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Biomedical subjects

H Noguchi

Publications and source records attributed to H Noguchi.

At least 199 records · Page 11Linked to original sources

[A case report of tracheal stenosis due to true aortic arch aneurysm of retroesophageal right aortic arch associated with so called vascular ring-facial syndrome].

A 63-year-old man admitted to our hospital because of dyspnea and inspiratory stridor. The X-ray computed tomography and angiogram revealed tracheal stenosis due to compression by aortic arch aneurysm of retroesophageal right aortic arch. His face was congenitally asymmetrical, and he also showed anotia, and meatal atresia. In the operation, we approached the aneurysm via median sternotomy and left thoracotomy by the 3rd intercostal space, and found atretic left aortic arch in front of trachea. So, operative diagnosis was Edwards Ib complete vascular ring associated with right aortic arch aneurysm. The aneurysm was incised and the arch and its branches were reconstructed with vascular prosthesis under ECC using selective cerebral perfusion. Postoperatively, until 5th postoperative day his condition was uneventful, and he was neurologically almost normal. But on the 5th postoperative day, his hemodynamics suddenly deteriorated because of severe pneumonia and septicemia. On the 6th postoperative day, he died in spite of earnest resuscitation. We could not find any previous reports about this rare combination of diseases.

Abnormalities, Multiple↗

[A case of simultaneous treatment with mitral valve replacement and aorto-coronary bypass grafting of hypertrophic obstructive cardiomyopathy and coronary artery disease].

A case of surgical treatment of coexistent hypertrophic obstructive cardiomyopathy (HOCM) and coronary artery disease (CAD) in a 65-year-old male patient is reported. He had been diagnosed as HOCM and treated conservatively with beta-blocker and Ca-antagonist, but his complaints of chest oppression and palpitation had increased. Echocardiography revealed a systolic anterior motion of the mitral valve and mitral regurgitation. Cardiac catheterization showed a severe mitral regurgitation and peak systolic pressure gradient of 35 mmHg between the left ventricular and systemic artery. In addition, selective coronary angiography demonstrated a 99% stenosis in segment 7. He underwent aortocoronary bypass grafting and concomitant mitral valve replacement, and marked symptomatic and hemodynamic benefit could be achieved. This case shows the coexistence of HOCM and CAD in the same patient and suggest not only HOCM but also CAD should be routinely examined in the patient with angina, particularly when operative management is contempted. This case further suggests that simultaneous treatment of both diseases is more beneficial than single treatment of CAD or HOCM.

Aged↗

[The hazards of coronary revascularization under hypothermic ventricular fibrillation].

Since January 1992 till June 1994, we experienced 22 cases of coronary revascularization (CABG) under hypothermic ventricular fibrillation (Vf) in patients with unclampable ascending aorta (Group 2). We compared them with patients undergoing conventional CABG with cardioplegic cardiac arrest (Group 1). All these 362 cases were primary isolated CABG. Comparing preoperative patient profile, patients of Group 2 were older (Group 1: 64.3 +/- 8.5, Group 2: 68.2 +/- 6.7 year old, p < 0.05), had more unstable angina (Group 1: 20.3%, Group 2: 54.5%, p < 0.001), and had more severe NYHA classification (Group 1: 2.22 +/- 0.55, Group 2: 2.73 +/- 0.46, p < 0.05) than Group 1. There were no significant difference between both groups about other factors. Comparing post operative complication, low output syndrome (Group 1: 2.6%, Group 2: 18.2%, p < 0.005) perioperative myocardial infarction (PMI) (Group 1: 4.4%, Group 2: 36.4%, p < 0.0001) ventricular tachycardia (VT) (Group 1: 1.4%, Group 2: 18.2%, p < 0.0001), respiratory failure (Group 1: 3.8%, Group 2: 18.2%, p < 0.005), and post operative hospital death (Group 1: 2.9%, Group 2: 18.2%, p < 0.0005) occurred more frequent in Group 2 than Group 1. Other complication (renal failure, wound infection, cerebrovascular accident, rethoracotomy for bleeding) equally occurred in both groups. Long Vf time (mean 92.8 minutes) and low perfusion pressure during Vf (mean 60.0 mmHg) were suspected to be major cause of high incidence of PMI and VT in Group 2. But there were no correlation between Vf time, perfusion pressure and occurrence of PMI and/or VT.(ABSTRACT TRUNCATED AT 250 WORDS)

Age Factors↗

[Risk factors of wound infection following cardiac surgery and antimicrobial prophylaxis].

To make investigation about risk of wound infection following cardiac surgery, we analyzed cases of primary aorto-coronary bypass surgery and/or primary valvular surgery. Cases required respirator for longer than 2 days, and those with drainage tube for longer than 5 days were excluded from this study, because these cases had antimicrobial agent postoperatively as therapeutic use rather than prophylactic use. Those received preoperative antimicrobial agent for infectious endocarditis and so on were also excluded for the same reason. 523 cases were entered this study. These cases received cefazolin (CEZ) postoperatively as prophylaxis. Sternal wound and leg/groin wound were separately analyzed. Risk factors (age, sex, diabetes mellitus, unstable angina, use of intraaortic balloon, internal thoracic artery harvest, re-exploration, previous myocardial infarction, NYHA classification, emergent operation, operation time, extracorporeal circulation time, blood product use, preoperative blood hemoglobin concentration, preoperative serum albumin, preoperative creatinine clearance (Ccr), duration of drainage tube insertion, body surface area, daily dose of CEZ, duration of prophylaxis) were examined using univariate (Chi square test was used for contingency table analysis, unpaired t test was used to compare averages) and multiple regression analysis. For sternal wound infection, only Ccr showed significant (P = 0.027) correlation. For leg/groin wound infection, 2 factors (smaller daily dose of CEZ: P = 0.009, more severe NYHA class: P = 0.03) showed significant correlation. To investigate appropriate duration of CEZ prophylaxis, cases were divided into 2 groups, those had CEZ within 48 hours postoperatively (group S) and those had CEZ for longer than 48 hours (group L).(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗

[Clinical study of the reliability of monitoring ESP during descending thoracic aortic surgery].

We studied the reliability of monitoring ESP to detect paraplegia due to spinal cord ischemia during thoracic aortic cross-clamping. In eleven patients with descending thoracic aortic aneurysm, we observed the relationship between the ESP change and postoperative paraplegia. Two patients with loss of ESP had normal postoperative neurological function but one of seven patients with low ESP amplitudes (47% of the control value) showed postoperative paraplegia with anterior spinal artery syndrome. Monitoring ESP dose not appear to be reliable to detect paraplegia during cross-clamping of the descending thoracic aorta.

Aged↗

[Surgical treatment of aortic rupture by blunt chest trauma].

During a ten-year period, seven patients with traumatic rupture of the thoracic aorta were operated upon. Four patients of them were operated within one week. Chest X-rays and chest computed tomography could not always reveal the exact diagnosis of aortic rupture. Intravenous digital subtraction angiography was useful to confirm the diagnosis. The repair of the rupture was accomplished with the adjunct of left heart bypass using Bio-pump, which was useful to reduce the bloodloss with a limited systemic heparinization. Another three patients were diagnosed to have chronic post-traumatic aneurysm of the thoracic aorta and underwent aortic replacement with prosthetic graft. One of seven patients died at seventh postoperative day because of cerebral contusion, the associated lesion of an automobile accident. It is stated that the aortic rupture is immediately fatal in approximately 80% of individuals, and most of remaining 20% die within 2 weeks unless the lesion is repaired. Therefore immediate operative intervention is recommended when the aortic rupture is strongly suspected. Chronic post-traumatic aneurysms should be resected because it has become apparent that the majority of patients with this lesion will develop complication, such as sudden rupture.

Adolescent↗

Epitopes for human monoclonal antibodies and serotyping antisera against the O-specific polysaccharide of Pseudomonas aeruginosa O11.

Epitopes for Pseudomonas aeruginosa O11-specific human monoclonal antibodies (mAbs) and O11 serotyping antisera have been characterized. These mAbs recognized the O-polysaccharide portion of the lipopolysaccharide. The structure of the O-polysaccharide of O11 has been reported to be comprised of trisaccharide repeating-units as follows: -->3)-alpha-L-FucpNAc-(1-->1)-beta-D-FucpNAc-(1--> 2)-beta-D-Glcp-(1-->. (FucpNAc, 2-acetamido-2,6-dideoxygalactopyranoside.) Data from inhibition studies of binding in enzyme-linked immunosorbent assays and cell-agglutination assays, using monosaccharides and periodate-oxidized O-polysaccharide showed that the glucose residue, especially the C-3-C-6 segment and the beta-anomeric configuration, in the polysaccharide is essential for the epitopes of all anti-O11 mAbs; however, the detailed epitope specificities were different from one another. Furthermore, epitopes for serotyping antisera of O11 seemed to be similar to those for the human mAbs.

Agglutination↗

The significance of glutathione peroxidase on myocardial protection in the rat hearts: the key of clarify the cause of vulnerability to reperfusion injury in infantile cardiac operations.

Selenium (Se) is an integral component of glutathione poeroxidase (GSHPx), and the serum selenium concentration is age-depend. We speculated that myocardial GSHPx had relation to reperfusion injury in open heart operations, especially in infants in whom GSHPx activity is low. This study correlated GSHPx activity with the serum and myocardial selenium concentrations in Wistar rats, which were divided into three groups, infants, Se-deficient rats, and control rats. Serum GSHPx activity in infant and Se-deficient rats (22.7 +/- 3.5 U/g protein, 24.6 +/- 22.2 U/g protein) was lower than that in controls (179 +/- 12.0 U/g protein). The serum selenium concentration in infant and Se-deficient rats (3.81 +/- 0.81 micrograms/g protein, 2.06 +/- 1.69 micrograms/g protein) was also lower than that in controls (7.32 +/- 2.96 micrograms/g protein). The myocardial GSHPx activity was significantly lower in infants and Se-deficient rats (4.76 +/- 1.05 x 10(-1) U/mg protein, 3.38 +/- 0.32 x 10(-1) U/mg protein) than that in controls (8.03 +/- 0.57 x 10(-1) U/mg protein). However, the myocardial selenium concentration in infants (1.42 +/- 0.24 x 10(-1) micrograms/mg protein) was significantly higher than that in the other groups (0.31 +/- 0.06 x 10(-1) micrograms/mg protein, 0.28 +/- 0.04 x 10(-1) micrograms/mg protein). Next, in Se-deficient and control rats, isolated hearts were perfused for aerobically with Krebs-Henseleit solution in the Langendorff mode for 15 minutes, followed by 60 minutes of global ischemia at 4 degrees C and then reperfused for 30 minutes in a working mode. The hemodynamic parameters were measured.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗

Application of 13C NMR spectroscopy to paratope mapping for larger antigen-Fab complexes.

For the purpose of engineering the antibody combining site, mapping residues that are involved in antigen binding provide us with valuable information. By use of 13C NMR spectroscopy with selectively 13C-labeled Fv fragments, we have established a general strategy to identify the residues that are perturbed upon binding of small antigen (hapten) molecules [(1990) Biochemistry 30, 6604-6610]. In the present paper, we demonstrate that this strategy can be extended to molecular structural analyses of the complexes of an Fab fragment and a larger antigen molecule such as Pseudomonas aeruginosa exotoxin A with a molecular mass of 67 kDa.

ADP Ribose Transferases↗

Molecular cloning of a human transmembrane-type protein tyrosine phosphatase and its expression in gastrointestinal cancers.

To determine the expression of various protein-tyrosine phosphatases (PTPs) in human gastric cancers, cDNAs encoding conserved PTP domains were amplified by reverse transcriptase polymerase chain reaction from KATO-III cell mRNA and sequenced. Among 72 polymerase chain reaction clones, one of the cDNA sequences encoded a novel potential PTP (stomach cancer-associated PTP, SAP-1). The full length (3.9 kilobases) of the SAP-1 cDNA was further isolated from the KATO-III cell cDNA library and the WiDr cell cDNA library. The predicted amino acid sequence of the SAP-1 cDNA showed that mature SAP-1 consisted of 1093 amino acids and a transmembrane-type PTP, which possessed a single PTP-conserved domain in the cytoplasmic region. The extracellular region of SAP-1 consisted of eight fibronectin type III-like structure repeats and contained multiple N-glycosylation sites. These data suggest that SAP-1 is structurally similar to HPTP beta and that SAP-1 and HPTP beta represent a subfamily of transmembrane-type PTPs. SAP-1 was mainly expressed in brain and liver and at a lower level in heart and stomach as a 4.2-kilobase mRNA, but it was not detected in pancreas or colon. In contrast, among cancer cell lines tested, SAP-1 was highly expressed in pancreatic and colorectal cancer cells. The bacterially expressed SAP-1 fusion protein had tyrosine-specific phosphatase activity. Immunoblotting with anti-SAP-1 antibody showed that SAP-1 is a 200-kDa protein. In addition, transient transfection of SAP-1 cDNA to COS cells resulted in the predominant expression of a 200-kDa protein recognized by anti-SAP-1 antibody. SAP-1 is mapped to chromosome 19 region q13.4 and might be related to carcinoembryonic antigen mapped to 19q13.2.

Amino Acid Sequence↗

A case of ovarian cancer with metastasis to the sternum and costae.

This report describes a case of ovarian cancer with metastases to the sternum and costae. Sternal and costal metastases from ovarian cancer are extremely rare. We introduce a case of sternal metastasis from ovarian cancer that occurred over 7 years after initial diagnosis which was successfully treated with local resection and systemic chemotherapy. Possible metastatic routes are discussed.

Bone Neoplasms↗

Small hepatocellular carcinoma with intravascular tumor growth into the right atrium.

A 66-year-old man with ascites and marked edema in the lower extremities was suspected of having secondary Budd-Chiari syndrome due to primary liver cancer, based on imaging diagnosis, i.e., ultrasonography, computed tomography, and inferior venacavogram. At autopsy, an encapsulated small liver cancer was found to have extended into the inferior vena cava and right atrium. There have been few reports of small hepatocellular carcinoma with intravascular tumor growth into the right atrium.

Aged↗

Influence of nitroglycerin on portal pressure and gastric mucosal hemodynamics in patients with cirrhosis.

We studied 30 patients with cirrhosis to determine the effect of nitroglycerin on portal and gastric mucosal hemodynamics. Systemic hemodynamics, portal venous pressure (PVP), the hemoglobin index (IHB), and the oxygen saturation index (ISO2) of the gastric mucosa were measured before and after a continuous infusion of nitroglycerin. The patients were divided into two groups according to the presence or absence of major portal-systemic collateral routes on portograms. Nitroglycerin caused a reduction in PVP in all patients. Although there was no significant difference in systemic hemodynamic changes between the two groups, the reduction in PVP in patients with major portal-systemic collaterals was significantly higher than in those without major collaterals. A nitroglycerin infusion, at a dose of 1.0 micrograms/kg per min for 10 min, produced a reduction in both IHB (-16%, P < 0.001) and ISO2 (-13%, P < 0.001) in the gastric mucosa, indicating gastric mucosal ischemia secondary to splanchnic vasoconstriction. These findings suggest that the continuous infusion of nitroglycerin reduces PVP in cirrhotic patients, particularly in those with major portal-systemic collaterals, and reduces the congestion of the gastric mucosa in patients with portal hypertension.

Adult↗

Age- and sex-related changes of sulfotransferase activities in the rat.

Temporal and gender-related changes of sulfotransferase activities in the rat were studied using alcoholic, amine and phenolic compounds as substrates. Alcohol and amine sulfotransferase activities in the rat exhibited different temporal and sex-related changes of those for phenol. Formation of sulfoconjugates in vivo correlated well with in vitro sulfotransferase activities in the rat liver.

Aging↗

Monoclonal antibodies recognizing 2-oxo acid dehydrogenase components in granular structures in neurons.

Monoclonal antibodies (MAbs) were raised against the hippocampal homogenate of young rats and classified into three types by immunohistochemical analysis: (1) MAbs specific for a granular structure observed within neurons, (2) MAbs specific for neuronal cell surface and cell body, and (3) MAbs specific for both neurons and astroglial cells. One MAb (2D11-7) specifically reacted with granular structures observed in neurons. A specific protein antigen was purified from rat homogenate by immunoadsorbent assay with MAb 2D11-7. Amino acid sequencing followed by lysyl endopeptidase digestion of the proteins in the eluate demonstrated that the antigens recognized by MAb 2D11-7 were E2 components of the 2-oxoglutarate dehydrogenase complex and pyruvate dehydrogenase complex. The cell specificity and age dependency of these proteins are also discussed.

3-Methyl-2-Oxobutanoate Dehydrogenase (Lipoamide)↗

Humanization of mouse anti-human IL-2 receptor antibody B-B10.

Mouse monoclonal anti-human IL-2 receptor antibody (B-B10) inhibits IL-2-dependent human T-cell proliferation. It has been used in clinical trials in the transplantation field and promising results are being accumulated. Mouse B-B10 antibody was humanized by grafting all CDRs and some framework amino acid residues onto human antibodies, KAS for VH and PAY for V kappa. Nine humanized B-B10s with differently grafted framework residues were constructed and assessed for their biological activities. One of these humanized B-B10, M5, showed nearly the same activity as the mouse B-B10. The 49th residue of V kappa was demonstrated to play a crucial role in the antigen-antibody interaction by 3-D structure analysis with a computer modeling system.

Amino Acid Sequence↗

Identification of adducts formed by reaction of purine bases with a mutagenic anthraquinone, lucidin: mechanism of mutagenicity by anthraquinones occurring in rubiaceae plants.

A mutagenic anthraquinone, lucidin (1), occurring in Rubiaceae plants, reacted with nucleic bases under physiological conditions to form adducts. The order of the reactivity is as follows: adenine > guanine >> pyrimidine bases approximately 0. By spectroscopic analyses, the isolated purine base adducts were identified as condensed reactants at the benzylic position of 1 with a nitrogen atom of a purine base. The results indicate a strong possibility of the formation of an exomethylenic compound as an electrophile intermediate.

Anthraquinones↗

Change in the contractility of rat atrial muscle by cold preservation.

Cold preservation of isolated mammalian hearts attenuates cardiac contractility. We examined the effect of intracellular and extracellular Ca ion on the contractility of cold-preserved atria of rat. Rat hearts were isolated and stored in Collins' solution at 4 degrees C for either 0 or 12 h. Mechanical responses were then examined in electrically driven left and beating right atrial muscle preparations. When stimulus frequencies were increased stepwise from 0.1 to 3 Hz, the twitch contractions initially decreased (Woodworth phenomenon: WP) and then increased (Bowditch phenomenon: BP) in 0 hour-preserved (fresh) left atrial preparations. However, BP, but not WP, was abolished in 12 hour-preserved preparations. The absence of BP was also observed when fresh preparations were exposed to a low-Ca medium (0.9 mM). Ryanodine (3 x 10(-8) M) abolished the twitch contractions at low stimulus frequencies, but did not inhibit BP in fresh preparations. In 12 hour-preserved preparations, both ryanodine and low-Ca medium completely inhibited the twitch contraction. The positive inotropic effects of isoproterenol in right and left atria were markedly attenuated after 12-hour cold preservation. However, the rate of spontaneous beating and the positive chronotropic effect of isoproterenol in right atria were not changed in the cold-preserved preparations or in fresh preparations that had been treated with ryanodine or exposed to a low-Ca medium. These results clearly show that cold-preserved atrial muscle is more susceptible to changes in intracellular and extracellular Ca ion and suggest that the attenuation of cardiac contractility by cold preservation may be due to the impairment of Ca2+ influx which may result from membrane deterioration.

Animals↗