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Biomedical subjects

M Kanno

Publications and source records attributed to M Kanno.

At least 163 records · Page 9Linked to original sources

[A successful repair of ventricular septal defect and patient ductus arteriosus associated with pulmonary hypertension in an infant with left lung agenesis].

We report the first case of successful repair of ventricular septal defect (VSD) and patent ductus arteriosus (PDA) associated with pulmonary hypertension in an infant with left lung agenesis. A 70-days-old infant was referred to our hospital with the diagnosis of congenital heart disease and abnormalities of the left lung. Two-dimensional echocardiogram showed ventricular septal defect and patent ductus arteriosus associated with pulmonary hypertension. Computed tomogram of the chest and bronchogram confirmed agenesis of the left lung. The operation was performed at age 114 days with the body weight 4333 g. VSD was closed with the patch and PDA was ligated under cardiopulmonary bypass. Postoperative course was uneventful. Cardiac catheterization, 50 days after operation, revealed normal pulmonary arterial pressure and good cardiac function. Agenesis of the lung is a rare condition and often associated with congenital abnormalities of the skeletal, gastrointestinal, genitourinary and cardiovascular system. As the prognosis is poor especially in those with congenital heart disease, the cardiac surgery is mandatory for the patient to survive.

Abnormalities, Multiple↗

Reappraisal of preoperative carcinoembryonic antigen levels as a prognostic factor in resectable colorectal cancer.

Preoperative carcinoembryonic antigen levels in sera were measured in 124 cases of primary colorectal cancer, and their usefulness as a prognostic factor were evaluated. There were no significant differences in the CEA levels with regard to age, sex, size of the primary tumor, histological differentiation, peritoneal dissemination or DNA ploidy, but CEA levels were significantly higher in patients with liver metastasis. By using Cox proportional hazard model, the most significant discriminant in prognosis was liver metastasis, followed by preoperative CEA level, depth of invasion and DNA ploidy pattern. Preoperative CEA measurements were applied as a parameter of biological behavior of colorectal cancer in the follow-up course.

Adult↗

Pertussis toxin pretreatment alters agonist binding to beta-adrenoceptors in rabbit ventricular myocardium.

The influence of pretreatment with pertussis toxin (PTX) on characteristics of beta-adrenoceptor bindings was examined in myocardial ventricular membranes prepared from rabbits which received an intravenous injection of PTX (10 micrograms/kg) or its vehicle. The density and affinity of beta-adrenoceptors assessed by (-)-[125I]iodocyanopindolol were not significantly altered by PTX pretreatment. However, a fraction of agonist binding sites with high affinity significantly increased in PTX-pretreated myocardial membranes. In the presence of 100 microM 5'-guanylyl imidodiphosphate, all agonist binding sites were converted to low-affinity sites in both control and PTX-pretreated membranes. The results suggest that Gi might regulate negatively coupling of beta-adrenoceptors to Gs.

Animals↗

[Basic studies on combination effects of arbekacin and beta-lactam antibiotics on methicillin-resistant Staphylococcus aureus].

Combination effects were studied with arbekacin (ABK) and beta-lactam antibiotics including imipenem/cilastatin (IPM/CS), flomoxef (FMOX), and cefotiam (CTM) for bactericidal activities, post-antibiotic effects (PAE's) and bactericidal activities of beta-lactam antibiotics after removal of ABK using methicillin-resistant Staphylococcus aureus (MRSA) strain 1936. The following results were obtained. 1. When ABK was administered in combination with IPM/CS, FMOX or CTM against MRSA strain 1936, low FIC index was not obtained. 2. Higher bactericidal activity was observed when ABK was given before beta-lactam than when beta-lactam was given before ABK. 3. Combination of ABK and each of beta-lactam antibiotic led a longer PAE than ABK alone. 4. When each beta-lactam antibiotic was administered after a treatment and removal of ABK, greater bactericidal activity and growth inhibition were observed than when administered each beta-lactam alone. These findings basically demonstrated that ABK was effectively bactericidal against MRSA when administered in combination with beta-lactam antibiotic such as IPM/CS, FMOX or CTM, even when the FIC index did not indicate a favorable effect.

Aminoglycosides↗

[Coronary artery spasm after mitral valve replacement: a case report].

A 50-year-old female with a malfunctioning bioprosthetic mitral valve which was implanted 7 years earlier underwent reoperation. She had no history of angina pectoris. Calcium channel blockers and nitrates had not been taken by the patient. Coronary arteriograms were normal. About 2 hours after the reoperation, EKG monitor showed abrupt ST segment elevation which was immediately followed by ventricular tachycardias and fibrillations. This life threatening circulatory collapse recurred until a drip infusion of diltiazem was started. Maximum CPK-MB was 145 IU/l. Postoperative coronary arteriography, which was performed after 12 hours of withhold of diltiazem, showed a spasm in the proximal segment of the right coronary artery. Coronary artery spasm should be considered among the causes of abrupt and unexpected circulatory collapse after open heart surgery even in the absence of coronary artery disease.

Coronary Vasospasm↗

[Quadricuspid aortic valve: three case reports and review of the literature].

Three patients with grade 3 aortic regurgitation caused by rare congenital quadricuspid valve underwent aortic valve replacement. Patients were two females (51 and 45 years old) and a 51 year-old male. The first case showed 2 equal larger and 2 equal smaller valves. In the latter two cases, 4 equal sized cusps were noted. Fibrous trabeculations bridging the aortic wall and the commissures, giving an appearance of a hammock, were noted in the third case. Small fenestations were also noted in two cusps in this case. These findings may suggest dysplastic feature of the quadricuspid aortic valve. Hypertension seemed to have played an important role in the occurrence of regurgitation in their 4th or 5th decade of life. Their postoperative courses were uneventful.

Aortic Valve↗

Voltage-dependent modulation of L-type Ca2+ current by manidipine in guinea-pig heart cells.

Effects of manidipine, a dihydropyridine derivative, on L-type Ca2+ currents were examined in guinea-pig ventricular cells, using the whole-cell patch-clamp method. At a holding potential of -37 mV, manidipine decreased the Ca2+ current at concentrations above 0.1 nM, and abolished it at 100 nM (IC50 = 2.6 nM). At a holding potential of -78 mV, manidipine did not suppress the Ca2+ current at concentrations less than 100 nM, but increased the Ca2+ current slightly at a concentration of 10 nM. The antagonistic effect of manidipine was significant at concentrations above 100 nM (IC50 = 400 nM). The voltage-dependent effect of manidipine on the Ca2+ current may explain the weak negative inotropism of manidipine in ventricular muscles, and provide an electrophysiological basis for its vascular selectivity.

Animals↗

Cloning and chromosome mapping of the human Mel-18 gene which encodes a DNA-binding protein with a new 'RING-finger' motif.

It has recently been reported that there exists a new 'RING-finger' protein family among the zinc-finger (Zf) proteins. Previously, we had isolated the mouse Mel-18 cDNA (mMel-18) encoding the nuclear RING-finger protein that exhibits an ability to bind to a nonspecific DNA column. Here, we have isolated and characterized the human Mel-18 cDNA (hMel-18) using the mMel-18 cDNA as a probe. The deduced hMel-18 protein contains 344 amino acids (38 kDa) with a RING-finger motif, a helix-loop-helix (HLH)-like structure and a Pro/Ser-rich region. The hMel-18 gene is conserved among vertebrates. Its mRNA is highly expressed in placenta, lung and kidney, but the level is low in liver, pancreas and skeletal muscle. Using in situ hybridization, we mapped hMel-18 to band q22 of chromosome 12. It is possible that the Mel-18/bmi-1 gene family represents a mammalian homologue of the Drosophila polycomb gene group.

Amino Acid Sequence↗

Extrathymic development of V alpha 14-positive T cells.

It is known that rearrangement of the T cell antigen receptor (TCR) gene occurs in the thymus during T cell development and consequently results both in the deletion of DNA between the variable (V) and diversity/joining segments and in the formation of a circular DNA with recombination signal sequences. Here, we provide evidence that V alpha 14+ TCR gene rearrangements take place in extrathymic sites, such as bone marrow, liver, and intestine, but not in spleen, because we were able to detect frequent productive and nonproductive V alpha 14+ coding and signal sequences as a result of TCR rearrangements in extrathymic sites. Similar findings were also detected in athymic mice. Quantitative analysis shows that the relative amounts of V alpha 14 gene-mediated signal sequences in extrathymic tissues are higher than those in thymus. On the contrary, TCR rearrangements of V alpha 1.1 T cells, which are known to develop in the thymus, were mainly detected in the thymus, Peyer's patch, and spleen, but not in other extrathymic tissues, showing patterns distinct from V alpha 14 TCR rearrangements. These findings are evidence of extrathymic development of V alpha 14+ T cells. Differential characteristic TCR rearrangement patterns also indicate that distinct TCR repertoires are generated in different lymphoid tissues.

Animals↗

Histological evaluation of the intrahepatic biliary tree in intrahepatic cholesterol stones, including immunohistochemical staining against apolipoprotein A-1.

Apolipoprotein A-1 is known to be one of inhibiting factors of cholesterol nucleation in bile, and decreased activity of apolipoprotein A-1 is considered to predispose cholesterol-supersaturated bile to formation of cholesterol crystals. To study the pathogenesis of the intrahepatic formation of cholesterol stones, we examined surgically resected liver specimens from six patients with intrahepatic cholesterol stones and compared the characteristic histopathological features with those of intrahepatic calcium bilirubinate stones, using morphological examination and immunohistochemical staining against apolipoprotein A-1. Morphologically, in all six patients with cholesterol stones the severity of chronic proliferative cholangitis with proliferation of the mucus-producing glandular elements in the walls of the large bile duct or periductal tissues was less extensive than that seen with calcium bilirubinate stones, and cholesterol crystals had formed in the septal and interlobular bile ducts. Immunohistochemically, unlike the normal liver and calcium bilirubinate stone-containing lobes, the hepatocytes and the epithelial lining of the bile ducts and peribiliary glands of the cholesterol stone-containing lobes did not react completely (some of the epithelial cells reacted only faintly) with apolipoprotein A-1 antibody. These findings suggest that an abundance of mucous substance and bacterial infection of the biliary tree may not be necessary for the formation of cholesterol stones, compared with findings in cases of calcium bilirubinate stones. We suggest that cholesterol crystals may be produced in the septal and interlobular bile ducts in the microenvironment of cholesterol-supersaturated bile and decreased activity of apolipoprotein A-1.

Adult↗

A case report of resected primary duodenal carcinoma associated with early gastric cancer and cumulative results at 21 institutions in Japan.

A case of primary duodenal carcinoma simultaneously associated with an early gastric cancer is reported. A 72-year-old woman complaining of appetite loss and nausea was admitted in June 1988. Endoscopic examination showed an ulcerative lesion in the angle of the stomach and a Borrmann type 2 tumor in the bulb of the duodenum. Both lesions were revealed to be adenocarcinomas by histological examination of obtained biopsy specimens. Synchronous carcinoma was diagnosed and pancreatoduodenectomy and lymph node dissection were performed. The primary tumor of the duodenum was histologically a moderately differentiated adenocarcinoma, and the gastric cancer was a tumor limited to the mucosa. Metastasis was recognized in a regional lymph node (No. 14A). There has been no recurrence during the 4-year postoperative follow-up period. This result suggests that pancreatoduodenectomy with systematic regional lymph node dissection can greatly contribute to prolonging the survival of patients with advanced duodenal cancer. This case is very rare, in that curative operation was performed for a primary duodenal carcinoma simultaneously associated with an early gastric cancer.

Adenocarcinoma↗

Pancreatitis and anomalous union of the pancreaticobiliary ductal system in childhood.

From January 1978 to December 1989, 48 patients were diagnosed as having anomalous union of the pancreaticobiliary ductal system (AUPBD) at the Second Department of Surgery, Kanazawa University Hospital and its affiliated hospitals. Among these 48 patients, 13 (28.1%) were children under 13 years of age. Four of these patients had acute pancreatitis. The clinical, radiological, and surgical features of these patients are presented. The chief presenting complaint was epigastric pain in all cases; three patients had recurrent episodes of epigastric pain and had been diagnosed as having autotoxicosis. AUPBD was clearly demonstrated in all patients, three by endoscopic retrograde cholangiopancreatography (ERCP) and one by operative cholangiography. At operation, macroscopic evidence of pancreatitis was recognized in all cases. In one case, roentogenolucent pancreaticolithiases were seen on ERCP. We consider AUPBD as an important cause of pancreatitis in children and advocate ERCP in children who are suspected having biliary tract or pancreatic disease. The diagnosis of AUPBD should be considered when children with abdominal pain and elevated serum or urinary amylase levels are evaluated.

Abnormalities, Multiple↗

Membrane currents of porcine granulosa cells in primary culture: characterization and effects of luteinizing hormone.

In ovarian granulosa cells, LH depolarizes the membrane potential and induces steroid production. The membrane currents of porcine granulosa cells in primary culture were studied by means of the whole cell configuration of the patch-clamp technique to investigate whether the ionic channels are involved in the effects of LH. We identified and characterized two types of K+ currents--a transient outward current (Ito) and a delayed rectifier K+ current (IK)--and one Ca2+ current (ICa). Ito and IK were voltage- and calcium-dependent. Both currents were blocked by 4-aminopyridine, a K+ channel blocker, but only IK was sensitive to tetraethylammonium, another K+ channel blocker. ICa was inactivated within 50 ms of the test pulse. Nifedipine and verapamil, L-type CA2+ channel blockers, did not suppress ICa even at a concentration of 10 microM. Tetramethrin (1 microM), a T-type Ca2+ channel blocker, decreased ICa by 38.4 +/- 5.6% (n = 3). These findings suggest that the current may be a T-type Ca2+ current. LH and dibutyryl cAMP, potent stimulants of steroid production, attenuated Ito only by 13.9 +/- 1.8% (n = 7) and 21.0 +/- 1.5% (n = 4), respectively. However, they did not affect IK and ICa. These results indicated that LH does not modulate CA2+ current directly, but it slightly decreased Ito through cAMP elevation. The LH-induced inhibition of Ito may be involved in the depolarizing effect of LH and may play some role in steroid secretion or other functions in granulosa cells.

4-Aminopyridine↗

Effects of MS-551, a new class III antiarrhythmic drug, on action potential and membrane currents in rabbit ventricular myocytes.

1. Electrophysiological effects of MS-551, a new class III antiarrhythmic drug, were examined and compared with those of (+)-sotalol in rabbit ventricular cells. 2. In rabbit ventricular muscles stimulated at 1.0 Hz, MS-551 (0.1-10 microM) and (+)-sotalol (3-100 microM) prolonged action potential duration (APD) and effective refractory period without affecting the maximum upstroke velocity of phase 0 depolarization (Vmax). The class III effect of MS-551 was approximately 30 times more potent than that of (+)-sotalol. 3. Class III effects of MS-551 and (+)-sotalol showed reverse use-dependence, i.e., a greater prolongation of APD at a longer cycle length. 4. In rabbit isolated ventricular cells, 3 microM MS-551 and 100 microM sotalol inhibited the delayed rectifier potassium current (IK) which was activated at more positive potentials than -50 mV and saturated around +20 mV. 5. MS-551 at a higher concentration of 10 microM decreased the transient outward current (Ito) and the inward rectifier potassium current (IK1) although 100 microM sotalol failed to inhibit these currents. 6. MS-551 is a non-specific class III drug which can inhibit three voltage-gated K+ channels in rabbit ventricular cells.

Action Potentials↗

Induction by endogenous noradrenaline of an alpha 1-adrenoceptor-mediated positive inotropic effect in rabbit papillary muscles.

1. The possible involvement of alpha 1-adrenoceptors in the inotropic and electrophysiological responses to endogenous noradrenaline released by tyramine was examined in rabbit papillary muscles. 2. A concentration-dependent positive inotropic effect was produced by tyramine. This effect of tyramine was not observed in muscles from rabbits pretreated with reserpine. 3. The positive inotropic effect of tyramine was greatly inhibited by propranolol, but not altered by prazosin. However, when beta-adrenoceptors were blocked by pretreatment with propranolol, tyramine still produced a positive inotropic effect, an effect which was antagonized by prazosin. 4. Tyramine caused a decrease in action potential duration (APD) and an increase in action potential amplitude in a concentration-dependent manner. Isoprenaline also produced the same electrophysiological effects. These electrophysiological effects of both agents were inhibited by propranolol. 5. When beta-adrenoceptors were blocked by propranolol, the observed prazosin-sensitive positive inotropic effect of tyramine was not accompanied by any change in APD. In contrast, APD was markedly prolonged by alpha 1-adrenoceptor stimulation with phenylephrine in the presence of propranolol, in association with the positive inotropic effect. 6. It is concluded that in rabbit papillary muscles, endogenous noradrenaline causes a positive inotropic effect predominantly mediated by beta-adrenoceptors, but can still evoke a positive inotropic effect through alpha 1-adrenoceptors when beta-adrenoceptor stimulation is eliminated. This suggests that the alpha 1-adrenoceptor-mediated positive intropic mechanism(s) may be masked by simultaneous activation of beta-adrenoceptors. In addition, this study indicates that APD prolongation is not involved in the alpha 1-adrenoceptor-mediated inotropic responses to endogenous noradrenaline.

Action Potentials↗

Altered cardiac adrenergic neurotransmission in streptozotocin-induced diabetic rats.

1. Functional alterations of the sympathetic neuroeffector junction of the left atria were studied in rats with streptozotocin-induced diabetes. 2. Eight to 12 weeks of diabetes resulted in a marked decrease in the positive inotropic response of left atria to electrical field stimulation (EFS). 3. The overflow of [3H]-noradrenaline from diabetic left atria caused by EFS was much less than that from control preparations. 4. The concentration-response curves showed no change in sensitivities of the left atria to exogenous noradrenaline and tyramine in diabetic rats. The maximum positive inotropic response to these agents were similar in diabetic and control animals. 5. The left atrial content of noradrenaline was not significantly changed in diabetic rats. The cocaine-sensitive uptake of [3H]-noradrenaline was also unaltered. 6. Atropine enhanced the positive inotropic response and [3H]-noradrenaline overflow induced by EFS in control left atria. Similarly, yohimbine caused an enhancement of EFS-evoked inotropic response in control atria. However, these effects of the antagonists were not observed in diabetic left atria. 7. It is concluded that the decrease in the positive inotropic response of the left atria to EFS in diabetic rats is caused by an impairment of noradrenaline release from the sympathetic nerve terminals through a calcium-dependent exocytotic mechanism. The present results also indicate that presynaptic alpha 2-adrenoceptors and muscarinic receptors that are linked to inhibition of the noradrenaline release during nerve stimulation may be functionally impaired in diabetic animals.

Animals↗

Serum inorganic fluoride levels in mildly obese patients during and after sevoflurane anesthesia.

Serum inorganic fluoride levels in obese versus control patients were compared during and after sevoflurane anesthesia. Mean serum inorganic fluoride levels in the obese group increased more rapidly and were significantly higher than in the control group at each sampling time (P < 0.01). The area under the curve of fluoride concentration, versus time up to 24 h and 48 h in the obese patients, was significantly greater than that in the nonobese patients (P < 0.001). Peak serum fluoride level in the obese patients was 51.7 +/- 2.5 mumol/L and exceeded 50 mumol/L for nearly 2 h. Our study showed that serum fluoride concentrations between mildly obese and nonobese patients differed during and after sevoflurane anesthesia.

Adult↗