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Endoproteases in the secretory pathway process pro-cholecystokinin (CCK) into the biologically active forms found in the tissues that express CCK mRNA. Thus far, the endoproteases involved in CCK processing include cathepsin L and the prohormone convertases (PC) 1, 2, and 5. This study finds that PC7 is also critical for normal production of CCK in specific areas of the brain. Loss of PC7 results...
Two different RNAi methods were used to inhibit the expression of prohormone convertase 1 (PC1) in At-T20 cells. Transient transfection of double stranded RNA and stable expression of a vector expressing hairpin-loop RNA targeting PC1 reduced cholecystokinin (CCK) secretion from At-T20 cells. PC1 mRNA and protein were also decreased in the vector transfected cells. This treatment caused a shift in...
Cholecystokinin (CCK) is produced from pro CCK by a series of enzymatic cleavages. One of the enzymes thought to be important for pro CCK cleavage is prohormone convertase 5 (PC5). STC-1 cells, a mouse intestinal tumor cell line that expresses CCK, PC1, PC2, and PC5 were stably transfected with hairpin loop plasmids encoding siRNA targeting PC5 and clones were selected. CCK secretion was reduced significantly...
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