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1.
本试验用高选择性内皮素A受体拮抗剂BQ123处理低温肉鸡的方法,通过动态观察肺动脉压及肌型、部分肌型及非肌型肺小动脉数量的变化,探讨内源性内皮素在肺血管重塑中的作用。结果显示:30日龄时,低温组平均肺动脉压极显著高于常温组、低BQ123组及高BQ123组(P<0.01);低温组肌型及部分肌型肺小动脉的占位比均极显著高于常温组、低BQ123组及高BQ123组(P<0.01);低温组非肌型肺小动脉占位比极显著低于常温组、低BQ123组和高BQ123组(P<0.01),高BQ123组显著高于低BQ123组(P<0.05)。结果表明,BQ123可明显抑制低温肉鸡肺动脉高压和非肌型肺小动脉的肌型化的发生发展,因此认为内源性ET在低温诱发肺动脉高压肉鸡肺血管重塑的发生发展过程中起重要作用。 相似文献
2.
通过动态观察肺动脉压、红细胞压积、腹水心脏指数、肺小动脉中膜厚度占外径百分值(mMTPA)及管壁面积/管总面积(WA/TA)的变化,探讨高选择性内皮素A受体拮抗剂BQ123对低温诱发肉鸡腹水综合征的预防作用。结果显示,BQ123能显著降低低温诱发肉鸡的肺动脉压、红细胞压积及腹水心脏指数(P0.05或P0.01);BQ123能显著减小低温诱发肉鸡的mMTPA及WA/TA(P0.05或P0.01)。结果表明,BQ123明显抑制了低温诱发肉鸡的肺动脉高压和肺血管重塑的形成和发展,对肉鸡腹水综合征具有明显的预防作用。 相似文献
3.
《中国兽医杂志》2016,(2)
本试验研究低温诱发肉鸡腹水综合征过程中肺动脉壁c-Jun的表达,及阻断钙信号对肺动脉壁c-Jun表达的影响和对肉鸡腹水综合征发生的干预情况,为肉鸡腹水综合征发生机制的研究提供基础。240只15日龄AA肉鸡分为对照组、低温组和维拉帕米组,15~50日龄每组随机取6只测定右心肥大指数,取肺组织做石蜡组织切片进行c-Jun免疫组化染色分析。结果显示,29~50日龄低温组肉鸡右心肥大指数较对照组和维拉帕米组明显升高(P0.05),低温组肉鸡20~50μm、50~100μm和100~200μm肺小动脉c-Jun阳性指数分别从22、29日龄和29日龄开始到50日龄极显著高于对照组和维拉帕米组(P0.01)。研究结果认为,低温诱发肉鸡腹水综合征过程中不同直径大小肺小动脉壁cJun表达明显增强,阻断钙信号可明显抑制肺小动脉壁c-Jun的表达和肉鸡腹水综合征的发生。 相似文献
4.
对环境低温诱发肉鸡肺动脉高压综合征(Pulmonary hypertension syndrome,PHS)过程中肺小动脉壁c-mycmRNA的表达变化进行了研究,从而初步确定原癌基因c-myc在环境低温诱发肉鸡PHS过程中的参与作用,为肉鸡PHS发生机制的研究提供基础。120只雄性AA商品代肉鸡15日龄时随机分为对照组((22±1.5)℃)和低温组((11±2)℃)。15～50日龄,每周每组随机取6只,肺组织做石蜡切片,应用原位杂交染色法进行c-myc mRNA杂交,并结合图像分析法,测定环境低温诱发肉鸡PHS过程中肺小动脉壁原癌基因c-myc mRNA的表达情况。结果显示,低温组肉鸡PHS发生率(15.00%)极显著高于对照组(1.67%)(P<0.01);低温组肉鸡肺小动脉壁c-mycmRNA的表达从22日龄开始较对照组明显增加(P<0.05),从29～50日龄较对照组极显著升高(P<0.01)。结果表明,环境低温明显诱发了肉鸡肺小动脉壁c-myc mRNA的表达,且c-myc mRNA的表达参与了环境低温诱发的肉鸡PHS的发生发展。 相似文献
5.
L-精氨酸对肺动脉高压肉鸡肺小动脉平滑肌细胞凋亡的影响 总被引：5，自引：1，他引：4
将240羽14日龄艾维茵-2000商品代肉鸡于14d时随机等分为常温对照组（NT组），低温组（LT组）和低温加L-精氨酸组（LA），白14d起，LT和LA组舍内温度从28℃以1～2℃／d的速度下降，至21d降至12～14℃，并维持到试验结束。此外，LA组自14d起在饲料中按100mg／kg剂量添加L—Arg，直至试验结束。记录肺动脉高压综合征（PHS）发病率，并分别于24、32、39和45d测定右心室／全心室质量比（RV／TV）、血浆NO、肺小动脉管壁面积／管总面积（WA／TA）和平均中膜厚度（mMTPA），并用原位缺口末端标记法（TUNEL法）对肺小动脉凋亡平滑肌细胞进行染色和计数。结果：LT组肉鸡PHS发病率、RV／TV、mMTPA和WA／TA值较NT组升高（P〈0．05）；LA组肉鸡PHS发病率较LT组降低（P〈0．05），mMTPA和WA／TA值与LT组相比呈下降趋势，在32d时显著降低（P〈0．05）；LT组血浆N0浓度总体上与NT组差异不显著（P〉0．05），仅在39d时降低（P〈0．05），而LA组血浆N0浓度自32d时起较NT和LT组显著升高（P〈0．05）；LA组肉鸡肺小动脉平滑肌凋亡细胞百分率较NT组和LT组均显著升高（P〈0.05），但LT组与NT组之间相比无显著差异（P〉0．05）。上述结果表明，L-Arg／NO通过促进肺小动脉平滑肌细胞凋亡，从而在一定程度上抑制了肺血管重构的形成。 相似文献
6.
静脉注射纤维素粒子复制肉鸡肺动脉高压模型,观察肺小动脉中膜5-羟色胺(5-HT)表达和肺小动脉管壁病理形态学变化,探讨5-HT与肺血管重构的关系。80羽科宝肉鸡分为对照组(n=30)和试验组(n=50)。20日龄时,试验组每羽鸡静脉注射0.3 mL的纤维素悬液;对照组每羽鸡静脉注射等体积生理盐水。记录肺动脉高压综合征(PHS)发病率,并分别于21、28、35、42 d从各组随机抽样,测定右心室/全心室质量比(RV/TV)、红细胞压积(PCV)、血红蛋白(Hb)、肺小动脉管壁面积/管总面积(WA/TA)、平均中膜厚度(mMTPA)和肺厚壁末梢血管百分比(TWPV%);采用免疫组化方法标记5-HT,并用病理图像分析软件检测肺小动脉5-HT的量。结果表明:试验组肉鸡PHS发病率显著高于对照组(P<0.05);RV/TV值在35、42 d时显著升高(P<0.05);PCV在28、35 d时显著升高(P<0.05);Hb值在35 d时显著升高(P<0.05);血管mMTPA、WA/TA和TWPV%在35、42 d时均显著升高(P<0.05);肺小动脉5-HT含量升高,在各时间点均差异显著(P<0.05),且5-HT含量... 相似文献
7.
高钠所致肺动脉高压肉鸡肺细小动脉病理改变的图象分析 总被引：17，自引：3，他引：14
240羽健康AA肉鸡随机均分为试验1组，试验2组和对照组，从8日龄起分别饮用含Na^ 为0.06%、0.12%和0.0%的饮水，其它饲养管理条件相同，分别于12、19、30、34、39日龄抽取各组参试鸡，以右心室（Right ventricle,RV)与全心室（Total ventrcle,TV)的重量比（RV／TV）作为判定肺动脉高压的依据，用图象分析仪对肺细小动脉病理变化作定量检测。结果表明：34、39日龄时，试验1组和试验2组管壁面积／管总面积和中膜厚度占外径百分值明显大于对照组，肺小动脉密度明显低，其RV／TV值均大于0.25，表明试验组肉鸡发生了肺动脉高压。由此可见，由高钠引起肉鸡肺细小动脉血管重构的病变可能参与了肺动脉高压的形成过程。 相似文献
8.
试验旨在研究环境低温诱发肉鸡肺血管重塑过程中肺小动脉血管平滑肌细胞c-Myc蛋白的表达变化,初步探讨肉鸡肺血管重塑的发生机制.120只雄性AA商品代肉鸡15日龄时随机分为对照组((22±1.5)℃)条件下饲养)和低温组((11±2)℃条件下饲养).15～50日龄,每周每组随机取6只,取肺组织做石蜡切片,Weigert-间苯二酚复红染色,观察并测定m管重塑情况;采用免疫组织化学方法榆测肺动脉血管平滑肌细胞c-Myc蛋白表达,并对其进行半定量化.结果显示:(1)低温组肉鸡肺小动脉结构从36日龄开始较对照组发生了明显的重塑(P<0.01或P<0.05);(2)低温组肉鸡肺小动脉血管平滑肌细胞c-Myc蛋白表达从29日龄开始较对照组明显增加(P<0.01).结果表明:低温叫显诱发了肉鸡肺小动脉平滑肌细胞c-Myc蛋白的表达,且参与了肉鸡肺血管重塑的发生发展. 相似文献
9.
本试验旨在研究高盐诱发肉鸡腹水综合征（AS）过程中肺小动脉壁癌基因c-jun mRNA表达的规律，初步探讨肺小动脉壁癌基因c-jun mRNA表达在AS发生过程中的可能作用。将100只1日龄商品代AA雄性肉仔鸡常规育雏，8日龄起随机分为对照组和高盐组（饮水中添加0．30％氯化钠）。分别在15、22、29、36、43、50日龄时每组随机取6只鸡的肺组织制备切片，以原位杂交法结合图像分析法测定肺小动脉壁癌基因c-jun mRNA的表达。结果表明：对照组肉鸡生长发育过程中肺小动脉壁癌基因c-jun mRNA表达呈现动态变化，22日龄是其表达高峰。15、29、36日龄时高盐组各级肺小动脉壁c-jun mRNA相对含量极显著高于对照组（P〈0．01）。43、50日龄时高盐组仅外径20～50μm肺小动脉壁c-jun mRNA相对含量极显著高于对照组（P〈0．01）。提示高盐促进了肉鸡肺小动脉壁癌基因c-jun mRNA表达，尤其是在外径20～50μm的肺小动脉壁。肺小动脉壁癌基因c-jun mRNA的过度表达可能参与了高盐诱发AS的过程。 相似文献
10.
低温诱发肉鸡腹水综合征发生过程中肺血管重塑与肺动脉高压的关系 总被引：1，自引：0，他引：1
将160只15日龄雄性AA商品代肉鸡随机分为对照组((22±1.5)℃)和低温组((11±2)℃)。15~50日龄,每组每周随机取6只,以右心导管法直接测定肺动脉压(PAP),并取肺组织做石蜡切片进行Weigert-间苯二酚复红染色,分析肺血管重塑情况。50日龄时统计整个饲养过程中肉鸡腹水综合征(AS)发生率。结果显示,低温组肉鸡AS发生率(18.75%)极显著高于对照组(1.25%)(P<0.01);低温组肉鸡PAP从22日龄开始较对照组明显升高(P<0.01或P<0.05);20~50、50~100、100~200μm肺动脉结构分别从36、43、43日龄开始较对照组发生了明显的重塑(P<0.01或P<0.05)。结果表明,低温诱发肉鸡AS过程中出现了明显的PAP升高和肺血管重塑,且肺动脉高压(PH)促进了肺血管重塑,肺血管重塑加剧了PAP升高。 相似文献
11.
OBJECTIVE: Hypoxaemia accompanies dorsal recumbency in the horse and frequently complicates general anaesthesia. The physiology associated with this phenomenon is poorly understood. One possible cause of poor tolerance to dorsal recumbency is an absent or reduced response to hypoxic pulmonary vasoconstriction (HPV). This study compared the HPV response in isolated pulmonary artery vessels from equivalent regions of equine and bovine lung. ANIMALS: Equine and bovine, in vitro study. MATERIALS AND METHODS: Equine and bovine pulmonary arteries were removed from the lungs of euthanased horses and cattle. Measurements of isometric tension were made on isolated rings of pulmonary vessels at 37 degrees C in a Krebs' saline solution. Hypoxia was induced by bubbling with a nominally 0% O(2) gas mixture. RESULTS: A significant HPV response was observed above a baseline tension induced by phenylephrine (PE; 0.3 microm) or 5-hydroxytryptamine (5-HT; 0.1 microm). The HPV response in equine pulmonary vessels was approximately 33% less than the response observed in equivalent bovine vessels (equine 196 +/- 20%versus bovine 290 +/- 32%; p < 0.05). Removal of the endothelium (by rubbing the luminal surface) significantly reduced but did not abolish the HPV response. Incubation with the nitric oxide (NO) synthase inhibitor N-nitro-l-arginine methyl ester (L-NAME; 100 microm), or COX-1/COX-2 inhibitor indomethacin (10 microm) markedly attenuated the HPV response in equine vessels. CONCLUSIONS: These results suggest that a significant HPV response exists in isolated equine pulmonary vessels; a component of this response requires a functional endothelium. Inhibition of cyclooxygenase and NO synthase attenuated the response, suggesting the involvement of a COX product and/or NO in mediating this effect either directly or indirectly. Alternatively, a non-COX related action of the nonsteroidal anti-inflammatory drug, indomethacin, may be involved. 相似文献
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JOOHYUN JUNG JINHWA CHANG SUNKYOUNG OH JUNGHEE YOON MINCHEOL CHOI 《Veterinary radiology & ultrasound》2010,51(3):288-293
This study was performed to characterize pulmonary embolism with computed tomography pulmonary angiography in experimental pulmonary embolism and heartworm infected dogs. In the experimental group, there were pulmonary changes after pulmonary embolism induction as follows: hypoattenuating round filling defects in pulmonary arteries, arterial dilations with straight and abrupt cut‐off appearances in the pulmonary embolism regions, pulmonary infarctions, a cavity formation and spontaneous pneumothorax, and emboli migration. In the heartworm‐infected group, three out of eight dogs developed pulmonary embolism, especially in the right caudal arteries. Arterial dilations with typical tortuosity were also identified, mainly in the right caudal arteries in five dogs. Computed tomography pulmonary angiography can be an important imaging modality in the diagnosis of pulmonary embolism and the evaluation of pulmonary arterial and parenchymal changes in dogs. 相似文献
13.
Thoracic radiographs of 21 dogs with necropsy-confirmed pulmonary thrombosis or embolism (PTE) were reviewed. Two major lung patterns were seen: (1) regional oligemia, giving the impression of a hyperlucent zone; (2) alveolar pulmonary infiltrate, indicating hemorrhage or infarction. Hemorrhage and infarction could not be differentiated radiographically. Other common findings were attenuation or loss of visualization of a lobar artery or lobar vein and pleural effusion, particularly with infarction and cardiac disease. PTE was often associated with renal disease (glomerulonephritis, amyloidosis), septic processes, pancreatitis, systemic venous or right heart thrombosis, cardiac insufficiency, and hypercorticism. 相似文献
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Donald E. Thrall Michael H. Goldschmidt Richard J. Clement Bernard Goldsmith 《Veterinary radiology & ultrasound》1980,21(3):104-107
A 9-year-old dog was presented with generalized extensive pulmonary mineralization associated with exertional dyspnea and cyanosis. The differential diagnosis for the pulmonary mineralization included metastaticand dystrophic pulmonary calcification, atypical pulmonary neoplasia, alveolar microlithiasis, idiopathic pulmonary mineralization, and idiopathic pulmonary ossification. The dog was euthanized at the owner's request. The histologic diagnosis was idiopathic pulmonary ossification. No previous report of generalized extensive idiopathic pulmonary ossification was found. Idiopathic pulmonary ossification occurs in man, usually involves a limited area of lung, and is functionally unimportant. The pulmonary ossification in the dog reported here was generalized and associated with severe pulmonary dysfunction. The disease in man and that in the dog in this report do not appear to be directly comparable. 相似文献
15.
扎鲁司特对低温诱发的肉鸡肺动脉高压的影响 总被引：1，自引：1，他引：1
将60只雄性艾维茵商品代肉鸡常规育雏，17日龄随机分为3组：常温对照组(常温组)、低温模型组(低温组)和低温扎鲁司特组(扎鲁司特组)。各组于处理后14d(31日龄)和21d(38日龄)分别用右心导管法及直接导管法测定扎鲁司特对肺动脉压(PAP)和股动脉压(FAP)的影响，同时测定红细胞压积(PCV)和腹水心脏指数(AHI)。结果：(1)在低温环境的早期，扎鲁司特使肉鸡肺动脉收缩压和舒张压均升高，后期仅使舒张压升高；(2)扎鲁司特使PCV升高，增加了血液黏性阻力；(3)扎鲁司特使AHI升高，促进右心肥大；(4)扎鲁司特对股动脉压无显著性影响。可见扎鲁司特促进了肉鸡肺动脉高压综合征的发生发展。 相似文献
16.
Maria G. Evola Elijah F. Edmondson Jean K. Reichle David S. Biller Colleen W. Mitchell Alejandro Valdés‐Martínez 《Veterinary radiology & ultrasound》2014,55(2):133-140
Pulmonary fibrosis is a progressive fatal interstitial lung disease that is often idiopathic, occurs in multiple species, and may be caused by a number of inciting factors. The purpose of this retrospective, multicenter study was to describe the radiographic and histopathologic characteristics of idiopathic and induced pulmonary fibrosis in a group of cats. Cats with thoracic radiographs and histopathologically confirmed pulmonary fibrosis were recruited using the American College of Veterinary Radiology list serve. A board‐certified veterinary radiologist and diagnostic imaging intern reviewed radiographs and recorded characteristics by consensus. Findings from additional imaging modalities were also recorded when available. All histopathology samples were re‐reviewed by a veterinary pathology resident. A total of nine cats met inclusion criteria. All patients had a broad range of radiographic characteristics that included broncho‐interstitial pattern, alveolar pattern, pulmonary masses, pulmonary bullae, pleural effusion, and cardiomegaly. Cats with available echocardiographic studies had characteristics that included right ventricular dilation and hypertrophy and pulmonary arterial hypertension interpreted to be secondary to primary lung disease. Cats with available CT studies had characteristics that included focally increased soft tissue attenuation, masses, and ventral consolidation that exhibited no improvement with dorsal versus ventral recumbency. Histopathology showed pulmonary fibrosis, type II pneumocyte hyperplasia, and smooth muscle hypertrophy in all patients. Epithelial metaplasia was present only in one patient. Findings from the current study indicated that cats with pulmonary fibrosis have highly variable radiographic characteristics and that these characteristics may mimic other diseases such as asthma, pneumonia, pulmonary edema, or neoplasia. 相似文献
17.
This study was designed to determine whether calcium antagonists, diltiazem and nifedipine, can depress low temperature‐induced pulmonary hypertension (PH) in broilers (also known as ascites) and to characterize their efficacy on hemodynamics and pulmonary artery function. Chicks were randomly allocated into six experimental groups and orally administered with vehicle, 5.0 mg/kg body weight (BW)/12 h nifedipine or 15.0 mg/kg BW/12 h diltiazem from 16 to 43 days of age under low temperature. The mean pulmonary arterial pressure (mPAP), the ascites heart index (AHI), the erythrocyte packed cell volume (PCV) and the relative percentage of medial pulmonary artery thickness were examined on days 29, 36 and 43. The data showed that administration of diltiazem protected broilers from low temperature‐induced pulmonary hypertension and vascular remodeling. Although nifedipine prevented mPAP from increasing during the early stage, it did not suppress the development of PH during the late stage and did not keep heart rate (HR), PCV, AHI and the thickness of pulmonary small artery smooth muscle layer at the normal levels. Taken together, our results showed that diltiazem can effectively prevent low temperature‐induced pulmonary hypertension in broilers with fewer side‐effects and may be a potential compound for the prevention of this disease in poultry industry. 相似文献
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Aline M. Ambrosio Tatiana P.A. Carvalho-Kamakura Keila K. Ida Barbara Varela Felipe S.R.M. Andrade Lara L. Facó Denise T. Fantoni 《Veterinary anaesthesia and analgesia》2017,44(2):254-263