The roles of knitted mesh-reinforced collagen–chitosan hybrid scaffold in the one-step repair of full-thickness skin defects in rats

Full-thickness skin defects represent a significant and urgent clinical problem. Dermal substitutes serving as a regenerative template to induce dermal reconstruction provide a promising method to treat serious skin defects. Although collagen–chitosan dermal scaffolds display good biocompatibility and a suitable porous structure for angiogenesis and tissue regeneration, their poor mechanical properties compromise their application. To develop a well-supported dermal substitute, a poly(l-lactide-co-glycolide) (PLGA) knitted mesh was fabricated and integrated with collagen–chitosan scaffold (CCS) to obtain a PLGA knitted mesh-reinforced CCS (PLGAm/CCS). The morphology of this PLGAm/CCS was investigated in vitro. To characterize the tissue response, specifically angiogenesis and tissue regeneration, the PLGAm/CCS was transplanted in combination with thin split-thickness autografts to repair full-thickness skin wounds using a one-step surgical procedure in Sprague–Dawley rats. These results were then compared with CCSs. At weeks 2, 4 and 8 after the operation, the healing wounds were imaged to analyse wound changes, and tissue specimens were harvested for histology, immunohistochemistry, real-time quantitative polymerase chain reaction and Western blot analysis. The results demonstrated that collagen–chitosan sponge in the PLGAm/CCS remained porous, interconnected and occupied the openings of PLGA mesh, and the incorporation of the PLGA knitted mesh into CCS improved the mechanical strength with little influence on its mean pore size and porosity. Following transplantation, PLGAm/CCS inhibited wound contraction, and effectively promoted neotissue formation and blood vessel ingrowth. In conclusion, the mechanical strength of the scaffolds plays an important role in the process of tissue regeneration and vascularization. The ability of PLGAm/CCS to promote angiogenesis and induce in situ tissue regeneration demonstrates its potential in skin tissue engineering.     

A Prognostic Biomarker for Gastric Cancer With Lymph Node Metastases

Gastric cancer is one of the leading causes of tumor‐related deaths in China. The tumor, node, metastasis (TNM) classification system is useful for predicting clinical prognosis of patients with gastric cancer. However, determining the presence of lymph node involvement in the early stages of gastric cancer is difficult without biopsy. Therefore, it is necessary to identify novel serum biomarkers for TNM cancer staging and prognostic follow‐up. In this study, we have reported fibrinopeptide‐A (FPA) with alanine truncation at the N‐terminal as a novel biomarker to differentiate gastric cancer with and without lymph node metastases. We analyzed 369 individual serum samples including gastric cancer patients without lymph node metastases (n = 33), gastric cancer patients with lymph node metastases (n = 157; confirmed by pathology), and age‐ and sex‐matched healthy individuals (n = 179). The data showed that 85.4% of patients with lymph node metastases were positive for FPA with alanine truncation at the N‐terminal (degAla‐FPA, 1,465.63 Da), as determined by tandem mass spectrometry (MS). Using degAla‐FPA as the biomarker, the sensitivity was 85.4% for gastric cancer patients with lymph node metastases, and the specificity was 100% for gastric cancer patients without lymph node metastases. The high sensitivity and specificity achieved with serum degAla‐FPA levels indicated that MS technology could facilitate the discovery of a novel and quantitative prognostic biomarker for gastric cancer with lymph node involvement. Anat Rec, 296:590–594, 2013. © 2013 Wiley Periodicals, Inc.     

经皮椎体后凸成形术治疗骨质疏松性椎体压缩性骨折围手术期并发症分析

目的:分析经皮球囊椎体后凸成形术治疗骨质疏松性椎体压缩性骨折的围手术期并发症的发生情况。方法:收集2009年6月至2011年12月采用PKP方法治疗椎体压缩性骨折患者63例,其中男18例,女45例,年龄62～91岁,平均75.3岁。所有患者为外伤后腰背部严重疼痛,行走受限,但均无神经症状及体征。影像学检查(X线和MRI)证实为骨质疏松性椎体压缩性骨折。合并症:骨质疏松63例,高血压37例,冠心病10例,贫血29例,糖尿病26例,慢阻肺11例,胃炎及消化性溃疡8例。回顾总结分析其围手术期并发症发生情况。结果:在63例患者中,手术前并发症9例(14.3%),术中及术后并发症17例(26.9%)。其中手术前并发症包括:坠积性肺炎1例,电解质紊乱2例,尿路感染2例,中度贫血2例,电解质紊乱合并中度贫血1例,坠积性肺炎合并神智淡漠、谵妄1例。术中及术后并发症中,骨水泥相关并发症9例(14.3%),其中2例患者出现骨水泥毒性反应,7例发生骨水泥渗漏(2例出现相关临床症状);非骨水泥相关并发症3例(4.76%),穿刺局部血肿1例,一过性神经损伤1例,术后左侧肋间神经痛1例;所有患者中,共有5例患者(7.93%)术后出现一过性的痛觉过敏。所有并发症经积极处理后均未导致严重后果。结论:PKP治疗骨质疏松性椎体压缩性骨折的围手术期并发症并不少见,经积极处理一般无严重后果,应重视围手术期并发症的预防和处理。     

自体富血小板血浆对自体脂肪颗粒组织移植存活率影响的研究

目的探讨混合注射富血小板血浆最佳浓度,并通过临床混合注射自体富血小板血浆及自体移植脂肪组织,观察自体富血小板血浆对移植脂肪颗粒组织存活率的影响。方法提取抽脂术中获取的脂肪颗粒组织中的脂肪来源干细胞,实验分为4组：A组（对照组）加入10％胎牛血清,B组添加5％富血小板血浆,C组添加10％富血小板血浆,D组添加15％富血小板血浆,传代培养,定时获取细胞行MTT实验,测试细胞生长曲线,并观察细胞形态变化。临床实验选取15例患者,抽取腹部脂肪组织颗粒后进行纯化;同时抽取静脉血,采用离心法提取自体富血小板血浆。纯化的脂肪颗粒与自体富血小板血浆按照10：1的质量比进行混合注射移植。术前、术后1周及术后3个月,患者在B超下行皮下组织厚度测定。结果第3代脂肪来源干细胞培养观察显示,C组有较好的细胞增殖性及活力;临床研究皮下组织厚度增加率为（158．4±83．1）％;术后3个月,皮下组织厚度增加率为（106．4±70．7）％。结论10％富血小板血浆混合浓度对细胞增殖较为适宜,且临床应用可以有效提高自体脂肪颗粒组织移植的存活率,移植后远期仍能达到较为满意的效果,可在临床上进一步推广应用。     

Mobi-C人工椎间盘置换治疗颈椎间盘突出症短期疗效观察

目的探讨应用颈椎人工椎间盘置换治疗颈椎间盘突出症的临床疗效。方法 2009-03-2012-03应用Mobi-C人工颈椎间盘置换术治疗25例颈椎间盘突出症患者,记录并统计分析患者在术前、术后的疼痛视觉模拟评分(VAS)、神经功能改善情况JOA评分及植入节段的运动范围影像学评估。结果 25例患者获得12～36个月随访,平均22个月。术前与术后(VAS)、JOA评分差异有统计学意义(P<0.05);而术前与术后植入节段的运动范围差异无统计学意义(P>0.05)。结论应用Mobi-C人工颈椎间盘置换术治疗颈椎间盘突出症,可以保留手术节段的活动功能,短期临床效果满意,是一种合理选择。     

Pre-existing CD19-independent GL7− Breg cells are expanded during inflammation and in mice with lupus-like disease

Interleukin 10 (IL-10)-producing regulatory B-cells (Bregs) suppress inflammatory responses that mediate autoimmune diseases. However, it is unknown whether Bregs derive from a pre-existing dedicated B-cell lineage or if any B-cell can differentiate into Bregs in response to BCR or TLR activation. GL7⁺ B-cells are antigen-experienced differentiated B-cells while GL7^−/lo are at an early stage of B-cell differentiation. While both GL7^−/lo and GL7⁺ B cells can produce IL-10, differentiation of GL7⁻ B-cells into Bregs does not require CD19- or Bcl6-induced signals, suggesting that BCR-induced proliferation or Ig class-switching is not necessary for generation of Breg cells. Of particular importance, we show that GL7⁻ Breg cells are dramatically expanded in lupus-like mice and GL7⁻ Bregs suppressed inflammatory responses in lupus-like mice by inducing expansion of Foxp3⁺Treg cells. Taken together, these results suggest that pre-existing GL7⁻IL-10⁺ cells are expanded during inflammation, differentiate into GL7⁺ Bregs and contribute to immune-regulation in lupus-like mice.     

老年住院患者衰弱综合征与认知功能障碍和抑郁的相关性分析

  目的  探讨老年住院患者衰弱综合征与认知功能障碍及抑郁的相关性。  方法  选取2019年2月—2020年2月在杭州市第七人民医院治疗的老年患者178例,根据Fried衰弱评估量表将患者分为非衰弱组(42例)、衰弱前期组(64例)和衰弱组(72例)。比较3组患者的一般临床资料,分析衰弱与认知功能障碍和抑郁的相关性,并探讨影响衰弱的危险因素。  结果  3组患者性别、年龄、慢性疾病数量、IL-6、CRP、ALB等方面比较差异有统计学意义(均P＜0.05);衰弱组认知功能障碍和抑郁发生率[43(59.72%)、31(43.06%)]明显高于非衰弱组[3(7.14%)、1(2.38%)]和衰弱前期组[21(32.81%)、15(23.43%)],均P＜0.017,而衰弱前期组明显高于非衰弱组(均P＜0.017);衰弱严重程度与认知功能和抑郁发生率呈正相关关系(r=0.138,P=0.017;r=0.163,P=0.004);Logistic回归分析显示,年龄、慢性疾病数量、认知功能障碍、抑郁是老年患者衰弱发生的独立影响因素。  结论  老年住院衰弱综合征患者的衰弱程度与认知功能障碍、抑郁呈正相关关系;高龄、认知功能障碍、抑郁、慢性疾病数量多是影响老年衰弱综合征的独立危险因素。      

男性2型糖尿病患者胰岛素抵抗与前列腺特异性抗原的相关性研究

目的探讨在男性2型糖尿病患者中胰岛素抵抗与前列腺特异性抗原（prostate specific antigen,PSA）的相关性。方法男性2型糖尿病183例,检测空腹血糖（FPG）、空腹胰岛素（FINS）、糖化血红蛋白（HbA1C）、血脂系列（TC、TG、LDL、HDL）、游离前列腺特异性抗原（fPSA）和总前列腺特异性抗原（tPSA）浓度等相关临床指标,计算胰岛素抵抗指数（HOMAIR）、体质指数（BMI）。根据HOMA-IR分为胰岛素抵抗组（IR≥2.8）和非胰岛素抵抗组（IR〈2.8）;根据tPSA的中位数0.732μg/L,将患者分为tPSA≥0.732μg/L组和tPSA〈0.732μg/L组。结果胰岛素抵抗组（69例）患者的BMI明显高于非胰岛素抵抗组（114例）（P〈0.05）,tPSA明显低于非胰岛素抵抗组（P〈0.05）。tPSA≥0.732μg/L组（92例）的BMI、HOMA-IR均低于tPSA〈0.732μg/L组（91例）（均P〈0.05）。tPSA与年龄、fPSA、LDL呈正相关（r分别为0.345、0.865、0.200;均P〈0.05）,与IR、BMI呈负相关（r分别为-0.151、-0.155;均P〈0.05）。结论胰岛素抵抗和肥胖是导致PSA下降的因素。     

四肢关节专用 MRI 诊断疲劳性骨折的价值简

目的 探讨四肢关节专用MRI诊断疲劳性骨折的价值.方法 回顾性分析46例经临床诊断或随访证实的疲劳性骨折的X线和MRI影像资料.结果 46例数字化X线摄影均未见明确骨折线,而MRI不仅能显示疲劳性骨折的骨折线,而且能显示骨折周围骨髓腔、软组织的水肿和出血,骨膜反应等变化.骨折线在T1WI和T2WI均呈低信号,TSE-T2WI和GE-STIR为诊断骨挫伤的最有价值的序列.17例骨膜反应中,12例T2WI表现为包绕骨皮质的环形等或略高信号,5例为低信号.结论 四肢关节专用MRI对疲劳性骨折能作出早期诊断,对临床鉴别诊断和早期干预治疗意义重大.     

微透析法研究罗通定经皮给药在大鼠体内不同部位的浓度分布

目的研究罗通定经皮给药后,药物在大鼠脑、皮下、血管3个部位微透析液和尾静脉血浆的浓度变化。方法采用微透析技术取样,HPLC测定不同时间点大鼠脑、皮下、血管的微透析液的药物浓度以及尾静脉血浆的药物浓度,DAS2．0药动学软件计算药动学参数。结果罗通定20cm^2经皮给药后,在大鼠体内消除缓慢,脑、皮下、血管和血浆AUC0→10h分别为（387．19±162．81）、（245．97±74．60）、（211．41±65．19）和（1677．05±598．83）min·mg·L^-1。体内药物含量血浆中最高,脑微透析次之,血管微透析最低,经皮给药后的AUC脑／AUC血浆、AUC皮下／AUC血浆、AUC血管／AUC血浆分别为（23．45±6．51）％、（15．66±5．03）％和（13．87±5．84）％。结论微透析法能很好地应用于罗通定经皮给药后大鼠不同部位的浓度研究,反映脑、皮下和血管之间的关系。