Search PubMed⌕ Search

Biomedical subjects

Y Ota

Publications and source records attributed to Y Ota.

At least 145 records · Page 8Linked to original sources
PubMed1993

[A case report: multiple liver metastasis of gastric cancer responding to intraarterial infusion of MTX and 5-FU].

In a 63-year-old male patient with gastric cancer having multiple liver metastases, the metastatic lesions responded well to postoperative staggered intraarterial infusion therapy with MTX and 5-FU. The intraarterial infusion therapy was administered once a week. A total of 5 courses of this therapy produced marked regression of liver metastases and remarkable necrosis. The effect was thus rated as PR. The patient is healthy and has been successfully rehabilitated. His dose is oral 5-FU (200 mg x 2).

Adenocarcinoma↗
PubMed1992

Extrathymic origin of V gamma 1/V delta 6 T cells in the skin.

The dendritic epidermal cells (dEC) from young (8-week-old) athymic mice were found to express mRNA for gamma/delta T cell receptors (TcR). The mRNA found in the dEC from athymic mice was expressed only for V gamma 1-J gamma 4-C gamma 4 and V delta 6-J delta 1-C delta with both chains having productive rearrangements and junctional diversity. On the other hand, the dEC from euthymic mice carried V gamma 5-J gamma 1-C gamma 1 and V delta 1-J delta 2-C delta in addition to the V gamma 1/V delta 6 subset found in athymic mice. Therefore, this V gamma 1/V delta 6 subset, which has been implicated in the murine gamma/delta T cell responses to mycobacterial antigens and self heat-shock proteins, is the product of extrathymic maturation in the dEC from both athymic and euthymic mice.

Animals↗
PubMed1992

Antimony electrode for the determination of the intramyocardial pH during open-heart surgery.

The development of an antiomony electrode (Sb) and a pH meter as a substitute for a glass electrode(G) to measure the intramyocardial pH is reported, and the results of their clinical application. The determination of the pH of CPD (citrate-phosphate-dextrose) blood by Sb showed small differences when compared to G (less than 0.1). Sb was also temperature sensitive. The temperature coefficient of Sb was determined in buffers by varying their temperatures, and an antimony-thermocouple electrode and a temperature-compensated pH meter were subsequently constructed. In CPD blood of varying temperatures Sb showed similar tendencies to G. The results of the application of the new apparatus to 28 patients were statistically no different from those obtained previously by G on 22 patients, either in baseline pH or its fall following aortic cross-clamping. It is concluded that although Sb is not as accurate as G, it is a reasonable alternative for the determination of myocardial acidosis during open-heart surgery.

Antimony↗
PubMed1992

Lymphoscintigraphy of head-and-neck cancer.

To achieve the visualization of regional lymph nodes by lymphoscintigraphy, 21 patients with head-and-neck cancer were studied with the aid of 99mTc-labeled rhenium sulfur colloid (99mTc Re). Four injection sites were selected; the injections were given into the subcutaneous tissue of the parietal area of 11 patients, into the submucosa of the retromolar area of 6 patients, into the subcutaneous tissue of the postauricular area of 2 patients, and into the thyroid glands of 2 patients. Lymphoscintigraphy was done three hours after the injection. The cervical regions were visible in 85.7% of the patients on the affected side and in 90.5% on the healthy side. The visualization comprised the following regions: submental, submandibular, deep cervical, accessory, and supraclavicular regions. In total, 102 nodes were visualized on the affected side (average 4.8 per patient) and 110 nodes in the healthy side (average 5.5). Histologically, 15 of 21 patients had lymph nodes metastases and 6 did not. Of these 21 patients, 66.7% (14/21) had confirmed lymph node metastases in the visualized regions. This technique appears to be a relatively easy and efficient method of imaging the regional lymph nodes in head-and-neck cancer both before treatment and after neck surgery.

Aged↗
PubMed1992

[Ventilation and passages in the middle ear. A study by HRCT in patients with attic cholesteatoma].

Operative records of 75 patients with acquired attic cholesteatoma were evaluated and compared with preoperative HRCT findings. The cholesteatoma extensions were classified into five groups as follows; Group 1 (cholesteatoma limited to the attic, 9 cases), Group 2 (cholesteatoma occupying both the attic and the aditus, 5 cases), Group 3 (cholesteatoma extending down to the posterior tympanum, also occupying an area as in Group 2, 6 cases), Group 4 (cholesteatoma occupying the attic, the aditus and the mastoid antrum, 14 cases), and Group 5 (cholesteatoma extending down to the posterior tympanum, also occupying an area as in Group 4, 41 cases). Ventilatory conditions, or the existence of soft tissue density, were evaluated by HRCT at such locations as the supratubal recess, mesotympanum, anterior and posterior parts of the tympanic isthmus, epitympanum, and mastoid antrum. Results are as follows. In Group 1, all these locations were aerated with the exception of a few cases. In Group 2, complete opacification was observed in almost all of the antrums. Soft tissue masses involved the anterior and/or posterior parts of the tympanic isthmus in both Groups 3 and 5. In Group 3, the posterior part of tympanic isthmus was less aerated than the anterior part of tympanic isthmus. In Group 5, all locations were filled with soft tissue density except the supratubal recess and the mesotympanum, where some degree of aeration was observed. These results indicate that blockage of the ventilatory passages is not essential for formation of an attic cholesteatoma. Soft tissue density in HRCT is not the cause, but rather, the result of extension of a cholesteatoma.

Adolescent↗
PubMed1992

Tissue reactions at the implant-bone interface of the cementless total knee prostheses with sinking (Okayama University Mark-II type).

Periprosthetic tissues of 14 revised knees of 11 patients, who had undergone Mark-II type cementless total knee prosthesis, were examined to find the relationship between tissue and sinking. Nine patients had rheumatoid arthritis and two had osteoarthritis. Two types of tissue reactions were observed at the implant-bone interface: 1) granulation-dominant tissue, composed of giant cells and macrophages phagocytizing high density polyethylene flakes and dense granules of metal, on the femoral side in six cases, and tibial side in four, 2) fibrosis-dominant tissue on the tibial side in seven, and femoral side in four. On each type, three zones were observed. In the deep zone adjacent to the bone, hyaline cartilage-like tissue was located on the tibial side in four cases, and femoral side in one. An immunohistochemical stain with S-100 proteins and transmission electron microscopy revealed chondrocyte-like features. Chondrogenesis was more frequently observed on the tibial side.

Aged↗
PubMed1992

[Autogenous pericardial patch augmentation of the anastomotic orifice of Blalock-Taussig shunt].

Our recent experiences of the autogenous pericardial patch augmentation of Blalock-Taussig anastomotic orifice are reported. In Case 1, the direct suture between the left subclavian artery and the left pulmonary artery was difficult on the anterior wall because of the shortness of the left subclavian artery. Therefore, a piece of the patient's own pericardium was excised and sutured anteriorly between the two vessels by interrupted 7-0 polypropylene sutures. A 19 months postoperative angiogram showed so-called parrot-beaking of the subclavian artery probably due to tension, but there was no distortion or stenosis of the pulmonary artery. In Case 2, the right subclavian artery distal to the bifurcation of the vertebral artery was longitudinally split measuring approximately 2.5 cm in length, and widened by a piece of the autogenous pericardium in a wedge shape. Then, it was anastomosed to the right pulmonary artery without undue tension. Seven months postoperatively the patient died from severe AV valve regurgitation. The autopsy showed widely patent anastomosis and good healing as well as slight expansion of the pericardial patch but without aneurysm formation. In Case 3, the same operation as in Case 2 was performed. A 6 months postoperative angiogram showed no stenosis or distortion of either the subclavian or the pulmonary artery. Although it is premature to draw any conclusion, the use of the autogenous pericardium may be indicated to widen the anastomotic orifice of Blalock-Taussig shunt without sacrificing the length of the subclavian artery even in small infants or neonates.

Anastomosis, Surgical↗
PubMed1992

[Aortic dissection associated with Turner's syndrome].

We report two cases of Turner's syndrome who had had coarctation repair and who ultimately died from complications believed to be associated with Turner's stigmata. Case 1. The repair of coarctation of the aorta (Co/Ao) at age 5 was associated with the tear of the aortic wall and an Asc. Ao-Desc. Ao bypass together with the closure of the Ao proximal to the Co/Ao was performed. At age 10, she developed a dissecting aneurysm of the Asc. Ao seemingly unrelated to the previous surgery and the Asc. Ao was replaced by a prosthetic tube graft. Pathological diagnosis was cystic medionecrosis. The aortic valve was bicuspid. Subsequently, the patient showed progressive worsening of the aortic regurgitation. The aortic valve replacement at age 14 was complicated by significant bleeding and the patient died on the fifth postoperative day. Case 2. Co/Ao was repaired at age 8. During the operation, the aortic wall appeared to be thin and friable, and there was some tear of the posterior suture line which necessitated reanastomosis with resultant stenosis. At age 9, stenotic area was enlarged by an onlay-patch of a piece of woven Dacron arterial graft. There was gradual swelling of that area on routine x-ray examinations and an aortography at age 16 showed definite aneurysm formation. At age 18, she suddenly developed hemoptysis. Rupture of the aneurysm into the pleural cavity and the left lung was suspected. An emergency surgery to stop bleeding under hypothermic cardiopulmonary bypass was unsuccessful and the patient died in OR.(ABSTRACT TRUNCATED AT 250 WORDS)

Aortic Dissection↗
PubMed1991

High-level secretion of the extracellular domain of the human growth hormone receptor using a baculovirus system.

A chemically synthesized gene (hGHR-ED) coding for the extracellular domain (ED) of the human growth hormone (hGH) receptor (hGHR) was inserted into the genome of Autographa californica nuclear polyhedrosis virus adjacent to the polyhedrin promoter. Spodoptera frugiperda cells infected with the recombinant virus secreted a protein with hGH-binding activity into the medium. The secreted 35-kDa protein was purified to near homogeneity. The purified protein exhibited a high binding affinity (Kd = 0.2-0.3 nM) to hGH. The highest cell production capability was estimated at more than 10-20 micrograms hGHR-ED/ml of culture. The inhibition of the hGHR-ED secretion by treatment with tunicamycin suggests that glycosylation is important for secretion.

Amino Acid Sequence↗
PubMed1991

Detection of platelet mitochondrial DNA deletions in Kearns-Sayre syndrome.

To establish a noninvasive genetic diagnosing method for Kearns-Sayre syndrome, the authors used the polymerase chain reaction (PCR) technique for detecting mitochondrial DNA (mtDNA) deletions in the platelets and directly sequenced the crossover regions of the deleted mtDNA using the fluorescence-based automated sequencing system. The mtDNA deletions were identified in the platelets of three of four patients. The sizes and locations of deletions were determined by the nesting primer PCR method, in which the primary PCR products derived from deleted mtDNAs undergo reamplification using a series of nesting primers. With the fluorescence-based sequencing of templates amplified by the asymmetric PCR method, deleted mtDNA was sequenced directly without cloning. In patient 1, guanine (G) was found at the boundaries of a deleted segment spanning 8400 base pairs (bp) between the CO1 and ND6 genes. In patient 2, a 9-bp directly repeated sequence of 5'-ACCTCCCTC-3' (where A = adenine, C = cytosine, and T = thymine) was found at the boundaries of a deleted segment spanning 7221 bp between the CO1 and ND5 genes. In patient 3, an 8-bp sequence of 5'-TCGCTGTC-3' was found at the boundaries of a deleted segment spanning 4664 bp between the ATPase6 and ND5 genes. Deletions were not detected in the mtDNA of patient 4 or in that of the mothers of the patients. Previously, the genetic diagnosis of this syndrome required muscle biopsy specimens and the use of Southern blot analysis. However, this method requires neither muscle biopsy nor isotopes and is more rapid than the Southern blot method.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1991

[Detection of deletions in platelet mitochondrial DNA in Kearns-Sayre syndrome using polymerase chain reaction].

Kearns-Sayre syndrome has been genetically diagnosed by detecting deleted mitochondrial DNA in muscle biopsy specimen using the Southern blot method. However, deleted mitochondrial DNA cannot be detected in the blood by this method. With the limited availability of muscle biopsy specimens in mind, we attempted to establish a noninvasive genetic diagnostic method for this syndrome. The polymerase chain reaction (PCR) was employed for detecting mitochondrial DNA deletions in platelets at levels below the sensitivity of Southern blotting. We selected several pairs of oligonucleotide primers, considering the regions of predilection for deletion in this syndrome, and identified mitochondrial DNA deletions in platelets in three of four patients. The size and the locations of the deletions were determined by the nesting primer PCR method, in which the primary PCR products derived from deleted mitochondrial DNAs were subjected for reamplification using a series of nesting primers. By this method, it was possible to determine whether the products retained a complementary site for each primer. Patient 1 had an 8.3-kb deletion starting within the CO1 gene and ending within the Cyt b gene. Patient 2 had a 7.2-kb deletion starting within the CO1 gene and ending within the ND5 gene. Patient 3 had a 4.7-kb deletion starting within the ATPase6 or the CO3 gene and ending within the ND5 gene. Deletions were detected neither in Patient 4 nor in three mothers of four patients. These results indicate that the present method is useful for noninvasive genetic diagnosis of Kearns-Sayre syndrome.

Adolescent↗
PubMed1991

[The development of an antimony electrode with a built-in thermocouple and a temperature-compensated pH meter for the determination of intramyocardial pH during open-heart surgery].

Myocardial acidosis as reflected in pH measured by a glass (G) electrode during ischemic arrest may adversely affect postoperative cardiac function. However, (G) is slow in response and fragile. We report the development of an antimony electrode (Sb) and a pH meter based on our investigation and the results of their clinical application. As a biological material, CPD blood was chosen and subjected to a series of experiments determine its pH by (Sb) and (G). There was a small (within 0.1), but statistically significant difference in pH between (Sb) and (G). To simulate myocardial cooling during operation, CPD blood was cooled and its pH measured by (Sb) and (G). (Sb) showed significantly different behaviour from (G), i,e, the pH tended to fall with the falling temperature, whereas with (G) it tended to rise as had been previously known. The thermodynamic property of (Sb) was checked in appropriate buffer solutions by varying their temperatures. There was an almost linear correlation between EMF by (Sb) and the temperature of the buffer solutions (1 mV/1 degree C, or 0.017 pH/1 degree C). Accordingly, a pH meter incorporating an electronic circuit compensating for the temperature-depending EMF and a (Sb) with a built-in-thermocouple were constructed. Utilizing the new apparatus, CPD blood was again tested and it was proved that the new electrode and the pH meter worked in similar manner to (G). The new apparatus was applied to a series of measurement of intramyocardial pH during open-heart surgery and the results compared with that previously obtained by (G). There were no significant differences either between control pH or rate of its fall in the initial 10 minutes. following aortic cross-clamping and the administration of the cardioplegic solution. It is concluded that although (Sb) is not as accurate as (G), it is a reasonable alternative for the determination of the intramyocardial pH during open-heart surgery.

Cardiac Surgical Procedures↗
PubMed1991

[A successful surgical treatment of cor triatriatum with VSD, PDA and CoA].

A successful repair of cor triatriatum with VSD, PDA and CoA is reported. A two-month-old boy was admitted for evaluation of growth failure and cyanosis. Physical examination on admission revealed systolic murmurs at left sternal border. Chest X-ray showed increased pulmonary vascularities without cardiomegaly. Echocardiography showed abnormal wall in left atrium with VSD, PDA and CoA. An emergency operation consisting of patch closure of VSD, ligation of PDA and resection of the anomalous left atrial membrane were performed. At postoperative course, an episode of pulmonary hypertension crisis happened. But the patient tolerated this episode and survived.

Aortic Coarctation↗
PubMed1991

[Effect of steroids on postoperative pain and pyrexia].

Effect of steroid (Solucortef or Solumedrol) 1g on postoperative pain and pyrexia was investigated in 103 patients after total hip joint or knee joint replacement. In control group without intraoperative steroid administration, 95.0% of the patients suffered postoperative pain, but in group with intraoperative steroid administration, postoperative pain was observed in 33.3% of patients. Supplemental administration of dichlofenac sodium 50 mg could not reduce postoperative pain. Intraoperative administration of a large dose of steroid was also effective in relieving postoperative pyrexia.

Aged↗
PubMed1990

Expression and function of a 90-kilodalton homodimeric molecule (10D1 antigen) on human thymocytes.

The 10D1 Ag is a 90-kDa homodimeric molecule specifically expressed on a subpopulation of human T cells, and is involved in an alternative pathway of T cell activation. In the present study, we have examined the expression and function of the 10D1 Ag on human thymocytes. Three-color FMF analysis showed that the 10D1 Ag was highly expressed on minor but distinct subpopulations of double-negative and CD4 single-positive thymocytes, and weakly on a part of double-positive thymocytes, but not on CD8 single-positive thymocytes. In double-negative thymocytes, the vast majority of 10D1+ cells were immature thymocytes of CD7+2+3- phenotype. Interestingly, 10D1 mAb could induce the proliferation of CD4 single-positive thymocytes in the presence of goat anti-mouse Ig to cross-link the 10D1 Ag. The treatment of thymocytes with OKT4 mAb plus C but not with OKT8 mAb plus C totally abrogated the proliferative response induced by 10D1 mAb, indicating that the 10D1-responsible thymocytes were of CD4+8- phenotype. This 10D1 mAb-induced thymocyte proliferation was perfectly dependent on the endogenous IL-2/IL-2R system since a complete inhibition was observed with anti-IL-2 and anti-IL-2R mAb. The proliferating CD4 single positive thymocytes predominantly expressed the IL-2R alpha (p55) but not a detectable level of the IL-2R beta (p75). These results indicate that, although the 10D1 Ag can be detected on the CD7+2+3-4-8- thymocytes, its functional expression is restricted to a minor more mature CD4+ thymocyte population as well as in peripheral blood T cells, and the implications of these findings are discussed.

Antibodies, Monoclonal↗