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Biomedical subjects

N Minato

Publications and source records attributed to N Minato.

At least 109 records · Page 6Linked to original sources
PubMed1989

[Treatment of congenital tracheal stenosis. Retrospective study of thirteen cases].

Thirteen cases of congenital tracheal stenosis (CTS) were retrospectively studied in terms of operative indication and treatment. The intratracheal transverse ratio of the stenotic/normal diameter (stenotic ratio, SR) was obtained by chest X-ray, tracheogram or autopsy, as one of the parameters of stenosis. SR ranged from 0.14 to 0.50 (mean 0.35 +/- 0.13 SD). Two cases (SR = 0.14) received tracheal resection and reanastomosis successfully. In three cases with pulmonary artery sling (PAS), PA translocation was performed to release tracheal compression. One (SR = 0.49) had good result but two (SR = 0.20, 0.30) died from respiratory failure (RF) and autopsy revealed PAS. Four cases underwent surgery for congenital heart disease (CHD), 3 (SR = 0.41, 0.46, 0.49) had good results but one (SR = 0.36) died from RF. In four cases medically treated, 3 (SR = 0.40, 0.44, 0.50) improved with growth but one (SR = 0.25) died before operation due to RF and autopsy revealed PAS. When SR greater than or equal to 0.40, cases without PAS improved with conservative treatment, those with PAS improved by PA translocation, and those with CHD tolerated open heart surgery. When SR less than 0.40, tracheal reconstruction is indicated. Cases with PAS would require primary or staged operation of PA translocation + tracheal reconstruction. The most appropriate therapy should be selected on the basis of symptoms, associated diseases and parameter of tracheal stenosis, for instance "SR".

Anastomosis, Surgical↗
PubMed1989

[A case report of concomitant surgery of mitral regurgitation and lung cancer].

We report a case of 70-year-old woman who was simultaneously operated on mitral valve replacement for severe mitral regurgitation and the right middle lobectomy for adenocarcinoma through a median sternotomy. Concomitant cardiac and pulmonary operation can be safely performed through a median sternotomy excluding left lower lobectomy.

Adenocarcinoma↗
PubMed1989

[A successful surgical treatment of left coronary artery-pulmonary artery fistula with giant saccular aneurysm].

A surgical case of left coronary artery-pulmonary artery fistula with giant saccular aneurysm was reported. The aneurysm was successfully resected under total extra-corporeal circulation. The patient was 67-year-old female who was admitted for evaluation of chest pain and heart murmur. On coronary angiography, the diagnosis was made as a coronary artery fistula originating from the left anterior descending artery and draining into the pulmonary artery. The operation was indicated by the fact that the combination with giant saccular aneurysm and positive findings of ischemic changes on exercise electrocardiogram. Intraoperative flowmetry on the fistula revealed that estimated average flow was 200 ml/min and the coronary steal phenomenon was strongly suggested. We concluded that surgical treatment for coronary fistula with giant aneurysm can be done with minimal risk.

Aged↗
PubMed1988

Differentiation in vitro of T3+ large granular lymphocytes with characteristic cytotoxic activity from an isolated hematopoietic progenitor colony.

Blast colonies were developed by rIL-3 from the spleen cells of mice pretreated with 5-fluorouracil (5-FU) in the methylcellulose cultures. When such IL-3-induced blast colonies were individually lifted up and recultured in the presence of rIL-3 and recombinant erythropoietin (rEpo), a variety of hematopoietic colonies developed from every single colony, including neutrophils, macrophages, eosinophils, megakaryocytes, mast cells, and erythroblasts. The results indicated that IL-3-induced blast colonies consisted of multipotential hematopoietic progenitor cells. By culturing individual IL-3-induced blast colonies in the presence of rIL-2 and irradiated peritoneal macrophages, on the other hand, the proliferation of homogeneous lymphoid cells was observed in 5 of 24 wells, each of which received a single blast colony. Morphologically, they were typical large granular lymphocytes (LGL), and thus it was indicated that LGL could be differentiated directly from the hematopoietic progenitor cells utterly in vitro by rIL-2 and accessory macrophages. From one of these culture wells, a continuous LGL line, IL3B1, was successfully obtained. The proliferation of IL3B1 was dependent on IL-2 in the presence of accessory macrophages, but they no longer responded to IL-3, nor to another T cell growth factor, IL-4. Flow cytometric analysis indicated that the phenotype of IL3B1 was Thy-1+,T3+,L3T4-,Lyt-2-,T200+ Asialo GM1+, whereas that of original IL-3-induced blast cells was Thy-1+,T3-,L3T4-,Lyt-2-,B220-. The results suggested that the expression of T3 molecules was induced in the process of LGL differentiation from the hematopoietic progenitor cells in vitro. Conforming to this, it was revealed that both gamma and beta chain genes of the TCR were rearranged in IL3B1. Northern blot analysis indicated that IL3B1 had abundant mRNA for gamma chain, while mRNA for beta chain was rather faint. Functionally, IL3B1 exhibited typical NK-patterned cytotoxic activity against a panel of tumor cell targets. In addition, they showed significant cytotoxic activity against normal bone marrow cells, as well as various factor-dependent myelogenous progenitor cell lines, all of which were resistant to endogenous NK activity of the fresh spleen cells. These results indicated that at least a set of T3+ LGL with rearranged TCR genes could be directly differentiated from isolated hematopoietic progenitor cells in vitro. Results also suggested that such a prethymically differentiated subset of T-lineage lymphocytes, namely T3+ double-negative LGL, had particular cytotoxic activity in addition to conventional NK activity, which might well contribute to feedback regulation of hematopoiesis.

Animals↗
PubMed1988

Surgical treatment of coronary aneurysm developed after PTCA.

Two patients who developed coronary aneurysm at the site of Percutaneous Transluminal Coronary Angioplasty (PTCA) in proximal LAD accompanied by severe re-stenosis just proximal to the aneurysm are described. Both patients underwent Coronary Arterial Bypass Grafting (CABG) to distal LAD to stop anginal attacks refractory to any anti-anginal drugs and to prevent a rupture of a coronary aneurysm. After the operation the anginal attacks disappeared and no trace of coronary aneurysm was visible in the coronary angiogram.

Angioplasty, Balloon↗
PubMed1988

Immunological abnormalities in human interleukin-2 or interleukin-2/interleukin-2 receptor L chain transgenic mice.

We constructed two strains of transgenic mice that carry the cDNA of either human interleukin-2 (IL-2) or the L chain of its receptor under the control of the H-2Kd promoter. The IL-2 transgenic mice expressed human IL-2 mRNA in the thymus, spleen, bone marrow, lung, muscle, and skin. Human IL-2 protein was also detected in their sera. The IL-2 transgenic mice suffered from dermatitis and pneumonia. Immune responses of their spleen cells against antigens were significantly impaired whereas their spleen cells responded well to polyclonal lymphocyte activators, suggesting that constitutive expression of IL-2 might have affected the repertoire formation of T cells in the mice. The IL-2 receptor (IL-2R) transgenic mice were healthy. We crossed the IL-2 and IL-2R transgenic mice to yield hybrid mice expressing both the ligand and the receptor constitutively. The life span of the hybrid mice was remarkably shortened. In addition to several abnormalities found in the IL-2 transgenic mice, spleen cells of the hybrid mice showed the strong natural killer activity which was ascribed to a large number (18%) of Thy-1+/CD3-cells unique to their spleen.

Animals↗
PubMed1988

[Operative results of acquired valvular disease with blood cardioplegia followed by terminal cardioplegia].

Cold blood cardioplegia followed by terminal cardioplegia was employed as a method of myocardial protection for acquired valvular disease. Postoperative clinical results of both cardiac iso-enzyme and cardiac function were discussed from the effect of the myocardial protection. In operative procedures of 62 cases, 30 cases underwent mitral valve replacement and other mitral repair, 17 cases aortic valve replacement, 10 cases double valve replacement and 5 cases modified Bentall operation. Iso-enzymes of Creatine-Kinase (CK) and Lactate-Dehydrogenase (LDH) were measured by the constant time-interval. Cardiac function was estimated in acute postoperative phase and late phase. Hospital mortality was 1.5%. The cause of death was thought to be postoperative Graft Versus Host Disease with skin rash and pancytopenia. Cardiac function during acute phase well recovered in 62 cases of which two cases were controlled with intra-aortic balloon pumping. The values of CK-MB were measured during aortic cross-clamp, 30 min, 3 hours, 6 hours and 24 hours after cross-clamp release. Peak CK-MB value was detected 3 hours or 6 hours in almost cases. In contrast, peak LDH-1 value was detected 24 hours after cross-clamp release. Perioperative myocardial infarction was occurred in one case with modified Bentall operation whose CK-MB value was elevated over 150 IU/L at 3rd hour and 24th hour. However, the cardiac radio-isotope data of this case revealed good cardiac function with left ventricular ejection fraction (LVEF) 76% by cardiac pool imaging in spite of small postero-lateral perfusion defect by Thallium 201 scintigram.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1987

Generation of continuous large granular lymphocyte lines by interleukin 2 from the spleen cells of mice infected with Moloney leukemia virus. Involvement of interleukin 3.

Continuous cell lines could be reproducibly established by culturing spleen cells from adult mice injected with MLV-producer cells or directly infected with Mo-MLV with rIL-2, whereas the culture of normal splenic cells with rIL-2 induced only transient and limited proliferation resulting in no such lines. All of the lines showed morphological characteristics as LGL with Thy-1+,Lyt-1-,L3T4-,Lyt-2-,AsGM1+,FcR gamma+ phenotype without exception, and most of them exhibited typical NK-patterned cytotoxicity. Analysis of reverse transcriptase activity of the culture supernatants as well as Southern hybridization of the DNA from the lines using an Mo-MLV-specific cDNA probe indicated no evidence of retroviral replication or proviral integration, suggesting that the generation of cell lines reflected a reactive process and viral infection was not directly responsible. It was subsequently revealed that Thy-1+,Lyt-1+,Lyt-2- spleen cells from mice infected with Mo-MLV in vivo spontaneously produced surprising amounts of IL-3 in vitro, leading to the possibility that IL-3 was responsible for the generation of lines. The possibility was directly supported by the observation that continuous lines with identical characteristics could be generated completely in vitro by sequential stimulation with rIL-3 and rIL-2 from normal spleen cells without any involvement of Mo-MLV. The C beta gene of TCR was shown to be rearranged in all the lines examined, indicating the LGL lines were all genetically committed to T cell lineage. Unlike the situation in normal splenic populations expanded by rIL-2, where the expression of IL-2-R was progressively lost, constitutive expression of high-affinity-IL-2-R was observed in all the lines and thus, this was considered to explain the unlimited proliferation of them in response to rIL-2 alone. These results suggested the probable role of IL-3 in the regulation of growth and differentiation of a set of LGL committed to T cell lineage. The possible implications of the phenomenon in the regulation of hematopoiesis as well as in the control of Mo-MLV-induced leukemogenesis were discussed.

Animals↗
PubMed1987

Selective impairment of alpha-interferon-mediated natural killer augmentation in Sjögren's syndrome: differential effects of alpha-interferon, gamma-interferon, and interleukin 2 on cytolytic activity.

Natural killer (NK) function has been shown to be impaired in several autoimmune diseases including Sjögren's syndrome (SS). In the present study, in vitro effects of alpha-interferon (alpha-IFN), gamma-IFN and interleukin 2 (IL-2) on the NK cell activity were examined to analyse the regulatory system of NK-augmentation in patients with SS. The responsiveness of NK cell activity to alpha-IFN was markedly depressed in SS patients compared with normal controls, whereas the responsiveness to gamma-IFN was within normal limits. This is the first demonstration of the selective hyporesponsiveness of NK cell activity to one type of IFN in a certain disease. In addition, the kinetics study of NK-augmentation in normal donors revealed that alpha-IFN enhanced NK cell activity with a faster profile than gamma-IFN. These findings imply substantial differences between the two types of IFN in their mechanisms for enhancing NK cell activity, which deserve attention in evaluating the effects of IFNs. The present study also demonstrated that IL-2 could induce significantly higher levels of NK cell activity than alpha-IFN or gamma-IFN in SS and that this enhancing effect was almost comparable to that in normal controls. Thus, there seem to be multiple regulatory mechanisms for enhancement of NK cell activity, and a portion of the mechanisms may be selectively impaired in certain human diseases such as SS. The selective hyporesponsiveness to alpha-IFN could be relevant to the idea of viral participation in pathogenesis of SS.

Cytotoxicity, Immunologic↗
PubMed1987

In vivo distribution of recombinant interleukin-2-activated autologous lymphocytes administered by intra-arterial infusion in patients with renal cell carcinoma.

Recombinant interleukin-2 (RIL 2)-activated autologous peripheral blood lymphocytes (PBL) were infused directly into the renal arteries of 3 patients with renal cell carcinoma, and the in vivo distribution of the infused cells was investigated. In vitro studies to define the optimal culture conditions indicated that maximal lymphokine-activated killer activity was observed at around 10-20 days in culture, as judged by the cytotoxicity against fresh allogenic tumor cells. Maximal expression of the interleukin-2 receptor was also obtained at around 10 days. PBL collected by leukopheresis from each patient were thus cultured for 10 days with RIL 2, labeled with 111In-oxine, and then infused directly into the renal artery of the affected kidney via a catheter. Radioactivity in the infused side of the kidneys increased immediately after the infusion but then gradually decreased. Radioactivity in the lungs also rapidly increased within the first hour but then cleared gradually, whereas that in the liver and spleen tended to increase steadily. Nevertheless, at 48 hours, the infused side of the kidneys retained levels of radioactivity comparable to those seen in the liver and spleen, while the levels seen in the lungs were already close to background levels. The radioactivity in the areas corresponding to tumors remained consistently higher than that in the normal parts of the affected kidneys. The direct comparison of the radioactivity distribution pattern with the macroscopic appearance of surgically resected kidneys indicated that the accumulation of radioactivity was indeed selectively associated with the tumor tissues in the kidneys, except for a case in which the tumor was quite necrotic and hypovascular. Histological examinations indicated intensive mononuclear cell infiltrations in and around the tumor tissues as well as in normal tissues in the kidneys. These preliminary results indicated that infusion of activated lymphocytes via major tumor-feeding arteries would be an extremely effective way to obtain the selective localization of effector cells in the tumor tissues.

Aged↗