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. 1986 May;77(5):1689–1693. doi: 10.1172/JCI112487

Pyrophosphohydrolase activity and inorganic pyrophosphate content of cultured human skin fibroblasts. Elevated levels in some patients with calcium pyrophosphate dihydrate deposition disease.

L M Ryan, R L Wortmann, B Karas, M P Lynch, D J McCarty
PMCID: PMC424575  PMID: 3009553

Abstract

In calcium pyrophosphate dihydrate (CPPD) crystal deposition disease, metabolic abnormalities favoring extracellular inorganic pyrophosphate (PPi) accumulation have been suspected. Elevations of intracellular PPi in cultured skin fibroblasts from a single French kindred with familial CPPD deposition (19) and elevated nucleoside triphosphate pyrophosphohydrolase activity (NTPPPH), which generates PPi in extracts of CPPD crystal-containing cartilages (14) favor this suspicion. To determine whether NTPPPH activity or PPi content of cells might be a disease marker expressed in extraarticular cells, human skin-derived fibroblasts were obtained from control donors and patients affected with the sporadic and familial varieties of CPPD (CPPD-S and CPPD-F) deposition. Intracellular PPi was elevated in both CPPD-S (P less than 0.05) and CPPD-F (P less than 0.01) fibroblasts compared with control fibroblasts. Ecto-NTPPPH activity was elevated in CPPD-S (P less than 0.01) but not CPPD-F. Intracellular PPi correlated with ecto-NTPPPH (P less than 0.01). Elevated PPi levels in skin fibroblasts may serve as a biochemical marker for patients with familial or sporadic CPPD crystal deposition disease; ecto-NTPPPH activity further separates the sporadic and familial disease types. Expression of these biochemical abnormalities in nonarticular cells implies a generalized metabolic abnormality.

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Selected References

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