Characterization of knitted polymeric scaffolds for potential use in ligament tissue engineering

Different scaffolds have been designed for ligament tissue engineering. Knitted scaffolds of poly-L-lactic acid (PLLA) yarns and co-polymeric yarns of PLLA and poly(glycolic acid) (PLGA) were characterized in the current study. The knitted scaffolds were immersed in medium for 20 weeks, before mass loss, molecular weight, pH value change in medium were tested; changes in mechanical properties were evaluated at different time points. Results showed that the knitted scaffolds had 44% porosity. There was no significant pH value change during degradation, while there was obvious mass loss at initial 4 week, as well as smooth molecular weight drop of PLLA. PLGA degraded more quickly, while PLLA kept its integrity for at least 20 weeks. Young's modulus increased while tensile strength and strain at break decreased with degradation time; however, all of them could maintain the basic requirements for ACL reconstruction. It showed that the knitted polymeric structures could serve as potential scaffolds for tissue-engineered ligaments.     

Expression and changes of HSP70 in the rat forebrain subjected to gamma knife (100Gy) irradiation targeted on the caudate putamen and survived for different times

Forebrain heat shock protein 70 (HSP70) immunohistochemical reactivity was investigated in rats subjected to gamma knife irradiation focusing on the right caudate putamen nucleus. The forebrain sections of all experimental animals were processed with anti-HSP70 antiserum and then by avidin-biotin peroxidase complex immunohistochemistry after gamma ray irradiation with a dose of 100Gy and they each survived for different times (from 30 min to 30 days). Some neurons, glial cells, and endothelial cells were HSP70-like immunoreactivity (HSP70-LI) positive. HSP70-LI was mainly distributed in the target area of irradiation, as well as in non-target regions, e.g. the cortex, hippocampus, and hypothalamus, etc. The expression and change of HSP70-LI from 3 h to 30 days after irradiation followed the following rules: (1) Within 3 to 24 h, the dilated vessels with HSP70-LI endothelial cells were found at first, and a few lightly stained HSP70-LI neurons and glias were observed in the target and non-target regions; (2) In 3-7 days, darkly stained HSP70-LI neurons and glias were apparently increased and formed an expression peak. From 14 to 30 days, HSP70-LI cells were distinctly decreased and became weakly stained or negative. These results suggested that although the irradiation target of the gamma knife was localized, the response to irradiation occurred extensively.     

不同浓度的臭氧对实验兔骨骼肌病理学的影响

目的 观察两种浓度的臭氧(03)对实验兔骨骼肌组织的病理变化的影响,以评估臭氧对肌纤维的氧化程度.方法 10只实验兔随机分为A、B两组.随机选择一侧大腿肌肉注射臭氧-氧气混合气体,A组为浓度50μg/ml,B组为浓度30μg/ml两组分别注射5 ml气体.注射臭氧后0.5、2 h和2周后分别对臭氧注射点、旁开1 cm和2 cm取活检组织行病理学光镜检查,对侧大腿相对应部位取活检作空白对照.结果 与空白对照组比较,病理光镜下显示A、B两组注射臭氧后0.5 h注射点、旁开1 cm见肌细胞肿胀,间隙变窄或不清,肌细胞边界不清,横纹紊乱,部分肌细胞坏死溶解,空泡变性;2 h后注射点、旁开1 cm处在肌细胞坏死溶解的基础上出现了肌细胞间隙和血管内炎症细胞浸润;2周后注射点、旁开1 cm切片显示肌细胞明显萎缩,大量纤维组织增生,部分伴有玻璃样变.上述3个时点的注射点旁开2 cm病理切片均未见异常.结论 两种浓度的臭氧肌肉注射后会产生程度相当的肌细胞损害,范围半径约2 cm,可能对炎性肌细胞或肌纤维化组织起治疗作用,2周后纤维组织损伤修复.     

Study of the mechanism of essential garlic oil inhibiting lnterleukin-1 α-induced monocyte adhesion to endothelial cells

Objective  

To observe the effects of essential garlic oil (EGO) on vascular cell adhesive molecule-1 (VCAM-1) expression of endothelial cells and monocyte-endothelial cell adhesion rate induced by interleukin-l_α(IL-l_α).     

Complete urethral injury in the penile fracture: a case report and literature review

Penile fracture is described as a traumatic rupture of the tunica albuginea caused by blunt injury to the erect penis. It usually occurs as a single rupture of the tunica albuginea in one of two corpora cavernosa; a rupture with urethral injury is an extremely rare condition. Although its diagnosis is usually clinical, ultrasound plays an important role in confirming diagnosis and identifying the site of the injury. Here, we presented a case of penile fracture with complete urethral injury. A 43-year-old male was admitted to the hospital because of trauma to the genital and dysuria following sexual intercourse. After admission, the patient was diagnosed with double penile fracture and complete urethral injury after the physical and B-ultrasound examinations. Emergency surgery to remove the hematoma and repair the urethra was performed. The patient recovered smoothly and was discharged on the third day after operation. After two months’ follow-up, the patient urinated smoothly and achieved an adequate erection without other complications. In this case, consistent with previous studies, emergency surgery for penile fracture is necessary and can preserve the urethral function and sexual function. In addition, there are two lesions in tunica albuginea in this case, so careful search for the penile shaft during the surgery is important to avoid the missed injuries. This report provides evidence of an uncommon and underreported clinical case.     

1例肺移植的干燥综合征患者联用奈玛特韦/利托那韦与环孢素、他克莫司导致肾功能损伤

1例76岁右单肺移植的干燥综合征男性患者在新冠病毒感染后使用奈玛特韦/利托那韦治疗,导致合并使用的免疫抑制剂环孢素和他克莫司全血药物谷浓度升高,引起血肌酐升高,后通过停用环孢素、调整他克莫司剂量使他克莫司浓度维持在治疗浓度,血肌酐水平较前改善,患者好转出院。此病例可为临床安全用药实践提供参考。     

造血干/祖细胞的体外扩增培养研究

利用旋转壁式生物反应器(Rotating wall vessel,RWV)体外培养脐带血干细胞,使其大量扩增,以满足临床应用对造血干/祖细胞的数量与质量要求。从脐带血分离得到的单个核细胞(Mononuclear cells,MNC)在T-flask中培养24h,之后接种到RWV反应器中,培养200h。每24h细胞计数,测量培养基的pH和渗透压变化;在144h和197h测CD34 细胞含量并做CFU-GM半固体培养。有核细胞(Nucleated cells,NC)与CD34 细胞在第197h,分别扩增了435.5±87.6倍和32.7±15.6倍,CFU-GM(Colony-forming unit-granulocyte/macrophage)细胞扩增了21.7±4.9倍。整个培养过程中,RWV反应器中的pH和渗透压都保持在造血细胞最佳的扩增条件内,pH基本保持在7.2~7.4之间,渗透压基本保持在290~310mmol/kg之间。由于旋转壁式生物反应器(RWV)结构上的特殊性,可以保证细胞在悬浮流动的状态下生长,很好地模拟了脐带中的造血微环境,使脐带血造血干细胞在该反应器中短期内得到大量扩增。     

Exact BPF and FBP algorithms for nonstandard saddle curves

A hot topic in cone-beam CT research is exact cone-beam reconstruction from a general scanning trajectory. Particularly, a nonstandard saddle curve attracts attention, as this construct allows the continuous periodic scanning of a volume-of-interest (VOI). Here we evaluate two algorithms for reconstruction from data collected along a nonstandard saddle curve, which are in the filtered backprojection (FBP) and backprojection filtration (BPF) formats, respectively. Both the algorithms are implemented in a chord-based coordinate system. Then, a rebinning procedure is utilized to transform the reconstructed results into the natural coordinate system. The simulation results demonstrate that the FBP algorithm produces better image quality than the BPF algorithm, while both the algorithms exhibit similar noise characteristics.     

肝病患者血浆凝血酶原时间及其INR值的探讨

目的 :探讨凝血酶原时间 (PT)及其国际标准化比率 (INR)在各种肝脏疾病中的变化。方法 :采用含钙凝血活酶对肝病患者血浆用凝固法测定 ,报告INR值。结果 :肝硬化、肝癌和肝炎患者与正常对照组比较 ,PT延长均具有显著性 (P <0 .0 5～P <0 .0 1)。结论 :PT测定不仅具有外源性凝血系统筛选试验的意义 ,也可以作为肝病患者对病程进展及严重程度的参考指标。     

电针肾俞、膈俞、百会穴对拟血管性痴呆学习记忆障碍小鼠水迷宫实验的影响

目的　观察电针肾俞、膈俞、百会穴对拟血管性痴呆小鼠学习记忆障碍的影响。方法　复制脑缺血再灌注拟血管性痴呆小鼠模型 ,并电针肾俞、膈俞、百会穴 ,分别于术后 7天、15天、30天 ,与药物喜德镇对照 ,采用水迷宫法 ,记录游全程时间、错误次数。结果　造模导致了小鼠学习与记忆能力下降 ,表现为游全程时间延长 ,错误次数增加 ,且随着观察时间的延长 ,这种改变逐渐加重。电针和喜德镇均可使模型小鼠的游全程时间缩短 ,错误次数减少 ,但电针组于 7天和 30天时 ,成绩显著优于药物组。结论　电针肾俞、膈俞、百会穴对模型小鼠学习与记忆能力下降有改善和提高作用