Early signs of toxicity in testes and sperm of rats exposed to low cadmium doses

2017 ◽  
Vol 33 (7) ◽  
pp. 576-587 ◽  
Author(s):  
Marcela Fátima Medina ◽  
María Celeste Arrieta ◽  
Marcela Noemí Villafañe ◽  
Sandra María Roxana Klyver ◽  
Iris María Aybar Odstrcil ◽  
...  
Keyword(s):  
Wistar Rats ◽  
Chronic Toxicity ◽  
Microscopic Level ◽  
Anthropogenic Activity ◽  
Dependent Manner ◽  
Light Microscopic Level ◽  
Cd Toxicity ◽  
Early Signs ◽  
Transmission Electron ◽  
Outer Dense Fibers

The cadmium (Cd) concentration in the environment has increased as a consequence of anthropogenic activity. The objective of this study was to determine early signs of Cd toxicity in testes and sperm as possible biomarkers. The dose orally administered to Wistar rats was within the range where chronic toxicity can appear. At the light microscopic level, gonads presented preserved cytoarchitecture throughout treatment; however, after the second month, transmission electron microscopy (TEM) revealed disruption of the blood–testis barrier. The study of sperm with light microscopy showed defects in gamete morphology after 2 months of treatment. Another parameter that revealed alteration was sperm motility after 3 months of treatment. TEM was used to analyze the flagellum, which in the midpiece showed aberrant mitochondria and displacement of outer dense fibers in relation to the central axoneme after 2 months. The data obtained were associated with Cd concentration in the testes, an increase in its levels being observed in a time-dependent manner. The results provided in this study demonstrated that early signs of Cd toxicity were observed in gonads and gametes during the second month of the treatment, generating morphological and functional alterations in the sperm that could lead to infertility.

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.

Ultrastructure of Equine Mast Cells in Bronchoalveolar Lavage and Lung

1985 ◽  
Vol 43 ◽  
pp. 552-553
Author(s):  
S. Yamashiro ◽  
T. Bast ◽  
L. Viel ◽  
W. Harris
Keyword(s):  
Mast Cells ◽  
Bronchoalveolar Lavage ◽  
Phosphate Buffer ◽  
Osmium Tetroxide ◽  
Microscopic Level ◽  
Light Microscopic Level ◽  
Inflammatory Lesions ◽  
Transmission Electron ◽  
Bronchoalveolar Washings ◽  
Ultrastructural Characteristics

Examination of the cells in the bronchoalveolar lavage is frequently used for the evaluation of inflammatory lesions of the lower airways and alveoli. Identification of the cells in the lavage is important for differential counts. It has been shown that human mast cells and basophils exhibited similar morphological and histochemical features at light microscopic level and they were collectively called basophiloid cells. Dvorak et al have reviewed the ultrastructural characteristics of these cells in humans, guinea pigs and mice but no such study has been done on horses.Bronchoalveolar washings collected from three adult geldings were centrifuged in Wintrobe tubes, followed by the fixation in 2.5% glutaraldehyde in 1.0 M phosphate buffer at pH 7.2. The samples were post-fixed in 2.0% osmium tetroxide in the phosphate buffer and embedded in Epon 812. Small pieces of lung tissues from three adult, normal horses were also processed for transmission electron microscopy (TEM). In addition, blood samples from two adult horses were processed for TEM.

scholarly journals Chronic Toxicity Study of Aqueous Roots Extract of Rauvolfia vomitoria AFZEL on Haematological Parameters in Wistar Rats

2021 ◽  
Vol 10 (9) ◽  
pp. 567-577
Author(s):  
Roland Patrick N Cho Mama Koné ◽  
Moussa Gbogbo N Guessan Jean Baptiste Oussou ◽  
Angoué Paul Yapo
Keyword(s):  
Oral Administration ◽  
Therapeutic Dose ◽  
Wistar Rats ◽  
Chronic Toxicity ◽  
Haematological Parameters ◽  
High Dose ◽  
Dependent Manner ◽  
Delayed Effects ◽  
Dose Dependent ◽  
Rauvolfia Vomitoria

Rauvolfia vomitoria Afzel. (Apocynaceae) is a plant used in traditional medicine in Côte d'Ivoire for the treatment of several conditions. This work aims to evaluate the effects of repeated oral administration of the aqueous roots extract Rauvolfia vomitoria AFZEL (AERv) on haematological parameters in Wistar rats. Thus, 100 healthy rats were divided into four groups (T, A, B, C) of 20 rats each. The sub groups Ts and Cs from the groups T and C included 10 rats (5 males and 5 females) were formed for a reversibility study. After 6 months (180 days) of the experiment, the sub groups rats Ts and Cs were no more treated with the extract till the 210th day (7 months), day of their sacrifice to verify the reversibility and/or delayed effects of AERv. The erythrocyte, platelet and leukocyte parameters were determined. Results showed that AERv caused a significant decrease in erythrocyte and thrombocyte parameters with the high dose (1000 mg/kg bw) while an increase in leukocyte parameters was noted in a dose-dependent manner. The aqueous extract of the barkless roots is not harmful at the therapeutic dose of 700 mg/kg bw on the haematological parameters. After stoping administration the effects were reversible.

The Fine Structure of Irradiated Mouse Heart

1976 ◽  
Vol 34 ◽  
pp. 184-185
Author(s):  
Vivian V. Yang ◽  
S. Phyllis Stearner
Keyword(s):  
Microscopic Level ◽  
Ultrastructural Changes ◽  
Mouse Heart ◽  
Blood Vessel Wall ◽  
Histopathological Changes ◽  
Light Microscopic Level ◽  
Γ Rays ◽  
Fission Neutrons ◽  
Total Body

The heart is generally considered a radioresistant organ, and has received relatively little study after total-body irradiation with doses below the acutely lethal range. Some late damage in the irradiated heart has been described at the light microscopic level. However, since the dimensions of many important structures of the blood vessel wall are submicroscopic, investigators have turned to the electron microscope for adequate visualization of histopathological changes. Our studies are designed to evaluate ultrastructural changes in the mouse heart, particularly in the capillaries and muscle fibers, for 18 months after total-body exposure, and to compare the effects of 240 rad fission neutrons and 788 rad 60Co γ-rays.Three animals from each irradiated group and three control mice were sacrificed by ether inhalation at 4 days, and at 1, 3, 6, 12, and 18 months after irradiation. The thorax was opened and the heart was fixed briefly in situwith Karnofsky's fixative.

Liquid crystalline ordering of paired helical filaments in neurofibrillary tangles of Alzheimer's disease

1986 ◽  
Vol 44 ◽  
pp. 348-349
Author(s):  
D.F. Clapin ◽  
V.J.A. Montpetit
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Neurofibrillary Tangles ◽  
Liquid Crystalline ◽  
Amyloid Fibrils ◽  
Geometric Analysis ◽  
Paired Helical Filaments ◽  
Microscopic Level ◽  
Light Microscopic Level ◽  
Regular Spacing

Alzheimer's disease is characterized by the accumulation of abnormal filamentous proteins. The most important of these are amyloid fibrils and paired helical filaments (PHF). PHF are located intraneuronally forming bundles called neurofibrillary tangles. The designation of these structures as "tangles" is appropriate at the light microscopic level. However, localized domains within individual tangles appear to demonstrate a regular spacing which may indicate a liquid crystalline phase. The purpose of this paper is to present a statistical geometric analysis of PHF packing.

ultrastructural process of intestinal wound healing

1995 ◽  
Vol 53 ◽  
pp. 1024-1025
Author(s):  
Rick L. Vaughn ◽  
Shailendra K. Saxena ◽  
John G. Sharp
Keyword(s):  
Wound Healing ◽  
Epithelial Cells ◽  
Smooth Muscles ◽  
Microscopic Level ◽  
Light Microscopic Level ◽  
Ileal Mucosa ◽  
Wound Model ◽  
Serosal Surface ◽  
Complex Process ◽  
Orderly Fashion

We have developed an intestinal wound model that includes surgical construction of an ileo-cecal patch to study the complex process of intestinal wound healing. This allows approximation of ileal mucosa to the cecal serosa and facilitates regeneration of ileal mucosa onto the serosal surface of the cecum. The regeneration of ileal mucosa can then be evaluated at different times. The wound model also allows us to determine the rate of intestinal regeneration for a known size of intestinal wound and can be compared in different situations (e.g. with and without EGF and Peyer’s patches).At the light microscopic level it appeared that epithelial cells involved in regeneration of ileal mucosa originated from the enlarged crypts adjacent to the intestinal wound and migrated in an orderly fashion onto the serosal surface of the cecum. The migrating epithelial cells later formed crypts and villi by the process of invagination and evagination respectively. There were also signs of proliferation of smooth muscles underneath the migratory epithelial cells.

Ultrastorcture of Cerebellar Purkinje Cells in Rats Subjected To Partial Global Cerebral Ischemia

1985 ◽  
Vol 43 ◽  
pp. 674-675
Author(s):  
R.V.W. Dimlich ◽  
M.H. Biros
Keyword(s):  
Cerebral Ischemia ◽  
Purkinje Cells ◽  
Cell Types ◽  
Microscopic Level ◽  
Global Cerebral Ischemia ◽  
Light Microscopic Level ◽  
Cerebellar Damage ◽  
Cerebellar Injury ◽  
Cerebellar Purkinje Cells ◽  
Cell Changes

In severe cerebral ischemia, Purkinje cells of the cerebellum are one of the cell types most vulnerable to anoxic damage. In the partial (forebrain) global ischemic (PGI) model of the rat, Paljärvi noted at the light microscopic level that cerebellar damage is inconsistant and when present, milder than in the telencephalon, diencephalon and rostral brain stem. Cerebellar injury was observed in 3 of 4 PGI rats following 5 minutes of reperfusion but in none of the rats after 90 min of reperfusion. To evaluate a time between these two extremes (5 and 90 min), the present investigation used the PGI model to study the effects of ischemia on the ultrastructure of cerebellar Purkinje cells in rats that were sacrificed after 30 min of reperfusion. This time also was chosen because lactic acid that is thought to contribute to ischemic cell changes in PGI is at a maximum after 30 min of reperfusion.

An ultrastructural study on the shark liver

1990 ◽  
Vol 48 (3) ◽  
pp. 512-513
Author(s):  
Masako Yamada ◽  
Yutaka Tanuma
Keyword(s):  
Portal Vein ◽  
Kupffer Cells ◽  
Ultrastructural Study ◽  
Lipid Droplets ◽  
Microscopic Level ◽  
The Other ◽  
Fish Stock ◽  
Structural Studies ◽  
Light Microscopic Level ◽  
Perfusion Fixation

Although many fine structural studies on the vertebrate liver have been reported on mammals, avians, reptiles, amphibians, teleosts and cyclostomes, there are no studies on elasmobranchii liver except one by T. Ito etal. (1962) who studied it on light microscopic level. The purpose of the present study was to as certain the ultrastructural details and cytochemical characteristics of normal elasmobranchii liver and was to compare with the other higher vertebrate ones.Seventeen Scyliorhinus torazame, one kind of elasmobranchii, were obtained from the fish stock of the Ueno Zoo aquarium, Ueno, Tokyo. The sharks weighing about 300-600g were anesthetized with MS-222 (Sigma), and the livers were fixed by perfusion fixation via the portal vein according to the procedure of Y. Saito et al. (1980) for 10 min. Then the liver tissues were immersed in the same fixative for 2 hours and postfixed with 1% OsO4-solution in 0.1 Mc acodylate buffer for one hour. In order to make sure a phagocytic activity of Kupffer cells, latex particles (0.8 μm in diameter, 0.05mg/100 g b.w.) were injected through the portal vein for one min before fixation. For preservation of lipid droplets in the cytoplasm, a series of these procedure were performed under ice cold temperature until the end of dehydration.

scholarly journals Antitumor Potential of Green Synthesized ZnONPs Using Root Extract of Withania somnifera against Human Breast Cancer Cell Line

Separations ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 8
Author(s):  
Kollur Shiva Prasad ◽  
Shashanka K Prasad ◽  
Ravindra Veerapur ◽  
Ghada Lamraoui ◽  
Ashwini Prasad ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Cell Line ◽  
Withania Somnifera ◽  
Root Extract ◽  
Dependent Manner ◽  
Sem Images ◽  
Xrd Pattern ◽  
Transmission Electron

Herein we report the synthesis of zinc oxide nanoparticles (ZnONPs) using Withania somnifera root extract (WSE) as an effective chelating agent. The microscopic techniques viz., X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and selected area electron diffraction (SAED) were employed to analyze the as-obtained ZnONPs. The crystalline planes observed from the XRD pattern agrees with the hexagonal wurtzite structure of the as-prepared ZnONPs. The aggregations and agglomerations observed in the SEM images indicated that the size of the as-prepared ZnONPs was between 30 and 43 nm. The interplanar distance between the lattice fringes observed in the HRTEM image was found to be 0.253 nm, which is in good agreement with the (100) plane obtained in the XRD pattern. Furthermore, the anti-breast cancer cytotoxic evaluation was carried out using the MCF-7 cell line, and the results showed significant cytotoxic effects in a dose-dependent manner.

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