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Guinea Pig Maximisation Test
The Guinea pig maximisation test (GPMT) is an ''in vivo'' test to screen for substances that cause human skin sensitisation (i.e. allergens). It was first proposed by B. Magnusson and Albert Kligman in 1969 and described in their 1970 book ''Allergic Contact Dermatitis in the Guinea Pig''. The test is composed of two phases, the induction phase and the challenge phase. The induction phase includes exposing a test group of animals twice to the test material, first by intradermal injection followed by topical application seven days later. During Induction A, the test animals are exposed intradermally to the test material, along with an adjuvant to enhance the immune reaction of the guinea pig. During Induction B, the topical induction, the test group is exposed to the test article for 48 hours, occluded. The guinea pigs are then a short while later exposed to a lower concentration of the test material, and their allergic reaction, if any, measured. 15% of guinea pigs must show a rea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
In Vivo
Studies that are ''in vivo'' (Latin for "within the living"; often not italicized in English) are those in which the effects of various biological entities are tested on whole, living organisms or cells, usually animals, including humans, and plants, as opposed to a tissue extract or dead organism. This is not to be confused with experiments done ''in vitro'' ("within the glass"), i.e., in a laboratory environment using test tubes, Petri dishes, etc. Examples of investigations ''in vivo'' include: the pathogenesis of disease by comparing the effects of bacterial infection with the effects of purified bacterial toxins; the development of non-antibiotics, antiviral drugs, and new drugs generally; and new surgical procedures. Consequently, animal testing and clinical trials are major elements of ''in vivo'' research. ''In vivo'' testing is often employed over ''in vitro'' because it is better suited for observing the overall effects of an experiment on a living subject. In dr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skin Sensitisation
Skin is the layer of usually soft, flexible outer tissue covering the body of a vertebrate animal, with three main functions: protection, regulation, and sensation. Other animal coverings, such as the arthropod exoskeleton, have different developmental origin, structure and chemical composition. The adjective cutaneous means "of the skin" (from Latin ''cutis'' 'skin'). In mammals, the skin is an organ of the integumentary system made up of multiple layers of ectodermal tissue and guards the underlying muscles, bones, ligaments, and internal organs. Skin of a different nature exists in amphibians, reptiles, and birds. Skin (including cutaneous and subcutaneous tissues) plays crucial roles in formation, structure, and function of extraskeletal apparatus such as horns of bovids (e.g., cattle) and rhinos, cervids' antlers, giraffids' ossicones, armadillos' osteoderm, and os penis/os clitoris. All mammals have some hair on their skin, even marine mammals like whales, dolphin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Allergens
An allergen is a type of antigen that produces an abnormally vigorous immune response in which the immune system fights off a perceived threat that would otherwise be harmless to the body. Such reactions are called allergies. In technical terms, an allergen is an antigen that is capable of stimulating a type-I hypersensitivity reaction in atopic individuals through immunoglobulin E (IgE) responses. Most humans mount significant Immunoglobulin E responses only as a defense against parasitic infections. However, some individuals may respond to many common environmental antigens. This hereditary predisposition is called atopy. In atopic individuals, non-parasitic antigens stimulate inappropriate IgE production, leading to type I hypersensitivity. Sensitivities vary widely from one person (or from one animal) to another. A very broad range of substances can be allergens to sensitive individuals. Types of allergens Allergens can be found in a variety of sources, such as d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albert Kligman
Albert Montgomery Kligman (March 17, 1916 – February 9, 2010) was an American dermatologist who co-invented Retin-A, the acne medication, with James Fulton (dermatologist), James Fulton in 1969. Kligman performed human experiments on inmates at Holmesburg Prison in Philadelphia. Scandal followed years later. The experiments intentionally exposed humans to pathogens and the chemical warfare agent Dioxins and dioxin-like compounds, dioxin, and later became a wikt:textbook example, textbook example of unethical experimenting on humans. He and others involved were sued for alleged injuries, but the lawsuit was dismissed due to the statute of limitations expiring. Biography Albert Montgomery Kligman was born in Philadelphia on March 17, 1916, the son of Jewish immigrants. His father, born in Ukraine, was a newspaper distributor; his mother, born in England, was a sales clerk. As a child, he was a Boy Scout, developing a love of plants on scouting trips to the countryside. With financ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of Investigative Dermatology
The ''Journal of Investigative Dermatology'' is a peer-reviewed medical journal covering dermatology. It has been published by Elsevier since 2016 and the editor-in-chief is Mark C. Udey (Washington University School of Medicine). Abstracting and indexing The journal is abstracted and indexed in: According to the ''Journal Citation Reports'', the journal has a 2020 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as ... of 8.551. References External links * {{Authority control Dermatology journals Publications established in 1938 Elsevier academic journals Monthly journals English-language journals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adjuvant
In pharmacology, an adjuvant is a drug or other substance, or a combination of substances, that is used to increase the efficacy or potency of certain drugs. Specifically, the term can refer to: * Adjuvant therapy Adjuvant therapy, also known as adjunct therapy, adjuvant care, or augmentation therapy, is a therapy that is given in addition to the primary or initial therapy to maximize its effectiveness. The surgeries and complex treatment regimens used i ... in cancer management * Analgesic adjuvant in pain management * Immunologic adjuvant in vaccines This is a specialized usage of a word (derived from the Latin verb "adjuvare", ''to help''), which also has a more general meaning as someone or something assisting in any operation or effect. {{sia Adjuvants ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
False Negative
A false positive is an error in binary classification in which a test result incorrectly indicates the presence of a condition (such as a disease when the disease is not present), while a false negative is the opposite error, where the test result incorrectly indicates the absence of a condition when it is actually present. These are the two kinds of errors in a binary test, in contrast to the two kinds of correct result (a and a ). They are also known in medicine as a false positive (or false negative) diagnosis, and in statistical classification as a false positive (or false negative) error. In statistical hypothesis testing the analogous concepts are known as type I and type II errors, where a positive result corresponds to rejecting the null hypothesis, and a negative result corresponds to not rejecting the null hypothesis. The terms are often used interchangeably, but there are differences in detail and interpretation due to the differences between medical testing and statis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OECD Guidelines For The Testing Of Chemicals
OECD Guidelines for the Testing of Chemicals (OECD TG) are a set of internationally accepted specifications for the testing of chemicals decided on by the Organisation for Economic Co-operation and Development (OECD). They were first published in 1981. They are split into five sections: * Section 1: Physical Chemical Properties * Section 2: Effects on Biotic Systems * Section 3: Environmental Fate and Behaviour * Section 4: Health Effects * Section 5: Other Test Guidelines Guidelines are numbered with three digit numbers, the section number being the first number. Sometimes guidelines are suffixed with a letter. Guidelines are under constant review, with guidelines being periodically updated, new guidelines being adopted, and guidelines being withdrawn. Previous guidelines are maintained on the website for reference purposes. Animal welfare concerns are dealt with by ensuring that animal tests are only permitted where necessary. The guidelines are available in both English ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Local Lymph Node Assay
The murine local lymph node assay (LLNA) is an ''in vivo'' test for skin sensitisation. LLNA has largely superseded the guinea pig maximisation test and the Buehler test. It is considered more scientific and less cruel (lower number of animals; less suffering) and has found broad scientific and regulatory acceptance. The principle underlying the LLNA is that skin sensitizers induce growth of lymphocytes in the lymph nodes draining the site of application. Lymphocyte cell proliferation, proliferation can be measured by radiolabeling (quantifying tritiaded thymidine), bioluminescence (quantifying Adenosine triphosphate, ATP content in lymphocytes) or immunoassay (ELISA utilizing an antibody specific for BrdU). The test material is applied to the ears of mice. Optionally, a tracer substance such as 3H-Methyl-thymidine or BrdU is injected intraperitoneally for lymphocyte incorporation. The animals are euthanized and their lymph node cells are removed and analyzed. The ratio of tracer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Food And Chemical Toxicology
''Food and Chemical Toxicology'' is a peer-reviewed scientific journal covering aspects of food safety, chemical safety, and other aspects of consumer product safety. It is published by Elsevier and was established in 1963. The editor-in-chief is José L. Domingo. Abstracting and indexing The journal is abstracted and indexed in Analytical Abstracts, BIOSIS Previews, CAB International, Chemical Abstracts Service, Current Contents/Agriculture, Biology & Environmental Sciences, Current Contents/Life Sciences, Elsevier BIOBASE, EMBASE, MEDLINE/PubMed, Science Citation Index, and Scopus. According to the ''Journal Citation Reports'', it has a 2014 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as ... of 2.895, ranking it 30th out of 87 journals in the category "Toxicolog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
