3101
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Abstract
Supra-threshold responses of neurons in the primary auditory cortex of the macaque monkey are so complex that the characteristic frequency cannot be determined. By statistical analyses based on analysis of variance and principal component analysis, we demonstrated that the similarity of neurons from penetration perpendicular to the surface of the cortex decreases to such a level that they cannot be considered as a unit and that correlation among neurons from different cortical positions can be higher than that for neurons from penetration. This means that the frequency map is not evident for stimuli at supra-threshold. Moreover, we found that a single neuron utilizes different time segments to extract different physical aspects of stimuli. Our results indicate that encoding auditory information may involve other structures than the frequency map.
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3102
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Takeda A, Yamamoto T, Nakamura Y, Takahashi T, Hibino T. Squamous cell carcinoma antigen is a potent inhibitor of cysteine proteinase cathepsin L. FEBS Lett 1995; 359:78-80. [PMID: 7851535 DOI: 10.1016/0014-5793(94)01456-b] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A squamous cell carcinoma antigen (SSCA), which is a member of the serpin family of proteinase inhibitors, was purified from sera of cancer patients. It did not inhibit serine proteinases. However, it non-competitively inhibited human cathepsin L with a Ki of 0.064 nM, but not cathepsins B and H among cysteine proteinases. These results indicated that SCCA is a non-functional serpin that inhibits cathepsin L in cancer cells.
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3103
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Ohnishi J, Takahashi T. Occurrence of a latent serine protease in the follicular fluid of porcine ovary. Zoolog Sci 1995; 12:87-90. [PMID: 7795494 DOI: 10.2108/zsj.12.87] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Porcine ovary follicular fluid contains a latent form of a protease which is activatable with trypsin. The active enzyme hydrolyzed peptide 4-methylcoumaryl-7-amide (MCA) substrates with a preference for the Arg-MCA bond. The enzyme was strongly inhibited by diisopropylfluorophosphate, aprotinin, leupeptin and antipain, but not by soybean trypsin inhibitor. The apparent molecular weight of the enzyme was approximately 630,000 as estimated by gel filtration. No significant difference in molecular size was seen between the inactive precursor and trypsin-activated enzyme. The results suggest that the present enzyme is a novel type of serine protease.
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3104
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Sakakura C, Hagiwara A, Tsujimoto H, Ozaki K, Sakakibara T, Oyama T, Ogaki M, Takahashi T. The anti-proliferative effect of proliferating cell nuclear antigen-specific antisense oligonucleotides on human gastric cancer cell lines. Surg Today 1995; 25:184-6. [PMID: 7772926 DOI: 10.1007/bf00311097] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The proliferating cell nuclear antigen (PCNA) is a nuclear protein that leads DNA synthesis by the DNA polymerase delta. As the PCNA gene is strongly expressed in invasive gastric cancer cells with high proliferative activity, PCNA is suspected of playing an important role in the proliferation and advancement of gastric cancer. Thus, the effects of antisense oligonucleotides specific for PCNA mRNA were examined in seven gastric cancer cell lines. It was found that treatment with antisense oligonucleotides at concentrations of 10-40 microM dose-dependently inhibited the growth of all cell lines; however, random sequence oligonucleotides did not modify the proliferation of any type of cells. These results indicate that PCNA is essential for cell proliferation in gastric cancer cells, and that the growth inhibitory effect results from the inhibition of PCNA gene expression. Therefore, PCNA-specific antisense oligonucleotides may be effective in the treatment of gastric cancer.
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3105
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Washimi O, Nagatake M, Osada H, Ueda R, Koshikawa T, Seki T, Takahashi T, Takahashi T. In vivo occurrence of p16 (MTS1) and p15 (MTS2) alterations preferentially in non-small cell lung cancers. Cancer Res 1995; 55:514-7. [PMID: 7834619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Frequent homozygous deletions of the p16 (MTS1) gene encoding a cyclin-dependent kinase inhibitor were recently reported in various tumor cell lines including examples derived from lung cancers, but direct evidence for their occurrence in lung cancer patients has not been reported thus far. In the present study, alterations of p16 and/or p15, a p16-related cyclin-dependent kinase, were observed not only in lung cancer cell lines but also in the corresponding tumor specimens in vivo, excluding the possibility of in vitro artifacts. Interestingly, a clear specificity was also noted in terms of the affected histological subtype; i.e., only non-small cell lung cancers carried alterations (6 of 20 as compared to 0 of 20 small cell lung cancer cell lines).
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3106
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Orozco H, Mercado MA, Takahashi T, Prado E, Rojas G. Injection sclerotherapy in patients with extrahepatic portal venous obstruction. Ann Surg 1995; 221:205-6. [PMID: 7857151 PMCID: PMC1234960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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3107
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Ide S, Kawahara K, Takahashi T, Sasaki N, Shingu H, Nagayasu T, Yamamoto S, Tagawa T, Tomita M. Donor administration of PAF antagonist (TCV-309) enhances lung preservation. Transplant Proc 1995; 27:570-3. [PMID: 7879103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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3108
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Takahashi T, Nakano S, Shimazaki Y, Kaneko M, Nakahara K, Miyata M, Kamiike W, Matsuda H. Concomitant coronary bypass grafting and curative surgery for cancer. Surg Today 1995; 25:131-5. [PMID: 7772915 DOI: 10.1007/bf00311084] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The surgical management of patients with concomitant critical coronary artery disease (CAD) and surgically resectable cancer is controversial. We evaluated 19 patients who underwent concomitant coronary artery bypass grafting (CABG) and curative operation for cancer of the stomach in 9 patients, the colon in 4, the lung in 4, and the breast in 2. Each cancer operation was performed under stable hemodynamics without any serious bleeding tendency, immediately after CABG with an average of 2.5 +/- 0.8 grafts. There were no operative deaths and no incidences of perioperative myocardial infarction. Postoperative complications developed in three of the patients with lung cancer: respiratory dysfunction caused by phrenic nerve paralysis in two and mediastinitis in one. During the mean follow-up period of 33 +/- 23 months, 5 patients died of recurrent cancer or non-cardiac disease; however, all 19 patients remained free from any postoperative cardiac events and their quality of life apparently improved. This experience suggests that such simultaneous correction would be safe and beneficial in carefully selected patients who have surgically correctable CAD and potentially curable cancer.
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3109
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Takahashi T, Terachi T, Sohma T, Terai A, Takeuchi H, Yoshida O. [Four cases of urinary lithiasis associated with chronic inflammatory bowel disease]. HINYOKIKA KIYO. ACTA UROLOGICA JAPONICA 1995; 41:127-31. [PMID: 7702004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
We report 4 cases of urinary lithiasis associated with chronic inflammatory bowel disease. All cases were surgically treated and the mode of operation was total colectomy in two cases, ileal resection (1 m) in 1 case and total colectomy and ileal resection (1 m) in 1 case. The composition of the stone was uric acid in 2 cases treated with total colectomy and calcium oxalate in the other 2 cases treated with ileal resection. Low urine volume was observed in 3 cases and acid urine in all cases. Hypocitruria was observed in 3 cases. Two cases with ileal resection showed enteric hyperoxaruia and increased urinary excretion of oxalate was observed on the oxalate loading test.
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3110
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Matsumoto F, Takahashi T, Morita M. [Fluoroquinolone]. NIHON RINSHO. JAPANESE JOURNAL OF CLINICAL MEDICINE 1995; 53 Su Pt 1:1010-6. [PMID: 8753611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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3111
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Kodama H, Yoshida I, Ohtani Y, Ishikawa S, Ohtaki A, Takahashi T, Satoh Y, Kawashima O, Morishita Y. [Myasthenia gravis: an analysis of patients with postoperative crisis after thymectomy]. KYOBU GEKA. THE JAPANESE JOURNAL OF THORACIC SURGERY 1995; 48:110-2. [PMID: 7897877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Five patients with myasthenia gravis whose condition declined during the postoperative unstable period were studied. The Osserman's type, age at the time of onset, duration of illness, sex, age at the time of surgery, preoperative steroid therapy, thymoma and acetyl choline receptor antibody titers were compared with those of 21 patients (control) with myasthenia gravis who had an uneventful postoperative course. In comparison, the study group's Osserman's type was slight, age at the time of onset was older (p < 0.05) and duration of illness was shorter (p < 0.05). There was no significant difference between the groups in sex, age at the time of surgery, thymoma and acetyl choline receptor antibody titers. None of them had preoperative steroid therapy. Intensive postoperative management and careful follow-up at the postoperative unstable period are necessary particularly for patients who have slight Osserman's type, old age at the time of onset, short duration of illness and no preoperative steroid therapy.
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3112
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Honma K, Honma S, Nakamura K, Sasaki M, Endo T, Takahashi T. Differential effects of bright light and social cues on reentrainment of human circadian rhythms. THE AMERICAN JOURNAL OF PHYSIOLOGY 1995; 268:R528-35. [PMID: 7864251 DOI: 10.1152/ajpregu.1995.268.2.r528] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Reentrainment of human circadian rhythm to an 8-h advanced schedule of sleep and social contacts was assessed under two different conditions: with and without bright light (4,000-6,000 lx). Subjects spent 15 days without knowing the natural day-night alternation. On the fourth day, the social schedule was phase-advanced by 8 h. In one experiment, a bright light pulse of 3-h duration was given in every subjective morning, and in the other no light pulse was applied. Plasma melatonin and rectal temperature rhythms were measured. Seven of nine subjects showed an orthodromic phase shift, the rate of which was significantly larger with bright light pulses than without them. The maximum phase-advance shift by three consecutive light pulses was observed when the first pulse was applied approximately 4 h after the onset of melatonin rise. By contrast, the maximum phase shift of a similar extent was detected at 1 h after the onset of melatonin rise, when ordinary room light (300-500 lx) at the time corresponding to bright light was regarded as a dim light pulse. It is concluded that bright light accelerates the reentrainment of human circadian rhythm, and bright light and social schedule have differential effects on the reentrainment.
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3113
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Yokoya T, Takahashi T, Mochiku T, Kadowaki K. Anisotropy of the electronic structure and superconducting gap in Bi2Sr2CaCu2O8. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:3945-3948. [PMID: 9979222 DOI: 10.1103/physrevb.51.3945] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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3114
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Ayabe H, Tagawa Y, Tsuji H, Kawahara K, Akamine S, Takahashi T, Hara S, Tomita M. Results of carinal resection for bronchogenic carcinoma. TOHOKU J EXP MED 1995; 175:91-9. [PMID: 7597697 DOI: 10.1620/tjem.175.91] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Fifteen patients underwent carinal resection for lung cancer during the years of 1957 through 1993. All were males with ages ranging from 40 to 81 (mean 60.1) years old. Cell Types of the cancer were squamous cell carcinoma in 12 cases, adenocarcinoma in 2 and small cell carcinoma in one. In 14 of 15 cases there was cancerous invasion into the tracheal carina (T4) and one had no involvement of the carina (T3). Four patients had no lymph node metastasis (N0), 2 had hilar node metastasis (N1), 8 had ipsilateral mediastinal node metastasis (N2) and one had contralateral mediastinal node metastasis (N3). Operative procedures for carino-plasty were sleeve pneumonectomy in 3 cases, pneumonectomy with wedge resection of the carina in 3, sleeve resection of the carina followed by reconstruction of the carina (Montage type) in 8, and carinal resection with reconstruction of the one-stoma type in one. Two patients died within one month due to pneumonia or renal failure (13.3%). Postoperative complications occurred in 14 cases and bronchorrhea (n = 8), anastomotic stenosis (n = 5) and pneumonia (n = 4) were frequent. Excluding 2 operative deaths, 8 cases died from 2 to 37 months after operation (mean 13.1 months) and 5 are alive from 10 to 24 months without recurrences. Patients with squamous cell carcinoma with N0 or N1 had better prognosis.
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3115
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Kawashima R, Itoh H, Ono S, Satoh K, Furumoto S, Gotoh R, Koyama M, Yoshioka S, Takahashi T, Yanagisawa T. Activity in the human primary motor cortex related to arm and finger movements. Neuroreport 1995; 6:238-40. [PMID: 7756600 DOI: 10.1097/00001756-199501000-00003] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
With the purpose of mapping representations of the finger and proximal arm in the human primary motor cortex (MI), we measured regional cerebral blood flow (rCBF) in eight right-handed normal volunteers during self-paced finger and proximal arm movements. Each movement activated two different fields in MI, one located deep in the anterior lip of the central sulcus and the other relatively close to the surface of the precentral gyrus. Arm fields were located higher than finger fields. A superficial arm field and a deep finger field partially, overlapped. The results indicate that there are two spatially separate motor representations of the finger and proximal arm in the human MI.
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3116
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Takahashi T, Nakagoshi H, Sarai A, Nomura N, Yamamoto T, Ishii S. Human A-myb gene encodes a transcriptional activator containing the negative regulatory domains. FEBS Lett 1995; 358:89-96. [PMID: 7821437 DOI: 10.1016/0014-5793(94)01402-m] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The myb gene family has three members, c-myb, A-myb, and B-myb. A-myb mRNA is mainly expressed in testis and peripheral blood leukocytes. A-Myb can activate transcription from the promoter containing Myb-binding sites in all cells examined. In addition to the two domains (a DNA-binding domain and a transcriptional activation domain), two negative regulatory domains have been identified in A-Myb. These results indicate that A-Myb functions as a transcriptional activator mainly in testis and peripheral blood cells, and the regulatory mechanism of A-Myb activity is similar to that of c-Myb.
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3117
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Kamada S, Shimono A, Shinto Y, Tsujimura T, Takahashi T, Noda T, Kitamura Y, Kondoh H, Tsujimoto Y. bcl-2 deficiency in mice leads to pleiotropic abnormalities: accelerated lymphoid cell death in thymus and spleen, polycystic kidney, hair hypopigmentation, and distorted small intestine. Cancer Res 1995; 55:354-9. [PMID: 7812968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Transgenic mice homozygously lacking in the bcl-2 gene were generated using homologous recombination in embryonal stem cells. The complete absence of Bcl-2 alpha and -beta proteins did not interfere with normal embryonic development. Abnormalities became evident after birth, although the severity varied among homozygous null mice, bcl-2-/- mice displayed pleiotropic abnormalities similar to those in the previously described bcl-2-/- mice, including growth retardation, smaller ears, short lives, polycystic kidney, atrophic thymus and spleen with accelerated apoptotic cell death of lymphocytes, and hair hypopigmentation in the second hair follicle cycle. Our bcl-2-/- mice also revealed novel defects in the small intestine, characterized by retarded development, accelerated exfoliation of epithelial cells, and very few mitotic progenitor cells.
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3118
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Takahashi T, Chapman PB, Yang SY, Hara I, Vijayasaradhi S, Houghton AN. Reactivity of autologous CD4+ T lymphocytes against human melanoma. Evidence for a shared melanoma antigen presented by HLA-DR15. THE JOURNAL OF IMMUNOLOGY 1995. [DOI: 10.4049/jimmunol.154.2.772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
Reactivity of CD8+ T lymphocytes against human melanoma has been extensively characterized, but little is known about melanoma Ags recognized by CD4+ lymphocytes. We have identified CD4+ CTL that recognize shared melanoma Ag(s) expressed by autologous melanoma cells and a subset of allogeneic melanomas. The same Ag(s) was shared by autologous and positive allogeneic melanomas by cross-blocking experiments. Cytotoxicity was directed against epitopes presented by HLA-DR on target melanoma cells, and allelic typing revealed that cytotoxicity was restricted through HLA-DR15. These CD4+ T cells released IFN-gamma, IL-4, and TNF-alpha, but not IL-2, in response to HLA-DR15+ target cells. CD4+ T cells did not lyse DR15+ nonmelanoma cell types, including melanocytes or fibroblasts (induced to express HLA-DR by IFN-gamma). Thus, by cytotoxicity assays, shared Ags were only recognized on melanoma cells but not on normal melanocytes. In summary, this analysis shows that melanoma cells share an Ag that is presented by HLA-DR15.
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3119
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Takahashi T, Chapman PB, Yang SY, Hara I, Vijayasaradhi S, Houghton AN. Reactivity of autologous CD4+ T lymphocytes against human melanoma. Evidence for a shared melanoma antigen presented by HLA-DR15. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1995; 154:772-9. [PMID: 7814883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Reactivity of CD8+ T lymphocytes against human melanoma has been extensively characterized, but little is known about melanoma Ags recognized by CD4+ lymphocytes. We have identified CD4+ CTL that recognize shared melanoma Ag(s) expressed by autologous melanoma cells and a subset of allogeneic melanomas. The same Ag(s) was shared by autologous and positive allogeneic melanomas by cross-blocking experiments. Cytotoxicity was directed against epitopes presented by HLA-DR on target melanoma cells, and allelic typing revealed that cytotoxicity was restricted through HLA-DR15. These CD4+ T cells released IFN-gamma, IL-4, and TNF-alpha, but not IL-2, in response to HLA-DR15+ target cells. CD4+ T cells did not lyse DR15+ nonmelanoma cell types, including melanocytes or fibroblasts (induced to express HLA-DR by IFN-gamma). Thus, by cytotoxicity assays, shared Ags were only recognized on melanoma cells but not on normal melanocytes. In summary, this analysis shows that melanoma cells share an Ag that is presented by HLA-DR15.
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3120
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Hasegawa T, Hashimoto O, Homma S, Miyachi T, Nagae T, Sekimoto M, Shibata T, Sakaguchi H, Takahashi T, Aoki K, Noumi H, Bhang H, Youn M, Gavrilov Y, Ajimura S, Kishimoto T, Ohkusu A, Maeda K, Sawafta R, Redwine RP. Core-excited states of Lambda 12C hypernuclei formed in the ( pi +,K+) reaction. PHYSICAL REVIEW LETTERS 1995; 74:224-227. [PMID: 10058334 DOI: 10.1103/physrevlett.74.224] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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3121
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Watabe H, Hatazawa J, Ishiwata K, Ido T, Itoh M, Iwata R, Takahashi T, Hatano K, Nakamura T. Linearized method: A new approach for kinetic analysis of central dopamine D(2) receptor specific binding. IEEE TRANSACTIONS ON MEDICAL IMAGING 1995; 14:688-696. [PMID: 18215873 DOI: 10.1109/42.476110] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We proposed a new method (;linearized method') to analyze neuroleptic ligand-receptor specific binding in a human brain using positron emission tomography (PET). We derived the linear equation to solve four rate constants, k(3), k(4), k(5), k(6) from PET data. This method does not demand a radioactivity curve in plasma as an input function to the brain, and can perform fast calculations in order to determine rate constants. We also tested the nonlinearized method including nonlinear equations which is a conventional analysis using plasma radioactivity corrected for ligand metabolites as an input function. We applied these methods to evaluate dopamine D(2) receptor specific binding of [(11)C] YM-09151-2. The value of B(max)/K(d)=k(3)/k (4) obtained by the linearized method was 5.72+/-3.1 which was consistent with the value of 5.78+/-3.4 obtained by the nonlinearized method.
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3122
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Tsuyuoka R, Takahashi T, Suzuki A, Sasaki Y, Nakamura K, Fukumoto M, Ohmori K, Ohno Y, Nakao K. A newly established megakaryoblastic/erythroid cell line that differentiates to red cells in the presence of erythropoietin and produces platelet-like particles. Stem Cells 1995; 13:54-64. [PMID: 7719248 DOI: 10.1002/stem.5530130108] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
In August, 1992, we established a leukemic cell line (NS-Meg) from a patient in megakaryoblastic transformation of Philadelphia chromosome-positive chronic myeloid leukemia. The NS-Meg cells were positive for alpha-naphthyl acetate esterase and periodic acid-Schiff (PAS) staining and for surface CD4, CD7, CD13, CD34, CD41a, and glycophorin A antigens. Ultrastructurally, the cells had alpha-granules, demarcation membranes, and platelet peroxidase activity. The NS-Meg cells spontaneously produced platelet-like particles which contained alpha-granules, mitochondria and dense bodies, strongly suggesting platelet production. Erythropoietin (Epo), granulocyte/macrophage colony stimulating factor(GM-CSF), and interleukin 3 (IL-3) promoted the growth of NS-Meg cells. Phorbol-12-myristate-13-acetate increased the expression of both CD41a and CD61 antigens. Ten-day exposure to Epo induced mature erythroblasts and red cells. These benzidine-positive cells were positive for hemoglobin F staining. Untreated NS-Meg cells expressed mRNA for the Epo receptor (EpoR), for GATA-1, and for alpha 1, alpha 2 and gamma globin genes. These results indicate that NS-Meg cells undergo terminal differentiation of both megakaryocytic and erythroid lineages. This cell line should be a very useful tool for the investigation of both megakaryocytic and erythroid maturation.
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3123
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Lee JS, Takahashi T, Hagiwara A, Yoneyama C, Itoh M, Sasabe T, Muranishi S, Tashima S. Safety and efficacy of intraperitoneal injection of etoposide in oil suspension in mice with peritoneal carcinomatosis. Cancer Chemother Pharmacol 1995; 36:211-6. [PMID: 7781140 DOI: 10.1007/bf00685848] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We compared the safety and efficacy in mice with peritoneal carcinomatosis of two etoposide formulations: an aqueous solution (Etp-sol) and particles suspended in oil (the addition products of iodine and the ethyl esters of the fatty acids obtained from poppy-seed oil (Lipiodol) or sesame oil; Etp-oil). We also investigated tissue distribution of etoposide in rats treated with Etp-oil and Etp-sol. Etoposide was injected intraperitoneally at concentrations ranging from 52 to 392 mg/kg (increasing geometrically by a factor of 1.4). The 50% lethal dose (LD50), determined over a 2-week period of observation, was 135 mg/kg for Etp-oil and 108 mg/kg for Etp-sol. Autopsy findings included macroscopic intestinal bleeding, necrosis of the intestinal mucosa, and pulmonary congestion in mice from both treatment groups. In the efficacy trials. 10(6) P388 leukemia cells were transplanted into CDF1 male mice, and Etp-oil and Etp-sol were injected at doses of 20 mg/kg and 80 mg/kg. In the groups receiving the 20 mg/kg dose, 11 of 19 mice in the Etp-oil group survived to day 60 compared with 3 of 20 mice in the Etp-sol group. Toxicity-related deaths occurred in 1 of 20 mice treated with 80 mg/kg Etp-oil and in 8 of 20 mice treated with 80 mg/kg Etp-sol. No cancer-related deaths were associated with the 80 mg/kg dose in either treatment group. Our findings showed that the Etp-oil was associated with a lower toxicity and a higher efficacy than the Etp-sol. To evaluate tissue distribution, rats were injected intraperitoneally with 5 mg/kg body weight of Etp-sol or Etp-oil. The tissue distribution of etoposide was subsequently analyzed by high performance liquid chromatography. Compared with Etp-sol, Etp-oil delivered significantly greater amounts of etoposide and for a longer period to the omentum, taken as representative of the intraperitoneal tissue, and the etoposide concentration in blood plasma was increased more slowly and decreased more gradually.
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3124
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Tezuka F, Chiba R, Takahashi T. Quantitative cytopathology of endometrial lesions. JOURNAL OF CELLULAR BIOCHEMISTRY. SUPPLEMENT 1995; 23:147-50. [PMID: 8747389 DOI: 10.1002/jcb.240590919] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Morphometric and multivariate statistical methods were used to discriminate endometrial carcinoma from benign cells in cytologic studies. Clumps of epithelial cells that appeared most diagnostically relevant were selected from aspirated samples of 70 endometrial cancer patients. The cells' cytologic character was reduced to a combination of five quantitative parameters--nuclear size, degree of anisokaryosis, nuclear from index, homogeneity of nuclear chromatin texture, and regularity of nuclear arrangement. The 5-variate cluster analysis demonstrated that the 70 cases could be classified into three definite groups: Group A (17 cases) was characterized by cells of small nuclear size, slight anisokaryosis, homogeneous chromatin texture, and regular nuclear arrangement; Group C (12 cases) by cells of large nuclear size, marked anisokaryosis, heterogeneous chromatin texture, and irregular nuclear arrangement; and Group B (41 cases) by cells of intermediate parameter values. Group C was derived from 10 cases of adenocarcinoma and 2 of atypical hyperplasia, while Groups A and B were not derived from any cases of malignancy. The computer-assisted morphometric statistical method can objectively classify the endometrial cells into malignant and benign, with improved validity and reproducibility. The cytopathologic finding, if detected by this method, may serve as a surrogate endpoint biomarker.
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3125
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Athauda SB, Arakawa H, Takahashi T, Nishigai M, Ido E, Kyushiki H, Yoshinaka Y, Ikai A, Tang J, Ukai M. Inhibition and entrapment of aspartic proteinases by alpha 2-macroglobulin. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1995; 362:305-13. [PMID: 8540333 DOI: 10.1007/978-1-4615-1871-6_37] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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