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排序方式: 共有1680条查询结果,搜索用时 15 毫秒
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Takuro Yoshikawa Yasuyuki Suzuki Yasuhiro Fujino Keitaro Kakinoki Shiri Li Tadahiro Goto Tomohiro Tanaka Ippei Matsumoto Tetsuya Sakai Yasuki Tanioka Hiroshi Yokozaki Yoshikazu Kuroda 《American journal of transplantation》2005,5(9):2135-2142
Small bowel transplantation (SBT) is associated with a high incidence of infectious complications because of ischemia/reperfusion (I/R) mucosal injury concomitant with potent immunosuppression. In this study, we evaluated whether the cavitary two-layer method (cTLM) could reduce I/R injury and allow early mucosal restoration, particularly after prolonged preservation and transplantation. Canine heterotopic segmental SBT was performed immediately without preservation (group 1), after 24-h preservation in UW solution (group 2) or by the cTLM (group 3). The graft samples were taken 1 h after reperfusion and on days 1, 4 and 7. We assessed graft mucosa with detailed microscopic and electromicroscopic analyses. In Group 3, histological injury and cell apoptosis after transplantation were significantly alleviated and rapidly recovered to a similar level of group 1. The mucosal restoration was morphologically completed within 4 days. In contrast, in group 2, more pronounced mucosal injury and delayed recovery were noted. Crypt cell proliferation activity was well maintained in groups 1 and 3 throughout the experimental period. Our ultrastructural analysis suggested that mitochondrial integrity achieved by the cTLM was a basal mechanism under the prompt mucosal restoration. The cTLM could reduce I/R injury, facilitate mucosal regeneration and restore the nearly normal structure early after SBT. 相似文献
4.
Takuro Katoh 《Nippon Ishinkin Gakkai Zasshi》2006,47(2):63-67
Environments may act as reservoirs for pathogenic fungi, a determinant of the establishment of fungal infection, or an exacerbating factor of disease. In recent years, skin disease caused by geophilic fungi has been decreasing, while case reports of zoonoses from various animals are increasing. Outbreaks of anthropophilic T. tonsurans infection pose a problem to medical mycologists. Tinea pedis is the most common exogenous dermatomycosis in Japan. Although T. rubrum is presumed to be the dominant pathogen of this disease, T. mentagrophytes is detected more frequently from various environments, so far, the reason for this discrepancy has not been fully understood. The latest knowledge about the route of dermatophyte foot infection is as follows: (1) Dermatophyte propagules disseminated from patients may contaminate not only bath-mats but also wood floors, Japanese style mattings, concrete floors, slippers, cushions, etc., and from them adhere to healthy skin. (2) The agar stamping method can easily detect dermatophytes from the skin and the environment. (3) Propagules of T. mentagrophytes can survive for more than three months under certain conditions such as in rubber boots. (4) In order to eliminate dermatophytes gathered in socks and footwear, simple procedures (washing, bathing with hot water, or wiping with a towel) are all effective. (5) Prior application of an antifungal agent promptly eradicates dermatophyte propagules adhering to the skin from the environment. The author also mentioned the possibility of asymptomatic dermatophyte colonization, and the high prevalence of dysgeucia in oral carriers of Candida albicans. 相似文献
5.
Ogata T 《Medical molecular morphology》2005,38(4):243-250
Brush cells are widely distributed in the digestive and respiratory apparatus, but their function is still unknown. Because
brush cells (BC) are found in organs secreting NaHCO3, it was hypothesized that these cells may secrete NaHCO3. To test this possibility, rat common bile duct epithelia were examined by ultrastructural cytochemical methods for localizing
HCO3−, Cl−, and Na+ ions. All three ion precipitates were few in or on BCs of rats without stimulation. Lead carbonate precipitates, which localized
HCO3− ions by the lead nitrate-osmium method, increased markedly on the surface of the microvilli (MV) of BCs after secretin or
meal stimulation, but similar precipitates were few on the luminal surface of principal cells (PCs). Silver chloride precipitates,
which indicate the presence of Cl− ions by the silver-osmium method, increased in the apical cytoplasm and in MV of BCs after secretin or meal stimulation,
but they were few in PCs. Sodium pyroantimonate precipitates, which localize Na+ ions by the potassium pyroantimonate-osmium method, increased on the surface of the MV, along the basolateral membrane, and
in the apical cytoplasm of BCs after secretin or meal stimulation, but they were few in PCs. These results strongly suggest
that BCs may be a significant source of NaHCO3 secretion. 相似文献
6.
Doi A Okano M Akagi H Nishizaki K Taguchi T Murakami T Ohtsuka A 《Anatomical science international / Japanese Association of Anatomists》2003,78(1):62-67
The musk shrew, Suncus murinus, is one of the primitive mammals and has a pair of palatine tonsils. In the present study,
we investigated the blood microvascular architecture of the tonsil in this animal by scanning electron microscopy of corrosion
casts. The paranodular arterioles entered the lymph nodule to form a coarse capillary plexus within the nodule. Some of the
arterioles reached the dome region to give rise to a fine meshwork of dome subepithelial capillaries. This dome subepithelial
capillary network did not show any hairpin or switch-back patterns, as seen in human and rabbit tonsils. Both of the nodular
and dome capillaries were drained into the postcapillary venules in the periphery of the nodular or the paranodular region.
On the surface of these cast venules, oval-shaped indentations were seen corresponding to the luminal surface of the high
endothelial venules. These venules were collected into the large vein at the bottom of the tonsil. The blood vascular architecture
of the musk shrew tonsil is basically the same as those of other mucosa-associated lymphoid tissues in mammals. 相似文献
7.
Horie R Watanabe T Ito K Morisita Y Watanabe M Ishida T Higashihara M Kadin M Watanabe T 《The American journal of pathology》2002,160(5):1647-1654
We previously reported that ligand-independent signaling by highly expressed CD30 in Hodgkin-Reed-Sternberg (H-RS) cells is responsible for constitutive activation of NF-kappa B. In the present study, we characterize the intracellular localization of tumor necrosis factor (TNF) receptor associated factor (TRAF) proteins in H-RS cells. Confocal immunofluorescence microscopy of cell lines derived from H-RS cells and HEK293 transformants highly expressing CD30 revealed aggregation of TRAF2 and TRAF5 in the cytoplasm as well as clustering near the cell membrane. In contrast, TRAF proteins were diffusely distributed in the cytoplasm in cell lines unrelated to Hodgkin's disease (HD) and control HEK293 cells. Furthermore, the same intracellular distribution of TRAF proteins was demonstrated in H-RS cells of lymph nodes of HD, but not in lymphoma cells in lymph nodes of non-Hodgkin's lymphoma. Dominant-negative TRAF2 and TRAF5 suppressed cytoplasmic aggregation along with constitutive NF-kappa B activation in H-RS cell lines. Confocal immunofluorescence microscopy also revealed co-localization of IKK alpha, NIK, and I kappa B alpha with aggregated TRAF proteins in H-RS cell lines. These results suggest involvement of TRAF protein aggregation in the signaling process of highly expressed CD30 and suggest they function as scaffolding proteins. Thus, cytoplasmic aggregation of TRAF proteins appears to reflect constitutive CD30 signaling which is characteristic of H-RS cells. 相似文献
8.
A new method for histamine release from purified peripheral blood basophils using monoclonal antibody-coated magnetic beads 总被引:13,自引:0,他引:13
Nishi H Nishimura S Higashiura M Ikeya N Ohta H Tsuji T Nishimura M Ohnishi S Higashi H 《Journal of immunological methods》2000,240(1-2):39-46
A new method for evaluating histamine release from purified basophils was developed. Basophil-containing leukocytes were directly purified from a small amount of peripheral blood using monoclonal antibody BA312-coated magnetic beads. The purified basophils still rosetted to magnetic beads maintained a normal response to anti-IgE and to dust mite allergen in comparison with the conventional method using washed leukocytes. This methodology facilitates the purification of basophils, anti-IgE- and allergen-induced histamine release, and subsequent histamine determination within only 3 h. The released histamine was analyzed by an enzyme-linked immunosorbent assay (ELISA) with a characteristic detection profile. Since all steps were performed in 96-well microplates, many clinical samples could be analyzed at the same time, permitting easy applications in routine laboratories. 相似文献
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Kai Aoki Takuji Suzuki Fang Hui Takuro Nakano Koki Yanazawa Masato Yonamine Shinichiro Fujita Takehito Sugasawa Yasuko Yoshida Naomi Omi Yasushi Kawakami Kazuhiro Takekoshi 《Nutrients》2021,13(5)
The effects of exercise on nutrient digestion and absorption in the intestinal tract are not well understood. A few studies have reported that exercise training increases the expression of molecules involved in carbohydrate digestion and absorption. Exercise was also shown to increase the blood concentration of glucagon-like peptide-2 (GLP-2), which regulates carbohydrate digestion and absorption in the small intestine. Therefore, we investigated the effects of exercise on the expression of molecules involved in intestinal digestion and absorption, including GLP-2. Six-week-old male mice were divided into a sedentary (SED) and low-intensity exercise (LEx) group. LEx mice were required to run on a treadmill (12.5 m/min, 1 h), whereas SED mice rested. All mice were euthanized 1 h after exercise or rest, and plasma, jejunum, ileum, and colon samples were collected, followed by analysis via IHC, EIA, and immunoblotting. The levels of plasma GLP-2 and the jejunum expression of the GLP-2 receptor, sucrase-isomaltase (SI), and glucose transporter 2 (GLUT2) were higher in LEx mice. Thus, we showed that acute low-intensity exercise affects the expression of molecules involved in intestinal carbohydrate digestion and absorption via GLP-2. Our results suggest that exercise might be beneficial for small intestine function in individuals with intestinal frailty. 相似文献