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Biomedical subjects

H Morita

Publications and source records attributed to H Morita.

At least 19 recordsLinked to original sources
PubMed1992

[Arthritis and polyenthesitis after viral pleuro-pneumopathy due to Coxsackie virus].

A sixty-one year-old male developed subacute polyenthesitis one month after the onset on pleuropulmonary disease. This last manifestation resolved completely six months later, whereas the enthesopathy ran a subacute course, improving over time. Three years after onset, the patient had monoarthritis of the left elbow and tendinitis of both Achilles tendons. During the course of the disease, neutralizing antibodies against Coxsackie virus A9 rose significantly then returned to normal when clinical manifestations improved. This finding suggests that viral infections may cause enthesopathy.

Arthritis↗
PubMed1992

Glutathione-binding proteins identified by monoclonal antibodies which depress the behavioral response evoked by glutathione in Hydra.

Hydra shows at least 5 components of the behavioral response (R1-R5) which are evoked at different concentrations of S-methylglutathione (GSM). We have prepared several monoclonal antibodies (mAbs), each of which depressed specific responses and visualized specific structures. In this paper, we analyzed molecules participating in the signaling pathway of R5 response with use of three mAbs (J245, J5 and J5/1), all of which depressed the response. A behavioral analysis of the response in the presence of mixtures of these mAbs suggested that J245 and J5 both acted on a component of the receptor-effector system which was not affected by J5/1. Correspondingly, an immunoblotting analysis showed two 220 kDa proteins which reacted with both J245 and J5 but not with J5/1. ELISA analyses also showed that the J245 antigens formed only a portion of the J5 antigens. A labeled major peak was found in the 220 kDa protein fraction by gel permeation HPLC after immunoprecipitation of the J245 antigen photolabeled with [35S]-S-(p-azidophenacyl)-glutathione. Competition of the photolabeling by the ligands GSM and L-glutamate (a competitive inhibitor of the R5 response) indicated dissociation constants for their binding to the protein of 55 and 90 microM, respectively. These values were consistent with those expected from behavioral experiments. The 220 kDa proteins therefore appear to be candidates for the receptor molecules mediating R5.

Affinity Labels↗
PubMed1992

Increased production of endothelin-1 in patients with inflammatory arthritides.

OBJECTIVE: Endothelin-1 (ET-1) is a potent vasoconstrictive peptide, but its precise mechanism of action in vivo has remained unknown. METHODS: We measured ET-1 activity by radioimmunoassay, in both plasma and synovial fluid from patients with inflammatory arthritides. RESULTS: ET-1-like immunoreactivity was found in synovial fluid, at levels severalfold higher than those in plasma. Reverse-phase high-performance liquid chromatography showed an elution profile corresponding to actual ET-1. A single class of high-affinity binding sites for ET-1 in cultured synovial cells was also detected. Furthermore, ET-1 induced mild DNA synthesis in synovial cells. CONCLUSION: Taken together, these results indicate that ET-1 might contribute to the synovial proliferation seen in inflammatory arthritides, in an autocrine/paracrine manner.

Adult↗
PubMed1992

Renojejunal reflex controlling jejunal absorption of fluid and NaCl.

The aim of this study was to elucidate renojejunal reflex controlling the net jejunal fluid, Na+, and Cl- absorption in response to an increased ureteropelvic pressure (UPP) in anesthetized dogs. Unilateral UPP was increased under hydrostatic pressure from 0 to 80 mmHg by a step of 20 mmHg in random order, while the contralateral UPP was maintained at around 0 mmHg. The net absorption of fluid, Na+, and Cl- decreased in proportion to increased UPP. At a UPP of 0 mmHg, the net jejunal fluid, Na+, and Cl- absorption were 11.1 +/- 0.4 ml, 2.48 +/- 0.07, and 1.98 +/- 0.05 mEq, and significantly decreased to 7.38 +/- 0.6 ml, 2.11 +/- 0.15, and 1.68 +/- 0.13 mEq by an increase of UPP to 40 mmHg, respectively. An increase of bilateral UPP up to 40 mmHg or more occlusively depressed the absorption. These responses were blocked by renal denervation and by administration of atropine but not by yohimbine. These results indicate that the increase of UPP decreases jejunal fluid, Na+, and Cl- absorption (renojejunal reflex), and that the afferent and efferent limbs of this reflex are the renal nerves and cholinergic fibers. This renojejunal reflex might play an important role in body fluid homeostasis under the pathological condition.

Animals↗
PubMed1992

Studies on antimutagenic effect of milk cultured with lactic acid bacteria on the Trp-P2-induced mutagenicity to TA98 strain of Salmonella typhimurium.

The inhibitory effects of cultured milk using 76 strains of lactic acid bacteria isolated from milk products were investigated on the mutagenicity of 3-amino-1-methyl-5H-pyrido[4,3-b]indole (Trp-P2), a tryptophan pyrolysate for Salmonella typhimurium TA98. Each cultured milk sample displayed its characteristic antimutagenic effect against the mutagenicity of Trp-P2. The milk cultured with Lactobacillus acidophilus LA106 (LA2) showed the highest inhibition of 82.1% among the strains used. Milk samples cultured with Lactococcus lactis subsp. lactis, Lll103 (10-3) and Lll102 (KM) also exhibited higher inhibition percentages.

Animals↗
PubMed1992

Spinal cord sarcoidosis: MRI findings in response to treatment.

The unusual case of a 64-year-old female with sarcoidosis involving the spinal cord is reported. Diffuse swelling of the cord with nodular lesions was observed on MRI. The lesions showed a low intensity area on the T1-weighted image. Following the administration of gadolinium-diethylenetriamine pentaacetic acid, the spinal cord, especially the nodular lesions, was diffusely enhanced. Serum levels of anti-endothelial cell antibodies and antinuclear antibodies were elevated. The diagnosis was confirmed by transbronchial lung biopsy which revealed noncaseating granulomas with giant epithelioid cells. The administration of prednisolone, 40 mg/day for 4 weeks, induced a remission.

Autoantibodies↗
PubMed1992

Induction of irreversible glomerulosclerosis in the rat by repeated injections of a monoclonal anti-Thy-1.1 antibody.

The present experiment demonstrated that an irreversible glomerulosclerosis could be induced in the rat through repeated intravenous administrations of OX-7 (a monoclonal anti-Thy-1.1 antibody). Rats were injected with 0.2 mg of affinity-purified OX-7 at 1-week intervals for a period of 4 weeks. Glomerular damage was periodically examined at light-microscopic level. Thirty-five days after the initial injection (7 days after the final injection), capillary aneurysms and expansion of the mesangial areas with hypercellularity were frequently observed. Similar glomerular damage was also observed in rats 7 days after they received a single injection of either 1.0 or 0.2 mg of OX-7. After repeated injections, 112 days from the initial administration (84 days after the final injection), approximately 60% of the glomeruli had expanded mesangial areas with an apparent increase in the mesangial matrix. The result contrasts sharply with that obtained from a single injection of OX-7 in that more than 85% of the glomeruli showed no abnormalities 84 days after the injection. This chronic model, as a result of repeated injections of the antibody, could serve as a potential for further investigation of the mechanisms involved in the development of chronic glomerulonephritis.

Animals↗
PubMed1992

Progressive supranuclear palsy-like syndrome in two siblings of a consanguineous marriage.

Two siblings of a consanguineous marriage showed identical clinical features consisting of supranuclear vertical ophthalmoplegia, bradykinesia, rigidity, stooped posture, pseudobulbar palsy, and dementia, all beginning in the sixth decade. There was no history of encephalitis or of exposure to known chemicals. L-Dopa therapy was only partially and temporarily effective. Autopsy of one patient revealed extensive neurofibrillary degeneration with prominent involvement of the limbic system. There were no senile plaques or Lewy bodies. Under electron microscopy, there were paired helical filaments as well as 15-nm-wide straight tubules. The diffuse appearance of neurofibrillary tangles, predominant in the limbic system, and familial occurrence are unusual in progressive supranuclear palsy; these cases may, therefore, constitute a different, distinctive clinicopathologic disease.

Consanguinity↗
PubMed1992

Solution forms of an antitumor cyclic hexapeptide, RA-VII in dimethyl sulfoxide-d6 from nuclear magnetic resonance studies.

Using high-resolution proton nuclear magnetic resonance (1H-NMR) and carbon-13 nuclear magnetic resonance (13C-NMR) experiments, we have assigned three discernible configurational isomers observed in dimethyl sulfoxide-d6 (DMSO-d6) for an antitumor cyclic hexapeptide, RA-VII isolated from Rubia cordifolia. The largest isomer, amounting to 64%, has been assigned as conformer A with only a cis configuration between Tyr-5 and Tyr-6. The second configurational isomer, accounting for 32%, has adopted cis configurations between both Tyr-5 and Tyr-6 and between Ala-2 and Tyr-3. The third isomer, amounting to 4%, was determined to have cis configurations for all of the three N-methyl amide bonds.

Antineoplastic Agents, Phytogenic↗
PubMed1992

Isoflavanones from the heartwood of Swartzia polyphylla and their antibacterial activity against cariogenic bacteria.

The methanolic extract of Swartzia polyphylla DC. heartwood had antibacterial activity against cariogenic bacteria, the mutans Streptococci. The chromatographic purification of the extract afforded seven flavonoids. Among them, three known isoflavanones, dihydrobiochanin A, ferreirin and darbergioidin, and one new isoflavanone, 5,2',4'-trihydroxy-7-methoxyisoflavanone (dihydrocajanin) had potent antibacterial activity against cariogenic bacteria. This effect was not detected on isoflavone derivatives. A comparative antibacterial study of various flavonoids was further performed, and their structure-activity relationship was discussed.

Anti-Bacterial Agents↗
PubMed1992

Structures and conformations of metabolites of antitumor cyclic hexapeptides, RA-VII and RA-X.

Metabolites of antitumor cyclic hexapeptides, RA-VII and -X which were isolated from Rubia cordifolia were studied by hepatic microsomal biotransformation in rats and in bile juice of rabbits to which these drugs were administered intravascularly. Their structures and conformations were elucidated by two-dimensional nuclear magnetic resonance techniques, temperature effect on NH protons and nuclear Overhauser effect experiments. Specific N-demethylation of Tyr-3, O-demethylation and hydroxylation at aromatic rings of Tyr-3 and -5 were observed. Compared with metabolites of RA-VII, most of RA-X was excreted unchanged in the bile juice. Relationship among their structures, conformations and antitumor activities is also discussed.

Animals↗
PubMed1992

Evaluation of arterial wall histological and physical characteristics using intravascular echography.

Using a high-frequency ultrasound intravascular imaging system we evaluated the intravascular echo image by comparing it with histological findings in 57 arterial segments of 17 autopsy cases. Moreover, in 8 dogs we estimated the arterial elastic property by observing the change of the arterial section accompanying a reduction of arterial pressure due to hemorrhage (H) or nifedipine infusion (N). The characteristics of the intravascular echograms were as follows: 1) In a normal artery the arterial wall consisted of the inner high echoic, the medial low echoic and the outer high echoic layers. 2) In an aged artery the fibrous thickened intima was seen as the low echo layer giving an echo about the same as that of the normal media, and the intensity of the echo from the degenerated media was lower than that of the normal media. 3) In atheroma the echo intensity of the elastic fiber-rich region was higher than that of the surrounding region, while the calcified region showed as a brighter echo with outer echo free space due to shadowing. We measured the arterial radius, area and circumferential length on the intravascular echo image and calculated the arterial wall tension-circumferential length and the pressure-arterial area relationships. By analysing each relation, we obtained the stiffness and compliance parameters, respectively. The stiffness parameter with N was lower than that with H [(1.5 +/- 0.5) x 10(-2) vs (2.8 +/- 0.9) x 10(-2)] and the compliance parameter with N was higher than that with H (0.92 +/- 0.28 vs. 0.46 +/- 0.12).(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1992

Acute myocardial infarction in a young adult as possible sequela of Kawasaki disease--a case report of successful intracoronary thrombolytic therapy and histological study of an aneurysm.

Emergency coronary angiography in a 28-year-old male suffering an acute anteroseptal myocardial infarction revealed complete obstruction of the left anterior descending artery in association with multiple aneurysms of the 3 major coronary arteries. Successful intracoronary thrombolytic treatment with urokinase infusion directly into the infarct-related artery was performed 2 h after the onset. Follow-up left ventriculogram showed preservation of left ventricular wall motion. Fifty days after the infarction, he underwent aorto-coronary bypass surgery. Histological examination of the biopsy specimen obtained from the aneurysm of the distal portion of the right coronary artery revealed that the 3-layer architecture of the arterial wall had been completely lost. The wall was replaced by fibrotic tissue, with slight mononuclear cell infiltration around the small vessels, but no acute inflammatory reaction or atheromatous change was seen. In spite of the presence of the coronary risk factors of hypertension and hyperlipidemia, angiography revealed no evidence of atherosclerosis of systemic arteries. It is suggested that the coronary aneurysms in this case are possible sequelae of Kawasaki disease in childhood.

Adult↗
PubMed1992

[Effect of Z-103 on wound healing by dermal incision in guinea pigs].

We investigated the effects of Z-103, ZnSO4, L-carnosine and solcoseryl on wound healing by dermal incision in guinea pigs. The tensile strength, hydroxyproline contents and the value of angiogenesis (carmine contents) at the wounded site of dorsal skin were used as indices of wound healing. Z-103, given daily s.c., increased the tensile strength and hydroxyproline contents on day 4 after operation in a dose-dependent manner; in particular, the effect of 10 mg/kg of Z-103 was nearly equal to that of solcoseryl at 0.5 ml/animal. Moreover, Z-103 10 mg/kg increased the value of angiogenesis on day 3 after the operation. On the other hand, ZnSO4 and L-carnosine, components of Z-103, also similarly increased the tensile strength and hydroxyproline contents. These results suggest that Z-103 possessed an accelerative action on wound healing, and these effects may be due to the activity of its components, ZnSO4 and L-carnosine.

Animals↗
PubMed1992

[The gastric mucosal adhesiveness of Z-103 in rats with chronic ulcer].

The gastric mucosal adhesiveness of Z-103 in rats with acetic acid ulcer was studied macroscopically, histologically, and biochemically. From macroscopical observations, when Z-103 was orally administered to an acetic acid ulcer model, there was adhesion of Zn to the normal mucosa as well as the ulcerous site under both the fasting condition and after feeding. It was also proven that the strength and duration of adhesiveness were increased dose-dependently under fasting conditions. In addition, histological localization of Zn was noted from the covering epithelial cell layer to the gastric lamina propria mucosae in the normal tissue and in the most superficial ulcerous layer and the granulous layer of the ulcerous site. Measurement of the gastric tissue Zn content after oral administration of 100 mg/kg of Zn showed that the Zn content was significantly increased for 6 hr at the normal site and for 24 hr at the ulcerous site. On the other hand, although ZnSO4 and ZnSO4+carnosine combination macroscopically produced generally the same level of adhesiveness as Z-103, when the gastric tissue Zn content for Z-103 and ZnSO4 were compared, the Zn content of ZnSO4 was lower than that for Z-103 at both the normal and ulcerous site. In summary, Z-103 shows a long-term adhesive and permeable action on the gastric mucosa in acetic acid ulcer rats, and it has a comparable high affinity at the ulcerous site.

Acetates↗