregs maintain a CD3⁺CD4⁺CD25⁺CD127^lo surface phenotype, high levels of intracellular FOXP3 and significant demethylation of the FOXP3 Treg‐specific demethylation region on allorestimulation with donor stimulator cells. These data support evaluation of this simple, brief Treg production strategy in clinical trials of mismatched kidney transplantation.     

Anti‐LG3 Antibodies Aggravate Renal Ischemia–Reperfusion Injury and Long‐Term Renal Allograft Dysfunction

Pretransplant autoantibodies to LG3 and angiotensin II type 1 receptors (AT1R) are associated with acute rejection in kidney transplant recipients, whereas antivimentin autoantibodies participate in heart transplant rejection. Ischemia–reperfusion injury (IRI) can modify self‐antigenic targets. We hypothesized that ischemia–reperfusion creates permissive conditions for autoantibodies to interact with their antigenic targets and leads to enhanced renal damage and dysfunction. In 172 kidney transplant recipients, we found that pretransplant anti‐LG3 antibodies were associated with an increased risk of delayed graft function (DGF). Pretransplant anti‐LG3 antibodies are inversely associated with graft function at 1 year after transplantation in patients who experienced DGF, independent of rejection. Pretransplant anti‐AT1R and antivimentin were not associated with DGF or its functional outcome. In a model of renal IRI in mice, passive transfer of anti‐LG3 IgG led to enhanced dysfunction and microvascular injury compared with passive transfer with control IgG. Passive transfer of anti‐LG3 antibodies also favored intrarenal microvascular complement activation, microvascular rarefaction and fibrosis after IRI. Our results suggest that anti‐LG3 antibodies are novel aggravating factors for renal IRI. These results provide novel insights into the pathways that modulate the severity of renal injury at the time of transplantation and their impact on long‐term outcomes.     

基础医学实验室仪器设备科学管理的思考

充分发挥基础医学实验室培育人才的重要作用,推动教学科研同步发展,必须不断强化基础医学实验室科学管理,健全仪器设备全生命周期各环节的管理制度,提升实验室仪器设备的使用价值并发挥其效益的最大化。文章结合汕头大学医学院在开展生物化学与分子生物学实验室建设中,强化对本科生人才培养的实践,系统阐述了加强基础医学实验室仪器设备科学管理多个层面上的思考。     

血管生成因子修复肺气肿病变的实验研究

目的 观察碱性成纤维细胞生长因子（bFGF）和血管内皮生长因子（VEGF）对大鼠肺气肿模型动脉血气和肺组织病理学的影响,探讨bFGF、VEGF修复肺泡的机制及肺气肿新的发病机制。方法 Wistar大鼠24只,随机分为bFGF组、VEGF组、对照组和健康对照组4组。bFGF组、VEGF组、对照组大鼠气管内一次性注入猪胰弹性蛋白酶（PPE）（250U／kg）复制肺气肿模型,健康对照组以生理盐水对照,4周后模型制成,bFGF组、VEGF组气管内分别注入bFGF（400U／只）和VEGF（2μg/只）,对照组和健康对照组注人生理盐水,每周1次,连续3次。4周后对比大鼠动脉血气和肺泡形态学变化,免疫组化法检测CD34’细胞个数确定肺毛细血管增生情况。结果各组血气分析差异均无统计学意义;bFGF组、VEGF组平均肺泡数（MAN）分别为[（43±8）／视野、（44±9）／视野],均明显多于对照组[（30±6）／视野]（P〈0．01）;平均肺泡面积（MAA）分别为（9856±1864）μm^2、（9804±1929）μm^2,均明显小于对照组[（14525±3408）μm^2]（P〈0．01）;平均内衬间隔（MLI）分别为（196±38）μm、（194±38）μm,均明显小于对照组[（288±68）μm]（P〈0．01）;CD34’阳性细胞相对面积分别为3．7％±1．3％、2．6％±1．2％,均明显多于对照组（0．8％±0．7％）（P〈0．05）。结论 bFGF和VEGF能促进肺毛细血管再生,修复肺气肿的病变。肺毛细血管的损伤可能在肺气肿的发生发展中扮演了重要角色。     

虚拟现实技术在维持性血液透析患者心理负性情绪的应用效果

目的 探讨虚拟现实技术在维持性血液透析患者心理负性情绪的应用效果.方法 选取2020年10月至2021年4月在川北医院附属医院肾内科接受长期维持性血液透析治疗的70例肾病患者为研究对象,采用随机数字表法分为试验组和对照组,每组各35例,两组患者分别接受常规干预及虚拟现实技术干预,对患者干预前后的汉密尔顿焦虑(HAMA)...     

穴位敷贴联合中医综合调护在肾虚型复发性流产患者中的应用效果观察

目的 探讨穴位敷贴联合中医综合调护在肾虚型复发性流产患者中的应用效果.方法 选取2018年1月至2019年12月云浮市中医院收治的肾虚型复发性流产118例,依据随机数字表法分为干预组与对照组,每组各59例;对照组穴位敷贴结合常规护理;干预组穴位敷贴联合中医综合调护;观察两组护理前后中医证候积分、负面情绪及主要症状改善时...     

野战无电源洗片装置的研制与应用

无动力源洗片装置,由洗片箱、暗房和与洗片过程有关的辅助设施构成,并尽量采用符合野战和目前部队装备的材料.它可以较好地帮助放射科工作人员完成平时的训练任务,使其了解摄影后的X线片进入洗片过程的步骤要领,达到熟悉和适应野战条件下的野战影像技术要求;同时该装置还可作为野战医院或卫生队平时的洗片之用.     

长学制医学生基本素质调查分析

本研究通过对长学制临床医学生八项基本素质进行自评,对所得结果进行讨论,提出在临床阶段如何提高长学制医学生素质及相关对策。     

综合性康复干预对房颤射频消融术后患者负性情绪和生活质量的影响

目的探讨综合性康复干预对房颤射频消融术后患者负性情绪和生活质量的影响。方法选取2016年1月～2017年12月拟行射频消融术治疗的阵发性房颤患者78例,分为干预组和对照组。两组均采取射频消融术,对照组术后给予心理安慰、健康教育、饮食干预和心电图检测等干预措施。干预组在对照组基础上加用综合性康复干预,两组均干预12周。评估两组干预前后负性情绪和生活质量变化。结果干预12周后,两组SDS和SAS评分均较前下降(P0.05或P0.01),且干预组下降幅度更显著(P0.05);同时两组躯体功能、心理情感、社会功能和物质生活等4个分项评分均较前明显上升(P0.05或P0.01),且干预组上升值更显著(P0.05)。结论综合性康复干预对房颤射频消融术后患者具有较好的效果,不仅可显著改善其焦虑、抑郁等负性情绪,改善其心理状态,而且可显著提高其生活质量,改善预后。