黑布药膏对兔耳增生性瘢痕成纤维细胞增殖的影响

目的：探讨黑布药膏对兔耳增生性瘢痕成纤维细胞增殖的影响。方法：成年大耳白兔24只,建立兔耳腹侧面增生性瘢痕模型,21天后,将瘢痕动物模型随机分为黑布药膏治疗组和瘢痕模型组,在黑布药膏治疗组瘢痕局部涂抹黑布药膏,每3天一次。在用药后第2、4、6、8周分别切取两组瘢痕组织,对比研究在瘢痕形成过程中黑布药膏对兔耳瘢痕成纤维细胞的影响。采用HE染色法观察瘢痕形态,计算瘢痕增生指数和成纤维细胞密度;采用免疫组化方法检测增殖细胞核抗原（PCNA）蛋白表达。结果：黑布药膏治疗组和模型对照组比较,PCNA蛋白表达明显减弱（P〈0.05）,光镜下见黑布药膏能明显抑制成纤维细胞增殖;黑布药膏能降低瘢痕增生指数和成纤维细胞密度,与模型对照组比较,差异有显著性意义（P〈0.05）。结论：黑布药膏可抑制兔耳增生性瘢痕成纤维细胞增殖。     

595nm激光对兔耳瘢痕成纤维细胞增殖与凋亡的影响

目的：探讨595nmVbeam激光照射对增生性瘢痕动物模型伤口愈合过程中成纤维细胞增殖与凋亡的影响。方法：成年大耳白兔20只,建立兔耳腹侧面增生性瘢痕模型,对比研究在瘢痕形成过程中595nmVbeam激光照射对兔耳瘢痕成纤维细胞的影响,采用免疫组化方法检测增殖细胞核抗原（PCNA）蛋白表达和细胞凋亡的原位检测。结果：兔耳增生性瘢痕经595nmVbeam激光照射后,按不同时间段取材进行免疫组化染色并与对照组比较,高倍镜下观察结果,显示PCNA蛋白表达明显减弱,细胞凋亡增加。结论：595nmVbeam激光照射可抑制兔耳增生性瘢痕成纤维细胞的增殖过程,诱导细胞凋亡。应用595nmVbeam激光预防和治疗瘢痕是可行的。     

15-脱氧-△12,14-前列腺素J2对兔耳增生性瘢痕Ⅰ型胶原表达的影响

目的 观察过氧化物酶体增殖物激活受体γ(PPARγ)的配体15-脱氧-△12,14-前列腺素J2(15d-PGJ2)对兔耳增生性瘢痕Ⅰ型胶原表达的影响,探讨15d-PGJ2防治增生性瘢痕的可行性.方法 选取新西兰大白兔18只,在兔耳腹侧面制作2 cm×3 cm全层皮肤缺损创面,每耳2个,共计72个,建立兔耳增生性瘢痕动物模型,随机分组,分别用15d-PGJ2及生理盐水行瘢痕内注射,1次/d,共7次.停药后第14、21天两组同时取材;每组每次切取18个组织块.应用免疫组织化学、荧光定量聚合酶链反应(PCR)及Western blot检测Ⅰ型胶原的表达.结果 与对照组比较,15d-PGJ2注射后瘢痕体积缩小,变软变平,色泽轻度变浅.Ⅰ型胶原主要分布于真皮的细胞间质、成纤维细胞胞质中,血管壁上亦见阳性信号,在各个时间点15d-PGJ2组Ⅰ型胶原mRNA和蛋白的表达均较对照组低,且差异有统计学意义(P<0.05).结论 PPAR-γ的配体15d-PGJ2可降低瘢痕内Ⅰ型胶原的含量,引起瘢痕萎缩,从而防治瘢痕.     

15-脱氧-△^12,14-前列腺素J2对兔耳增生性瘢痕的作用

目的探讨γ过氧化物酶体增殖物激活受体（peroxisome proliferator activated receptor-7,PPAR-γ）的配体15-脱氧-△^12,14-前列腺素J2（15-deoxy-△^12,14-prostagliandxinJ2,15d—PGJ2）对兔耳增生性瘢痕I型胶原、结缔组织生长因子（connective tissue growth factor,CTGF）、α平滑肌肌动蛋白（a—smooth muscle actin,α—SMA）表达的影响,探讨15d—PGJ2防治增生性瘢痕的可能性。方法选取新西兰大白兔18只,在兔耳腹侧面制作2cm×3cm全层皮肤缺损创面,每耳2个,共计72个,建立兔耳增生性瘢痕动物模型,随机分为2组,一组为实验组,另一组为对照组,分别用15d—PGJ2和生理盐水行瘢痕内注射,1次／d,共7次。停药后第7、14、21天两组同时取材;每组每次切取12个组织块。应用免疫组织化学检测I型胶原、CTGF和α—SMA的表达。结果各组兔耳腹侧创面愈合后均不同程度出现类似人增生性瘢痕的组织块。与对照组相比,15dPGJ2注射后瘢痕体积缩小,变软变平,色泽轻度变浅。在各个时间点15d—PGJ2组I型胶原、CTGF和α-SMA的表达均较对照组低,且差异有统计学意义（P〈0．05）。结论PPAR-γ的配体15d—PGJ2可降低瘢痕内I型胶原、CTGF和α—SMA的含量,引起瘢痕萎缩,有一定防治瘢痕的作用,可能为临床治疗增生性瘢痕提供一条新的途径。     

己基可可碱对兔耳瘢痕组织的作用

目的观察己基可可碱对兔耳增生性瘢痕组织的影响。方法建立兔耳增生性瘢痕动物模型,21d后瘢痕局部注射不同浓度的己基可可碱或生理盐水,49d后观察药物对瘢痕增生指数(hyper trophicindex,HI)的影响及采用图像系统分析瘢痕组织中成纤维细胞数量和胶原含量的变化。结果治疗组中HI与药物浓度呈负相关(P<0.05),治疗组瘢痕组织中成纤维细胞数量与胶原含量均明显减少,呈剂量效应关系;与生理盐水对照组比较,差异有统计学意义(P<0.01)。结论己基可可碱能抑制瘢痕组织中成纤维细胞增殖,并使胶原合成减少,从而抑制兔耳增生性瘢痕组织增生,有望成为防治增生性瘢痕的新药物。     

IL-18在病理性瘢痕中的表达及其生物学意义

目的:比较IL-18在正常皮肤和病理性瘢痕组织中的表达及分布情况,探讨IL-18在病理性瘢痕的形成过程中所起的生物学作用及意义。方法:收集2006年12月到2007年6月广东医学院附属医院整形外科手术切除的正常皮肤10例,增生性瘢痕组织12例,瘢痕疙瘩12例,应用免疫组织化学技术及荧光定量RT-PCR分别检测IL-18蛋白及IL-18 mRNA在它们中的表达水平及分布情况。结果:IL-18在正常皮肤、增生性瘢痕及瘢痕疙瘩中均有表达,IL-18mRNA和IL-18蛋白在瘢痕疙瘩组和增生性瘢痕组之间无明显差异(P0.05),但两者均低于正常皮肤组(P0.05)。结论:IL-18可能是病理性瘢痕组织的形成促进因素之一。     

高压氧对兔耳增生性瘢痕形成的影响

目的：探讨高压氧（Hyperbaric oxygenation,HBO）对兔耳增生性瘢痕形成及对血管内皮生长因子（VEGF）、转化生长因子β1（TGFβ1）表达的影响。方法：选取20只新西兰大白兔建立兔耳瘢痕模型,每耳6个创面,随机分成实验组和对照组2组,每组10只,共120个创面,实验组术后立即给予HBO处理,对照组处于常压环境中。术后第29天切取瘢痕组织,测量瘢痕增生指数（hypertrophic index,HI）,并用HE染色观察瘢痕形态学变化,免疫组织化学方法检测TGFβ1及VEGF的表达。结果：实验组HI值明显低于对照组（P〈0．01）;HE染色结果示实验组成纤维细胞数目较对照组明显减少（P〈0．01）;免疫组织化学检测结果示实验组VEGF、TGFβ1的表达量较对照组显著降低（P〈0．01）。结论：HBO可降低VEGF、TGFβ1的表达,对兔耳增生性瘢痕有明显抑制作用。     

The role of Th1/Th2 cell chemokine expression in hypertrophic scar

The aim of this study was to study the role of Th1/Th2 cell‐associated chemokines in the formation of hypertrophic scars in rabbit ears. Twenty‐six New Zealand white rabbits were used to establish the hypertrophic scar model of rabbit ear and the normal scar model of rabbit's back. Two rabbits were sacrificed on days 0 and 21, 28, 35, 42, 49, 56, and 63 after operation. The specimens were stained with haematoxylin‐eosin (HE). Scar elevation index (SEI) was used to detect the expression of 10 chemokines related to Th1/Th2 cells in both scar formation expressions. Real‐time polymerase chain reaction (PCR) results showed that two chemokines (CXCL10, CXCL12) were highly expressed during the formation of normal scar, and there was almost no expression during the formation of hypertrophic scar (*P < 0.05). The chemokines (CCL2, CCL3, CCL4, CCL5, CCL7, CCL13, CX3CL1) were almost non‐expressed in the formation of normal scars but were expressed for a long time in the formation of hypertrophic scars. The four chemokines, CCL2, CCL4, CCL5, and CX3CL1, maintained a long‐term high expression level during the formation of hypertrophic scars (P < 0.01). There were also three chemokines (CCL14, CCL19, CCL21) that were almost undetectable in normal scarring, but there was transiently low‐level expression (P < 0.05) only during the peak proliferative phase in proliferative scarring. Th1/Th2 cell‐associated chemokines are different in the type, quantity and expression, and maintenance time of rabbit ear hypertrophic scars.     

Fibronectin gene expression differs in normal and abnormal human wound healing

The overproduction of fibronectin and type I collagen in keloids and hypertrophic scars implicates altered regulation of extracellular matrix components as an important aspect of these wound healing pathologies. However, little is known about the similarities and differences in extracellular matrix gene expression during normal and abnormal wound healing. This study compared the content of fibronectin messenger RNA and rates of fibronectin protein biosynthesis in fibroblasts derived from normal skin, normal scar, keloid, and hypertrophic scar. Fibronectin expression was enhanced in cells from both normal and abnormal wounds relative to cells from quiescent normal skin. Matched pairs of normal and keloid fibroblasts from the same individuals were also compared, and three of the four pairs showed higher fibronectin expression by the keloid cells at the levels of messenger RNA and protein synthesis. This was consistent with previous studies showing elevated steady state content of fibronectin in keloid cells relative to normal cells from the same individual. Fibronectin messenger RNA and protein content in the tissues from which these cells were derived was examined by in situ hybridization and immunohistochemistry. These studies revealed that in vivo, the steady state content of fibronectin messenger RNA and protein was highest in abnormal wounds, less in most normal scars, and lowest in normal skin. Thus, fibroblasts from keloids and hypertrophic scars overexpressed fibronectin in vivo relative to normal skin and normal scar and retain this characteristic in vitro relative to normal skin. Although normal scars contained little fibronectin protein and messenger RNA, cultured fibroblasts derived from these scars had contents of fibronectin messenger RNA and rates of biosynthesis in vitro similar to those of keloid fibroblasts. This indicates that the fibronectin regulatory pathway in scar fibroblasts is influenced by the tissue environment. These results are discussed with respect to the relationship of fibronectin expression in keloids, hypertrophic scars, and normal wounds in human beings.     

建立更加稳定和有效的兔耳瘢痕模型

目的：建立更加稳定和有效的兔耳瘢痕模型。方法：选用16只新西兰大耳白兔,分别在兔耳腹侧中段作1cm×1cm的全层皮肤缺损共192个,以形态学、瘢痕增生指数及羟脯氨酸（HPr）的含量变化对创面愈合后形成的增生块,进行动态组织病理学、细胞增殖活性及胶原纤维合成等检测。结果：兔耳腹侧中段创面可产生类似于人类的增生性瘢痕,其发生率为91．5％,增生块最长持续时间可达120多天。结论：采用本实验的模型复制方法,可以得到更加稳定和有效的兔耳增生性瘢痕。     

Evaluation of the therapeutic effect of micro-plasma radio frequency on hypertrophic scars in rabbit ears

To evaluate the therapeutic effect of micro-plasma radio frequency on hypertrophic scars in rabbit ears to provide an experimental basis and theoretical foundation for the treatment of hypertrophic scars. Hypertrophic scars were established on the ventral surface of the ears of six New Zealand white rabbits. Left and right ears were randomly divided into two groups: experimental group treated with micro-plasma radio frequency and control group with no treatment. H&E staining and CD34 labeling of microvessels were performed to analyze ear specimens, and immunohistochemical staining was conducted to detect IL-8 and MCP-1 in the scars. Compared with the control group, scar tissue in the experimental group was improved by color and texture. H&E-stained collagen fiber bundles were more organized after treatment as assessed by optical microscopy. The number of microvessels in the experimental group was decreased compared with that in the control group. Microvascular density was significantly reduced in the experimental group compared with the control group (27.16?±?5.64 and 48.75?±?8.25 mm², respectively; P?<?0.01). The mean optical densities of IL-8 and MCP-1 were significantly reduced in the experimental group compared with the control group (IL-8 0.016?±?0.011 and 0.078?±?0.023, respectively; MCP-1 0.018?±?0.016 and 0.054?±?0.038, respectively; both P?<?0.01). The micro-plasma radio-frequency technique has a therapeutic effect on hypertrophic scars in rabbit ears.     

Effects of steroids,interferon-2B,or interluekin 1B on apoptosis of fibroblasts from keloid,hypertrophic scars,and normal skin and related signal pathway

Wound healing can lead to hypertrophic scar or keloid formation, characterized by an overabundant extracellular matrix. Current established treatment strategies include surgical resection, triamcinolone steroid injection, pressure therapy, silicone therapy, radiotherapy, etc. Cytokines also play a critical role in the regulation of cellular activities and extracellular matrix metabolism. Interferons (IFN) represent a group of antifibroproliferative agents that inhibit fibroblast proliferation and collagen production, and interleukin (IL)-1β also accelerates hypertrophic scar fibroblasts to produce collagenolytic enzymes, leading to tissue destruction. This study addressed the effects of steroid, IFN α-2b, or IL-1β on apoptosis and cell pathway of fibroblasts from keloids, hypertrophic scars, and normal skins and different responses of different fibroblasts. Six samples of keloid, six samples of hypertrophic scar, and six samples of normal skin were, respectively, collected from patients, and fibroblasts from different sources were cultured in vitro. After different fibroblasts were treated with dexamethasone (0.1 mg/ml) or IFN α-2b (1,000 μ/ml) or IL-1β (200 μ/ml), Bax and Bcl-2 were detected in situ by immunohistochemical staining; deoxyribonucleic acid ladders of different fibroblasts were observed by gel electrophoresis, and relative activated (phospho-) extracellular-signal-regulated kinase (ERK) 1/2 and c-Jun N-terminal kinase (JNK) pathways were detected by the method of fast activated cell-based enzyme-linked immunosorbent assay. In media containing dexamethasone, apoptosis took place in fibroblasts from keloids, hypertrophic scars, and normal skins by gel electrophoresis with increased rate of Bax/Bcl-2. Activated (phospho-) ERK1/2 and activated (phospho-) JNK expressions increased in three different fibroblasts. In media containing IFN α-2b, no apoptosis took place in three different fibroblasts without any change of expressions of Bax and Bcl-2 except for the expression of decreased Bcl-2 in fibroblasts from keloids. Activated (phospho-) ERK1/2 expression decreased in fibroblasts from keloid and hypertrophic scars without any changes of activated (phospho-) JNK expression, and IFN α-2b did not affect both activated (phospho-) ERK1/2 and activated (phospho-) JNK expressions in fibroblasts from normal skin. In media containing IL-1β, apoptosis of fibroblasts from keloids was induced by stimulating activated (phospho-) ERK1/2 and activated (phospho-) JNK pathways; IL-1β could not induce apoptosis of fibroblasts from normal skin (radio of Bax/Bcl-2 decreasing) whose activated (phospho-) ERK1/2 pathway was stimulated without any changes of activated (phospho-) JNK expression. Apoptosis in fibroblasts from hypertrophic scars was induced by activating the JNK pathway and prohibiting the ERK1/2 pathway. The effects of steroid, IFN α-2b, or IL-1β on apoptosis of different fibroblasts were different through different cell signal pathways, although all of them were effective for treatment of abnormal scars.     

A型肉毒毒素局部应用对兔耳增生性瘢痕创面愈合和瘢痕增生的影响

目的 研究A型肉毒毒素对兔耳增生性瘢痕组织的影响.方法 8只日本大耳白兔,体重3 kg,建立兔耳增生性瘢痕模型.将兔耳创面分为A型肉毒毒素治疗组(T组)和瘢痕组(S组),每组48个创面.大体观察创面愈合时间和瘢痕增生情况.术后28 d,同法另取4只兔子的兔耳腹面健康皮肤为空白组(B组),收集标本.测量S、T组标本HE切片的瘢痕增生指数HI,流式细胞仪分析2组标本中成纤维细胞的细胞周期,western-blot检测S、T、B组标本中Ⅰ、Ⅲ型胶原的蛋白表达.结果 ①T组标本的瘢痕增生指数HI较S组显著降低,P<0.01;②蛋白水平上,T组的胶原Ⅰ、Ⅲ蛋白表达和胶原Ⅰ/Ⅲ比值均较s组显著降低,P<0.01;③S组分布于G2-M期和S期的成纤维细胞较T组显著增多,而静止期G0-G1的细胞则显著减少,P<0.05.结论 A型肉毒毒素局部应用能抑制兔耳增生瘢痕的形成.抑制成纤维细胞的增殖活性,减少瘢痕组织中Ⅰ、Ⅲ型胶原的合成,降低胶原Ⅰ/Ⅲ比值,为其治疗增生性瘢痕的临床应用提供了一定的理论依据.     

瘢痕中肌动蛋白及肌球蛋白的实验研究

目的　探讨增生性瘢痕、瘢痕疙瘩及正常皮肤成纤维细胞中肌动蛋白和肌球蛋白Ⅱ的不同表达情况及其与瘢痕挛缩的关系。方法　取增生性瘢痕15例,瘢痕疙瘩10例,正常皮肤15例,用免疫组织化学方法检测其中肌动蛋白和肌球蛋白Ⅱ的表达情况,同时做细胞培养,用流式细胞术检测成纤维细胞中肌动蛋白和肌球蛋白Ⅱ的表达情况。结果　增生性瘢痕肌球蛋白Ⅱ的免疫组织化学染色呈阳性,而瘢痕疙瘩及正常皮肤肌球蛋白Ⅱ的表达均为阴性。增生性瘢痕肌球蛋白Ⅱ的表达较其它两种组织有非常显著性差异(P<0.01),而瘢痕疙瘩和正常皮肤无显著性差异(P>0.05)。流式细胞术检测增生性瘢痕、瘢痕疙瘩及正常皮肤三种组织中肌球蛋白Ⅱ的阳性率分别为(95.11±2.78)%、(16.86±7.11)%及(5.31±1.79)%,增生性瘢痕肌球蛋白Ⅱ表达的阳性率较其它两种组织有非常显著性差异(P<0.01),而瘢痕疙瘩和正常皮肤无显著性差异(P>0.05)。三种组织中肌动蛋白的免疫组织化学染色均为阳性,无显著性差异(P>0.05)。流式细胞术检测三种组织中肌动蛋白的阳性率分别为(77.77±15.43)%、(88.89±10.29)%及(82.92±13.48)%,其表达的阳性率无显著性差异(P>0.05)。结论　瘢痕挛缩与肌球蛋白Ⅱ密切相关,而肌动蛋白在细胞中除作为细胞的收缩蛋白之一外,同时与细胞的活动及运动有关,是细胞生命活动中必不可少的蛋白之一。     

The role of altered fatty acid in pathological scars and their dermal fibroblasts

PurposeThe proposed pathological mechanism for scar formation is controversial, and increased attention has been paid to the fatty acids (FAs) in the formation of pathological scars. Notably, FAs are known to be important in inflammation and mechanotransduction, which is closely related to scar formation. Therefore, it is necessary to clarify the roles of FA in scar formation.MethodsHypertrophic scar and keloid formed for more than a year and without other treatment, as well as normal skin samples were obtained from patients who underwent plastic surgery. Finally, keloids (n = 10), hypertrophic scars (n = 10), and normal skin samples (n = 10) were collected under informed consent. Primary dermal fibroblasts were isolated and cultured. The amount and variety of FAs were detected by lipid chromatography-mass spectrometry. Immunohistochemistry, real-time PCR, and western blotting were used to verify the expression of sterol regulatory element-binding protein-1 (SREBP1) and fatty acid synthase (FASN) in the samples and their fibroblasts. Student's t-test, ANOVA, and orthogonal partial least square discriminant analysis were performed for statistical analysis (1p < 0.05, 7p < 0.01, 71p < 0.001, 77p < 0.0001).ResultsCompared with full-thickness normal skin, there were 27 differential FAs in keloids and 15 differential FAs in hypertrophic scars (1p < 0.05 and variable influence on projection >1.0). The expression of SREBP1 and FASN was lower in pathological scars both at mRNA and protein levels (all 1p < 0.05). However, the mRNA levels of SREBP1 (71p = 0.0002) and FASN (71p = 0.0021) in keloid-derived fibroblasts were higher than that in normal skin fibroblasts (NFBs), while the expression in hypertrophic scar-derived fibroblasts was lower than that in NFBs (both 1p < 0.05). Whereas there was no significant difference in FASN protein expression between keloid-derived fibroblasts and NFBs (p > 0.05).ConclusionFAs involved in pathological scars are abnormally changed in scar formation. Thus, fatty acid-derived inflammation and de novo synthesis pathway of FA may play a key role in the formation of pathological scars.     

药物抑制兔耳病理性瘢痕中结缔组织生长因子的实验

目的探讨能有效抑制结缔组织生长因子（CTGF）的药物,以便为治疗病理性瘢痕提供依据。方法选择24只大耳白兔建立兔耳病理性瘢痕模型,随机分为4组：A组注射CTGF反义寡核苷酸,B组注射复方倍他米松,C组注射醋酸曲安奈得,D组为对照组,仅注射生理盐水。通过原位杂交法分别检测瘢痕组织中不同治疗组不同时段的CTGF表达,并通过苏木精-伊红（HE）染色法检测瘢痕组织中不同治疗组不同时段的成纤维细胞数。结果A、B、C3组在同一时段其CTGF表达均比D组低,差异有统计学意义（P〈0．05）,A组较B、C两组CTGF表达低,差异也具有统计学意义（P〈0．05）。B、C两组之间CTGF表达差异无统计学意义（P〉0．05）。成纤维细胞计数结果与以上结果基本一致。结论CTGF反义寡核苷酸、复方倍他米松、醋酸曲安奈得均可抑制病理性瘢痕中CTGF的表达,CTGF反义寡核苷酸抑制效果最明显。     

Dynamic changes of autophagy during hypertrophic scar formation and the role of autophagy intervention

BackgroundThe role of autophagy in the formation of hypertrophic scars (HS) remains unclear. This study aimed to explore the role and potential mechanism of autophagy during the development of HS.MethodsRNA and protein expression levels of Beclin-1, p62, and LC3II in normal skin tissues and HS specimens from different patients were examined. Autophagy inducers and inhibitors were used to cure established HS in rabbit ears, and the expression of Beclin-1, p62, and LC3II at the RNA and protein level was determined. Lastly, the effects of autophagy inducers and inhibitors on HS development were analyzed.ResultsCompared to normal skin tissues, the expression of LC3Ⅱ and Beclin-1 was higher (P<0.05), while that of p62 was lower (P<0.05) in HS tissues. In addition, the LC3II/LC3I ratio was increased during HS formation, and the altered expression of the three proteins stabilized after one year. Administration of autophagy inducers enhanced the formation of HS as well as the expression levels of LC3II and Beclin-1 but decreased p62 expression. Meanwhile, administration of autophagy inhibitors increased the expression of LC3II, Beclin-1, and p62, along with reduced HS formation.ConclusionAutophagic activity increased during HS initiation and subsequent stabilization. In addition, autophagy inhibitors were able to inhibit HS formation by suppressing autophagy, whereas autophagy inducers promoted scar hyperplasia by enhancing autophagy.     

一种增生性瘢痕动物模型的建立

目的　建立兔耳瘢痕动物模型 ,观察兔耳腹侧创面在伤后不同时间瘢痕增生的情况。方法　于 32只新西兰白兔的 6 0只兔耳腹面手术切除 2cm× 5cm全层皮肤 ,创面用 1%磺胺嘧啶银冷霜外敷包扎至愈合 ,换药 1次 /周。未作手术的 4只兔耳作对照。 (1)术后连续 12个月观察兔耳创面自然愈合情况。 (2 )用光镜、透射电镜观察兔耳创面瘢痕增生情况。 (3)用计算机图像分析系统测定 1～ 6个月的瘢痕指数。　结果　兔耳创面上皮化后其色泽、厚度和质地均经历从瘢痕形成、成熟到退化的演变过程 ;1～ 2个月的瘢痕指数 2 .2 9± 0 .74较 3～ 4个月 (2 .82± 0 .36 )和 5～ 6个月 (2 .90± 0 .84 )低 (P <0.0 5),其变化与瘢痕增生程度的消长趋势吻合。　结论　兔耳腹面全层皮肤缺损经自然愈合后形成的增生性瘢痕与人体增生性瘢痕相似 ,该模型是研究增生性瘢痕的发生机制及评估其治疗方法的较好的动物模型之一     

局部应用卡托普利凝胶对兔耳增生性瘢痕作用的实验研究

目的观察局部应用卡托普利对兔耳增生性瘢痕的作用。方法将12只日本大耳白兔随机分为:卡托普利组(3只);空白对照组(3只);瘢痕组(3只);正常兔耳对照组(3只)。前3组每只耳朵建立5个兔耳瘢痕,总计90个增生性瘢痕。卡托普利组于术后21天开始局部应用10mg/ml卡托普利羧甲基纤维素胶,28天取材,进行大体观察,组织学检测。结果卡托普利组兔耳增生性瘢痕的瘢痕增生指数、表皮厚度指数较瘢痕对照组分别减少了34.1%、41.5%,真皮内的胶原含量为瘢痕对照组的68.8%(P<0.05)。结论局部应用ACE抑制剂卡托普利能改善兔耳增生性瘢痕的增生。