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Biomedical subjects

S Kin

Publications and source records attributed to S Kin.

At least 19 recordsLinked to original sources
PubMed1992

Successful 96-Hr cold-storage preservation of canine pancreas with UW solution containing the thromboxane A2 synthesis inhibitor OKY046.

Prostanoids, such as prostacyclin (PGI) and thromboxane A2 (TxA), have been recently suggested to play an important role in preservation-induced injury of pancreas grafts. We have previously shown that the TxA synthesis inhibitor OKY046 prevents a decrease of both the PGI/TxA ratio and blood flow in pancreas grafts after 24-hr preservation with Euro-Collins solution. In our present study, we analyzed whether OKY046 added to University of Wisconsin (UW) solution could extend successful cold-storage preservation of segmental canine pancreas grafts, compared with UW alone. We divided 30 dogs into four preservation groups: Group 1, UW solution for 72 hr (n = 7); Group 2, UW solution for 96 hr (n = 8); Group 3, UW solution plus OKY046 (10(-4) M) for 72 hr (n = 7); and Group 4, UW solution plus OKY046 (10(-4) M) for 96 hr (n = 8). After the cold storage period, segmental pancreas auto-transplantation with immediate completion pancreatectomy was done. Preservation was deemed successful if serum glucose less than 150 mg/dl was maintained for at least 5 days. Intravenous glucose tolerance tests and biopsies were done in those dogs with functioning grafts 14 days post-transplant. Successful preservation rates were as follows: Group 1, 57.1%; Group 2, 12.5%; Group 3, 100%; and Group 4, 75%. The mean K values (+/- standard error) were: Group 1, 1.54 +/- 0.13; Group 2, 0.59; Group 3, 1.54 +/- 0.14; and Group 4, 1.59 +/- 0.24 (not statistically different).(ABSTRACT TRUNCATED AT 250 WORDS)

Adenosine↗
PubMed1992

Heterotopic autotransplantation of the distal pancreas segment after total pancreatectomy for cancer of the head of the pancreas.

Autotransplantation of the distal pancreas segment with pancreaticojejunostomy was performed in four patients with cancer of the head of the pancreas to preserve endocrine pancreatic function after extended total pancreatectomy. All patients had tumor involvement of both the celiac axis and the portal vein. The pancreatic graft was determined to be cancer-free by frozen section histologic and pancreatic juice cytologic examinations. The distal pancreas segment was autotransplanted to the iliac vessels heterotopically and placed in the extraperitoneal pocket to avoid untoward effects of any local recurrence or pancreatic leakage. This procedure, in the form of reconstruction, might be called modified subtotal pancreatoduodenectomy. Postoperatively, all patients remained normoglycemic without exogenous insulin administration, and their quality of life was considered satisfactory.

Aged↗
PubMed1990

[The inhibitory effects of glycyrrhizin and glycyrrhetinic acid on the metabolism of cortisol and prednisolone--in vivo and in vitro studies].

This experiment was carried out to investigate the inhibitory effects of glycyrrhizin and its aglycon, glycyrrhetinic acid, on the metabolism of cortisol and prednisolone in vivo and in vitro. The effects of glycyrrhetinic acid on the metabolism of cortisol were examined in vitro using rat and bovine liver homogenate. Glycyrrhetinic acid inhibits both hepatic delta 4-5-reductase and 11 beta-hydroxysteroid dehydrogenase in a dose-dependent manner, resulting in the decrease of conversion of cortisol to cortisone, dihydrocortisol and tetrahydrocortisol in rats. The concentrations of glycyrrhetinic acid inducing 50% inhibition of rat liver delta 4-5-reductase and 11 beta-hydroxysteroid dehydrogenase were 2.5 x 10(-6) M and 8.5 x 10(-6) M, respectively. Glycyrrhetinic acid also inhibits bovine liver 11 beta-hydroxysteroid dehydrogenase and 20-hydroxysteroid dehydrogenase in a dose-dependent manner, resulting in the decrease of conversion of cortisol to dihydrocortisol and prednisolone to 20-dihydroprednisolone. The concentrations of this drug inducing 50% inhibition of 11 beta-hydroxysteroid dehydrogenase and 20-hydroxysteroid dehydrogenase were 8.2 x 10(-6) M and 6.5 x 10(-6) M, respectively. This is the first report which demonstrates the marked inhibitory effects of glycyrrhetinic acid on 11 beta-hydroxysteroid dehydrogenase and 20-hydroxysteroid dehydrogenase in vitro. The effects of glycyrrhizin on the rate of metabolism of cortisol as well as prednisolone were studied in 23 patients with or without adrenal insufficiency. Glycyrrhizin had no effect on diurnal rhythm of plasma cortisol in 7 control subjects with normal pituitary adrenal axis, whereas glycyrrhizin significantly increased the half-time (T 1/2) and area under the curve (AUC) for plasma cortisol in 4 patients with adrenocortical insufficiency taking oral cortisol. Glycyrrhizin also increased T 1/2 and AUC for plasma prednisolone in 12 patients taking an oral prednisolone for at least 3 months. These results indicate that the suppression of hepatic delta 4-5-reductase, 11 beta-hydroxysteroid dehydrogenase and 20-hydroxysteroid dehydrogenase by glycyrrhizin and glycyrrhetinic acid may delay the clearance of cortisol and prednisolone and prolong the biological half-life of cortisol or prednisolone.

11-beta-Hydroxysteroid Dehydrogenases↗
PubMed1990

[Diffusion imaging using three orthogonal diffusion encoding gradients].

A new pulse sequence for in vivo diffusion measurements by magnetic resonance imaging is introduced. The proposed sequence employed gradient sensitization in three orthogonal directions to accentuate the effects of diffusion. The amplitudes and durations of the diffusion encoding gradients were carefully selected to achieve optimal signal-to-noise ratio in diffusion imaging. The pulse sequence was implemented on a superconducting whole body imager operating at 1.5 T. The self-diffusion coefficient of water in a bottle was measured to be 2.17 +/- 0.089 X 10(-9) m2/sec at 23 degrees C consistent with other previous measurements. A preclinical study with a human volunteer was also performed and results were presented.

Brain↗
PubMed1990

[The significance of cGMP and dopamine receptor on the natriuretic and hypotensive activities of synthetic atrial natriuretic polypeptide in essential hypertension].

This study was undertaken to clarify the role of dopamine receptor (DA2) on the effects of atrial natriuretic polypeptide(ANP) on blood pressure, plasma and urinary cyclic GMP, and urinary sodium excretion, alpha-human ANP (alpha-hANP) was intravenously administrated to 7 normal subjects and 14 patients with essential hypertension as follows: first a dose of 0.01 micrograms/kg/min for 30 minutes, and then 0.03 micrograms/kg/min with or without metoclopramide(MC) for 30 minutes. After the infusion of the 0.03 micrograms/kg/min dose of alpha-hANP, systolic blood pressure fell from 115 +/- 17 mmHg to 109 +/- 15 mmHg in normal subjects, and fell significantly from 163 +/- 33 mmHg to 145 +/- 26 mmHg in patients with essential hypertension. Diastolic blood pressure fell from 101 +/- 14 mmHg to 92 +/- 7 mmHg in patients with essential hypertension but did not change in normal subjects. A dose of 0.03 micrograms/kg/min of alpha-hANP led to a threefold rise in urine volume and twofold rise in urinary sodium excretion in normal subjects, and a fivefold rise in urine volume and fourfold rise in urinary sodium excretion in patients with essential hypertension. However, there was no relationship between the hypotensive and natriuretic effects of alpha-hANP in either normal subjects or patients with essential hypertensions. The infusion of a 0.03 micrograms/kg/min dose of alpha-hANP increased plasma cyclic GMP concentration from 4.1 +/- 2.1 pmol/ml to 34.3 +/- 25.Opmol/ml in normal subjects and from 4.5 +/- 2.6 pmol/ml to 20.3 +/- 7.4 pmol/ml in patients with essential hypertension. The rise in plasma cyclic GMP by alpha-hANP was suppressed by MC both in normal subjects and patients with essential hypertension. Urinary cyclic GMP excretion also increased during the infusion of alpha-hANP, but this effect was not suppressed by MC. Furthermore, plasma aldosterone concentration (PAC), which was depressed by alpha-hANP in normal subjects and patients with essential hypertension, was increased by MC. These results suggest that the hypotensive effect of alpha-hANP may depend not only on the natriuretic effect, but also on vasodilatation, the inhibition of aldosterone production or the suppression of the sympathoadrenomedullary system. Cyclic GMP may be produced through the DA2 receptor in vascular tissue but not in the kidney.

Aldosterone↗
PubMed1990

Expression of T-cell receptor (TCR)alpha chain on normal human tonsils and T-cell lymphomas.

We analyzed immunohistologically the expression of T-cell receptor (TCR)alpha chain on human tonsils and on T-cell lymphoma (T-ML) tissues using the avidin-biotin-peroxidase method. A murine monoclonal antibody alpha F1, specific for the constant region of the TCR alpha chain, was employed. On normal tonsil, alpha F1-positive cells were observed mainly in T-zones and germinal centers. In T-zones, the staining intensities varied markedly, with heavy staining evident in less than one fourth. In germinal centers, a proportion of stained cells showed a histiocytic pattern with small cytoplasmic projections. All the T-ML tissues expressed TCR alpha, whereas the staining intensities varied among cases and among lymphoma cells. No correlations were observed in the expressions of TCR alpha chain and other T-cell markers including CD3, CD4 and CD8.

Antigens, Differentiation, T-Lymphocyte↗
PubMed1989

[The role of Na+-K+ ATPase activity on blood pressure regulation and sodium metabolism in DOCA-treated rats].

In this study, we attempt to clarify the role of sodium-potassium adenosine 5'-triphosphatase (N+-K+ ATPase) on the regulation of systemic blood pressure and renal sodium metabolism. Male Wistar rats (n=20) were divided into four groups: 1) controls (n=5), 2) sodium loading rats (NaCl group, n=5), 3) deoxycorticosterone (DOCA group, n=5) injected rats with intact kidneys (DOCA group, n=5), 4) DOCA and ouabain-injected rats with intact kidneys (ouabain groups) and raised for six weeks. The changes in urine volume and urinary sodium were determined, and urinary excretions of norepinephrine (NE), epinephrine (E) and dopamine were measured in week six. Then blood samples were obtained from the inferior vena cava, and plasma cyclic AMP (cAMP) and cyclic GMP (cGMP) concentration were measured. At the time of sacrifice, systolic blood pressure of the ouabain group (157.3 +/- 24.8 mmHg) was significantly higher than the control group (124.5 +/- 6.9 mmHg) (p less than 0.05), but no significant differences were observed between the control group, NaCl group (123.7 +/- 7.0 mmHg), and DOCA group (128.1 +/- 4.5 mmHg). Urine volume and sodium excretion in the NaCl, DOCA and ouabain groups all increased, but the natriuretic response in the NaCl group was smaller than in either the DOCA and ouabain groups. Urinary NE in the NaCl, DOCA and ouabain groups was 1396 +/- 1025 ng/day, 640 +/- 351 ng/day, 607 +/- 177 ng/day, respectively, and NE excretions in these groups were higher than in the control group (138 +/- 104 ng/day). Urinary E in the NaCl group was higher than in the control group, but there were no significant differences among the control, DOCA and ouabain groups. Urinary dopamine in the NaCl (5723 +/- 2028 ng/day), DOCA (7661 +/- 5992 ng/day) and ouabain (4077 +/- 1984 ng/day) groups was higher than in the control group (2081 +/- 483 ng/day). Plasma cAMP in the DOCA and ouabain groups was slightly higher than in the control group, while no significant differences in plasma cAMP between the control and NaCl groups were observed. Plasma cGMP in the DOCA group was slightly higher than in either of the other three groups. These results suggest that Na+-K+ ATPase may play an important role in the maintenance of blood pressure through sodium efflux and that ouabain, Na+-K+ ATPase inhibitor, may change the renal sodium excretion and vascular responsiveness to endogenous pressor substances, leading to higher blood pressure after the administration of sodium and mineralocorticoid.

Animals↗
PubMed1989

[T-cell lymphoma of the skin--clinicopathological relationships, therapy and survival].

We investigated the pretreatment characteristics and prognosis of T-cell lymphomas, including mycosis fungoides (MF), T-cell lymphoma of the skin other than MF (CTL), adult T-cell leukemia/lymphoma (ATL), immunoblastic lymphadenopathy (IBL)-like T-cell lymphoma and angioimmunoblastic lymphadenopathy with dysproteinemia (AILD), as well as B-cell lymphoma of the skin (CBL) and analyzed the prognostic factors for skin T-cell lymphoma when the skin was the organ initially or predoienantly involved. Twenty-eight cases of erythematous-stage MF, ten cases of plaque-stage MF, eleven cases of tumor-stage MF, twelve cases of ATL, eleven cases of IBL-like T-cell lymphoma/AILD, and eight cases of CBL were studied. CTCL patients were treated by photochemotherapy with topical 8-methoxypsoralen (8-MOP) followed by VUA irradiation, electron-beam irradiation, or systemic chemotherapy. Complete remission (CR) was obtained with all of these therapies. However induction of CR was not a major prognostic factor in skin T-cell lymphoma, and the clinical stage was more valuable in this respect. No cases of death occurred among erythematous-stage MF patients, but eight out of 11 patients with tumor-stage MF died (mean survival rate, 38 months). The prognosis for tumor-stage MF was better than that of ATL (19 months) or IBL-like T cell lymphoma/AILD (28 months), but worse than those of erythematous-a plaque-stage MF. TNM staging of CTCL was also a useful factor for prognosis.

Aged↗
PubMed1989

[Operative results in cancer of the pancreas, especially complicated with large vascular involvement].

Surgical treatment has been performed in 25 cases of cancer of the pancreas. Localized large vascular involvements of portal vein, celiac axis, common hepatic artery and/or superior mesenteric artery by the pancreatic cancer were observed in 11 cases, which necessitated total or subtotal pancreatectomy associated with segmental resection of the vessels with vascular reconstruction in 7 cases but in remaining 4 cases resectional procedure was not performed. Curative pancreaticoduodenectomy was carried out in 5 cases without large vascular involvement and non-curative pancreatectomy in one case. Exploratory laparotomy or only anastomosis for the bile duct or the intestine was done in 8 cases. The operative resectability rate was 52% and the curative one was 44%. The regional pancreatectomy seemed to contribute to improvement of resectability. However, one year survival rate was only 42% (2 year, 0%) in the curatively resected cases with large vascular involvement, while 5 year survival rate was 67% in those without vascular involvement. The quality of life after extended total pancreatectomy was distressful. On the other hand, two extended totally pancreatectomized cases with successful autotransplantation of distal pancreas are living at one year and 3 months after operation respectively, and enjoying the common social life at present.

Aged↗
PubMed1986

[A clinical report of vascularized segmental pancreatic autotransplantation in chronic pancreatitis].

A vascularized segmental autotransplantation of distal 80% of the pancreas to the right iliopelvic space was successfully performed in a 51-year-old male who had alcoholic chronic pancreatitis. Distal 80% of the gland with severe calcified pancreatitic change was resected and prepared for transplantation by injecting the splenic artery with Ringer's lactate solution containing heparin, albumin and gabexate mecilate cooled to 4 degrees C. The spleen was removed from the specimen. An arteriovenous fistula was constructed at the tail. End-to-side anastomosis of spleno-external iliac veins was carried out after small fusiform resection of the iliac venous wall for the purpose of sufficient venous patency. End-to-end anastomosis of spleno-hypogastric arteries was done. The pancreatic stump was anastomosed to the ileum. Post-operatively, the pain completely resolved. Patency of the graft was demonstrated by angiography. Higher response of the C-peptide immunoreactivity on 75 g OGTT was found in the iliac vein on the transplanted side than in another peripheral vein. The exocrine pancreatic function diagnostant test showed 78.8% post-operatively (vs. 63.2% pre-operatively). Vascularized segmental pancreatic autotransplantation offers an excellent method of relieving pain with preservation of endocrine and exocrine functions in selected cases with chronic pancreatitis.

Chronic Disease↗