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Biomedical subjects

H Fukui

Publications and source records attributed to H Fukui.

At least 397 records · Page 22Linked to original sources
PubMed1989

Urinary prostaglandins and renal function in obstructive jaundice.

Changes in urinary prostaglandin E2 (PGE2), 6-keto PGF1 alpha, and thromboxane (TXB2) excretion in 12 patients with obstructive jaundice were observed in relation to renal function and the renin-angiotensin (R-A) system. In obstructive jaundice before percutaneous biliary drainage the creatinine clearance (CCr) was significantly lower (p less than 0.001) and the PGE2 and plasma angiotensin II (AII) concentrations were significantly higher (p less than 0.005 and p less than 0.005, respectively) than those in normal subjects. Both 6-keto PGF1 alpha and TXB2 were widely distributed. When CCr returned to normal after drainage, PGE2 and plasma AII also returned to normal, but when CCr decreased after drainage, PGE2 and plasma AII increased. Before drainage, PGE2 correlated negatively with CCr (r = -0.72, p less than 0.01) and positively with plasma AII(r = 0.69, p less than 0.02). 6-Keto PGF1 alpha correlated positively with serum total bilirubin (r = 0.66, p less than 0.02). The percentage change in PGE2 after drainage correlated negatively with that in CCr (r = -0.95, p less than 0.005). The percentage chang in plasma AII correlated positively with that in urine PGE2 (r = 0.94, p less than 0.005) and negatively with that in CCr (r = -0.85, p less than 0.02). These results suggest that PGE2 is closely related to the R-A system and might assist in the maintenance of renal circulation in obstructive jaundice.

6-Ketoprostaglandin F1 alpha↗
PubMed1989

Cataract prevention in diabetic Octodon degus with Pfizer's sorbinil.

The Octodon degus has been reported to have higher aldose reductase activity in the lens compared to the gerbil and rat. When made diabetic the degus develop cataracts within 4 weeks. We have been able to completely prevent cataract formation in diabetic degus using Pfizer's sorbinil for up to 6 months. This is further evidence of the role of aldose reductase in the formation of cataracts in diabetes.

Aldehyde Reductase↗
PubMed1989

An arginine to cysteine amino acid substitution at a critical thrombin cleavage site in a dysfunctional factor VIII molecule.

We have analyzed the factor VIII (FVIII) protein and the nucleotide sequence around two thrombin cleavage sites, at arginine 372 in the FVIII heavy chain and arginine 1689 in the FVIII light chain in a naturally occurring dysfunctional FVIII variant, FVIII Okayama. The patient was a 42-year-old hemophiliac with a FVIII coagulant activity of 0.03 U/mL and a FVIII antigen level of 0.8 U/mL. The patient's FVIII was not thrombin activatable to levels seen in normal plasma. Immunoblotting of partially purified FVIII Okayama and normal FVIII showed that thrombin cleavage of the 92 kilodalton (Kd) heavy chain was impaired in the mutant protein. The patient's genomic DNA was amplified using the polymerase chain reaction with two sets of synthetic oligonucleotide primers spanning amino acid residues 319 to 400 and 1630 to 1720. Sequence analysis of the amplified DNA fragments revealed a cytosine to thymine transition, converting an arginine to a cysteine codon at residue 372. No abnormality was found in the FVIII light chain region analyzed. The patient's hemophilic brother and carrier mother revealed the same mutation. We conclude that the pathogenesis of hemophilia A in this patient is probably due to an arginine to cysteine substitution at a thrombin cleavage site in the FVIII heavy chain.

Adult↗
PubMed1989

[Properties of factor VIII/von Willebrand factor in two highly-purified factor VIII concentrates, Hemofil M and Monoclate, using monoclonal antibodies].

Properties of F. VIII/vWF in highly-purified factor VIII concentrates were examined using monoclonal antibodies. The F. VIII: C levels obtained with the chromogenic assay agreed with those obtained with the one-stage clotting method. The ratio between F. VIII: Ag and F. VII: C in Hemofil M and Monoclate was 1.09 and 1.34, respectively. The F. VIII: Ag levels assayed by monoclonal ELISAs were the same as those assayed by polyclonal ELISA, except that those assayed by C 5-ELISA tended to be higher. The ratio between F. VIII: Ag and vWF: Ag in Hemofil M and Monoclate was 105 and 45, respectively. Both concentrates lacked the large multimers of vWF and showed the intensification of the satellite bands. SDS-PAGE patterns showed almost no contamination. Immunoblot analysis revealed that F. VIII in both concentrates could react with 6 kinds of monoclonal antibodies to F. VIII. These results suggest that the fundamental structure of F. VIII molecule for coagulant activity in both concentrates are preserved.

Antibodies, Monoclonal↗
PubMed1989

[A case of esophageal diverticula in a child].

Esophageal diverticula in infants and children are rarely seen, even by the pediatric radiologist. This is a case report of an infant girl presenting with an esophageal diverticulum arising from the right anterior lateral aspect of the proximal third of the esophagus. The diverticulum included a metallic foreign body.

Diverticulum, Esophageal↗
PubMed1989

Macroscopic changes seen in human erythrocytes heated in a suspension and the resulting effect on their blood group activity.

Changes in the macroscopic appearance and in the activity of various erythrocyte antigens were observed by heating human erythrocytes of known blood groups at 60-260 degrees C for 15, 30, and 60 min in a suspension that was sealed in an airtight test tube. While the erythrocytes underwent severe hemolysis after heating at 60 degrees C, this phenomenon was not macroscopically observed on heating at 80 and 100 degrees C and the cellular sludge in the tested became brown in color. With further temperature increases, the supernatant became pale yellow at 120-140 degrees C, brown at 160 degrees C and dark brown at 180 degrees C and above, whereas the sediment hardened and became darker in tone. Both A and B activity in the cellular sludge remained active until a 30-min heating at 240 degrees C, as did the O(H) activity until a 15-min heating at 220 degrees C. Both Lewis type activity was detected until a 30-min heating at 200 degrees C and a 15-min heating at 220 degrees C. The P1 activity remained specific after a 30-min heating at 180 degrees C and false-positive reactions were observed after 60 min at 180 degrees C. Among the Rh antigen activity, D activity remained until a 60-min heating at 140 degrees C, C and E until a 30-min heating at 140 degrees C, c until a 15-min heating at 140 degrees C and e until a 30-min heating at 100 degrees C.(ABSTRACT TRUNCATED AT 250 WORDS)

Blood Group Antigens↗
PubMed1989

[A case report of rhinocerebral mucormycosis in hemodialysis patient receiving deferoxamine].

Deferoxamine (DFO) has been widely used in the treatment of aluminum toxicity in patients on chronic dialysis. Mucormycosis is an opportunistic infection caused by fungi of the Mucorales order and some reports suggested a role for DFO in the precipitation of this infection. A 50-year-old man had been on hemodialysis for 16 years. 6 weeks before admission, he was begun on DFO because of aluminum toxicity. 2 weeks before admission, general fatigue and fever developed and followed by headache and loss of vision. He was admitted to this hospital with disturbed consciousness. His clinical course and a CT scan of the head suggested cerebral infarction. Within 24 hours he required ventilatory support and died 5 days after the admission. On autopsy, rhino-cerebral mucormycosis was demonstrated with a mycotic thrombus involving the left middle cerebral artery. Dialysis-related mucormycosis has recently appeared in the literature. We feel that hemodialysis patients on DFO may be at risk for potentially fatal mucormycosis infections. With a possible relationship between DFO treatment and this fatal opportunistic infection, caution should be given before using this drug and the indications should be definitive.

Brain Diseases↗
PubMed1989

[Feasibility of subrenal capsule assay as chemosensitivity test for primary esophageal cancer].

Subrenal Capsule Assay (SRCA) as a chemosensitivity test was performed on 39 esophageal squamous cell carcinomas in order to select a more effective chemotherapy and assess the correspondence between the assay results and clinical results. The implant grew progressively for six days and decreased from day 7 in the group of control mice. Histologically, host cell infiltration and new vessel was observed from day 3 after transplantation. Tumor growth curve was not influenced by immunosuppression with cyclophosphamide for six days. As primary esophageal squamous cell carcinomas, two diameter method was more sufficient for evaluating the sensitivity than volume method. Macroscopically, the rate of remained implants was 88.2% and yielded an evaluable assay rate of 94.9%. As to sensitivity, the effective rate of CDDP was 24.3%, BLM was 5.9%, MTX was 8.6% and VDS was 20.7%. Histologically, the rate of tumor cells occupied in implant was decreased by grade of augmentation of effectiveness. Clinically, correspondence between the assay results and clinical result was obtained in 92.3%. SRCA is a new promising chemosensitivity test which is clinically useful, and the present results indicated the feasibility of its use in developing an effective chemotherapy for primary esophageal cancer.

Aged↗
PubMed1988

Autoradiographic visualization in rat brain of receptors for omega-conotoxin GVIA, a newly discovered calcium antagonist.

Putative N-type voltage-sensitive calcium channels were localized autoradiographically in thaw-mounted rat brain slices using [125I]omega-conotoxin GVIA as a ligand. Density of the toxin binding sites were highly heterogeneous throughout the brain. The highest density of the binding sites was observed in the glomerular layer of the olfactory bulb, cerebral cortex, molecular layer of the hippocampus, amygdaloid complex, reticular part of the substantia nigra, molecular layer of the cerebellar cortex, and nucleus of the solitary tract. White matter tract regions such as the internal capsule, corpus callosum, fimbria of the hippocampus, fornix, and fasciculus retroflexus showed an extremely low density.

Animals↗
PubMed1988

Induction of cytosolic aspartate aminotransferase by glucagon in primary cultured rat hepatocytes.

The activity and the mRNA content of cytosolic aspartate aminotransferase (EC 2.6.1.1) were examined in cultured rat hepatocytes. Addition of glucagon (1 x 10(-7) M) in the presence of dexamethasone (1 x 10(-7) M) caused about 2-fold increase in the activity and mRNA content. Dibutyryl cAMP (1 x 10(-4) M) could replace glucagon for this effect. Maximal induction of cytosolic aspartate aminotransferase mRNA was observed 8 h after their additions. Insulin (1 x 10(-7) M) did not inhibit the enzyme induction by glucagon or dibutyryl cAMP. These results suggest that the cytosolic aspartate aminotransferase gene is regulated by cAMP, and not by insulin.

Animals↗
PubMed1988

Histamine H1-receptor in endothelial and smooth muscle cells of guinea-pig aorta.

The location of histamine H1-receptors in the thoracic aorta of guinea-pigs was studied with a [3H]mepyramine binding assay. [3H]Mepyramine binding studies of whole and rubbed aortas, and of cultured endothelial and smooth muscle cells showed that the Kd values were all in the range 0.53-0.76 nM, but that the Bmax values were 19.1, 10.1, 63.3 and 11.6 fmol/mg protein, respectively. Thus, the whole aorta contained more H1-receptors than the rubbed one (free of endothelium), and cultured endothelial cells contained more H1-receptors than smooth muscle cells. These results indicate that more histamine H1-receptors were concentrated in the endothelial cells than in the smooth muscle cells in guinea-pig aorta.

Animals↗
PubMed1988

Histamine H1-receptor in the retina: species differences.

Histamine H1-receptors in membranes of the various mammalian retinas were studied by [3H]mepyramine binding assay. Specific [3H]mepyramine bindings to bovine, pig, dog and human retinas were observed with the dissociation constants (KD), 3.8 +/- 1.2 nM, 1.8 +/- 0.6 nM, 2.6 +/- 0.6 nM and 3.0 +/- 0.9 nM, respectively, which were similar to those found in brains. But there was no detectable specific binding in the guinea-pig and rabbit retinas. The number of binding sites (Bmax) ranged from negligible value to 290.7 +/- 51.7 fmole/mg protein(human retina). Some H1-antagonists acted as potent agents in competing with [3H]mepyramine binding to bovine and pig retinas. These results indicated that histamine H1-receptors exist in some mammalian retina and have similar characteristics to those in brain membranes, but they distributes in the wide difference of the binding capacities among the species, while in brain variations were smaller.

Animals↗
PubMed1988

Hemostatic effect of a heat-treated factor VIII concentrate (Haemate P) in von Willebrand's disease.

A heat-treated factor VIII (F VIII) concentrate (Haemate P) has been administered to patients with various types of von Willebrand's disease (vWD). The 4 activities of F VIII/vWF as well as change in the multimeric structure of vWF were then studied. In 4 patients with type I vWF who were given a Ristocetin cofactor (Rcof) dose of 42-78 U/kg, there was a clear reduction of the bleeding time and an increase of F VIII: C, F VIII: Ag, Rcof and vWF: Ag for several hours. The recovery of Rcof. after 1 h was 50-75%. Although the multimeric composition of vWF in these patients was similar to that of normal plasma, the density of each multimer band was very low. After infusion, however, the density of all multimer bands increased for several hours, to decrease again after 24 h. In 4 patients with type II A vWD who received a dose of Rcof of 55-76 U/kg, the 4 activities of F VIII/vWF increased similarly as was the case in type I. All patients had only 3-4 smaller multimer bands. New larger and intermediate multimers appeared for several hours after infusion of the preparation. Two patients with type III vWD who received doses of Rcof of 52 and 65 U/kg showed also a similar increase in the 4 activities of F VIII/vWF after infusion. All the multimers lacking in these patients appeared for several hours after infusion.

Adolescent↗