Abstract
The pancreatic stone protein and its secretory form (PSP-S) are inhibitors of CaCO3 crystal growth, possibly involved in the stabilization of pancreatic juice. We have established the structure of PSP-S mRNA and monitored its expression in chronic calcifying pancreatitis (CCP). A cDNA encoding pre-PSP-S has been cloned from a human pancreatic cDNA library. Its nucleotide sequence revealed that it comprised all but the 5' end of PSP-S mRNA, which was obtained by sequencing the first exon of the PSP-S gene. The complete mRNA sequence is 775 nucleotides long, including 5'- and 3'- noncoding regions of 80 and 197 nucleotides, respectively, attached to a poly(A) tail of approximately 125 nucleotides. It encodes a preprotein of 166 amino acids, including a prepeptide of 22 amino acids. No overall sequence homology was found between PSP-S and other pancreatic proteins. Some homology with several serine proteases was observed in the COOH-terminal region, however. The mRNA levels of PSP-S, trypsinogen, chymotrypsinogen, and colipase in CCP and control pancreas were compared. PSP-S mRNA was three times lower in CCP than in control, whereas the others were not altered. It was concluded that PSP-S gene expression is specifically reduced in CCP patients.
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