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目的:研究他克莫司对兔耳瘢痕增生的影响。方法:选10只新西兰白兔雌雄各半,按本研究组建立的改良方法制作兔耳瘢痕模型,左耳为空白对照组涂凡士林软膏,右耳为实验组涂他克莫司软膏。伤后14天、21天、28天、35天及49天采集标本,行苏木精-伊红(HE)及Masson三色法染色,统计成纤维细胞密度,实时定量PCR(Real-time PCR)检测细胞外基质成分Ⅰ型胶原(collagen Ⅰ;ColI)和纤维连接蛋白(fibronectin;Fn),CD4+辅助性T细胞-2(Th2)产生的重要纤维化基因IL-4及参与T细胞早期活化的重要基因巨噬细胞集落刺激因子(macrophage colony stimulating factor;M-CSF)和肿瘤坏死因子-α(tumor necrosis factorα;TNF-α)的表达。结果:HE及Masson三色法染色可见实验组较对照组胶原沉积明显减少,PCR结果可见ColI、Fn、IL-4、M-CSF和TNF-α在实验组中的表达较对照组在各时间点均减少。结论:应用他克莫司可通过下调IL-4、M-CSF和TNF-α的表达来抑制兔耳瘢痕增生。 相似文献
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目的:研究经过医用高能电子线照射兔耳增生性瘢痕实验模型后,观察伤口愈合的情况、瘢痕愈合后的病理改变及肌动蛋白(ACTIN)和血管生长因子(VEGF)表达变化情况。方法:选用日本大耳白兔18只,在每只兔耳腹侧面制作直径6mm的圆形全层皮肤缺损创面10个。将总计360个缺损创面模型随机分为6组,第1组为空白对照组(3只),其余5组为照射组(各3只)。将照射组每只兔耳随机用200cGy、400cGy、600cGy、800cGy、1000cGy的6Mev电子线照射兔耳缺损创面,照射野周围用铅板防护,观察兔耳缺损创面的愈合情况变化及创面愈合后瘢痕组织进展情况。并于致伤一个月后对实验模型取材,进行光镜、电镜及组织学观察。结果:兔耳腹侧面圆形创面缺损,能产生与人类增生性瘢痕类似的增生块。各照射组,缺损创面愈合延迟。总照射剂量相近的情况下,单次不同照射剂量对增生性瘢痕形成的影响有显著性差异。结论:日本大耳白兔可以形成类似人的增生性瘢痕病理改变,可以用作增生性瘢痕研究的实验动物模型。动物实验证明,医用6Mev高能电子线照射治疗是一种有效的治疗增生性瘫痕的方法,总照射剂量相近的情况下,分5次照射、单次剂量400cGy,为最佳照射剂量。 相似文献
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目的:通过建立兔耳增生性瘢痕模型,研究肿瘤坏死因子(tumor necrosis factor-alpha,TNF-α)在减轻增生性瘢痕形成中的作用。方法:建立兔耳增生性瘢痕模型,实验动物随机分为A、B、C、D、E五组,并设C组为对照组,A、B、D、E组瘢痕内分别注射不同浓度TNF-α溶液0.1ml(100ng/ml,500ng/ml,1000ng/ml,5000ng/ml),C组瘢痕内注射等量生理盐水。观察增生性瘢痕组织块的组织结构、成纤维细胞的密度以及caspase-3蛋白的表达情况。分析不同浓度TNF-α对增生性瘢痕形成的影响。结果:瘢痕增生块减轻程度随TNF-α浓度增加而增加,即TNF-α浓度越高,增生性瘢痕体积越小,成纤维细胞密度越低,caspase-3表达强度越强。结论:肿瘤坏死因子-α可明显抑制兔耳增生性瘢痕的形成及瘢痕组织增生. 相似文献
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病理性瘢痕作为临床上的常见病、多发病,因其发病机制尚不十分明了,一直以来,缺少理想的防治手段。限制人们对瘢痕研究的一个重要原因,是长期以来缺少合适的瘢痕实验的动物模型。兔耳增生性瘢痕实验模型的建立,为人们研究瘢痕提供了一个理想的平台。我们在查阅大量国内外资料的基础上,就兔耳增生性瘢痕实验模型的建立及应用做一综述。 相似文献
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《中国美容医学》2016,(5)
目的:本实验研究联合外用干扰素软膏和曲安奈德软膏对兔耳增生性瘢痕组织的抑制作用。方法:健康新西兰大耳白兔100只,建立兔耳增生性瘢痕模型,每只兔耳造模一个,筛选80只达到实验要求的增生性瘢痕模型。随机分为5组,每组16只计瘢痕32个,A组为实验组联合外用干扰素软膏和曲安奈德软膏,B组为单用干扰素软膏,C组为单用曲安奈德软膏,D组为联合肌注曲安奈德和干扰素,E组为空白对照组。用药3周后对瘢痕进行大体观察,切取瘢痕组织计算瘢痕增生指数,masson染色胶原纤维的形态分布及成纤维细胞数量。结果:A组与D组差异无统计学意义(P0.05);A组与B、C组差异有统计学意义(P0.05);A组与E组差异显著(P0.01)。结论:实验认为干扰素软膏和曲安奈德软膏联合外用能有效抑制兔耳瘢痕增生,比单用药效果更佳,与肌注法比较操作方便,减少并发症,减少组织坏死,可为增生性瘢痕的治疗提供一种新方法。 相似文献
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目的 探讨钙通道阻滞剂维拉帕米对兔耳增生性瘢痕的作用。方法 建立兔耳外伤性皮肤早期瘢痕增生模型 ,将 2 4只兔随机平均分为 3组 ,每组 8只 ,各组瘢痕内分别注射维拉帕米 2 5 μl(0 .0 6 2 5mg) 瘢痕、曲安缩松 2 5 μl(1mg 瘢痕 )、生理盐水 2 5 μl(0 .2 2 5mg 瘢痕 ) ,1次 10d ,共 2次。观察瘢痕外形变化。治疗后 2 0d在瘢痕处取材 ,切片行HE及Masson染色。光镜下观察 ,计算瘢痕增生指数、切片内成纤维细胞数密度 ,计算机辅助图象分析测算切片内胶原纤维面密度。结果 与生理盐水组相比 ,维拉帕米组和曲安缩松组瘢痕均变软、变平 ,色泽变浅 ,瘢痕增生指数及胶原纤维面密度均降低 ,3组间成纤维细胞数密度无显著变化 ;维拉帕米组瘢痕增生指数高于曲安缩松组 ,胶原纤维面密度两组间无显著性差异。结论 外伤性兔耳早期增生性瘢痕局部注射维拉帕米可降低瘢痕内胶原含量 ,引起瘢痕萎缩。本实验条件下维拉帕米的促瘢痕萎缩作用弱于曲安缩松。 相似文献
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二氢青蒿素抑制兔耳瘢痕增生的实验研究 总被引:2,自引:0,他引:2
目的:观察二氢青蒿素对兔耳增生性瘢痕增生的影响。方法:选取成年新西兰大耳白兔16只,建立兔耳增生性瘢痕动物模型,待上皮化后,对实验组、对照组分别给予二氢青蒿素(180mg/kg)和生理盐水(乙醇终浓度为0.1%)各10ml灌胃,术后28天和56天时观察药物对瘢痕增生指数(HI)的影响及光镜下瘢痕变化情况。结果:二氢青蒿素组与生理盐水组之间HI差异均有显著性意义(P〈0.01);光镜下见二氢青蒿素组成纤维细胞凋亡增加及胶原纤维的含量降低。结论:二氢青蒿素可明显抑制兔耳增生性瘢痕的形成及瘢痕组织增生。 相似文献
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反义TGF-β1抑制兔耳增生性瘢痕的实验研究 总被引:1,自引:3,他引:1
目的:探讨反义TGF-β1脱氧寡核苷酸对增生性瘢痕动物模型伤口愈合中瘢痕生成的抑制作用,研究局部使用反义。TGF-β1的有效给药途径。方法:成年日本大耳白兔20只,建立兔耳腹侧面增生性瘢痕模型。采用组织形态学的方法对比研究反义TGF-β1在兔耳增生性瘢痕形成中的影响,并用原位杂交法技术检测兔耳增生块内TGF-β1 mRNA、Ⅰ型胶原蛋白(colla-genⅠ)mRNA、Ⅲ型胶原蛋白(collagenⅢ)mRNA的表达水平。结果:兔左耳增生性瘢痕局部注射反义TGF-β1后,按时间段取材,HE和Masgon染色显示真皮层变薄,成纤维细胞数量明显减少,胶原排列趋于一致。增生块的相对增生高度低于对照组。原位杂交显示TGF-β1 mRNA、collagenⅠmRNA、collagenⅢ mRNA阳性细胞表达率明显降低。结论:反义TGF-β1能抑制兔耳增生性瘢痕的增殖过程,使瘢痕组织纤维化程度明显减轻。局部注射裸DNA治疗瘢痕的给药途径是可行的。 相似文献
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苯妥英外用对兔创面愈合的实验研究 总被引:5,自引:1,他引:5
将苯妥英外用于兔创面上进行自身对照实验,采用创面缩小面积、创面愈合天数、创面组织的光镜及电镜检查,以及创面细菌定量检测等观测指标,发现苯妥英外用有加速创面的愈合,缩短愈合天数;促进创面健康肉芽组织的生长及加速创缘上皮组织向创面中心的生长;减少创面细菌数等作用。 相似文献
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Objective To investigate the effect of botulinum toxin type A (Botox A) injection on hypertrophic scar in rabbit ear model. Methods The hypertrophic scar model was established in 16 Japanese rabbits' ears. These wounds were divided into two groups as group T(treated with Botox A, n =48) and group S (not treated, n = 48). The wounds healing times and scar hypertrophy were observed with 8 specimen of normal skin at the rabbit ears as sham group B. HE stain was used to assess the hypertrophic index(HI). The expression of collagen Ⅰ and Ⅲ was tested by western-blot. The cell cycle of fibroblasts was studied by flow cytometry. Results The [] was significantly lower in group T than in group S(P < 0.01). The expression of collagen Ⅰ and Ⅲ, as well as the ratio of Ⅰ to Ⅲ, was markedly stronger in group S than in group T(P < 0.01). Compared with group T, more fibroblasts were in G2-M in gToup S and fewer in G0-G1 (P <0.05). Conclusions Local injection of Botox A can inhibite the formation of hypertrophic scar and the activity of fibroblasts in rabbit ear model. It can significantly decrease the expression of collagen Ⅰ and Ⅲ in hypertrophic scar, as well as the ratio of collagen Ⅰ to Ⅲ. It serves as the basis for the treatment of hypertrophic scar with Botox A. 相似文献
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Objective To investigate the effect of botulinum toxin type A (Botox A) injection on hypertrophic scar in rabbit ear model. Methods The hypertrophic scar model was established in 16 Japanese rabbits' ears. These wounds were divided into two groups as group T(treated with Botox A, n =48) and group S (not treated, n = 48). The wounds healing times and scar hypertrophy were observed with 8 specimen of normal skin at the rabbit ears as sham group B. HE stain was used to assess the hypertrophic index(HI). The expression of collagen Ⅰ and Ⅲ was tested by western-blot. The cell cycle of fibroblasts was studied by flow cytometry. Results The [] was significantly lower in group T than in group S(P < 0.01). The expression of collagen Ⅰ and Ⅲ, as well as the ratio of Ⅰ to Ⅲ, was markedly stronger in group S than in group T(P < 0.01). Compared with group T, more fibroblasts were in G2-M in gToup S and fewer in G0-G1 (P <0.05). Conclusions Local injection of Botox A can inhibite the formation of hypertrophic scar and the activity of fibroblasts in rabbit ear model. It can significantly decrease the expression of collagen Ⅰ and Ⅲ in hypertrophic scar, as well as the ratio of collagen Ⅰ to Ⅲ. It serves as the basis for the treatment of hypertrophic scar with Botox A. 相似文献
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Objective To investigate the effect of botulinum toxin type A (Botox A) injection on hypertrophic scar in rabbit ear model. Methods The hypertrophic scar model was established in 16 Japanese rabbits' ears. These wounds were divided into two groups as group T(treated with Botox A, n =48) and group S (not treated, n = 48). The wounds healing times and scar hypertrophy were observed with 8 specimen of normal skin at the rabbit ears as sham group B. HE stain was used to assess the hypertrophic index(HI). The expression of collagen Ⅰ and Ⅲ was tested by western-blot. The cell cycle of fibroblasts was studied by flow cytometry. Results The [] was significantly lower in group T than in group S(P < 0.01). The expression of collagen Ⅰ and Ⅲ, as well as the ratio of Ⅰ to Ⅲ, was markedly stronger in group S than in group T(P < 0.01). Compared with group T, more fibroblasts were in G2-M in gToup S and fewer in G0-G1 (P <0.05). Conclusions Local injection of Botox A can inhibite the formation of hypertrophic scar and the activity of fibroblasts in rabbit ear model. It can significantly decrease the expression of collagen Ⅰ and Ⅲ in hypertrophic scar, as well as the ratio of collagen Ⅰ to Ⅲ. It serves as the basis for the treatment of hypertrophic scar with Botox A. 相似文献
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Objective To investigate the effect of botulinum toxin type A (Botox A) injection on hypertrophic scar in rabbit ear model. Methods The hypertrophic scar model was established in 16 Japanese rabbits' ears. These wounds were divided into two groups as group T(treated with Botox A, n =48) and group S (not treated, n = 48). The wounds healing times and scar hypertrophy were observed with 8 specimen of normal skin at the rabbit ears as sham group B. HE stain was used to assess the hypertrophic index(HI). The expression of collagen Ⅰ and Ⅲ was tested by western-blot. The cell cycle of fibroblasts was studied by flow cytometry. Results The [] was significantly lower in group T than in group S(P < 0.01). The expression of collagen Ⅰ and Ⅲ, as well as the ratio of Ⅰ to Ⅲ, was markedly stronger in group S than in group T(P < 0.01). Compared with group T, more fibroblasts were in G2-M in gToup S and fewer in G0-G1 (P <0.05). Conclusions Local injection of Botox A can inhibite the formation of hypertrophic scar and the activity of fibroblasts in rabbit ear model. It can significantly decrease the expression of collagen Ⅰ and Ⅲ in hypertrophic scar, as well as the ratio of collagen Ⅰ to Ⅲ. It serves as the basis for the treatment of hypertrophic scar with Botox A. 相似文献
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Objective To investigate the effect of botulinum toxin type A (Botox A) injection on hypertrophic scar in rabbit ear model. Methods The hypertrophic scar model was established in 16 Japanese rabbits' ears. These wounds were divided into two groups as group T(treated with Botox A, n =48) and group S (not treated, n = 48). The wounds healing times and scar hypertrophy were observed with 8 specimen of normal skin at the rabbit ears as sham group B. HE stain was used to assess the hypertrophic index(HI). The expression of collagen Ⅰ and Ⅲ was tested by western-blot. The cell cycle of fibroblasts was studied by flow cytometry. Results The [] was significantly lower in group T than in group S(P < 0.01). The expression of collagen Ⅰ and Ⅲ, as well as the ratio of Ⅰ to Ⅲ, was markedly stronger in group S than in group T(P < 0.01). Compared with group T, more fibroblasts were in G2-M in gToup S and fewer in G0-G1 (P <0.05). Conclusions Local injection of Botox A can inhibite the formation of hypertrophic scar and the activity of fibroblasts in rabbit ear model. It can significantly decrease the expression of collagen Ⅰ and Ⅲ in hypertrophic scar, as well as the ratio of collagen Ⅰ to Ⅲ. It serves as the basis for the treatment of hypertrophic scar with Botox A. 相似文献
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Objective To investigate the effect of botulinum toxin type A (Botox A) injection on hypertrophic scar in rabbit ear model. Methods The hypertrophic scar model was established in 16 Japanese rabbits' ears. These wounds were divided into two groups as group T(treated with Botox A, n =48) and group S (not treated, n = 48). The wounds healing times and scar hypertrophy were observed with 8 specimen of normal skin at the rabbit ears as sham group B. HE stain was used to assess the hypertrophic index(HI). The expression of collagen Ⅰ and Ⅲ was tested by western-blot. The cell cycle of fibroblasts was studied by flow cytometry. Results The [] was significantly lower in group T than in group S(P < 0.01). The expression of collagen Ⅰ and Ⅲ, as well as the ratio of Ⅰ to Ⅲ, was markedly stronger in group S than in group T(P < 0.01). Compared with group T, more fibroblasts were in G2-M in gToup S and fewer in G0-G1 (P <0.05). Conclusions Local injection of Botox A can inhibite the formation of hypertrophic scar and the activity of fibroblasts in rabbit ear model. It can significantly decrease the expression of collagen Ⅰ and Ⅲ in hypertrophic scar, as well as the ratio of collagen Ⅰ to Ⅲ. It serves as the basis for the treatment of hypertrophic scar with Botox A. 相似文献
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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。 相似文献
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Objective To investigate the effect of botulinum toxin type A (Botox A) injection on hypertrophic scar in rabbit ear model. Methods The hypertrophic scar model was established in 16 Japanese rabbits' ears. These wounds were divided into two groups as group T(treated with Botox A, n =48) and group S (not treated, n = 48). The wounds healing times and scar hypertrophy were observed with 8 specimen of normal skin at the rabbit ears as sham group B. HE stain was used to assess the hypertrophic index(HI). The expression of collagen Ⅰ and Ⅲ was tested by western-blot. The cell cycle of fibroblasts was studied by flow cytometry. Results The [] was significantly lower in group T than in group S(P < 0.01). The expression of collagen Ⅰ and Ⅲ, as well as the ratio of Ⅰ to Ⅲ, was markedly stronger in group S than in group T(P < 0.01). Compared with group T, more fibroblasts were in G2-M in gToup S and fewer in G0-G1 (P <0.05). Conclusions Local injection of Botox A can inhibite the formation of hypertrophic scar and the activity of fibroblasts in rabbit ear model. It can significantly decrease the expression of collagen Ⅰ and Ⅲ in hypertrophic scar, as well as the ratio of collagen Ⅰ to Ⅲ. It serves as the basis for the treatment of hypertrophic scar with Botox A. 相似文献