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Biomedical subjects

K Nakata

Publications and source records attributed to K Nakata.

At least 361 records · Page 20Linked to original sources
PubMed1992

Haemodynamic alterations and their morphological basis in biliary obstruction.

The relationship between the haemodynamic alterations and morphological changes in the liver caused by biliary obstruction was investigated in rats after ligation of the common bile duct. In these rats, the portal vein pressure was markedly elevated, and the differences in blood pressure between the portal vein and the terminal portal venule and between the terminal portal venule and the terminal hepatic venule were greater than in the sham-operated rat. The livers showed narrowing of the most peripheral branches of the portal vein due to compression by proliferated bile ductules and sinusoidal stenosis due to enlarged liver cells, but there was no perceptible change in the hepatic vein branches. These data suggest that hepatic circulatory disturbance in biliary obstruction is caused by deformation of the peripheral portal vein branches and sinusoidal stenosis.

Animals↗
PubMed1992

Studies on the antibiotic transfer into the bile of canines with different bile duct pressures.

There have been many studies on the transport of antibiotics into the bile; however, these studies have not taken the bile duct pressure into consideration. The bile duct pressure of the patient with acute obstructive cholangitis is high, and after drainage of the bile, the pressure is not always decreased to the normal range. We studied the effects of the bile duct pressure on the antibiotic (flomoxef sodium) transfer into the bile using beagles after creating the model of acute obstructive cholangitis. Our results showed that sufficient bile flow after drainage is important for the antibiotic transport, and, moreover, the bile acid concentration which may be related to the bilirubin concentration is also highly considerable.

Animals↗
PubMed1992

Inhibitory effect of (4R)-hexahydro-7,7-dimethyl-6-oxo-1,2,5-dithiazocine-4-carboxylic acid (SA3443), a novel cyclic disulfide, on the production of TNF-like factor from Propionibacterium acnes-primed rat liver macrophages/Kupffer cells.

The effect of (4R)-hexahydro-7,7-dimethyl-6-oxo-1,2,5-dithiazocine-4-carboxylic acid (SA3443), a novel cyclic disulfide, on tumor necrosis factor (TNF)-like factor production from Propionibacterium acnes (P. acnes)-primed rat liver macrophages/Kupffer cells was investigated. A remarkable increase in TNF-like activity was detected in the culture supernatants of the liver macrophages/Kupffer cells from P. acnes-treated rats. At concentrations of 1 x 10(-6) to 1 x 10(-4) M, SA3443 significantly inhibited the production/release of TNF-like factor from these P. acnes-primed/activated liver macrophages/Kupffer cells.

Adjuvants, Immunologic↗
PubMed1992

Partial sequence of acid phosphatase-1(1) gene (Aps-1(1)) linked to nematode resistance gene (Mi) of tomato.

A partial amino acid sequence of acid phosphatase-1(1) (apase-1(1)), one of acid phosphatase isozymes of tomato, was identified. This information enabled us to synthesize degenerated primer pools of oligonucleotides for polymerase chain reactions (PCR) using cDNA for poly(A)+ RNA of tomato leaves as a template. As a result, a 135-bp, then a 467-bp PCR product were obtained. Nucleotide sequencing of these two PCR products gave a total of 522-bp sequence that was identified as a part of the Asp-1(1) gene judging from the amino acid sequence deduced from it. Using the 135-bp PCR product as a probe, we detected the restriction fragment length polymorphism (RFLP) in two different lines of tomato by genomic Southern blot analysis. We also did pulsed-field gel electrophoresis (PFGE) and Southern blot analysis to search for suitable fragments to clone into a YAC vector. As a result, a single band with a size that could be cloned into a YAC vector was detected when the genomic DNA was digested with some kinds of restriction enzymes.

Acid Phosphatase↗
PubMed1992

[A case of Legionella pneumonia with myelodysplastic syndrome].

A 40-year-old man was admitted with high fever and cough. Pneumonic shadows of the left middle and lower lung fields increased rapidly, and his blood gases worsened. Initial treatment with cefmenoxime, piperacillin, and minocycline was ineffective. Administration of rifampicin was started for suspected legionella pneumonia, but it did not control the spread of the pneumonia shadows. After addition of an antifungal agent and trimethoprim-sulfamethoxazole, his symptoms gradually improved. Isolation of Legionella pneumophila from sputum specimens collected on the 4th day of admission confirmed the diagnosis on day 10. The patient was then given oral rifampicin plus cefmenoxime to prevent mixed infection, and showed a satisfactory improvement. Legionella pneumonia developed secondary to compromise of the patient's immunity due to steroid therapy for MDS. After recovering from Legionella pneumonia, the patient subsequently developed tuberculous pleurisy and Pneumocystis carinii pneumonia, which were cured by antituberculous therapy and trimethoprim-sulfamethoxazole. However, acute hepatitis followed by hepatic failure developed, and he died on day 121 after admission.

Adult↗
PubMed1992

Acute inhibition of lipid transport in rat intestinal lymph by ethanol administration.

To observe the effect of acute ethanol ingestion on stable lipid transport in intestinal lymph, three groups of mesenteric lymph fistula rats were prepared. In group A rats, lipid emulsion containing 120 mumol/hr of oleate (control meal) was infused intraduodenally for 8 hr. Group B rats were infused with another lipid emulsion, which had the same basic composition as the control meal but included 0.75 g/kg body weight/hr of ethanol (alcohol meal), for 8 hr. In group C, rats were infused with the control meal for the first 4 hr, then with the alcohol meal for the next 4 hr. Lymph flow increased just after the infusion of ethanol, that is, lymph flow in group B was significantly higher than that of group A at 1 and 2 hr, and lymph flow in group C was significantly higher than that of group A at 5 hr. In group A, lymphatic triglyceride (TG) output reached a plateau of more than 30 mumol/hr after 3-hr infusion. TG output in group B was significantly lower than that in group A from 2 hr to 8 hr and was two-thirds that of group A at the plateau level. In group C, TG output was the same as in group A until 5 hr, but decreased to two-thirds of that in group A at 6 hr, 2 hr after replacing the control meal with the alcohol meal. Lymphatic phospholipid output exhibited a tendency similar to that of TG output. Comparisons of group A vs. B and A vs. C clearly demonstrated an inhibitory effect of ethanol on stable lipid transport in intestinal lymph. A 2-hr infusion was enough for ethanol to exhibit its inhibitory effect. In conclusion, stable lymphatic transport of intestinal absorbed lipid was suppressed by acute ethanol ingestion.

Animals↗
PubMed1992

[Adult T cell leukemia with cytomegalovirus retinitis].

A 49-year old female in the course of chemotherapy for adult T-cell leukemia (ATL) noticed blurred vision and visual field defect in her right eye on February 26, 1991. Ophthalmoscopic findings showed exudative necrotizing retinitis with white exudative patches and scattered retinal hemorrhages in both eyes. CMV was isolated from the urine by the shell vial cell culture assay. Anti-viral therapy was commenced using ganciclovir and gamma-globulin, which are rich in anti-CMV antibodies. The exudative lesions were absorbed gradually. The ocular signs and symptoms agreed with the patient's systemic immunosuppressed T cell function state. CMV retinitis should be considered in the differential diagnosis of retinitis in immunocompromised patients. CMV retinitis will certainly be found more frequently in accordance with the increasing number of immunocompromised hosts who have received immunosuppressive therapy or transplantation.

Cytomegalovirus↗
PubMed1992

Superoxide dismutase activity in cataractous lenses.

The relationship between free oxygen radicals and cataract formation has been discussed. The behavior in lenses of the enzyme superoxide dismutase (SOD), which eliminates active oxygen, and glutathione (GSH), which has a defensive action against cataract, were investigated. SOD activity in human cataractous lenses and in porcine lenses was measured by electron spin resonance spectrometry. GSH was measured by high performance liquid chromatography. SOD and GSH significantly decreased in human lenses with senile cataracts as the cataracts advanced. The SOD and GSH values showed a positive correlation. The SOD activity in human lenses was localized dominantly in the lens epithelium and was also found in the shallow layer of the cortex. SOD activity appears to act as a barrier against photooxidation.

Animals↗
PubMed1992

[Ocular hypotensive effect of alpha-adrenoceptor agonist and antagonist in the conscious pigmented rabbit].

It has been reported that some of the topically-used antiglaucomatics have a central ocular hypotensive effect. In this study, the influence of topical and intracerebroventricular (i.c.v.) administration of phenylephrine, clonidine, guanfacine, prazosin, yohimbine on the intraocular pressure (IOP) was investigated in the rabbit. Male pigmented rabbits were used throughout the experiments. For measurement of IOP, an applanation pneumatonograph was used. By unilateral topical administration of phenylephrine, an increase in IOP in the eye in which instillation was performed was observed. On the other hand, a slight decrease in IOP was observed by similar treatment of prazosin and yohimbine. No significant change of IOP in the contralateral eye was observed with these drugs. On the contrary, unilateral topical administration of clonidine or guanfacine decreased the IOP of both eyes. Furthermore, the decrease of IOP was more remarkable in the contralateral eye compared to the eye which received instillation. The IOP of both eyes was decreased in a dose-related fashion by i.c.v. administration of clonidine or guanfacine. The ocular hypotensive effects of clonidine were diminished by the pretreatment by i.c.v. administration with yohimbine. These results suggest that the ocular hypotensive effect of clonidine and guanfacine is due to their alpha 2-adrenoceptor stimulation in the central nervous system.

Administration, Topical↗
PubMed1992

Immunosuppressive factor produced by a B cell line derived from an adult T cell leukemia patient.

The immunosuppressive activity of culture supernatants from human T cell leukemia virus type I (HTLV-I)-infected cell lines was examined in vitro. Culture supernatants of both a HTLV-I-infected B cell line, IWS, established from an adult T cell leukemia (ATL) patient and a T cell line, MT-2, suppressed lymphocyte proliferative responses to stimulation with the mitogens phytohemagglutinin (PHA), concanavalin A (Con A), and pokeweed mitogen (PWM). The immunosuppressive factor was not cytotoxic for lymphocytes and did not inhibit the spontaneous growth of ATL cells. It inhibited interleukin-2 (IL-2) production by PHA-stimulated T cells and it arrested PHA-stimulated T cells at the G0/G1 phase of the cell cycle and inhibited entry into the S phase. Furthermore, the factor significantly inhibited the expression of CD3, CD4, and IL-2 receptor (IL-2R) alpha-chain (CD25) on PHA-stimulated T cells. These results suggest that the immunosuppressive factors produced by HTLV-I-infected cell lines might function in the regulation of normal lymphocyte proliferative responses, and that they could play some role in the induction of the immunodeficient condition observed in ATL patients.

Adult↗
PubMed1992

[Urinary excretion of parathyroid hormone-related protein in patients with adult T-cell leukemia and other hematologic disorders].

Urinary excretion of parathyroid hormone-related protein (PTH-rP) was measured by radioimmunoassay in 25 patients with adult T-cell leukemia (ATL), in 68 patients with other hematologic disorders and in 13 asymptomatic individuals seropositive for human T-cell leukemia virus type I (HTLV-I). The mean levels of urinary PTH-rP in ATL patients with hypercalcemia (11.01 micrograms/g.Cr) were higher than in ATL patients with normocalcemia (5.16 micrograms/g.Cr). The mean levels in patients with acute type (8.84 micrograms/g.Cr), lymphoma type (4.18 micrograms/g.Cr) and crisis ATL (18.20 micrograms/g.Cr) were significantly higher than in urine of healthy controls. However, all asymptomatic carriers of HTLV-I and patients with chronic and smoldering ATL had normal urinary PTH-rP levels. In 7 patients with acute myelogenous leukemia, 1 patient with blastic crisis of chronic myelogenous leukemia and 3 patients with malignant lymphoma, the urinary levels of PTH-rP were above the normal range. Urinary levels of PTH-rP of the ATL patients with hypercalcemia correlated with the serum calcium levels. Urinary levels of PTH-rP of the all ATL correlated with serum lactic dehydrogenase level. These findings suggest that the measurement of urinary levels of PTH-rP is useful for evaluation of ATL and that some tumor cells of other hematologic diseases may produce PTH-rP.

Hematologic Diseases↗
PubMed1992

[Sputum penetration of levofloxacin and its clinical efficacy in patients with chronic lower respiratory tract infections].

Sputum penetration of levofloxacin (LVFX) was evaluated after a single oral dose of 100 mg or 200 mg to 4 patients with copious purulent sputa. The sputum concentration of LVFX reached maximum levels of 1.27 and 4.36 micrograms/ml at 4 hours, and still remained at concentrations of 0.32 and 1.68 micrograms/ml at 8 hours after administration of 100 mg and 200 mg, respectively. The AUC ratio of sputum/serum was 0.9-1.0, indicating good sputum penetration of LVFX in these patients. The clinical efficacy and the safety of LVFX were also evaluated in a total of 13 patients with respiratory tract infections associated with bronchiectasis, diffuse panbronchiolitis, etc. LVFX was administered orally at a daily dose of 200 mg once a day, 100 mg t.i.d. or 200 mg t.i.d. for 7-28 days (mean 14.7 days). The clinical response to the drug was rated as excellent in 1 case, good in 5, fair in 3, and poor in 2 cases in 11 evaluable cases, thus the efficacy rate was 54.5%. All the 3 strains of Haemophilus influenzae were eradicated. Of the 3 strains of Pseudomonas aeruginosa, eradication, decrease, and unchange was observed for 1 strain each. One strain of Streptococcus pneumoniae remained unchanged. No adverse reaction was observed except for 1 case with slight and temporary increase of eosinophils. The above results suggested that LVFX would be clinically useful in the treatment of chronic lower respiratory tract infections.

Aged↗
PubMed1992

[Adult T-cell leukemia with cervical bone tumor showing immunophenotypic change].

A 60-year-old man born in Miyazaki prefecture was admitted to our hospital complaining of skin rash in December 1989. On hematological examinations, leukocyte count was 14,200/microliters with 49% of abnormal lymphocytes showing lobulated nuclei. The surface marker study revealed their phenotype as CD4+8-. Anti human T cell leukemia virus type I (HTLV-I) antibody and monoclonal integration of proviral DNA were positive. From the above results, he was diagnosed as adult T-cell leukemia (ATL). Abnormal lymphocytes gradually decreased without treatment after the first admission. In January, 1990, he began to complain of neck pain. Two months later he was readmitted because of paresis of extremities and disturbance of urination. Vertebral bone mass and a compressed spinal cord in the 4th cervic level were confirmed by MR imaging. He received a resection of tumor and an anterior fusion of vertebrae. The bone tumor was histologically diagnosed as malignant lymphoma, diffuse medium-size cell type and the infiltrating cells had their phenotype as CD4+8+. He was postoperatively treated with combination chemotherapies, but neurological abnormalities did not improve. He died of pneumonia on 35 days after the operation. A postmortem examination revealed extradural tumor formation with ATL cells. This case is considered to be rare in respect of both the disappearance of most peripheral abnormal lymphocytes without any treatments and the cervical bone tumor showing immunophenotypic change.

CD4 Antigens↗
PubMed1992

[Lymphokine-activated killer (LAK) cells and interleukin-2 (IL-2) therapy that improved lymphadenopathy in a patient with B cell non-Hodgkin's lymphoma].

A 70-year-old man was admitted to our hospital on March 9, 1989 because of fever, superficial generalized lymphadenopathy, upper abdominal mass and right pleural effusion. The diagnosis of non-Hodgkin's lymphoma (follicular medium sized cell type, B cell) was made by a biopsy of the neck lymph node. Peripheral blood mononuclear cells were obtained from the patient by cytopheresis. The cells were cultured for 8 days with interleukin-2 (IL-2) to generate Lymphokine-activated killer (LAK) cells. The patient received a total of 7.7 x 10(9) LAK cells intravenously over a period of 3 weeks. He also received continuous intravenous infusion of IL-2 for 17 days, starting 2 days before the first infusion of LAK cells. After this therapy, although his superficial generalized lymphadenopathy disappeared or decreased in size, the size of the upper abdominal mass did not decrease. Therefore, it is suggested that adoptive immunotherapy is a beneficial treatments for B cell lymphoma. However, LAK cells should be generated in much larger quantities for a more successful therapeutic result.

Aged↗
PubMed1991

Growth inhibitory factor of human alveolar macrophage.

The effect of human lung conditioned medium (HLCM) on the DNA synthesis in cultured human alveolar macrophages (HAM) was evaluated. The medium from human lung cultured for 3 days (3d-HLCM) promoted the DNA synthesis as well as the recombinant human GM-CSF does. On the other hand, that cultured for six days (6d-HLCM) did not promote the DNA synthesis but strongly suppressed GM-CSF induced DNA synthesis in HAM. This growth inhibitory effect was also observed when several macrophage like cell lines were cultured with 6d-HLCM. Partial purification of an inhibitory factor on gel permeation HPLC revealed two distinct peaks of activity with molecular weights of 38 kd and 110 kd.

Bronchoalveolar Lavage Fluid↗
PubMed1991

Immunocytochemical localization of argininosuccinate synthetase in the rat brain.

The neuronal distribution of argininosuccinate synthetase (ASS) was mapped in the rat brain. Argininosuccinate synthetase is one of the enzymes of the arginine metabolic pathway and catabolizes the synthesis of argininosuccinate from aspartate and citrulline. Since arginine is the precursor of nitric oxide, argininosuccinate synthetase may act as part of the nitric oxide producing pathway. Argininosuccinate is also suggested to have a messenger function in the nervous system. Therefore, the localization of ASS is of great interest. Polyclonal antisera against purified rat liver argininosuccinate synthetase revealed a characteristic distribution pattern of argininosuccinate synthetase-like immunoreactivity: (1) many neurons with strong argininosuccinate synthetase-like immunoreactivity were observed in the septal area, basal forebrain, anterior medial and premammillary nuclei of the hypothalamus, anterior and midline thalamic nuclei, dorsal endopiriform nucleus of the amygdala, basal nucleus of Meynert, subthalamic nucleus, laterodorsal tegmental nucleus, raphe nuclei, nucleus ambiguus, and the area postrema, (2) neuropile staining was dense in the septal areas, hypothalamus, area postrema, nucleus of the solitary tract, and the laminae I and II of the caudal subnucleus of the spinal trigeminal nucleus and the spinal dorsal horn, (3) relay nuclei of the specific sensory systems such as the dorsal lateral geniculate nucleus and the ventral nuclei of the thalamus were devoid of argininosuccinate synthetase-like immunoreactivity, (4) no staining was seen in the large white matter structures such as the internal capsule, corpus callosum, and the anterior commissure, and (5) most of the neurons stained were small or medium in size and appeared to be interneurons. The results suggest that argininosuccinate synthetase affects the widely distributed, neuromodulatory system in the brain.

Animals↗