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Matsumoto M, Takeuchi N. Effects of misestimated far-end boundary values on two common lidar inversion solutions. APPLIED OPTICS 1994; 33:6451-6456. [PMID: 20941183 DOI: 10.1364/ao.33.006451] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Solutions of the lidar equation in both the Klett [Appl. Opt. 20, 211 (1981)] and the Fernald [Appl. Opt. 23, 652 (1984)] approaches include the effect of errors in the estimated boundary value at the far end. In the present study an attempt is made to formulate the effect of the error in the boundary value on the solution of the lidar equation. Using a modified extinction coefficient, we can simplify and unify the error expression of the lidar inversion solution. From the unified error expression and numerical experiments, we found that (a) in the case of overestimation of the boundary value, the discrepancy between the estimated value and the real value decreases near the lidar more rapidly than in the case of underestimation; and (b) the error for the Fernald solution converges to zero more rapidly than the error for the Klett solution, but the convergence of the Fernald solution sometimes shows oscillatory behavior, whereas the convergence of the Klett solution is always monotonic.
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1352
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Kishida H, Hasegawa T, Iwasa Y, Koda T, Tokura Y, Tachibana H, Matsumoto M, Wada S, Lay TT, Tashiro H. Electric-field-induced second-harmonic generation mediated by one-dimensional excitons in polysilanes. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:7786-7792. [PMID: 9974764 DOI: 10.1103/physrevb.50.7786] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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1353
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Seshimo A, Aratake T, Matsumoto M, Kawase A, Kirita T, Kameoka S, Hamano K. [Intraarterial infusion combination therapy with LV and 5-FU in hepatic metastases from colorectal cancer]. Gan To Kagaku Ryoho 1994; 21:2162-4. [PMID: 7944429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Intraarterial infusion combination therapy with LV and 5-FU was performed on 8 patients with hepatic metastases from colorectal cancer. Briefly, immediately after administration of LV 30 mg/body, 5-FU was administrated in doses of 750 to 1,250 mg/body over about 2 hours. The therapy was repeated at every weekly visit to the clinic. The number of courses per patient averaged 22. The response rate was 50% (4 PR). Clinical responses were obtained 6 months on average. The 50% survival period was 300 days. Five patients died, 3 due to metastases to other sites. This therapy on an out-patient basis could be continued in all but one patient who was withdrawn from the treatment because of leucopenia. The results of this study suggest that this combination therapy is effective for hepatic metastasis from colorectal cancer.
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1354
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Togashi H, Matsumoto M, Yoshioka M, Hirokami M, Tochihara M, Saito H. Acetylcholine measurement of cerebrospinal fluid by in vivo microdialysis in freely moving rats. JAPANESE JOURNAL OF PHARMACOLOGY 1994; 66:67-74. [PMID: 7861669 DOI: 10.1254/jjp.66.67] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Acetylcholine (ACh) and choline (Ch) levels in rat cerebrospinal fluid (CSF) were determined by in vivo microdialysis (CSF microdialysis) in both halothane-anesthetized and freely-moving rats. The Ch/ACh ratio in CSF perfused with Ringer's solution (30 microliters/30 min) containing 10(-5) M physostigmine, a centrally active cholinesterase inhibitor, was significantly lower than that in unprocessed CSF due to significantly higher ACh levels in the former. The successive measurement on the 2nd and 7th day after the guide cannula implantation demonstrated the feasibility of the CSF microdialysis method for repetitive monitoring of CSF ACh and Ch levels in freely moving rats without extensive tissue damage. Intraperitoneal administration of physostigmine caused an increase in CSF ACh levels, whereas administration of neostigmine, which cannot penetrate into the blood brain barrier, did not. Furthermore, a centrally active acetylcholinergic M1-receptor agonist, AF102B, produced an increase in CSF ACh and Ch levels. Thus, the present study demonstrates that CSF microdialysis is a useful method for evaluating overall central cholinergic activity and investigating the pharmacological effects of various drugs that act via the central cholinergic system.
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1355
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Okubo K, Miyasaka K, Matsumoto M, Funakoshi A. Mechanisms of stimulatory effect of neuromedin C on pancreatic exocrine secretion in conscious rats. Pancreas 1994; 9:585-90. [PMID: 7809013 DOI: 10.1097/00006676-199409000-00008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The mechanisms of the stimulatory effect of the bombesin-like peptide neuromedin C on pancreatic exocrine secretion were examined in conscious rats. Rats were prepared with cannulae draining bile and pancreatic juice separately. Intravenous infusion of 0.35 nmol/kg/h of neuromedin C significantly increased the secretions of pancreatic bicarbonate and protein, and transiently increased the plasma cholecystokinin (CCK) concentration. The increase in pancreatic secretion persisted for 90 min, whereas the increase in plasma CCK was observed only after 15 and 30 min from the beginning of neuromedin C infusion. Intravenous infusion of CR-1409, a specific CCK-receptor antagonist, inhibited, but did not abolish, the protein secretion stimulated by neuromedin C. Intraduodenal infusion of a potent proton pump inhibitor, omeprazole, suppressed, but did not abolish, protein secretion induced by neuromedin C. Omeprazole abolished the increase in bicarbonate secretion produced by neuromedin C. These results indicate that neuromedin C induces release of CCK and that its induction of pancreatic hypersecretion is due to both its direct effect and CCK. The results also suggest that gastric hypersecretion may have a role in the bicarbonate hypersecretion induced by neuromedin C.
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1356
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Deng YB, Matsumoto M, Wang XF, Liu L, Takizawa S, Takekoshi N, Shimizu T, Mishima K. Estimation of mitral valve area in patients with mitral stenosis by the flow convergence region method: selection of aliasing velocity. J Am Coll Cardiol 1994; 24:683-9. [PMID: 8077539 DOI: 10.1016/0735-1097(94)90015-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
OBJECTIVES We attempted to determine the most suitable aliasing velocity for applying the hemispheric flow convergence equation to calculate the mitral valve area in mitral stenosis using a continuity equation. BACKGROUND The flow convergence region method has been used for calculating mitral valve area in patients with mitral stenosis. However, the effect of varying aliasing velocity on the accuracy of this method has not been investigated fully. METHODS We studied 42 patients with mitral stenosis using imaging and Doppler echocardiography. Aliasing velocities of 17, 21, 28, 34, 40 and 45 cm/s were used. The transmitral maximal flow rate (Q [ml/s]) was calculated using the hemispheric flow convergence equation Q = 2 x pi x R2 x AV x alpha/180, where R (cm) is the maximal radius of the flow convergence region, AV is the aliasing velocity, and alpha/180 is a factor accounting for the inflow angle (alpha). Mitral valve area (A [cm2]) was calculated according to the continuity equation A = Q/V, where V (cm/s) is the peak transmitral velocity by the continuous wave Doppler method. RESULTS Mitral valve area was progressively underestimated with increasing aliasing velocity. The actual and percent differences noted between the mitral valve area by the flow convergence region method and that by two-dimensional echocardiographic planimetry were -0.06 +/- 0.23 cm2 (mean +/- SD) and 0.09 +/- 15.7% at an aliasing velocity of 21 cm/s, increasing gradually with increasing aliasing velocity, and were -1.24 +/- 0.9 cm2 and -72.56 +/- 16.4% at an aliasing velocity of 45 cm/s. Mitral valve areas estimated by the flow convergence region method at an aliasing velocity of 21 cm/s in 11 patients with associated > 2+ mitral regurgitation (2.12 +/- 1.17 cm2) and 8 with associated > 2+ aortic regurgitation (1.28 +/- 0.71 cm2) were not significantly different using planimetry (2.24 +/- 1.39 cm2, p > 0.05 and 1.27 +/- 0.74 cm2, p > 0.05, respectively) but were significantly different by the pressure half-time method (1.59 +/- 1.12 cm2, p < 0.001 and 1.63 +/- 0.93 cm2, p < 0.01, respectively). CONCLUSIONS This study indicated the most appropriate aliasing velocity for the accurate estimation of mitral valve area in patients with mitral stenosis.
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1357
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Mandai K, Sueyoshi K, Fukunaga R, Nukada M, Tsukaguchi I, Matsumoto M, Kamada T. Evaluation of cerebral vasoreactivity by three-dimensional time-of-flight magnetic resonance angiography. Stroke 1994; 25:1807-11. [PMID: 8073461 DOI: 10.1161/01.str.25.9.1807] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
BACKGROUND AND PURPOSE Cerebral vasoreactivity is an important indicator of the reserve capacity of the cerebral circulation. To make a quantitative analysis of cerebral vasoreactivity in individual major arterial territories, we evaluated the response to acetazolamide using three-dimensional time-of-flight magnetic resonance angiography. METHODS We examined 10 healthy volunteers and 6 patients with unilateral stenosis of the middle cerebral artery by a 1.5-T superconducting magnetic resonance imaging system. After a baseline vascular image was obtained, each subject received 17 mg/kg IV of acetazolamide; a second scan was performed 20 minutes later. Using a generally available personal computer and image analysis software, we measured the areas of the individual major arteries on collapsed axial vascular images and then calculated the vasoreactivity. RESULTS The average vasoreactivity of individual major cerebral arterial territories in the healthy volunteers was as follows: anterior cerebral artery complex, 33%; right middle cerebral artery, 71%; left middle cerebral artery, 74%; right posterior cerebral artery, 68%; and left posterior cerebral artery, 68%. In the patient group, the vasoreactivity of the stenotic middle cerebral arteries was significantly smaller than that of the nonstenotic arteries (P < .05). In addition, the nonstenotic middle cerebral arteries showed significantly less vasoreactivity than the right arteries of the healthy volunteers (P < .01). CONCLUSIONS Three-dimensional time-of-flight magnetic resonance angiography can be used to quantitatively evaluate acetazolamide-induced vasoreactivity in individual major cerebral arterial territories.
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1358
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Miyahara T, Harada M, Kondo S, Komiyama H, Matsuda S, Miyanishi A, Matsumoto M, Xue-Ya W, Ikemoto Y, Sugure A. Calcium regulating activity of 26,27-dimethyl analog of 24R,25-dihydroxyvitamin D3. Calcif Tissue Int 1994; 55:190-7. [PMID: 7987732 DOI: 10.1007/bf00425874] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
To determine the possibility that methyl substitution in 26- and 27-positions of 24R,25-dihydroxyvitamin D3 [24,25(OH)2D3] alters activities of the original compound, the effects of 24,25(OH)2D3 on calcium (Ca) regulating activity were compared with those of its methyl analog [24,25(OH)2(CH3)2D3] in addition to 1 alpha,25-dihydroxyvitamin D3 [1,25(OH)2D3]. 24,25(OH)2D3 at 10(-6) M and 24,25(OH)2(CH3)2D3 at 10(-7) M and above significantly stimulated both bone resorption in neonatal mouse calvaria cultures and formation of osteoclast-like multinucleated cells (MNC) in mouse bone marrow cultures. A stimulative effect of 1,25(OH)2D3 on bone resorption and MNC formation was recognized in very low concentrations (10(-11) M and above). Although a potency of 24,25(OH)2(CH3)2D3 in stimulating bone calcium (Ca) mobilization and intestinal Ca transport was higher than that of 24,25(OH)2D3, the potencies of both compounds were similar to that of 1,25(OH)2D3 unlike in vitro experiments. As 1,24R,25-trihydroxy-26,27-dimethylvitamin D3 showed almost the same effect as 24,25(OH)2(CH3)2D3, the dihydroxy form is suggested to be hydroxylated at 1 alpha position and converted to trihydroxy form in vitamin D-deficient rats. From these results, methyl substitution in 26- and 27-position of 24,25(OH)2D3 was found to elevate Ca regulating activity of the original compound. In addition, it is suggested that the basis for a similarity in potency between 1,25(OH)2D3 and 24,25(OH)2D3 or its dimethyl analog in vitamin D-deficient rats is likely the result of 1 alpha-hydroxylation.
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1359
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Kuroki T, Matsumoto M, Kushida T, Ohtsuka T, Uchino M, Nishikawa H. [Nontraumatic subdural hematoma secondary to dural metastasis of lung cancer: case report and review of the literature]. NO SHINKEI GEKA. NEUROLOGICAL SURGERY 1994; 22:857-62. [PMID: 8090269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
In this paper, a case of nontraumatic subdural hematoma secondary to dural metastasis of lung cancer was presented and 43 cases in the literature were reviewed. A 75-year-old man who had been affected with lung tuberculosis for the previous 7 years was admitted to our hospital because of right hemiparesis and aphasia. No history of head injury was discovered. On admission, he was fully conscious and no other neurological abnormalities were noticed except for right hemiparesis and motor aphasia. The chest X-ray revealed abnormal shadows on the right lung, which were most suggestive of tuberculosis. Laboratory studies including prothrombin time, platelet count and fibrinogen were normal. The CT scans taken at that time demonstrated a large subdural hematoma over the left hemisphere. Under a diagnosis of chronic subdural hematoma, emergency evacuation through a small burr hole was performed. However, because of its low liquidity, the hematoma was insufficiently removed. Postoperatively, hemiparesis gradually disappeared. On the 20th hospital day, he suddenly became unconscious and CT scans showed recurrence of the subdural hematoma. Temporo-parietal craniotomy was immediately carried out. The dura was thickened and hyperemic. Although the underlying brain was apparently normal, the exploration performed after removal of the hematoma revealed a soft grayish mass extruding into the subdural space from the dura. The bleeding point was not identified. Both the dura and the abnormal tissue were biopsied for histological examination.(ABSTRACT TRUNCATED AT 250 WORDS)
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1360
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Misawa S, Aoshima M, Takaku H, Matsumoto M, Hayashi H. High-level expression of Mycoplasma arginine deiminase in Escherichia coli and its efficient renaturation as an anti-tumor enzyme. J Biotechnol 1994; 36:145-55. [PMID: 7765234 DOI: 10.1016/0168-1656(94)90050-7] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The arginine deiminase (AD) gene was cloned from Mycoplasma arginini and expressed in the cytosol of Escherichia coli as inclusion bodies with an expression level of at least 20% of the total bacterial proteins. The inclusion bodies were solubilized with 6 M guanidine hydrochloride (Gdn-HCl) under reducing conditions, in order to avoid incorrect disulfide-bond formation of the recombinant (r-) AD molecules, and renaturation was performed under various refolding conditions. The optimum renaturation conditions were found to be incubation for 90 h at pH 7.5 and 15 degrees C. The resulting completely refolded r-AD was purified to homogeneity by anion-exchange and arginine-affinity chromatography and its activity yield was 72.5%. The specific activity of the purified r-AD was comparable to and its amino acid composition was identical to those of Mycoplasma AD, and NH2-terminal sequence analysis revealed that its methionine residue corresponding to the translation initiation codon had been removed completely. Anti-tumor activity analyses showed that r-AD inhibited the growth of two mouse cell lines, hepatoma MH134 and fibrosarcoma Meth A, strongly in vitro at concentrations in excess of 10 ng ml-1. Moreover, when MH134-implanted mice were given single intravenous injections of r-AD at doses of 50 mg kg-1 and higher, their survival times were prolonged significantly. These results, taken together, indicate that the enzymatic properties and biological actions of r-AD were highly consistent with those of Mycoplasma AD.
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1361
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Nishikawa J, Kitaura M, Matsumoto M, Imagawa M, Nishihara T. Difference and similarity of DNA sequence recognized by VDR homodimer and VDR/RXR heterodimer. Nucleic Acids Res 1994; 22:2902-7. [PMID: 8065900 PMCID: PMC310253 DOI: 10.1093/nar/22.15.2902] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Nuclear receptors for the thyroid hormone and vitamin A and D cooperate with the retinoid X receptor (RXR) in activating the transcription. Although the hormone response elements for these receptors have been proposed in which spacing of the direct repeated motifs determine the specificity (so called 3-4-5 rule), vitamin D response elements (VDREs) in the natural context consist of often imperfect direct repeats. Vitamin D receptor (VDR) alone can bind to the mouse osteopontin (mSPP-1) VDRE, which contains a direct repeat separated by 3 nucleotides, but not to the rat osteocalcin (rOST) VDRE having inexact direct repeat. The presence of RXR not only allows the VDR to bind to the rOST VDRE, but also increases the binding affinity for the mSPP-1 VDRE. The RXR/VDR heterodimer exhibits the similar affinity constants for the mSPP-1 VDRE and the rOST VDRE, in spite of the apparently different affinities for two VDREs of the VDR homodimer. A random oligonucleotide selection procedure revealed that the consensus sequence selected by the RXR homodimer is the direct repeat spaced by one A residue. In contrast, the sequences preferentially selected by the VDR homodimer and the VDR/RXR heterodimer are similar, which are the direct repeats spaced by 3 nucleotides. The difference and similarity of DNA sequence recognition are discussed.
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1362
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Taira Z, Matsumoto M, Ishida S, Ichikawa T, Sakiya Y. Aggregation of DNA enhanced by the protoberberine alkaloids, coralyne and berberine. Chem Pharm Bull (Tokyo) 1994; 42:1556-61. [PMID: 7954909 DOI: 10.1248/cpb.42.1556] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The aggregation of DNA caused by coralyne was studied by spectroscopic, viscosity and electric birefringence measurements. Aggregation was markedly enhanced over a narrow range of coralyne to DNA phosphate ratio and then followed by precipitation. The electric birefringence measurements indicated that the ratio at the maximal aggregation varied depending on the concentration of coralyne, finally reaching 1:1 at higher concentrations. The particles (type I) for such enhanced aggregation were estimated to be prolate ellipsoids 1700-4000 A in length with a diameter of 1400-4000 A. At higher coralyne concentrations, another particle (type II) was formed which was a thick rod-like particle 1700-4000 A in length with a diameter of 120-210 A. These dimensions indicate that type I and II particles consist respectively of several tens of thousands and some hundreds of molecules of DNA. On the other hand, berberine did not produce such a marked aggregation of DNA, and the result was a thick rod-like particle 1700-4000 A in length with a diameter of 300-1000 A. The enhancement by coralyne and berberine is discussed in terms of intermolecular interactions.
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1363
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Matsumoto M, Deng YB, Takekoshi N, Watanabe F. [Two-dimensional echocardiographic assessment of myocardial infarct size and viability and the prediction of clinical course in acute myocardial infarction]. NIHON RINSHO. JAPANESE JOURNAL OF CLINICAL MEDICINE 1994; 52 Suppl:614-20. [PMID: 12440034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
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1364
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Sakiyama H, Inaba N, Toyoguchi T, Okada Y, Matsumoto M, Moriya H, Ohtsu H. Immunolocalization of complement C1s and matrix metalloproteinase 9 (92kDa gelatinase/type IV collagenase) in the primary ossification center of the human femur. Cell Tissue Res 1994; 277:239-45. [PMID: 8082118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The first component of complement C1s has been shown to degrade type I and type II collagens (Yamaguchi et al. 1990), the latter of which is a major constituent of the cartilage matrix. In order to understand the physiological roles of C1s in cartilage resorption, the expression of C1s was examined by immunohistochemistry in the primary ossification center where the matrix is removed and replaced by bone marrow. Hypertrophic chondrocytes, endothelium and hematogenous elements in the capillary buds were intensely stained by a monoclonal antibody against C1s. Matrix metalloproteinase 9 (MMP-9, 92kDa gelatinase/type IV collagenase) was also immunolocalized in hypertrophic chondrocytes, mesenchymal cells in the primitive bone marrow and the cartilage matrix adjacent to the marrow. In addition, C1s was found to activate the zymogen of MMP-9. These observations suggest that C1s and MMP-9 coordinately participate in matrix degradation in cartilage.
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1365
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Yamano Y, Matsumoto M, Inoue K, Kawabata T, Morishima I. Cloning of cDNAs for cecropins A and B, and expression of the genes in the silkworm, Bombyx mori. Biosci Biotechnol Biochem 1994; 58:1476-8. [PMID: 7765280 DOI: 10.1271/bbb.58.1476] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
cDNA clones coding cecropins A and B were isolated from a cDNA library constructed from the fat body of immunized Bombyx mori larvae. The cloned cDNAs had an open reading frame of 63 amino acids, indicating the primary translated peptides were processed to form mature cecropins of 35 amino acid residues. The homology in the coding regions of cecropins A and B was 73%. In immunized fat body, the expression of both cecropin A and B genes reached the maximal level 5 h after the injection of soluble peptidoglycan, and the high level was maintained until 9 h after immunization. The cecropin A and B genes were expressed at high levels in fat body and hemocytes, at lower but significant levels in malpighian tube, slightly in midgut, and none in silk gland.
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1366
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Tange Y, Matsumoto M, Okada T, Hasegawa H, Kobayashi Y. Detection of DNA of causative agent of spotted fever group rickettsiosis in Japan from the patient's blood sample by polymerase chain reaction. Microbiol Immunol 1994; 38:665-8. [PMID: 7799840 DOI: 10.1111/j.1348-0421.1994.tb01837.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The polymerase chain reaction (PCR) was applied for the etiological diagnosis of spotted fever group (SFG) rickettsiosis in Japan. Nucleotide primers derived from the 17-kDa antigen gene of Rickettsia rickettsii primed a rickettsia-specific 246-base-pair product for all of the Katayama, Abe, Misaka and Kojima strains, which we had isolated previously. Moreover, we were able to detect the same product by PCR amplification from the peripheral blood of a patient in the acute stage of the illness. The PCR method is considered to be useful for rapid etiological diagnosis of SFG rickettsiosis in Japan.
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1367
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Suzuki S, Hinokio Y, Hirai S, Onoda M, Matsumoto M, Ohtomo M, Kawasaki H, Satoh Y, Akai H, Abe K. Pancreatic beta-cell secretory defect associated with mitochondrial point mutation of the tRNA(LEU(UUR)) gene: a study in seven families with mitochondrial encephalomyopathy, lactic acidosis and stroke-like episodes (MELAS). Diabetologia 1994; 37:818-25. [PMID: 7988784 DOI: 10.1007/bf00404339] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Recent evidence suggests possible linkage between diabetes mellitus and mitochondrial gene mutation. We surveyed mitochondrial tRNA(LEU(UUR)) (3243) mutation in 7 mitochondrial encephalomyopathy, lactic acidosis and stroke-like episode (MELAS) families and identified 24 mutated subjects (7 MELAS probands and 17 non-MELAS relatives) as well as 11 non-mutant family members. An OGTT in the 24 mutant relatives revealed 14 diabetic subjects, 3 with impaired glucose tolerance and 7 with normal glucose tolerance and all non-mutant family members as having normal glucose tolerance. Insulinogenic index was significantly reduced in the mutant diabetic subjects and those with impaired and normal glucose tolerance in comparison with the normal control subjects and the non-mutant members. Urinary 24-h C-peptide immunoreactivity excretion was markedly reduced in the mutant diabetic subjects and those with normal and impaired glucose tolerance, compared with the control subjects and the non-mutant family members. Plasma C-peptide immunoreactivity 6 min after glucagon injection was markedly reduced in the mutant diabetic subjects and those with normal and impaired glucose tolerance compared with the control subjects and the non-mutant family members. Si, an index of insulin sensitivity of the four mutant subjects was within normal range. Islet cell antibodies were negative in sera of eight mutated diabetic subjects, 2 and 6 with impaired and normal glucose tolerance, respectively. Diabetic retinopathy and nephropathy were demonstrated in 7 (50%) and 12 (85.7%) of 14 mutant diabetic subjects, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
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1368
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Konishi Y, Matsumoto M, Yuasa S, Miwa T, Nishizawa J. [Right ventricular function after aorto-coronary bypass surgery: with relation to the site of right coronary artery occlusion]. KYOBU GEKA. THE JAPANESE JOURNAL OF THORACIC SURGERY 1994; 47:705-8. [PMID: 8057553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Postoperative right ventricular function was evaluated serially by thermodilution techniques (REF-1, Edwards Laboratories) in patients who underwent aorto-coronary bypass surgery with uneventful postoperative recovery. The patients were divided into three groups depending on the location of critical stenosis of the right coronary artery. The stenosis was proximal to the right ventricular branch in group I (n = 13), distal to the right ventricular branch but proximal to the acute marginal branch in group II (n = 13) and distal to the acute marginal branch in group III (n = 11). Control (n = 20) consisted of the patients with no significant stenosis of the right coronary artery. Cardiac index, intracardiac pressures and amount of cathecolamin used during postoperative course showed no significant differences among the groups including control. With the use of cathecolamine after surgery, right ventricular ejection fraction (RVEF) rose and right ventricular volumes (RVEDV and RVESV) decreased in all the groups except for group I. These values in group I were unchanged. Thus, there were significant differences in RVEF, RVEDV and RVESV between group I and control. These results mean that right ventricular dysfunction may remain even long after occlusion of the proximal right coronary artery.
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1369
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Wake M, Matsushita M, Aono H, Matsumoto M, Kohri Y. [Perioperative management of a patient with myotonic dystrophy developing the cardiac symptoms initially prior to the neuromuscular symptoms]. MASUI. THE JAPANESE JOURNAL OF ANESTHESIOLOGY 1994; 43:1238-42. [PMID: 7933510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The authors anesthetized a 48-year-old woman with endometrial cancer and a large ovarian cyst. She developed cardiac failure initially followed by the sick sinus syndrome and A-V block from hypertrophic cardiomyopathy, prior to neuromuscular symptoms. Epidural anesthesia assisted by general anesthesia was carried out safely without intravenous administration of any muscle relaxants. From this experience, it is considered that epidural anesthesia assisted with some other proper methods is suitable for surgery of lower abdomen.
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Matsumoto M, Hasegawa A, Kodama Y. Adiabatic amplification of solitons by means of nonlinear amplifying loop mirrors. OPTICS LETTERS 1994; 19:1019-1021. [PMID: 19844519 DOI: 10.1364/ol.19.001019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We study the transmission properties of a nonlinear amplifying loop mirror that acts as an adiabatic amplifier of solitons. The adiabatic nature of the operation is quantified by evaluation of the energy and the Hamiltonian of dispersive-wave components contained in the output pulse. Near-adiabatic amplification is possible, and a chirp-free solition can be generated with an amplification ratio (compression ratio) of ~2 by a proper design of the device.
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1371
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Takeba K, Itoh T, Matsumoto M, Nakazawa H. Determination of dephosphate bromofenofos in milk by liquid chromatography with electrochemical detection. J AOAC Int 1994; 77:904-8. [PMID: 8069121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A sensitive, specific method for the determination of dephosphate bromofenofos (DBFF) in milk by liquid chromatography (LC) with electrochemical detection is described. DBFF, the only metabolite of bromofenofos (BFF, a fasciolicide), was extracted from milk by liquid-liquid partition with acetone, acetonitrile, and dichloromethane and purified by using a C18 cartridge. The compound was separated from the matrix peaks by reversed-phase LC and detected by dual-electrode coulometric detection on a Kaseisorb LC ODS-300-5 (250 x 4.6 mm id, 5 microns) column. The mobile phase was acetonitrile-0.05M potassium dihydrogen phosphate (55 + 45, v/v) at pH 3.0. The flow rate was 1 mL/min at 40 degrees C. The applied potentials of detectors 1 and 2 were maintained at 0.30 and 0.45 V, respectively. Average recoveries (n = 5) of DBFF from milk spiked at 1 and 10 ng/mL were 73.1 and 82.7%, respectively; and coefficients of variation were 8.4 and 2.8%, respectively. The detection limit of DBFF in milk was 0.2 ng/mL. Fifty-nine raw and 181 commercial milks were analyzed. DBFF was detected in 4 raw milks (0.2-1.5 ng/mL; average, 0.6 ng/mL) and in 3 normal liquid commercial milks (0.3-0.7 ng/mL; average, 0.5 ng/mL). The identity of DBFF from milk was confirmed by gas chromatography/mass spectrometry.
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1372
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Hashikawa K, Matsumoto M, Moriwaki H, Oku N, Okazaki Y, Uehara T, Handa N, Kusuoka H, Kamada T, Nishimura T. Split dose iodine-123-IMP SPECT: sequential quantitative regional cerebral blood flow change with pharmacological intervention. J Nucl Med 1994; 35:1226-33. [PMID: 8014687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
UNLABELLED At least two quantitative rCBF measurements are needed to evaluate rCBF changes with pharmacological intervention. We have developed the split dose 123I-IMP SPECT method, which enables measurement of rCBF to be repeated in a short time. METHODS Thirty-one cerebrovascular disease patients were investigated to assess reproducibility and vasoreactivity to acetazolamide. During 44-min dynamic SPECT imaging, 123I-IMP injection and respective arterial sampling were performed twice at an interval of about 25 min. The rCBF values were calculated using a microsphere model in which the washout of 123I-IMP from the brain can be negligible in the first several minutes after injection. For the second rCBF measurement, the remaining activity due to the first 123I-IMP injection was estimated and subtracted from the total brain activity. RESULTS In ten patients, two consecutive resting mean rCBF values in the MCA territory (CBF1 and CBF2) had good correlation (CBF1 = 47.4 +/- 4.0 (ml/min/100 ml: mean +/- s.d.), CBF2 = 45.2 +/- 8.2, CBF2 = 0.900*CBF1 + 2.9, r = 0.915). In 11 patients with occlusive lesions in the unilateral ICA system, mean rCBF in the MCA territory was increased by only 27.7% +/- 14.0% in the affected side by a 1-g intravenous acetazolamide injection, while 44.5% +/- 12.3% increase was found in the nonaffected side. In 10 patients without a major arterial lesion, a 49.7% +/- 17.0% increase of rCBF was demonstrated. CONCLUSIONS This split dose method 123I-IMP SPECT can be useful to estimate vascular reserve.
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1373
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Tsushima Y, Matsumoto M, Endo K, Aihara T, Nakajima T. Characteristic bright signal of parotid pleomorphic adenomas on T2-weighted MR images with pathological correlation. Clin Radiol 1994; 49:485-9. [PMID: 8088045 DOI: 10.1016/s0009-9260(05)81748-9] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The purpose of this study was to correlate the MR features and histological findings of pleomorphic adenomas, which are the most common tumour of the parotid gland, and to distinguish them from other types of tumour in the parotid gland. The materials studied consisted of 20 pleomorphic adenomas, including 12 untreated and eight recurrent cases, 17 other benign parotid tumours, and 12 malignant tumours. T1- and T2-weighted images and Gd-DTPA enhanced T1-weighted images were obtained. Characteristic bright signals with a higher intensity than that of CSF were seen in all of the pleomorphic adenomas on T2-weighted images, and were found to represent myxoid areas histologically. Although the cystic spaces in some benign tumours produced bright signals, these areas were distinguished from myxoid areas due to nonenhancement with Gd-DTPA. No bright signals were seen in the malignant tumours. In conclusion, bright signals on T2-weighted images represent myxoid tissue and are useful findings for diagnosing pleomorphic adenomas.
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1374
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Hara T, Fukuda H, Masaoka T, Matsumoto M, Seya T. Development of an ELISA assay for soluble CD35 (C3b/C4b receptor): high levels of soluble CD35 in LE-positive patients with hematological malignancies. Immunol Lett 1994; 41:249-53. [PMID: 8002046 DOI: 10.1016/0165-2478(94)90141-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Malignant cells usually lack CD35 (complement receptor type 1, C3b/C4b receptor), a differentiation surface antigen. We measured soluble forms of CD35 in the plasma of normal subjects and patients with various malignant diseases. A microassay for the determination of CD35 was established based on a sandwich enzyme immunoassay using 2 monoclonal antibodies that recognize different epitopes. Soluble CD35 was not detected in any plasma samples from normal subjects or from patients with a variety of solid cancers: i.e., levels were below 20 ng/ml. On the other hand, 3 of 70 patients with hematological malignancies showed high levels of plasma CD35. The molecular mass of the soluble form was about 200 kDa, which is similar in size to membrane forms of CD35. Although the clinical conditions differed in these patients, they had high transaminase titers and detectable autoantibody. Complement titers (CH50) and the levels of membrane complement regulatory proteins were within the normal range in these patients. Although the mechanism by which it is produced remains unknown, soluble CD35 is present in significant amounts in association with immunological disorders secondary to hematological malignancies.
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1375
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Kubota H, Ozaki Y, Matsumoto M, Kanamori H. Experimental separation of diagnostic X-ray spectra into scatter and primary components. Med Biol Eng Comput 1994; 32:468-72. [PMID: 7967818 DOI: 10.1007/bf02524705] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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