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Biomedical subjects

A Hayashi

Publications and source records attributed to A Hayashi.

At least 271 records · Page 15Linked to original sources

Heterotopic pancreas as a rare cause of gastrointestinal hemorrhage in the newborn: report of a case.

We report herein a female infant in whom a heterotopic pancreas in the stomach caused gastrointestinal hemorrhage during the newborn period. Endoscopy was essential for ruling out other causes of hemorrhage and to follow the patient until the time of elective surgery at 6 months of age. Heterotopic pancreas should be borne in mind as a rare cause of gastrointestinal hemorrhage in the newborn when an unexplained gastrointestinal hemorrhage continues, and the lesion was discussed in relation to our experience of upper gastrointestinal endoscopies and a review of the literature.

Choristoma↗

Decreased blood coagulation activities in carbohydrate-deficient glycoprotein syndrome.

The carbohydrate-deficient glycoprotein (CDG) syndromes are a newly recognized group of inherited metabolic diseases. We report a Japanese brother and sister with a CDG syndrome. Both patients showed decreased activities of blood coagulation Factor XI and of the coagulation inhibitor protein C. In one of them there was also a somewhat decreased activity of Factor IX and of antithrombin III. Isoelectric focusing of antithrombin III revealed a decrease of negatively charged fractions and an increase of more cathodal bands. Furthermore, there was a discrepancy between activity and antigen level of Factor VIII and protein C. The patients had an incidental deficiency of factor XII. This is the first detailed report on blood coagulation systems in the CDG syndromes. These blood coagulation abnormalities may explain at least in part the thrombotic or haemorrhagic complications of the CDG syndromes.

Antithrombin III↗

Neonatal surgery: intensive care unit versus operating room.

The critically ill neonate with a surgical condition requires transfer to an operating room (OR), a process which may be associated with significant morbidity. In an effort to reduce such morbidity, we performed surgery on critically ill neonates in a designated area of our neonatal intensive care unit (NICU) over the past 4 years and have compared the outcome for infants operated on within the NICU with infants operated on in the OR over the same period. There were 81 procedures performed in the NICU compared with 112 in the OR. Infants operated on in the NICU had lower birthweights (1,758 g v 2,457 g), lower gestational ages (31.3 weeks v 35.8 weeks), and lower presurgical weights (2,118 g v 2,922 g) (all P < .0001). In addition, infants operated on in the NICU had a greater severity of illness with 78% requiring mechanical ventilation versus 26% for the OR group (P < .0001) with a higher presurgical FiO2 (.43 v .31, P = .005), and a higher presurgical mean airway pressure (8.0 cm H2O v 6.2 cm H2O) for infants requiring mechanical ventilation. The overall mortality was higher in the NICU group (14% v 2%), reflecting their underlying prematurity, illness, and anomalies. There was only one surgically related death, which occurred in the NICU group. There was no significant difference in culture-proven sepsis, length of surgery, change in weight, temperature, blood pressure, heart rate, FiO2, mean airway pressure, or oxygen index associated with surgery, but there was a significantly higher incidence of hyperthermia with a temperature of greater than 37.5 degrees C in the OR group (17.8% v 3.7%, P = .002). Our experience suggests that surgical procedures can be performed in the NICU for the unstable critically ill neonate with a morbidity comparable to that seen in the OR. Further experience is needed to compare the risks and benefits of this approach.

Critical Illness↗

Effects of a new diphenylpiperazine calcium antagonist, KB-2796, on cerebral ischemic neuronal damage in rats.

1. The effects of KB-2796, a new diphenylpiperazine calcium antagonist, on the mitochondrial dysfunction and energy metabolism deficits were examined in the ischemic rat brain. 2. KB-2796 (30 mg/kg, p.o.), administered 60 min prior to decapitation, improved the reduced respiratory activity of mitochondria obtained from rat brain 5 min after decapitative ischemia. 3. KB-2796 (30 mg/kg, p.o.), administered 60 min prior to ischemic insult, improved both the reductions in pyruvate and ATP and prevented increases in the lactate/pyruvate ratio induced by 30-min forebrain ischemia in rats with 4-vessel occlusion (4-VO). 4. The effect of KB-2796 on local cerebral glucose utilization (LCGU) was examined by a quantitative autoradiographic 2-[14C]deoxyglucose method in normal and 4-VO rats. 5. Postischemic LCGU measured 24 hr after reperfusion in the forebrain, in particular in the cortex, thalamus, geniculate body, hippocampus, caudate-putamen, nucleus accumbens, colliculus, and corpus callosum, was below the normal control value. 6. KB-2796 (1 mg/kg, i.v.), administered 1 min prior to the injection of 2-[14C]deoxyglucose, improved the reductions in LCGU that were produced by cerebral ischemia in the cortex, thalamus, geniculate body, caudate-putamen, nucleus accumbens and substantia nigra, but did not affect LCGU in normal rats. 7. These findings suggest that KB-2796 minimized the deficits in brain energy metabolism produced by ischemia; this agent may therefore be a valuable therapeutic drug in cerebrovascular-related disorders.

Animals↗

Tension hemopericardium complicating neonatal pneumopericardium.

The case of a premature infant ventilated for hyaline membrane disease and complicated by recurrent tension pneumopericardium requiring surgical drainage is reported. The infant improved but developed a tension hemopericardium following the removal of the surgical drain. He had cardiac arrest, responded to resuscitation and drainage of the tension hemopericardium with a percutaneous catheter. At thoracotomy, a bleeding epicardial vessel was found and ligated. The infant survived and appeared to be normal at discharge.

Catheters, Indwelling↗

Reverse first dorsal metatarsal artery flap for reconstruction of the distal foot.

A method for reconstruction of soft tissue defects of the distal foot, web spaces, and toes using the reverse first dorsal metatarsal artery flap is presented. This flap is supplied by minute cutaneous branches of the first dorsal metatarsal artery and can be extended to the territory of the dorsalis pedis artery. We have applied this flap to 11 patients since 1987. Superficial tip necrosis occurred in 3 flaps among 8 extended ones, however, they healed spontaneously and satisfactory results were obtained in all patients. Two other reverse flow flaps based on the second, and the third and fourth dorsal metatarsal arteries, respectively, have also been applied. The versatility and pitfalls of reverse dorsal metatarsal artery flaps are discussed.

Adolescent↗

Changes of proliferative activity and phenotypes in spontaneous differentiation of a colon cancer cell line.

We examined the alterations of proliferative activity and c-myc expression of a colon cancer cell line (Caco-2) during its spontaneous differentiation. Caco-2 cells were cultured in various types of media and the degree of differentiation was monitored in terms of dome formation in cell monolayers and expression of alkaline phosphatase (ALP) activity. In Caco-2 cells cultured with Eagle's minimum essential medium (EMEM) containing 10% fetal calf serum (FCS), dome formation was demonstrated and ALP activity was markedly increased after the cells reached confluence. Five-fold reduction of c-myc mRNA and a marked decrease in S-phase cells were observed in the differentiated cells. These changes were not induced in FCS-free EMEM. The addition of insulin and transferrin to FCS-free EMEM did not induce cell differentiation or reduction of c-myc mRNA expression. When Caco-2 cells were cultured with three different serum-free media, the induction of dome formation and the increase of ALP activity were observed to varying degrees. Expression of c-myc mRNA in the cells cultured with one serum-free medium decreased to a level similar to that in fully differentiated cells cultured with EMEM containing 10% FCS. These results suggest that a spontaneous switch from a proliferative state with high c-myc expression to differentiated phenotype occurs after cells reach confluence and depends on the culture conditions.

Cell Differentiation↗

Interleukin 2 and interferon-gamma augment anticolon antibody dependent cellular cytotoxicity in ulcerative colitis.

In vitro effects of cytokines and therapeutic drugs on antibody dependent cellular cytotoxicity (ADCC) mediated by anticolon antibody were investigated in serum samples from patients with ulcerative colitis. A 51Cr release assay was used to examine ADCC activity with the colon cancer cell line, colo 205, as the target and peripheral blood mononuclear cells as the effector. High ADCC activity was shown in 13 of 32 (41%) patients with ulcerative colitis. This ADCC activity was inhibited by protein A treatment of the serum samples. Interleukin 2 (IL2) activated effector cells could enhance ADCC activity, but interferon-gamma (IFN-gamma) or tumour necrosis factor-alpha (TNF-alpha) had no effect on the cytotoxic activity of effector cells. Treatment of target cells with IFN-gamma increased the vulnerability of these cells to ADCC with a large increase of intercellular adhesion molecule-1 (ICAM-1) expression on their surface. Monoclonal antibodies to ICAM-1 inhibited this IFN-gamma enhanced ADCC activity. Interestingly, prednisolone (PSL) reduced ADCC activity, but sulphasalazine (SASP) or 5-aminosalicylic acid (5-ASA) did not. These results suggest that IL2 and IFN-gamma could enhance colonic epithelial cell injury mediated by the ADCC mechanism in ulcerative colitis and that ADCC enhanced by cytokines is restored by PSL treatment.

Adolescent↗

Ca(2+)-induced increase in oxidative metabolism of dissociated mammalian brain neurons: effect of extract of ginkgo biloba leaves.

Effect of an extract of Ginkgo biloba leaves (EGb) on oxidative metabolism was studied using rat brain neurons and 2',7'-dichlorofluorescin fluorescence. Ionomycin (100 nM to 1 microM), a Ca(2+)-ionophore, dose-dependently augmented the 2',7'-dichlorofluorescin fluorescence in the presence of external Ca2+, but not under the external Ca(2+)-free condition. Preincubation of neurons with EGb (3 micrograms/ml) greatly reduced the ionomycin-induced increase in 2',7'-dichlorofluorescin fluorescence. Results suggest that EGb may reduce the Ca(2+)-induced increase in the oxidative metabolism of brain neurons.

Animals↗

Characteristics of a 28-kDa collagenous protein extracted with guanidine from EDTA-demineralized rabbit alveolar bone.

Bone proteins in alveolar bone of mandibles from young adult rabbits (3-month-old) were extracted with 4.0 M guanidine hydrochloride (GuHCl), followed by 0.5 M ethylenediaminetetraacetate, and again with 4.0 M GuHCl (G2-ext). The proteins in the G2-ext were fractionated on a gel-filtration column, followed by an anion-exchange column in the presence of 7.0 M urea. A 28-kDa protein was isolated from the G2-ext. The purified 28-kDa protein showed intense staining with silver on SDS-PAGE slab-gel under reducing conditions. This protein was digested with bacterial collagenase, and a 19-kDa fragment appeared on the gel. However, the protein was not susceptible to reduction with cyanogen bromide. The protein did not bind to hydroxyapatite crystals in the presence of 7.0 M urea, and also did not bind to some lectins. On SDS-PAGE under non-reducing conditions, the protein migrated as two bands; a new band appeared at approximately the 85-kDa region in addition to the original 28-kDa band. The amino acid compositions of the protein were similar to those of the alpha 1-pN-propeptide of type I procollagen obtained from other tissues.

Alveolar Process↗

Urinary epidermal growth factor in patients with gliomas: significance of the factor as a glial tumor marker.

Epidermal growth factor (EGF) content in urine from patients with glial tumors was examined by radioimmunoassay techniques with labeled human EGF and its rabbit EGF polyclonal antibody. There was no cross-reaction with transforming growth factor-alpha, which has a common receptor with EGF. Forty glial tumors were divided into three groups according to the clinical stage: Samples from Group A patients were obtained before therapy and/or after biopsy; in these patients a large volume of tumor was apparent on computerized tomography (CT). Group B samples were obtained after gross total removal of the tumor and/or chemo- and radiation therapy; these patients showed a small volume of residual tumor on CT. Samples from Group C patients were obtained after gross tumor total removal and/or chemo- and radiation therapy; no tumor was detected on CT scans in these patients. Urinary EGF levels in Group A samples were statistically significantly higher than in samples from healthy individuals (p < 0.001), Group B patients (p < 0.10), and Group C patients (p < 0.02). In addition, high-grade glial tumors in Group A cases showed a significantly higher level of urinary EGF than low-grade tumors in Group A patients (p < 0.05), or patients with meningioma (p < 0.02), metastatic brain tumor (p < 0.05), and cerebral infarction (p < 0.001). Longitudinal changes of urinary EGF levels in glioma patients mostly synchronized with the clinical course and therapeutic interventions. Therefore, urinary EGF, as a glial tumor marker, may be of practical value for diagnosing a malignant glioma and evaluating for the efficacy of chemo- and radiation therapy.

Adolescent↗

[Ultrastructure of immotile spermatozoa obtained from infertile male patients].

We sometimes experienced infertile patients whose sperms had no motility but were not stained by Eosin Y. In this paper we report five cases of so-called "immotile spermatozoa". The ultrastructure of sperm tails was examined by transmission electrone microscope (TEM). These cases were selected from the out-patient population who attended infertility clinic of our department. The semen analyses showed that all the cases had sperm motility below 1% and more than 90% of the spermatozoa were proven alive. Family history revealed that one case had an infertile sibling. None of them had situs inversus, bronchiectasis and chronic sinusitis which are classic trias of Kartagener's syndrome. They had no symptoms of upper respiratory tract infection which was caused by the abnormality in the flagella of the respiratory tract. The TEM pictures of sperm tails showed partial deletion of inner dynein arms in two cases, lack of central microtubular doublets (so-called 9 + 0) in two cases and disarrangement of microtubular doublets in one case. For the treatment of these cases there is no effective means but AID. However, the rapid progress of IVF-ET techniques and a report that the spermatozoa from Kartagener's syndrome had showed penetration into eggs encouraged us to think the micromanipulation of spermatozoa with IVF-ET as a hopeful option of the treatment in the near future.

Adult↗

[Subpopulation of leucocytes in the semen from fertile and infertile men--immunohistochemical and flow-cytometric analysis].

It is hard to differentiate leucocytes from immature germ cells among many round cells in ejaculated semen. Recently monoclonal antibodies (MoAbs) which recognize surface antigen of various subtypes of leucocytes are available. In this study we applied a panel of MoAbs for leucocyte subpopulations (granulocytes, T-lymphocytes, B-lymphocytes, Monocytes/Macrophages and pan-leucocytes). Semen smears from 64 mild oligozoospermic patients and 5 fertile volunteers were stained by immunohistological technique (avidin-biotin-immunoperoxidase method). We found highly varying total leucocyte numbers ranging from 1200 to 2.2 x 10(8) per ejaculate. When comparing semen from infertile patients with those from fertile donors, statistically significant higher medians of total leucocytes, total granulocytes and monocytes/macrophages were seen in infertile group. We compared a total number of leucocytes obtained from conventional Papanicolaou staining with that from immunohistochemical staining. Both were almost identical but the former gave a little bit higher value, because of the difficulty in differentiating leucocytes from immature germ cell by Papanicolaou staining. Moreover we performed an experiment to evaluate the applicability of flow-cytometry (FCM) to count leucocytes in semen. Cells in the semen smears were stained with MoAbs recognizing the surface antigen shared by every leucocyte, and percentage of the leucocytes which were thus stained with MoAbs was compared with that determined by FCM. Results from FCM constantly gave lower value than these from immunostaining. This is probably because FCM could not differentiate leucocytes from contaminated non cell substances (e.g. cell debris). From the present study it is not adequate to use FCM for the detection of leucocytes in semen as applied in haematology. Further techniques to remove non-cellular substances should be established for its application in semen analysis.

Antibodies, Monoclonal↗

Antitumor activity of acemetacin in mice bearing colon 26 carcinoma: a preliminary report.

The antitumor activity of acemetacin (ACM) was examined in mice bearing colon 26 carcinoma and its effect was compared with indomethacin (IND). The addition of ACM (0.001-0.003%) to drinking water prolonged the survival time of mice bearing colon 26. On the other hand, prostaglandin E2 (PGE2) reduced the effect of ACM. The results suggest that the antitumor activity of ACM may be associated with the reduction of PGE2 levels.

Animals↗

[The background of foreign patients with pulmonary tuberculosis and investigation of treatment results].

This study focuses on the investigation of 35 foreign patients diagnosed as having pulmonary tuberculosis and treated at National Chiba-Higashi Hospital and the Chiba Anti-Tuberculosis Association between 1987 and 1991. All of the patients had lived in Japan less than five years. A large number of the patients were in their 20s. The chest X-rays of 24 cases (70%) revealed cavitary and sputum smear cultures for Mycobacterium tuberculosis were positive in 27 cases (77%). Many patients were in moderately advanced stages of the disease, becoming ill soon after their arrival in Japan, and being diagnosed symptomatically. Among the 35 cases, eight cases failed to finish treatment. Of those failing to finish, six were female and two were male. The results of sputum smear cultures of the patients failing to complete treatment revealed four cases that tested positive. Among those cases failing to complete treatment, four patients discharged themselves, three patients stopped during out-patient treatment, and one patient had to return to her home country because of a legal problem. A total of 14 patients were illegal immigrants: three of them failed to complete treatment because of their illegal status, and two of them due to unspecified reasons.

Adolescent↗

[A case of Hashimoto's encephalopathy with a relapsing course related to menstrual cycle].

A case of 43-year-old woman with Hashimoto's encephalopathy who experienced three relapses closely associated with the menstrual cycle is reported. In April 1992, she began to experience occasional tremors in her arms. Three months later, she experienced a generalized seizure and was transferred to our hospital. Hashimoto's thyroiditis was diagnosed on the basis of high thyroid microsomal titer and mild hypothyroidism. Neurological findings in admission included action tremor in both hands, myoclonus in all extremities, cerebellar ataxia, confusion, and hyperreflexia. Cerebrospinal fluid showed elevated protein level without pleocytosis. Electroencephalogram showed diffuse slowing and magnetic resonance imaging of brain was normal. Hashimoto's encephalopathy was diagnosed from these findings. These episodes of remission and exacerbation were observed during the admission. Her symptoms started at ovulation, worsened during the luteal phase, and improved when menstruation started. After the third relapse, she was treated with oral thyroxine for hypothyroidism and with an estrogen and progesterone combination to regulate the menstrual cycle. Her thyroid function gradually became euthyroid and she did not experience any subsequent relapses. The relation between the relapsing course and menstrual cycle suggests that the periodic alteration of gonadotrophic and/or gonadal hormones or the menstrual regulating center itself in the brain may be an important factor of pathogenetic mechanism of the disorder.

Adult↗

Studies on familial hypotransferrinemia: unique clinical course and molecular pathology.

Some unsolved problems--late onset of anemia and growth retardation (at age 7 years), healthy siblings showing very low transferrin (TF) level, and unexplained mode of inheritance--were found in family members of a congenital atransferrinemia already reported in 1972. The long-term clinical, laboratory, and developmental observations revealed that after 5 years of apo-TF supplementary therapy the patient's anemia gradually disappeared, and he started to grow again without further therapy. Immunoelectrophoretic study disclosed a severe deficiency of both TF and haptoglobin in the patient. The recovery from his anemia and the resumption of his physical development were dependent only on his TF level: that is, from a negligible level it increased to 10-20 mg/dl (normal, 205-370 mg/dl), a level similar to that of his TF-deficient siblings, who had been in good health since birth. The TF analysis of the patient and his family suggests that the minimum TF requisite in this family may be close to 10-20 mg/dl; subjects with more than 20 mg/dl are apparently healthy; with less than 10 mg/dl they may develop severe growth retardation and anemia, and extreme deficiency may be lethal. Also, coexisting haptoglobin deficiency might alleviate hemosiderosis. Further, the isoelectric focusing study disclosed that there was only a small amount of TF variant in these siblings including the patient. The study of the family confirmed that this variant was produced by an allelic gene derived from their father. So, the original diagnosis of congenital atransferrinemia should be revised as familial hypotransferrinemia transmitted with autosomal recessive mode, and the subjects with a recessive character may be compound heterozygotes of the "variant" allele and the "null" allele.

Adolescent↗