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Biomedical subjects

T Ikeuchi

Publications and source records attributed to T Ikeuchi.

At least 199 records · Page 11Linked to original sources
PubMed1990

[Clinical studies on chronic prostatitis and prostatitis-like syndrome. (3). Clinical re-examination of chronic bacterial prostatitis using the criteria for clinical evaluation].

In accordance with the criteria for clinical evaluation, established by the UTI research group, 43 cases of chronic bacterial prostatitis were retrospectively analyzed. The subjective symptoms were "resolved" in 18.5%, "improved" in 46.5%, and "persisted" in 34.9%. The white blood cells were "cleared" in 34.9%, "decreased" in 37.2%, and "unchanged" in 27.9%. The bacteria were "eliminated" in 51.2%, "decreased" in 16.2%, "replaced" in 11.6%, and "unchanged" in 21.0%. Overall clinical efficacy was "excellent" in 51.2%, "moderate" in 39.5%, and "poor" in 27.9%, with an overall effectiveness rate of 72.1%. Bacteria (isolated bacteria: 8 species, 52 strains) were "eradicated" in 69.2% (GNR 71.4%, GPC 66.7%), and "persisted" in 30.8%. The bacterial eradication rate was 87.5% for E. coli, 58.3% for S. epidermidis, and 75.0% for E. faecalis. The analytical results of the clinical effects, classified by characteristic factor, showed significantly better results, in the excellence rate (p less than 0.05) and the overall effectiveness rate (p less than 0.01) of primary cases as compared with relapse cases. Among the isolated bacterial species, GNR showed more favorable results in comparison with GPC but without any significant difference. Further, the results of 81.3% for E. coli, 66.7% for S. epidermidis, and 62.5% for E. faecalis, indicates no significant difference between respective bacterial species. The new quinolones showed a favorable rate of 92%, followed by 80% of ST (sulfamethoxazole-trimethoprim), and 78% of tetracyclines, with a significant difference (p less than 0.01) in comparison with the mean overall effectiveness rates of cephems, penicillins, and old quinolones.(ABSTRACT TRUNCATED AT 250 WORDS)

4-Quinolones↗
PubMed1989

Loss of constitutional heterozygosity in colorectal tumors from patients with familial polyposis coli and those with nonpolyposis colorectal carcinoma.

Familial polyposis coli (FPC) is an autosomal dominant tumorigenic disorder, the major gene of which is mapped to chromosome 5q. We searched for a gene loss in colorectal tumors from FPC patients, as related to tumorigenesis by inactivation of tumor suppression genes, using restriction fragment length polymorphism analysis. The findings were compared with those in the case of nonpolyposis colorectal carcinomas (NPCC). We examined specimens from 39 FPC patients, including 21 adenocarcinomas and 49 adenomas, and 23 colorectal carcinomas from 22 NPCC patients. For this, we used 53 polymorphic DNA markers on all autosomes. Frequent loss of heterozygosity in colorectal carcinoma from FPC patients was observed on chromosomes 5 (24%), 14 (20%), 17 (31%), 18 (40%), and 22 (35%) and also on chromosomes 5 (32%), 14 (30%), 17 (27%), 18 (20%), and 22 (19%) in NPCC. Although loss of heterozygosity in adenoma from FPC patients was observed on nine chromosomes, the frequencies were less than 7%. As we fractionated tumors only macroscopically, actual frequencies of loss of heterozygosity are probably somewhat higher. However, these results do suggest that tumor suppression genes for colorectal carcinoma may locate on chromosomes 5, 14, 17, 18, and 22 and that they may play a critical role in carcinogenesis in both FPC and NPCC patients.

Adenoma↗
PubMed1989

Cholesteryl-conjugated oligonucleotides: synthesis, properties, and activity as inhibitors of replication of human immunodeficiency virus in cell culture.

A family of oligonucleotides and phosphorothioate oligonucleotide analogues was synthesized with a cholesteryl group tethered at the 3'-terminal internucleoside link. This modification, introduced to enhance interaction of the polyanions with cell membranes, significantly increases the antiviral activity of the oligomers, as judged by inhibition of syncytia formation and expression of viral proteins p17, p24, and reverse transcriptase for human immunodeficiency virus 1 in Molt-3 cells. In the most favorable case, with a 20-mer cholesteryl-phosphorothioate derivative, complete inhibition by all assays was obtained with an oligomer concentration of 0.2 microM. Even decamers were active, and some antiviral activity was observed for a heptanucleotide cholesteryl-phosphorothioate derivative, which binds very poorly to complementary oligonucleotides. These facts, and the finding that the activity of the phosphorothioate decamers does not correlate with a specific sequence, suggests that a mechanism other than "antisense inhibition" may be operative in these systems.

Antiviral Agents↗
PubMed1989

Inhibition of human immunodeficiency virus in early infected and chronically infected cells by antisense oligodeoxynucleotides and their phosphorothioate analogues.

Antisense oligodeoxynucleotides, both the phosphorothioate analogues and unmodified oligomers of the same sequence, inhibit replication and expression of human immunodeficiency virus already growing in tissue cultures of MOLT-3 cells with much greater efficacy than do mismatched ("random") oligomers and homooligomers of the same length and with the same internucleotide modification. This preferential inhibitory effect is elicited in as short a time as 4-24 hr postinfection. Likewise, antisense oligomers exhibit greater inhibitory effects on human immunodeficiency virus in chronically infected cells than do mismatched oligomers and homooligomers. Phosphorothioate antisene oligomers are up to 100 times more potent than unmodified oligomers of the same sequence in these inhibitory assays. These results, in major respects, confirm and extend those recently published by Matsukura et al. [Matsukura, M., Zon, G., Shinozuka, K., Robert-Guroff, M., Shimada, T., Stein, C. A., Mitsuza, H., Wong-Staal, F., Cohen, J. S. & Broder, S. (1989) Proc. Natl. Acad. Sci. USA 86, 4244-4248]. They also point out the importance of computer analysis of sequences though to be random but that in reality contain significant areas of likely hybridization, either to the viral genome or to the complementary DNA strand synthesized from it. They thus reinforce the concept that specific base pairing is a crucial feature of oligonucleotide inhibition of human immunodeficiency virus.

Antiviral Agents↗
PubMed1989

Effect of solubilizer on the metabolic fate of menaquinone-4 in rats.

Following intravenous administration to rats of all-trans [14C]menaquinone-4 solubilized with purified soybean lecithin [L] or with HCO-60 [H], we examined the effect of the solubilizers on the distribution and excretion of menaquinone-4 [MQ-4]. The level of radioactivity in the liver after dosing with L was about 2 times higher than in dosing with H, and a similar result was obtained in the hepatic microsomal fraction, a target of MQ-4. The rate and amount of biliary excretion of radioactivity after dosing with L were greater than in dosing with H. In addition, the uptake of [14C]MQ-4 by the isolated perfused rat liver was greater with L than H, consistent with the in vivo observation. Further, upon incubation of L or H with hepatic microsomes, the MQ-4 metabolizing enzyme was more highly active toward L than H. These results show that L is more easily transported to the target region, and more rapidly metabolized and excreted into the bile than H, suggesting that the lecithin-solubilized preparation of MQ-4 may be more effective clinically.

Animals↗
PubMed1989

Activity changes in cranberry bean (Phaseolus vulgaris) alpha-amylase inhibitor by chemical modification and enzymatic digestion.

An alpha-amylase inhibitor was prepared from cranberry bean (Phaseolus vulgaris). The alpha-amylase inhibitor was composed of three different subunits not linked by disulfide bridges and only one of them contained carbohydrate. Although the inhibitor was stable at pH 3 to 7, it was heat labile at pH 3 and 5. Chemical modification of the amino groups and the guanido groups in cranberry bean alpha-amylase inhibitor molecule resulted in rapid loss of the inhibitory activity, respectively. Oxidation of the tryptophan residues also led to loss of the activity. On the other hand, reductive methylation of the amino groups scarcely affected the activity. The inhibitor was quite resistant to the proteolytic digestions by pepsin and trypsin, while it was relatively susceptible to the action of chymotrypsin.

Electrophoresis, Polyacrylamide Gel↗
PubMed1989

[Clinical studies of subcapsular orchiectomy with an intracapsular testicular prosthesis--improving the quality of life in patients with prostatic cancer].

Twenty-five patients termed the method group, having a carcinoma of the prostate, underwent a subcapsular orchiectomy, followed by the placement of an intracapsular prosthesis for anti-androgen treatment. In tandem, a control group of 16 patients, having a carcinoma of the prostate underwent, a total orchiectomy. Further, a histological study of a testicular capsula was performed on an autopsy specimen, but almost no seminiferous residue was detected. Postoperatively, serum testosterone levels decreased to less than 10% of their Preoperative levels, and remained at this level for 30 months. Similar results were obtained in both the method group and the control group postoperative questionnaires showed that the method group experienced less mental and physical stress than did the control group. In a society composed largely of elderly people, this type of operation can be very beneficial to those suffering from prostate carcinoma in maintaining the quality of their lives.

Aged↗
PubMed1989

Decreased high-affinity epidermal growth factor receptors in psoriatic epidermis.

Using 125I-EGF the distribution of EGF receptors in psoriatic epidermis was autoradiographically examined. Binding sites of 125I-EGF (20 ng/ml) were mainly located at basal and suprabasal cells in normal and uninvolved psoriatic epidermis, whereas they were located at spinous cells as well as at basal and suprabasal cells in affected psoriatic epidermis. Binding of 125I-EGF (1 ng/ml), on the other hand, was observed in normal and uninvolved psoriatic epidermis but not in affected psoriatic epidermis. The majority of EGF receptors in affected psoriatic epidermis were featured by low affinity for EGF.

Autoradiography↗
PubMed1989

[Prophylactic effect of fosfomycin on CDDP nephrotoxicity].

From 1985 to 1986, cisplatin (CDDP) therapy was performed 61 times in 24 patients with urological cancer. Thirty nine courses used fosfomycin (FOM) 4 g/day from the day before CDDP administration to the last dose of CDDP, and we statistically evaluated the prophylactic effect of FOM on CDDP nephrotoxicity using urinary NAG and FENa as parameters (t-test). In the 1-day CDDP group (CDDP 60-70 mg/m2 x 1 day) with FOM a peak NAG was seen on the 1st day but no significant NAG change, FENa has a peak on the 1st day, no significant increase between the previous and the 1st day, but a significant decrease was seen between the 3rd and the 5th day (p less than 0.05). In the 5-day CDDP group (CDDP 20 mg/m2 x 5 day) NAG reached a peak level on the 5th day with FOM, showed significant increase (p less than 0.05; between the previous and the 5th day) and decrease (p less than 0.01; between the 6th and the 14th), compared to those without FOM. FENa change tended to be similar, showing a significant increase, (p less than 0.05; between the 2nd and 4th) and decrease (p less than 0.05; between the 4th and 7th) with FOM but no significant change without FOM. NAG changes with FOM were classified by pre-CDDP dose creatinine clearance (Ccr, ml/min) into 3 groups (under 50, 50-100, over 100). In the 1-day CDDP group with any Ccr no significant NAG change obtained, but, in the 5-day CDDP group with 50-100 Ccr seen a NAG peak on the 6th day, significant increase (p less than 0.05; between the previous and the 6th) and decrease (p less than 0.05; between 6th and 12th). With over 100 Ccr NAG has 4th day peak, significant increase (p less than 0.05; between the previous and the 4th), and decrease (p less than 0.05; between 4th and 8th). A prophylactic effect of FOM on CDDP nephrotoxicity was found in the 5-day CDDP group not in the 1-day CDDP group, using urinary NAG and FENa. PVB and single CDDP regimen (5 day CDDP group) with FOM can be performed safely, if the pre-CDDP dose Ccr is over 50.

Acetylglucosaminidase↗
PubMed1988

Loss of constitutional heterozygosity in colon carcinoma from patients with familial polyposis coli.

Recent studies have suggested a critical role of specific gene loss in several embryonic tumours and certain adult cancers. In retinoblastoma, hemizygosity or homozygosity of a recessive mutant allele results in the loss of normal gene product, and this seems to cause the manifestation of the disorder. Familial polyposis coli (FPC) is a human autosomal dominant trait characterized by numerous adenomatous polyps of the colon and rectum, and a high incidence of colon carcinoma. Karyotype analyses have failed to detect specific deletion or translocation. We report the use of polymorphic DNA markers to look for the somatic loss of heterozygosity at specific loci. Investigation of 38 tumours from 25 FPC patients, and 20 sporadic colon carcinomas from 19 patients, revealed frequent occurrence of allele loss on chromosome 22, with some additional losses on chromosomes 5, 6, 12q and 15. The FPC gene-linked DNA probe C11p11 also detected frequent allele loss in both familial and sporadic colon carcinomas but not in benign adenomas. These results suggest the possible involvement of more than one chromosomal locus in the development of familial and sporadic colon carcinomas.

Adenoma↗
PubMed1988

B-cell lineage acute lymphoblastic leukemia with i(7q) and t(9;9)(p22;p24).

A 61-year-old Japanese male with acute lymphoblastic leukemia (ALL) is reported. Surface marker examinations revealed that the leukemic cells were of a B-cell lineage; the cells had common ALL antigens, Ia-like antigens, and B1 and B4 antigens. Chromosome analysis showed abnormalities of t(9;9)(p22;p24), as well as an isochromosome for the long arm of chromosome 7. The heritable fragile site at 9p was not detected in the peripheral blood cells of this patient at remission phase.

Antigens, Neoplasm↗
PubMed1988

Inhibition of acquired immunodeficiency syndrome virus by oligodeoxynucleoside methylphosphonates.

Antisense oligodeoxynucleotides containing internucleoside methylphosphonate linkages were examined for their ability to inhibit human immunodeficiency virus (HIV)-induced syncytium formation and virus expression. HIV inhibitory activity was found to be dependent on both chain length and the number of phosphonate residues. Introduction of 18 phosphonate groups in an oligomer of chain length 20 significantly increased HIV inhibitory activity relative to the parent oligonucleotide, whereas 5 such groups showed little or no increase in the HIV inhibition capacity. Methylphosphonate-linked oligomers are more stable to nuclease degradation and hence could be potentially useful in the treatment of acquired immunodeficiency syndrome.

Amino Acid Sequence↗
PubMed1988

Rearrangements of chromosome 3 in nonfamilial renal cell carcinomas from Japanese patients.

Cytogenetic studies were successfully carried out in 5 tumor tissues from Japanese patients with nonfamilial renal cell carcinoma, histologically diagnosed as clear cell subtype. Mitotic cells were obtained by a combined method of enzymatic disaggregation and short-term culture (6-12 days). The modal chromosome numbers were found to be diploid or near-diploid in all the cases examined. Every case showed characteristic structural and numerical abnormalities. Rearrangements in the short arm of chromosome 3 were observed as clonal abnormalities in all the cases, including a translocation t(3;6) resulting in a partial loss of 3p (3 cases), a terminal deletion of 3p (one case) and 2 different translocations involving 3p and 8p (one case). The other clonal abnormalities were a whole or partial trisomy of chromosome 7 and a loss of Y chromosome. The overall results in the present study were consistent with those of our previous data in American patients, and suggest that the rearrangements of chromosome 3 leading to a partial loss of its short arm may play primary and significant role(s) in the development of renal cell carcinoma.

Aged↗
PubMed1988

Distal trisomy of chromosome 17q due to inverted tandem duplication.

A female infant with distal trisomy 17q is described. The anomaly resulted from a de novo inverted duplication of the 17q2405----q25.3 region as defined by high-resolution banding. The proband's overall clinical picture was in good agreement with those of previously reported cases of partial trisomy 17q. The phenotypic features relatively common to our and other reported cases, included mental and growth retardation, microcephaly, temporal retraction, blepharophimosis, saddle nose, thin upper lip, down-turned corner of the mouth, high-arched palate, low-set and deformed ears, webbed neck and lowered posterior hairline. A unique feature of the present case was systemic hirsutism.

Abnormalities, Multiple↗
PubMed1988

Characterization of a polypeptide-dependent membrane protein kinase that specifically phosphorylates NS protein of vesicular stomatitis virus in vitro.

Phosphorylation of membrane-associated proteins by protein kinases in the membrane fraction from HeLa S3 cells was rapidly increased when the cells were infected with vesicular stomatitis virus (VSV). SDS-PAGE followed by autoradiography revealed polypeptides with molecular sizes of Mr. 53,000, 44,000, 42,000, 35,000, 30,000 and 27,000 in the kinase fraction from uninfected cells to be highly phosphorylated. Virus-coding NS protein (Mr. 40,000) was phosphorylated when the membrane fraction from virus-infected cells was incubated with [gamma-32P]ATP in the presence of histone H1 and Mg2+. Under these conditions, histone H1 functioned as a stimulator for NS protein phosphorylation by the kinases. One (kinase III) of the membrane-associated kinases was partially purified from HeLa S3 cells using FPLC (type Mono Q) after DEAE-cellulose column chromatography. The enzymatic properties of kinase III were similar to those reported for a polypeptide-dependent protein kinase (protein kinase P), because (a) both kinases highly phosphorylated beta-casein, although no phosphorylation was observed with histones; (b) several endogenous substrates from HeLa S3 cell membrane were phosphorylated by the kinases in the presence of basic proteins, such as histones, protamine and poly-Lys; (c) their activity was insensitive to a low concentration (19 micrograms/ml) of heparin, which highly inhibited casein kinase II activity; and (d) the kinases were extractable from the plasma membrane using Triton X-100. In addition, provided evidence suggests that kinase III may play an important role in an early stage of VSV replication through its specific phosphorylation of NS protein and membrane proteins in virus infected cells.

Animals↗
PubMed1988

Studies on the enhanced effect of acupuncture analgesia and acupuncture anesthesia by D-phenylalanine (first report)--effect on pain threshold and inhibition by naloxone.

It has been claimed that the mechanism of acupuncture analgesia can be explained in part by endogenous opioids. If so, it might be possible to enhance the analgesic effect of acupuncture by the administration of endorphins. If D-phenylalanine (DPA), an inhibitor of the endorphin degrading enzyme, is administered, the analgesic effect of acupuncture should be prolonged due to the increased level of endorphins. From the changes of the pain threshold (PT), we investigated whether or not the pre-administration of DPA can enhance the analgesic effect of acupuncture in humans. In addition, we examined the inhibitory effect of naloxone. 1) In all five subjects whose PT was raised after acupuncture anesthesia (respondents), the rise in PT was significantly prolonged by DPA. 2) Out of 10 subjects whose PT remained almost unchanged after acupuncture anesthesia (non-respondents), the PT was increased by DPA in 5 cases. 3) The rise in PT was most prominent when DPA was administered 30 minutes before the start of acupuncture anesthesia. 4) In all 4 respondents in whom the rise in PT persisted after DPA and acupuncture anesthesia, their raised PT dropped after the intravenous injection of naloxone (10 mg). 5) These findings show that DPA enhances the analgesic effect of acupuncture by the "endorphin mechanism."

Acupuncture Therapy↗