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Biomedical subjects

M Wada

Publications and source records attributed to M Wada.

At least 613 records · Page 34Linked to original sources
PubMed1984

Left ventricular function in patients with diabetes mellitus.

The left ventricular function was assessed in 70 diabetics under 60 years of age without clinically evident heart disease using established non-invasive methods, these include systolic time interval method and echocardiography. The ratio of pre-ejection period to left ventricular ejection time (PEP/ET) was remarkably elevated in diabetics with severe microangiopathy (0.431 +/- 0.037). Even in diabetics without microangiopathy PEP/ET ratio was significantly higher (0.374 +/- 0.037) compared with that in controls (0.331 +/- 0.023, P less than 0.01). Most of diabetics with a PEP/ET value of higher than 0.40 were not under proper care with regard to diabetic control. A tendency toward normalization of PEP/ET values was often observed with the improvement in diabetic control during six to twelve months among the inadequately controlled diabetics. Isovolumic relaxation time in diabetics was longer than in controls (80 +/- 14 msec, 59 +/- 11 msec, P less than 0.005). Our results suggest that abnormalities of left ventricular function in diabetics may be related to not only severity of microangiopathy but also the state of diabetic control. The maintenance of adequate control of diabetes seems to play an important role in the prevention of congestive heart failure in patients with diabetes mellitus.

Adolescent↗
PubMed1983

[3H]thymidine autoradiographic and alkaline phosphatase histochemical studies of intestinal metaplasia of the human stomach.

The relationship between cell proliferation and enzyme activity in intestinal metaplasia of the human stomach was studied using a combined method of [3H]thymidine autoradiography and alkaline phosphatase histochemistry on the same section. Three types of intestinal metaplasia were observed depending on variations in both enzymatic activity and isotope labelling. One type shows alkaline phosphatase-positive cells along the entire length of the glands with [3H]thymidine-labelled cells localized only at the bottom of the glands, resembling the duodenum. In another type of intestinal metaplasia, alkaline phosphatase-positive cells are present on the surface and/or upper half of the glands with mitotically active cells occupying the lower part of the glands. The third variety of intestinal metaplasia is characterized by the absence of alkaline-phosphatase activity and [3H]thymidine-labelled cells present in an extended zone in the lower half of the glands. Differences in labelling patterns of [3H]thymidine and the activity of marker enzyme in various types of intestinal metaplasia seem to reflect variations in cell differentiation during intestinalization of gastric mucosa.

Alkaline Phosphatase↗
PubMed1983

Insulin release from BK virus-induced and in vitro maintained insulinoma cells of Syrian golden hamster.

The pancreatic tumor cells (In 111) derived from BK virus-induced insulinoma of Syrian golden hamsters were maintained in culture for several passages and were studied for their insulin secretory ability under various stimulatory conditions. Insulin release was not increased by D-glucose stimulation (27.8 mM), while dibutyryl cyclic AMP (1 mM), theophylline (1 mM), 3-isobutyl-l-methylxanthine (0.1 mM) and elevation of medium calcium from 0.5 to 2.7 mM stimulated insulin release 2.5- to 4-fold. There was a concomitant increase of medium cyclic AMP with addition of theophylline. Streptozotocin (2 mM) treatment for 48 hours significantly reduced insulin release, while alloxan (2 mM), had no inhibitory effect on insulin release. The results indicate that while in vitro-maintained islet tumor cells, In 111, have a cyclic AMP-mediated process involved in insulin secretion analogous to normal beta cells, these cells lack the ability to recognize glucose as an insulin secretagogue probably due to a defect in the cell membrane, though the possibility of alteration in glucose metabolism cannot be fully excluded.

Adenoma, Islet Cell↗
PubMed1983

Effects of acute exercise on insulin binding to erythrocytes in normal men.

Ten normal men were subjected to acute mild and moderate exercise tests, and the insulin binding to erythrocytes was determined before and immediately after exercise and also 10, 30 and 60 minutes after exercise in each test. The insulin binding significantly increased immediately after acute moderate exercise and did not increase immediately after acute mild exercise. In contrast, it decreased below the basal level at 30 and 60 minutes in each test. The changes in insulin receptor binding were due mainly to an alteration in insulin receptor affinity rather than a change in receptor number. These results suggest that isolated erythrocytes may be of some value for study of the effect of physical exercise on the insulin receptor.

Adult↗
PubMed1983

Genetic analysis of a gene regulating the timing of developmental events in Dictyostelium discoideum.

In Dictyostelium discoideum, there exist genes which regulate the timing of developmental events. In one class of these rapidly developing (rde) mutants, the rate of development is accelerated, resulting in the formation of spores and stalk cells in about 2/3 of the time required for the parent. Linkage analysis of one of the rde strains, HTY506, demonstrated that rdeC1850, carried by the mutant is located on linkage group III. Therefore HTY506 differs genetically from the strain FR17, the first rde mutant described which carries a mutation rdeA1 on linkage group IV. While strain HTY506 has a pleiotropic phenotype, the altered characteristics of strain HTY506 appear to be caused by a single mutation, rdeC1850.

Dictyostelium↗
PubMed1983

A study of long-term observations in borderline hypertension.

To identify the risk factors of borderline hypertension in the development of established hypertension, the relationship between the changes in blood pressure over 10 years and the clinical features in the initial year was investigated in a Japanese urban population. The occurrence of cardiovascular complications in cases with borderline hypertension were also studied. The prevalence of borderline hypertension in the initial year was 18.2%. On the basis of the blood pressure changes over 10 years, these subjects could be classified into the following 5 groups: (I) those with developing established hypertension, 19.0%; (II) those with fluctuating between hypertension and borderline hypertension, 27.4%; (III) those with remaining with borderline hypertension, 19.6%; (IV) those with fluctuating between borderline hypertension and normotension, 22.9%; (V) those with improving to normotension, 11.2%. The later development of established hypertension was found in only 2.4% of normotensives in the initial year. Obesity and glucose intolerance were more frequently observed in group I (38.2% and 29.4%, respectively) than in the other groups. Diastolic blood pressures in the initial year were significantly higher in groups I and II than in III, IV and V. As for the occurrence of cardiovascular complications during the observation period, electrocardiographic abnormalities and hypertensive and/or arteriosclerotic retinopathy were not infrequently observed even in borderline hypertensives. Therefore, in subjects with borderline hypertension, continuous medical management, including correction of obesity as well as glucose intolerance, is necessary to prevent the development of established hypertension and subsequent cardiovascular complications.

Adolescent↗