Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0016632 (Fox)
 1,461 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Uroporphyrin I is found in high concentration in the bones, teeth, blood, soft tissues, and urine of the fox squirrel, Sciurus niger. The concentration of uroporphyrin in fox squirrel spleen is much higher than in liver, kidney or bone marrow, probably because of accumulation from phagocytosed red cells. Bleeding causes a marked increase in the uroporphyrin concentration of red cells and spleen, and a 3-8-fold increase in uroporphyrin excretion. Urinary excretion of delta-aminolevulinic acid and porphobilinogen is not greater in fox squirrels than in nonporphyric gray squirrels. Sciurus carolinensis, used as controls. In all these characteristics, as well as in the previously demonstrated deficiency of the enzyme uroporphyrinogen III cosynthetase in red cells, the physiological porphyria of fox squirrels resembles congenital erythropoietic porphyria, a hereditary disease of man and cattle. For squirrels differ in showing no evidence of cutaneous photosensitivity or hemolytic anemia. Uroporphyrinogen III cosynthetase activity is present in fox squirrel bone marrow at 1/10 its concentration in gray squirrel marrow. The fox squirrel enzyme is much more unstable than the gray squirrel enzyme, which provides a possible explanation for its low activity and for the overproduction of uroporphyrin I. It is unlikely that the deficiency of cosynthetase is due to its inactivation by excessive amounts of uroporphyrinogen I synthetase, because activity of the latter enzyme is the same in blood from fox and gray squirrels.Fox squirrel porphyria provides a convenient model for studies of pathogenesis of human congenital erythropoietic porphyria.
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PMID:Erythropoietic porphyria of the fox squirrel Sciurus niger. 468 90

Melasma, moniliasis, photosensitivity, alopecia, and bullous eruptions are the most frequently reported dermatological side-effects of oral contraceptives. Other conditions reported occasionally as resulting from or being aggravated by these drugs have been acne, hidradenitis suppurativa, seborrhea, and Fox-Fordyce disease. Very rarely erythema nodosum, purpura, lupus erythematosus, increase in number of moles, and hypertrophic gingivitis have been associated. Melasma occurs within months or after a year in most cases, and may pass off gradually after stopping the drug. A malnutrition factor has been suggested and vitamin-B used as therapy. Photosensitivity may be a factor in melasma or occur independently. A period of months is required for the development of moniliasis. Family planning centers with their large numbers of patients should be a help in solving these problems but other specialists are needed also.
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PMID:Oral contraceptive and dermatology. 1230 10