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T Ogihara

Publications and source records attributed to T Ogihara.

At least 685 records · Page 38Linked to original sources
PubMed1990

Expression of histocompatibility antigen HLA-DR on the epithelial cells of the pancreatic duct and thyroid follicle. An autopsy case.

An autopsy case of chronic pancreatitis associated with unusual chronic thyroiditis in a 54-year-old woman is presented. Microscopically, the pancreas was densely infiltrated by lymphocytes and its exocrine parenchyma was completely replaced by sclerotic tissue. The thyroid gland was also infiltrated by lymphocytes, but no lymphoid follicles were observed. These morphological changes are rare findings with respect to the severity of inflammation and the association of the affected organs. Further findings suggested involvement of an autoimmune mechanism in the pathogenesis of these lesions. Using the avidin-biotin-conjugate technique and antibodies (Abs) against T lymphocyte and HLA-DR antigens (Ags), immunological aspects of the lesions were studied. Most of these infiltrating lymphocytes were revealed to be T lymphocytes, and HLA-DR Ags were observed on the epithelial cells of the pancreatic ducts and thyroid follicles. As a control, 45 surgical specimens of pancreas and thyroid gland were studied for detection of HLA-DR expression on the epithelial cells. One case of chronic pancreatitis was revealed to express HLA-DR Ag on the epithelium. The patient was a 44-year-old woman who had silently developed pancreatic cyst due to chronic inflammation. This finding also suggests a role of autoimmunity in the pathogenesis of chronic idiopathic pancreatitis.

Autopsy↗
PubMed1990

Absence of nocturnal fall in blood pressure in elderly persons with Alzheimer-type dementia.

Circadian changes of the blood pressure and heart rate in elderly normotensive bedridden patients with severe dementia of the Alzheimer type (group D) were compared with those in elderly normotensive bedridden patients without dementia (group R), normotensive subjects with normal daily activity (group N), and hypertensive patients with normal daily activity (group H). In groups R, N, and H, the blood pressure increased in the afternoon and decreased at midnight; in group D, however, although it increased in the afternoon, it did not decrease at night. The circadian changes of the heart rate were similar in all four groups, showing maxima in the afternoon and minima at midnight. Thus, a specific alteration was found in the circadian rhythm of the blood pressure in patients with Alzheimer-type dementia.

Activities of Daily Living↗
PubMed1990

Comparison of the production of cyclic AMP in response to parathyroid hormone in fibroblasts from aged subjects and young subjects: lack of an age-dependent decrease.

An age-dependent effect on the ability to produce cyclic AMP in response to parathyroid hormone (PTH) stimulation was examined using culture skin fibroblasts from both young and elderly female subjects. The mean values of both absolute and comparative production of intracellular cyclic AMP due to various concentrations of PTH administration did not differ between the two age groups, although the mean serum PTH level was significantly higher in the elderly subjects. These results indicate that the decreased response of the target organ to PTH in aged subjects can be explained mainly by the decreased number of intact cells rather than a decreased response of individual cells to PTH.

Adolescent↗
PubMed1990

Possible participation of calcium-regulating factors in senile dementia in elderly female subjects.

um-related factors were compared in 60 elderly female subjects, who were classified into three groups as nondementia group (n = 18), groups of senile dementia of Alzheimer type (SDAT, n = 22) and of vascular type (VTD, n = 20). The group of SDAT showed significant decrease in serum calcium, and increases in serum parathyroid hormone and urinary Ca, and tendency of decrease in serum 1,25-dihydroxyvitamin D, compared to those of the nondementia group. However, the group of VTD, without showing these features, showed a tendency towards decreased serum calcitonin. These results suggest that Ca and Ca-regulating hormones may play several important and different roles in senile dementia.

Aged↗
PubMed1990

Effects of endothelin on neuroeffector junction in mesenteric arteries of hypertensive rats.

The effect of endothelin, a novel vasoconstrictor peptide, on the adrenergic neuroeffector junction was investigated in isolated perfused mesenteric arteries of spontaneously hypertensive rats (SHR) and Wistar-Kyoto (WKY) rats. The vasoconstrictor responses to periarterial sympathetic nerve stimulation and exogenous norepinephrine were determined. Infusion of endothelin-1 increased the baseline perfusion pressure dose dependently to similar extents in the two strains. A subpressor dose of endothelin-1 (10(-10) M) enhanced the pressor response to norepinephrine; its effect was greater in WKY rats than in SHR. Endothelin-1 (10(-12) to 10(-10) M) attenuated the pressor response to sympathetic nerve stimulation, and the degree of inhibition tended to be less in SHR than in WKY rats. Higher doses (3 x 10(-10) and 10(-9) M) of endothelin-1 enhanced the pressor response to nerve stimulation in both WKY rats and SHR. Endothelin-1 inhibited norepinephrine release from rat mesenteric arteries; the inhibition was significantly less in SHR than in WKY rats. These results suggest that endothelin enhances the responsiveness of alpha-adrenergic receptors to catecholamines, whereas it inhibits presynaptic adrenergic neurotransmission. Thus, endothelin can interact with the neuroeffector junction in addition to having a vasoconstricting effect in peripheral vessels. The difference in the mode of modulation by endothelin at the vascular neuroeffector junction in SHR from that in WKY rats might explain the maintenance of hypertension.

Animals↗
PubMed1990

A case of first trimester prenatal diagnosis of 21-hydroxylase deficiency with human complement C4 cDNA probe.

Early prenatal diagnosis of 21-hydroxylase (21-OHase) deficiency would enable treatment to be done to protect the fetus from masculinization and/or life-threatening adrenal crisis at birth. We report here the prenatal diagnosis of 21-OHase deficiency with human complement component C4 cDNA to probe DNA from chorionic villi at 10 weeks of gestation. Southern analysis with human C4 cDNA identified TaqI restriction fragment length polymorphisms (RFLPs) in the family. Family analysis with these RELPs showed that the fetus was not affected at greater than 99% probability, because the frequency of recombination between the 21-OHase B gene and the C4 gene would be extremely low.

Adrenal Hyperplasia, Congenital↗
PubMed1990

Different effect of Helicobacter pylori on the human gastric antral and body mucosal intracellular mucin.

To elucidate the role of Helicobacter pylori infection in the pathogenesis of gastric ulcer, we investigated the intracellular mucin content by measuring the periodic acid-Schiff-Alcian blue (PAS-AB)-stained substances, by means of computer, in the biopsy sample of gastric mucosa from patients with and without H. pylori infection. In the antral mucosa the intracellular PAS-AB-stained mucin content was significantly smaller in patients with infection than in patients without infection, whereas in the oxyntic gland mucosa the intracellular mucin content showed no significant change between patients with and without infection. In an animal study we investigated the effect of ammonia, which might be produced by H. pylori in the presence of urea. The ammonia, administered orally, caused a greater decrease of intracellular PAS-AB-stained mucin content in the gastric antral mucosa than in the body mucosa, in a dose-dependent manner. The results suggested that H. pylori infection had a different effect on the gastric mucosal intracellular PAS-AB-stained mucin and lowered specifically the antral intracellular PAS-AB-stained mucin content, possibly due to generation of ammonia by H. pylori.

Alcian Blue↗
PubMed1990

[Circadian changes of blood pressure in the elderly with Alzheimer's type dementia].

We evaluated the circadian changes of blood pressure in the elderly with Alzheimer's type dementia with ambulatory blood pressure monitoring (ABPM-630, Nihon Colin, Aichi, Japan). Blood pressure and heart rate were high in the daytime and low in the nighttime in the elderly without dementia. Blood pressure did not decrease in the nighttime in the elderly with dementia, although heart rate decreased. Thus, the circadian rhythm of blood pressure was selectively impaired in the elderly with Alzheimer's type dementia.

Aged↗
PubMed1990

Increased plasma level of endothelin with vasoconstriction after dextran infusion.

Our previous study demonstrated that volume expansion with dextran produced blood pressure elevation due to vasoconstriction 3 hours after the cessation of infusion. To examine whether endogenous endothelin contributes to this vasoconstriction, we measured plasma level of endothelin before, immediately after, and 3 hours after the administration of dextran. Plasma level of endothelin decreased immediately after the administration (from 1.5 +/- 0.3 pg/ml to 1.1 +/- 0.2 pg/ml, P less than 0.05), and increased 3 hours after the administration (2.1 +/- 0.3 pg/ml, P less than 0.05). However, the changes in the plasma level of endothelin did not significantly correlated with those in blood pressure or total peripheral resistance. Thus, vasoconstriction after dextran infusion was accompanied by an increase in the plasma level of endothelin, but further evaluation is needed for the direct role of this peptide in the vasoconstrictive blood pressure elevation.

Animals↗
PubMed1990

[Calcitonin].

Explore the source record for details and available documents.

Adenylyl Cyclases↗
PubMed1990

In vivo inhibition of superoxide production and protein kinase C activity in macrophages from vitamin E-treated rats.

Rat peritoneal macrophages, which were induced by intraperitoneal injection of vitamin E for 6 successive days, contained 387.6 to 569.0 ng alpha-tocopherol/10(6) cells and produced 0.9 to 1.5 nmol O2-/min/10(6) cells following stimulation by phorbol myristate acetate (PMA). On the other hand, control macrophages contained 1.7 ng alpha-tocopherol/10(6) cells and produced 3.9 to 4.5 nmol O2-/min/10(6) cells. The particulate fraction of macrophages from vitamin E-treated rats contained 285.2 to 294.4 ng alpha-tocopherol/10(6) cells and showed scarcely any protein kinase C activity, whereas the specific activity of control rats showed 323 to 357 pmol/min/mg protein. From these results, we concluded that vitamin E seems to decrease O2- production from macrophages stimulated with PMA through inhibition of protein kinase C.

Animals↗
PubMed1990

Effect of aspirin on the pressor activity of endothelin.

To examine the inhibition of prostaglandins to the pressor activity of endothelin, hemodynamic changes of dogs pretreated with aspirin in response to endothelin were compared with those of control. In control dogs, endothelin rose blood pressure due to vasoconstriction, with a transient vasodilation in some dogs in the initial phase. In dogs treated with aspirin, the initial vasodilation and the subsequent vasoconstriction were also noted, but the zenith of the total peripheral resistance was observed earlier, compared with control dogs. Thus, prostaglandins do not appear to have a role in the initial vasodilatory action of endothelin, but may modify the long lasting vasoconstriction in the late phase.

Animals↗
PubMed1990

[Towards cloning the gene responsible for myotonic dystrophy].

For the purpose of cloning the gene of myotonic dystrophy (DM) using the technique of reverse genetics, we have introduced new methods such as microdissection, a YAC library and a Not I linking library and cloned many DNA fragments derived from the region of 19q13.2. Then we have assigned these to chromosome 19 by linkage map (CEPH families and linkage disequilibrium) and physical map (PFGE and in situ hybridization). Here we have described these methods.

Chromosome Mapping↗
PubMed1990

[Studies on coagulation-fibrinolytic system in diabetic nephropathy--with reference to plasma TAT and alpha 2PIC].

Coagulation-fibrinolytic system is known to be one of the exacerbating factors in patients with diabetic nephropathy. The aim of the present study was to evaluate whether coagulation-fibrinolytic system in patients with diabetic nephropathy were significantly correlated with the development of this disease using new parameters of plasma thrombin antithrombin III complex (TAT) and plasmin alpha 2 plasmin inhibitor complex (alpha 2PIC). Fifty-six patients with NIDDM were examined. None of these patients showed more than 1.3 mg/dl of serum creatinine levels. These patients were divided into three groups according to the levels of albumin creatinine ratio (ACR) in urine as follows: 1) group I had ACR of less than 30 mg/g.Cr; 2) group II had ACR of greater than 30 mg/g.Cr and less than 100 mg/g.Cr; 3) group III had ACR of greater than 100 mg/g.Cr. Correlations of levels of plasma TAT and alpha 2PIC, levels of HbAlc, duration of diabetes, and presence of retinopathy were determined in these groups. The levels of plasma TAT and alpha 2PIC increased as the levels of urinary ACR increased regardless of presence of retinopathy. The levels of TAT and alpha 2PIC with retinopathy increased compared with those without retinopathy. There was a significantly positive correlation between plasma TAT and alpha 2PIC (r = 0.52, p less than 0.01). The levels of HbAlc and duration of diabetes did not significantly correlate to plasma TAT and alpha 2PIC. These data suggest that the existence of increase in coagulation-fibrinolytic system seem to be one of the exacerbating factors in patients with diabetic nephropathy.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1990

Nicorandil is a potent dilator of endothelin-induced vascular contraction.

Nicorandil, an antianginal drug, is known to open K+ channel and to increase cGMP production. The effects of nicorandil on vascular contraction induced by endothelin (ET), a potent newly discovered vasoconstrictor peptide, were investigated using helical strips from rat thoracic aorta. ET at a concentration of 5 x 10(-9) M induced strong and persistent contraction in the presence of extracellular Ca2+ and similar persistent but smaller contraction in the absence of extracellular Ca2+. Nicorandil at concentrations greater than 10(-7) M, strongly and dose-dependently inhibited ET-induced contraction in the presence of extracellular Ca2+. Nicorandil also suppressed ET-induced contraction in the presence of 10(-4) M methylene blue, an inhibitor of cGMP production, in the presence of extracellular Ca2+ but not in the absence of extracellular Ca2+. ET-induced contraction was also inhibited to lesser extents by the Ca2+ channel blockers nicardipine and verapamil. Nicorandil also strongly suppressed ET-induced increase in cytosolic free Ca2+ concentration in cultured vascular smooth muscle cells. These results suggest that nicorandil is a potent dilator of ET-induced vasoconstriction.

Animals↗
PubMed1990

Stimulatory effect of 1,25-dihydroxyvitamin D3 on transferrin synthesis in primary cultures of adult rat hepatocytes.

The effect of 1,25-dihydroxyvitamin D3 [1,25-(OH)2D3] on protein synthesis was studied in primary cultures of adult rat hepatocytes, in comparison with those of dexamethasone (DEX). The transferrin (TF) level in the culture medium assayed by a radioimmunoassay (RIA), after incubation for 24 hr was increased in the presence of 1,25-(OH)2D3, significantly at concentrations of more than 10(-12) M and maximally to about 140% of that in control cultures at 10(-8) M, without change in the albumin concentrations, assayed by an EIA. Other vitamin D3 metabolites had similar but weaker effects in increasing transferrin synthesis. On the other hand, incubation with 10(-6) M Dex for 24 hr enhanced the syntheses of both transferrin and albumin. Addition of 10(-7) M actinomycin D did not significantly block the effect of 1,25-(OH)2D3, but did suppress that of dexamethasone. These results indicate that 1,25-(OH)2D3 stimulates TF synthesis of cultured rat hepatocytes with different mechanism(s) of action from that of dexamethasone.

Albumins↗