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Cell and tissue research 24건

  1. [해외논문]   Development of antigenic heterogeneity in the splenic meshwork of severe combined immunodeficient (SCID) mice after reconstitution with T and B lymphocytes  

    Yoshida, Kikuyoshi ; Matsuura, Noboru ; Tamahashi, Nobuaki ; Takahashi, Tohru
    Cell and tissue research v.272 no.1 ,pp. 1 - 10 , 1993 , 0302-766x ,

    초록

    Abstract Recently, we produced monoclonal antibodies reacting specifically with the reticular meshwork (RM) of lymphoid tissues, and demonstrated that, in the splenic white pulp of normal mouse, the antigenic heterogeneity of RM was associated with the segregation of the T and B lymphocytes. In the present study, we attempted to visualize further the interaction between splenic RM and T and B lymphocytes transferred into severe combined immunodeficient (SCID) mice. The splenic white pulp of naive SCID mice, containing a few T and B cells, showed little tendency for T-B segregation and antigenic diversity of RM. Transfer of spleen or bone marrow cells from normal mice resulted in complete recovery of lymphocyte populations, showing not only a clear segregation of T and B lymphocytes but also a remarkable antigenic diversity of RM. The same results were obtained following the transfer of spleen or bone marrow cells from the nude mouse. Next, we transferred purified T lymphocytes to one group of SCID mice and B cells to another. In mice given T cells, a few B cells were observed in the white puop; T lymphocytes lodged not only in the inner periarterial lymphatic sheath (PALS) but also in the outer PALS and follicles. In the animals to which B cells were transferred, T cells were few and the homing of B cells occurred only into their proper compartments, such as the outer PALS, follicles and marginal zone, but not in the inner PALS. Thus, B cells can home into their proper compartments of the splenic white pulp independently of T lymphocytes.

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  2. [해외논문]   Gene expression and intracellular localization of somatolactin in the pituitary of rainbow trout  

    Kaneko, Toyoji ; Kakizawa, Sho ; Yada, Takashi ; Hirano, Tetsuya
    Cell and tissue research v.272 no.1 ,pp. 11 - 16 , 1993 , 0302-766x ,

    초록

    Abstract The gene expression and intracellular localization of somatolactin (SL), a putative pituitary hormone structurally related to both growth hormone and prolactin, were investigated in the pituitary of rainbow trout, Oncorhynchus mykiss . Using an in situ hybridization technique, we demonstrated the gene expression of the SL molecule in cells bordering the neurohypophysial tissue in the pars intermedia. These cells were identified immunocytochemically as SL-cells on the adjacent section. Electron-microscopic immunocytochemistry by means of the protein A-gold technique, also revealed that the SL-immunoreactivity was located mostly on the secretory granules in SL-cells. Our findings clearly indicate that SL is biosynthesized and stored in the granules in these cells.

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  3. [해외논문]   Morphological specializations of dorsal rim ommatidia in the compound eye of dragonflies and damselfies (Odonata)  

    Meyer, Eric P. ; Labhart, Thomas
    Cell and tissue research v.272 no.1 ,pp. 17 - 22 , 1993 , 0302-766x ,

    초록

    Abstract We have examined the fine structure of dorsal rim ommatidia in the compound eye of the three odonate species Sympetrum striolatum, Aeshna cyanea and Ischnura elegans . These ommatidia exhibit several specializations: (1) the rhabdoms are very short, (2) there is no rhabdomeric twist, and (3) the rhabdoms contain only two, orthogonally-arranged microvillar orientations. The dorsal rim ommatidia of several other insect species are known to be anatomically specialized in a similar way and to be responsible for polarization vision. We suggest that the dorsal rim area of the odonate compound eye plays a similar role in polarization vision. Since the Odonata are a primitive group of insects, the use of polarized skylight for navigation may have developed early in insect phylogeny.

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  4. [해외논문]   Polarized distribution of &ggr; interferon-stimulated MHC antigens and transferrin receptors in a clonal cell line isolated from Fisher rat thyroid (FRT cells)  

    Boudier, Jeanne-Andrée ; Fantini, Jacques ; Gerard, Corinne ; Verrier, Bernard
    Cell and tissue research v.272 no.1 ,pp. 23 - 31 , 1993 , 0302-766x ,

    초록

    Abstract The characteristics of a polarized epithelial cell line and dynamics of an endogeneous polarized plasma membrane constituent were studied by use of an subclone, FRT-9, from the Fisher rat thyroid cell line, FRT. Transmission electron microscopy (conventional, freeze-fracture), determination of transepithelial electrical parameters and immuno-fluorescence study, were used to establish polarity and demonstrated the basolateral distribution of transferrin receptors and the major histocompatibility complex antigens (constitutive Class I or &ggr; interferon-induced Class II).

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  5. [해외논문]   Ultrastructural analysis of the developing follicle during early vitellogenesis in tilapia, Oreochromis niloticus, with special reference to the steroid-producing cells  

    Nakamura, Masaru ; Specker, Jennifer L. ; Nagahama, Yoshitaka
    Cell and tissue research v.272 no.1 ,pp. 33 - 39 , 1993 , 0302-766x ,

    초록

    Abstract The development and distribution of steroid producing cells (SPCs) in the ovary of tilapia have been studied by light and electron microscopy. At 40–50 d after hatching, these cells are seen only in the vicinity of blood vessels; there are no SPCs in the interstitial region, nor in the thecal layer enclosing young oocytes at the peri-nucleolus stage. By 70–80 d after hatching, the number of SPCs in the area near blood vessels has increased, and the capillaries have spread among the developing peri-nucleolar stage oocytes, and into the ovarian tunica. Clusters of SPCs have also migrated into the interstitial region and into the tunica along with these capillaries. In the ovary 100 d after hatching, some SPCs can be found in the thecal layer enclosing vitellogenic oocytes. Moreover, masses of SPCs can now be observed infiltrating the thecal layer of the oocyte. Serum testosterone (T) and estradiol-17&bgr; (E2) levels at 40–70 d after hatching, are low (T, 0.75–1.10 ng/ml, E2, 0.36–1.08 ng/ml), but at 100 d, plasma E2, but not T, is elevated (T, 1.95 ng/ml, E2, 4.65 ng/ml). These results suggest that SPCs appearing in the vicinity of blood vessels move into the interstitial region between oocytes, and finally enclose the oocytes at an early vitellogenic stage. It is interesting to note that the enclosure of oocytes by SPCs coincides with significant increases in E2 production.

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  6. [해외논문]   Morphofunctional study on prolactin-producing cells of the anterior pituitaries in adult male rats following thyroidectomy, thyroxine treatment and/or thyrotropin-releasin hormone treatment  

    Ozawa, Hitoshi ; Kurosumi, Kazumasa
    Cell and tissue research v.272 no.1 ,pp. 41 - 47 , 1993 , 0302-766x ,

    초록

    Abstract An immunoelectron-microscopic and morphometric study was carried out on the anterior pituitary prolactin (PRL) cells of adult male Wistar rats treated with a combination of thyroidectomy and administration of L-thyroxine (T 4 ) and/or synthetic thyrotropin-releasing hormone (TRH) in order to clarify the effects of changes in the hypothalamus-pituitary-thyroid axis on the ultrastructure and function of PRL cells. After thyroidectomy, PRL cells underwent atrophy and hypofunction of their cell organelles, but these changes tended to be restored to their normal level by T 4 treatment. On the other hand, the administration of TRH to intact rats produced hypertrophy and hyperfunction in the PRL cells, although this treatment had no effect on the PRL cells of thyroidectomized rats. However, treatment with a combination of T 4 and TRH had a strong effect and led to hypertrophy and hyperfunction in the PRL cells of thyroidectomized rats. Serum and pituitary PRL levels were measured by radioimmunoassay (RIA) for a comparison with the morphological results. They correlated well with the morphological changes. These results indicate that TRH stimulates PRL secretion in the presence of thyroid hormone, and that the thyroid hormone plays an important role in the basic maintenance of PRL cell function and its reactivity to TRH.

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  7. [해외논문]   Occurrence, distribution and neurochemical features of small intestinal neurons projecting to the cranial mesenteric ganglion in the pig  

    Timmermans, J. -P. ; Barbiers, M. ; Scheuermann, D. W. ; Stach, W. ; Adriaensen, D. ; De Groodt-Lasseel, M. H. A.
    Cell and tissue research v.272 no.1 ,pp. 49 - 58 , 1993 , 0302-766x ,

    초록

    Abstract The small intestine of the pig has been investigated for its topographical distribution of enteric neurons projecting to the cranial mesenteric ganglion, by using Fast Blue or Fluorogold as a retrogradely transported neuronal tracer. Contrary to the situation in small laboratory animals such as rat and guinea-pig, the intestinofugally projecting neurons in the porcine small intestine were not restricted to the myenteric plexus, but were observed in greater numbers in ganglia of the outer submucous plexus. The inner submucous plexus was devoid of labelled neurons. Retrogradely labelled neurons were mostly found, either singly or in small aggregates, in ganglia located within a narrow border on either side of the mesenteric attachment. For both nerve networks, their number increased from duodenum to ileum. All the retrogradely labelled neurons exhibited a multidendritic uniaxonal appearance. Some of them displayed type-III morphology and stained for serotonin. This study indicates that, in the pig, not only the myenteric plexus but also one submucous nerve network is involved in the afferent component of intestino-sympathico-intestinal reflex pathways. The finding that some of the morphologically defined type-III neurons participate in these reflexes is in accord with the earlier proposal that type-III neurons are supposed to fulfill an interneuronal role, whether intra- or extramurally.

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  8. [해외논문]   Ultrastructure of the taste disc in the red-bellied toad Bombina orientalis (Discoglossidae, Salientia)  

    Witt, Martin
    Cell and tissue research v.272 no.1 ,pp. 59 - 70 , 1993 , 0302-766x ,

    초록

    Abstract The taste disc of the red-bellied toad Bombina orientalis (Discoglossidae) has been investigated by light and electron microscopy and compared with that of Rana pipiens (Ranidae). Unlike the frog, B. orientalis possesses a disc-shaped tongue that cannot be ejected for capture of prey. The taste discs are located on the top of fungiform papillae. They are smaller than those in Ranidae, and are not surrounded by a ring of ciliated cells. Ultrastructurally, five types of cells can be identified (mucus cells, wing cells, sensory cells, and both Merkel cell-like basal cells and undifferentiated basal cells). Mucus cells are the main secretory cells of the taste disc and occupy most of the surface area. Their basal processes do not synapse on nerve fibers. Wing cells have sheet-like apical processes and envelop the mucus cells. They contain lysosomes and multivesicular bodies. Two types of sensory cells reach the surface of the taste disc; apically, they are distinguished by either a brush-like arrangement of microvilli or a rod-like protrusion. They are invaginated into lateral folds of mucus cells and wing cells. In contrast to the situation in R. pipiens , sensory cells of B. orientalis do not contain dark secretory granules in the perinuclear region. Synaptic connections occur between sensory cells (presynaptic sites) and nerve fibers. Merkel cell-like basal cells do not synapse onto sensory cells, but synapse-like connections exist between Merkel cell-like basal cells (presynaptic site) and nerve fibers.

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  9. [해외논문]   Effect of omeprazole-evoked hypergastrinemia on ultrastructure of enterochromaffin-like cells in the stomach of portacaval-shunted rats  

    Chen, D. ; Håkanson, R. ; Sundler, F.
    Cell and tissue research v.272 no.1 ,pp. 71 - 77 , 1993 , 0302-766x ,

    초록

    Abstract The histamine-producing enterochromaffinlike (ECL) cells in the acid-producing portion of the rat stomach responded to long-standing hypergastrinemia (omeprazole treatment daily for 8–10 weeks) with hypertrophy (and hyperplasia) and with a reduced number of granules and vesicles per unit cytoplasm. There was a reduction in the ratio of electron-dense granules versus vesicles and an increase in the profile diameter of the vesicles. Also, portacaval shunting (PCS) induced changes in the ECL cells, manifesting (i) as an increase in cell number and size, and (ii) as a reduced number of granules and vesicles per unit area. The cytoplasmic granules and vesicle profiles were enlarged, and the ratio of granules versus vesicles was reduced. The combination of PCS and long-standing hypergastrinemia (omeprazole treatment) produced a greatly enhanced ECL cell hypertrophy (and hyperplasia) and a marked reduction in the number of granules. The ratio of granules versus vesicles was markedly reduced while the profile diameters of both granules and vesicles were increased. The relative predominance of very large vesicles (vacuoles) was a prominent feature of the ECL cells in these rats.

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  10. [해외논문]   Topography of short portal vessels in the rat pituitary gland: a scanning electron-microscopic and morphometric study of corrosion cast replicas  

    Gross, Paul M. ; Joneja, Madan G. ; Pang, Judy J. ; Polischuk, Trevor M. ; Shaver, Steven W. ; Wainman, Dan S.
    Cell and tissue research v.272 no.1 ,pp. 79 - 88 , 1993 , 0302-766x ,

    초록

    Abstract We applied scanning electron microscopy combined with imaging and morphometric techniques to analyze the dorsal topography and morphology of short portal vessels linking the capillary beds of the pituitary neural and anterior lobes in adult male albino rats. The pituitary microvasculature was replicated by intracarotid injection of Batson's No. 17 compound producing plastic casts that were advantageous for comprehensive morphometric analyses using an imaging device. The analysis revealed the existence of two types of portal vessels having quantitatively different morphological properties. The bilateral venular plexus of 3–4 vessels located at the base of the infundibular stalk (each venule measuring 300 μm in length and 32 μm in diameter) appears to be the major part of the short portal system in the dorsum of the rat pituitary gland. Narrower capillary-like shunt vessels (6.8 μm in diameter), of about the same length as the venules, were situated throughout other subregions of the intermediate lobe cleft. The short portal vessels of both types made direct anastomoses with the capillary networks in the neural and anterior lobes. The neural lobe capillaries were twice as numerous (1324 per mm 2 ), and only half as wide (6.2 μm), as the sinusoidal capillaries in the anterior lobe (density of 637 per mm 2 ; diameter of 13.7 μm). The topographical position of the portal venular system suggests that the caudolateral subregions of the pituitary neural and anterior lobes have a functional relationship dependent on rapid interlobe transfer of neurohumoral factors such as hormones via the portal blood. This process appears to be supplemented throughout the rest of the cleft between the two lobes by a small number of capillary shunts that supply the epithelial cell lobules of the intermediate lobe in situ. The findings collectively indicate that this portal system provides a constant stream of neurohumoral information that is shared moment-by-moment between the pituitary neural and anterior lobes.

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