Protoporphyrin IX


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Protoporphyrin IX

Protoporphyrin IX is a protein. The measurement of this protein is useful for the assessment of iron status. Hemoglobin consists of a complex of a protein plus heme. Heme consists of iron plus protoporphyrin IX. Normally, during the course of red blood cell formation, protoporphyrin IX acquires iron, to generate heme, and the heme becomes incorporated into hemoglobin. However, in iron deficiency, protophoryrin IX builds up.
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A separate study of 12 healthy adults found that pretreatment with an ablative fractional laser significantly intensifies protoporphyrin IX fluorescence to a larger extent than curettage, microdermabrasion, microneedling, and nonablative fractional laser (JAMA Derm.
Some genetic pathways leading to build-up of protoporphyrin IX have already been described, but many cases of EPP remain unexplained.
Further researches on the characteristics of chlorophyll metabolism indicated that the precursors of D-aminolevulinic acid (ALA), porphobilinogen (PBG), uroporphyrinogen III (Urogen III), coproporphyrinogen III (Coprogen III), protoporphyrin IX (Proto IX), Mg-protoporphyrin IX (Mg-Proto IX) and protochlorophyllide (Pchlide) in chlorophyll biosynthesis in Burley21 were lower than in Maryland609 at vigorous growing period; the activity of D-aminolevulinate dehydratase (ALAD) in Burley21 was 0.
However, when cells are exposed to excess exogenous 5-ALA as a drug, the negative feedback control mechanism of 5-ALA synthesis is bypassed, leading to protoporphyrin IX accumulation in the mitochondria of malignant tissues where ferrochelatase enzyme is absent.
The active substance in GLIOLAN, aminolevulinic acid (ALA), is a photoreceptive compound which is absorbed by cells in the body, where it is converted by enzymes into fluorescent chemicals, particularly protoporphyrin IX (PPIX).
1) Ferrochelatase activity in patients with EPP is typically 10% to 25% of normal, resulting in an accumulation of protoporphyrin IX in the skin, erythrocytes, liver, and plasma.
N-alkylporphyrins distort or bend protoporphyrin IX, inhibiting the production of heme (as in hemoglobin).
Kennedy JC, Pottier RH: Endogenous protoporphyrin IX, a clinically useful photosensitizer for photodynamic therapy.
The condition is caused by a deficiency of ferrochelatase, which leads to accumulation of protoporphyrin IX.
Measurements of transferrin receptor and erythrocyte zinc protoporphyrin IX (ZnPPIX) concentrations have been suggested as screening tools to detect iron deficiency (1,2).
One of the earliest features of griseofulvin exposure is a hepatic porphyria characterized by the accumulation of protoporphyrin IX (De Matteis and Rimington 1963; Weston Hurst and Paget 1963).
The structure of a naturally occurring porphyrin, Protoporphyrin IX, is shown in Fig.