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Biomedical subjects

I Masuda

Publications and source records attributed to I Masuda.

At least 55 records · Page 3Linked to original sources
PubMed1993

Evidence that a 550,000-dalton cartilage matrix glycoprotein is a chondrocyte membrane-associated protein closely related to ceruloplasmin.

Cartilage matrix glycoprotein (CMGP) is a disulfide-bonded 550,000-dalton protein that is synthesized by chondrocytes and ciliary epithelial cells. We have purified the protein from bovine and porcine articular cartilage and have sequenced two peptides, which both have significant homology with human ceruloplasmin, a copper-binding oxidase. Immunolocation analysis indicates that a commercial polyclonal antiserum to human ceruloplasmin reacts with bovine cartilage CMGP. Chelating columns made with copper bind CMGP from bovine cartilage extracts. CMGP is present in bovine chondrocyte membrane preparations purified from sucrose density gradients. Oligonucleotide probes have been synthesized based on the published sequence of the 3'-untranslated region and a portion of the C terminus of human ceruloplasmin and have been used to amplify a cDNA fragment from bovine cartilage and human liver libraries. CMGP demonstrates oxidase activity towards p-phenylenediamine similar to that of ceruloplasmin. These studies suggest that CMGP is closely related to, if not identical with, ceruloplasmin. It is possible that CMGP may be involved in metal transport into and/or within the chondrocyte.

Amino Acid Sequence↗
PubMed1991

A case of diabetic non-ketotic hyperosmolar coma with an increase with plasma 3-hydroxybutyrate.

We have seen a case of "diabetic non-ketotic hyperosmolar coma" with ketosis. An 84-year-old man was brought into the hospital in a deeply comatous and dehydrated state. The initial blood glucose level was 1252 mg/dl with plasma osmolarity of 435 mOsm/l, but no ketonuria was detected by the nitroprusside method (Ketostix). However, the plasma 3-hydroxybutyrate (3-OHBA) level was 5 mM in a newly developed bedside film test. The serum ketone bodies were later found to be 5.56 and 0.82 mmol/l for 3-OHBA and acetoacetate (AcAc), respectively. A marked increase in glucagon, cortisol and ADH with renal dysfunction (creatinine 5.0 mg/dl) were noted. An abnormal electrocardiogram, occular convergence and chorea like movement disappeared after correction of metabolic disturbances. The moderate level of IRI (14 microU/ml) on admission and a good response to glucagon 2 months after admission also indicate that the present case is a typical hyperosmolar non-ketotic coma. Because of a preferential increase in 3-OHBA, ketonuria seemed to be absent in the regular nitroprusside test. Marked dehydration is thought to cause renal dysfunction, and the increase in ADH may have helped to prevent further aggravation of ketoacidosis. We propose to change the term hyperosmolar non-ketotic coma (HNC) to diabetic hyperosmolar coma (DHC), because sometimes patients with hyperosmolar non-ketotic diabetic coma are ketotic, as seen in the present case. Determination of 3-OHBA or individual ketone bodies in blood is important and essential for the differential diagnosis of diabetic coma. The diagnosis of either ketoacidotic or hyperosmolar coma should be made depending on the major expression of ketoacidosis or hyperglycemic hyperosmolarity.

3-Hydroxybutyric Acid↗
PubMed1991

A histologic and immunohistochemical study of calcium pyrophosphate dihydrate crystal deposition disease.

The articular cartilage, synovial membrane, and meniscus from ten patients who had calcium pyrophosphate dihydrate (CPPD) crystal deposition disease showed strong immunoreactivity for dermatan sulfate proteoglycan, Type I collagen, and S-100 protein in hypertrophic chondrocytes around the crystals, their pericellular matrix, and deposits of the crystals. Electron microscopy revealed that small crystals were formed around the hypertrophic chondrocytes, especially in the degenerated matrix containing electron-dense granular materials and cellular debris. Chondrocytes of this kind were never observed in the articular tissue from ten patients who had osteoarthrosis. These hypertrophic chondrocytes with several unique immunohistochemical characteristics may initiate the formation of CPPD crystals.

Aged↗
PubMed1990

[Serum adenosine deaminase and its isozyme activity in leukemia and MDS].

We studied the activity of serum adenosine deaminase (ADA) and its isozyme in 36 leukemic patients (16 ANLL, 11 ALL, and 9 CML) and 8 MDS. Isozyme was measured by erythro-9-(2-hydroxy-3-nonyl) adenine (EHNA) inhibitory assay. This assay was simple and reliable. The appearance rate of abnormally high ADA value were 81.24% for ANLL, 100% for ALL, 77.8% for CML and 37.5% for MDS. The ADA level became high when MDS turned into overt leukemia. In isozyme pattern, there was a clear difference between ANLL and ALL. The isozyme I/II ratio was significantly higher (p less than 0.001) in ALL than ANLL. Lymphoblastic crisis of CML also had a high isozyme I/II ratio. There was a correlation between isozyme I and absolute number of peripheral blasts in ALL (r = 0.768). When observed time sequentially, ADA and isozyme changed correlatively with the number of blasts counts. Serum ADA and its isozyme are useful parameters both for leukemic diagnosis and treatment.

Adenosine Deaminase↗
PubMed1990

[Combination assay of IAP and ADA in hematologic malignancies].

We measured the levels of adenosine deaminase (ADA) and immunosuppressive acid protein (IAP) in 10 patients with acute myeloid leukemia (AML), 5 with acute lymphoblastic leukemia (ALL), 8 with chronic myeloid leukemia (CML), 7 with myelodysplastic syndrome (MDS), 5 with malignant lymphoma (ML), 3 with multiple myeloma (MM) and one with adult T cell leukemia. On admission, the level of IAP was abnormally high in all cases of AML and ALL 50% of CML cases, 71.4% of MDS cases, 60% of ML cases and none of MM cases. ADA was elevated in all cases of ALL, 77.8% of AML and CML cases, 57.1% of MDS cases, 60% of ML cases and 33.3% of MM cases. In 7 patients with AML, the level of IAP returned to normal when they achieved complete remission. On the other hand, the level of ADA had already returned to normal even during induction therapy. ADA showed a positive correlation with the absolute number of peripheral blasts and lactic dehydrogenase both in AML and ALL. These results suggest that ADA indicates the activity of leukemia and IAP indicates the immunocompetence of the host.

Adenosine Deaminase↗
PubMed1989

Exercise testing, clinical, and angiographic characteristics of anginal patients with and without diabetes mellitus.

To elucidate the influence of coexisting diabetes mellitus (DM) on clinical and pathophysiologic characteristics in patients with coronary artery disease (CAD), the authors reviewed 1,211 consecutive patients who underwent coronary angiography (CAG) and selected 80 patients with significant CAD but without myocardial infarction, hypertension, or other heart diseases, who underwent both symptom-limited treadmill test (TM) and CAG within four weeks. DM was found in 22 of the 80 patients. No significant difference in the average number of diseased arteries of left ventricular ejection fraction at rest was found between DM patients and patients without DM (NDM patients). The incidences of exercise-induced ST depression and anginal pain revealed no difference between DM and NDM patients. Mean duration of exercise was shorter in DM patients (345 +/- 97 sec) than in NDM patients (423 +/- 162 sec, p less than 0.01). Furthermore, anginal pain during exercise occurred earlier in DM patients (187 +/- 68 sec) than in NDM patients (248 +/- 99 sec, p less than 0.05). No significant difference in double product or magnitude of ST segment depression at the onset of anginal pain was found between DM and NDM patients. However, heart rate responsiveness to exercise in DM patients was higher than that in NDM patients. These findings may indicate that pathophysiology of the heart in CAD patients with DM is affected not only by CAD itself but also by myocardial damage due to DM.

Angina Pectoris↗
PubMed1989

A histological study of calcium pyrophosphate dihydrate crystal-deposition disease.

Synovial, meniscal, articular cartilage, and other connective tissue from fifty-seven patients who had calcium pyrophosphate dihydrate crystal-deposition disease was examined by light microscopy, electron microscopy, and electron-probe microanalysis. Safranin O-positive hypertrophic chondrocytes that contained proteoglycans were observed in the tissues of each patient. Microcrystals that were suggestive of early precipitation of crystals were found in the degenerating matrix surrounding hypertrophic chondrocytes. The matrix contained electron-dense amorphous material, including proteoglycans and debris of cellular components. The microcrystals were often seen in contact with degenerating collagen fibers. There was never any histological evidence of formation of crystal in the areas that had no hypertrophic chondrocytes. Chondrocytes of this kind, surrounded by characteristic degenerating matrix, were never observed in the articular tissue from sixty-one patients who had only osteoarthritis. On the basis of our results, we speculate that electron-dense amorphous material containing proteoglycans and debris of cellular components, and the degenerating collagen fibers that were seen around the hypertrophic chondrocytes, may play important roles in the formation of calcium pyrophosphate dihydrate crystals.

Adult↗
PubMed1988

Histologic localization of lipid in the articular tissues in calcium pyrophosphate dihydrate crystal deposition disease.

We demonstrated the histologic localization of lipid in the articular cartilage, meniscus, and synovium in calcium pyrophosphate dihydrate (CPPD) crystal deposition disease, by staining with Sudan III. Almost all the sites of tophus-like deposits of CPPD crystals and the degenerated matrix containing low concentrations of scattered CPPD crystals stained strongly with Sudan III. Transmission electron microscopy demonstrated round or oval lipid droplets in more than half of the chondrocytes around the crystals in each of these tissues. Small lipid droplets were also seen on or around the crystals. These findings suggest that lipids are abundant at the site of CPPD crystal deposition and may be involved in CPPD crystal formation.

Aged↗
PubMed1988

Abnormal polyamine metabolism in hypertensive cardiac hypertrophy.

In order to assess myocardial hypertrophic activity during the process of hypertensive cardiac hypertrophy in the presence and absence of treatment with anti-hypertensive agents, we analyzed myocardial polyamine concentrations in spontaneous hypertensive (SHR) rats and control rats of Wistar Kyoto (WKY) strain. The anti-hypertensive agents studied were diltiazem, hydralazine and captopril, each of which was administered for 5 weeks. In comparison with WKY rats, SHR rats showed elevated blood pressure and enlarged hearts with higher myocardial spermidine concentration. Although blood pressure was lowered in the diltiazem-treated SHR rats, heart weight and myocardial spermidine concentration increased as in untreated SHR rats. In the hydralazine-treated group increases in both blood pressure and myocardial spermidine concentration were suppressed, while an increase in heart weight was not. In the captopril-treated group, increases in blood pressure, heart weight and spermidine concentration were all suppressed. Since spermidine level appears to be a sensitive indicator of hypertrophic activity in the heart, this study suggests that captopril exerts an inhibitory effect on hypertensive cardiac hypertrophy whereas diltiazem does not. It also suggests that hypertrophy may reach a certain plateau level earlier in the hydralazine-treated animals than in others.

Animals↗
PubMed1988

Clinical features of pseudogout attack. A survey of 50 cases.

Fifty patients (15 men and 35 women; average age, 70.8 years) with pseudogout were studied. Arthroscopic biopsy was useful for diagnosis in one case with no light microscopic evidence of crystals in the synovial fluid. Attacks affected 93 sites in 50 patients. Attacks in ten patients occurred after mild trauma, long distance walks, total knee arthroplasty, or intraarticular injection of microcrystalline glucocorticoid. Twenty-five patients had fevers averaging 38 degrees. In five patients the fever was associated with mental confusion. Fourteen patients were initially suspected or misdiagnosed as having septic arthritis. Six patients were treated surgically under this misdiagnosis, with synovectomy complicated by limitation of motion of both knees in one patient. The involvement of more than one joint was noted in 21 patients. Polyarthritis could be an important clue to the diagnosis performed early; the combination of arthrocentesis and injection of microcrystalline glucocorticoid provided excellent therapy.

Acute Disease↗
PubMed1984

Long-term follow-up study of 13 autistic children.

This is a report concerning 13 autistic children who have been followed up from their early infancy to adulthood. Some intake variables, such as speech development at the age of 5, were correlated with the outcome status. As a result, we showed that a higher level of speech development at age 5 did not necessarily lead to a better outcome in social adaptability. We showed also that any of the variables we examined, such as the presence of brain organic abnormality, the duration of schooling and the duration of medical treatment, were not factors in determining a good or poor prognosis. We concluded that a rather poor outcome seen in our subjects might be due to the particular situation in Japan throughout this study period, and not a reflection of the real natural history of early infantile autism.

Autistic Disorder↗
PubMed1981

Prevention of gastric ulcers in swine by feeding of sodium polyacrylate.

Five experiments involving 169 swine were conducted to determine the effects of 0.1% to 0.5% sodium polyacrylate (PANa) in rations of growing swine on weight gain, feed conversion, and occurrence of esophagogastric lesions. Seemingly, PANa prevented swine from developing esophagogastric ulcers. Esophagogastric ulcers or erosions occurred in 42.9% of the swine fed a PANa-free diet, but occurred in only 9.8% of those fed a diet containing PANa. Addition of PANa (0.1% to 0.5%) to the growing ration increased weight gain and feed conversion. The anti-ulcer effect of PANa was discussed.

Acrylic Resins↗