Demonstration of microtubules in the terminal web of mature absorptive cells from the small intestine of the rat

1987 ◽  
Vol 248 (3) ◽  
pp. 709-711 ◽  
Author(s):  
SusanJ. Hagen ◽  
CarolH. Allan ◽  
JerryS. Trier
Keyword(s):  
Small Intestine ◽  
Terminal Web ◽  
Absorptive Cells

scholarly journals Adenocarcinomas of the Intestine Induced in Syrian Hamsters by N-methyl-N-nitrosourea

1969 ◽  
Vol 6 (5) ◽  
pp. 403-412
Author(s):  
Katherine McD. Herrold
Keyword(s):  
Small Intestine ◽  
Cytological Change ◽  
Histological Changes ◽  
Syrian Hamsters ◽  
Histological Types ◽  
Absorptive Cells ◽  
Cytological Features

The adenocarcinomas of the intestine induced in Syrian hamsters by N-methyl-N-nitrosourea (NMU) were of two histological types, superficial and intestinal. These types had distinctive characteristics regarding pattern, cytological features, secretion of mucus, and mode of growth. The histological changes induced by NMU in the mucosa of the small intestine differed from what has been described in enzootic intestinal adenocarcinoma and proliferative ileitis of Syrian hamsters. NMU produced alteration in the villous architecture and cytological change in the absorptive cells. There was marked shortening of the villi and reduced thickness of the mucosa. The villous absorptive cells were large and cuboidal with centrally placed nuclei.

Endocytosis by absorptive cells in the middle segment of the suckling rat small intestine

2002 ◽  
Vol 77 (2) ◽  
pp. 117-123 ◽  
Author(s):  
Ryoko Baba ◽  
Mamoru Fujita ◽  
Chen En Tein ◽  
Masayuki Miyoshi
Keyword(s):  
Small Intestine ◽  
Rat Small Intestine ◽  
Middle Segment ◽  
Absorptive Cells

Small Intestine: Absorptive Cells

2010 ◽  
pp. 224-225
Author(s):  
Margit Pavelka ◽  
Jürgen Roth
Keyword(s):  
Small Intestine ◽  
Absorptive Cells

scholarly journals The terminal web. A reevaluation of its structure and function.

1979 ◽  
Vol 81 (1) ◽  
pp. 67-82 ◽  
Author(s):  
B E Hull ◽  
L A Staehelin
Keyword(s):  
Small Intestine ◽  
Plasma Membranes ◽  
Intercellular Junctions ◽  
Integrated System ◽  
Junctional Complex ◽  
High Voltage Electron Microscopy ◽  
Mechanical Coupling ◽  
Voltage Electron ◽  
Apical Cytoplasm ◽  
Terminal Web

The apical cytoplasm of epithelial cells of the small and large intestines has been examined by freeze-etch techniques as well as conventional and high voltage electron microscopy of sectioned material to gain a better understanding of the fine structural organization of the terminal web region. In the small intestine the terminal web exhibits a distinct stratification caused by the association of different sets of filaments with the three members of the junctional complex. Individual filaments of this network are closely associated with the sealing elements of the tight junctions, the surface of the core microfilament bundles, and the intermicrovillar plasma membrane. This region of the terminal web is the apical zone. The adherens zone appears as a band of interwoven filaments of two different diameters extending across the cytoplasm at the level of the intermediate junction. Within this region of the terminal web, individual 60-70 A actin-like filaments separate from the bundles of core microfilaments to interact with one another and with filaments of similar diameter from the zonula adherens. 100 A tonofilaments also contribute to the adherens zone, presumably stabilizing the orientation of the actin-like filaments. The basal zone which underlies the adherens zone consists of closely interwoven bundles of tonofilaments that are anchored to and interconnect the spot desmosomes. Within the large intestine the cytoplasmic microfilaments form a looser and less clearly stratified network which nevertheless retains the same basic organization found in the small intestine. Transmembrane linkers appear to originate within the cytoplasmic plaques of the spot desmosomes, pass through the plasma membranes, and meet in a staggered configuration in the intercellular space; these linkers may thus mediate the actual mechanical coupling between the cytoskeletal networks of tonofilament bundles of adjacent cells. This integrated system of cytoplasmic filaments and intercellular junctions endows the apical cytoplasm with both the flexibility and the stability necessary for the normal functioning of the epithelium.

scholarly journals BRUSH BORDER DEVELOPMENT IN THE INTESTINAL ABSORPTIVE CELLS OF XENOPUS DURING METAMORPHOSIS

1970 ◽  
Vol 44 (1) ◽  
pp. 151-171 ◽  
Author(s):  
Mary A. Bonneville ◽  
Melvyn Weinstock
Keyword(s):  
Electron Microscopy ◽  
Small Intestine ◽  
Brush Border ◽  
Apical Membrane ◽  
Surface Membrane ◽  
Apical Surface ◽  
Absorptive Cells ◽  
Golgi Region ◽  
Macromolecular Architecture

The differentiation of the brush border which makes up the apical free surface of intestinal absorptive cells has been studied by electron microscopy. Specimens of Xenopus small intestine were fixed at various stages during metamorphosis, the time when a new intestinal epithelium forms. The interpretation of details described herein emphasizes the role of "surface-forming" vesicles. These vesicles are thought to provide membrane both for the initial expansion of the apical surface and for the later elongation of the microvilli. The latter are believed to be "molded" around filamentous cores that appear early in differentiation. The cores are attached to the apical membrane and extend vertically into the supranuclear cytoplasm. This interpretation rests chiefly on (a) the resemblance, both in morphology and in staining properties with colloidal thorium, between the membrane that limits the vesicles and that which limits the microvilli and (b) the distribution and time of appearance of the vesicles with respect to development of the microvilli. According to this view, the specific properties of surface membrane reside in preformed units that arise within the supranuclear cytoplasm. This morphogenetic process probably involves participation of the Golgi region as the site where the complex macromolecular architecture of the cell surface is assembled.

Ultrastructure of the Intestinal Absorptive Cells of Fed and Fasted Tadpoles

1970 ◽  
Vol 28 ◽  
pp. 86-87
Author(s):  
Robert Giaquinta ◽  
M. A. Hayat
Keyword(s):  
Electron Microscopy ◽  
Small Intestine ◽  
Fine Structure ◽  
Osmium Tetroxide ◽  
Rana Pipiens ◽  
Ultrastructural Changes ◽  
Amphibian Metamorphosis ◽  
Absorptive Cells ◽  
Food Absorption ◽  
Tissue Specimens

The ultrastructural changes that occur in the intestinal absorptive cells during amphibian metamorphosis have been reported (Bonneville, 1963). These changes accompany a change in diet (from an herbivorous to a carnivorous state) during metamorphosis. Little information is available, however, on the ultrastructural changes in the absorptive cells of amphibians in relation to the state of feeding. This report describes the differences in the fine structure of these cells in the tadpole stage of Rana pipiens during periods of food absorption and fasting.Rana pipiens at tadpole stages were fed an herbivorous diet, and after a period of 48 hr, the animal was dissected and segments of the small intestine were collected for electron microscopy. A second group of tadpoles was fasted for 7 days, and segments of the small intestine were collected. The tissue specimens were immersed in phosphate-buffered glutaraldehyde (3%) for 1 hr at 4C and postfixed with phosphate-buffered osmium tetroxide (2%) for 1 hr at 4C.

The Effect of Aerobic and Anaerobic Physical Training on the Absorptive Cells, Absorption of Carbohydrate and Protein in Small Intestine

2017 ◽  
Vol 3 (6) ◽  
pp. 74
Author(s):  
I Nyoman Kanca ◽  
I Ketut Iwan Swadesi ◽  
I Ketut Yoda ◽  
I Made Agus Wijaya
Keyword(s):  
Body Weight ◽  
Small Intestine ◽  
Absorptive Capacity ◽  
Physical Training ◽  
Percent Level ◽  
Control Group ◽  
Control Group Design ◽  
Absorptive Cells ◽  
Level Of Significance ◽  
Aerobic And Anaerobic

The purpose of this study is to investigate the morphofunctional response of a total number of absorptive cells, and carbohydrate and protein absorption capability in the small intestine of Rattus norvegicus strain Wistar (RNSW) that has been subjected to aerobic and anaerobic physical training based on the morphofunctional physiological paradigm. This study was based on the separate sample pretest-posttest control group design, using a t-test, and multivariate SPSS ten program, with five percent level of significance. The sample consisted of one hundred and twenty, male RNSW, with average age of five months, and body weight of 246-278 grams. They were divided into twelve groups at random, i.e. four pretest groups, two control groups, and six treated groups where different diets were given thirty minutes before undergoing posttest. The experimental animals underwent four weeks physical training (twelve times), three groups were given aerobic physical training by swimming with a burden of three percent fasting body weight, the others three groups received anaerobic physical training by swimming with a burden of nine percent fasting body weight. The experiment was conducted at night, between 7.30 PM to 10.30 PM, in a water with a temperature of    28°C to 30°C. Result of the study revealed: (1) Aerobic and anaerobic physical training, increased the number of absorptive cells (t = -73,281, p = 0,000), and increased the absorptive capacity of carbohydrate and protein (Hotelling’s Trace = 0,244, p = 0,000). (2) There was a difference in the increased absorptive capacity of carbohydrate and protein among groups (Hotelling’s Trace = 0,404a, p = 0,000). Aerobic physical training had less influence than anaerobic physical training on the increased number of absorptive cells, and the absorptive capacity of carbohydrate and protein in the small intestine. In conclusion: (1) Aerobic physical training of swimming with a burden of three percent fasting body weight, and anaerobic physical training of swimming with a burden nine percent fasting body weight correlate with the increase the number of absorptive cells, and carbohydrate and protein absorptive capacity of the small intestine. (2) Anaerobic physical training of swimming with a burden nine percent fasting body weight has better correlation than aerobic physical training of swimming with a burden of three percent fasting body weight with the increased number of absorptive cells, and the absorptive capacity of carbohydrate and protein in the small intestine.

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