Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:6.3.4.6 (urease)
 7,490 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

In this study, we compared in vitro calcium binding by the taurine and glycine conjugates of the major bile acids in human bile: cholic (CA), chenodeoxycholic (CDCA) and deoxycholic (DCA) acids, together with the cholelitholytic bile acids ursodeoxycholic (UDCA) and ursocholic (UCA) acids. At physiological total calcium (CaTOT) (1-15 mM) and bile acid (BA) (10-50 mM) concentrations, all the bile acids caused concentration-dependent falls in [Ca2+], suggesting calcium binding. Except for glycine-conjugated CDCA, all the other calcium-bile acid complexes were soluble in 150 mM NaCl. The calcium binding affinities followed the pattern: dihydroxy (CDCA, UDCA and DCA) greater than trihydroxy (CA and UCA) bile acids, and glycine conjugates greater than taurine conjugates. The glycine conjugate of UDCA, which increases during UDCA treatment, had the highest calcium binding affinity. Ten-20 mM phospholipid modestly increased calcium binding by CA conjugates, but not by CDCA, UDCA, and DCA conjugates. Phospholipid also prevented the precipitation of glyco-CDCA in the presence of calcium. Bile acid-calcium biding was pH-independent over the range 6.5-8.5. The different calcium binding affinities of the major biliary bile acids may partly explain their varying effects on biliary calcium secretion. The results also suggest that neither precipitation of calcium-bile acid complexes nor impaired calcium binding by bile acids is important in the pathogenesis of human calcium gallstone formation.
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PMID:Calcium binding by bile acids: in vitro studies using a calcium ion electrode. 216 21

Historical review of the pathological investigation on stomach cancer in Japan shows that the central problem had been whether or not gastric cancer developed from chronic peptic ulcer. This theory of ulcer cancer sequence was developed from chronic peptic ulcer. This theory of ulcer cancer sequence was supported by many researchers after the war in the period of 1946-64. Subsequently, systematic studies made at the Cancer Institute revealed that carcinoma arises from the gastric mucosa independently of chronic ulcer. The pathological interest then shifted toward investigation of the histogenesis and biological characteristics of gastric carcinoma. It is concluded that gastric carcinoma can be classified into two types; undifferentiated carcinoma (UCA or gastric type) and differentiated one (DCA or intestinal type). The former arises from the ordinary mucosa and cancer phenotype of this carcinoma resembles to that of the ordinary mucosa, and the latter arises from the metaplastic epithelium of intestinal type showing a cancer phenotype resembling to that of the intestinal metaplastic epithelium. These two carcinomas are also different in biological behaviors, such as growth pattern, invasiveness, metastasis, and prognosis. The frequency of UCA is almost the same in both sexes. DCA, however, occurs more often in male than in female. The time trend data indicates that in both sexes the number of DCA decreased, but that of UCA is steady, so that the ratio of DCA to UCA decreased since 1965. These results combined with the concept of the basic and variable cancer leads to a conclusion that UCA is a basic cancer and DCA is a variable cancer of the stomach.
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PMID:Pathological studies of human gastric cancer. 676 3