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pubmed:abstractText |
It is recognized that serum alkaline phosphatase may reflect enzyme contributions from bone, liver, and intestine. We have investigated serum alkaline phosphatases in two siblings with hypophosphatasia. After administration of long-chain triglycerides, the major alkaline phosphatase component of their sera was shown to be of intestinal origin on the basis of inhibition by l-phenylalanine. Starch block electrophoresis suggested that there were other regions of l-phenylalanine-sensitive alkaline phosphatase in addition to the major slow-moving intestinal band. Medium-chain triglycerides which are absorbed by the portal route did not cause a similar augmentation of intestinal alkaline phosphatase activity. These studies indicate that serum levels of intestinal alkaline phosphatase are increased normally after long-chain fat feeding in hypophosphatasia and may be the major component of total serum alkaline phosphatase activity.
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