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Biomedical subjects

S Nishijima

Publications and source records attributed to S Nishijima.

At least 73 records · Page 4Linked to original sources
PubMed1988

Disruption of the Escherichia coli cls gene responsible for cardiolipin synthesis.

The cls gene of Escherichia coli is responsible for the synthesis of a major membrane phospholipid, cardiolipin, and has been proposed to encode cardiolipin synthase. This gene cloned on a pBR322 derivative was disrupted by either insertion of or replacement with a kanamycin-resistant gene followed by exchange with the homologous chromosomal region. The proper genomic disruptions were confirmed by Southern blot hybridization and a transductional linkage analysis. Both types of disruptants had essentially the same properties; cardiolipin synthase activity was not detectable, but the strains grew well, although their growth rates and final culture densities were lower than those of the corresponding wild-type strains and strains with the classical cls-1 mutation. A disruptant harboring a plasmid that carried the intact cls gene grew normally. The results indicate that the cls gene and probably the cardiolipin synthase are dispensable for E. coli but may confer growth or survival advantages. Low but definite levels of cardiolipin were synthesized by all the disruptants. Cardiolipin content of the cls mutants depended on the dosage of the pss gene, and attempts to transfer a null allele of the cls gene into a pss-1 mutant were unsuccessful. We point out the possibilities of minor cardiolipin formation by phosphatidylserine synthase and of the essential nature of cardiolipin for the survival of E. coli cells.

Alleles↗
PubMed1987

Monolayer-forming islet cell culture from neonatal pig pancreas: using sequential treatment with EDTA-dispase and monoiodoacetic acid for preparation and purification.

A new method for the preparation and purification of a monolayer-forming islet cell culture from the neonatal pig pancreas is described. Single cell preparations of the pig pancreas were obtained by gently stirring the chopped pancreases in a medium containing sequential EDTA-dipase. Exposure of the cells to monoiodoacetic acid (10 micron) and BSA-gradient resulted in improved preparation, highly enriched in the endocrine cells. The cells were maintained in tissue culture medium 199 containing 5.5 mM D-glucose, with or without 0.1 mM 3-isobutyl-1-methylxanthine, or 16.7 mM D-glucose and 20% fetal calf serum. During a 6-day culture period, many small cell aggregates appeared in the media. The cell clusters attached to the bottom of the dish and formed monolayers. Provocative stimulation and radioimmunoassay for insulin showed the existence of numerous and viable B cells in the cell clusters. The other three types of islet cells were also demonstrated immunohistochemically in the cell cluster. It is concluded that this improved culture technique provides a useful tool for morphological and biochemical studies of islet cells and a potential source of material for transplantation of B-cells from the pancreas.

1-Methyl-3-isobutylxanthine↗
PubMed1984

[A typical case of DIC precipitated by cesarean section done for severe toxemia of pregnancy and a follow up laboratory study of the progress of DIC].

A typical case of DIC presumably precipitated by cesarean section done for severe toxemia of pregnancy is reported. A laboratory study followed up the progress of DIC, especially of the drop in the consumptive platelet count and fibrinogen level as a result of excessive blood clotting. In this case the patient was a 29-year-old nulliparous gravida 1 who developed severe toxemia at 29 weeks and underwent a cesarean section for fetal distress at 33 weeks, although the baby died immediately after birth. On the following day of operation slight bleeding from the operative wound occurred and she had pertinent laboratory tests, which yielded a platelet count of 81,000/mm3, plasma fibrinogen level of 200mg/dl and FDP of 160 micrograms/ml and led to a diagnosis of DIC. While placing her on replacement and adjunctive therapies the laboratory tests were performed serially, which permitted a close follow-up observation of the subsequent progress of DIC with the detection of lowered platelet counts and fibrinogen levels as administration of Heparin resulted in an increase in the amount of bleeding, FOY, 800mg/day, was instituted and following this treatment the DIC disappeared.

Adult↗
PubMed1983

The developmental process from micelle to liquid crystal in the ursodeoxycholate, phosphatidylcholine and cholesterol solution.

The developmental process from micelle to liquid crystal via the bilayer membrane is described based on electron microscopic observations using the freeze fracture method in solutions containing ursodeoxycholate, phosphatidylcholine and cholesterol. Comparisons of sodium tauroursodeoxycholate and sodium taurochenodeoxycholate solutions were performed and this developmental process was confirmed only in the sodium tauroursodeoxycholate, phosphatidylcholine and cholesterol solution under physiological conditions.

Chemical Phenomena↗
PubMed1983

Primary macroglobulinemia presenting as multiple ulcers of the legs.

Multiple ulcers developed on the lower legs of a 67-year-old man suffering from macroglobulinemia. Histological and direct immunofluorescence studies on biopsy specimens taken from the lesions revealed dilation of capillaries, deposition of large quantities of IgM in the vessels, and deposition of C3 in the vessel walls. A marked increase in blood Clq binding immune complexes was also noted. These findings suggest immune complex-induced ulceration. The fact that IgM-type cryoglobulins were positive implies that cryoglobulins derived from macroglobulins may play an important causative role in ulceration.

Aged↗
PubMed1982

[Clinical evaluation of cefmetazole in the dermatologic field].

The therapeutic efficacy and safety of cefmetazole, a cephamycin-derived antibiotic in an injectable form were evaluated in patients with pyogenic infection in the dermatological field. Especially, it was found to be extremely effective for the skin diseases due to staphylococci or streptococci. The results obtained were the following; marked improvement in 18 cases and moderate improvement in 34 cases out of 61 cases, attaining efficacy of 86.7%. Side effects were noted as the rise of GOT and GPT in 3 cases, which were normalized by ceasing its further administration. The MIC of cefmetazole against Staphylococcus aureus isolated out of foci was 0.39-6.25 microgram/ml, while those of CEZ, CXM and ABPC used as the controls exceeded 50 microgram/ml in some cases. It is considered thus, that cefmetazole, is superior to these other antibiotics also in terms of MIC.

Adolescent↗