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Biomedical subjects

R Suzuki

Publications and source records attributed to R Suzuki.

At least 631 records · Page 35Linked to original sources
PubMed1986

Seven cases of pelvic exenteration combined with sacral resection for locally recurrent rectal cancer.

Local recurrence of rectal cancer following abdominoperineal resection is rarely amenable to limited resection. Carcinoembryonic antigen assay is valuable for diagnosing most recurrent rectal cancers, but it is inadequate for early detection. Pelvic computed tomography examination is very valuable for the early detection and localization of recurrence in relation to pelvic structures and can also serve as a guide in percutaneous needle biopsy of the tumor. Seven patients with deeply invading recurrent lesions underwent pelvic exenteration combined with sacral resection. The ileal segment conduit was used for ureteral urinary diversion. The mean operation time and blood loss were 8.8 hours and 6,200 ml, respectively. No operative deaths were encountered. One patient is alive 22 months postoperatively with no evidence of disease, and another patient is alive 32 months postoperatively with pelvic wall recurrence. This procedure seems a reasonable treatment for palliation and full recovery in certain patients.

Adult↗
PubMed1986

Interleukin 2-activated killer cells: generation in collaboration with interferon gamma and its suppression in cancer patients.

The generation of lymphokine activated killer (LAK) cells by recombinant IL2 (rIL2) in collaboration with interferon gamma (IFN gamma) was examined in peripheral blood mononuclear cells (PBMC) from patients with malignant tumors of the digestive organs and breast cancer. LAK cytotoxicity could be induced by rIL2 at 10 units/ml in 10 of 12 patients and 20 of 37 using fresh autologous tumor cells and PK-1, an established solid tumor cell line as a target, respectively. Among 34 patients, in which titers of IFN gamma produced were assayed, 12 showed no IFN gamma production. All of these 12 patients had no or extremely low LAK activity, suggesting the correlation of LAK generation with the production of IFN gamma in response to rIL2. LAK induction by rIL2 in PBMC of cancer patients was almost completely inhibited by addition of anti-IFN gamma serum. Depressed LAK generation, which was accompanied by no or low levels of IFN gamma production, was partially restored by addition of exogenous recombinant IFN gamma. These results indicate that LAK induction by rIL2 in cancer patients involves the production of IFN gamma and its interaction with rIL2. The results also suggested the presence of a factor(s) suppressing LAK induction by rIL2 in the serum of cancer patients. Based on these results, the cancer patients could be divided into the following three groups. Group 1, in which the serum suppressor activity was undetectable, had the same level of LAK cytotoxicity in PBMC as healthy controls. Group 2 showed the serum suppressor factor and had the lower level of cytotoxicity in PBMC when cultivated in autologous serum (AS) compared to healthy controls. The depressed LAK induction in AS medium was restored to a normal level in culture with fetal calf serum (FCS) plus rIL2, or by addition of rIFN gamma, or high concentrations of rIL2 in AS medium. The last group (group 3), in which the serum suppressor factor was also found, had the lowest level of cytotoxicity compared to healthy controls. The LAK induction in these patients could not be restored to a normal level by culture in FCS medium, addition of exogenous rIFN gamma or high concentrations of rIL2, suggesting the possibility that the deficit of LAK generation in this group might involve the dysfunction or the lack of IL2 responder cells, in addition to the presence of a serum suppressor factor(s).

Breast Neoplasms↗
PubMed1986

Macrophages can produce factors capable of inducing histidine decarboxylase, a histamine-forming enzyme, in vivo in the liver, spleen, and lung of mice.

Injection into mice of culture supernatant of P388D1 cells, a murine macrophage cell line, produced a rapid increase in histidine decarboxylase (HDC) activities in the liver, spleen, and lung. Factors in the culture supernatant capable of inducing the HDC elevation were purified by gel filtration and chromatofocusing. Throughout these procedures, the HDC-inducing activity accompanied the mitogenic activity for thymocytes or interleukin 1 (IL-1) activity. Although, because of low purity of the preparations, it is not confirmed whether the HDC inducer is IL-1 itself or not, the present results indicate that P388D1 cells can produce a factor(s) capable of inducing HDC in mouse tissues in vivo. After the injection of the HDC-inducing factor into mice, HDC induction in the tissues occurred within 2 hr and peaked at 2 to 4 hr, resulting in the increase in histamine levels 1 to 10 nmol/g tissue. These results provide important information concerning the source of endogenous histamine that might be involved in inflammatory reactions in delayed-hypersensitivity reactions or in the immune regulation observed in many in vitro systems.

Animals↗
PubMed1986

Effects of divalent cations on the spontaneous synchronization in mammalian iris sphincter muscle cells.

The appearance of automatic activity in mammalian iris sphincter muscle cells upon treatment with Ba2+ was investigated in vitro, using tension measurement and the sucrose-gap method. In isolated cattle and rabbit sphincter muscles (0.7-1 mm wide, 5-mm long), contraction induced by electrical nerve stimulation (0.3 msec) was inhibited in Ca2+-free solution. Application of Ba2+ produced a rapid contraction in a dose-dependent manner followed by spontaneous activities, even in the presence of 10(-6) M atropine and/or tetrodotoxin, thereby indicating the generation of myogenic automaticity. Ca2+ and Mg2+ had dual effects on such a Ba2+-induced automaticity; that is, excitatory action in very low doses (cattle less than 0.2 mM; rabbit less than 0.3 mM) and inhibitory action in high doses (cattle, rabbit greater than 0.5 mM). In case of the iris sphincter from albino rabbits, we recorded action potentials and the following plateau, using sucrose-gap method. Although the iris sphincter is classed as a multi-unit smooth muscle and is inactive without neuronal influences, in the present experiments this muscle did exhibit spontaneity without neuronal influences, in the presence of Ba2+. These results may suggest that Ca2+ and/or Mg2+ present in high concentrations in the aqueous fluid probably leads to stabilization of the iris sphincter muscle membrane and masking of the spontaneous activity.

Action Potentials↗
PubMed1986

Characterization of DNA primase separated from DNA polymerase alpha-DNA primase complex of calf thymus.

It has been shown that DNA primase activity is tightly associated with 10S DNA polymerase alpha from calf thymus (Yoshida, S. et al. (1983) Biochim. Biophys. Acta 741, 348-357). In the present study, the primase activity was separated from DNA polymerase alpha by treating purified 10S DNA polymerase alpha with 3.4 M urea followed by a fast column chromatography (Pharmacia FPLC, Mono Q column equilibrated with 2 M urea). Ten to 20 % of the primase activity was separated from 10S DNA polymerase alpha by this procedure but 80-90% remained in the complex. The separated primase activity sedimented at 5.6S through a gradient of glycerol. The separated primase was strongly inhibited by araATP (Ki = 10 microM) and was also sensitive to salts such as KCl (50% inhibition at 30 mM). The primase used poly(dT) or poly(dC) as templates efficiently, but showed little activity with poly(dA) or poly(dI). These properties agree well with those of the primase activity in the DNA polymerase alpha-primase complex (10S DNA polymerase alpha). These results indicate that the calf thymus primase may be a part of the 10S DNA polymerase alpha and its enzymological characters are preserved after separation from the complex.

Animals↗
PubMed1986

Interleukin-1-like activity in horny layer extracts: decreased activity in scale extracts of psoriasis and sterile pustular dermatoses.

Interleukin-1 (IL-1)-like activity was assessed in scale extracts prepared from skin specimens from 36 cases of psoriasis and other dermatoses characterized by the formation of sterile subcorneal pustules. IL-1 activity was detected in only 2 samples. In contrast, much higher IL-1 activity was demonstrated in horny tissue extracts prepared either from normal skin or from noninflammatory skin such as plantar callus, scar or ichthyosis. No correlation was found between neutrophil chemotactic activity and IL-1 activity demonstrable in horny tissue extracts.

Callosities↗
PubMed1986

The effect of 1 alpha-hydroxyvitamin D3 on cell-mediated immunity in hemodialyzed patients.

The immunoregulatory effect of 1 alpha-hydroxyvitamin D3 (1 alpha OHD3), a precursor form of active vitamin D3, was examined in hemodialyzed patients. Four weeks of oral administration of 0.5 micrograms/day 1 alpha OHD3 markedly enhanced the lymphoproliferative responses to mitogens without influencing lymphocyte counts or the ratios of lymphocyte subpopulations. In fact, these responses were nearly normal after treatment. These results suggest that deficiency of 1,25-dihydroxyvitamin D3 may play a role in the impairment of cellular immunity in hemodialyzed patients, and that administration of 1 alpha OHD3 may have therapeutic immunological benefit.

Adult↗
PubMed1986

Nuclear bodies in human prostate with special reference to appearance rate.

The Nuclear Body Appearance Rate in seventeen human prostatic cases was statistically analyzed according to three lesion areas--the hyperplastic nodule, non-nodule and atrophic--in the secretory epithelium and basal cells. It was meaningfully high in the secretory epithelium of the hyperplastic nodule, but not in the other two lesion areas. There was no meaningful result in basal cells. Though there is a wide variety of reported data on the human prostate, particular care must be taken in analysis at the electron microscopic level, keeping in mind that even in a single specimen this organ has a notable variety of tissue changes. The Nuclear Body Appearance Rate reflects cellular hyperactivity although it does not have a specific known function at present.

Atrophy↗
PubMed1986

Effect of interleukin 1 on chemotaxis and chemiluminescence of human neutrophils.

We studied the influence of interleukin 1 (IL 1) on chemotaxis and chemiluminescence (CL) of human neutrophils. We found that IL 1 showed chemotactic activity within the concentrations ranging from 1 to 200 U/ml, whereas no luminol-or lucigenin-dependent CL was noted in neutrophils with the stimulation of IL 1 at the concentrations ranged from 1 to 100 U/ml. Moreover, no enhancement of zymosan-induced CL was observed in neutrophils following prior exposure to IL 1 at a concentration of 100 U/ml for 60 min at 37 degrees C. We think that IL 1 may be responsible for the inflammatory reaction only through its chemotactic activity for neutrophils without enhancement of the oxidative metabolism of neutrophils.

Acridines↗
PubMed1986

A case of renovascular hypertension with the nephrotic syndrome.

Nephrotic range proteinuria occurred in a 42-year-old woman with renal arterial occlusion and hyperreninemia. The administration of captopril, an angiotensin converting enzyme inhibitor, led to an amelioration of the proteinuria and the decrease of blood pressure, without surgical treatment. From the present observation, it is highly probably that the increased activity of the renin-angiotensin system plays an important role in massive proteinuria. Conservative treatment for renovascular hypertension with nephrotic syndrome was effective in this patient.

Adult↗
PubMed1986

Presence of chemotactic peptides other than C5a anaphylatoxin in scales of psoriasis and sterile pustular dermatoses.

A unique leukocyte chemotactic factor of around 12 kD molecular weight has been suggested to be responsible for the mechanisms involved in transepidermal migration of leukocytes observed in psoriasis and related sterile pustular dermatoses. Although we confirmed with radioimmunoassay the presence of a C5-cleavage product in the chemotactic fractions from psoriatic scale extract eluted by gel filtration HPLC, the neutrophil chemotactic activity demonstrated in the peak fraction was only partially inhibited by rabbit antiserum to human C5a, whereas that noted in the peak fraction, prepared from zymosan activated serum, was totally abrogated by the same treatment. Similarly the chemotactic fraction prepared from the scale extracts of other related pustular dermatoses were only partially inhibited with anti-C5a antiserum. These findings suggest that chemotactic peptides other than C5a also play a role in the transepidermal migration of leukocytes in these dermatoses.

Animals↗
PubMed1986

Reconstruction of electrocardiogram using ionic current models for heart muscles.

A digital computer model is presented for the simulation of the electrocardiogram during ventricular activation and repolarization (QRS-T waves). The part of the ventricular septum and the left ventricular free wall of the heart are represented by a two dimensional array of 730 homogeneous functional units. Ionic currents models are used to determine the spatial distribution of the electrical activities of these units at each instant of time during simulated cardiac cycle. In order to reconstruct the electrocardiogram, the model is expanded three-dimensionally with equipotential assumption along the third axis and then the surface potentials are calculated using solid angle method. Our digital computer model can be used to improve the understanding of the relationship between body surface potentials and intracellular electrical events.

Computer Simulation↗