uroporphyrin

uroporphyrin
1. Porphyrin excreted in the urine in porphyrinuria; e.g., urobilin. 2. Class name for all porphyrins containing 4 acetic acid groups and 4 propionic acid groups in positions 1 through 8. SEE ALSO: porphyrinogens.
- u. I porphin-1,3,5,7-tetraacetic acid-2,4,6,8-tetrapropionic acid; formed by the action of light on uroporphyrinogen I; elevated levels observed in certain porphyrias.
- u. III porphin-1,3,5,8-tetraacetic acid-2,4,6,7-tetrapropionic acid; formed by the action of light on uroporphyrinogen III; elevated levels observed in certain porphyrias.

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uro·por·phy·rin .yu̇r-ō-'pȯr-fə-rən n any of four isomeric porphyrins C40H38N4O16 which contain acetic acid and propionic acid groups on the porphin nucleus and are closely related to the coproporphyrins

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n.
a porphyrin that plays an intermediate role in the synthesis of protoporphyrin IX. It is excreted in significant amounts in the urine in porphyria.

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uro·por·phy·rin (u″ro-porґfə-rin) the porphyrin (q.v.) produced by oxidation of the methylene bridges in uroporphyrinogen. Excessive amounts of uroporphyrin I are excreted in congenital erythropoietic porphyria, and both types I and III are excreted in porphyria cutanea tarda. See uroporphyrinogen.

Medical dictionary. 2011.

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  • Uroporphyrin — U|ro|por|phy|rin [↑ ur (1)]: ↑ Porphyrin. * * * Uro|porphyrin   das, s, Zwischenprodukt der Porphyrinbiosynthese; im Organismus in pathologischen Fällen (Porphyrie) vermehrt in Harn und Kot …   Universal-Lexikon

  • uroporphyrin — uro·por·phy·rin …   English syllables

  • uroporphyrin — n. a porphyrin that plays an intermediate role in the synthesis of protoporphyrin IX. It is excreted in significant amounts in the urine in porphyria …   The new mediacal dictionary

  • uroporphyrin — |yu̇rō+ noun Etymology: International Scientific Vocabulary ur (I) + porphyrin : any of four isomeric porphyrins C20H6N4(CH2COOH)4(CH2CH2COOH)4 which contain acetic acid and propionic acid groups on the porphin nucleus and are closely related to… …   Useful english dictionary

  • Уропорфирин (Uroporphyrin) — порфирин, играющий промежуточную роль в процессе синтеза протопорфирина IX. При порфирии уропорфирин в значительном количестве выводится из организма с мочой. Источник: Медицинский словарь …   Медицинские термины

  • УРОПОРФИРИН — (uroporphyrin) порфирин, играющий промежуточную роль в процессе синтеза протопорфирина IX. При порфирии уропорфирин в значительном количестве выводится из организма с мочой …   Толковый словарь по медицине

  • Porphyria — Any of a group of inherited diseases characterized by skin sensitivity to sunlight and/or by intermittent acute attacks of abdominal and nerve pain. The porphyrias are caused by enzyme defects that trigger the overproduction of porphyrins by the… …   Medical dictionary

  • Porphyria cutanea tarda — Literally, the late skin form of porphyria, a genetic photosensitive (light sensitive) skin disease with onset in adult life with substances called uroporphyrins in the urine due to a deficiency of uroporphyrinogen decarboxylase (UROD), an enzyme …   Medical dictionary

  • uroporphyrinogen — See porphyrinogens. u. decarboxylase an enzyme that participates in heme biosynthesis; it catalyzes the decarboxylation of uroporphyrin III to produce coproporphyrinogen III; it also acts on uroporphyrin I; a deficiency of this …   Medical dictionary

  • Turacin — is a red, naturally occurring pigment that is 6% copper complexed to uroporphyrin 111. It is found only in the turaco group of birds as the red in their plumage. [ [http://cancerweb.ncl.ac.uk/cgi bin/omd?turacin Online Medical Dictionary] ] It is …   Wikipedia

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