Itsuo Suehiro

Acute gastric anisakiasis: 28 cases during the last 10 years.

Anisakiasis is a disease which occurs following eating raw fish infected with anisakis larvae. Many cases have been reported from Japan and from other countries with increasing opportunities of eating raw fish such as “sushi” and “sashimi.” We have reviewed 28 patients with acute gastric anisakiasis during the last 10 years from November 1984 to October 1994. This disease has rarely been detected in persons over 60 years of age and in patients with gastric surgery. Therefore it is postulated that gastric acid secretion influences the activities of anisakis larvae. An alkaline gastric pH could interfere with the toxicity of anisakis larvae.

Effect of synthetic protease inhibitor camostate on pancreatic exocrine function in rats

Pancreatic exocrine function in rats given synthetic protease inhibitor camostate (200 mg/kg body weight) perorally once daily for 10 days was investigated, Pancreatic wet weight was significantly increased in the camostate-treated rats. The increase in pancreatic weight was associated with pronounced hypertrophy and moderate hyperplasia. Total amylase, trypsin, and lipase contents in the pancreas were also increased in the camostate-treated group compared with the control rats. Secretory patterns of pancreatic juice and amylase in response to caerulein were similar in both groups, whereas the dose-response curve for pancreatic juice secretion in the camostate-treated rats was shifted tenfold toward higher concentrations of caerulein. Basal and caerulein-stimulated flow rates of pancreatic juice were significantly greater in the camostate-treated rats than the control rats, although both groups showed a threefold increase over basal secretion in response to maximal stimulation. Amylase outputs in basal state and in response to submaximal doses of caerulein were significantly lower, whereas those to maximal and supramaximal doses were significantly greater in the camostate-treated animals than that in the control rats. These results indicate that treatment with camostate induces pancreatic hypertrophy and hyperplasia, and that the secretory function of the hypertrophied pancreas is quantitatively but not qualitatively altered.

TYPE IIA EARLY GASTRIC CANCER WITH PROLIFERATION OF XANTHOMA CELLS

Abstract: We report a type IIa early gastric cancer associated with xanthoma cell proliferation in a 61-year-old man. The patient was admitted to our hospital because of a gastric polyp detected at a medical checkup. An irregular protruding lesion with xanthoma cell proliferation was detected endoscopically. Histological examination showed a well differentiated tubular adenocarcinoma in the mucosa associated with xanthoma cell proliferation. The distribution of the xanthoma cells in the stroma corresponded closely with that of the cancer cells. Neither atypism nor mitotic figures were recognized in the xanthoma cells. In an immunohistochemical study, almost all the xanthoma cells were stained positive for α1-antitrypsin, while relatively few exhibited positive S-100 protein staining. Specific monocyte chemotactic and activating factor immunoreactivity was present only in the xanthoma cells, and not in the cancer cells. On the basis of these findings, it was speculated that the gastric cancer cells may have caused the xanthoma cell proliferation via an autocrine mechanism i.e., by a chemical mediator acting in a paracrine or juxtacrine manner.

Effect of diabetes mellitus on pancreatic exocrine secretion from isolated perfused pancreas in rats

We studied pancreatic exocrine function in response to cerulein and carbamylcholine in isolated perfused pancreas obtained from control, streptozotocin-induced diabetic, and insulin-treated diabetic rats. The time course of pancreatic juice, protein, amylase, and trypsinogen secretion in response to cerulein or carbamylcholine in diabetic rats was similar to that in control rats. Basal as well as cerulein- or carbamylcholine-stimulated output of amylase from diabetic rat pancreas was significantly reduced, whereas that of trypsinogen was similar to the control. Amylase and trypsinogen outputs in response to 620 pM (1.0 ng/ml) cerulein from insulin-treated diabetic rat pancreas were significantly lower than those from control rat pancreas, although the pancreatic contents of these enzymes were similar to or greater than those in control rats. The dose-response curves of pancreatic juice, protein, amylase, and trypsinogen for cerulein and carbamylcholine were biphasic in both control and diabetic rats. The minimal and the maximal release in response to cerulein occurred with higher concentrations in diabetic rats compared with control rats. In contrast, the maximal responses were obtained with 1 μM carbamyl-choline in control rats and with 0.1–1 μM carbamylcholine in diabetic rats. The present study demonstrates that the concentration of cerulein required to elicit maximal response was increased, whereas that to carbamylcholine was reduced in diabetic rat pancreas, and that the protein and enzyme outputs in response to cerulein were significantly reduced in insulin-treated diabetic rat pancreas despite restoration of the pancreatic enzyme contents to control levels.

Dual effects of hydrocortisone on exocrine rat pancreas

The acute and chronic effects of hydrocortisone on exocrine pancreatic function were examined in the isolated perfused rat pancreas. In the first part of this study, rats were given subcutaneous injections of hydrocortisone at doses of 1.25, 2.5, 5, and 10 mg/kg body wt once daily for 7 days. Trypsin and lipase secretion in response to 100 pM cholecystokinin-octapeptide was significantly increased in rats with the two highest doses of hydrocortisone compared with controls, irrespective of whether calculated as the total amount of stimulated output of enzymes or related to the secretion of enzyme to the pancreas content. On the other hand, the secretory responsiveness of amylase to 100 pM cholecystokinin-octapeptide was maximal at the 5-mg dose, and decreased with higher doses. In the second part, 100 microM hydrocortisone was superimposed for 20 min on 100 pM cholecystokinin-octapeptide stimulation to examine the acute effects of hydrocortisone on exocrine pancreatic function in the isolated perfused rat pancreas. Addition of hydrocortisone caused a significant inhibition of the secretion of pancreatic juice and amylase. The present study has clearly demonstrated the dual effects of glucocorticoids on the pancreas: inhibition and potentiation. There is a possibility that chronic treatment with large doses of glucocorticoid may sensitize the acinar cells an induce hypersecretion of trypsin and lipase, whereas acute treatment inhibits secretory function of exocrine pancreas.

Serum pancreatic secretory trypsin inhibitor in pancreatic disease

The clinical usefulness of serum pancreatic secretory trypsin inhibitor (PSTI) in pancreatic diseases was evaluated. The mean serum PSTI level of 41 healthy normal persons was 9.4 ng/ml (ranging from 5.2 to 16.7 ng/ml). Serum PSTI levels were abnormally raised in all patients with acute pancreatitis ranging from 35.0 to 4500 ng/ml, but were almost within normal range in patients with chronic pancreatitis, pancreatic cyst, acute abdominal emergencies such as perforated ulcer and intestinal obstruction, and macroamylasemia. There was no correlation between serum PSTI levels and total or pancreatic-type isoamylase activity. Patients with acute pancreatitis in whom the elevation of serum PSTI was transient and occurred after that of serum amylase activity had relatively mild symptoms and recovered along with normalization of serum PSTI levels. On the other hand, patients whose serum PSTI values became increased coincidentally with serum amylase activity and remained elevated, had severe clinical symptoms and unfavorable clinical outcome. Of 2 patients who underwent partial pancreatectomy, the serum PSTI level increased markedly in one who developed postoperative pancreatitis but not in the other without pancreatitis. In contrast to patients with acute pancreatitis, the serum response to the secretin stimulation in patients with chronic pancreatitis, was only small and transient, reaching the maximum at 10 min after administration of secretin. These results suggest that measurement of serum PSTI concentration may be useful in the diagnosis of acute pancreatitis and that the degree of rise and the duration of the elevated levels of serum PSTI are closely related to the severity of acute pancreatitis.

Effect of α-glucosidase inhibitor on exocrine and endocrine pancreatic function in rats fed a high-carbohydrate diet consisting of sucrose or glucose

The effect of the alpha-glucosidase inhibitor acarbose on pancreatic exocrine and endocrine function was studied using the isolated perfused pancreata prepared from rats fed a normal (control diet) or an acarbose-containing sucrose- (ACS diet) or glucose-supplemented diet (ACG diet) for 10 days. Pancreatic amylase and insulin contents in rats fed the ACS diet were significantly decreased compared with those in rats with the control diet. Rats fed the ACG diet, however, had normal enzyme and hormone contents. Basal and cerulein-stimulated flow rates of pancreatic juice in rats with the ACS or ACG diet were similar to those in rats fed the control diet, suggesting that the pancreata from rats treated with acarbose have normal sensitivity and responsiveness to cerulein. On the other hand, cerulein-stimulated amylase output was significantly decreased in rats with the ACS diet, but was normal in rats with the ACG diet. Insulin secretion to both glucose and cerulein stimulation in rats fed the ACS diet was reduced by approximately 55% compared with the control rats. On the other hand, rats fed the ACG diet showed normal insulin secretion to glucose stimulation, although the insulin response to cerulein stimulation was reduced by 30%. These results suggest that the addition of acarbose to the sucrose-rich diet decreases the secretory responsiveness of amylase to cerulein stimulation and that of insulin to both glucose and cerulein stimulation. All these alterations, except the sensitivity of B cells to cerulein, can be normalized by replacing sucrose with glucose.

Effect of acarbose on exocrine and endocrine pancreatic function in the rat

SummaryExocrine and endocrine pancreatic function were studied simultaneously in the isolated perfused pancreas from rats fed a normal or an acarbose-containing diet (150 mg/ 100 g food) for 20 days. Body weight gain of acarbose-treated rats was slightly lower than that of control rats, despite a larger food intake. Basal and caerulein-stimulated flow rates of pancreatic juice from acarbose-treated rat pancreases were similar to those from controls, suggesting that the treated rat pancreas has normal sensitivity and responsiveness to caerulein. On the other hand, amylase output in response to caerulein was significantly decreased in acarbose-treated rat pancreases, though basal output was normal. The addition of acarbose to the diet for 20 days had no effect on the speed of the insulin response to glucose and caerulein, but the magnitude of insulin secretion to glucose stimulation was reduced by 40% and the caerulein-induced additional output of insulin by 30% in the treated group as compared with the control group. The present investigation has demonstrated that inhibition of key enzymes for carbohydrate digestion decreases not only the secretory responsiveness of amylase from acinar cells to caerulein stimulation but also the sensitivity of the insulin-secretory mechanism of pancreatic B cells to glucose and non-glucose stimulation.

Effects of hydrocortisone on glucose- and cholecystokinin-induced insulin release from the isolated perfused rat pancreas.

The acute and chronic effects of hydrocortisone on insulin secretion were examined in the isolated perfused rat pancreas. In the first part of this study, the chronic effects of hydrocortisone on insulin release were examined using isolated perfused pancreas prepared from rats that had been given subcutaneous injections of hydrocortisone at doses of 1.25, 2.5, 5.0, and 10.0 mgkg body weight once daily for 7 days. Hydrocortisone treatment led to a dose-dependent increase in insulin secretion in response to 8.3 mM glucose. The insulin response to 100 pM cholecystokinin (CCK-8) was also significantly higher in the hydrocortisone-treated rats than in the control group. However, the increment of insulin level over the value before CCK-8 addition in rats treated with hydrocortisone was not significantly different from that in the control rats. In the second part, the acute effects of hydrocortisone on insulin release were studied. Hydrocortisone (1 7-hydroxycorticosterone) at a concentration of 100 μM caused significant inhibition of the stimulatory effect of CCK-8 on insulin secretion. The inhibition started within 1 min of the beginning of hydrocortisone administration and ceased immediately after the termination of its infusion. We have demonstrated in this study a dual effect of hydrocortisone on insulin release: first, the potentiation of the insulin secretion stimulated by glucose but not by CCK-8 and, second, the inhibition of CCK- %stimulated insulin secretion.

Amylase inhibitor from wheat: Its action and clinical application

SummaryThe electrophoretic and column Chromatographic characteristics of an amylase inhibitor of wheat origin were investigated. Further, the clinical usefulness of this inhibitor for determining the ratio of pancreatic to salivary isoamylase activity in serum was evaluated. Amylase inhibitor inhibits the action of salivary α-amylase by making an amylase-inhibitor complex, which is easily separated into its individual component during electroresis with full recovery of amylase activity. Using the specific inhibitory effect of this inhibitor on salivary α- amylase activity, the ratio of pancreatic to salivary isoamylase activity (P/S) in serum was determined. There was a good correlation in P/S ratio in serum between the results obtained with the inhibitor method and those with electrophoretic method. The P/S ratio in sera from patients with acute pancreatitis was over 8.0, whereas that in sera from patients with salivary-type hyperamylasemia such as mumps, pulmonary diseases and following surgery was less than 0.1. However, hyperamylasemia due to macroamylase or renal failure could not be identified by the inhibitor method.