1
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Omaye ST, Turnbull JD, Sauberlich HE. Selected methods for the determination of ascorbic acid in animal cells, tissues, and fluids. Methods Enzymol 1979; 62:3-11. [PMID: 440112 DOI: 10.1016/0076-6879(79)62181-x] [Citation(s) in RCA: 947] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Comparative Study |
46 |
947 |
2
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Provvedini DM, Tsoukas CD, Deftos LJ, Manolagas SC. 1,25-dihydroxyvitamin D3 receptors in human leukocytes. Science 1983; 221:1181-3. [PMID: 6310748 DOI: 10.1126/science.6310748] [Citation(s) in RCA: 743] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A 1,25-dihydroxyvitamin D3 receptor macromolecule was detected in peripheral mononuclear leukocytes from normal humans. This macromolecule was found to be present in monocytes but absent from normal resting peripheral B and T lymphocytes. However, it was present in established lines of malignant B, T, and non-B, non-T human lymphocytes, as well as in T and B lymphocytes obtained from normal humans and activated in vitro.
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743 |
3
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Abstract
Lactoferrin, an iron-binding protein previously shown to occur in many external secretions, is identified as one of the major proteins present in human and guinea pig neutrophilic polymorphonuclear leukocytes. The identification of this protein in leukocyte extracts was based upon a comparison of its electrophoretic, antigenic, and iron-combining properties with the corresponding properties of the same protein isolated from human and guinea pig milk. Immunochemical quantitations showed that lactoferrin occurs in human neutrophilic leukocytes at the concentration of 3 microg per 10(6) cells. Tissue cultures from guinea pig bone marrow and spleen actively synthesized the protein, as shown both by net production of lactoferrin and incorporation of labeled amino acids into the protein. Immunohistochemical data indicate that lactoferrin first appears in myeloid cells at the stage of the promyelocyte.
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research-article |
56 |
494 |
4
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Trahey M, Wong G, Halenbeck R, Rubinfeld B, Martin GA, Ladner M, Long CM, Crosier WJ, Watt K, Koths K. Molecular cloning of two types of GAP complementary DNA from human placenta. Science 1988; 242:1697-700. [PMID: 3201259 DOI: 10.1126/science.3201259] [Citation(s) in RCA: 403] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The ras p21 GTPase-activating protein (GAP) was purified from human placental tissue. Internal amino acid sequence was obtained from this 120,000-dalton protein and, by means of this sequence, two types of complementary DNA clones were isolated and characterized. One type encoded GAP with a predicted molecular mass of 116,000 daltons and 96% identity with bovine GAP. The messenger RNA of this GAP was detected in human lung, brain, liver, leukocytes, and placenta. The second type appeared to be generated by a differential splicing mechanism and encoded a novel form of GAP with a predicted molecular mass of 100,400 daltons. This protein lacks the hydrophobic amino terminus characteristic of the larger species, but retains GAP activity. The messenger RNA of this type was abundantly expressed in placenta and in several human cell lines, but not in adult tissues.
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37 |
403 |
5
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Ward HP, Block MH. The natural history of agnogenic myeloid metaplasia (AMM) and a critical evaluation of its relationship with the myeloproliferative syndrome. Medicine (Baltimore) 1971; 50:357-420. [PMID: 4940717 DOI: 10.1097/00005792-197109000-00001] [Citation(s) in RCA: 397] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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Review |
54 |
397 |
6
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Janoff A, Scherer J. Mediators of inflammation in leukocyte lysosomes. IX. Elastinolytic activity in granules of human polymorphonuclear leukocytes. J Exp Med 1968; 128:1137-55. [PMID: 5303065 PMCID: PMC2138566 DOI: 10.1084/jem.128.5.1137] [Citation(s) in RCA: 305] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
The present study demonstrates that a granule fraction derived from human polymorphonuclear leukocytes possesses elastinolytic activity, and that the latter can be separated from the collagenase present in these cells. Properties of the human leukocyte elastase differ sufficiently from those of pancreatic elastases of different species as to suggest that the former enzyme is a distinct and separate entity. Thus, soybean trypsin inhibitor and salivary kallikrein inhibitor (Trasylol) fail to inhibit elastolysis by the pancreatic enzyme, but do inhibit the leukocyte elastinolytic agent. Elastolysis by human leukocyte granule extract does not show significant salt inhibition, whereas that catalyzed by pancreatic elastase is markedly reduced when ionic strength is increased to physiological levels. The leukocyte granule extract is at least 10 times more resistant to serum elastase inhibitor than is the purified pancreatic enzyme. Both enzymes show optimal elastolysis above pH 8.5, but the leukocyte factor still retains 50% of its maximal elastolytic activity at pH 6-7; whereas the activity of the pancreatic enzyme falls to 10% or less of its maximal value under the same conditions. The foregoing characteristics of the human leukocyte elastase suggest that it, rather than pancreatic (serum) elastase, may mediate pathological elastolysis during acute arteritis in man. In keeping with this suggestion, the present experiments also show that elastica staining of human arterial vessels is reduced by incubation of tissues with human leukocyte granule extracts in vitro.
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research-article |
57 |
305 |
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George JN, Pickett EB, Saucerman S, McEver RP, Kunicki TJ, Kieffer N, Newman PJ. Platelet surface glycoproteins. Studies on resting and activated platelets and platelet membrane microparticles in normal subjects, and observations in patients during adult respiratory distress syndrome and cardiac surgery. J Clin Invest 1986; 78:340-8. [PMID: 2942561 PMCID: PMC423547 DOI: 10.1172/jci112582] [Citation(s) in RCA: 294] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
The accurate definition of surface glycoprotein abnormalities in circulating platelets may provide better understanding of bleeding and thrombotic disorders. Platelet surface glycoproteins were measured on intact platelets in whole blood and platelet membrane microparticles were assayed in cell-free plasma using 125I-monoclonal antibodies. The glycoproteins (GP) studied were: GP Ib and GP IIb-IIIa, two of the major intrinsic plasma membrane glycoproteins; GMP-140, an alpha-granule membrane glycoprotein that becomes exposed on the platelet surface following secretion; and thrombospondin (TSP), an alpha-granule secreted glycoprotein that rebinds to the platelet surface. Thrombin-induced secretion in normal platelets caused the appearance of GMP-140 and TSP on the platelet surface, increased exposure of GP IIb-IIIa, and decreased antibody binding to GP Ib. Patients with adult respiratory distress syndrome had an increased concentration of GMP-140 and TSP on the surface of their platelets, demonstrating in vivo platelet secretion, but had no increase of platelet microparticles in their plasma. In contrast, patients after cardiac surgery with cardiopulmonary bypass demonstrated changes consistent with membrane fragmentation without secretion: a decreased platelet surface concentration of GP Ib and GP IIb with no increase of GMP-140 and TSP, and an increased plasma concentration of platelet membrane microparticles. These methods will help to define acquired abnormalities of platelet surface glycoproteins.
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research-article |
39 |
294 |
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Van Dilla MA, Trujillo TT, Mullaney PF, Coulter JR. Cell microfluorometry: a method for rapid fluorescence measurement. Science 1969; 163:1213-4. [PMID: 5812751 DOI: 10.1126/science.163.3872.1213] [Citation(s) in RCA: 279] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
A high-speed flow system for quantitative determination of fluoresence of cells containing fluorochrome has been developed. Feulgen-DNA distributions in populations of tissue culture cells and human leukocytes havebeen measured at a rate of 10(4) to 10(5) cells per minute and compare well with results of other independent methods.
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56 |
279 |
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Merigan TC, Rand KH, Pollard RB, Abdallah PS, Jordan GW, Fried RP. Human leukocyte interferon for the treatment of herpes zoster in patients with cancer. N Engl J Med 1978; 298:981-7. [PMID: 347294 DOI: 10.1056/nejm197805042981801] [Citation(s) in RCA: 262] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
We tested the effect of human leukocyte interferon on early localized herpes zoster infections in three placebo-controlled, randomized double-blind trials involving 90 patients with cancer. There were no significant differences in pretreatment severity of infection or nature of underlying disease in the groups. Higher dosages of more purified interferon in the second and third trials produced a significant (P less than or equal to 0.01) decrease in cutaneous dissemination. No dissemination occurred in those receiving the highest dosage (5.1 x 10(5) U per kilogram per day) (P less than or equal to 0.025). The number of days of new-vesicle formation in the primary dermatome decreased (mean, 2.3 days, P less than or equal to 0.05) in this group. Treated patients had a trend toward less acute pain, and significantly (P less than or equal to 0.05) diminished severity of post-herpetic neuralgia, at the two highest dosage levels. Visceral complications were six times less frequent in interferon recipients. High-dosage interferon appeared effective in limiting cutaneous dissemination, visceral complications and progression within the primary dermatome.
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Clinical Trial |
47 |
262 |
10
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Peterson PA, Cunningham BA, Berggård I, Edelman GM. 2 -Microglobulin--a free immunoglobulin domain. Proc Natl Acad Sci U S A 1972; 69:1697-701. [PMID: 4558655 PMCID: PMC426781 DOI: 10.1073/pnas.69.7.1697] [Citation(s) in RCA: 253] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Analysis of the primary structure of beta(2)-microglobulin indicates that this human protein is homologous in sequence to the constant portion of immunoglobulin light chains (C(L)), and to the homology regions (C(H)1, C(H)2, and C(H)3) of the constant portion of gamma1 (heavy) chains of immunoglobulin G. Homology with the C(H)3 region is particularly striking. No convincing homology could be demonstrated by similar comparisons with the variable regions of immunoglobulin light and heavy chains. beta(2)-Microglobulin contains an intrachain disulfide loop of 57 amino-acid residues that is similar in size to disulfide loops found in the constant regions of immunoglobulin G. These findings suggest that beta(2)-microglobulin is a free immunoglobulin domain, possibly serving an effector function similar to that of the C(H)3 domain of gamma1 chains of immunoglobulin G.
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research-article |
53 |
253 |
11
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Secher DS, Burke DC. A monoclonal antibody for large-scale purification of human leukocyte interferon. Nature 1980; 285:446-50. [PMID: 6157091 DOI: 10.1038/285446a0] [Citation(s) in RCA: 244] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A clone of hybrid myelomas (NK2), secreting a mouse monoclonal antibody to human leukocyte interferon, has been isolated. The antibody neutralizes the antiviral activity of the interferon and, when covalently attached to a solid support and used as an immunoadsorbent, allows interferon purification of up to 5,000-fold in a single step.
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45 |
244 |
12
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Aubourg P, Blanche S, Jambaqué I, Rocchiccioli F, Kalifa G, Naud-Saudreau C, Rolland MO, Debré M, Chaussain JL, Griscelli C. Reversal of early neurologic and neuroradiologic manifestations of X-linked adrenoleukodystrophy by bone marrow transplantation. N Engl J Med 1990; 322:1860-6. [PMID: 2348839 DOI: 10.1056/nejm199006283222607] [Citation(s) in RCA: 229] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Case Reports |
35 |
229 |
13
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Sarkar G, Sommer SS. Access to a messenger RNA sequence or its protein product is not limited by tissue or species specificity. Science 1989; 244:331-4. [PMID: 2565599 DOI: 10.1126/science.2565599] [Citation(s) in RCA: 226] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
RNA amplification with transcript sequencing (RAWTS) is a rapid and sensitive method of direct sequencing that involves complementary DNA synthesis, polymerase chain reaction (PCR) with a primer or primers containing a phage promoter, transcription from the phage promoter, and reverse transcriptase-mediated sequencing. By means of RAWTS, it was possible to sequence each of four tissue-specific human messenger RNAs (blue pigment, factor IX, phenylalanine hydroxylase, and tyrosine hydroxylase) in four cell types examined (white blood cells, liver, K562 erythroleukemia cells, and chorionic villus cells). These results indicate that there is a basal rate of transcription, splicing, and polyadenylation of tissue-specific mRNAs in adult and embryonic tissues. In addition to revealing sequence information, it is possible to generate a desired in vitro translation product by incorporating a translation initiation signal into the appropriate PCR primer. RAWTS can be used to obtain novel mRNA sequence information from other species as illustrated with a segment of the catalytic domain of factor IX. In general, the ability to obtain mRNA sequences rapidly across species boundaries should aid both the study of protein evolution and the identification of sequences crucial for protein structure and function.
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36 |
226 |
14
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Buttriss JL, Diplock AT. High-performance liquid chromatography methods for vitamin E in tissues. Methods Enzymol 1984; 105:131-8. [PMID: 6727661 DOI: 10.1016/s0076-6879(84)05018-7] [Citation(s) in RCA: 224] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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41 |
224 |
15
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Parker CW, Smith JW. Alterations in cyclic adenosine monophosphate metabolism in human bronchial asthma. I. Leukocyte responsiveness to -adrenergic agents. J Clin Invest 1973; 52:48-59. [PMID: 4404909 PMCID: PMC302226 DOI: 10.1172/jci107173] [Citation(s) in RCA: 223] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
In an effort to better define the role of betaadrenergic blockade in human bronchial asthma, peripheral blood leukocytes and lymphocytes from individuals with this condition were studied for possible alterations in cyclic AMP metabolism. Using a previously described radioimmunoassay to measure cyclic AMP, cells from asthmatic subjects were shown to have a highly significant decrease in their cyclic AMP response to beta-adrenergic agents (isoproterenol, norepinephrine, and epinephrine) by comparison with normal control cells. The alteration in responsiveness was most marked at the time of severe active asthma and returned toward normal during periods of clinical remission. Evidence was presented to indicate that the reduced response in cells from asthmatic individuals was not due to marked alterations in the proportion of T and B lymphocytes. Five normal volunteers were treated with an oral bronchodilator preparation containing theophylline and ephedrine over a 2 wk period without a significant change in the lymphocyte cyclic AMP response. These results provide unambiguous evidence for altered adrenergic responsiveness in bronchial asthma and indicate that purified peripheral blood lymphocytes should be a suitable in vitro system for further elucidation of the abnormality. Despite the reduction in catecholamine responsiveness in the asthmatic population as a whole, major alterations were largely restricted to individuals with severe, chronic asthma. Conclusive evidence for beta-adrenergic blockade in individuals who have not had recent asthmatic symptoms was not obtained, casting some doubt on the theory that bronchial asthma is due to a congenital derangement of cyclic AMP metabolism. Moreover, transient episodes of bronchospasm were often accompanied by a normal cyclic AMP response indicating that episodes of asthma frequently occur in the absence of easily demonstrable adrenergic blockade.
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52 |
223 |
16
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Baggiolini M, Hirsch JG, De Duve C. Resolution of granules from rabbit heterophil leukocytes into distinct populations by zonal sedimentation. J Cell Biol 1969; 40:529-41. [PMID: 5812474 PMCID: PMC2107611 DOI: 10.1083/jcb.40.2.529] [Citation(s) in RCA: 223] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Postnuclear supernates from homogenates of essentially pure rabbit heterophil leukocytes were fractionated by means of zonal differential centrifugation through a discontinuous sucrose gradient at various speeds. Three distinct groups of granules were characterized biochemically and morphologically. They were, in order of decreasing sedimentation coefficient: (a) Large, relatively dense granules, identified morphologically as the azurophil or primary granules, and containing essentially all of the myeloperoxidase activity of the preparations, about one-third of their lysozyme activity, and between 50 and 80% of their content in five acid hydrolases typically associated with lysosomes in other cells; (b) smaller, less dense granules, with the morphological appearance of the specific or secondary granules, and carrying most of the alkaline phosphatase and the remainder of the lysozyme activity of the preparations; (c) a second group of lysosome-like particles, associated with a morphologically heterogeneous fraction, and containing the remainder of the acid hydrolases, but little or no myeloperoxidase. When p-nitrophenyl phosphate was used instead of beta-glycerophosphate for the assay of acid phosphatase, only small proportions of the total activity accompanied the two main lysosomal bands, and considerable activity was found in a zone slightly retarded with respect to the slowly moving band of acid hydrolases.
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research-article |
56 |
223 |
17
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Royle NJ, Clarkson RE, Wong Z, Jeffreys AJ. Clustering of hypervariable minisatellites in the proterminal regions of human autosomes. Genomics 1988; 3:352-60. [PMID: 3243550 DOI: 10.1016/0888-7543(88)90127-9] [Citation(s) in RCA: 222] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Six of the human minisatellites detected by DNA fingerprint probes have been localized by in situ hybridization to human metaphase chromosomes. These hypervariable loci are not dispersed at random in the human genome, but show preferential, though not exclusive, localization to terminal G-bands of human autosomes. Two of the proterminal minisatellites are very closely linked to other variable loci. Sequence analysis of one of these additional minisatellites suggests that the two linked minisatellites arose by independent amplification of different repeat units. The proterminal regions of human autosomes may therefore be rich in minisatellites, analogous to the pseudoautosomal terminal pairing region of human sex chromosomes that is similarly abundant in hypervariable minisatellites.
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37 |
222 |
18
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Ohara J, Paul WE. Receptors for B-cell stimulatory factor-1 expressed on cells of haematopoietic lineage. Nature 1987; 325:537-40. [PMID: 3100961 DOI: 10.1038/325537a0] [Citation(s) in RCA: 221] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
B-cell stimulatory factor-1 (BSF-1) is a T-cell product of relative molecular mass 20,000 (Mr, 20K) initially described as a cofactor required for DNA synthesis by resting mouse B cells stimulated with low concentrations of anti-IgM antibodies. It acts on resting B cells to enhance the expression of class II major histocompatibility complex (MHC) molecules, to prepare these cells to respond more promptly to subsequent stimuli, such as anti-IgM antibodies, and causes the secretion of IgG1 and IgE by B cells stimulated with lipopolysaccharide (LPS). BSF-1 has been shown to stimulate T cell lines, resting T cells and some mast cell lines. Recently, the designation interleukin-4 (IL-4) has been suggested for BSF-1. We report here the existence of high-affinity cell-surface receptors specific for BSF-1 on both B and T lymphocytes, and on cells of several other haematopoietic lineages, including mast cell, macrophage and undifferentiated haematopoietic cell lines. Resting B and T lymphocytes express receptors, which increase in number upon activation of B cells with LPS or anti-IgM, and of T cells with concanavalin A. Cross-linking of 125I-labelled-BSF-1 to its receptors creates a complex of Mr approximately 80,000.
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Comparative Study |
38 |
221 |
19
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Benveniste J, Le Couedic JP, Polonsky J, Tence M. Structural analysis of purified platelet-activating factor by lipases. Nature 1977; 269:170-1. [PMID: 909582 DOI: 10.1038/269170a0] [Citation(s) in RCA: 220] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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48 |
220 |
20
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Krontiris TG, DiMartino NA, Colb M, Parkinson DR. Unique allelic restriction fragments of the human Ha-ras locus in leukocyte and tumour DNAs of cancer patients. Nature 1985; 313:369-74. [PMID: 2578622 DOI: 10.1038/313369a0] [Citation(s) in RCA: 218] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
White blood cell DNA from cancer patients and DNA from tumours and tumour-derived cell lines frequently demonstrated allelic restriction fragments of the Harvey ras oncogene locus not found in the unaffected population. The presence of such unusual alleles may be linked to susceptibility to cancer.
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40 |
218 |
21
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Nonoyama M, Pagano JS. Detection of Epstein-Barr viral genome in nonproductive cells. NATURE: NEW BIOLOGY 1971; 233:103-6. [PMID: 4328798 DOI: 10.1038/newbio233103a0] [Citation(s) in RCA: 206] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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54 |
206 |
22
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Merigan TC, Sikora K, Breeden JH, Levy R, Rosenberg SA. Preliminary observations on the effect of human leukocyte interferon in non-Hodgkin's lymphoma. N Engl J Med 1978; 299:1449-53. [PMID: 362211 DOI: 10.1056/nejm197812282992608] [Citation(s) in RCA: 206] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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47 |
206 |
23
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Edmondson RP, Thomas RD, Hilton PJ, Patrick J, Jones NF. Abnormal leucocyte composition and sodium transport in essential hypertension. Lancet 1975; 1:1003-5. [PMID: 48673 DOI: 10.1016/s0140-6736(75)91947-9] [Citation(s) in RCA: 205] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Cation transport and electrolyte composition were studied in leucocytes from 17 patients with uncomplicated essential hypertension. Significant increases in cell sodium and water contents, associated with a depression of the rate-constant for active sodium efflux, were found in the hypertensive patients. These abnormalities in cell sodium transport may possibly be related to mechanisms of hypertension.
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50 |
205 |
24
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Fiszer-Szafarz B, Szafarz D, Guevara de Murillo A. A general, fast, and sensitive micromethod for DNA determination application to rat and mouse liver, rat hepatoma, human leukocytes, chicken fibroblasts, and yeast cells. Anal Biochem 1981; 110:165-70. [PMID: 7011093 DOI: 10.1016/0003-2697(81)90130-5] [Citation(s) in RCA: 198] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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44 |
198 |
25
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Tyers M, Rachubinski RA, Stewart MI, Varrichio AM, Shorr RG, Haslam RJ, Harley CB. Molecular cloning and expression of the major protein kinase C substrate of platelets. Nature 1988; 333:470-3. [PMID: 2897630 DOI: 10.1038/333470a0] [Citation(s) in RCA: 196] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In platelets, agonists that stimulate phosphoinositide turnover cause the rapid phosphorylation of a protein of apparent relative molecular mass (Mr) 40-47,000, called P47, by protein kinase C (PKC). Diverse identities have been ascribed to P47 including lipocortin, inositol 1,4,5-trisphosphate 5-phosphomonoesterase, pyruvate dehydrogenase alpha subunit and an actin regulatory protein. We have isolated human P47 clones by immunological screening of a lambda gt11 complementary DNA library from HL-60 cells, a human promyelocytic leukaemia cell line. P47 recombinants thus identified hybridized to a 3.0 kilobase (kb) messenger RNA in mature white blood cell lines; the same mRNA was induced in HL-60 cells during differentiation. A 1,050 base pair (bp) open reading frame that could encode a protein of Mr40,087 was confirmed by comparison with peptide sequences from platelet P47, and by expression of the putative recombinant P47 in E. coli and in vitro. The P47 sequence appears to have been conserved throughout vertebrate evolution, and is not similar to any other known sequence including human lipocortin and the alpha subunit of pyruvate dehydrogenase. The P47 protein contains a potential Ca2+-binding 'EF-hand' structure and a region that strongly resembles known PKC phosphorylation sites.
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37 |
196 |