scholarly journals NEW METHOD FOR EXPERIMENTAL MODELING OF PANCREAS TRAUMAS FOR WISTAR RATS AND CYTOKINE LEVEL CHANGES IN THESE MODELS

2013 ◽  
Author(s):  
Edgars Zarembo ◽  
Olga Mežale ◽  
Aleksandrs Mikitins ◽  
Leontine Antonovica ◽  
Jekaterina Petla ◽  
...  
Keyword(s):  
Wistar Rats ◽  
Cytokine Level ◽  
New Method ◽  
Experimental Modeling

scholarly journals Liquid-base cytology: a new method for oestral cycle study in wistar's rats

2005 ◽  
Vol 20 (suppl 1) ◽  
pp. 46-49 ◽  
Author(s):  
Rand Randall Martins ◽  
Ney Moura Lemos Pereira ◽  
Telma Maria Araújo Silva
Keyword(s):  
Evans Blue ◽  
Wistar Rats ◽  
New Method ◽  
Hormonal Cycle ◽  
Female Wistar Rats ◽  
Clear Differentiation ◽  
Cellular Types ◽  
Ether Alcohol

OBJECTIVES: The objective of this study was the standardization of a collection technique and staining in liquid-base that allies the pratical and cytological wealth, making possible a larger reproductibility and microscopic easiness. METHODS: Female wistar rats (n=20) were submitted to the daily vaginal collection in saline and fastened washed (ether/alcohol) and stained in suspension with a solution of Evans Blue 0.025%. The sample was pondered by centrifugation and observed under lens of 40 x. RESULTS: The stained smears allowed clear differentiation of the phases of hormonal cycle (diestrus, proestrus, estrus and metestrus); besides the differentiation of the cellular types in relation to its maturation degree having as parameters the cellular size, nucleus / cytoplasm relationship (NCR) and ink reaction. The study demonstrated the existence of three basic cellular patterns: cells with low NCR, accentuated cyanophily and small size; cells with increment in NCR, cyanophilic loss and larger volume cytoplasmatic and without nuclei keratinization cells in squamous aspect. CONCLUSION: The staining of the material allowed, besides the cytological classification, the quantification possibility that would result in a perfected accompaniment of the cycle estrous.

scholarly journals NEW METHOD FOR EXPERIMENTAL MODELING OF PANCREAS TRAUMAS FOR WISTAR RATS AND CYTOKINE LEVEL CHANGES IN THESE MODELS

2013 ◽  
Vol 1 ◽  
pp. 254-257
Author(s):  
Edgars Zarembo ◽  
Olga Mežale ◽  
Aleksandrs Mikitins ◽  
Leontine Antonovica ◽  
Jekaterina Petla ◽  
...  
Keyword(s):  
Acute Pancreatitis ◽  
Blood Serum ◽  
General Anaesthesia ◽  
Plasma Levels ◽  
Wistar Rats ◽  
Experimental Models ◽  
Cytokine Level ◽  
Experimental Modelling ◽  
The Impact ◽  
Degrees Of Severity

The incidence of pancreas traumas (PT) is low; however, lethality in case of PT remains unchangingly high. The aim of the present study is to develop a technically simple, easily repeatable method for experimental modelling of PT of various degrees of severity for Wistar rats and study changes in plasma levels of cytokines (IL-1β; IL-6; TNFα; IL-10; MCP-1; IL-12(p70)) for experimental models. Under general anaesthesia 50 animals were performed laparotomy and were made damages of pancreas tissues of various severity standardized using Crile clamps. 24 h and 72 h after creating PT the samples of blood serum were taken.In autopsy all animals were identified the features of pancreatitis. Severity of pancreatic histologic injury was associated with the impact severity. Plasma MCP-1 levels were significantly (p<0,05) increased in 24 h and 72 h samples. The method with putting Crile clamps under general anaesthesia shall be applied for creation of PT for Wistar rats and let model various degrees of PT severity. MCP-1 might play a pivotal role in inflammatoryresponse of acute pancreatitis.

The Effect of the Porphyrogenic Compound, Hexachlorobenzene, on the Activity of Hepatic Uroporphyrinogen Decarboxylase in the Rat

1976 ◽  
Vol 51 (1) ◽  
pp. 71-80 ◽  
Author(s):  
G. H. Elder ◽  
J. O. Evans ◽  
S. A. Matlin
Keyword(s):  
Rat Liver ◽  
Wistar Rats ◽  
New Method ◽  
Decarboxylase Activity ◽  
Uroporphyrinogen Decarboxylase ◽  
Enzyme Defect ◽  
Female Wistar Rats ◽  
Liver Homogenates

1. A new method for the measurement of uroporphyrinogen decarboxylase (EC 4.1.1.37) in rat liver homogenates, with 5-carboxyl porphyrinogen as substrate, is described. 2. The administration of a diet containing 0·3% (w/w) hexachlorobenzene produces porphyria in female Wistar rats after a delay of at least 4 weeks. The development of porphyria is accompanied by a progressive fall in hepatic uroporphyrinogen decarboxylase activity to 18% of control values after 11 weeks. The features of hexachlorobenzene porphyria are consequences of this enzyme defect. 3. Feeding with hexachlorobenzene did not lead to the accumulation of iron in the liver. It is suggested that hexachlorobenzene or a metabolite acts directly to decrease the activity of the enzyme.

scholarly journals The proposition of a new method to convert formalin cadavers to academic and museology purposes

2021 ◽  
Vol 10 (1) ◽  
pp. e21510111575
Author(s):  
Amanda Teixeira Prata ◽  
Josemberg da Silva Baptista
Keyword(s):  
Qualitative Analysis ◽  
Experimental Model ◽  
Wistar Rats ◽  
New Method ◽  
High Toxicity ◽  
Technical Problems ◽  
Single Solution ◽  
Initial Results

The embalming of a cadaver to study anatomy in humans, animals, and for expositions in biological museums is classically performed by formaldehyde injection. Despite its efficiency and wide application, this method delivers technical problems and high toxicity. Through an experimental model with Wistar rats previously embalmed in formalin, we developed two converting solutions (G1 and G2) to perform a macroscopic and qualitative analysis of the embalming maintenance, the color, the fungus proliferation, the pliability, and the post-conversion dissection of the specimens. This work aims to present the results of this experiment and discuss the data. After 365 days of the experiment, both solutions showed benefits in terms of reduction of toxicity, the use of a single solution to convert, storage without the need for containers with embalming solution, containment of fungus proliferation, and improvement of the color of the organs. Although these are the initial results without full achievement, we consider the G1 solution a suitable and advantageous alternative for the museology area.

Ultrastructural Investigation of Spontaneous Pituitary Adenomas in Aging Sprague-Dawley Rats

1982 ◽  
Vol 40 ◽  
pp. 216-217
Author(s):  
D. J. McComb ◽  
J. Beri ◽  
F. Zak ◽  
K. Kovacs
Keyword(s):  
Microscopic Study ◽  
Pituitary Adenomas ◽  
Wistar Rats ◽  
Microscopic Level ◽  
Sprague Dawley ◽  
Prolactin Cells ◽  
Light Microscopic Level ◽  
Ultrastructural Investigation ◽  
Sprague Dawley Rats ◽  
Long Evans

Investigation of the spontaneous pituitary adenomas in rat have been limited mainly to light microscopic study. Furth et al. (1973) described them as chromophobic, secreting prolactin. Kovacs et al. (1977) in an ul trastructural investigation of adenomas of old female Long-Evans rats, found that they were composed of prolactin cells. Berkvens et al. (1980) using immunocytochemistry at the light microscopic level, demonstrated that some spontaneous tumors of old Wistar rats could contain GH, TSH or ACTH as well as PRL.

Light and electron microscopic investigation of adenohypophyses of germfree, food-restricted, and germfree-food restricted aging, male lobund-wistar rats

1988 ◽  
Vol 46 ◽  
pp. 352-353
Author(s):  
G. Ilse ◽  
K. Kovacs ◽  
N. Ryan ◽  
T. Sano ◽  
L. Stefaneanu ◽  
...  
Keyword(s):  
Wistar Rats ◽  
Microscopic Investigation ◽  
Electron Microscopic Investigation ◽  
Aging Male ◽  
Sprague Dawley ◽  
Electron Microscopic ◽  
Sprague Dawley Rats ◽  
Old Rats ◽  
Ad Libitum ◽  
Microscopic Findings

Germfree state and food restriction have been shown to increase life span and delay tumor occurrence in rats. We report here the histologic, immunocytochemical and electron microscopic findings of adenohypophyses of aging, male Lobund-Wistar rats raised at Lobund Laboratories. In our previous study, the morphologic changes in the adenohypophyses of old rats have been extensively investigated by histology, immunocytochemistry and electron microscopy. Lactotroph adenomas were frequent in Long-Evans and Sprague-Dawley rats, whereas gonadotroph adenomas were frequent in Sprague-Dawley and Wistar rats.Male Lobund-Wistar rats were divided into four groups: 1) conventional, which were raised under normal non-germfree environment and received food ad libitum; 2) germfree-food ad libitum; 3) conventional environment-food restricted and 4) germfree-food restricted. The adenohypophyses were removed from 6-month-, 18-month- and 30-month-old rats. For light microscopy, adenohypophyses were fixed in formalin and embedded in paraffin.

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

Surface epithelial ultrastructure of the polycystic ovary in the BB wistar rat

1986 ◽  
Vol 44 ◽  
pp. 252-253
Author(s):  
R. C. Kaufmann ◽  
F. K. Khosho ◽  
K. S. Amankwah
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Wistar Rats ◽  
Polycystic Ovary ◽  
Wistar Rat ◽  
Polycystic Ovaries ◽  
Chemical Diabetes ◽  
Scanning Electron

Diabetes decreases the fertility of females, but the mechanisms are not completely understood. In our investigations, we have found that 13% of the female BB Wistar rats that spontaneously developed chemical diabetes had persistent estrous. In this study the ovaries of these rats were examined by scanning electron microscopy(SEM) and compared to normal-cycling controls as well as to rats that had developed polycystic ovaries(PCO) by exposure to constant 1ight.

Structural and functional renal alterations in five-sixth nephrectomized rats on unrestricted diet

1986 ◽  
Vol 44 ◽  
pp. 342-343
Author(s):  
I. Stachura ◽  
M. Pardo ◽  
J. Costello ◽  
D.M. Landwehr
Keyword(s):  
Wistar Rats ◽  
Renal Damage ◽  
Standard Diet ◽  
Experimental Conditions ◽  
Phosphate Intake ◽  
Dietary Restrictions ◽  
Severe Reduction ◽  
Male Wistar Rats ◽  
Unrestricted Diet ◽  
Progressive Renal Insufficiency

Under experimental conditions severe reduction of renal mass results in the hyperfiltration of the remaining nephrons leading to a progressive renal insufficiency. Similar changes are observed in patients with various renal disorders associated with a loss of the functioning nephrons. The progression of renal damage is accelerated by high protein and phosphate intake, and may be modified by the dietary restrictions.We studied 50 five-sixth nephrectarrized male Wistar rats on a standard diet (Rodent Laboratory Chow 5001 Ralston Purina Co., Richmond, Indiana; containing 23.4% protein) over a 20 week period.

Parathyroid gland before and after cisplatin treatment

1987 ◽  
Vol 45 ◽  
pp. 860-861
Author(s):  
S.K. Aggarwal ◽  
J.M. Fadool
Keyword(s):  
Parathyroid Gland ◽  
Wistar Rats ◽  
Antitumor Agent ◽  
The Body ◽  
Cross Linking ◽  
Limiting Factor ◽  
Hormonal Changes ◽  
Primary Mechanism ◽  
Before And After ◽  
Dna Strands

Cisplatin (CDDP) a potent antitumor agent suffers from severe toxic side effects with nephrotoxicity being the major dose-limiting factor, The primary mechanism of its action has been proposed to be through its cross-linking DNA strands. It has also been shown to inactivate various transport enzymes and induce hypocalcemia and hypomagnesemia that may be the underlying cause for some of its toxicities. The present is an effort to study its influence on the parathyroid gland for any hormonal changes that control calcium levels in the body.Male Swiss Wistar rats (Crl: (WI) BR) weighing 200-300 g and of 60 days in age were injected (ip) with cisplatin (7mg/kg in normal saline). The controls received saline injections only. The animals were injected (iv) with calcium (0.5 ml of 10% calcium gluconate/day) and were killed by decapitation on day 1 through 5. Trunk blood was collected in heparinized tubes.

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