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Propylthiouracil is an exogenous organic compound with the formula C7H10N2OS and an average molecular weight of 170.23 g/mol. It exists as a solid at room temperature. Propylthiouracil belongs to the pyrimidines and pyrimidine derivatives, a subclass of diazines within the organic compounds.
This compound is used in the treatment of hyperthyroidism as a thiourea antithyroid agent. It acts as an inhibitor of thyroid peroxidase (TPO), estrogen receptor (ESR1), and type I iodothyronine deiodinase (DIO1). By binding to thyroid peroxidase, propylthiouracil inhibits the conversion of iodide to iodine, a process that normally requires hydrogen peroxide as a cofactor and catalyzes the incorporation of iodide onto the phenol rings of tyrosines in thyroglobulin. Consequently, the compound inhibits the synthesis of thyroxine and the peripheral conversion of thyroxine to tri-iodothyronine, effectively inhibiting the production of new thyroid hormones.
Propylthiouracil is recorded in four sources: antithyroid preparations within healthcare, pharmaceuticals, and veterinary products; household cleaning and consumer products, specifically other smoking requisites and non-electric simulated smoking devices; and the preparation of vinegar within food, food processing, and cookware. The recorded route of exposure for this compound is oral.
Belongs to the class of organic compounds known as pyrimidones. Pyrimidones are compounds that contain a pyrimidine ring, which bears a ketone. Pyrimidine is a 6-membered ring consisting of four carbon atoms and two nitrogen centers at the 1- and 3- ring positions.
Propylthiouracil binds to thyroid peroxidase and thereby inhibits the conversion of iodide to iodine. Thyroid peroxidase normally converts iodide to iodine (via hydrogen peroxide as a cofactor) and also catalyzes the incorporation of the resulting iodide molecule onto both the 3 and/or 5 positions of the phenol rings of tyrosines found in thyroglobulin. Thyroglobulin is degraded to produce thyroxine (3) and tri-iodothyronine (2), which are the main hormones produced by the thyroid gland. Therefore propylthiouracil effectively inhibits the production of new thyroid hormones.
Oral, rat: LD50 = 1250 mg/kg.
Drinking water?Drinking water can be a medium for synthetic chemical contamination, often originating from various industrial processes and agricultural practices.
Antithyroid preparations?Antithyroid preparations are synthetic chemicals used primarily to manage hyperthyroidism by inhibiting the production of thyroid hormones.
Conductors Or Conductive Bodies Characterised By The Conductive Materials?Conductors, or conductive bodies, are materials that allow the flow of electrical current, typically made from metals such as copper, aluminum, or silver.
Electrically Stimulated Smoking Devices?Electrically stimulated smoking devices, commonly known as e-cigarettes or vape pens, utilize electrical components to heat a liquid solution, often containing nicotine, flavorings, and other additives, to produce an aerosol for inhalation.
Electrodes?Electrodes, used in various electrical and electronic applications, can be a source of synthetic chemical contamination due to the materials from which they are constructed and the processes involved in their manufacturing.
Food Preservation?Food preservation often involves the use of synthetic chemicals, such as preservatives, flavor enhancers, and color additives, to extend shelf life and enhance the sensory qualities of food products.
Preparation Of Vinegar?Vinegar is produced through the fermentation of ethanol by acetic acid bacteria, resulting in a solution that typically contains 4-8% acetic acid.
Non Electric Simulated Smoking Devices?Non-electric simulated smoking devices, often designed to mimic the experience of smoking without combustion, can be sources of synthetic chemical contamination due to the materials and chemicals used in their construction and operation.
Other Smoking Requisites?Other smoking requisites, including items such as lighters, matches, and rolling papers, can introduce synthetic chemical contamination through various components and additives.
Perfumes Within Detergents And Soaps?Perfumes within detergents and soaps are synthetic fragrance compounds added to enhance the sensory experience of cleaning products.
Soap Detergents?Soap detergents are synthetic surfactants designed to enhance the cleaning efficacy of water by reducing surface tension, allowing for better interaction with dirt and grease.
Tobacco Smoke Filters?Tobacco smoke filters are designed to reduce the inhalation of harmful substances in cigarette smoke, including tar and other particulate matter.
Manufacture Preparation Of Tobacco Products?The manufacture and preparation of tobacco products involve various processes that can result in the introduction of synthetic chemicals into the environment.
Aftersun Products?Aftersun products are designed to soothe and hydrate the skin after sun exposure, often containing various synthetic chemicals such as emollients, preservatives, and fragrances.
Anti Perspirants Or Body Deoderants?Antiperspirants and body deodorants commonly contain synthetic chemicals such as aluminum compounds, parabens, and synthetic fragrances.
Body Washing Or Cleaning Implements?Body washing or cleaning implements, such as synthetic sponges, loofahs, and washcloths, can be sources of synthetic chemical contamination due to the materials used in their production.
Depilatories?Depilatories are products designed to remove unwanted hair through the application of synthetic chemicals that break down the protein structure of hair, facilitating its removal.
Essential Oils Or Perfumes?Essential oils and perfumes are complex mixtures of volatile compounds derived from natural or synthetic sources, commonly used for their aromatic properties.
Eye Makeup Products?Eye makeup products, including mascaras, eyeliners, and eyeshadows, often contain a variety of synthetic chemicals such as pigments, preservatives, and film-forming agents.
Lip Care Products?Lip care products, including lipsticks, balms, and glosses, often contain a variety of synthetic chemicals such as parabens, phthalates, and synthetic fragrances.
Lip Makeup Products?Lip makeup products, such as lipsticks, lip glosses, and lip liners, often contain a variety of synthetic chemicals, including pigments, preservatives, and emollients.
Manicure Pedicure?Manicure and pedicure procedures often involve the use of various synthetic chemicals, including solvents, nail polishes, and nail adhesives.
Footwear?Footwear production often involves the use of various synthetic chemicals, such as adhesives, dyes, and treatments, which can contribute to environmental contamination.
Yarns Or Threads?Yarns or threads used in textiles can be a source of synthetic chemical contamination due to the production processes and treatments they undergo.
Nitrogenous Fertilisers?Nitrogenous fertilizers are synthetic chemical compounds primarily used to enhance plant growth by supplying essential nitrogen, a crucial nutrient for photosynthesis and protein synthesis.
Nanotechnology?Nanotechnology involves the manipulation of materials at the molecular or atomic level, typically within the range of 1 to 100 nanometers.
Leather Tanning?Leather tanning is a process that transforms raw animal hides into durable leather through the application of various chemicals, including chromium salts, aldehydes, and vegetable tannins.
Water, Wastewater, & Sewage Treatment?Water, wastewater, and sewage treatment processes are critical for managing and mitigating pollutants in water systems.
International Agency for Research on Cancer (2014). IARC Monographs on the Evaluation of Carcinogenic Risks to Humans. - http://monographs.iarc.fr/index.php
Emsley, John (2001). Nature's Building Blocks: An A-Z Guide to the Elements. Oxford: Oxford University Press.
Ellenhorn MJ and Barceloux DG (1988). Diagnosis and treatment of human poisoning. Medical Toxicology. New York, New York: Elsevier Science Publishing Company, Inc.
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