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Biomedical subjects

N Eguchi

Publications and source records attributed to N Eguchi.

At least 73 records · Page 4Linked to original sources
PubMed1990

[A case of Stewart-Treves syndrome--treatment with recombinant interleukin 2 and a review of Japanese literature].

A 76-year-old woman developed angiosarcoma 11 years after a radical mastectomy in the chronic lymphedema of the ipsilateral arm, referred to as Stewart-Treves syndrome. The patient was treated by intravenous and intralesional injection of recombinant interleukin 2 (rIL-2; TGP-3, Takeda Chemical Industries, LTD, Osaka). Intralesional injection was more effective than systemic administration. After a month, the lesion where the local injection was done showed little tumor cells with a dense infiltrate composed of lymphoid cells. It was observed that NK activity, LAK activity and IL-2 receptor positive T-cells in the peripheral blood increased during the administration of rIL-2. As the lesion was too large to be treated with rIL-2 alone, radiotherapy was performed. But the patient had no remarkably improvement and died 16 months later from the onset. Immunotherapy with rIL-2 can be useful for angiosarcoma and more effective regimen of rIL-2 is a important problem.

Aged↗
PubMed1989

[Ultrasonic evaluation of two cases of islet cell tumor of the pancreas].

Small pancreatic tumor is difficult to be diagnosed. Two cases of pancreatic islet cell tumors were examined by ultrasonography. One case was islet cell carcinoma, the other insulinoma. In both cases, ultrasonography was useful in detecting the tumor, judging the location of tumor during surgical operation and deciding the surgical procedure.

Adenoma, Islet Cell↗
PubMed1988

Prostaglandin D2 formation and characterization of its synthetases in various tissues of adult rats.

When the amounts of primary prostaglandins formed from endogenous arachidonic acid were determined in homogenates of various tissues of adult rats, prostaglandin D2 was the major prostaglandin found in most tissues. It was formed actively in the spleen (3100 ng/g tissue/5 min at 25 degrees C), intestine (2600), bone marrow (2400), lung (1100), and stomach (630); moderately in the epididymis, skin, thymus, and brain (140-340); and weakly in other tissues (less than 100). Addition of exogenous arachidonic acid (1 mM) accelerated the formation of prostaglandin D2 in all tissues as follows: spleen (15,000); bone marrow, intestine, thymus, liver, and lung (1600-5200); stomach, adrenal gland, epididymis, brain, salivary gland, skin, spinal cord, and seminal vesicle (380-1000); and other tissues (80-310). The activity of prostaglandin D synthetase (prostaglandin-H2 D-isomerase) was detected in 100,000g supernatants of almost all tissues. As judged by glutathione requirement for the reaction, inhibition of the activity by 1-chloro-2,4-dinitrobenzene, and immunotitration or immunoabsorption analyses with specific antibodies, the enzyme in the epididymis, brain, and spinal cord (1.8-9.2 nmol/min/mg protein) was glutathione-independent prostaglandin D synthetase (Y. Urade, N. Fujimoto, and O. Hayaishi (1985) J. Biol. Chem. 260, 12410-12415). The enzyme in the spleen, thymus, bone marrow, intestine, skin, and stomach (2.0-57.1) was glutathione-requiring prostaglandin D synthetase (Y. Urade, N. Fujimoto, M. Ujihara, and O. Hayaishi (1987) J. Biol. Chem. 262, 3820-3825). The activity in the kidney and testis (3.7-4.5) was catalyzed by glutathione S-transferase. The activity in the liver, lung, adrenal gland, salivary gland, heart, pancreas, and muscle (0.6-5.1) was due to both the glutathione-requiring synthetase and the transferase.

Animals↗
PubMed1988

Central action of prostaglandin E2 and its methyl ester in the induction of hyperthermia after their systemic administration in urethane-anesthetized rats.

Intravenous injection of prostaglandin (PG) E2 (0.01-1.0 mg/kg) induced a dose-dependent increase in the rectal temperature of urethane-anesthetized rats; the maximum change attained was 0.14 +/- 0.08 to 1.38 +/- 0.16 degrees C at 23 to 51 min after injection. The i.v. injection of PGE2 methyl ester (PGE2-Me), a lipophilic derivative of PGE2, resulted in hyperthermia 1.5-fold higher than that by PGE2 injection over the same dose range. The hyperthermia was associated with tachycardia, hypertension, cutaneous vasodilation and a rise in abdominal skin temperature. Using [3H]PGE2 and radioimmunoassay, we showed PGE2 to be transported into the brain immediately (15 sec) after the i.v. injection of the PG; the PGE2 content ranged from 2.3 +/- 0.5 to 102.6 +/- 5.5 ng/g of brain when given at 0.01 to 1.0 mg/kg, which was 0.07 to 0.13% of the administered dose. When [3H]PGE2-Me was used, the radioactivity in the brain at 15 sec after injection was 1.3- to 2.9-fold higher than that after [3H]PGE2 injection. However, 80% or more of PGE2-Me was hydrolyzed rapidly and recovered as PGE2 in the brain within 15 sec post-injection. PGE2-Me disappeared within 5 min. When PGE2 or PGE2-Me administered i.v. was followed in terms of PGE2, it decreased gradually in the brain with a half-life of 9.0 to 9.5 min in both cases, and was almost undetectable (less than 0.7 ng/g of brain) at the time when rectal temperature reached a peak. The maximum change and duration of hyperthermia were correlated closely with the PGE2 content in the brain.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1984

Inhibition of indoleamine 2,3-dioxygenase and tryptophan 2,3-dioxygenase by beta-carboline and indole derivatives.

beta-Carboline derivatives inhibited both indoleamine 2,3-dioxygenase and tryptophan 2,3-dioxygenase activities from various sources. Among them, norharman is most potent for both enzymes from mammalian sources. Kinetic studies revealed that norharman is uncompetitive (Ki = 0.12 mM) with L-tryptophan for rabbit intestinal indoleamine 2,3-dioxygenase, and linearly competitive (Ki = 0.29 mM) with L-tryptophan for mouse liver tryptophan 2,3-dioxygenase. In addition, some beta-carbolines selectively inhibited one enzyme or the other. Pseudomonad tryptophan 2,3-dioxygenase was inhibited by a different spectrum of beta-carbolines. Such a selective inhibition by the structure of substrate analogs is more evident by the use of indole derivatives. Indole-3-acetamide, indole-3-acetonitrile and indole-3-acrylic acid exhibited a potent inhibition for mammalian tryptophan 2,3-dioxygenase, while they moderately inhibited the pseudomonad enzyme. However, they showed no inhibition for indoleamine 2,3-dioxygenase. These results suggest the difference of the structures of the active sites among these enzymes from various sources.

Animals↗
PubMed1980

Potassium deficiency enhances the effect of thyroid hormone on NaK-ATPase in liver and kidney.

In order to examine the possibility that the changes in electrolytes in tissue alter the effect of thyroid hormone on NaK-ATPase, rats were fed either synthetic K-deficient diet or synthetic K-normal diet. K-deficient diet induced a reduction in K content in serum or kidney, while that of the liver remained unchanged. When a daily dose of 2.5 micrograms T3 was administered for 7 days to k-deficient rats, both Mg- and NaK-ATPase of the homogenate of liver and kidney were elevated, while the same dose failed to influence those enzymes in K-normal rats. Furthermore, T3 dose increased the Na content of liver and kidney in K-deficient rats, resulting in a significant decrease in th K/Na ratio in those tissue. Based on the estimation from chloride space, the decrease in K/Na was deemed to have occurred mainly in the intracellular space. As the levels of serum thyroid hormone and liver T3 were not influenced by K-deficiency, the effect of K depletion is likely to be mediated not through the alteration in thyroid hormone kinetics, but through some other mechanism such as the elevation of intracellular Na. The present study demonstrates that K deficiency may sensitize NaK-ATPase to the effect of thyroid hormone.

Adenosine Triphosphatases↗
PubMed1979

[A comparison of various indicators of murine thyroid stimulation by LATS (author's transl)].

To obtain an in vitro method of LATS assay which is equally sensitive to a McKenzie bioassay, we compared the quality of cAMP generation-stimulation, thyroidal adenyl cyclase stimulation, and the stimulation of T3-release from mouse thyroid slices. Among those indicators of thyroid stimulation, stimulation by IgG of the release of T3 from incubated thyroid slices is the most sensitive, reproducible and reliable indicator, reflecting faithfully the results of a McKenzie bioassay. Stimulation of cAMP generation in slice manifested less sensitivity, but reasonable reproducibility. However, adenyl cyclase stimulation by IgG of patients with Graves' disease was erratic in two successive experiments, probably due to a non-specific effect of IgG. When adenyl cyclase stimulation was adopted as a sole indicator of thyroid stimulation, the results must be interpreted cautiously.

Adenylyl Cyclases↗
PubMedDate not supplied

Uterus didelphys associated with obstructed hemivagina and ipsilateral renal agenesis: MR findings in seven cases.

BACKGROUND: Although a specific syndrome of the uterus didelphys, obstructive hemivagina, and ipsilateral renal agenesis had been reported in gynecologic literatures, it is not familiar to radiologists. We introduce this syndrome with radiological, especially MR findings. METHODS: Imaging findings and medical records of seven patients with this syndrome were retrospectively reviewed. RESULTS: MR clearly demonstrated uterus didelphys with obstructed hemivagina in six of the seven patients. A remaining one showed uterus didelphys with left-sided hematometra and hematosalpinx who had undergone vaginal septum incision prior to the MR. We could also recognize ipsilateral renal agenesis in all five patients, in whom renal areas were examined on MR. After vaginal septum resection, symptoms disappeared in six patients. We could observe the disappearance of the obstructive complications with MR in three patients. CONCLUSIONS: MR can do much for the early diagnosis and the prevention against further complications of this condition because it can demonstrate the müllerian duct anomaly complicated with obstructed hemivagina in detail and even ipsilateral renal agenesis.

Adolescent↗
PubMedDate not supplied

Segmented areas of increased attenuation in the liver caused by right adrenal tumors: CT features.

OBJECTIVE: Our goal was to describe attenuation differences bordered by a straight line in the right hepatic lobe on enhanced CT in patients with right adrenal tumors and to discuss the cause of this appearance. MATERIALS AND METHODS: Three patients showing attenuation differences bordered by a straight line were discovered in the CT files of 26 cases of right adrenal tumor over 3 cm in diameter. All CT scans were examined by incremental dynamic study. RESULTS: Two patients had large zone of hyperattenuation in the right lobe bordered with a straight line intersecting both anterior branches of the right portal vein and the inferior vena cava (IVC). A third patient and one of the two patients mentioned already had zones of relative hyper- and hypoattenuation in the medial portion of the posterior hepatic segment, respectively. All three patients had large right adrenal tumors, which severely compressed the right hepatic vein near its confluence with the IVC and/or the IVC in or below its intrahepatic portion. The distribution of attenuation differences was similar to the hyperattenuation at CT arteriography or perfusion defect at CT arterial portography under temporary balloon occlusion of the right hepatic vein and inferior right hepatic vein, respectively. CONCLUSION: Straight-bordered attenuation differences within the right hepatic lobe at dynamic CT can be caused by compression of the right hepatic vein by large right adrenal tumors.

Adolescent↗
PubMedDate not supplied

CT of the medial umbilical folds.

PURPOSE: The goal of our study was to investigate the appearance of the medial umbilical folds on CT. METHOD: We retrospectively reviewed the CT images of 30 consecutive patients with massive ascites. In addition, we inspected the inner pelvic wall in cadavers. RESULTS: The medial umbilical folds were well recognized on CT in 21 of 30 patients, bilaterally in 20 and unilaterally in 1. In four patients the folds were undetectable after the ascites resolved. The CT findings were supported by those studied in cadavers, in which the folds were recognized as a peritoneal reflection in 13 of 20. CONCLUSION: We concluded that medial umbilical folds could be commonly visualized on CT when ascites was present.

Administration, Oral↗
PubMedDate not supplied

Von Meyenburg complexes of the liver: imaging findings.

PURPOSE: Our purpose was to present imaging findings of six cases proven or supposed to be von Meyenburg complexes (VMCs) with a basis of reviewing the pathologic literature and to describe imaging points for the diagnosis of typical VMC along with its differential diagnosis. METHOD: Six cases were diagnosed as VMC of the liver with imaging modalities (one had histopathologic proof). Both ultrasound (US) and CT were available for all cases, and MRI was used for three cases. Follow-up with US, CT and/or MRI was performed in five cases. RESULTS: US detected varying abnormalities of the livers in four cases. CT and MRI revealed multiple or numerous intrahepatic tiny (usually < 5 mm) cystoid lesions in all of the cases. The lesions were scattered throughout the livers, and some of them were located more frequently adjacent to the medium-sized portal veins than to the hepatic veins of similar size on CT. Moreover, some lesions were apparently located in the subcapsular areas (up to the hepatic capsules). They were usually irregular in shape and showed no enhancement but increased in number by approximately 80-150% after administration of intravenous contrast medium. The T2-weighted MR images and MR cholangiopancreatography showed the lesions to be much more apparent and to be more numerous than T1-weighted images did. Follow-up of five cases with imaging modalities did not show remarkable change of the lesions. CONCLUSION: Despite our limited experience, VMC lesions seem to show some CT and MR features different from those of other multiple small hepatic lesions. They presented as multiple or numerous intrahepatic tiny cystoid lesions usually with irregular contour, scattered throughout the liver up to the subcapsular areas, and were detected in far greater number by enhanced CT or T2-weighted MR images than by unenhanced CT or T1-weighted images. They showed no remarkable change on long term follow-up imaging. We propose that a diagnosis of typical VMC could be made after analyzing CT or MR images carefully with good understanding of its pathologic basis, but imaging follow-up is necessary in oncology patients.

Aged↗