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Biomedical subjects

T Kodama

Publications and source records attributed to T Kodama.

At least 721 records · Page 40Linked to original sources
PubMed1989

[Adrenal incidentaloma--report of 14 operated cases and analysis of 4-year autopsy series of Japan].

During the last 7 years, operation was performed for 94 cases of adrenal tumor in our series, of which 14 were incidentally found by abdominal computed tomography or echography. They included 9 cases of pheochromocytoma, 1 of Cushing's syndrome, 3 of ganglioneuroma and 1 of cortical adenoma. Five of 9 pheochromocytoma cases were devoid of hypertension, but all 9 cases had abnormally high levels of urinary catecholamines and/or their metabolites. The 4-year autopsy series of Japan (1980-1983) included about 153,000 cases. Except the metastatic tumors, the following lesions were incidentally found in the adrenal gland: 310 of cortical adenoma, 153 of cortical hyperplasia, 39 of pheochromocytoma and 17 cases of neurogenic tumors. Some of the cortical adenomas are presumed to be more than 1 cm in diameter. So, they are expected to be found incidentally, more frequently in the future. Surgery is not necessary for most of them, except for functioning tumors. Most of the pheochromocytomas are presumed to be hormonally active, and should be treated surgically. It is probable that these functioning tumors had been missed clinically, especially in the elderly persons. Neurogenic tumors and myelolipomas may be left in place, when malignancy can be ruled out.

Adenoma↗
PubMed1989

Quantitation of high molecular weight protein aggregates in opaque and transparent parts from the same human cataractous lens.

Water soluble proteins from clear and opaque parts of the cortex of the same human cataractous lens were analyzed by high pressure liquid chromatography using a TSK 3000 SW gel filtration column. Studies of the 42 different microdissected parts from 7 different lenses demonstrated that the opaque parts possessed a higher percentage of high molecular weight material eluting with the void volume than did the corresponding clear part from the same lens. These results suggest that increased amounts of high molecular weight protein aggregates accompany the process of opacification in the cortex of the human cataractous lens.

Aged↗
PubMed1989

Use of infectious molecular clones of simian immunodeficiency virus for pathogenesis studies.

Three infectious molecular clones of SIVmac and one of HIV-2 exhibit remarkable variation in their biological properties despite similarities in genome organization and sequence relatedness. Cloned viruses differed in their ability to grow in various cultured cells, in their ability to infect macaques, and in the location of the env stop codon. Sequences from the 3' end predict that at least three of the four clones do not have an intact, functional nef gene. All four cloned viruses yield infectious virus in HUT-78 and all four cloned viruses are cytopathic.

Animals↗
PubMed1989

[Heterogeneity of human cataractous lens low molecular weight crystallins--study of concanavalin A binding proteins by two-dimensional electrophoresis].

Low molecular weight proteins (beta s, gamma H and gamma L crystallins) were fractionated from human cataractous lens using gel filtration of Sephadex G-75 column chromatography. Each crystallin was separated by two-dimensional electrophoresis and identified by Coommassie blue staining and Concanavalin A binding. Several components of beta s, gamma H and gamma L-crystallins stained with Coomassie blue did not bind with Concanavalin A. Two-dimensional electrophoresis revealed heterogeneities of all three low molecular weight crystallins. This phenomenon may be due to differences in the amount of bound glucose and mannose.

Aged↗
PubMed1989

[Effect of morphine in cancer pain].

The usefulness of oral morphine to alleviate pain has been tested in 70 patients with cancer. The efficacy was found to be 87% (61/70). The starting dose was 10 mg/d-12 mg/d (mean 36 mg/d), and the maximum dose was 10 mg/d-3,600 mg/d. Twenty four of these patients were able to stay at home or go to the hospital for dose treatment. In 27 patients, oral morphine dose were able to administrated until death. Although vomiting and constipation were frequent side effects, the administration of adjuvant drugs relieved these symptoms. It was found that these oral morphine doses did not shorten a patient's life span. Thus we have concluded that oral morphine proved a useful, safe, and convenient drug for the control of cancer pain.

Administration, Oral↗
PubMed1988

Methods for analysis of urinary glycosaminoglycans.

Methods for the analysis of urinary GAGs that can be used for or are applicable to routine assays are described. The most popular method for isolation of GAGs from a urine sample is CPC precipitation, in spite of the fact that it is time-consuming. To identify the different types of GAGs excreted, separation by one-dimensional cellulose acetate electrophoresis followed by staining with alcian blue or toluidine blue may suffice for routine purposes. Solvents such as barium acetate, calcium acetate, barbital buffer and pyridine-formic acid are used for the separation. However, the separation of the seven types of GAGs by conventional one-dimensional electrophoresis is difficult, and a discontinuous electrophoretic method with barium acetate buffer and barium acetate buffer containing ethanol has proved effective for the separation. HPLC separation methods are used for assaying the profiles of enzymatic digestion products of GAGs. Advanced HPLC methods for separating intact GAGs of different types are currently unavailable. Unsaturated disaccharides produced with heparitinase and/or heparinase from heparan sulphate and oligosaccharides produced by hyaluronidase digestion of hyaluronic acid can be separated by HPLC. For chondroitin sulphate isomers, unsaturated disaccharides produced by digestion of the samples with chondroitinase ABC or chondroitinase AC are separated by HPLC and determined by their UV absorbance or by fluorescence labelling. Highly sensitive quantitation of chondroitin sulphate isomers is possible by these methods, which are also efficient for the investigation of the constituents of GAG polymers. Some of these methods have been applied to urine samples from patients with, e.g., mucopolysaccharidoses.

Animals↗
PubMed1988

Increased levels of messenger ribonucleic acid for apolipoprotein E in the spleen of probucol-treated rabbits.

To study the organ-specific effect of probucol, a potent cholesterol-lowering drug, on apolipoprotein(apo)E synthesis, rabbit apoE complementary deoxyribonucleic acid (cDNA) clones were isolated and apoE messenger ribonucleic acid (mRNA) levels were determined in various tissues isolated from probucol-treated rabbits. A 0.54 kb apoE cDNA was cloned from a rabbit liver cDNA library using a synthetic oligonucleotide probe. The amino acid sequence deduced from an apoE coding region indicated 78% homology for human apoE and 63% homology for rat apoE. RNA blot analysis showed that apoE mRNA was most abundant in the liver, then in the brain and spleen. The relative amounts of apoE mRNA were determined in tissues of rabbits fed a normal diet, or high-cholesterol (1%) diet with or without probucol (1%). ApoE mRNA levels increased 2- to 4-fold in the spleen and brain after cholesterol feeding for 4 weeks and were higher by 52 to 70% in the spleen of probucol-treated rabbits than in nontreated rabbits. This induction of apoE mRNA occurs within 7 days after the initiation of probucol treatment. However, apoE mRNA levels in the liver, a major apoE-synthesizing organ, were not enhanced after probucol treatment. These results indicate that probucol induces apoE mRNA expression specifically in the spleen and may affect apoE-mediated lipoprotein metabolism, the so-called reverse cholesterol transport.

Amino Acid Sequence↗
PubMed1988

Histopathologic prognostic factors in adenocarcinomas of the peripheral lung less than 2 cm in diameter.

The histologic prognostic factors of pulmonary adenocarcinomas of the lung less than 2 cm in diameter were analyzed in 75 patients who had undergone surgical resection. The pathologic stage, lymph node involvement, and pleural involvement were found to be the major determinants of prognosis (P less than 0.01). In addition, other single factors, such as tumor differentiation (P less than 0.01), vascular invasion (P less than 0.01), the degree of collagenization in the fibrotic focus (P less than 0.01), the standard deviation (SD) of nuclear areas (P less than 0.05), and mitotic index (P less than 0.05) correlated significantly with prognosis by the log-rank test on the Kaplan-Meier survival curves of these factors. Patients with dense infiltration of "T-zone histiocytes" survived significantly longer than those with less infiltration (P less than 0.05). Cox's proportional hazard general linear model analysis showed the importance of factors, such as lymph node or pleural involvement and the SD of nuclear area, when the pathologic stage was excluded, and of the mitotic index when all four factors were excluded to emphasize the cellular characteristics. It is possible to predict the postoperative prognosis of patients with small pulmonary adenocarcinoma more precisely by combination of the above histopathologic factors.

Adenocarcinoma↗
PubMed1988

Covalent change in alpha crystallin during human senile cataractogenesis.

The high molecular weight aggregates (HMWA) obtained from normal and cataractous human lens nuclei have been resolved by SDS-polyacrylamide gel electrophoresis, and the alpha crystallin band has been probed with antisera made against the whole alpha crystallin molecule and with antisera made against synthetic peptides of alpha crystallin (alpha A2 147-161 and alpha A2 163-173). Quantitation of these antisera binding demonstrated that the anti-alpha A2 163-173 serum and the anti-alpha whole sera bound equally well to the alpha crystallin band from the HMWA fraction from normal and cataractous lenses. In contrast, the anti-alpha A2 147-161 serum bound little, if at all, to alpha crystallin from normal lenses, while it bound well to alpha crystallin from cataractous lenses. These results demonstrate a covalent alteration in the alpha crystallin molecule, and suggest a possible location of a covalent change that may occur during the cataractogenic process in the aged human lens.

Aged↗
PubMed1988

Isolation of simian immunodeficiency virus from African green monkeys and seroepidemiologic survey of the virus in various non-human primates.

Sixteen isolates of simian retrovirus closely related to human immunodeficiency virus (HIV) were obtained from healthy African green monkeys (AGM) (Cercopithecus aethiops). The first isolate was obtained from a monkey seropositive for HIV, and the others were isolated from monkeys harboring antibodies to the first isolate. These simian retroviruses were referred to as simian immunodeficiency virus from AGM, SIV[AGM], due to their cross-reactivities with HIV structural proteins. These SIV[AGM] isolates were found by Western blotting analysis to have virus-specific proteins of 120, 66, 55, 32-40, 24 and 17 kDa, which were all similar in size to the analogous proteins of HIV. Putative gag proteins of p55, p24 and p17 were recognized by sera of human AIDS patients, but the corresponding env proteins of 32-40 and 120 kDa showed only weak cross-reactivity with those of HIV. The transmembrane glycoproteins of these 3 SIV[AGM] isolates showed size heterogeneity, being 32, 35 and 40 kDa. This virus had particles that were morphologically similar to those of HIV, and had Mg2+-dependent reverse transcriptase. Furthermore, the SIV[AGM] showed tropism and cytopathic effects on CD4-positive human cell lines. In a sero-epidemiological survey of SIV[AGM] in various non-human primates, 2 other African monkey species, the mandrill and de Brazza's monkey, were also found to have antibodies to SIV[AGM]. These HIV-related simian retroviruses will be important in determining the origin and transmission of HIV group viruses, and may provide useful animal models for studies on the infection and pathogenesis of HIV and AIDS.

Animals↗
PubMed1988

Autoradiographic study on healing process of cysteamine-induced duodenal ulcer in rat. Possible importance of Brunner's glands in ulcer healing.

The healing process of cysteamine-induced duodenal ulcer was studied by [3H]thymidine autoradiography. After the development of ulcer in the duodenum, cell proliferation was markedly activated not only in the crypts but also in the Brunner's glands near the ulcer. In the initial stages of ulcer healing, they both contributed to form the surface covering regenerating epithelium. Granulation tissue also proliferated at the base of the ulcer. In later stages of ulcer healing, new crypts were formed in the floor of the ulcer. New villi regenerated from these crypts and Brunner's glands regenerated by proliferation in situ. The ulcer base then was completely covered with new villi and granulation tissue was replaced by dense fibrous connective tissue. The present study suggested that the Brunner's glands, together with the crypts of Lieberkühn, play an important role in the healing process of cysteamine-induced duodenal ulcer.

Animals↗