Search PubMed⌕ Search

Biomedical subjects

T Hagiwara

Publications and source records attributed to T Hagiwara.

At least 127 records · Page 7Linked to original sources
PubMed1987

Tissue-specific and periodic changes in the nuclease sensitivity of the fibroin gene chromatin in the silkworm Bombyx mori.

Nuclei of substantial purity were isolated from the middle or posterior silk glands of the silkworm Bombyx mori larvae. Both the fibroin H- and L-chain gene sequences in the isolated nuclei from the posterior silk glands of the fifth instar larvae, where the genes are transcribed actively, are extremely sensitive to the digestion with DNaseI; on the other hand, these sequences in the middle silk gland nuclei from the same larvae, where the genes are not expressed, are markedly resistant to the digestion. The H-chain gene sequences in the posterior silk gland nuclei from the fifth instar larvae are also highly susceptible to the digestion with micrococcal nuclease, HinfI, and HhaI. The digestion products with micrococcal nuclease show a continuous size distribution. The H-chain gene sequences in the middle silk gland nuclei or the posterior silk gland nuclei from the fourth molting stage are cleaved partially into nucleosome dimer to oligomer sizes upon digestion with higher concentrations of micrococcal nuclease, suggesting that the inactive forms of the H-chain gene chromatin are constructed by folding of the chromatin fiber containing a regular array of nucleosomes. Hypersensitive sites to micrococcal nuclease are present near both ends of the second exon, a major body of the fibroin H-chain gene, in both the active and inactive forms of the chromatin. The DNaseI or micrococcal nuclease sensitivity of the H-chain gene chromatin in the posterior silk gland nuclei shows periodical changes corresponding to the intermolt-molt-intermolt cycle.

Animals↗
PubMed1987

Tissue distribution of casein kinases.

The activities of casein kinases 1 and 2 in cytosol fractions prepared from 12 different rat tissues were compared. Casein kinase activities were detected in all tissues examined. Total casein kinase activities of lung, spleen, testis, and thymus were much higher than those of skeletal muscle, cardiac muscle, and adrenal gland. When activities of casein kinases 1 and 2 partially purified from lung, spleen, testis, and thymus prepared from 5 rats were compared, both total and specific activities of these kinases in testis were higher than those in the other tissues. These results indicate that testis is the most suitable tissue in rats for large-scale purification of casein kinase 1 as well as casein kinase 2.

Animals↗
PubMed1986

Tissue distribution of casein kinases.

The activities of casein kinases 1 and 2 in cytosol fractions prepared from 12 different rat tissues were compared. Casein kinase activities were detected in all tissues examined. Total casein kinase activities of lung, spleen, testis, and thymus were much higher than those of skeletal muscle, cardiac muscle, and adrenal gland. When activities of casein kinases 1 and 2 partially purified from lung, spleen, testis, and thymus prepared from 5 rats were compared, both total and specific activities of these kinases in testis were higher than those in the other tissues. These results indicate that testis is the most suitable tissue in rats for large-scale purification of casein kinase 1 as well as casein kinase 2.

Animals↗
PubMed1985

Phosphatidylserine and ornithine-containing lipids of Bordetella, hemagglutinins of lipoamino acid structure, and their control in biomembranes.

From the observation by light and electron microscopy, it was proved that phosphatidylserine agglutinates human erythrocytes by the same mechanism as that of ornithine-containing lipids of Bordetella described previously. The proposed mechanism was that two erythrocytes were bound through some liposomes of the lipoamino acids by hydrophobic and ionic interaction, and hydrogen bonding, between the lipoamino acids and the lipids or proteins in the membranes of erythrocytes. Hemagglutinating activity of phosphatidylserine might be controlled so as not to be expressed in biomembranes, on the basis of the finding that the liposomes constituted of phosphatidylserine and more than equal quantities of phosphatidylcholine did not exhibit hemagglutinating activity.

Bordetella↗