Abstract

Antisecretory factor (AF) is a protein complex which inhibits inflammation and regulates fluid transport. In this article, two new immunoassays (ELISA) are developed. The first ELISA establishes a 26S proteasome concentration of 0.41±0.03 μg/mL in normal plasma; the second ELISA discloses the binding of proteasomes to complement factor C3. The latter test values increased about tenfold following intake of processed cereals, paralleling with the old AF ELISA. The proteasome/C3 complex is purified and shown to expose hidden antisecretory peptide sequence and contain the inactive C3c protein. These findings might explain the antisecretory and anti-inflammatory effect during AF complex formation.

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