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莱芜黑山羊松果体超微结构及5-羟色胺分布的季节性变化 总被引:1,自引:0,他引:1
应用5-羟色胺(5-HT)免疫组织化学方法和电镜技术,对莱芜黑山羊4个季节的松果体进行了研究.结果显示:(1)松果体内有大量5-HT阳性的松果体细胞及纤维;(2)松果体5-HT免疫阳性细胞面积以冬季最大,且与其他3个季节差异极显著(P<0.01);夏季最小;春秋季之间无明显差异(P>0.05).4个季节5-HT阳性细胞的光密度差异不大(P>0.05).松果体中5-HT阳性面积占总面积的比值.春、秋季相差不大(P>0.05),夏、冬季差异极显著(P<0.01);(3)松果体细胞有明细胞和暗细胞之分,2种细胞超微结构明显不同.明细胞胞核较大,常染色质多,粗面内质网(RER)、游离核糖体丰富,高尔基复合体的扁平囊泡层数较多,线粒体嵴发达,糖原较少;暗细胞的异染色质多,RER和游离核糖体较少,高尔基复合体的扁平囊泡层教少,线粒体嵴缺乏,糖原较丰富.结果提示,明细胞功能较暗细胞活跃;(4)不同季节松果体内明、暗细胞的数量不同,冬季为明细胞,夏季为暗细胞,春、秋2季2种细胞皆有,表明季节是影响松果体结构和功能活动的重要因素. 相似文献
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鸡中脑内5-羟色胺神经元分布的免疫组化研究 总被引:1,自引:0,他引:1
5-羟色胺(5-Hydroxytryptamine,5-HT)是经典的中枢神经递质,对镇痛起很大作用。它在中枢系统中存在是由Twarog和Page在1953年用生物化学方法证明的,随着研究方法的进步,很多学者为此进行了深入的研究,但大多是关于哺乳动物的,在禽类则很少见报道。此试验用SP法研究了5-HT神经元胞体在鸡中脑内分布,从而为神经生理、神经内分泌及神经药理等神经学科的研究奠定基础。 相似文献
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应用5-HT免疫组织化学染色法,对冬春两季的莱芜黑山羊松果体进行了观察比较,以探讨松果体与下丘脑垂体-性腺轴的关系。结果显示,莱芜黑山羊松果体内存在大量5-HT阳性的松果体细胞及5-HT纤维;冬季松果体阳性细胞面积及阳性面积比都明显大于春季(P〈0.01),平均光密度在冬、春季间无明显差异(P〉0.05)。表明莱芜黑山羊松果体的功能活动呈现季节性变化,与羊的繁殖活动关系密切。 相似文献
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目前犬瘟热发病表现腹泻症状的病犬占很高的比例,而犬瘟热疾病表现消化道症状的病理机制尚未完全阐明。5-羟色胺(5-HT)是消化系统内重要的神经递质和调节物,而且90%以上分布于肠道,在腹泻性的疾病中可能起着巨大作用。为探讨犬瘟热病犬胃肠道5-HT细胞的变化及其在病理中的作用,取5只消化道型犬瘟热病犬胃肠组织,常规切片,SP免疫组织化学技术对病犬胃肠道内5-HT胺细胞进行定位,观察其形态特征与分布密度。结果显示,胃肠道内5-HT胺细胞呈现明显多形性,大小不均一。胃部的5-HT胺细胞主要集中在胃腺上皮细胞之间;肠道内的5-HT胺细胞主要分布于肠上皮基底部、肠道黏膜上皮细胞之间。在消化道型犬瘟热病犬胃肠道中5-HT胺细胞数量明显增多,在胃中5-HT胺细胞的密度在胃幽门处显著高于胃部其他部位,在肠道内结肠处的分布数量显著低于其他肠段,在整个胃肠道内呈不规则波浪形分布,并且5-HT胺细胞密度与腹泻程度明显相关。试验结果提示5-HT胺细胞可能参与犬瘟热发病过程,其增高是由于犬瘟热病毒或者继发感染的其他病原菌破坏消化道的正常组织结构刺激胃肠道内的5-HT胺细胞代偿性增加。 相似文献
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5-羟色胺是一种广泛分布于哺乳动物组织内且高度保守的神经信号传导物质。5-羟色胺在动物的健康中扮演着关键的角色,在多种生理功能的调节中发挥着重要作用,尤其是在肠道相关功能调节中。以往研究集中于5-羟色胺在中枢神经系统中的作用。5-羟色胺与肠道微生物菌群、肠道疾病和免疫也有着密切关系,然而却鲜有学者进行系统总结。本文将综述5-羟色胺与肠道疾病、肠道微生物菌群及免疫的相互作用。探讨这些复杂关系将有助于人们更好地理解相关宿主疾病的发病机制,为下一步的深入研究提供参考。 相似文献
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家禽动眼神经核簇的细胞构筑及其5-HT神经元的分布 总被引:1,自引:0,他引:1
用Nissi染色法和免疫组化SP法研究鸡、北京鸭、鸽子的动眼神经核簇细胞构筑及5-羟色胺神经元分布情况,结果表明:北京鸭的动眼神经核簇系由动眼神经核、E—W核和前背外侧核3个部分所构成,而在鸡和家鸽仅包括动眼神经核和E—W核。他们的核团形态和细胞构筑基本相同。观察到5-HT阳性神经元在鸡、鸭和鸽子动眼神经核及鸡E—W核内的分布,而在鸭和鸽子的E—W核和鸭的前背外侧核内却未见分布。动眼神经核5-HT阳性神经元的数量较多,在各个亚核的分布均匀,胞体着色较深。 相似文献
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B R Roberts BSc PhD A Livingston BVetMed BSc PhD A E Waterman-Pearson BVSc PhD DVA DipECVA 《Veterinary anaesthesia and analgesia》2000,27(2):73-81
Objectives To examine the role of spinal 5‐hydroxytryptamine (5‐HT) binding sites in nociceptive processing in conscious sheep and to study the role of 5‐HT agonists in mediating analgesia. Study design Prospective controlled study. Animals Nine adult healthy female sheep (Swaledale, Swaledale‐cross or Clun Forest) weighing 45–65 kg. Methods Intrathecal (IT) catheters were implanted at the cervical (n = 5) or lumbar (n = 4) level of the spinal cord under general anaesthesia. At least 1 week later, and at 1 week intervals thereafter, the effects of intrathecal Ringer's solution (control), xylazine (100 µg), 5‐HT creatinine sulphate (200, 400 and 800 µg), RU24969 (200 µg), α‐Methyl‐5‐HT and 1‐(3‐Chlorophenyl)‐biguanide (CPBG) on the mechanical nociceptive threshold (MT) were studied. Results were plotted as mean variable versus time curves. Areas under portions of the curves (0–30 and 0–60 minutes) were measured and expressed as mean ± standard error. Differences between values for control and drug trials were examined using the two‐tailed Student's t‐test. Results Baseline values of MT were lower on the hind limbs than on the forelimbs. Intrathecal Ringer's solution did not alter MT in the cervical or lumbar region. Xylazine (100 µg) produced a characteristic elevation in MT between 5 and 60 + minutes. Lumbar IT injection of 5‐HT (800 µg) raised the MT more than cervical injection, while cervical injection of RU24969 (200 µg) raised the MT more than lumbar administration. Cervical IT injection of α‐Me‐5‐HT (500 µg) produced a marked and significant increase in MT while lumbar application had no effect. CPBG (500 µg) injection caused no significant effect on MT with either cervical or lumbar applications. Conclusions The activation of 5‐HT1 and 5‐HT2 receptors particularly at the cervical level appears to be involved in spinal nociceptive processing in the sheep. Clinical relevance These effects, which lasted about 60 minutes, may have an implication in the development of new analgesic strategies for animals. 相似文献
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本文研究了吡喹酮和硝硫氰醚与日本血吸虫拟似神经递质 5-羟色胺间的关系。以吡喹酮 ( 5× 1 0 - 7mol/ L和 5× 1 0 - 8mol/ L )、硝硫氰醚 ( 1 0 - 4mol/ L和 1 0 - 5mol/ L )分别培养日本血吸虫成虫 4h和 8h ,反相离子对高效液相法测定其体内 5-HT的含量变化。结果显示 :吡喹酮和硝硫氰醚对日本血吸虫体内 5-HT等含量的影响与对照相比均无显著性差异。表明二者抗虫作用似不通过影响虫体 5-HT的生物合成和降解。 相似文献
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为研究5-羟色胺(5-HT)受体基因在不同猪种的表达及其与肉质的关系,试验选取淳安花猪与杜长大三元猪各12头,同时饲喂,达上市体重时分别屠宰,测定胴体、肉质性状及肌肉、脂肪中的5-HT受体基因表达量。结果表明:淳安花猪、杜长大三元猪的平均屠宰体重分别为88.1、102.4kg;淳安花猪的板油率、背膘厚、肌内脂肪等指标均显著高于杜长大三元猪(P〈0.05);屠宰率、眼肌面积杜长大三元猪显著高于淳安花猪(P〈0.05)。5-HT2A、5-HT7受体基因在2个猪种脂肪组织中的表达量均显著高于肌肉组织(P〈0.05),杜长大三元猪的肌肉中5-HT2A、5-HT7表达量显著低于淳安花猪(P〈0.05),而脂肪中表达量两猪种间差异不显著。5-HT2A、5-HT7受体基因表达量与屠宰肉质指标之间基本呈负相关,尤其是肌肉中的5-HT2A表达量,呈较强负相关(杜长大三元猪)或显著负相关(淳安花猪)。研究初步认为,5-HT受体基因在中外猪种之间存在表达差异,并与屠宰肉质性状具有相关性。 相似文献
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为了解中国优良地方猪种梅花猪胃肠道内分泌细胞的分布与形态特征,本试验选取6头30日龄断奶健康梅花仔猪,在相同条件下饲养至65日龄,所有仔猪饲喂相同日粮,自由采食饮水。试验结束时,收集仔猪胃肠道各段组织样品,应用免疫组织化学方法观察3种胃肠道内分泌激素5-羟色胺(5-HT)、胃饥饿素(ghrelin)和胰高血糖素样肽-1(GLP-1)免疫阳性细胞的分布及形态特征,并对阳性细胞密度进行分析。结果显示,梅花猪的肠道不同部位(十二指肠、空肠、回肠和结肠)均存在5-HT阳性细胞,主要位于肠上皮组织中,呈锥形、圆形、梭形等形态,可分为开放型和闭合型,其中十二指阳性细胞肠密度显著高于其他肠段(P<0.05);梅花猪的胃肠道不同部位均有Ghrelin阳性细胞,阳性细胞密度也是随胃肠道走向递减,胃腺体部密度最高;梅花猪的肠道不同部位均有GLP-1阳性细胞,阳性细胞密度沿肠道走向呈抛物线分布,其中回肠数量最多。本试验结果为进一步探究梅花猪胃肠道生理奠定了基础。 相似文献
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CHEN Zhong-jian WU Xiu-ju ZHU Cui ZHANG Wei-na LIANG Rui YAN Shi-juan SU Hao-xian CHEN Zhuang 《中国畜牧兽医》2017,44(5):1498-1507
In order to analyze the distributions and densities of endocrine cells in the gastrointestinal tract of Meihua pig (an elite native breed of Guangdong province, China), 6 healthy piglets weaned at 30 days of age were fed with the same diet till 65 days of age. At 65 days of age, different sections of the gastrointestinal tract of each piglet were collected, and the features and densities of 5-hydroxytryptamine (5-HT), ghrelin and glucagon-like peptide-1 (GLP-1) immunopositive cells were detected by immunohistochemistry. The results showed that the 5-HT positive cells distributed at the epithelial layer throughout the intestinal tract (duodenum, jejunum, ileum and colon) with a variety of features (e.g. cone, round, spindle), and they could be classified into either open-shape or closed-shape type, the density of 5-HT positive cells in duodenum was highest; The ghrelin positive cells were located along the gastrointestinal tract (gastric glands, pylorus, duodenum and jejunum) with both open-shape and closed shape, and its density decreased along the tract with most cells in gastric glands; The GLP-1 positive cells were observed along the intestinal tract, but its density increased from duodenum to ileum and then decreased in colon. This study might provide supporting data for further study of the gastrointestinal physiology of Meihua pig. 相似文献