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Processing-independent analysis (PIA)--a new diagnostic tool.

Posttranslational processing is an important phase of the expression of most eucaryotic genes in terms of functional proteins. Among these, secretory proteins and peptides are of particular interest for clinical chemists, since diagnostic measurements of circulating proteins and peptides constitute a major discipline in clinical chemistry. The posttranslational covalent maturation of secretory proteins and peptides involves multiple enzymatic modifications of the corresponding proproteins along the intracellular secretory pathway. During the eighties, an increasing amount of evidence has indicated that sick secretory cells fail to process their secretory products normally. The diseased cells therefore fail to process their secretory products normally. The diseased cells therefore release also incompletely processed precursors and processing-intermediates. In order to measure the degree of disease, assays that measure proteins and peptides independent of the degree of processing are therefore desirable. We have now designed a new analytical principle, according to which secretory proteins, peptides and their precursors can be accurately quantitated irrespective of the degree of processing. This principle, named processing-independent analysis (PIA), is generally applicable to all cellular synthesized substances. The principle has been applied to and developed first for a well-defined secretory peptide system, progastrin and its products. Using this model, the results obtained so far confirm the diagnostic superiority of processing-independent analysis in comparison with conventional assays for bioactive peptides.