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Yokoyama I, Momomura S, Ohtake T, Yonekura K, Nishikawa J, Sasaki Y, Omata M. Reduced myocardial flow reserve in non-insulin-dependent diabetes mellitus. J Am Coll Cardiol 1997; 30:1472-7. [PMID: 9362404 DOI: 10.1016/s0735-1097(97)00327-6] [Citation(s) in RCA: 171] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVES We analyzed myocardial flow reserve (MFR) in patients with non-insulin-dependent (type II) diabetes mellitus (NIDDM) without symptoms and signs of ischemia. BACKGROUND Diminished MFR in diabetes has been suggested. However, it remains controversial whether MFR is related to glycemic control, mode of therapy or gender in NIDDM. METHODS Myocardial blood flow (MBF) was measured at baseline and during dipyridamole loading in 25 asymptomatic, normotensive, normocholesterolemic patients with NIDDM and 12 age-matched control subjects by means of positron emission tomography and nitrogen-13 ammonia, after which MFR was calculated. RESULTS Baseline MBF in patients with NIDDM ([mean +/- SD] 74.0 +/- 24.0 ml/min per 100 g body weight) was comparable to that in control subjects (73.0 +/- 17.0 ml/min per 100 g). However, MBF during dipyridamole loading was significantly lower in patients with NIDDM (184 +/- 99.0 ml/min per 100 g, p < 0.01) than in control subjects (262 +/- 120 ml/min per 100 g), as was MFR (NIDDM: 2.77 +/- 0.85; control subjects: 3.8 +/- 1.0, p < 0.01). A significantly decreased MFR was seen in men (2.35 +/- 0.84) compared with women with NIDDM (3.18 +/- 0.79, p < 0.05); however, no significant differences were found in terms of age, hemoglobin a1c and baseline MBF. MFR was comparable between the diet (2.78 +/- 0.80) and medication therapy groups (2.76 +/- 0.77) and was inversely correlated with average hemoglobin A1c for 5 years (r = -0.55, p < 0.01) and fasting plasma glucose concentration (r = -0.57, p < 0.01) but not age or lipid fractions. CONCLUSIONS Glycemic control and gender, rather than mode of therapy, is related to MFR in NIDDM.
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Asano H, Kobayashi T, Uchida K, Hayashi S, Yokoyama I, Inoko H, Takagi H. Significance of tumor necrosis factor microsatellite polymorphism in renal transplantation. TISSUE ANTIGENS 1997; 50:484-8. [PMID: 9389322 DOI: 10.1111/j.1399-0039.1997.tb02903.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Plasma levels of tumor necrosis factor (TNF) alpha are raised during acute rejection following organ transplantation. Variations in TNF alpha production have been found to be associated with the polymorphism of TNF microsatellite. Therefore, there is a possibility that a transplant recipient with some type of TNF microsatellite can be a high-risk patient of graft rejection. The purpose of this study was to examine whether TNF microsatellite polymorphism is related to acute allograft rejection. We investigated the relation of two microsatellites, TNFa and TNFd, to acute rejection after renal transplantation. Among 189 primary living-related renal transplantations from one haplotype-mismatched and one DRB1-mismatched donor, we analyzed TNF microsatellites of 163 patients whose DNA were available to this study. The frequency of the TNFa9 microsatellite allele was significantly higher in the rejection group compared to the rejection-free group. In contrast, the frequency of TNFd4 was significantly lower in the rejection group compared to the rejection-free group. TNFa9 and TNFd4 showed strong associations with HLA-B35 and B44, respectively. However, the TNF microsatellite locus was more closely related to acute rejection than HLA-B. It was suggested that the analysis of TNF microsatellite polymorphism can provide useful information in predicting prognosis after transplantation.
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Hayashi S, Emi N, Yokoyama I, Namii Y, Uchida K, Takagi H. Inhibition of establishment of hepatic metastasis in mice by combination gene therapy using both herpes simplex virus-thymidine kinase and granulocyte macrophage-colony stimulating factor genes in murine colon cancer. Cancer Gene Ther 1997; 4:339-44. [PMID: 9408603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Herpes simplex virus-thymidine kinase (HS-tk) gene therapy with ganciclovir (GCV) treatment has been reported to inhibit the tumor growth, which is applied to the gene therapy targeted to the malignant brain tumor. To suppress the tumor growth completely, the authors designed the HS-tk gene therapy in combination with granulocyte macrophage-colony stimulating factor (GMCSF) gene using the hepatic metastatic model of murine colon cancer. The transduction of the HS-tk gene in combination with the GMCSF gene, followed by GCV, showed a complete inhibition of hepatic metastases of murine colon cancer, which was significantly superior to that of HS-tk gene alone. The growth of cancer cells transduced with both HS-tk and GMCSF genes was inhibited in vitro, and long-lasting antitumor immunity after hepatic metastasis of cancer cells transduced with both HS-tk and GMCSF genes was acquired. It is suggested that HS-tk gene therapy in combination with the GMCSF gene is effective for the complete inhibition of hepatic metastasis of murine colon cancer.
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Kurihara T, Maeda A, Shigemoto M, Yamashita K, Yokoyama I, Nakano T, Kawakami A, Takagi Y, Kikuchi Y. 4.P.237 Effect of remnant-like lipoprotein particles (RLP) on blood rheology using a micro-channel technique: Studies in patients with fatty liver. Atherosclerosis 1997. [DOI: 10.1016/s0021-9150(97)89763-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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105
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Aoyagi T, Sugiura S, Eto Y, Yonekura K, Matsumoto A, Yokoyama I, Kobayakawa N, Omata M, Kirimoto T, Hayashi Y, Momomura S. Inhibition of carnitine synthesis protects against left ventricular dysfunction in rats with myocardial ischemia. J Cardiovasc Pharmacol 1997; 30:468-74. [PMID: 9335406 DOI: 10.1097/00005344-199710000-00010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
During myocardial ischemia, inhibition of the carnitine-mediated transportation of fatty acid may be beneficial because it facilitates glucose utilization and prevents an accumulation of fatty acid metabolites. We orally administered 3-(2,2,2-trimethyl hydrazinium) propionate (MET), an inhibitor of carnitine synthesis, for 20 days to rats. Then we evaluated left ventricular (LV) function during brief ischemia by using a buffer-perfused isovolumic heart model. After 15 min of reoxygenation after the transient ischemia, LV peak systolic pressure (PSP) almost completely returned to the baseline level in rats given MET (96 +/- 4%), whereas it was only partially (77 +/- 16%) recovered in the placebo-treated rats. We induced myocardial infarction in other rats by ligating the left anterior descending coronary artery. Then the animals were given MET for 20 days, and LV function was compared. In the placebo-treated rats (with myocardial infarction, but without drug treatment), LVPSP was lower than that in the sham group [108 +/- 19 (n = 10) vs. 136 +/- 15 mm Hg (n = 13); p < 0.05], and the time constant (T) of LV pressure decay was elongated (36 +/- 4 vs. 30 +/- 7 ms; p < 0.05). In MET-treated groups, however, neither PSP nor T differed from those in the sham group. In conclusion, inhibition of the carnitine-mediated transportation of fatty acid by MET protected against left ventricular dysfunction in acute and chronic myocardial ischemia.
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Hayashi S, Namii Y, Kozima T, Kobayashi T, Yokoyama I, Saito I, Hamada H, Ohtsuka S, Uchida K, Takagi H. Effect of CTLA4-Ig gene transfer using adenoviral vector in organ and cell transplantation. Transplant Proc 1997; 29:2212. [PMID: 9193596 DOI: 10.1016/s0041-1345(97)00302-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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107
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Hayashi S, Nagasaka T, Katayama A, Saito I, Hamada H, Kobayashi T, Yokoyama I, Ohtsuka S, Uchida K, Takagi H. Adenovirus-mediated gene transfer of antisense ribozyme for alpha (1,3)galactosyltransferase gene and alpha (1,2)fucosyltransferase gene in xenotransplantation. Transplant Proc 1997; 29:2213. [PMID: 9193597 DOI: 10.1016/s0041-1345(97)00303-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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108
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Yokoyama I, Mizuki Y, Yamaguchi T, Fujii T. Simultaneous enantiomeric determination of a gastroprokinetic agent mosapride citrate and its metabolite in plasma using alpha 1-acid glycoprotein HPLC column. J Pharm Biomed Anal 1997; 15:1527-35. [PMID: 9226586 DOI: 10.1016/s0731-7085(96)02006-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Mosapride citrate, a novel benzamide-type gastroprokinetic agent, is clinically prescribed as a racemate and is metabolized to its des-4-fluorobenzyl structure (M-1). In order to analyze simultaneously the enantiomers of mosapride and M-1 in plasma, a simple and reproducible high-performance liquid chromatographic (HPLC) method has been developed. The enantiomeric separation and determination were successfully achieved using an alpha 1-acid glycoprotein column and gradient elution with a fluorimetric detection (excitation 314 nm/emission 352 nm). Both enantiomers of mosapride and M-1 were well separated between 20 and 22 min at pH 4.4 and between 4 and 7 min at pH 5.0, respectively. Accurate determinations are possible in the concentration ranges of 10-5000 ng ml-1 for mosapride enantiomers and 50-5000 ng ml-1 for M-1 enantiomers. The intra- and inter-day coefficients of variation are satisfactory for the pharmacokinetic study of mosapride.
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Katayama A, Ogawa H, Kadomatsu K, Muramatsu H, Muramatsu T, Hayashi S, Yokoyama I, Takagi H. Studies of alpha-Gal dependent hyperacute xenotransplant rejection using double knockout embryonic stem cells. Transplant Proc 1997; 29:2262. [PMID: 9193617 DOI: 10.1016/s0041-1345(97)00323-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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110
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Hayashi S, Koike C, Namii Y, Nagasaka T, Katayama A, Saito I, Okada H, Yokoyama I, Ohtsuka S, Uchida K, Takagi H. Adenovirus-mediated gene transfer to the xenogeneic liver in liver xenotransplantation: the transduction of complement regulatory factor genes (DAF and HRF20). Transplant Proc 1997; 29:2211. [PMID: 9193595 DOI: 10.1016/s0041-1345(97)00301-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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111
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Namii Y, Hayashi S, Yokoyama I, Kobayashi T, Yasutomi M, Nagasaka T, Uchida K, Hamada H, Takagi H. Evidence that the adenoviral vector containing the CTLA4-Ig gene improves transgene expression and graft survival. Transplant Proc 1997; 29:1738-9. [PMID: 9142255 DOI: 10.1016/s0041-1345(97)00038-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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112
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Kurihara T, Tsuchiya M, Akimoto M, Hashimoto H, Ishiguro H, Niimi A, Maeda A, Shigemoto M, Yamashita K, Yokoyama I, Kikuchi Y. [Blood rheological study in rats with fatty liver--with special reference to effects of ethyl icosapentate]. NIHON SHOKAKIBYO GAKKAI ZASSHI = THE JAPANESE JOURNAL OF GASTRO-ENTEROLOGY 1997; 94:328-35. [PMID: 9170880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A blood rheological study was conducted using Kikuchi's micro-channel method in rats with fatty liver. Effects of eicosapentaenoic acid (EPA) on blood rheology were also evaluated. Male SD rats given normal feed served as the control. One group was given choline-deficient feed for 4 weeks (EPA (-) group), while another group was daily given EPA (1000 mg/kg) for 4 weeks together with choline-deficient feed (EPA (+) group). The micro-channel passage time was determined using 100 microliters of whole blood. The passage time significantly increased in the EPA (-) group compared to the control (p < 0.01). It significantly decreased in the EPA (+) group compared to the EPA (-) group (p < 0.01). Findings obtained in the present study suggested that blood rheological factors are related to the development of fatty liver and that EPA inhibits fatty changes of the liver by improving these rheological factors.
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Nagasaka T, Kobayashi T, Muramatsu H, Fujimoto H, Matsuo I, Ajisaka K, Kadomatsu K, Hayashi S, Yokoyama I, Hayakawa A, Muramatsu T, Takagi H. alpha-Galactosyl oligosaccharides conjugated with polyethylene glycol as potential inhibitors of hyperacute rejection upon xenotransplantation. Biochem Biophys Res Commun 1997; 232:731-6. [PMID: 9126345 DOI: 10.1006/bbrc.1997.6360] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Antibodies to an alpha-galactosyl saccharide structure are mainly responsible for hyperacute rejection after pig-to-primate xenotransplantation. The beneficial effect of alpha-galactosyl oligosaccharides has been shown on the inhibition of anti-pig natural antibodies. We synthesized polyethylene glycol (PEG)-conjugates of alpha-galactosyl disaccharide (Di) and trisaccharide (Tri) as potential inhibitors of the rejection reaction. The half lives of Di, Tri, PEG-conjugated Di (Di-PEG) and PEG-conjugated Tri (Tri-PEG) were 18.1 +/- 2.3 min, 20.2 +/- 0.9 min, 38.7 +/- 2.8 min and 35.8 +/- 1.6 min, respectively. Furthermore, Di-PEG and Tri-PEG showed biphasic clearance, and their half lives at the second phase were longer than 10 hours. PEG-conjugated oligosaccharides (Di-PEG, Tri-PEG) markedly inhibited cytotoxic action of human sera to pig kidney cell line (PK15) compared to unconjugated oligosaccharides (Di, Tri). The binding of IgM antibodies to PK15 cells, however, was more strongly blocked by unconjugated oligosaccharides than PEG-conjugated oligosaccharides. This phenomenon can be explained by the finding that PEG has anti-complement activity and masks antigenic sites of oligosaccharides. In conclusion, conjugation of PEG to oligosaccharides provided two beneficial effects; prolonged intravascular retention time and anti-complement activity, upon systemic application of the oligosaccharides. The present findings opened a new approach to treatment of hyperacute rejection after xenotransplantation.
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Yasutomi M, Hayashi S, Ito M, Ohtsuka S, Namii Y, Uchida K, Yokoyama I, Takagi H. Evaluation of tetrahydropyranyladriamycin as an immunosuppressant in concordant xenotransplantation. J Heart Lung Transplant 1997; 16:283-9. [PMID: 9087871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND Tetrahydropyranyladriamycin (THP), a derivative of anthracycline, exhibits a stronger antiproliferative activity and a lower cardiotoxicity than the other anthracyclines. The value of THP as an immunosuppressant has not been examined yet, whereas cyclophosphamide, which is another antiproliferative drug, has shown promise as an immunosuppressant in concordant xenotransplantation. METHODS The effect of THP on the marginal zone in the spleen and anti-species antibody production was evaluated and was compared with that of cyclophosphamide in a concordant xenogeneic splenocyte injection model (hamster-to-rat). Next, THP was used as monotherapy for hamster-to-rat heart transplantation to substantiate the potency of its immunosuppressive activity in concordant xenotransplantation. Finally, combination therapy with THP plus FK506 was tried. RESULTS THP (5 mg/kg) suppressed the expansion of the marginal zone more than did cyclophosphamide (40 mg/kg) and inhibited the production of antispecies antibody as much as did cyclophosphamide (40 mg/kg) in the splenocyte injection model. THP monotherapy could prolong the survival of hamster-to-rat heart grafts up to 14.5 +/- 3.2 days (n = 21). The rejected grafts in the THP-treated animals did not show any histologic evidence of vascular endothelial damage but did exhibit a mononuclear cell infiltration. Combination therapy with THP plus FK506 provided excellent graft survival. CONCLUSIONS THP can prevent early phase humoral rejection in concordant xenotransplantation.
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Hayashi S, Nagasaka T, Koike C, Kobayashi T, Hamada H, Yokoyama I, Saito I, Takagi H. Effect of antisense ribozyme to alpha (1,3)galactosyl transferase gene on the expression of Gal alpha (1,3)Gal epitope. Transplant Proc 1997; 29:893. [PMID: 9123574 DOI: 10.1016/s0041-1345(96)00208-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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116
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Yokoyama I, Negita M, Hayakawa A, Takebe A, Hayashi S, Kobayashi T, Katayama A, Namii Y, Nagasaka T, Koike C, Kojima T, Takagi H. Apoptosis in pig endothelial cells after reperfusion and its prevention by genetic induction of human Cu, Zn-SOD cDNA. Transplant Proc 1997; 29:1364. [PMID: 9123341 DOI: 10.1016/s0041-1345(96)00597-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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117
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Koike C, Katayama A, Kadomatsu K, Hiraiwa N, Hayashi S, Kobayashi T, Hayash S, Yokoyama I, Takagi H. Reduction of alpha-Gal epitopes in transgenic pig by introduction of human alpha 1-2 fucosyltransferase. Transplant Proc 1997; 29:894. [PMID: 9123575 DOI: 10.1016/s0041-1345(96)00211-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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118
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Takeda A, Morozumi K, Koyama K, Yoshida A, Uchida K, Tominaga Y, Haba T, Oikawa T, Usami T, Sugito K, Takeuchi O, Fujinami T, Yokoyama I, Takagi H. Severe cyclosporine arteriolopathy with focal segmental glomerulosclerosis is not a fatal finding in chronic renal allograft failure after year 5 of transplantation using cyclosporine. Transplant Proc 1997; 29:96-9. [PMID: 9123169 DOI: 10.1016/s0041-1345(96)00020-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Negita M, Hayashi S, Koike C, Emi N, Yokoyama I, Uchida K, Takagi H. Protective effect of human superoxide dismutase cDNA transfection in the prevention of cold preservation injury. Transplant Proc 1997; 29:1363. [PMID: 9123340 DOI: 10.1016/s0041-1345(96)00596-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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120
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Morozumi K, Oikawa T, Fukuda M, Sugito K, Takeuchi O, Usami T, Fujinami T, Yokoyama I, Takagi H, Takeda A, Koyama K, Yoshida A, Haba T, Tominaga Y, Uchida K. Electron-microscopic peritubular capillary lesion is a specific and useful diagnostic indicator for chronic rejection of renal allografts showing less specific morphologic lesions in the cyclosporine era. Transplant Proc 1997; 29:89-92. [PMID: 9123167 DOI: 10.1016/s0041-1345(96)00018-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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121
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Kimata S, Hosoda S, Yokoyama I, Yamada N. An index predicting coronary heart disease: LDL/HDL x 5. JAPANESE HEART JOURNAL 1997; 38:1-9. [PMID: 9186277 DOI: 10.1536/ihj.38.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Atherosclerotic changes in the coronary artery are exacerbated by the balance between LDL, which carries cholesterol into the arterial wall, and HDL, which carries it out from the wall. The molecular weight of LDL is about 2 x 10(6) and that of HDL is about 4 x 10(5), which is almost 1/5 of the molecular weight of LDL. For this reason, LDL/HDL x 5 should be a good indicator of coronary heart disease. We evaluated this index in two subject groups. At first, we determined whether it could predict the incidence of effort angina in participants of a medical examination system. Most of the subjects were healthy and good candidates for primary prevention. LDL/HDL x 5 was a more sensitive index predicting effort angina than total cholesterol, LDL or HDL. The concentrations of HDL were significantly lower in myocardial infarction patients at all ages in both sexes. The average serum concentration of HDL was 56.6 +/- 15.0 mg/dl in the medical examination group and 38.9 +/- 12.2 mg/dl in the AMI group. We tested whether our new index, LDL/HDL x 5, could predict the incidence of re-infarction in patients with myocardial infarction who were candidates for secondary prevention. LDL/HDL x 5 was a more sensitive index predicting re-infarction than total cholesterol, LDL or HDL.
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Hayashi S, Emi N, Yokoyama I, Uchida K, Takagi H. Effect of gene therapy with the herpes simplex virus-thymidine kinase gene on hepatic metastasis in murine colon cancer. Surg Today 1997; 27:40-3. [PMID: 9035298 DOI: 10.1007/bf01366937] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Hepatic metastasis of colon cancer is an important prognostic factor for survival. In this study, we examined the effect of gene therapy using the herpes simplex virus-thymidine kinase (HS-tk) gene with short-course ganciclovir (GCV) treatment for multiple hepatic metastases of murine colon cancer. Colon26 cells transfected with the HS-tk gene were found to be sensitive to GCV in a concentration-dependent way. On the other hand, induction of the HS-tk gene in the cells had no influence on cell growth in vitro. However, multiple hepatic metastases of Colon26 cells transfected with HS-tk gene were significantly suppressed by the GCV treatment. These results thus suggest that HS-tk gene therapy is useful for the treatment of hepatic metastasis in colon cancer.
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Yokoyama I, Tabuchi Y, Negita M, Kobayashi T, Yasutomi M, Hayashi S, Namii Y, Katayama A, Nagasaka T, Kojima T, Matsunaka T, Takagi H. Measurement of portal venous flow velocity with an implantable miniature Doppler probe in pig liver transplantation. Transpl Int 1997; 10:116-20. [PMID: 9089996 DOI: 10.1007/s001470050023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Portal venous flow (PVF) was serially monitored after pig liver transplantation (LTX) with the use of an implantable, miniature Doppler probe developed in our laboratory. Throughout the study period, the mean PVF in pigs that underwent LTX was significantly greater than that in pigs that were sham operated. For three animals with early graft failure secondary to primary nonfunction and for six that survived longer than 7 days, the mean PVF on postoperative day (POD) 1 was 18.7 +/- 3.8 cm/s and 41.7 +/- 11.2 cm/s, respectively (P < 0.05). For animals with acute cellular rejection (ACR), the mean PVF was 61.3 +/- 9.9 cm/s on POD 7 and 54.3 +/- 6.38 cm/s on POD 14. These values were significantly higher than those for animals without ACR (P < 0.05). Moreover, the increase in PVF correlated well with the degree of ACR. The actual PVF volume was measured by ex vivo perfusion, which showed a clear correlation with the PVF velocity obtained with the implanted, miniature Doppler probe. We feel that the liver graft requires increased PVF volume after transplantation to facilitate functional recovery from damage to hepatocytes due to preservation-reperfusion injury, and that ACR is also associated with an increased PVF. We conclude that monitoring the PVF in the early postoperative period after LTX is useful in the evaluation of graft function, particularly for predicting primary nonfunction and severity of ACR.
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Yokoyama I, Ohtake T, Momomura S, Nishikawa J, Sasaki Y, Omata M. Reduced coronary flow reserve in hypercholesterolemic patients without overt coronary stenosis. Circulation 1996; 94:3232-8. [PMID: 8989134 DOI: 10.1161/01.cir.94.12.3232] [Citation(s) in RCA: 140] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
BACKGROUND Reduced coronary flow reserve (CFR) in hypercholesterolemic patients without evidence of ischemia has been reported. However, it remains uncertain whether this abnormality occurs without overt coronary atherosclerosis. This study aimed to clarify whether CFR is impaired even in anatomically normal coronary arteries in hypercholesterolemic patients and to compare CFR between familial hypercholesterolemic (FH) patients and secondary hypercholesterolemic (SH) patients. METHODS AND RESULTS Twenty-two patients with hypercholesterolemia (11 FH, 11 SH) and 11 control subjects were studied. Baseline myocardial blood flow (MBF) and MBF during dipyridamole loading were measured in segments perfused by angiographically normal coronary arteries with the use of positron emission tomography and 13N-ammonia, and CFR was calculated. Baseline MBF (mL/min per 100 g heart wt) in FH (81.3 +/- 31.4) and SH (70.0 +/- 20.7) patients was not different from that in control subjects (75.0 +/- 34.9). However, MBF during dipyridamole loading was significantly lower in FH patients (129 +/- 19.1) than in control subjects (322 +/- 174, P < .01) and SH patients (210 +/- 71.2, P < .01). CFR in FH patients (1.59 +/- 0.41) was also significantly lower compared with both control subjects (4.22 +/- 1.42, P < .01) and SH patients (3.00 +/- 0.96, P < .01). CFR in SH patients was also significantly lower than that in control subjects (P < .05). CFR correlated significantly with both plasma total cholesterol (r = .67, P < .01) and LDL cholesterol concentrations (r = .69, P < .01). CONCLUSIONS CFR was decreased even in anatomically normal coronary arteries in hypercholesterolemic patients. This abnormality was more prominent in FH patients.
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Yokoyama I, Hayakawa A, Hayashi S, Kobayashi T, Negita M, Katayama A, Namii Y, Nagasaka T, Kojima T, Koike C, Uchida K, Takagi H. Decreased Fas antigen expression of cultured hepatocytes with FK 506. Transplant Proc 1996; 28:3189-90. [PMID: 8962237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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