Abstract:
:The identification, recording, and interpretation of nasal lesions can be a difficult task in toxicology studies. The objective of this article is to provide some guidelines for approaches to nasal toxicologic pathology, based on the author's experience and information available in the published literature. Identification of treatment-induced nasal lesions requires adequate in-life and post-mortem observation, and thorough histopathology. Histopathologic assessment is dependent upon high quality and consistent histologic preparations, adequate knowledge of nasal anatomy and histology, and experience with the range of aging, background, and treatment-induced lesions that may be encountered. In recent years there has been a marked increase in the number of articles reporting nasal pathology in studies for which materials were delivered by inhalation and by non-inhalation routes. Because of the increasing size of this database, it is recommended that standardized and systematic nomenclature be developed for these changes. The following points are considered to be particularly important: 1) alert animal care staff to clinical changes that may indicate nasal lesions; 2) screen animals for nasal disease, such as nasal nematodes in non-human primates; 3) record gross lesions during trimming of decalcified nasal tissues; 4) save spare tissue in fixative; 5) remember that the normal bilateral symmetry of the nose can be a valuable diagnostic aid; 6) avoid excessive lumping or splitting of diagnoses; 7) develop a logical order for recording of lesions (the approach preferred by the author is degenerative, inflammatory, regenerative, proliferative, for each of the epithelial types in a logical anatomical order, such as squamous, transitional, respiratory, and olfactory); 8) accurately determine the site of toxic responses; 9) keep a notebook of interesting or important observations and ideas if you are using a computerized data acquisition system; 10) consider the role of factors that may account for lesion distribution (regional dose and tissue susceptibility) during interpretation of tissue responses; and 11) during preparation of the descriptive narrative, clearly define what occurred, where and when it occurred, and consider the use of simple anatomical diagrams as an adjunct to the text. Adequate lesion detection and characterization by the toxicologic pathologist is often a critical feature of toxicology studies, and can play an important role in determination of human risks associated with exposure to xenobiotics. A systematic but flexible approach is recommended.
journal_name
Toxicol Patholjournal_title
Toxicologic pathologyauthors
Morgan KTdoi
10.1177/0192623391019004-103subject
Has Abstractpub_date
1991-01-01 00:00:00pages
337-51issue
4 Pt 1eissn
0192-6233issn
1533-1601journal_volume
19pub_type
杂志文章,评审abstract::Studies were carried out on microsomes isolated from the highly differentiated (slow-growing) Morris hepatoma 9618A, on microsomes and plasma membranes from the poorly differentiated (fast-growing) Morris hepatoma 3924A, and rat liver used as control. The lipid composition (phospholipid and cholesterol content, degree...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1177/019262338401200404
更新日期:1984-01-01 00:00:00
abstract::Bioabsorbable implants can be advantageous for certain surgical tissue bioengineering applications and implant-assisted tissue repair. They offer the obvious benefits of nonpermanence and eventual restoration of the native tissue's biomechanical and immunological properties, while providing a structural scaffold for h...
journal_title:Toxicologic pathology
pub_type: 杂志文章,评审
doi:10.1177/0192623318816681
更新日期:2019-04-01 00:00:00
abstract::Minipigs are now used in greater numbers in contract research organizations (CROs) as well as in the pharmaceutical industry. Most CROs or pharmaceutical companies use the Göttingen minipig, which displays a number of important background lesions. This review will discuss some of the more infrequent minipig background...
journal_title:Toxicologic pathology
pub_type: 杂志文章,评审
doi:10.1177/0192623315622423
更新日期:2016-04-01 00:00:00
abstract::Ocular medical devices (MDs) represent a very wide and promising field of human ophthalmology. In preclinical studies evaluating the safety and/or performance of these ocular MDs, the choice of histologic technique and the focus of the histopathologic evaluation method should take into consideration the following aspe...
journal_title:Toxicologic pathology
pub_type: 杂志文章,评审
doi:10.1177/0192623318813533
更新日期:2019-04-01 00:00:00
abstract::Chronic ingestion of arsenic is associated with increased incidence of respiratory and cardiovascular diseases. To investigate the role of arsenic in early events in vascular pathology, C57BL/6 mice ingested drinking water with or without 50 ppb sodium arsenite (AsIII) for four, five, or eight weeks. At five and eight...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1177/0192623308323919
更新日期:2008-10-01 00:00:00
abstract::Renal tubular hyaline droplets developed in male and female F344 rats bearing a rat fibrosarcoma-derived transplantable tumor (SS). The droplets accumulated exclusively in the proximal renal tubular epithelia as eosinophilic granules of various sizes in hematoxylin and eosin-stained sections. The granules stained brig...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1177/019262339802600517
更新日期:1998-09-01 00:00:00
abstract::The nonnucleoside inhibitor (NNI) of HIV-1 reverse transcriptase, PHI-346 (N-[2-(1-cyclohexenyl)ethyl]-N'-[2-(5-bromopyridyl)]-thiourea), is a dual-function spermicidal agent with potent anti-HIV activity against drug-sensitive as well as drug-resistant HIV-1 strains with genotypic and phenotypic NNI resistance. PHI-3...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1080/01926230290168551
更新日期:2002-11-01 00:00:00
abstract::Repeated intraperitoneal injections of crocidolite asbestos fibers induced diffuse malignant mesotheliomas in mice. A series of mesothelial cell lines was isolated from mice at different stages in the development of these tumors. The cell lines isolated from mice with mesotheliomas recapitulated their growth pattern i...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1177/019262339702500605
更新日期:1997-11-01 00:00:00
abstract::The administration of mesenchymal stromal cells (MSCs) provides an exciting emerging therapeutic modality for the treatment of peripheral arterial disease, a condition that is associated with critical limb ischemia as its end stage. Placental-derived MSCs, termed PLX-PAD cells, are stable adhesive stromal cells isolat...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1177/0192623309338383
更新日期:2009-08-01 00:00:00
abstract::Congenital anomalies of the alimentary tract are rare lesions in laboratory animals. We describe a congenital cyst attached to the greater curvature of the forestomach in a B6C3F1 mouse. The inner surface of the cyst was mostly covered with cuboidal or pseudostratified ciliated epithelium and was focally covered with ...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1177/019262339902700514
更新日期:1999-09-01 00:00:00
abstract::One application of genomics in drug safety assessment is the identification of biomarkers to predict compound toxicity before it is detected using traditional approaches, such as histopathology. However, many genomic approaches have failed to demonstrate superiority to traditional methods, have not been appropriately ...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1080/01926230500321213
更新日期:2005-01-01 00:00:00
abstract::Groups of C57BL6 mice of each sex were assigned to one of 2 dietary regimens, ad libitum (AL) or dietary restriction (DR), to study effects of food restriction on body weight, survival, and neoplasia. The AL and DR groups were subdivided into a scheduled sacrifice group for examination at 6-mo intervals, and a lifetim...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1177/019262339502300503
更新日期:1995-09-01 00:00:00
abstract::This brief review summarizes our current understanding of vasculitis mediated by phlogistic immune complexes. The Arthus reaction and serum sickness both represent experimental models for immune complex disease. Immune complex phenomena occur in conjunction with C3 deficiency of dogs during canine distemper virus infe...
journal_title:Toxicologic pathology
pub_type: 杂志文章,评审
doi:10.1177/019262338901700107
更新日期:1989-01-01 00:00:00
abstract::Changes in p53 expression, apoptosis and cell proliferation after treatment with 4-hydroxyaminoquinoline 1-oxide (4HAQO) were investigated in the rat pancreas and liver, target and nontarget organs for tumorigenesis, respectively. Male rats were given a single intravenous injection of 4HAQO at a dose of 20 mg/kg body ...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1080/01926230390241855
更新日期:2003-11-01 00:00:00
abstract::Two-year toxicity studies were conducted on the widely used herbal products, goldenseal and milk thistle, in male and female F344/N rats and B6C3F1 mice. With goldenseal root powder, the primary finding was an increase in liver tumors in rats and mice, and with milk thistle extract, a decrease in spontaneous backgroun...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1177/0192623310394211
更新日期:2011-02-01 00:00:00
abstract::Exposed to a diverse array of potentially noxious agents, the respiratory tract is protected by a highly developed innate defense system. Physiologically regulated epithelial ion and water transport coordinated with mucin secretion, beating cilia, and cough results in continuous flow of fluid and mucus over airway sur...
journal_title:Toxicologic pathology
pub_type: 杂志文章,评审
doi:10.1080/01926230601060025
更新日期:2007-01-01 00:00:00
abstract::Many common inflammatory disorders are characterized by the infiltration of neutrophils across epithelial lined (mucosal) surfaces resulting in disruption of critical barrier function that protects from microbes and noxious agents. In such conditions, disease symptoms are complex but directly related to leukocyte effe...
journal_title:Toxicologic pathology
pub_type: 杂志文章,评审
doi:10.1177/0192623313511336
更新日期:2014-01-01 00:00:00
abstract::Aroclor 1254, at a dose level of 280 micrograms/kg body weight equivalent to 200 micrograms/kg/day, was given 5 days per week to rhesus monkeys over a 27 to 28 month period. Terminal clinical signs of varying severity included fingernail detachment, exuberant nail beds, weight loss, stomatitis and normocytic anemia. A...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1177/019262338601400101
更新日期:1986-01-01 00:00:00
abstract::Determining the carcinogenic potential of materials to which humans have significant exposures is an important, complex, and imperfect exercise. Not only are the methods for such determinations protracted and expensive and use large numbers of animals, extrapolation of data from such studies to human risk is imprecise...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1177/0192623309351892
更新日期:2010-01-01 00:00:00
abstract::Spontaneous neoplasm rates were determined for control Fischer 344 (F344) rats and B6C3F1 mice from 2-yr rodent carcinogenicity studies carried out by the National Toxicology Program (NTP). The most frequently occurring neoplasms in untreated male F344 rats were testicular adenoma (89.1%), mononuclear cell leukemia (5...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1177/019262339802600318
更新日期:1998-05-01 00:00:00
abstract::Selenoprotein P is an abundant extracellular protein that is expressed in liver, brain, and other tissues. Studies in mice with the selenoprotein P gene deleted (Sepp-/- mice) have implicated the protein in maintaining brain selenium. Sepp-/- mice fed a normal or low selenium diet develop severe motor impairment and d...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1080/01926230500243045
更新日期:2005-01-01 00:00:00
abstract::The uterine cellular expression and distribution of c-fos, ERalpha and p38alpha was compared in humans, nonhuman primates, and rats using immunohistochemistry. ERalpha and c-fos were present in the glandular (GE) and luminal epithelial cells (LE) of humans and nonhuman primates, with differing expression patterns evid...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1080/01926230600773941
更新日期:2006-01-01 00:00:00
abstract::The fate of inspired mercury vapour (Hg0) is critical in the central nervous system (CNS) where it can circumvent the blood-brain barrier (BBB) at the neuromuscular junction (NMJ) and accumulate indefinitely in motor neurons by retrograde transport. The detoxification of systemic Hg0 by lung and liver requires investi...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1080/01926230390226069
更新日期:2003-09-01 00:00:00
abstract::At present (putative) human carcinogens are identified via epidemiological studies and testing using the chronic 2-yr rodent bioassay. Both methods have severe limitations in that they are slow, insensitive, expensive, and are also hampered by many uncertainties. The development of methods to modify specific genes in ...
journal_title:Toxicologic pathology
pub_type: 杂志文章,评审
doi:10.1177/019262339802600605
更新日期:1998-11-01 00:00:00
abstract::The lung is a target organ for the toxic effects of several chemical agents, including natural products, industrial chemicals, pesticides, environmental agents, and occasionally, drugs. Factors that establish the lung as a target organ include selective tissue exposure, high tissue oxygenation, and the presence of bio...
journal_title:Toxicologic pathology
pub_type: 杂志文章,评审
doi:10.1177/019262339101900415
更新日期:1991-01-01 00:00:00
abstract::The two-year rodent bioassay is one of several tests that are widely used by governmental regulatory agencies as well as pharmaceutical and chemical companies to determine the carcinogenic potential of chemicals or environmental agents where human exposure is anticipated. That this assay has remained relatively unchan...
journal_title:Toxicologic pathology
pub_type: 杂志文章,评审
doi:10.1080/01926230390201273
更新日期:2003-07-01 00:00:00
abstract::In organs with diverse cell populations, it is not uncommon for one type of cell to respond while others are spared. Even in an organ with common cell types, such as hepatocytes within the liver, the population of cells may respond with different sensitivities for injury or for biochemical responses to toxicants. In t...
journal_title:Toxicologic pathology
pub_type: 杂志文章,评审
doi:10.1080/01926230252824789
更新日期:2002-01-01 00:00:00
abstract::In the present study, susceptibility of CB6F1 mice carrying the human prototype c-Ha-ras gene (rasH2 mice) and p53 gene knockout mice (p53 (+/-) mice) to urethane-induced lung carcinogenesis was compared under the same experimental conditions. Both strains were administered 500 ppm urethane in their drinking water for...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1080/01926230590908231
更新日期:2005-01-01 00:00:00
abstract::2,3-Pentanedione (PD) is a component of artificial butter flavorings. The use of PD is increasing since diacetyl, a major butter flavorant, was associated with bronchiolitis obliterans (BO) in workers and has been removed from many products. Because the toxicity of inhaled PD is unknown, these studies were conducted t...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1177/0192623311431946
更新日期:2012-04-01 00:00:00
abstract::In the present study, beta-catenin localization in hepatocellular neoplasms and hepatoblastomas, induced by oral administration of p-Nitroanisole (pNA) in Crj:BDF1 for 2 years, was evaluated by immunohistochemistry along with genetic alterations in exon 2 of beta-catenin by the polymerase chain reaction-single strand ...
journal_title:Toxicologic pathology
pub_type: 杂志文章
doi:10.1080/01926230600695474
更新日期:2006-01-01 00:00:00