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1.
目的:探讨血管内皮细胞生长因子(VEGF)在不同胎龄的正常人胎儿胃黏膜的表达及其意义。方法:应用免疫组织化学SP法检测VEGF在20例12~34周人胎胃黏膜的表达。结果:VEGF在20例人胎胃黏膜上皮细胞和腺上皮细胞中均有表达,免疫反应产物分布于细胞质,胞核为阴性,在胃黏膜上皮细胞中的表达较腺上皮细胞弱。经与HE染色的邻片比较,腺上皮细胞中的免疫反应阳性细胞为壁细胞。随着胎儿的发育,胃腺内VEGF呈免疫反应阳性的壁细胞数目增多,免疫反应强度无明显变化。结论:VEGF在不同胎龄的人胎儿胃黏膜组织中均有表达,提示VEGF与人胎儿胃黏膜的生长发育有重要的调节作用。  相似文献   

2.
目的 探讨胃和大肠腺上皮分化癌的组织学类型及组织学分级变异规律。方法 对233例进展期胃和大肠腺上皮分化癌的根治术标本进行回顾性观察分析。结果 233例胃和大肠腺上皮分化癌的在向固有肌层浸润时,116例发生组织学分型或组织学分级变异而呈两种及两种以上组织学构型,117例组织学构型无变异。结论 胃和大肠腺上皮分化癌的组织学构型变异与其生长微环境改变可能有关。  相似文献   

3.
目的探讨性激素受体在睑板腺和Zeis腺的定性和定位分布。方法采用免疫组织化学技术和DAB显色方法显示雌激素受体(ER)、孕激素受体(PR)、雄激素受体(AR)在睑板腺和Zeis腺上皮的表达。结果胎儿4个月睑板腺和Zeis腺上皮呈ER、PR、AR阳性;而儿童至成人组睑板腺和Zeis腺上皮呈ER、AR阳性。各种性激素受体定位同时出现在细胞膜、细胞质和细胞核。ER在睑板腺和Zeis腺上皮阳性表达率在年龄组间比较,均无显著性差异(P〉0.05);PR在睑板腺和Zeis腺上皮阳性表达率在年龄组间比较,均有显著性差异(P〈0.05):AR在睑板腺上皮阳性表达率在年龄组间比较无显著性差异(P〉0.05),而Zeis腺上皮阳性表达率则有显著性差异(P〈0.05)。ER、PR、AR阳性表达率在胎儿组性别间比较和ER、AR阳性表达率在儿童至成人组性别间比较均无显著性差异(P〉0.05)。结论胎儿4个月睑板腺和Zeis腺上皮ER、PR、AR即有表达。出生后睑板腺和Zeis腺上皮仅存在ER和AR,以ER为主。ER、PR、AR定位在细胞膜、细胞质和细胞核。  相似文献   

4.
目的观察P63蛋白在胎儿及育龄期子宫内膜上皮的表达。方法12~39周龄的胎儿和育龄期子宫内膜标本各20例。采用免疫组织化学SP法检测子宫内膜P63蛋白的表达情况。结果胎儿子宫内膜自12周起可检测到P63蛋白阳性细胞,主要定位于表面上皮,随孕龄增加表达逐渐减弱;育龄期子宫内膜仅在1例增生期子宫内膜检测到P63阳性细胞,主要定位于腺上皮散在的零星细胞,表达强度低于胎儿子宫内膜组织。结论P63蛋白与子宫内膜上皮细胞的成熟程度、分化潜能与增殖有关。  相似文献   

5.
梁文妹  王琳 《解剖学报》2005,36(1):110-111
目的 探讨胰岛淀粉样多肽(IAPP)在人胎胃的表达和定位。方法 免疫组织化学SABC法对12例11~20周人胎胃体部IAPP免疫反应(IR)细胞进行定位研究。结果 人胎11周,胃黏膜中已有IAPP-IR细胞,主要定位于胃底腺。14~20周,胃黏膜中IAPP-IR细胞数量逐渐增多,免疫反应显色也逐渐加深。经与HE染色的邻片比较,部分IAPP-IR细胞与壁细胞定位一致。结论 IAPP-IR细胞在人胎儿期已存在于胃体部。  相似文献   

6.
钙依赖细胞粘附分子与胃癌的生长方式和分化程度…   总被引:4,自引:0,他引:4  
蔡建春  江绍基 《中华病理学杂志》1994,23(3):132-134,T030
用免疫化方法研究46例新鲜胃癌标本中钙依赖细胞粘附分子的表达,发现E-CD在61%胃癌中呈减少至消失表达;而在正常胃小凹上皮,慢性胃炎上皮及肠化腺休事则呈均质保留表达;在77%闵氏膨胀型胃癌中呈保留表达;在100%闵氏浸润型中呈减少至消失表达;单个分散状态的癌细胞E-CD常常消失,此表达与不同分化程序胃癌的表达一致,表明钙依赖粘附分子的存在与否,可能决定着胃癌的生长方式和分化程度。  相似文献   

7.
目的观察成年大鼠乳腺不同发育时期CD24阳性表达的乳腺上皮小亮细胞部位、数量的变化。方法制备成年大鼠乳腺不同发育时期(选取静止期、孕期、哺乳期、退化期)组织标本,采用免疫组织化学和光镜技术检测CD24的表达。结果CD24在导管小亮细胞中的染色程度普遍高于腺泡;相比于静止期和退化期,CD24更多地表达于孕期和哺乳期的小亮细胞;静止期和退化期表达无显著性差异(P〉0.05);孕期和哺乳期表达也无显著性差异(P〉0.05)。结论CD24蛋白参与了正常成年大鼠乳腺组织的发育过程,且可能是鉴定乳腺干细胞(MaSCs)及观察MaSCs发育与分化过程的重要分子。  相似文献   

8.
人胎胃壁瘦素及瘦素受体的免疫组织化学   总被引:3,自引:0,他引:3  
目的:对不同胎龄胎儿胃壁组织发育和胃壁内瘦素及瘦素受体进行定性和定位观察。方法:采用HE和免疫组织化学SABC染色方法。结果:胚胎13w,可见有胃小凹和胃腺。15w时,胃壁具有4层结构。随胎龄增长,胃壁和胃腺逐步发育完善。胚胎13w时,胎儿胃粘膜上皮和胃腺内壁细胞呈瘦素及瘦素受体免疫反应中等阳性,免疫反应产物分布于胞质,而胞核为阴性。随着胃腺的发育,呈免疫反应阳性的壁细胞数目增多。在胎儿整个发育过程中,各胎龄间胃腺瘦素及瘦素受体的免疫反应强度无明显变化。结论:人胚胎发育时期,在胃上皮和胃腺中有瘦素及瘦素受体的表达,推测它们对胎儿的生长发育起重要的调节作用。  相似文献   

9.
MUC1正常情况下主要表达于多种组织、器官中上皮细胞近管腔或腺腔面,呈顶端分布或极性分布,对正常的上皮起润滑和保护作用,同时还介导信号转导和细胞黏附。在肿瘤组织中MUC1的表达多出现量和质的改变,并与肿瘤的浸润、转移及预后相关。有研究表明它可作为肺癌细胞的分化标志,随着肺癌细胞分化表型趋于成熟,其表达逐渐下降。因此,MUC1可能成为一种非常有价值的肿瘤标志物,用于肺癌的临床诊断、治疗和预后的判断。  相似文献   

10.
目的探讨RhoA在小鼠胚胎植入过程中的表达及其生物学作用。方法取胚胎围种植期(D0至D6天)昆明小鼠子宫作切片,用免疫组织化学方法和图像分析方法对RhoA在子宫内膜中的表达进行定位和半定量分析。结果RhoA主要分布于小鼠子宫内膜腺上皮、腔上皮和基质细胞。受精后,RhoA在子宫内膜的含量高于未孕组(P<0.05);受精后第4d(植入期),小鼠子宫内膜腔上皮中RhoA的含量明显增多,明显高于未孕及植入前各时间组(P<0.05),并逐渐向基质细胞延伸,第5d广泛分布在蜕膜细胞和基质细胞,到第6天大部分子宫内膜基质区域及腺上皮的细胞中有大量的RhoA分布。RhoA在小鼠子宫内膜组织中的表达强度在受精后呈逐渐上升趋势。结论①RhoA可能参与了胚胎的种植和子宫内膜容受性的建立;②还可能间接参与植入后胚胎的滋养层扩展、分化及子宫内膜蜕膜化反应。  相似文献   

11.
Laminins may play important roles in gastric gland development due to the differential localization of their α chains in human fetal fundic (oxyntic) mucosa. To extend this hypothesis, the current investigation was undertaken to compare the anatomical and cellular distribution of epithelial integrin subunits with those of laminin α chains in the human stomach at different ages (8–22 weeks of gestation) using indirect immunofluorescence. In the body, fundus and antrum regions, the β1 and α6 subunits were associated with the entire epithelium at all developmental stages in the same way as laminin chains (α1/α5) detected with 4C7 monoclonal antibody. By contrast, the α3 and β4 subunits of α3β1 and α6β4 integrins together with the laminin α3-chain were concentrated in the surface and foveolus compartments composed of differentiating mucous cells. Most importantly, the α2 integrin subunit was expressed in a rather complex pattern: (1) it was located at the base and at cell-cell boundaries of surface/foveolar epithelium, (2) was specifically repressed in differentiating parietal cells, and (3) its expression increased in maturing glands, where it became concentrated at the basal pole of epithelial cells simultaneously exhibiting a strong reactivity for laminin-2 (α2-chain). Taken altogether, our observations provide new evidence for the implication of different laminins and their receptors in the development of all human gastric epithelial lineages, surface mucous cells or glandular cells. The coordinated expression of α2 and α3 integrin subunits as well as the cellular re-distribution of α2β1 integrin likely represent key events for the differentiation of glandular secretory cell types, especially maturing chief cells responsible for the synthesis/secretion of gastric digestive enzymes in fundic-type glands. Accepted: 26 March 2000  相似文献   

12.
The normal and interferon-gamma induced expression of class II MHC antigens was investigated immunohistologically in the digestive system of LEW rats. In the normal state class II molecules were present in interstitial dendritic cells, B lymphocytes and epithelial cells. Epithelial class II expression was restricted to enterocytes in certain portions of the small intestine and to some duct epithelia in salivary glands. After continuous intravenous infusion of interferon-gamma (IFN-gamma) for 3 days, class II MHC antigens were induced in large vessel endothelium and in the surface epithelia of the tongue, oesophagus and proventricle. In the gastric glands class II molecules appeared in mucous neck cells and in parietal cells, while adjacent mucous surface cells and chief cells did not acquire class II reactivity. All enterocytes, including the previously negative colonic epithelium, were induced to express class II antigens. In the salivary glands class II antigens appeared in all duct epithelia. Serous acinar cells were induced in the parotids, but in the submandibular glands and in the pancreas the serous gland epithelium stayed negative. Our study thus shows that the effects of IFN-gamma on class II MHC antigen expression in vivo depend on the differentiation pathway of the individual cell. The normal distribution in rats suggest that class II MHC antigens may play a role in peptide transport across specialized epithelia. It remains to be determined whether such a function is enhanced after IFN treatment.  相似文献   

13.
Adrenomedullin is a peptide that has been ascribed numerous functions. In the present paper, adrenomedullin has been localized immunhistochemically in a variety of skin glands of humans, elephants and impalas: apocrine scent glands, eccrine sweat glands, holocrine glands and mammary glands. In the apocrine glands expression of adrenomedullin varied with respect to staining intensity and intracellular localization. In general, glands which appeared to be actively secreting were more strongly stained than quiescent glands. However, within a single glandular tubule, individual cells differed considerably in the staining intensity of adrenomedullin. Adrenomedullin was present in both non-lactating and lactating mammary secretory epithelia, both ducts and alveoli reacted positively. In human mammary glands displaying apocrine metaplasia, the apical protrusions were strongly positive. Furthermore, positive immunostaining was found in endothelium and often in smooth muscle cells of small arteries and veins and in mast cells as well. Many of the adrenomedullin-positive epithelial cells were most strongly stained in the area of the Golgi apparatus, the cellular apex and particularly close to the basal side of the cell membrane. This pattern suggests packaging of adrenomedullin into secretory granules and secretion both at the apex of cells and at their basis. The first form of secretion suggests exocrine secretion, the latter form endocrine secretion of adrenomedullin. A possible hormonal function is in line with basally located electron dense small secretory granules, which have been found by electron microscopy in the glandular epithelia studied.  相似文献   

14.
15.
Mouse mammary epithelial cells (HC-11) and mammary tissues were analyzed for developmental changes in circadian clock, cellular proliferation, and differentiation marker genes. Expression of the clock genes Per1 and Bmal1 were elevated in differentiated HC-11 cells, whereas Per2 mRNA levels were higher in undifferentiated cells. This differentiation-dependent profile of clock gene expression was consistent with that observed in mouse mammary glands, as Per1 and Bmal1 mRNA levels were elevated in late pregnant and lactating mammary tissues, whereas Per2 expression was higher in proliferating virgin and early pregnant glands. In both HC-11 cells and mammary glands, elevated Per2 expression was positively correlated with c-Myc and Cyclin D1 mRNA levels, whereas Per1 and Bmal1 expression changed in conjunction with beta-casein mRNA levels. Interestingly, developmental stage had differential effects on rhythms of clock gene expression in the mammary gland. These data suggest that circadian clock genes may play a role in mouse mammary gland development and differentiation.  相似文献   

16.
By using the method of Bjerknes and Cheng, isolated murine gastrointestinal epithelial sheets were prepared for scanning electron microscopy. Examination of isolated epithelium from fundic stomach revealed numerous branched gastric glands. Parietal cells were easily detected bulging from the basal surface of the glandular epithelium. The basal surface membrane of parietal cells appeared smooth, with only sparse microvilluslike projections, whereas adjacent glandular cells had numerous 1- to 2-μm fingerlike projections which interdigitated laterally with similar processes from adjacent cells. Occasionally, paracrinelike cells having long cytoplasmic processes ranging from 10 to 20 μm in length were observed on the basal epithelial surface of the stomach and the colon, but not the small intestine. In isolated intestinal epithelia, the basal surface of crypt epithelial cells showed extensive cytoplasmic interdigitations, but no distinct morphology permitting recognition of individual cell types. Various stages of intestinal crypt bifurcation were seen. Craterlike spaces in the basal surface of crypt epithelium, presumably due to migrating leukocytes, were also numerous. Examination of the luminal surface of the isolated intestinal epithelium revealed that intimate associations between epithelium and mucosal-associated microorganisms were maintained, thus suggesting that minimal alterations in surface morphology were incurred by epithelial isolation. These observations on epithelial structure suggest that isolated gastrointestinal epithelia may be well suited for physiological studies of epithelial function and interactions with the microbial flora.  相似文献   

17.
Do the cardiac glands exist? 7. The cow   总被引:2,自引:0,他引:2  
The glands distributed in the narrow region of the abomasum contiguous to the omasum of the cow have been described as cardiac glands. We doubted this assertion and therefore performed histological and histochemical investigations of the glands to clarify their characteristics. 1. All glandular cells except the parietal cells in a few glands contiguous to the omasum react strongly to PAS, AB(pH 2.5), and PAS-AB(pH 2.5) staining, and moderately to AB(pH 0.5) staining. 2. Glandular cells at the base of these glands contain fine pepsinogen granules and a few parietal cells are distributed in these glands, indicating that they are undifferentiated gastric glands and that the so-called cardiac glands do not exist in the cow stomach. 3. Glandular cells in undifferentiated gastric glands are filled with PAS, AB(pH 2.5 and 0.5) and PAS-AB(pH 2.5) positive substances. Which gradually decrease and finally disappear with differentiation, remaining only in the neck (mucous neck cells) and the cells in the upper part of the glandular body (immature chief cells), in mature gastric glands. 4. Mature chief cells in differentiated gastric glands are distributed in the middle and lower bodies and base of the glands and contain a number of PAS and PAS-AB(pH 2.5) positive granules and a large number of coarse pepsinogen granules, while pepsinogen granules in the mucous neck cells and immature chief cells are finer. 5. In the cow the region in which undifferentiated gastric glands are located is very narrow. 6. Parietal cells in the cow stomach are numerous.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

18.
Gastric ulcers in humans are notoriously chronic and recurring lesions. Although the average individual who undergoes no treatments requires many years for healing, most studies on the healing process of the experimentally induced ulcers have mainly focused on the early stages. Natural history of the ulcer healing has not been completely revealed. We have undertaken long-term investigation up to the 150th day after the cryo-injury to shed light on the natural history of the ulcer healing process compared with developmental changes of postnatal fundic glands. By the 30th day, restitutive gastric glands were mostly seen to cover the ulcer lesions, where well-developed gland-type mucous cells, showing Griffonia simplicifolia agglutinin (GSA)-II labeling, appeared to occupy the basal portion. Most of the bromodeoxyuridine-labeled cells were superimposed on the GSA-II-positive cell zone, forming the proliferative zone. By the 150th day, the restitutive glands were complete, with all epithelial components and topology of the normal fundic glands. The process of the ulcer healing was quite compatible with the developmental changes of the postnatal fundic glands. These results imply that the regeneration of gastric epithelium during the ulcer healing follows pathways linked to the ontogenetic course of the fundic gland.  相似文献   

19.
Lens endopeptidase activity and thermal stability have been determined as a function of cell development, cell age, and animal age. Lenses from animals aged 3 months to 15 years (lens weights 1.15-2.80 g) were divided into epithelial (outermost), cortical (peripheral), and nuclear (central) regions. Changes accompanying cell development were determined by measuring specific activity in epithelial (undifferentiated), outer cortical (differentiating), inner cortical (mature) and nuclear (aged) regions of individual lenses. Thermal stability of the enzyme activity obtained from the outer cortical and nuclear regions of the same lenses was also determined. Specific activity and thermal stability were found to decrease as a function of lens cell development. Changes with cell development represent the effects of both differentiation and increasing cell age. To determine the effects of cell age alone, activity was determined in the same population of aged, fully differentiated cells in lenses of different ages. Specific activity decreased as a function of cell age alone. Changes with animal age were determined by comparing cells of the same developmental stage from animals of different ages (e.g., differentiating cells of the cortex in animals 3 months to 15 years old). Specific activity for the cortical region increased with animal age while specific activity in the nuclear region appeared to remain constant or decrease slightly with increasing animal age. Thermal stability of the enzyme activity from the cortex was different in young and adult lenses. The change in stability occurred early in the lifespan and was therefore more closely related to animal development than to aging.  相似文献   

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