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Anwer SS, Hassanin HM. The possible protective role of selenium on the visual cortex of adult albino rat on exposure to potassium dichromate. Ultrastruct Pathol 2023; 47:495-508. [PMID: 37936280 DOI: 10.1080/01913123.2023.2259455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Accepted: 09/12/2023] [Indexed: 11/09/2023]
Abstract
The visual cortex is very important in mammals for processing of visual information. Exposure to heavy metals such as potassium dichromate poses serious health threat to human beings. The aim of this work is to study the effect of potassium dichromate on the visual cortex of adult albino rat and also to identify the possibility of selenium as protective agent against toxicity of potassium dichromate. A total number of 40 adult albino rats weighting (200-250) gm were used. They divided into four groups: control group, potassium dichromate received group, potassium dichromate and selenium received group and selenium received group. The rats received treatment for 6 weeks. After 6 weeks, they were sacrificed. The present study showed that potassium dichromate causes degeneration of granular neurons in layer IV and pyramidal neurons in layer V. Morphometric results revealed statistically significant decrease in the number of granule and pyramidal cells in potassium dichromate received group as compared with control group. Most of degenerative changes are improved by selenium.
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Affiliation(s)
- Sally S Anwer
- Human Anatomy and Embryology Department, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Hala Mohamed Hassanin
- Human Anatomy and Embryology Department, Faculty of Medicine, Assiut University, Assiut, Egypt
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2
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Osmanov YI, Kogan EA, Gadzhieva ZK, Prochenko DD. [Morphological and molecular portrait hybrid renal tumors]. Urologiia 2023:113-116. [PMID: 37850290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 10/19/2023]
Abstract
A hybrid tumor is not officially included in the latest International Histological Classification of Kidney Tumors (WHO, 2022), however, according to the literature, a number of researchers still consider a hybrid tumor as an independent nosological unit. In this regard, the development of morphological and molecular genetic criteria for a hybrid tumor, today, is the main task in the differential diagnosis of oncocytic renal tumors. AIM Our aim was to carry out to identify immunohistochemical, ultrastructural features and determine the molecular profile of hybrid renal tumors. PATIENTS AND METHODS The study was performed on the surgical material of 12 patients with a hybrid tumor of the kidney. Immunohistochemical study was carried out on paraffin sections according to the standard protocol. Antibodies CK7, CD117, Cyclin D1, EpCAM, Caveolin1, EABA, and S100A1 were used. To study tumor tissues on semi-thin and ultra-thin sections, an electron microscope Philips TECNAI 12 BioTwinD-265 is used. For in situ fluorescent diagnostic detection, defined centromere probes, LSI 13/21, LSI N25 /LSI ARSA and TelVysion telomeric probe. RESULTS In some cases, a hybrid tumor is represented by a solid structure of monomorphic oxyphilic cells with a characteristic immuno-, ultraphenotype and molecular profile. CONCLUSION The results of a comprehensive study confirm that the hybrid tumor is an intermediate link in the process of malignant transformation of oncocytoma into chromophobe renal cell carcinoma.
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Affiliation(s)
- Y I Osmanov
- Institute of Clinical Morphology and Digital Pathology of the Federal State Autonomous Educational Institution of Higher Education I.M. Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation, Moscow, Russia
- Department for the Analysis of Personnel Policy, Educational Programs and Scientific Research of the National Medical Research Center on the profile Urology of the Federal State Autonomous Educational Institution of Higher Education I.M. Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation, Moscow, Russia
| | - E A Kogan
- Institute of Clinical Morphology and Digital Pathology of the Federal State Autonomous Educational Institution of Higher Education I.M. Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation, Moscow, Russia
- Department for the Analysis of Personnel Policy, Educational Programs and Scientific Research of the National Medical Research Center on the profile Urology of the Federal State Autonomous Educational Institution of Higher Education I.M. Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation, Moscow, Russia
| | - Z K Gadzhieva
- Institute of Clinical Morphology and Digital Pathology of the Federal State Autonomous Educational Institution of Higher Education I.M. Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation, Moscow, Russia
- Department for the Analysis of Personnel Policy, Educational Programs and Scientific Research of the National Medical Research Center on the profile Urology of the Federal State Autonomous Educational Institution of Higher Education I.M. Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation, Moscow, Russia
| | - D D Prochenko
- Institute of Clinical Morphology and Digital Pathology of the Federal State Autonomous Educational Institution of Higher Education I.M. Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation, Moscow, Russia
- Department for the Analysis of Personnel Policy, Educational Programs and Scientific Research of the National Medical Research Center on the profile Urology of the Federal State Autonomous Educational Institution of Higher Education I.M. Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation, Moscow, Russia
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3
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Yang S, Shi Y, Wu J, Chen Q. Ultrastructural study of the duck brain infected with duck Tembusu virus. Front Microbiol 2023; 14:1086828. [PMID: 36891400 PMCID: PMC9987711 DOI: 10.3389/fmicb.2023.1086828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Accepted: 01/31/2023] [Indexed: 02/22/2023] Open
Abstract
Duck Tembusu virus (DTMUV) is an emerging avian flavivirus characterized by causing severe ovaritis and neurological symptoms in ducks. The pathology of the central nervous system (CNS) caused by DTMUV is rarely studied. This study aimed to systematically investigate the ultrastructural pathology of the CNS of ducklings and adult ducks infected with DTMUV via transmission electron microscopy technology at a cytopathological level. The results showed that DTMUV caused extensive lesions in the brain parenchyma of ducklings and slight damage in adult ducks. The neuron was the target cell of DTMUV, and virions were mainly observed in their cisternae of rough endoplasmic reticulum and the saccules of Golgi apparatus. The neuron perikaryon showed degenerative changes where the membranous organelles gradually decomposed and disappeared with DTMUV infection. Besides neurons, DTMUV infection induced marked swelling in astrocytic foot processes in ducklings and evident myelin lesions in ducklings and adult ducks. The activated microglia were observed phagocytizing injured neurons, neuroglia cells, nerve fibers, and capillaries after the DTMUV infection. Affected brain microvascular endothelial cells were surrounded by edema and had increased pinocytotic vesicles and cytoplasmic lesions. In conclusion, the above results systematically describe the subcellular morphological changes of the CNS after DTMUV infection, providing an ultrastructural pathological research basis for DTMUV-induced neuropathy.
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Affiliation(s)
- Sheng Yang
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, China
| | - Yonghong Shi
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, China.,Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Jingxian Wu
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, China
| | - Qiusheng Chen
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, China
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Gauthier Y, Lepreux S, Cario‐Andre M, Rambert J, Dakdaki A, Lafon M, Abouqal R, Benzekri L. Varicella-zoster virus in actively spreading segmental vitiligo skin: Pathological, immunochemical, and ultrastructural findings (a first and preliminary study). Pigment Cell Melanoma Res 2023; 36:78-85. [PMID: 36112095 PMCID: PMC10092484 DOI: 10.1111/pcmr.13064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Revised: 07/07/2022] [Accepted: 08/15/2022] [Indexed: 12/31/2022]
Abstract
Segmental vitiligo (SV) is a unilateral subtype of vitiligo which is clinically characterized by a cutaneous depigmentation and histologically by a melanocyte loss from the epidermis and hair follicle reservoirs. To date, its pathogenesis remains a mystery. In many cases, this skin depigmentation shares several clinical features and dysfunctions with herpes zoster (HZ). So, for the first time, we examined whether any nucleus and cell fusion associated with a positive immunolabelling of varicella-zoster virus (VZV) and VZV mature virions could be found in SV skin samples as in herpes zoster (HZ). A total of 40 SV samples were used for histological and immunochemical studies. Control samples were obtained from three HZ, and 10 generalized vitiligo lesions. For ultrastructural study, three recent SV and one HZ as controls were recruited. Here, we report that nuclear fusion in epidermal cells were statistically associated with recent SV (p < .001), whereas syncytia formation was associated with long-lasting SV (p = .001). A positive detection of VZV antigen was statistically associated in the epidermis with recent SV and in the dermis with long-lasting SV (p = .001). Finally, the discovery of mature virions in 3/3 recent SV samples provides additional arguments for our viral hypothesis.
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Affiliation(s)
- Yvon Gauthier
- Vitiligo and Melasma Research Association (V.M.R.A.)BordeauxFrance
| | | | - Muriel Cario‐Andre
- Bordeaux University, INSERM, BRIC, U1312BordeauxFrance
- National Reference Center for Rare skin DiseasesBordeaux University HospitalBordeauxFrance
- AquidermBordeauxFrance
| | - Jérome Rambert
- National Reference Center for Rare skin DiseasesBordeaux University HospitalBordeauxFrance
| | - Adrien Dakdaki
- Tumor Bank and Tumor Biology LaboratoryCHU BordeauxPessacFrance
| | - Marie‐Edith Lafon
- Department of Virology Bordeaux University HospitalBordeaux University, CNRS, UMR5234BordeauxFrance
| | - Redouane Abouqal
- Laboratory of Biostatistics, Clinical Research and EpidemiologyMohammed V University in Rabat, Acute Medical Unit, Ibn Sina Teaching HospitalRabatMorocco
| | - Laila Benzekri
- Dermatology Department, Ibn Sina Teaching HospitalMohammed V University in Rabat, Pigmentary Disorders Outpatient ClinicRabatMorocco
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Karachrysafi S, Fadel G, Kapourani V, Akritidou F, Anastasiadou P, Papamitsou T, Sioga A, Fadel E. Histological study of eyelid hidrocystoma: A clinical case. SAGE Open Med Case Rep 2022; 10:2050313X221097770. [PMID: 35573100 PMCID: PMC9102149 DOI: 10.1177/2050313x221097770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Accepted: 04/13/2022] [Indexed: 11/16/2022] Open
Abstract
Hidrocystomas are benign lesions with frequent localization on the eyelids and common appearance as isolated translucent cystic lesions. The multiple and bilateral localization has been associated with systemic diseases or epidermodysplasia. The histological and ultrastructural study contributes to the distinction in eccrine or apocrine. In this clinical case, multiple bilateral skin lesions of the eyelids were removed surgically from a 55-year-old male patient with free medical history. The lesions were fully removed surgically without rupture of the cysts. The obtained tissues were fixed and prepared for an anatomical pathology study as well as observation under the electron microscope. The histological study revealed cystic lesions with low cuboid epithelium and presence of cells and collagen fibrils, while the ultrastructural study also revealed the presence of apoptotic and secretory cells as well as vacuolization of the cytoplasm. No relapse of the lesions was obtained. In conclusion, the histological and ultrastructural study of multiple hidrocystomas can highlight special features that help to better classify and diagnose eccrine or apocrine hidrocystomas, while surgical removal without rupture of the cyst can prevent reappearance.
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Affiliation(s)
- Sofia Karachrysafi
- Department of Ophthalmology, General Hospital G. Papanikolaou, Thessaloniki, Greece.,Laboratory of Histology-Embryology, Department of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Georgios Fadel
- Department of Ophthalmology, General Hospital G. Papanikolaou, Thessaloniki, Greece
| | - Viktoria Kapourani
- Department of Ophthalmology, General Hospital G. Papanikolaou, Thessaloniki, Greece
| | - Fani Akritidou
- Laboratory of Histology-Embryology, Department of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Pinelopi Anastasiadou
- Department of Oral Medicine/Pathology, School of Dentistry, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Theodora Papamitsou
- Laboratory of Histology-Embryology, Department of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Antonia Sioga
- Laboratory of Histology-Embryology, Department of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Elie Fadel
- Department of Ophthalmology, General Hospital G. Papanikolaou, Thessaloniki, Greece
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Castiella T, Iruzubieta P, Monleón E, Cardiel MJ, Gómez-Vallejo J, Monzón M, Junquera MC. Stromal cells of giant cell tumor of bone show primary cilia in giant cell tumor of bone. Microsc Res Tech 2021; 85:1065-1074. [PMID: 34761465 DOI: 10.1002/jemt.23976] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 09/04/2021] [Accepted: 10/26/2021] [Indexed: 01/02/2023]
Abstract
Giant cell tumor of bone (GCTB) is a locally aggressive primary bone neoplasm composed by tumoral stromal cells (SCs) and a reactive component that consists of monocytic/histiocytic cells that give rise by fusion to osteoclast-like multinucleated cells. Recently, specific Histone 3.3 mutations have been demonstrated in SCs of GCTB. Many of the pathways related to bone proliferation and regulation depend on the primary cilium, a microtubule-based organelle that protrudes outside the cell and acts as a sensorial antenna. In the present work, we aimed to study the presence and role of primary cilia in GCTB. Ultrastructural, immunohistochemical, and immunofluorescence studies were performed in order to demonstrate, for the first time, that the primary cilium is located in spindle-shaped SCs of GCTB. Moreover, we showed Hedgehog (Hh) signaling pathway activation in these cells. Hence, primary cilia may play a relevant role in GCTB tumorogenesis through Hh signaling activation in SCs. RESEARCH HIGHLIGHTS: Transmission electron microscopy allows describing and differentiating cellular subpopulations in giant cell tumor of bone (GCTB). The primary cilium is present in some tumoral stromal cells of GCTB. Hedgehog signalling is activated in these cells.
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Affiliation(s)
- Tomás Castiella
- Department of Pathology, Hospital Clínico Universitario Lozano Blesa, Zaragoza, Spain.,Institute for Health Research Aragón (IIS), Zaragoza, Spain
| | - Pablo Iruzubieta
- Department of Human Anatomy and Histology, Faculty of Medicine, University of Zaragoza, Zaragoza, Spain
| | - Eva Monleón
- Department of Human Anatomy and Histology, Faculty of Medicine, University of Zaragoza, Zaragoza, Spain.,Institute for Health Research Aragón (IIS), Zaragoza, Spain
| | - Mª José Cardiel
- Department of Pathology, Hospital Clínico Universitario Lozano Blesa, Zaragoza, Spain
| | - Jesús Gómez-Vallejo
- Department of Traumatology and Orthopaedic Surgery, Hospital Clínico Universitario Lozano Blesa, Zaragoza, Spain
| | - Marta Monzón
- Department of Human Anatomy and Histology, Faculty of Medicine, University of Zaragoza, Zaragoza, Spain.,Institute for Health Research Aragón (IIS), Zaragoza, Spain
| | - Mª Concepción Junquera
- Department of Human Anatomy and Histology, Faculty of Medicine, University of Zaragoza, Zaragoza, Spain.,Institute for Health Research Aragón (IIS), Zaragoza, Spain
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Kfoury H, Arafah M. The pathological spectrum associated with the ultrastructural finding of thin glomerular basement membrane: A tertiary medical city experience and review of the literature. Ultrastruct Pathol 2016; 41:51-54. [PMID: 28029267 DOI: 10.1080/01913123.2016.1258021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
BACKGROUND Thin glomerular basement membrane (GBM) has been noted in several glomerular diseases including IgA nephropathy, focal segmental glomerulosclerosis (FSGS), Fabry's disease, and Alport's syndrome. We conducted this study to investigate the pathological ultrastructural spectrum of thin GBMs, to identify associated diseases, and to measure the GBM thickness in thin GBMs in our adult population. MATERIALS AND METHODS All renal biopsies with thin GBM, diagnosed between 2010 and 2016, were retrieved and reviewed. RESULTS Of 24 cases, 50.0% were diagnosed with FSGS, 12.5% with IgA nephropathy, 8.3% with tubulointerstitial nephritis, 4.2% with acute thrombotic microangiopathy, 4.2% with focal global sclerosis, 4.2% with lupus nephritis, and 16.7% with only thin GBM disease. Mean GBM thickness was 213.4 ± 24.7 nm. Mean interstitial fibrosis/tubular atrophy percentage (IF/TA) was 27.9 ± 22.2%. There was no significant correlation between GBM thickness and patients' age or IF/TA percentage. CONCLUSION The association of thin GBM with FSGS and IgA nephropathy is high. Morphometric analysis of the GBM thickness should be made routine, noting that ethnic variations in the GBM thickness are reported. Cases of thin GBM should be reported to facilitate proper diagnosis and institute the most appropriate treatment.
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Affiliation(s)
- Hala Kfoury
- a Department of Pathology and Laboratory Medicine , College of Medicine, King Saud University and King Khalid University Hospital , Riyadh , Saudi Arabia
| | - Maria Arafah
- a Department of Pathology and Laboratory Medicine , College of Medicine, King Saud University and King Khalid University Hospital , Riyadh , Saudi Arabia
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Aamri FE, Caballero MJ, Real F, Acosta F, Déniz S, Román L, Padilla D. Streptococcus iniae in gilthead seabream (Sparus aurata, L.) and red porgy (Pagrus pagrus, L.): ultrastructural analysis. Vet Pathol 2014; 52:209-12. [PMID: 24496225 DOI: 10.1177/0300985814520638] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Streptococcosis caused by Streptococcus iniae has become one of the most serious marine and freshwater aquatic diseases in the past decade, causing large losses in farmed and wild fish worldwide. In this study, we performed an ultrastructural study of major lesions in gilthead seabream Sparus aurata and red porgy Pagrus pagrus experimentally infected with the S. iniae IUSA-1 strain, isolated in a natural outbreak in Spain in the mentioned species. The transmission electron micrographs revealed the resistance of this pathogen inside the phagosome, indicating that the macrophage may provide a significant bacterial reservoir for continuing infection, disease dissemination, and tissue injury by crossing the blood-brain barrier.
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Affiliation(s)
- F El Aamri
- Institute of Animal Health (IUSA), University of Las Palmas de Gran Canaria, Arucas, Las Palmas, Spain
| | - M J Caballero
- Institute of Animal Health (IUSA), University of Las Palmas de Gran Canaria, Arucas, Las Palmas, Spain
| | - F Real
- Institute of Animal Health (IUSA), University of Las Palmas de Gran Canaria, Arucas, Las Palmas, Spain
| | - F Acosta
- Institute of Animal Health (IUSA), University of Las Palmas de Gran Canaria, Arucas, Las Palmas, Spain
| | - S Déniz
- Institute of Animal Health (IUSA), University of Las Palmas de Gran Canaria, Arucas, Las Palmas, Spain
| | - L Román
- Institute of Animal Health (IUSA), University of Las Palmas de Gran Canaria, Arucas, Las Palmas, Spain
| | - D Padilla
- Institute of Animal Health (IUSA), University of Las Palmas de Gran Canaria, Arucas, Las Palmas, Spain
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Abstract
BACKGROUND/AIM Amiodarone, a class III antiarrhythmic drug, has been found to be effective in the management of patients with life-threatening ventricular arrhythmias. The aim of this study was to test whether the co administration of vitamin-E with amiodarone can reduce amiodarone-induced liver damage. MATERIALS AND METHODS Twelve male albino rats were divided into three groups (ml vegetable oil/day by oral gavages daily for 2 weeks and were used as control group. The rats of the second group received 5.4 mg amiodarone/100 gm rat dissolved in vegetable oil daily by oral gavages for 2 weeks. In the third group, the rats received 5.4 mg amiodarone and 5 mg vitamin-E/100 gram rat dissolved in 2 ml vegetable oil by oral gavages daily for 2 weeks. Two weeks after treatment, the rats were sacrificed and liver specimens were immediately taken and processed for transmission electron microscopic examinations. RESULTS Sections from the rat liver receiving amiodarone examined by electron microscopy showed disrupted hepatocytes with increased vacuolations. Degenerated organelles and disrupted nuclei were observed. The microvilli of bile canaliculi were disrupted and the hepatocytes showed increased lipid contents. Both endothelial cells and Kupffer cells were damaged. Phospholipids inside the mitochondria showed a loss of cristae. Sections from the liver of rats received amiodarone and vitamin-E showed lesser effects, especially in depositions of phospholipids in the mitochondria and the whole organelles and the nucleus showed minor damage in comparison to the previous group. CONCLUSION Milder hepatotoxic effects are seen in rats administered amiodarone and vitamin E simultaneously suggesting that vitamin-E may play a role in amelioration of the effects of amiodarone.
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Affiliation(s)
- Mohamed Samir A. Zaki
- Department of Anatomy, Faculty of Medicine, King Khalid University, Abha, Saudi Arabia,Address for correspondence: Prof. Mohamed Samir A. Zaki, College of Medicine, Abha, Saudia, P.O.641 Abha, Saudi Arabia. E-mail:
| | - Refaat A. Eid
- Department of Pathology (Electron Microscopy Unit), Faculty of Medicine, King Khalid University, Abha, Saudi Arabia
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Abstract
A strain of non-pathogenic Fusarium oxysporum Schlecht. emend, Snyd. & Hans. has been selected for its capacity to reduce the incidence of Fusarium wilt of tomato. Among the possible modes of action of this strain, competition with the pathogen for the colonization of the root surface and tissues has been proposed. In order to study the pattern of root colonization, young Lycopersicon etculentum Miller (tomato) plants grown in a nutrient solution were inoculated by a suspension of F. oxysporum microconidia and processed at time-intervals for microscopic observations. The fungal strain was transformed with the Gus reporter gene to facilitate the observations. Within 24 h of inoculation the root surface was colonized by a dense network of hyphae, with the exception of the apex, which was colonized only after 48 h. A few hyphae were observed penetrating into the epidermis, leading to the internal colonization of the root cortex. This colonization was always discontinuous, since defence reactions of the plant limited the extension of the fungus. The barrier formed by thickenings and coilings of the cell walls and hypertrophied cells was most frequently observed in the external cortex and, sometimes, deeper in the internal cortex, close to the vessels which were never colonized. Typical defence reactions such as wall appositions, intercellular plugging and intracellular osmiophilic deposits, were frequently observed. This is the first report, based on microscopic observations, of the capacity of a non-pathogenic strain of F. oxysporum to colonize roots of tomato.
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Affiliation(s)
- Chantal Olivain
- Laboratoire de Recherches sur la Flore pathogène dans le sol INRA-CMSE, BV 1540, 17 rue Sully, 21034 DIJON Cedex, France
| | - Claude Alabouvette
- Laboratoire de Recherches sur la Flore pathogène dans le sol INRA-CMSE, BV 1540, 17 rue Sully, 21034 DIJON Cedex, France
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