3501
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Chen C, Schilling K, Hiipakka RA, Huang IY, Liao S. Prostate alpha-protein. Isolation and characterization of the polypeptide components and cholesterol binding. J Biol Chem 1982; 257:116-21. [PMID: 7198119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
alpha-Protein, a major glycoprotein in the cytosol fraction of rat ventral prostate, has a molecular weight of about 50,000 and can be dissociated, by sodium dodecyl sulfate, into two different subunits (A and B). alpha-Protein has three different polypeptide components with apparent molecular weights of 10,000 (I), 14,000 (II), and 15,000 (III). These components were purified to homogeneity and their amino acid compositions were determined. Subunit A is composed of Components I and III, whereas subunit B is composed of Components II and III. Carbohydrate was detectable only on Component III. Component III isolated from subunit A and Component III isolated from subunit B appear to be identical. The purified alpha-protein contains 0.7-1 mol of cholesterol/mol of protein. If cholesterol was removed by acetone, about 1 mol of 5 alpha-dihydrotestosterone or pregnenolone could bind to 1 mol of alpha-protein. In the presence of 2 mM ZnCl2, alpha-protein can form dimers and tetramers. In cell-free systems, alpha-protein can inhibit binding of the androgen-receptor complex to nuclear chromatin and also can promote the release of the complex already bound to chromatin. This effect is due to polypeptide Component I.
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3502
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Liao S, Chen C, Huang IY. Prostate alpha-protein. Complete amino acid sequence of the component that inhibits nuclear retention of the androgen-receptor complex. J Biol Chem 1982; 257:122-5. [PMID: 7198120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The amino acid sequence of Component I of alpha-protein, a glutamic acid-rich protein, is presented. Component I is a single chain polypeptide which consists of 88 amino acid residues with a molecular weight of 10,191. Component I has the amino acid composition Lys6, His, Arg2, Cys3, Asp5, Asn2, Thr3, Ser4, Glu13, Gln3, Pro3, Gly2, Ala6, Val9, Met4, Ile4, Leu8, Tyr6, Phe3, Trp, with serine and asparagine as NH2(-) and COOH-terminal amino acids, respectively. Automated sequences analysis of the whole protein, as well as characterization of the peptides obtained from trypsin, chymotrypsin, and staphylococcal protease digestion and cyanogen bromide treatment, led to the elucidation of the complete primary structure of this protein.
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3503
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Chen C, Cohen JS, Zadar A. Convenient continuous sonication method for the preparation of medium-sized polydeoxynucleotides. JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS 1981; 5:293-5. [PMID: 7334177 DOI: 10.1016/0165-022x(81)90040-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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3504
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Chen C, Zheng XY, Zhu PE, Gao FH, Huang WZ, Ye XY, Pan YR, Luo MZ, Yu QF. [Synthesis of organic salts of primaquine and experimental observations on their radical cure activity against malaria (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1981; 16:897-901. [PMID: 6803515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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3505
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Albers JJ, Chen C, Adolphson JL. Familial lecithin-cholesterol acyltransferase: identification of heterozygotes with half-normal enzyme activity and mass. Hum Genet 1981; 58:306-9. [PMID: 7327552 DOI: 10.1007/bf00294929] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Lecithin-cholesterol acyltransferase (LCAT) mass and activity was measured in Canadian kindred of Italian and Swedish descent with familial LCAT deficiency. Four subjects had LCAT mass of 5.21 +/- 0.87 micrograms/ml (mean +/- SD) and LCAT activity of 98.8 +/- 12.0 nmol/h/ml, well within their respective normal ranges. Five family members, including the parents, the maternal grandmother, and two of four siblings of the LCAT deficient subjects, had enzyme mass (2.85 +/- 0.32 micrograms/ml) and activity (50.8 +/- 6.3 nmol/h/ml) approximately one-half that of normal levels. These presumed heterozygotes had normal levels of apolipoproteins A-I, A-II, B and D. The two subjects with LCAT deficiency had no detectable LCAT mass (below 0.1 microgram/ml) or LCAT activity (below 0.76 nmol/h/ml), apolipoprotein A-I and D levels approximately 50% of normal, and apolipoproteins B and A-II levels only 30-35% of normal. LCAT deficiency in this family is determined by an autosomal recessive mode. Furthermore, LCAT levels and activity are determined by two autosomal codominant alleles, LCATn, the normal LCAT gene, and LCATd, the LCAT deficiency gene.
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3506
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Erkelens DW, Chen C, Mitchell CD, Glomset JA. Studies of the interaction between apolipoproteins A and C and triacylglycerol-rich particles. BIOCHIMICA ET BIOPHYSICA ACTA 1981; 665:221-33. [PMID: 7284422 DOI: 10.1016/0005-2760(81)90006-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
We studied the interaction of apolipoproteins A-I, C, and HDL2 with phospholipid-stabilized, triacylglycerol-rich particles to learn more about the molecular mechanisms that underlie the metabolism of chylomicrons. Apolipoproteins A-I, C-I, C-III1 and C-III2 all bound to and destabilized triacylglycerol-rich particles, apparently by removing phospholipids from the particle surface. None of the apolipoprotein C tested, at any concentration, was, however, able to equal the disruptive effect of apolipoprotein A-I. The destabilizing effects of apolipoproteins A-I and C were not additive. Apolipoprotein C-III1 seemed to lessen the disruptive effect of apolipoprotein A-I by binding competitively to triacylglycerol-rich particles. Unexpectedly, previous binding of apolipoprotein A-I to triacylglycerol-rich particles nearly tripled the ability of these particles to bind apolipoprotein C. Destabilization of triacylglycerol-rich particles by apolipoprotein A-I was prevented by HDL2. The protective effect of HDL2 seemed to depend partly on transfer of unesterified cholesterol from HDL2, since the amounts of unesterified cholesterol and apolipoprotein A-I bound to the particles surface showed a strong negative correlation.
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3507
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Chen C, Kilkuskie R, Hanlon S. Circular dichroism spectral properties of covalent complexes of deoxyribonucleic acid and n-butylamine. Biochemistry 1981; 20:4987-95. [PMID: 7295662 DOI: 10.1021/bi00520a027] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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3508
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Chen C, Jones WR. Application of a sperm micro-immobilization test to cervical mucus in the investigation of immunologic infertility. Fertil Steril 1981; 35:542-5. [PMID: 6785113 DOI: 10.1016/s0015-0282(16)45497-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A complement-dependent sperm micro-immobilization test for antisperm antibodies in cervical mucus was evaluated in 195 infertile women. Positive tests were obtained among 17% of women with "unexplained" and 12% with an "organic" basis for their infertility. The results confirmed previous reports of the presence of cervical mucus antibodies in the absence of corresponding activity in serum. Non-complement-dependent sperm-immobilizing activity was also detected in the cervical mucus of several patients. During a follow-up period of 9 to 24 months, 10% of those with "unexplained" infertility who had complement-dependent sperm-immobilizing antibodies in their mucus became pregnant, compared with 29% of those without antibodies. The corresponding pregnancy rates for patients with "'organic" infertility were 18% and 11%. In four patients with positive tests who subsequently conceived, further tests failed to detect the persistence of the immobilizing activity.
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3509
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Felsted RL, Leavitt RD, Chen C, Bachur NR, Dale RM. Phytohemagglutinin isolectin subunit composition. BIOCHIMICA ET BIOPHYSICA ACTA 1981; 668:132-40. [PMID: 7236703 DOI: 10.1016/0005-2795(81)90156-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The subunit compositions of individual phytohemagglutinin isolectins from red kidney bean Phaseolus vulgaris were examined by isoelectric focusing and sodium dodecyl sulfate electrophoresis on polyacrylamide gels. Isoelectric focusing reveals heterogeneous but unique and non-overlapping protein band patterns for each of the homotetrameric isolectins, E4 and L4. Isoelectric focusing of the intermediate isolectins which contain both subunits (E3L1, E2L2, and E1L3) show all the protein bands common to isolectins E4 or L4 in proportions relative to their suggested subunit compositions. Polyacrylamide gel electrophoresis in a continuous sodium dodecyl sulfate buffer system gives a single protein band for all of the isolectins. In contrast, a discontinuous sodium dodecyl sulfate buffer procedure resolves isolectins E4 and L4 into single major protein bands of apparent molecular weights 31 700 (+/-600) and 29 900 (+/-200), respectively. Each of the intermediate isolectins contained both protein bands and their relative proportion, as determined by absorbance scanning, confirms the phytohemagglutinin isolectin subunit compositions as E4, E3L1, E2L2, E1L3, and L4.
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3510
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Sredni B, Tse HY, Chen C, Schwartz RH. Antigen-specific clones of proliferating T lymphocytes. I. Methodology, specificity, and MHC restriction. THE JOURNAL OF IMMUNOLOGY 1981. [DOI: 10.4049/jimmunol.126.1.341] [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
In this report we describe in detail a new method for cloning antigen-specific, proliferating T lymphocytes directly from primed murine lymph nodes after 3 days of activation in vitro. After expansion in liquid culture the cells from the colonies were shown to be antigen specific and to require I-A histocompatible, irradiated spleen cells for stimulation. For hapten-carrier-type antigens, the T cells were shown to be carrier specific in their recognition but they were also capable of distinguishing the presence of the hapten. Recloning of small numbers of these cells in soft agar under conditions of high plating efficiency yielded true clones (i.e., populations derived from a single cell) whose antigen specificity was identical to that of cells from the original colony. The fact that a clone of T cells was I-A restricted in its antigen recognition demonstrates that suppressor T cell function cannot account for the phenomenon of major histocompatibility complex restriction.
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3511
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Sredni B, Tse HY, Chen C, Schwartz RH. Antigen-specific clones of proliferating T lymphocytes. I. Methodology, specificity, and MHC restriction. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1981; 126:341-7. [PMID: 6161167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
In this report we describe in detail a new method for cloning antigen-specific, proliferating T lymphocytes directly from primed murine lymph nodes after 3 days of activation in vitro. After expansion in liquid culture the cells from the colonies were shown to be antigen specific and to require I-A histocompatible, irradiated spleen cells for stimulation. For hapten-carrier-type antigens, the T cells were shown to be carrier specific in their recognition but they were also capable of distinguishing the presence of the hapten. Recloning of small numbers of these cells in soft agar under conditions of high plating efficiency yielded true clones (i.e., populations derived from a single cell) whose antigen specificity was identical to that of cells from the original colony. The fact that a clone of T cells was I-A restricted in its antigen recognition demonstrates that suppressor T cell function cannot account for the phenomenon of major histocompatibility complex restriction.
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3512
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Schwartz RH, Chen C, Paul WE. Gene complementation in the T lymphocyte proliferative response to poly (Glu56Lys35Phe9)n. Functional evidence for a restriction element coded for by both the I-A and I-E subregions. Eur J Immunol 1980; 10:708-14. [PMID: 6968269 DOI: 10.1002/eji.1830100910] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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3513
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Lu HM, Chen C, Sze PC, Ming TH, Chiang KL, Ting CR, Pan LX, Liu TY, Yiu C. The significance of 5'-nucleotide phosphodiesterase isozymes in the diagnosis of liver carcinoma. Int J Cancer 1980; 26:31-5. [PMID: 6263804 DOI: 10.1002/ijc.2910260106] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The results of determination of the serum 5'-NPDase isozymes in 95 cases of primary liver carcinoma and other kinds of disease are presented. The 5'-NPDase-V was positive in 83.2% of primary liver cancer cases. This test might be a useful supplement to AFP determination, especially in AFP-negative liver cancer patients. In most patients who had undergone successful liver resection for primary carcinoma, the test became negative. A positive 5'NPDase-V test in patients with cancer elsewhere in the body may suggest liver metastasis. In addition, this test may be of some help in the differentiation of primary liver cancer from other kinds of liver disease. The problem of "false-positive" results of this test is discussed.
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3514
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Chen C, Melitz DK, Petschow B, Eckert RL. Isolation of cytokinin-binding protein from plant tissues by affinity chromatography. EUROPEAN JOURNAL OF BIOCHEMISTRY 1980; 108:379-87. [PMID: 7408857 DOI: 10.1111/j.1432-1033.1980.tb04733.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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3515
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Ultee ME, Margoliash E, Lipkowski A, Flouret G, Solinger AM, Lebwohl D, Matis LA, Chen C, Schwartz RH. The T lymphocyte response to cytochrome c--II. Molecular characterization of a pigeon cytochrome c determinant recognized by proliferating T lymphocytes of the B10.A mouse. Mol Immunol 1980; 17:809-22. [PMID: 6163966 DOI: 10.1016/0161-5890(80)90030-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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3516
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Chen C, Moreadith F. Seismic qualification of equipment — research needs. NUCLEAR ENGINEERING AND DESIGN 1980. [DOI: 10.1016/0029-5493(80)90290-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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3517
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Lino S, Smythe S, Tymoczko JL, Rossini GP, Chen C, Hiipakka RA. RNA-dependent release of androgen and other steroidreceptor complexes from DNA. J Biol Chem 1980; 255:5545-51. [PMID: 6155376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
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3518
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Lino S, Smythe S, Tymoczko J, Rossini G, Chen C, Hiipakka R. RNA-dependent release of androgen and other steroidreceptor complexes from DNA. J Biol Chem 1980. [DOI: 10.1016/s0021-9258(19)70664-4] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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3519
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Laskowski P, Chen C. Bond cleavage of diethylstilbestrol of vicinal diol by a rat liver enzyme. Arch Biochem Biophys 1980; 202:318-9. [PMID: 7396535 DOI: 10.1016/0003-9861(80)90433-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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3520
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Chen C. Immunological infertility--management and prognosis. CLINICS IN OBSTETRICS AND GYNAECOLOGY 1979; 6:403-23. [PMID: 389522] [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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3521
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Zheng XY, Xia Y, Gao FH, Chen C. [Synthesis of 7351, a new antimalarial drug (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1979; 14:736-7. [PMID: 554435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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3522
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Wang SC, Liu CB, Chen C. [Cholesterol labeled with radioiodine (author's transl)]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1979; 1:29-34. [PMID: 262809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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3523
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Dryden FD, Chen C, Selna MW. Virus removal in advanced wastewater treatment systems. JOURNAL - WATER POLLUTION CONTROL FEDERATION 1979; 51:2098-109. [PMID: 522214] [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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3524
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Chen C, Hiipakka RA, Liao S. Prostate alpha-protein: subunit structure, polyamine binding, and inhibition of nuclear chromatin binding of androgen-receptor complex. JOURNAL OF STEROID BIOCHEMISTRY 1979; 11:401-5. [PMID: 573818 DOI: 10.1016/0022-4731(79)90058-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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3525
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Abstract
An experimental model was developed that will produce femoral vein occlusion greater than 90% of the time in rats weighing less than 500 grams. This standard venous clot, produced by combining intimal trauma with local venous stasis, can simulate clinical crush and replantation problems. Using this standard clot model, Thrombolysin was injected in the femoral artery after trauma to the vein but before venous stasis. Femoral vein patency was determined at the end of the 30 minute period of venous stasis. With the appropriate dosage, ipsilateral venous occlusion was prevented (P less than 0.00001) without preventing contralateral venous occlusion (P less than 0.02). Except for decreased fibrinogen levels, there was no significant change in the factors studied between the control and experimental groups. It is possible, therefore, to prevent thrombosis in a vein with intimal damage, even in the presence of a low-flow state by the local injection of Thrombolysin, without producing systemic anticoagulation.
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