1076
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Leevy CM, Chen T. Ethanol inhibition of liver regeneration. Gastroenterology 1979; 77:1151-3. [PMID: 488641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
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1077
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Blumchen G, Scharf-Bornhofen E, Chen T, Menning E, Barthel W. Comparison of coronary angiography and thallium-201. Studies in patients with coronary heart disease. ANNALES DE RADIOLOGIE 1979; 22:308-9. [PMID: 496267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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1078
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Jansons VK, Weis P, Chen T, Redwood WR. In vitro interaction of L1210 cells with phospholipid vesicles. Cancer Res 1978; 38:530-5. [PMID: 564235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The in vitro uptake of phospholipid vesicles by mouse leukemia L1210 cells was examined. Liposomes were generated by prolonged ultrasonic dispersion of aqueous dispersions of mixed lipids in the presence of radiolabeled inulin. Multilamellar vesicles were separated from unilamellar vesicles by column chromatography. Vesicle populations were examined by electron microscopy. Neutral vesicles were generated from egg yolk phosphatidylcholine and cholesterol, and surface charge was introduced via either phosphatidylserine or octadecylamine. Uptake, measured as cell-associated radioactivity, was temperature dependent and was strongly decreased by metabolic inhibitors. These results suggested that liposomes are taken up to a major extent by an energy-dependent mechanism. The uptake of liposomes by cells of a young culture was about 2-fold higher than was the uptake of liposomes by cells of a stationary culture. The uptake of positively charged liposomes by cells was about 20-fold higher than that of either neutral or negatively charged vesicles. About one-half of the cell-associated radioactivity transferred by positively charged liposomes could be removed by cell surface treatment with trypsin or neuraminidase or by a short exposure to 0.6 N NaCl.
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1079
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Kanagasundaram N, Kakumu S, Chen T, Leevy CM. Alcoholic hyalin antigen (AHAg) and antibody (AHAb) in alcoholic hepatitis. Gastroenterology 1977; 73:1368-73. [PMID: 72016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Complement fixation (CF) and immune adherence (IA) hemagglutination tests demonstrate antigen (Ag) and antibody (Ab) to alcoholic hyalin (AH) in serum of patients with alcoholic hepatitis. Immunoglobulins from postmortem liver of patients dying of alcoholic hepatitis show antibody activity against AH. Isolated purified AH was used to produce AHAb in rabbits. Rabbit antiserum was added to heat-inactivated human serum to detect AHAg; purified AH was added to serum and tissue elutes to detect AHAb. AHAg was present in serum of each of 15 patients with early phase alcoholic hepatitis in CF titers of 8 to 64 and IA titers of 16 to 2048. AHAg became negative within 3 to 5 weeks with abstinence from alcohol and was followed by transient appearance of AHAb. AHAb was present in 11 patients with advanced phases of alcoholic hepatitis in CF titers of 8 to 640 and IA titers of 16 to 4096. Four patients in this group exhibited concomitant AHAb and AHAg. Investigations of liver tissue elute reveal that patients with advanced alcoholic hepatitis or active alcoholic cirrhosis have AHAg-reactive immune complexes containing IgG and IgA immunoglobulins.
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1080
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Carroll FI, Brine GA, Chen T, Kohl DW, Welch CD. Synthesis of (-)-alpha-acetylmethadol metabolites and related compounds. J Org Chem 1976; 41:3521-4. [PMID: 978303 DOI: 10.1021/jo00884a006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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1081
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Chen T, Leevy CM. Lymphocyte proliferation inhibitory factor (PIF) in alcoholic liver disease. Clin Exp Immunol 1976; 26:42-5. [PMID: 1000881 PMCID: PMC1540830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Lymphocyte proliferation inhibitory factor (PIF) was determined in the supernatants of PHA-stimulated lymphocytes from patients with alcoholic liver disease. PIF was assayed by determining inhibition of DNA synthesis in WI-38 human lung fibroblasts. A two-fold greater inhibition in thymidine incorporation into DNA by lung fibroblasts was observed in supernatants of PHA stimulated lymphocytes from patients with alcoholic hepatitis or active Laennec's cirrhosis as compared with that found in control subjects or patients with fatty liver. It is suggested that decreased liver cell regeneration seen in some patients with alcoholic hepatitis may be due to increased elaboration of PIF.
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1082
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Chen T, Hodgetts RB. Some properties of dopa decarboxylase from Sarcophaga bullata. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. B, COMPARATIVE BIOCHEMISTRY 1976; 53:415-8. [PMID: 3361 DOI: 10.1016/0305-0491(76)90350-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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1083
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Dyrszka H, Salen G, Zaki FG, Chen T, Mosbach EH. Hepatic toxicity in the rhesus monkey treated with chenodeoxycholic acid for 6 months: biochemical and ultrastructural studies. Gastroenterology 1976; 70:93-104. [PMID: 812760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
The long term administration of chenodeoxycholic acid in man has to be regarded with caution because chenodeoxycholic acid has caused liver damage in various species of animals, including primates. To study the effect of three doses of chenodeoxycholic acid (10, 40, and 100 mg per kg per day) on hepatic function and morphology, biliary bile acid composition and the reversibility of changes were investigated in 22 rhesus monkeys. After 6 months of treatment with 40 and 100 mg per kg per day, bile duct proliferation, portal tract inflammation and fibrosis, bile canalicular bleb formation, and hypertrophy of the smooth endoplasmic reticulum were associated with elevated serum levels of oxaloacetic transaminase, glutamic pyruvic transaminase, and leucine aminopeptidase. In the bile, the proportion of chenodeoxycholic acid and its bacterial metabolite, lithocholic acid, rose to approximately 85 and 10% of the total bile acids. After chenodeoxycholic acid was withdrawn for 3 months, the hepatic morphological lesions persisted in some animals although biliary bile acid composition returned to normal. No hepatic abnormalities were seen in the animals treated with 10 mg per kg per day. The findings suggest that long term treatment of rhesus monkeys with high doses of chenodeoxycholic acid results in severe hepatic histological lesions that can persist after discontinuation of the bile acid.
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1084
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Chen T, Stute A. [Diurnal profile curves of thyroid hormones in patients with primary hypothyreosis under thyroid hormone substitution therapy]. DIE MEDIZINISCHE WELT 1975; 26:2335-7. [PMID: 1223597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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1085
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Dyrszka H, Chen T, Salen G, Mosbach EH. Toxicity of chenodeoxycholic acid in the rhesus monkey. Gastroenterology 1975; 69:333-7. [PMID: 1150041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Chenodeoxycholic acid is an important drug for the treatment of cholesterol cholelithiasis in man. Although no toxicity has been demostrated in man, liver lesions develop in rhesus monkeys treated with chenodeoxycholic acid. To elucidate the mechanism of toxicity, chenodeoxycholic acid. To elucidate the mechanism of toxicity, chenodeoxycholic acid was fed daily to three groups of 6 animals each at the following dose: 10, 40, and 100 mg per kg; 2 separate animals were not treated and served as controls. After 1 month, the animals were killed. During the treatment period, most blood tests (e.g., blood count, blood urea nitrogen, albumin, SGOT, lactate dehydrogenase) remained within normal limits, but there was a significant dose-related increase in serum leucine aminopeptidase levels. The percentage of lithochlic acid, the 7-dehydroxylated bacterial metabolite of chenodeoxycholic acid, rose from 1% in the control animal to almost 14% in the 100 mg per kg-treated group. Liver biopsies obtained before treatment and at necropsy showed no significant changes. Thus, exposure of the liver to increased amounts of lithocholic acid during chenodeoxycholic acid treatment might result in elevation of serum leucine aminopeptidase activity.
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1086
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Moore L, Chen T, Knapp HR, Landon EJ. Energy-dependent calcium sequestration activity in rat liver microsomes. J Biol Chem 1975; 250:4562-8. [PMID: 806589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
MgATP-dependent calcium sequestering activity of rat liver microsomes has been characterized. This activity is linear over a 90-min period and specifically requires MgATP. Substitution of CTP, UTP, GTP, or ADP will not support calcium uptake. Oxalate, which serves as a trapping agent in calcium uptake of skeletal muscle microsomes, is required to maintain net accumulation of calcium. The reaction is temperature-dependent and has an apparent Vmax of 11.2 nmol/mg of protein/min. The apparent Km for calcium is 23.2 muM calculated from total calcium concentration, and approximately 4.6 muM based on free calcium concentration, and apparent Km for ATP is 1.8 mM. Calcium uptake activity normally measured in presence of 100 mM KCl is only slightly depressed if 100 mM NaCl is substituted and is considerably depressed when 200 mM sucrose replaces KCl. An appropriate hydrolysis of ATP is associated with the calcium uptake. Separation of smooth and rough endoplasmic reticulum on sucrose gradients indicates a considerably lower specific activity per mg of protein in the fraction enriched with rough endoplasmic reticulum. Azide, at a level which completely inhibits liver mitochondrial calcium sequestration, has no effect on the liver microsomal system. Oligomycin, which inhibits ATP-dependent calcium uptake of liver mitochondria, has a considerably lesser effect on calcium uptake of liver microsomes. p-Chloromercuribenzoate and mersalyl inhibit the liver microsomal calcium pump at levels as low as 10- minus 7 M. Calcium uptake activity is considerably reduced in adult female rats. Weanling rats, both male and female, have calcium uptake activities like that of the adult males. Because of the higher activity in the male rat, the fatty acid composition of the liver microsomal phospholipids was analyzed. The male rat had a higher percentage of linoleic and palmitic acids in the microsomal phospholipids. Endoplasmic reticulum and plasma membrane are postulated to play a role in regulation of the levels of free cytoplasmic calcium in the mammalian liver.
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1087
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Moore L, Chen T, Knapp HR, Landon EJ. Energy-dependent calcium sequestration activity in rat liver microsomes. J Biol Chem 1975. [DOI: 10.1016/s0021-9258(19)41338-0] [Citation(s) in RCA: 211] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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1088
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Salen G, Dyrszka H, Chen T, Saltzman WH, Mosbach EH. Letter Prevention of chenodeoxycholic-acid toxicity with lincomycin. Lancet 1975; 1:1082. [PMID: 48742 DOI: 10.1016/s0140-6736(75)91844-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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1089
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1090
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Watanabe M, Phillips K, Chen T. Steroid-receptor in Pseudomonas testosteroni released by osmotic shock. JOURNAL OF STEROID BIOCHEMISTRY 1973; 4:613-21. [PMID: 4363616 DOI: 10.1016/0022-4731(73)90036-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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1091
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Ruddle F, Ricciuti F, McMorris FA, Darlington G, Chen T. Somatic cell genetic assignment of peptidase C and the Rh linkage group to chromosome A-1 in man. Science 1972; 176:1429-31. [PMID: 4113665 DOI: 10.1126/science.176.4042.1429] [Citation(s) in RCA: 67] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The segregation of the human peptidase-C phenotype in five different series of human-mouse hybrid clones was examined. The chromosome constitution of these hybrids was determined by quinacrine mustard fluorescence, Giemsa banding, and constitutive heterochromatin staining. That the clones could be classified without exception either as human peptidase C positive/ A-1 positive (14 clones), or as peptidase C negative/ A-1 negative (12 clones) indicates that peptidase C can be assigned to the human A-i chromosome. Data from an extensive series of human-mouse clones used provide support for the syntenic association between peptidase C and phosphoglucomutase-1 and by inference a linkage of both to Rh factor group.
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1092
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Chen T. Post-operative follow-up study of trophoblastic tumors using radioimmunoassay for HCG and LH. ACTA OBSTETRICA ET GYNAECOLOGICA JAPONICA 1971; 18:13-8. [PMID: 4326707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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1093
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Klebe RJ, Chen T, Ruddle RH. Mapping of a human genetic regulator element by somatic cell genetic analysis. Proc Natl Acad Sci U S A 1970; 66:1220-7. [PMID: 4920091 PMCID: PMC335809 DOI: 10.1073/pnas.66.4.1220] [Citation(s) in RCA: 78] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
The ES-2 esterase is a kidney-associated esterase and is expressed in a cloned mouse renal adenocarcinoma cell line. Somatic cell hybridization of the mouse renal adenocarcinoma with either mouse or human fibroblasts leads to the marked reduction of ES-2 esterase titer. The extinction of ES-2 esterase activity in mousexhuman hybrids is reversible. Extinction correlates with the presence of the human C(10) chromosome in the somatic cell hybrids; whereas reexpression of the ES-2 esterase is observed in hybrids which have lost C(10). Thus, the proposed regulator element involved is probably structurally linked to C(10); however, linkage to a member of the D or G groups cannot be completely excluded.
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1094
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Yu JY, Hsieh SC, Tai TY, Wang TH, Chen JS, Shih PL, Chen T. Endemic anicteric infectious hepatitis in the dormitories of National Taiwan University. TAIWAN YI XUE HUI ZA ZHI. JOURNAL OF THE FORMOSAN MEDICAL ASSOCIATION 1970; 69:353-61. [PMID: 5290112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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1095
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Ruddle FH, Chen T, Shows TB, Silagi S. Interstrain somatic cell hybrids in the mouse. Chromosome and enzyme analyses. Exp Cell Res 1970; 60:139-47. [PMID: 5424308 DOI: 10.1016/0014-4827(70)90499-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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1096
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Klebe RJ, Chen T, Ruddle FH. Controlled production of proliferating somatic cell hybrids. J Biophys Biochem Cytol 1970; 45:74-82. [PMID: 4318843 PMCID: PMC2107999 DOI: 10.1083/jcb.45.1.74] [Citation(s) in RCA: 209] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
The techniques described permit the controlled production of large numbers of proliferating somatic cell hybrids in a relatively short period of time. Sendai virus is used to promote cell hybridization. beta-propriolactone is employed as the inactivating agent of Sendai virus since it produces complete loss of viral infectivity while preserving viral fusion capacity. Cells are fused in monolayer, instead of in suspension, since fixing cells in two dimensions permits one to control cell contacts during the fusion event through the expedient of varying multiplicities of the parental cells and the total cell density. Under the conditions described, a several hundred fold increase in the number of hybrid clones obtained is seen as compared to the controls.
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1097
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Cousins RJ, DeLuca HF, Chen T, Suda T, Tanaka Y. Metabolism and subcellular location of 25-hydroxycholecalciferol in intestinal mucosa. Biochemistry 1970; 9:1453-9. [PMID: 4313884 DOI: 10.1021/bi00808a021] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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1098
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Hasegawa Y, Itazu Y, Chen T. [Hypochromic anemia resistant to iron preparations]. NAIKA. INTERNAL MEDICINE 1969; 24:1055-9. [PMID: 5360071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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1099
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Chen T, Lai CH. Fibrinogen assay by an immunodiffusion plate. TECHNICAL BULLETIN OF THE REGISTRY OF MEDICAL TECHNOLOGISTS. AMERICAN SOCIETY OF CLINICAL PATHOLOGISTS. REGISTRY OF MEDICAL TECHNOLOGISTS 1969; 39:231-2. [PMID: 4981244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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1100
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Chen T, Tsai SH. Treatment of diabetes mellitus with N-(P-chlorobenzensulfonyl)N'-pyrrolidinourea (deamelin-S)-with double-blind method. TAIWAN YI XUE HUI ZA ZHI. JOURNAL OF THE FORMOSAN MEDICAL ASSOCIATION 1968; 67:391-403. [PMID: 4894669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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