What is the pathogenesis of pseudogout?

Updated: Jan 26, 2021
  • Author: Bruce M Rothschild, MD; Chief Editor: Herbert S Diamond, MD  more...
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The CPP crystals that produce pseudogout comprise a combination of inorganic pyrophosphate and calcium. The inorganic pyrophosphate is produced in large part by ectonucleotide phosphodiesterase pyrophosphatase (ENPP1), a catalytic enzyme found in chondrocytes of cartilage, and the pyrophosphate is exported potently by the membrane transporter ANKH.

A genetic predisposition exists for pseudogout. However, aging, some metabolic diseases (eg, hyperparathyroidism, hemochromatosis, and hypomagnesemia), and any process that leads to osteoarthritis also can be associated with subsequent CPP crystal deposition and pseudogout.

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