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Biomedical subjects

M Ono

Publications and source records attributed to M Ono.

At least 829 records · Page 46Linked to original sources
PubMed1984

Molecular cloning and long terminal repeat sequences of intracisternal A-particle genes in Mus caroli.

We isolated DNA clones of intracisternal A-particle (IAP) genes from the genome of an Asian wild mouse, Mus caroli. A typical M. caroli IAP gene was 6.5 kilobase pairs in length and had long terminal repeat (LTR) sequences at both ends. The size of the LTR was 345 base pairs in clone L20, and two LTRs at both ends of this clone were linked to directly repeating cellular sequences of 6 base pairs. Each LTR possessed most of the structural features commonly associated with the retrovirus LTR. The restriction map of the M. caroli IAP gene resembled that of Mus musculus, although the M. caroli IAP gene was 0.4 kilobase pairs shorter than the M. musculus IAP gene in two regions. Sequence homology between the M. caroli and M. musculus IAP LTRs was calculated as about 80%, whereas the LTR sequence of the Syrian hamster IAP gene was about 60% homologous to the M. caroli LTR. The reiteration frequency of the M. caroli IAP genes was estimated as 200 to 400 copies per haploid genome, which is at least 10 times the reported value. These results suggest that the IAP genes observed in the genus Mus are present in multiple copies with structures closely resembling the integrated retrovirus gene.

Animals↗
PubMed1984

Evidence that opiatergic and alpha-adrenergic mechanisms stimulate rat growth hormone release via growth hormone-releasing factor (GRF).

An antiserum raised against human pancreatic growth hormone-releasing factor-(1-40) (hpGRF-40) was found to recognize the rat hypothalamic growth hormone-releasing factor (rhGRF): This antiserum, when given iv to adult male rats, completely abolished GH release induced by a synthetic rhGRF (0.2, 1 microgram/kg BW), and inhibited the physiological GH secretion over 2 days. After passive immunization with anti-hpGRF-40 serum, iv injection of either FK 33-824 (100 micrograms/kg BW), an enkephalin analogue, or clonidine (125 micrograms/kg BW), an alpha-adrenergic agent, failed to stimulate GH release in the unanesthetized rat. These results indicate that the GH-releasing actions of opiatergic and alpha-adrenergic mechanisms are mediated through stimulation of endogenous rhGRF release in the rat.

Animals↗
PubMed1984

Microsurgical anatomy of the deep venous system of the brain.

The microsurgical anatomy of the deep venous system of the brain was examined in 20 cerebral hemispheres. The deep venous system is composed of the internal cerebral, basal, and great veins and their tributaries. This system drains the deep white and gray matter surrounding the lateral and 3rd ventricles and the basal cisterns. The deep veins are divided into a ventricular group composed of the veins converging on the walls of the lateral ventricles and a cisternal group that includes the veins draining the walls of the basal cisterns. The internal cerebral vein is included in the ventricular group because it is predominantly related to the ventricles, and the basal and great veins are reviewed with the cisternal group because they course through the basal cisterns. The choroidal veins are included with the ventricle veins because they arise on the choroid plexus in the ventricles. The thalamic veins appear in both the ventricular and the cisternal groups because some course on the ventricular surfaces and others course in the basal cisterns. The operative approaches to the major trunks in this system are reviewed.

Brain↗
PubMed1984

Concomitant falls of plasma cortisol and ACTH levels in a case of Cushing's disease during treatment with trilostane.

A 72-year-old man with Cushing's disease was treated with trilostane, a competitive inhibitor of adrenal 3 beta-hydroxysteroid dehydrogenase (3 beta-HSDH). The treatment with trilostane successfully lowered urinary excretion of 17-hydroxycorticosteroids (17-OHCS) and plasma levels of cortisol and elevated the plasma level of dehydroepiandrosterone. Unexpectedly, plasma ACTH fell from 109.7 +/- 45.0 to 42.7 +/- 27.3 pg/ml (P less than 0.01) in parallel with plasma cortisol. The hyperresponsiveness of plasma ACTH observed both in the metyrapone test and the lysine-vasopressin test was also ameliorated by treatment with trilostane. Then low dose of pituitary irradiation with cobalt-60 was added and his urinary excretion of 17-OHCS and plasma levels of cortisol decreased further. After treatment with trilostane was finally stopped, the plasma ACTH increased from 45.9 +/- 21.9 to 69.6 +/- 25.3 pg/ml (P less than 0.05) in parallel with plasma cortisol. Since then he has had no recurrence for 12 months. These observations suggest that trilostane, like other adrenal enzyme-inhibiting drugs, may induce unexpected improvement of the abnormality of the hypothalamic-pituitary axis present in Cushing's disease.

17-Hydroxycorticosteroids↗
PubMed1984

Activation of NK activity and auto-reactive cytotoxicity after hepatectomy.

Spleen cells serially sampled from normal mice following partial hepatectomy were tested for antibody-dependent cellular cytotoxicity (ADCC) and natural killer (NK) activity. There was a marked augmentation of these activities of spleen cells from the hepatectomized animals, compared to cells from controls with a simple laparotomy. The augmentation of ADCC in the hepatectomized mice was largely attributable to the activity of T lymphocytes. When cultured with interleukin-2 (IL-2), the spleen cells from hepatectomized mice exhibited cytotoxicity to syngeneic lymphoblasts, which was found to be effected by T cells.

Animals↗
PubMed1984

Microsurgical anatomy of the region of the tentorial incisura.

The microsurgical anatomy of the tentorial incisura was evaluated in 25 adult cadavers using X 3 to X 40 magnification. The area surrounding the incisura is divided into the anterior, middle, and posterior incisural spaces. The anterior incisural space is located anterior to the brain stem and extends upward around the optic chiasm to the subcallosal area; the middle incisural space is located lateral to the brain stem and is intimately related to the hippocampal formation in the medial part of the temporal lobe; and the posterior incisural space is located posterior to the midbrain and corresponds to the region of the pineal gland and vein of Galen. The neural, cisternal, ventricular, and vascular relationships of each space were examined. The arterial relationships in the anterior incisural space and the venous relationships in the posterior incisural space are extremely complex, since the anterior incisural space contains all the components of the circle of Willis and the bifurcation of the internal carotid and basilar arteries, and the posterior incisural space contains the convergence of the internal cerebral and basal veins and many of their tributaries on the vein of Galen. The discussion reviews tentorial herniation and operative approaches to the incisura.

Brain↗
PubMed1984

Microsurgical anatomy of the anterior perforating arteries.

The anterior perforating arteries, the group of arteries that enter the brain through the anterior perforated substance (APS), were examined using X 3 to X 40 magnification in 50 cerebral hemispheres obtained from 25 adult cadavers. These arteries arose from the internal carotid, middle and anterior cerebral, and the anterior choroidal arteries. The carotid branches to the APS arose distal to the origin of the anterior choroidal artery. The anterior choroidal artery branches arose from the main or superior branch of the artery. The middle cerebral artery branches to the APS (the lenticulostriate arteries) arose from the M1 and M2 segments and were divided into medial, intermediate, and lateral groups, each of which had a characteristic configuration. The anterior cerebral artery branches arose from the A1 segment and from the recurrent artery. The internal carotid and anterior choroidal artery branches entered the posterior half of the central portion of the APS. The lenticulostriate branches entered the middle and posterior portions of the lateral half of the APS. The A1 segment gave rise to branches which entered the medial half of the APS above the optic nerve and chiasm. The recurrent artery sent branches into the anterior two-thirds of the full mediolateral extent of the APS. The relationship of these branches to the cerebral structures above the APS and to the common aneurysm sites is reviewed.

Carotid Arteries↗
PubMed1984

Phosphorylation of membrane proteins in monensin-resistant mutant of Chinese hamster ovary cell with altered insulin-receptor activity.

A Chinese hamster ovary (CHO) cell mutant resistant to the Na+/K+ ionophoric antibiotic, monensin, is partly defective in insulin-receptor activity. Growth of the monensin-resistant mutant required higher dose of insulin in defined medium than the parental CHO cell. Membrane proteins of CHO and a monensin-resistant clone, MonR-31, were compared for their capacity to be phosphorylated by endogenous phosphorylation enzyme in vitro in the absence or presence of insulin. Several membrane proteins of CHO were more highly phosphorylated as compared with MonR-31 in either the absence or presence of insulin.

Animals↗
PubMed1984

[Augmentation of NK activity in peripheral blood lymphocytes of cancer patients by intermittent GE-132 administration].

The natural killer (NK) activity of peripheral blood lymphocytes from 18 cancer patients was studied prior to and after multiple administration of organo-germanium compound (Ge-132). In successive oral administration of Ge-132 at a dose of 1000 mg/day for 10 days, NK-activity of patients was augmented at 3 days, but by 10 days, depression of NK activity was observed in all cases. In intermittent oral administration of Ge-132, however, more than half of the patients with augmented NK activity at day 3 maintained the high activity level at day 10. This result suggests the superiority of intermittent administration of Ge-132 for clinical use.

Colonic Neoplasms↗
PubMed1983

Increased surface binding sites of insulin in ML236B (compactin)-resistant mutants of Chinese hamster cell line.

Mutants resistant to ML236B (compactin) were isolated from the Chinese hamster lung V79 cell line (1). Three ML236B-resistant mutants, MF-1, MF-2 and MF-3, were enhanced in insulin-specific binding activity about 2 to 3 times over the parental V79 cell lines. Compared to V79, endocytosis of insulin was also increased 2 to 3-fold in ML236B-resistant mutants than V79. Scatchard analysis showed that 5,000 insulin binding sites per cell in V79 and 16,000 in a NL236B-resistant clone, MF-2. Insulin receptors in mutant and parental strains are down-regulated to a similar extent in the parental V79 treated with an excess insulin. This is the first somatic cell mutant with increased surface binding sites for insulin.

Animals↗
PubMed1983

Long terminal repeat sequences of intracisternal A particle genes in the Syrian hamster genome: identification of tRNAPhe as a putative primer tRNA.

We have determined the nucleotide sequences of long terminal repeat (LTR) regions of Syrian hamster intracisternal A particle (IAP) genes. The size of the LTRs was 350 base-pairs (bp) and 376 bp in two clones, H10 and H18, respectively. Two LTRs at both ends of the IAP gene were linked to directly repeating 6 bp hamster sequences. Many structural features common to the integrated retroviral LTRs such as "CAT" box, "TATAA" box, polyadenylation signal, and terminal inverted repeat (3 bp), were present on each LTR. The estimated length of R region (about 60 bp) was similar to that of the murine leukemia-sarcoma virus. In contrast, the calculated U5 region of 54 bp was the shortest among those of the retroviruses so far studied. Furthermore, from the analysis of primer binding sites, phenylalanine tRNA was for the first time identified as a presumed primer tRNA for reverse transcription. These results clearly distinguish Syrian hamster IAP LTRs from other retroviral ones. Based on the comparison of the sequences between Syrian hamster and laboratory mouse LTRs, the structural features peculiar to the IAP LTRs and the origin of the IAP genes are discussed.

Animals↗