The Chemical Relationship between Fungus and Beetles on Ponderosa Pine

Volatile components of Cryptoporus volvatus attracting three pine beetles (Ischnodactylus loripes, Alphitophagus plagiatus, Bolitophagus felix, family Tenebrionidae) were isolated and found to be a mixture of two monoterpenes and an aliphatic hydrocarbon by means of GC-MS. The attractivity of the fungus for the beetles can be induced by synergistic action of (+)-isopinocamphone, (+)-trans-pinocarveol, and 1,3E , 5Z -undecatriene.

Improved thermodynamic parameters and helix initiation factor to predict stability of DNA duplexes

To improve the previous DNA/DNA nearest-neighbor parameters, thermodynamic parameters (deltaH degrees, deltaS degrees and deltaG degrees) of 50 DNA/DNA duplexes were measured. Enthalpy change of a helix initiation factor is also considered though the parameters reported recently did not contain the factor. A helix initiation factor for DNA/DNA duplex determined here was the same as that of RNA/RNA duplex (deltaG degrees(37) = 3.4 kcal/mol). The improved nearest-neighbor parameters reproduced not only these 50 experimental values used here but also 15 other experimental values obtained in different studies. Comparing deltaG degrees(37) values of DNA/DNA nearest-neighbor parameters obtained here with those of RNA/RNA and RNA/DNA, RNA/RNA duplex was generally the most stable of the three kinds of duplexes with the same nearest-neighbor sequences. Which is more stable between DNA/DNA and RNA/DNA duplexes is sequence dependent.

Radiotherapy of T1 and T2 glottic cancer: analysis of anterior commissure involvement

From January 1984 to December 1993, 184 patients with previously untreated T1 and T2 (UICC 1987) laryngeal glottic cancer underwent radiotherapy at Hyogo Medical Center for Adults. The prognostic variables analyzed included sex, age, smoking index, T stage, tumor size, tumor type, gross anterior commissure involvement (gross ACI), histological differentiation, administered dose, TDF, overall treatment time, chemotherapy, initial response, and the dose required to achieve CR. Both univariate and multivariate analyses were performed. The T stage, tumor size, and gross ACI were significant variables in univariate analysis, while the tumor type and gross ACI were significant on multivariate analysis. The 5-year recurrence-free survival of patients with gross ACI was significantly worse than that of those without ACI (57.6% vs. 89.9%). Among gross ACI patients, the recurrence-free survival of those treated with 70-72 Gy was superior to that of those receiving 60-62 Gy, suggesting that at least 70 Gy was necessary to control such diseases.

Acoustic characteristics of the human paranasal sinuses derived from transmission characteristic measurement and morphological observation

This paper reports on the acoustic characteristics of the paranasal sinuses as determined from transmission characteristic measurements and morphological examinations. A new experimental approach was developed to explore the correspondence between antiresonance frequencies and the causal resonators [J. Dang and K. Honda, J. Acoust. Soc. Jpn. (E) 17, 93-99 (1996)], and it was adopted to determine the antiresonance frequency of each sinus cavity. In this study, the antiresonance frequencies and the locations of the sinus openings were estimated from transmission characteristics of the nasal tract for three subjects, and then MRI-based morphological data for the subjects were used to relate each antiresonance frequency to its causal sinus cavity. The results indicate that each of the three major sinuses, i.e., the sphenoidal, maxillary, and frontal sinuses, contributes its own antiresonances to the transmission characteristics of the nasal tract. The estimated antiresonance frequencies were compared with computed natural frequencies of Helmholtz resonators, and the differences were within 10% for the sinuses. On the basis of the frequency distribution of the sinus antiresonance, the acoustic characteristics of the paranasal sinuses were modeled by four Helmholtz resonators. The simulation with the four-zero model showed that the paranasal sinuses not only introduce antiresonances in the transfer function, but also change the spectral shape of the nasal formants.

Rapid and clear detection of ABO genotypes by simultaneous PCR-RFLP method

We reported a new approach of ABO genotyping by a polymerase chain reaction and restriction fragment length polymorphism method. Instead of amplifying the loci containing the positions of nucleotides 258 and 700 of cDNA of the A transferase separately, we successfully amplified these 2 loci together in one reaction mixture using 2 sets of primers. The amplified DNA products were digested at the same time with restriction enzymes Kpn I and Alu I. The digested DNA products were then separated by electrophoresis on polyacrylamide gel. In addition, we evaluated the influence of various amplification parameters (concentration of template DNA, primers, Taq DNA polymerase, MgCl2, and number of cycles). In particular, high Mg2+ concentration (3.5 mM) made effective amplification of this locus without producing any unspecific band. By using that optimized condition for PCR, together with a simultaneous approach, our study proved to be time saving, more economic, and convenient in interpreting the results.

Cellular signaling and proliferative action of AVP in mesangium of SHR: effect of low density lipoprotein

The present study was undertaken to determine whether low density lipoprotein (LDL) modulates the cellular action of arginine vasopressin (AVP) in cultured glomerular mesangial cells of spontaneously hypertensive rats (SHR) and normotensive Wistar-Kyoto rats (WKY). The AVP-induced cellular signal transduction, including inositol 1,4,5-trisphosphate (IP3) production, fura-2 intracellular calcium measurements and cellular alkalinization, was significantly greater in cells of SHR than those of WKY. This is based on an increase in AVP V1 receptor number in cells of the SHR. Also, the AVP activation of mitogen-activated protein (MAP) kinase and [3H]thymidine incorporation was significantly exaggerated in cells of SHR compared with those of WKY. LDL at a concentration of 10 micrograms/ml augmented the cellular signaling and proliferative action of AVP in cells of WKY, but not in those of SHR. Since [3H]AVP receptor binding was not affected by the LDL pretreatment, LDL modulates the signal transduction between a location distal to the AVP receptors and proximal from the production of IP3 and diacylglycerol. These results indicate that an increase in AVP receptor capacity has a profound effect on the AVP-induced cellular signaling and proliferation, and that LDL has a slight alteration on the action of AVP in glomerular mesangial cells of SHR.

Aberrant expression of a hemidesmosomal protein, bullous pemphigoid antigen 2, in human squamous cell carcinoma

Through yet unidentified mechanisms, squamous epithelial cells become committed to terminal differentiation after detachment from the basement membrane. In squamous cell carcinoma, these mechanisms seem to be disturbed. A murine monoclonal antibody, designated NCC-Lu-226 (IgG1, K), which recognizes an antigen expressed in basal cells of squamous epithelium at the epithelio-connective tissue border, was obtained. A cDNA clone encoding the antigen was isolated from a cDNA library by immunoselection. DNA sequencing and a database search revealed that this cDNA clone was identical to a hemidesmosomal transmembrane protein, bullous pemphigoid antigen 2 (BPA-2; also known as BPAG2, BP180, or type XVII collagen). Immunoelectron microscopy validated the specific reactivity of this monoclonal antibody with skin hemidesmosomes. Enhanced expression and abnormal distribution of BPA-2 was revealed immunohistochemically in various precancerous and cancerous tissues, including solar keratosis (4 of 5), Bowen's disease (3 of 5), invasive squamous cell carcinoma (7 of 7) of the skin, and squamous cell carcinoma of the lung (14 of 14), esophagus (12 of 13), and cervix (14 of 17). The specific expression of BPA-2 protein in squamous cell carcinoma was confirmed by RT-PCR and Northern hybridization. BPA-2 has possible phosphorylation sites and is actually phosphorylated in cultured keratinocytes and squamous cell carcinoma. The aberrant expression of BPA-2 may reflect dysfunction of the hemidesmosome that occurs as a relatively early event in multistep carcinogenesis of squamous epithelium.

[A case of right upper lobe carcinoma with lung torsion changed in position]

A 71-year-old man with a pulmonary carcinoma had torsion of the right upper lobe of the lung. A chest radiogram showed change of the opacified lobe in position. At right thoracotomy, we found that the atelectatic right upper lobe occupied with a giant tumor moved freely in the right thoracic cage due to the defect of parenchymal bridge between the contiguous lobes. Though lung torsion is a rare event, it might be kept in mind as a complication of malignant tumors or life-threatening lung infarctions.

Successful engraftment of sibling cord-blood stem cell transplantation in a child with acute promyelocytic leukemia

Cord blood stem cell transplantation (CBSCT) was performed on a patient with acute promyelocytic leukemia. The patient was a boy 3 years and 8 months old, who had shown complete remission following treatment with intensive chemotherapy. However, after the final course of consolidation chemotherapy, chromosome analysis of his bone marrow aspirates revealed 46XY, t(15,17)(q22;q21), and a PML-RAR alpha fusion gene was detected by the reverse transcriptase-polymerase chain reaction test. All-trans retinoic acid diminished the chromosomal abnormality, but the PML-RAR alpha fusion gene remained. The patient was then treated with CBSCT from an HLA-matched sibling donor. The number of nucleated cells in the cord blood was 2.2 x 10(7)/kg of body weight, and that of granulocyte-macrophage colony-forming units 0.6 x 10(4)/kg. Methotrexate was given, on days 3 and 6, as prophylaxis against graft-versus-host disease (GVHD). The neutrophil count rose to above 500/microliters on day 22. The platelet count exceeded 50,000/microliters on day 48. Platelet transfusions were given 12 times after CBSCT, the last one on day 36. Grade I acute GVHD was treated with steroids. The patient was well and discharged on day 103, without symptoms or laboratory data suggestive of relapse. Following this experience we instituted a project of the Kanagawa Cord Blood Bank, which is scheduled for expansion nationwide.

Guidelines for donor selection and an overview of the donor operation in living related liver transplantation

Guidelines for donor selection and an overview of the donor operation are reported on the basis of our experience with 120 cases of living related liver transplantation (LRLT) in pediatric patients. Once the parents had clearly expressed their desire to serve as donors, tests were performed to functionally and anatomically screen the donor livers to determine whether or not the parents' general physical condition allowed them to serve as donors. We then evaluated which of the two parental candidates was more suitable as a donor. The wishes of the family as to which parent should serve as donor was considered secondary and taken into account only in a few cases in which certain functional and/or anatomical abnormalities were uncovered that made the prime candidate less suitable. For the 120 LRLTs, 135 candidates were evaluated as potential donors, 15 (11.1%) of whom were rejected for various reasons. The mean volume of blood loss during the donor operation decreased significantly from 489 g in the first 60 LRLTs to 390 g in the latter 60 LRLTs; this was accompanied by a significant decrease in the mean volume of autologous blood transfused from 449 g to 390 g. Mean cold ischemia time of the graft increased significantly from 71.4 to 128.0 min, while mean operation time conversely decreased from 6.7 to 6.2 h. Bile leakage from the cut surface of the remnant liver, which was the only post-operative surgical complication encountered, was noted in five cases. We conclude that donor candidates should be strictly selected according to basic guidelines, taking into account both the results of preoperative screening and the wishes of the family. With this accumuled experience, we have been able to simplify our LRLT operative procedure, resulting in decreases in blood loss volume, blood transfused, and operation time.

Afferents originating from the dorsal penile nerve excite oxytocin cells in the hypothalamic paraventricular nucleus of the rat

Electrical stimulation of the dorsal penile nerve (DPN) produced orthodromic excitation in about half of oxytocin cells in the paraventricular nucleus (PVN). In contrast, less than 10% of vasopressin cells were excited. Tactile stimulation of the glans penis by a paintbrush produced excitation in 40% of oxytocin cells. Castration did not prevent activation of oxytocin cells. These results suggest that somatosensory information from the penis is transmitted to the PVN through the DPN and that such afferent input preferentially innervates oxytocin cells.

Involvement of protein kinase C in muscarinic agonist-induced contractions of guinea pig ileal longitudinal muscle

1. Carbachol (10(-5) M) caused an initial transient contraction (phasic contraction) and a subsequent late contraction (tonic contraction) in the guinea pig ileum. The phasic contraction was markedly suppressed by calmodulin antagonist W-7, but not by protein kinase C inhibitor H-7. 2. The tonic contraction was suppressed by H-7, but not by W-7. 3. The carbachol-induced phasic contraction in the absence of extracellular Ca2+ was suppressed by both W-7 and H-7. 4. Carbachol (10(-5) M) stimulated the formation of inositol phosphates (IPs) in the guinea pig ileum. The carbachol-induced IPs formation was dependent on the extracellular Ca2+ concentration.

[Detection of early cardiac dysfunction in patients with transfusion-dependent aplastic anemia and chronic iron overload in childhood. Stress-velocity relation as a sensitive index by echocardiography]

In order to detect early-stage left ventricular dysfunction, we examined a load-independent index, that is, the stress-velocity relation, by echocardiography in 13 patients with aplastic anemia including pure red cell anemia. Even when left ventricular contractility and pump function were within the normal range, its afterload had a tendency to increase in transfusion-dependent patients. The patients who had impairment of cardiac pump function died of congestive heart failure within one year after abnormal findings in stress-velocity relation were detected. Therefore, the stress-velocity relation is a sensitive, useful and noninvasive index for detecting asymptomatic myocardial dysfunction in patients with transfusion-dependency and chronic iron overload. It is necessary for these patients to undergo examinations of echocardiography at regular intervals. In case of abnormally in the stress-velocity relation, treatment for afterload mismatch and more effective chelation should be recommended to reduce the burden on the heart. Thereby, the heart is kept in better condition and the prognosis of these patients will be improved.

Determination of ester-type local anesthetic drugs (procaine, tetracaine, and T-caine) in human serum by wide-bore capillary gas chromatography with nitrogen-phosphorus detection

A sensitive method for simultaneous determination of ester-type local anesthetic drugs (procaine, tetracaine, and T-caine) has been developed using wide-bore capillary gas chromatography with nitrogen-phosphorus detection (GC-NPD). The extraction procedure, the experimental conditions for heptafluorobutyryl (HFB) derivative formation, and the percentage of the ester-type local anesthetic drugs from the human serum are described. The HFB derivatives of ester-type local anesthetic drugs showed sensitivity of approximately 2-3 fold higher than that without derivatization. The detection limits of HFB derivatives of the ester-type local anesthetic drugs were approximately 60-70 pg on column. Recoveries from the human serum were 85-94%. This method could be used to determine concentrations as low as 24-28 ng/mliters of the ester-type local anesthetic drugs.

State-dependent changes of extracellular glutamate in the medial preoptic area in freely behaving rats

Microdialysis technique was applied to the medial preoptic area (mPOA) of the hypothalamus, a crucial site for the regulation of sleep, in order to analyze the interrelationship between the extracellular level of glutamate (Glu) and the vigilance states. Dialysates from the mPOA were sampled at 5-min intervals for 2-h diurnal period with a perfusion rate of 2.0 microliters/min in freely moving rats, whose sleep-waking behaviors were polysomnographically monitored. Extracellular Glu increased during wakefulness, exhibiting a peak at the transition period from wakefulness to non-rapid-eye-movement sleep (NREMS) (18.0% above the average), whereas it decreased during NREMS (9.2% below the average). It is likely that Glu in the mPOA is dynamically involved in the alterations of the vigilance states.

Genetic polymorphism of the 3' VNTR region of the human dopaminergic function gene DAT1 (human dopamine transporter gene) in the Mongolian population

The hypervariable region of the dopamine transporter gene (DAT1) was amplified from samples in the Mongolian population. This region includes a variable number of tandem repeats of a 40-bp core unit in the 3' untranslated region of DAT1. Vandenbergh et al. (1992) reported variability in the number of repeats of this 3' flanking region ranging from 3 to 11 times in white and black populations. We examined polymorphism at the DAT1 locus in 78 native Mongolian subjects. We found alleles with 7 to 13 repeats, which is different from the findings of Vandenbergh et al. (1992). The allele distribution of the Mongolian population is similar to that in the Japanese population, reported previously by Nakatome et al. (1995). Chi-square analysis showed a significant lack of homogeneity between our findings in Mongolian subjects and those reported previously in white and black populations. The DAT1 locus was estimated to have a heterozygosity index of 14.1%, and the polymorphic information content was calculated to be 0.16.

Antagonistic effect of YM022, an antiulcer agent in rats, on human cholecystokinin (CCK)B/gastrin receptor

We recently isolated a cDNA clone for the human cholecystokinin (CCK)B/gastrin receptor and permanently expressed this receptor cDNA in NIH-3T3 cells. [125I]CCK-8 specifically bound to the membrane of the transfectant, and this binding was displaced by unlabeled CCK-8 with an IC50 of 0.32 nM. Treatment of these cells with CCK-8 increased the intracellular Ca2+ concentration with an EC50 of 0.30 nM. Using these cells expressing functional human CCKB/gastrin receptors, we investigated the pharmacological properties of (R)-1-[2,3-dihydro-1-(2'-methylphenacyl)-2-oxo-5-phenyl-1H-1, 4-benzodiazepin-3-yl]-3-(3-methylphenyl) urea (YM022), a potent and selective CCKB/gastrin receptor antagonist in rats. YM022 potently inhibited [125I]CCK-8 binding to the membrane with an IC50 of 55 pM and CCK-8-induced Ca2+ mobilization with that of 7.4 nM. On the other hand, its racemate and enantiomer more weakly inhibited this binding (IC50 of 110 pM and 11 nM, respectively) and Ca2+ mobilization (IC50 of 18 nM and 94 nM, respectively). These results indicate that YM022 stereoselectively recognizes the human CCKB/gastrin receptor as a potent antagonist and that the established transfectant is useful for characterization of human CCKB/gastrin-receptor ligands.

Aneurysm of a branch of the subclavian artery with multiple arteriovenous fistulae

A rare case is reported of an 83-year-old woman with an aneurysm of a branch of the subclavian artery with multiple arteriovenous fistulae. The patient was admitted to our hospital with a pulsatile mass in the supraclavicular space and a prominent continuous murmur which radiated to the anterior chest, right forearm and right neck. She first noticed a pulsatile 2 cm mass in 1972, 1 year following a subtotal gastrectomy. At that time, she had intravenous therapy through a right neck vein. In 1993, the mass became larger, and she developed a shunt murmur. Digital subtraction angiography (DSA) demonstrated an aneurysm of the right subclavian artery and an arteriovenous fistula between the right subclavian artery and vein. The right common carotid artery and right subclavian artery arose from the aortic arch separately. The aneurysm arose from a branch of the subclavian artery which may be the costocervical trunk. The 5 x 4 cm aneurysm was resected and the arteriovenous fistula was divided. On postoperative day 5, a new murmur was ausculated. A repeat DSA detected a new fistula between the axillary artery and vein. Reoperation was performed to ligate and divide the fistula. Pathological examination revealed an atherosclerotic aneurysm.

[Methodological study of 13C-urea breath test for detection of Helicobacter pylori infection]

In this study, we investigate simple breath test for detection of Helicobacter pylori (HP) infection using 13C-urea. Thirty-nine patients (30 were HP positive, 9 were HP negative) were given three different doses (50, 100 and 150 mg) of 13C-urea at fasting, and keep sitting after mouth washing with water. Breath samples were taken before and 10, 20, 30, 45, and 60 minutes after urea administration. More than 100mg of 13C-urea was necessary for correct diagnosis of HP infection, because 2 HP positive cases were not detected by 50mg 13C-urea administration. In cases with patchy distribution of HP in the stomach, it may be necessary to change the posture to distribute urea within the whole stomach. In most of HP positive cases, peak delta 13CO2 were obtained within 30 minutes, but one HP negative case showed high delta 13CO2 at 10 minutes, which was probably caused by urease activity in the mouth. So it is appropriate to take breath sample at 20 minutes after urea administration. In this study, cut-off value for a positive test can be setted between 4 to 7 delta/1000, it is necessary to investigate much more cases to set exact cut-off value.

Substrate specificity of recombinant osteoclast-specific cathepsin K from rabbits

A cDNA clone encoding the rabbit cysteine proteinase cathepsin K, which is predominantly expressed in osteoclasts and is closely related to cathepsins L (EC 3.4.22.15) and S (EC 3.4.22.27) [Tezuka K., Tezuka Y., Maejima A., Sato T., Nemoto K., Kamioka H., Hakeda Y., Kumegawa M., J. Biol. Chem., 269, 1106 (1994)], was expressed at high levels in Escherichia coli in a T7 expression system. The insoluble recombinant enzyme was solubilized in urea and refolded at an alkaline pH. Cathepsin K (37-kDa) was purified by gel filtration and its enzymatic characteristics were determined. The enzymatic activity of cathepsin K was strongly inhibited by cysteine proteinase inhibitors and its optimal pH was pH 5.5. Synthetic substrate benzyloxycarbonyl-Phe-Arg-7-(4-methyl)coumaryl-amide, which is hydrolyzed by cathepsins L and S, was also cleaved by cathepsin K. On the other hand, benzyloxycarbonyl-Gly-Pro-Arg-7-(4-methyl)coumaryl-amide was the most suitable substrate for cathepsin K, but was hardly hydrolyzed by cathepsin L. The substrate specificity of cathepsin K, as determined using various chemogenic substrates, showed different characteristics from cathepsins L and S.

Vitamin B12 amplifies circadian phase shifts induced by a light pulse in rats

Vitamin B12 (VB12) is a putative modulator of the human circadian clock, improving entrainability to the 24 h light-dark cycle. The present study was intended to elucidate the mechanism of VB12 action in an animal model. In male rats free-running under constant dim illumination, a single light pulse of 50-1000 lux for 20 min given at circadian time (CT) 20 induced a 0.28 to 1.08 h phase advance and at CT 14 induced a 0.54 to 2.10 h phase delay. A 3 h intracerebroventricular (icv) infusion of 30 nmol VB12 starting 2 h prior to a 20 min 200 lux light pulse significantly amplified phase shifts in comparison with saline-treated or untreated controls. The mean phase advance (1.13 h) was 1.8-fold greater than that of saline-infused controls, whereas the mean phase delay (2.28 h) was 2.9-fold greater. These values were comparable to the maximal phase shifts caused by 1000 lux light pulses in untreated rats. Since the same VB12 treatment alone had failed to induce a phase shift in a previous experiment, these results indicate that VB12 strongly enhanced light pulse-induced phase shifts and thus augmented the entrainability of the circadian clock to light.

Inhibition by adrenomedullin of arginine vasopressin-activated mitogen-activated protein kinase in rat glomerular mesangial cells via cAMP production

The present study was undertaken to determine whether adrenomedullin modulates the arginine vasopressin (AVP)-activated mitogen-activated protein (MAP) kinase in cultured rat glomerular mesangial cells. AVP dose-dependently increased cellular free calcium, and this increase was unaffected by adrenomedullin. Adrenomedullin increased cellular cAMP production in a dose-dependent manner and AVP activated MAP kinase in a dose-dependent manner. When cells were preincubated for 15 min with adrenomedullin at concentrations of 1 X 10(-8) M or higher, the AVP-activated MAP kinase was significantly reduced. In addition, the activation of MAP kinase by phorbol-12-myristate-13-acetate (PMA) was significantly inhibited by adrenomedullin. Similarly, forskolin also diminished the activation of MAP kinase by AVP and PMA. The inhibition by adrenomedullin or forskolin of AVP-activated MAP kinase disappeared when cells were preexposed to H-89, an inhibitor of protein kinase A. These results indicate that adrenomedullin inhibits the AVP activation of MAP kinase mediated through cAMP in glomerular mesangial cells and that the site of action of adrenomedullin is behind the site of activation of protein kinase C.

Milk ejection bursts of supraoptic oxytocin neurones during bilateral and unilateral suckling in the rat

Extracellular recordings of the electrical activity of oxytocin neurones were made from the supraoptic nuclei (SON) of lactating rats, and the milk-ejection bursts and the background activity of oxytocin neurones were investigated during unilateral and bilateral suckling. When application of pups was limited to the nipples on either the same side (ipsilateral suckling) or the side opposite (contralateral suckling) to the oxytocin neurone recorded, the burst amplitude and background firing rate were significantly (P < 0.05) lower and the inter-burst interval was significantly (P < 0.05) longer than during bilateral suckling. Furthermore, the burst amplitude was significantly (P < 0.05) lower during ipsilateral suckling than during contralateral suckling. The majority of the oxytocin neurones showed a gradual increase in the burst amplitude during bilateral (88.9%) and contralateral (77.3%) suckling, but during ipsilateral suckling only 40% of the neurones did. The inter-burst interval became shorter with the progress of the milk ejection reflex during any mode of suckling. Three pairs of oxytocin neurones recorded simultaneously from both SON were successfully tested for the effect of bilateral and unilateral suckling on the electrical activity, and the results showed the same direction of change in the burst amplitude, background activity and burst interval as shown in single side recordings. These findings indicate that the burst amplitude mainly depends on the amount of afferent suckling signals arising from the nipples on the side opposite to the recording side, and that there may exist bilateral summation centres coordinating with the synchronization mechanism of milk-ejection bursts of oxytocin neurones.