Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:3.4.21.4 (trypsin)
 42,187 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

We have examined the microscopic appearance, immunohistochemical staining properties, and clinical behavior of 28 cases of acinar cell carcinoma of the pancreas. Two of the tumors occurred in children. The adult patients ranged in age from 40 to 81 years (mean, 62 years). Males greatly outnumbered females, and most of the patients were white. Presenting symptoms were nonspecific, and jaundice was infrequent. The frequently reported complications from increased serum lipase levels (i.e., arthralgias and subcutaneous fat necrosis) were present in only 16% of the patients. Grossly, the tumors were relatively circumscribed and fleshy, averaging 10.8 cm, with occasionally extensive hemorrhage and necrosis. Microscopically, the tumors were very cellular and characteristically lacked a desmoplastic stroma. Acinar, solid, trabecular, and glandular patterns of growth were identified; individual tumors were usually mixed. Nuclei were round to oval, with minimal pleomorphism and single prominent nucleoli. Mitotic activity was variable. In general the cytoplasm was moderately abundant, eosinophilic, and granular, but many of the solid tumors had cells with scanty cytoplasm. Characteristic periodic acid-Schiff-positive, diastase-resistant cytoplasmic granules were demonstrated in greater than 90% of the cases, and the butyrate esterase histochemical stain for lipase activity was positive in 73%. Immunohistochemically, there was positivity for trypsin in 100% of the cases, for lipase in 77%, for chymotrypsin in 38%, and for amylase in 31%. A minor endocrine component was recognized with antibodies against chromogranin or islet cell hormones in 42% of the tumors. Ultrastructurally, exocrine secretory features were present, with polarized cells showing microvillilined lumina, abundant rough endoplasmic reticulum, and 125-1,000-nm zymogen-like granules. In addition, many cases showed pleomorphic electron-dense granules measuring up to 3,500 nm and containing fibrillary internal structures. Follow-up information was available in 88% of the cases. Half of the patients had metastatic disease at presentation and an additional 23% subsequently developed metastases, which were usually restricted to the regional lymph nodes and liver. The mean survival for all cases was 18 months, with 1- and 3-year survivals of 57 and 26%, respectively. Patients presenting before age 60 years survived nearly twice as long as older patients did. Stage also influenced prognosis, whereas the histologic subtype of the tumors and the location within the pancreas correlated only weakly with survival.
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PMID:Acinar cell carcinoma of the pancreas. A clinicopathologic study of 28 cases. 138 74

The effect of pancreas atrophy on myoelectrical activity of the duodenum and serum trypsin, trypsin inhibitor, amylase, lipase activity has been described. The activation of the duodenum motor activity has been established. The changes in the motor activity were connected with trypsin and trypsin inhibitor activity of serum. The motor activity changes were compensated by trypsin therapy.
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PMID:[Hypotrypsinemia as a possible factor in the activation of motor function of the duodenum in pancreatic atrophy in rats]. 138 80

In 35 newborn infants appropriate for gestational age the influence of neonatal polycythemia (venous hematocrit greater than 60% measured between the second and fourth hour of life) on development of enterohepatic circulation of bile acids, activities of pancreatic enzymes in duodenal juice, and the effects of hemodilution were studied during the second week of life. A significant correlation was found between the initial hematocrit and both the bile acid concentration in serum and lipase and trypsin activity in duodenal juice. Of 35 infants, 10 were not treated with hemodilution due to asymptomatic polycythemia; they had the highest concentration of serum bile acids associated with the lowest lipase and trypsin activity in duodenal juice. However, the 25 infants treated with hemodilution also showed serum bile acid concentrations and lipase and trypsin activity in duodenal juice out of the normal range when compared to normocythemic infants. These data indicate that, during the first days of life, polycythemia results in a delayed postnatal development of enterohepatic circulation of bile acids and exocrine pancreas functions independently from the occurrence of clinical symptoms. Thus, it can be concluded that, on the first day of life, all polycythemic infants should be treated with hemodilution. Moreover, the nutritional management of these infants must also account for the limited functional capacity of the gastrointestinal tract.
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PMID:Postnatal development of liver and exocrine pancreas in polycythemic newborn infants. 143 70

Economic function of the exocrine pancreas is based on non-parallel synthesis, transport and secretion of pancreatic enzymes during basal state and postprandially. Reserve capacity of acinar cells is also augmented by adaptation to the diet as well as by regeneration. In mild pancreatic insufficiency complex dietetic considerations help to maintain the necessary secretory capacity of the pancreas. In severe cases effective substitution therapy is mandatory and increasing lipase survival by dietetic maneuvers, by optimizing trypsin and chymotrypsin levels as well as acid and bile secretion can significantly ameliorate results of replacement therapy of steatorrhea. However, in painful chronic pancreatitis high protease activities seem to be beneficial. Individual replacement therapy with pancreatin preparations adapted to the requirements of the patient has to be chosen in difficult cases.
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PMID:[New trends in the treatment of exocrine pancreas deficiency]. 143 12

In order to determine the value of non-invasive tests in the analysis of exocrine pancreatic function in cystic fibrosis, 14 older cystic fibrosis patients were studied by a set of non-invasive tests. The tests comprising trypsin, total amylase, pancreatic isoamylase, lipase and pancreatic polypeptide (PP) in fasting serum, PP in postprandial serum, and p-aminobenzoic acid (PABA) excretion in urine, were compared to faecal fat excretion after discontinuation of pancreatic enzyme supplementation. Eleven of the 14 patients were found to have a faecal fat excretion of more than 7 g per day. Serum levels of trypsin, pancreatic isoamylase and lipase and the urinary excretion of PABA showed significant negative correlations with faecal fat excretion. Although serum trypsin, postprandial PP and urinary PABA excretion were the most sensitive tests for severe exocrine pancreatic insufficiency, the differences in sensitivity were rather modest. Therefore, the type of test to be selected for clinical use is mainly dependent upon factors as accessibility, simplicity, patient's acceptability and costs.
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PMID:Tubeless tests of exocrine pancreatic function in patients with cystic fibrosis. 147 Feb 77

The present study was designed to obtain further information regarding the molecular nature of the corneal receptor(s) facilitating Pseudomonas aeruginosa adhesion to cornea. Scarified adult mouse corneas in organ culture were treated for 10 or 60 min with a panel of lipase-free proteases [each at 20 micrograms ml-1 or 0.22 Units (U) ml-1, activity] including trypsin, chymotrypsin, V8 protease, elastase, subtilisin A, pronase protease and proteinase K. All of these, except proteinase K treatment (20 micrograms ml-1 for 60 min), either significantly elevated or had no effect (proteinase K 20 micrograms ml-1 for 10 min) on subsequent bacterial adhesion at 60 min following topical application of the inoculum to the scarified corneal surface. Enzyme treatment times of 10, 30 or 60 min at a higher concentration (50 micrograms ml-1) of proteinase K, significantly decreased binding at 60 min after bacterial application for each enzyme treatment time. The combined effects of proteases and lipase on bacterial binding also was examined. Eyes treated with proteinase K (20 micrograms ml-1 for 1 hr) or protease-free lipase (50,000 U ml-1 for 1 hr) alone or in combination, all reduced bacterial binding, but the effect was not additive. Trypsin or lipase alone significantly enhanced or decreased binding, respectively. In contrast, trypsin (20 micrograms ml-1 for 1 hr) followed by lipase treatment (50,000 U ml-1 for 1 hr) resulted in binding which was not significantly different than phosphate-buffered saline (PBS) control binding, indicating that the trypsin exposed receptor was lipase sensitive.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Proteinase K decreases Pseudomonas aeruginosa adhesion to wounded cornea. 148 4

Lipoprotein lipase (LPL), hepatic lipase, and pancreatic lipase show high sequence homology to one another. The crystal structure of pancreatic lipase suggests that it contains a trypsin-like Asp-His-Ser catalytic triad at the active center, which is shielded by a disulfide bridge-bounded surface loop that must be repositioned before the substrate can gain access to the catalytic residues. By sequence alignment, the homologous catalytic triad in LPL corresponds to Asp156-His241-Ser132, absolutely conserved residues, and the homologous surface loop to residues 217-238, a poorly conserved region. To verify these assignments, we expressed in vitro wild-type LPL and mutant LPLs having single amino acid mutations involving residue Asp156 (to His, Ser, Asn, Ala, Glu, or Gly), His241 (to Asn, Ala, Arg, Gln, or Trp), or Ser132 (to Gly, Ala, Thu, or Asp) individually. All 15 mutant LPLs were totally devoid of enzyme activity, while wild-type LPL and other mutant LPLs containing substitutions in other positions were fully active. We further replaced the 22-residue LPL loop which shields the catalytic center either partially (replacing 6 of 22 residues) or completely with the corresponding hepatic lipase loop. The partial loop-replacement chimeric LPL was found to be fully active, and the complete loop-replacement mutant had approximately 60% activity, although the primary sequence of the hepatic lipase loop is quite different. In contrast, replacement with the pancreatic lipase loop completely inactivated the enzyme. Our results are consistent with Asp156-His241-Ser132 being the catalytic triad in lipoprotein lipase.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Functional topology of a surface loop shielding the catalytic center in lipoprotein lipase. 151 Sep 14

Qualitative disorders of an echopancreatogram are noted in half of patients with diabetes mellitus (both insulin dependent and noninsulin dependent). The most significant echopancreatographic quantitative and qualitative disorders were observed in diabetic patients with a maximal decrease in pancreatic enzyme excreting activity (on the basis of lipase and trypsin debit in a pancreozymin test, daily steatorrhea and chymotrypsin amount in daily feces). It has been assumed that a degree of ultrasound changes in the pancreas in diabetes depends on a degree of fibrosis of pancreatic exocrine tissue. Ultrasound investigations with quantitative and qualitative assessment of echopancreatograms is a valuable adjuvant diagnostic method in diabetes mellitus.
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PMID:[Echostructure of the pancreas. Comparison with exocrine secretory activity of the pancreas in patients with diabetes mellitus]. 151 83

We compared the circadian patterns of pancreatic and biliary secretions in fasting rats. For this purpose, indwelling plastic catheters were placed in 10 male Wistar rats (300-320 g) for the collection of biliary and pancreatic secretions. After small samples were taken for analysis, pancreatic and biliary secretions were recirculated into the duodenum by an additional connecting system. The rats were adapted to an inverse night-day cycle by artificial light during the night (8 PM-8 AM) and by darkroom housing at daytime (8 AM-8 PM). During a 24-h fasting period, samples of bile (100 microL) and pancreatic juice (20 microL) were taken every hour for determination of the following parameters: pancreatic and biliary flow rate, protein, amylase, lipase, trypsin, and bile acid output. Peak pancreatic flow rate (1.96 +/- 0.05 mL/h.kg) was achieved toward the end of the dark period at 7 PM. A significant increase of pancreatic secretion could be achieved merely by turning the lights off, a significant decrease by turning the lights on. Similar circadian patterns were found for pancreatic protein, amylase, and lipase output with peak secretions at 7 PM. An increase of nearly 5x was found between minimal (15.64 +/- 0.65 mg/h.kg) and maximal (72.43 +/- 2.83 mg/h.kg) pancreatic protein output. The amplitude was highest for amylase; peak amylase output (13740 +/- 832 U/h.kg) was about 18-fold above minimal output (758 +/- 44.3 U/h.kg). Conversely, the peak of trypsin concentration in pancreatic juice (1095 +/- 17.8 U/mL) occurred during the light period when flow rates were lowest.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Nonparallel patterns of circadian pancreatic and biliary secretions in fasting rats. 151 56

Experimental studies have shown that verapamil inhibits pancreatic exocrine secretion. In order to determine whether verapamil has any effect on acute pancreatitis (AP), we undertook an experimental study in Wistar rats. We used 72 animals divided into two groups. In all animals of both experimental groups, AP was induced by ligation of the biliary duct at its entrance in the duodenum. Animals were given saline (NaCl 0.9%), or 0.30 mgrs/hour verapamil. Subgroups of 9 animals, were treated for 6, 12, 18 and 24 hours; 6 animals group were then sacrificed, for biochemical studies (serum amilase, lipase, and calcium; and trypsin and chemotrypsin in the homogenized pancreas); the other 3 animals were used for morphologic study of the pancreas. Verapamil treatment decreased significantly tissue activity of trypsin (p less than 0.001) and chemotrypsin (p less than 0.0001) and increased serum lipase (p less than 0.05), and calcium. There was no statistical difference in serum amylase. Morphological findings include oedema, acinar necrosis, hemorrhage and vasculitis in non treated animals. Only oedema was observed in animals treated with verapamil. These results suggest a beneficial effect of verapamil on experimental AP induced by ligation of the bile duct in the rat.
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PMID:[The effects of verapamil in experimental acute pancreatitis in the rat]. 152 May 48


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