We used quantitative assays to measure the activity of the bone, liver, and intestinal forms of alkaline phosphatase in plasma in 75 patients with endstage chronic renal failure undergoing hemodialysis. The results were correlated with radiological and other biochemical indices of bone disease and with biochemical indices of liver disease. The total activity of alkaline phosphatase in plasma in...

Low luminal acid concentrations stimulate alkaline secretion (AS) by the duodenal mucosa. We investigated acid stimulated alkaline secretion by proximal rabbit duodenal mucosa in an Ussing-chamber under different luminal acid concentrations and its relation to mucosal damage. Luminal alkalinisation and potential difference (PD) were measured and mucosal damage was investigated histologically. L...

Alkaline phosphatase was monitored in 17 mice with s.c.-implanted tumors to relate the total circulating alkaline phosphatase to the total number of tumor cells in each mouse. There was a semilogarithmic relationship between the alkaline phosphatase units and the number of tumor cells. A time-independent standard plot of alkaline phosphatase and the number of tumor cells was used to estimate th...

The isoenzymes of alkaline phosphatase (EC 3.1.3.1) in plasma of 37 preterm and 21 term neonates two weeks postpartum have been studied with regard to electrophoretic mobility, sialic acid content, inhibition properties, heat lability, molecular mass, and binding to lectins. Term infants generally had a single form of alkaline phosphatase present in significant amounts, identified by the above ...

We constructed a derivative of transposon Tn5 that permits the generation of hybrid proteins composed of alkaline phosphatase (EC 3.1.3.1) lacking its signal peptide fused to amino-terminal sequences of other proteins. Such a hybrid gives alkaline phosphatase activity if the protein fused to alkaline phosphatase contributes sequences that promote export and thus compensate for the missing alkal...

The generation of activity-evoked extracellular alkaline shifts has been linked to the presence of external Ca(2+) or Ba(2+). We further investigated this dependence using pH- and Ca(2+)-selective microelectrodes in the CA1 area of juvenile, rat hippocampal slices. In HEPES-buffered media, alkaline transients evoked by pressure ejection of RS-alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic ...

Cyclic AMP content in embryonic chick pelvic cartilage increases significantly as the embryo ages from 8 to 10 d. This in ovo elevation in cyclic AMP content precedes maximal cartilage alkaline phosphatase activity by some 24 h. We studied whether this temporal relationship may be causally related, using an in vitro organ culture. Incubation of pelvic cartilage from 9- and 10-d embryos in mediu...

Salt-alkaline stress generally leads to soil compaction and fertility decline. It also restricts rice growth and phosphorus acquisition. In this pot experiment, two relatively salt-alkaline tolerant (Dongdao-4 and Changbai-9) and sensitive (Changbai-25 and Tongyu-315) rice genotypes were planted in sandy (control) and salt-alkaline soil to evaluate the characteristics of dry matter and phosphor...

Electrophoresis of some serum samples on polyacrylamide gel, followed by staining for alkaline phosphatase (EC 3.1.3.1), produces a band of activity at the gel origin. This high-Mr band consists of liver membrane fragments containing alkaline phosphatase and other enzymes. Alkaline phosphatase is closely associated with phosphatidylinositol in liver plasma membranes, and we have found that phos...

A patient with hypophosphatasia and her relatives, including an affected brother, were studied with regard to serum alkaline phosphatase levels, phosphoethanolamine excretion, leucocyte alkaline phosphatase, blood group genes, and alkaline phosphatase distribution in the serum protein fractions. The pattern of alkaline phosphatase distribution in the serum protein fractions was normal both in t...