Abstract：
:In an ultrastructural study on the spermiogenesis of the rainbow trout (Salmo gairdneri R.) four spermatogenetic stages were identified. In young round spermatids, the nuclear chromatin was first heterogeneous (euchromatin and heterochromatin). Subsequently, it became more homogeneous and started to condense in the form of coarse granules and fibers and then into fibrils associated in ribbon-like elements which eventually partly fused together. During early spermiogenesis, a juxtanuclear vacuole appeared in the area where the nuclear envelope was specialized due to condensation of material between the two envelopes and a slight accumulation of nuclear material. This area was finally located in the anterior part of spermatids and spermatozoa; it probably plays a role during fertilization. A flagellar rootlet appeared early in spermiogenesis; it may play a role in the attachment of the flagellum to the nucleus since it persisted until the centriolar complex was definitively fixed in the implantation fossa. The flagellum did not display a plasma membrane and was first located in the cytoplasm, but when it was later extruded from the cell, it acquired a membrane. The cytoplasm was rich in ribosomes (free or in small groups) but poor in membranous organelles. The few mitochondria polarized around the centriolar complex were finally organized into an annular mid-piece. The spermatids remained connected by intercellular bridges until the end of spermiogenesis. The complexity of trout spermiogenesis is intermediate between that in poecilids and that in carp and pike, which have very simple spermatozoa. The role of the material from the nucleus and the cytoplasm reaching the Sertoli cell in the control of spermatogenesis has been discussed.
journal_name
Cell Tissue Resjournal_title
Cell and tissue researchauthors
Billard Rdoi
10.1007/BF00238295subject
Has Abstractpub_date
1983-01-01 00:00:00pages
265-84issue
2eissn
0302-766Xissn
1432-0878journal_volume
233pub_type
杂志文章abstract：:The presence of immunoreactive enkephalin, dynorphin, vasoactive intestinal polypeptide, cholecystokinin, substance P and neuropeptide Y in nerve fibers that project to the guinea-pig inferior mesenteric ganglion was analysed, after different denervation and ligation procedures. A quantitative analysis demonstrates th...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00219741
更新日期：1988-09-01 00:00:00
abstract：:Central projections of the nervus terminalis (n.t.) in the goldfish were investigated using cobalt- and horseradish peroxidase-tracing techniques. Single n.t. fibers were identified after unilateral application of cobalt chloride-lysine to the rostral olfactory bulb. The central course and branching patterns of indivi...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00218095
更新日期：1986-01-01 00:00:00
abstract：:The intrapancreatic localization and the effects on basal and stimulated insulin secretion of neuropeptide Y (NPY) were investigated in the mouse. Immunocytochemistry showed NPY to be confined to intrapancreatic nerve fibers mainly associated with blood vessels. Fine varicose NPY fibers were also detected in the exocr...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF01239960
更新日期：1987-04-01 00:00:00
abstract：:We report here on cholinergic neurons in the rat hippocampal formation that were identified by immunocytochemistry employing a monoclonal antibody against choline acetyltransferase (ChAT), the acetylcholine-synthesizing enzyme. In general, ChAT-immunoreactive cells were rare, but were observed in all layers of the hip...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00215891
更新日期：1986-01-01 00:00:00
abstract：:Kainate receptors form a family of ionotropic glutamate receptors that appear to play a special role in the regulation of the activity of synaptic networks. This review first describes briefly the molecular and pharmacological properties of native and recombinant kainate receptors. It then attempts to outline the gene...
journal_title：Cell and tissue research
pub_type： 杂志文章,评审
doi：10.1007/s00441-006-0265-6
更新日期：2006-11-01 00:00:00
abstract：:Bullous pemphigoid antigen-1 (BPA1) and alpha(6)beta(4)-integrin colocalize at the hemidesmosomes in basal-layer keratinocytes of normal squamous epithelia. The expression of these genes was analyzed during the process of tumor cell invasion and metastasis on frozen sections of head and neck biopsies, and the structur...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s004410100462
更新日期：2001-12-01 00:00:00
abstract：:Modifications of hepatocyte cell surface were determined after single i.v. injection to rats of Pb(NO(3))(2) (known to induce liver hyperplasia followed by apoptosis) or GdCl(3) (known to induce proliferation of parenchymal cells and Kupffer cell depletion) or administration of GdCl(3) 24 h before Pb(NO(3))(2) injecti...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s00441-003-0708-2
更新日期：2003-04-01 00:00:00
abstract：:Ependymal cells located above the ventricular zone of the lateral, third, and fourth ventricles and the spinal cord are thought to form part of the adult neurogenic niche. Many studies have focused on ependymal cells as potential adult neural stem/progenitor cells. To investigate the functions of ependymal cells, a si...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s00441-019-03132-5
更新日期：2020-03-01 00:00:00
abstract：:The epithelial surface of the taste disc on the fungiform papillae of the frog was studied by means of freeze-fracture and conventional electron microscopy. The plasma membrane of the apical process of taste receptor cells was found to exhibit a uniform population of 10-nm intramembrane particles on its fracture face ...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00216883
更新日期：1982-01-01 00:00:00
abstract：:The ultrastructure of the contractile apparatus of the rat soleus muscle during the course of denervation atrophy was investigated. It was found that the ratio of thin the thick filaments increased in myofibrils of atrophying muscle fibers. Elevation of the ratio was observed as early as the second day after denervati...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00216767
更新日期：1981-01-01 00:00:00
abstract：:Rainbow trout (Oncorhynchus mykiss) were exposed to ion-poor (soft) water to test the hypothesis that naturally induced proliferation of branchial chloride cells causes a thickening of the blood-to-water diffusion barrier. This was achieved by using a combination of scanning and transmission electron-microscopic techn...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s004410050622
更新日期：1996-07-01 00:00:00
abstract：:While brain-derived neurotrophic factor (BDNF) messenger RNA (mRNA) has been localized in the developing gustatory epithelium, little information is available about neurotrophin-3 (NT-3) mRNA expression pattern in the prenatal developing gustatory and lingual epithelium. In the present study, using in situ hybridizati...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s004410051092
更新日期：1998-06-01 00:00:00
abstract：:The ultrastructure of the mid-gut cells of female Nasonia vitripennis is described. The mid-gut consists of a uniform, single-cell epithelium. The cells of different gut regions were analysed using morphometric techniques in order to determine any differences in the components. The structure of the cells is described ...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00221084
更新日期：1977-02-09 00:00:00
abstract：:The effects of cytochalasin B (CB) on pancreatic structure and amylase release were studied by use of pancreatic fragments, isolated acini and isolated acinar cells. In pancreatic fragments and isolated acini CB caused the disappearance of microfilaments underlying the apical plasma membrane, loss of apical microvilli...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00219848
更新日期：1977-04-29 00:00:00
abstract：:Periodontal ligament (PDL) stem cell properties are critical in the periodontal tissue regeneration for periodontitis. Previously, we have demonstrated that cigarette smoking attenuates PDL-derived stem cell (PDLSC) regenerative properties. Here, we report the findings on the regenerative properties of human PDLSCs wi...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s00441-020-03176-y
更新日期：2020-07-01 00:00:00
abstract：:New genome-editing approaches, such as the CRISPR/Cas system, have opened up great opportunities to insert or delete genes at targeted loci and have revolutionized genetics in model organisms like the zebrafish. The Cre-loxp recombination system is widely used to activate or inactivate genes with high spatial and temp...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s00441-018-2798-x
更新日期：2018-04-01 00:00:00
abstract：:The vertebrate limb is a powerful model system for studying the cellular and molecular interactions that determine morphological pattern during embryonic development. Recent advances in our understanding of these interactions have shed new light on the molecular mechanisms of vertebrate limb development, evolution and...
journal_title：Cell and tissue research
pub_type： 杂志文章,评审
doi：10.1007/s004410051261
更新日期：1999-04-01 00:00:00
abstract：:Changes in the organisation and composition of extracellular matrix in human endometrium during the menstrual cycle and early pregnancy have been assessed by immunofluorescence. Amongst interstitial components, type-III and type V-collagens and fibronectin are present in endometrial stroma throughout the menstrual cyc...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00221758
更新日期：1988-07-01 00:00:00
abstract：:It is clear that the well-described phenomenon of epithelial-mesenchymal transition (EMT) plays a pivotal role in embryonic development, wound healing, tissue regeneration, organ fibrosis and cancer progression. EMTs have been classified into three subtypes based on the functional consequences and biomarker context in...
journal_title：Cell and tissue research
pub_type： 杂志文章,评审
doi：10.1007/s00441-011-1227-1
更新日期：2012-01-01 00:00:00
abstract：:Thyroid hormone (TH) plays an important role in regulating ovarian development. However, the mechanism involved remains unclear. Evidence suggests that glucose is essential for ovarian development, and its uptake is mediated by several glucose transporter proteins (Glut). We have investigated the effects of TH on Glut...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s00441-016-2453-3
更新日期：2016-11-01 00:00:00
abstract：:An ectodermal network of nerve cells has been observed in the echinopluteus. It seems to connect the ectodermal cell bodies with each other and with deeper parts of the nerve system. Together with the neurohumour containing parts of the ventral and oral ciliated bands, the nerve cells probably provide the larva with t...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00219793
更新日期：1977-04-07 00:00:00
abstract：:Using specimens of human submandibular glands, we have investigated in vitro the morphological modifications induced by clozapine, a dibenzodiazepine derivative that is used in psychotic patients and that provokes hypersalivation, a side-effect of therapy. The effects of the drug, used alone or in combination with car...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s00441-005-0149-1
更新日期：2006-05-01 00:00:00
abstract：:The size, density and total number of neuroepithelial bodies (NEB) in the lungs of late fetal, neonatal, and mature rabbits were determined using fluorescence microscopy. In this study lungs from 27-, 29-, 30-, and 31-day fetuses; neonates of ages 2, 7, and 30 days; and 4- and 7(+)-month-old rabbits, were used. The to...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00219875
更新日期：1984-01-01 00:00:00
abstract：:The nine-banded armadillo possesses a salivary bladder which is a dilated portion of the main duct of the submandibular gland at its origin. The wall of the bladder is composed of an epithelium, a submucosa and a thick coat of skeletal muscle. The ultrastructure of the epithelium reveals that it is complex and consist...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00219609
更新日期：1976-06-28 00:00:00
abstract：:The extracellular matrix is involved in various morphogenetic processes which are accompanied by changes in its physicochemical properties and spatial organization. In the adult brain it contributes to cellular communication and the regulation of neuronal activity. The present study deals with the postnatal appearance...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s004410050790
更新日期：1997-04-01 00:00:00
abstract：:In vitro incubation of autonomic nerves with vinblastine sulphate (1 times 10(-4) M) caused a disappearance of microtubules within 15 min; during the following 15 min paracrystalline arrays appeared within the axons. An increase in the abundance of microfilaments was also observed, but these did not appear to arise fr...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00220136
更新日期：1976-02-25 00:00:00
abstract：:To gain a better understanding of the neuroplasticity of sympathetic neurons during postnatal ontogenesis, the distribution of neuronal nitric oxide synthase (nNOS) immunoreactivity was studied in sympathetic preganglionic neurons (SPN) in the spinal cord (Th2 segment) of female Wistar rats at different ages (newborn,...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s00441-018-2925-8
更新日期：2019-02-01 00:00:00
abstract：:The retinal projections in adult and juvenile guitar fish (Rhinobatos productus) were determined with the aid of the Nauta-Fink-Heimer techniques. The visual system was found to be more extensive and more differentiated than in any other elasmobranch studied to date. Massive projections exist to the dorsal and ventral...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00232768
更新日期：1980-01-01 00:00:00
abstract：:In the central nervous system of the male domestic flow, metenkephalin (ENK) immunoreactive perikarya and fiber tracts as well as extensive but sharply delimited fiber networks were visualized by means of the PAP technique. The most striking results were: (1) The demonstration of an association of ENK-containing struc...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/BF00236920
更新日期：1980-01-01 00:00:00
abstract：:CYCLE (CYC) and CLOCK (CLK) are transcriptional activators of the circadian clock genes, period (per) and timeless (tim), binding at E-boxes of their upstream regulatory region in Drosophila. CYC-like and CLK-like immunohistochemical reactivities (CYC-ir and CLK-ir) were investigated in the ground cricket, Allonemobiu...
journal_title：Cell and tissue research
pub_type： 杂志文章
doi：10.1007/s00441-007-0534-z
更新日期：2008-02-01 00:00:00
