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K Inai

Publications and source records attributed to K Inai.

98 records · Page 6Linked to original sources
PubMed1984

Estrogen-producing adrenocortical carcinoma. A light and electron microscopic study.

A case of adrenocortical carcinoma with feminization seen in a man aged 35, is reported. The levels of estron (E1) and estradiol (E2) in the venous blood draining the tumor were high, and it was confirmed by in vitro assay of tumor cells taken from the primary tumor of the left adrenal gland that the tumor produced estrone. The light microscopic examination demonstrated that the primary tumor was composed of mixture of large cells with pleomorphic nuclei and vacuolated cytoplasm and uniform cells with ovoid nuclei and eosinophilic cytoplasm. The electron microscopic examination on the latter cells revealed numerous large and irregularly shaped mitochondria with mostly tubular or lamellar and occasionally vesicular cristae and electron-dense matrix, well-developed smooth-surfaced endoplasmic reticulum in the cytoplasm. However, lipid droplets and lysosomes or lipofuscin granules were scanty. From these findings, it is suggested that cells of the present tumor have characteristics of those in the zona reticularis of the adrenal cortex as well as in the fetal cortex, and the functional property of this tumor is well correlated with its morphological features.

Adrenal Cortex Neoplasms↗
PubMed1984

[Spindle cell carcinoma of the penis--a case report].

Over a 2-month period, a 34-year old man with phimosis developed a pedunculated tumor, measuring 4 X 2.5 X 2 cm in his glans penis. Microscopically the bulk of the tumor was composed of spindle-shaped cells, however, at some parts of the tumor, squamous cell cysts or nests, consistent with well-differentiated squamous cell carcinoma, were noted. Atypical epithelial cells merged imperceptibly with the underlying spindle-shaped cells. The histological diagnosis of spindle cell carcinoma, an uncommon variant of squamous cell carcinoma, was made. Spindle cell carcinoma arising from the penis is very rare and only two reports are available at present.

Adult↗
PubMed1979

Chronic toxicity of sodium nitrite in mice, with reference to its tumorigenicity.

Sodium nitrite has been widely used as one of the most effective food additives to tinge color on cured meat. However, it has been elucidated that this chemical is not merely a precursor of N-nitroso compounds, many of which are strongly carcinogenic, but also a mutagenic substance in biological tests. In order to ascertain the possible tumorigenicity of sodium nitrite itself, chronic toxicity of the agent in mice, by means of daily oral administration as drinking water for more than 18 months, in the concentration of 0.5 (maximum tolerated dose), 0.25, and 0.125%, was tested. As a result, development of various tumors, including thymic lymphoma, nonthymic lymphoid leukemia, pulmonary adenoma and carcinoma, and benign and malignant tumors in soft tissue, was seen in these mice. However, as to the incidence of tumors as well as the developmental time of each histologically classified tumor, no apparent difference was detected between those in the experimental groups and the control group.

Animals↗
PubMedDate not supplied

p53 mutations in lung cancers from non-smoking atomic-bomb survivors.

Tobacco smoke contains many carcinogens and has been linked with the development of lung cancer. We sequenced the conserved regions of the p53 tumour suppressor gene in lung cancers from 17 non-smokers from Hiroshima, Japan; 9 were atomic-bomb survivors. The mutations were predominantly transitions (all G:C to A:T); there were no G:C to T:A transversions. By contrast, lung cancers from 77 Japanese smokers have a predominance of G:C to T:A transversions in which the guanine residues occur on the non-transcribed DNA strand. These findings further implicate tobacco smoke carcinogens in the molecular pathogenesis of lung cancer.

Adult↗
PubMedDate not supplied

Multidrug resistance due to impaired DNA cleavage in a VP-16-resistant human leukemia cell line.

We established a VP-16-resistant line of human leukemia cells, K562/VP-H2, derived from K562 cells. K562/VP-H2 cells were 44-fold more resistant to VP-16 than were K562 cells. K562/VP-H2 cells were also resistant to doxorubicin, daunorubicin and mitoxantrone, but showed little or no resistance to vincristine, aclarubicin, idarubicin, idarubicinol, cytosine arabinoside, cis-platinum or camptothecin. K562/VP-H2 cells did not over-express P-glycoprotein or multidrug resistance protein, and showed intracellular accumulation of VP-16 similar to that in K562 cells. While the expressions of topoisomerase II-alpha gene and topoisomerase II-beta gene, or catalytic activity in nuclear extract of K562/VP-H2 cells were similar to that of K562 cells, the VP-16 induced DNA cleavage was reduced in K562/VP-H2 cells compared to K562 cells, suggesting that the reduction of topoisomerase II-mediated DNA cleavage through qualitative alteration of topoisomerase II may be the main mechanism of acquired multidrug resistance for K562/VP-H2 cells. The K562/VP-H2 cell line is an interesting model for studying resistance to antileukemia drugs targeting topoisomerase II.

Antineoplastic Agents, Phytogenic↗
PubMedDate not supplied

Molecular remission induced by fractionated dose-escalating donor leukocyte infusion without graft-versus-host disease in a patient with chronic myelogenous leukemia relapsed after allogeneic bone marrow transplantation.

A 39-year-old male with CML who relapsed 5 years and 8 months after allogeneic bone marrow transplantation achieved complete molecular remission following fractionated dose-escalating donor leukocyte infusions. Acute or chronic graft-versus-host disease (GVHD) did not occur and the patient remained asymptomatic throughout treatment. Since no prophylaxis against GVHD was administered, this case indicated that the graft-versus-leukemia effect is entirely separate from GVHD in certain conditions.

Adult↗