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. 1982 Jan;69(1):129–135. doi: 10.1172/JCI110423

Uroporphyrin I Stimulation of Collagen Biosynthesis in Human Skin Fibroblasts

A UNIQUE DARK EFFECT OF PORPHYRIN

George Varigos 1,2,3, John R Schiltz 1,2,3, David R Bickers 1,2,3
PMCID: PMC371176  PMID: 7054234

Abstract

Porphyria cutanea tarda and erythropoietic porphyria are disorders of heme synthesis that originate in the liver and bone marrow, respectively. Each is characterized by increased accumulation of uroporphyrin, I, by cutaneous photosensitivity, and in some patients by indurated plaques and scarring that resemble scleroderma. These scleroderma-like lesions occur in light-exposed and light-protected body areas. In these studies we evaluated the role of uroporphyrin I and of light in evoking the scleroderma-like cutaneous changes. Normal human skin fibroblasts were exposed to uroporphyrin I and to 400 nm radiation and the effect of these agents on collagen accumulation by the cells was determined. Radioactive tracer studies showed that uroporphyrin I caused a specific increase in the accumulation of newly synthesized collagen by fibroblast monolayer cultures, as verified by [3H]hydroxyproline and collagenase digestion assays. Collagen accumulation was stimulated 1.5- to 2.7-fold by uroporphyrin I, whereas noncollagenous protein accumulation was unchanged. The increased collagen accumulation was time and uroporphyrin I-concentration-dependent, and occurred both in the presence or absence of ultraviolet light exposure. Further studies demonstrated that the increased accumulation was not the result of decreased rates of collagen degradation nor was it due to changes in cell population growth parameters (generation times and saturation densities). No changes in morphology of the treated cells occurred. These studies indicate that porphyrins possess previously undemonstrated biological effects that are independent of their photosensitizing properties. This novel dark effect of uroporphyrin I may account for the sclerodermatous lesions seen in the skin of patients with porphyria cutanea tarda and erythropoietic porphyria.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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