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Koenig E, Westermann H, Jäger K, Sell G, Bechert K, Fetter M, Dichgans J. A new multiaxis rotating chair for oculomotor and vestibular function testing in humans. Neuroophthalmology 2009. [DOI: 10.3109/01658109609009676] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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27
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Högbom M, Jäger K, Robel I, Unge T, Rohayem J. The active form of the norovirus RNA-dependent RNA polymerase is a homodimer with cooperative activity. J Gen Virol 2009; 90:281-291. [PMID: 19141436 DOI: 10.1099/vir.0.005629-0] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Norovirus (NV) is a leading cause of gastroenteritis worldwide and a major public health concern. So far, the replication strategy of NV remains poorly understood, mainly because of the lack of a cell system to cultivate the virus. In this study, the function and the structure of a key viral enzyme of replication, the RNA-dependent RNA polymerase (RdRp, NS7), was examined. The overall structure of the NV NS7 RdRp was determined by X-ray crystallography to a 2.3 A (0.23 nm) resolution (PDB ID 2B43), displaying a right-hand fold typical of the template-dependent polynucleotide polymerases. Biochemical analysis evidenced that NV NS7 RdRp is active as a homodimer, with an apparent K(d) of 0.649 microM and a positive cooperativity (Hill coefficient n(H)=1.86). Crystals of the NV NS7 homodimer displayed lattices containing dimeric arrangements with high shape complementarity statistics. This experimental data on the structure and function of the NV RdRp may set the cornerstone for the development of polymerase inhibitors to control the infection with NV, a medically relevant pathogen.
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Bräuer L, Kindler C, Jäger K, Sel S, Pleyer U, Paulsen F. Okuläre Surfactant-Proteine. Klin Monbl Augenheilkd 2008. [DOI: 10.1055/s-0028-1104721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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29
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Tiemann U, Brüssow KP, Dannenberger D, Jonas L, Pöhland R, Jäger K, Dänicke S, Hagemann E. The effect of feeding a diet naturally contaminated with deoxynivalenol (DON) and zearalenone (ZON) on the spleen and liver of sow and fetus from day 35 to 70 of gestation. Toxicol Lett 2008; 179:113-7. [DOI: 10.1016/j.toxlet.2008.04.016] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2008] [Revised: 04/16/2008] [Accepted: 04/16/2008] [Indexed: 10/22/2022]
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30
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Tiemann U, Brüssow KP, Küchenmeister U, Jonas L, Pöhland R, Reischauer A, Jäger K, Dänicke S. Changes in the spleen and liver of pregnant sows and full-term piglets after feeding diets naturally contaminated with deoxynivalenol and zearalenone. Vet J 2008; 176:188-96. [PMID: 17434324 DOI: 10.1016/j.tvjl.2007.02.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2006] [Revised: 11/21/2006] [Accepted: 02/24/2007] [Indexed: 01/06/2023]
Abstract
Wheat contaminated naturally with the Fusarium toxins deoxynivalenol (DON) and zearalenone (ZON) was fed to pregnant Landrace sows for 35days. On day 110, caesarean section was carried out, the offspring were killed immediately after birth, and their livers and spleens examined. At necropsy there were no macroscopic lesions observed in any organ of either sows or piglets. Histopathological evaluation of tissues from sows of the treated group revealed changes in liver and spleen tissues, whereas no significant changes were observed in these tissues in their piglets. Liver damage, as measured by prominent elevated transaminase activities, was not detected in the serum of the sows. In pregnant sows there were individual variations in sensitivity to the Fusarium toxins. In conclusion, it can be assumed that there are no adverse effects on the liver and spleen of full-term piglets when their mothers consumed diets containing up to 9570 and 358mug DON/ZON per kg diet.
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Claudon M, Cosgrove D, Albrecht T, Bolondi L, Bosio M, Calliada F, Correas JM, Darge K, Dietrich C, D'Onofrio M, Evans DH, Filice C, Greiner L, Jäger K, Jong ND, Leen E, Lencioni R, Lindsell D, Martegani A, Meairs S, Nolsøe C, Piscaglia F, Ricci P, Seidel G, Skjoldbye B, Solbiati L, Thorelius L, Tranquart F, Weskott HP, Whittingham T. Guidelines and good clinical practice recommendations for contrast enhanced ultrasound (CEUS) - update 2008. ULTRASCHALL IN DER MEDIZIN (STUTTGART, GERMANY : 1980) 2008; 29:28-44. [PMID: 18270887 DOI: 10.1055/s-2007-963785] [Citation(s) in RCA: 483] [Impact Index Per Article: 30.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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32
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Jäger K, Schoon HA, Ellenberger C, Bartmann CP, Rass J, Bazer FW, Klug J, Allen WR, Hoppen HO, Hoffmann C. Histopathological and immunohistochemical findings during the sexual cycle in female mules and effects of long-term Regumate® administration. PFERDEHEILKUNDE 2008. [DOI: 10.21836/pem20080110] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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33
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Rohayem J, Jäger K, Robel I, Scheffler U, Temme A, Rudolph W. Characterization of norovirus 3Dpol RNA-dependent RNA polymerase activity and initiation of RNA synthesis. J Gen Virol 2006; 87:2621-2630. [PMID: 16894201 DOI: 10.1099/vir.0.81802-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Norovirus (NV) 3Dpol is a non-structural protein predicted to play an essential role in the replication of the NV genome. In this study, the characteristics of NV 3Dpol activity and initiation of RNA synthesis have been examined in vitro. Recombinant NV 3Dpol, as well as a 3Dpol active-site mutant were expressed in Escherichia coli and purified. NV 3Dpol was able to synthesize RNA in vitro and displayed flexibility with respect to the use of Mg2+ or Mn2+ as a cofactor. NV 3Dpol yielded two different products when incubated with synthetic RNA in vitro: (i) a double-stranded RNA consisting of two single strands of opposite polarity or (ii) the single-stranded RNA template labelled at its 3′ terminus by terminal transferase activity. Initiation of RNA synthesis occurred de novo rather than by back-priming, as evidenced by the fact that the two strands of the double-stranded RNA product could be separated, and by dissociation in time-course analysis of terminal transferase and RNA synthesis activities. In addition, RNA synthesis was not affected by blocking of the 3′ terminus of the RNA template by a chain terminator, sustaining de novo initiation of RNA synthesis. NV 3Dpol displays in vitro properties characteristic of RNA-dependent RNA polymerases, allowing the implementation of this in vitro enzymic assay for the development and validation of antiviral drugs against NV, a so far non-cultivated virus and an important human pathogen.
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Rohayem J, Robel I, Jäger K, Scheffler U, Rudolph W. Protein-primed and de novo initiation of RNA synthesis by norovirus 3Dpol. J Virol 2006; 80:7060-9. [PMID: 16809311 PMCID: PMC1489054 DOI: 10.1128/jvi.02195-05] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2005] [Accepted: 04/21/2006] [Indexed: 01/07/2023] Open
Abstract
Noroviruses (Caliciviridae) are RNA viruses with a single-stranded, positive-oriented polyadenylated genome. To date, little is known about the replication strategy of norovirus, a so-far noncultivable virus. We have examined the initiation of replication of the norovirus genome in vitro, using the active norovirus RNA-dependent RNA polymerase (3D(pol)), homopolymeric templates, and synthetic subgenomic or antisubgenomic RNA. Initiation of RNA synthesis on homopolymeric templates as well as replication of subgenomic polyadenylated RNA was strictly primer dependent. In this context and as observed for other enteric RNA viruses, i.e., poliovirus, a protein-primed initiation of RNA synthesis after elongation of the VPg by norovirus 3D(pol) was postulated. To address this question, norovirus VPg was expressed in Escherichia coli and purified. Incubation of VPg with norovirus 3D(pol) generated VPg-poly(U), which primed the replication of subgenomic polyadenylated RNA. In contrast, replication of antisubgenomic RNA was not primer dependent, nor did it depend on a leader sequence, as evidenced by deletion analysis of the 3' termini of subgenomic and antisubgenomic RNA. On nonpolyadenylated RNA, i.e., antisubgenomic RNA, norovirus 3D(pol) initiated RNA synthesis de novo and terminated RNA synthesis by a poly(C) stretch. Interestingly, on poly(C) RNA templates, norovirus 3D(pol) initiated RNA synthesis de novo in the presence of high concentrations of GTP. We propose a novel model for initiation of replication of the norovirus genome by 3D(pol), with a VPg-protein-primed initiation of replication of polyadenylated genomic RNA and a de novo initiation of replication of antigenomic RNA.
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Reischauer A, Grosche A, Gieseler T, Jäger K, Huth H, Schoon HA. Main symptom “chronic blood loss” in two horses with haemangiosarcoma. PFERDEHEILKUNDE 2006. [DOI: 10.21836/pem20060204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Sirocko F, Seelos K, Schaber K, Rein B, Dreher F, Diehl M, Lehne R, Jäger K, Krbetschek M, Degering D. A late Eemian aridity pulse in central Europe during the last glacial inception. Nature 2005; 436:833-6. [PMID: 16094365 DOI: 10.1038/nature03905] [Citation(s) in RCA: 118] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2005] [Accepted: 06/10/2005] [Indexed: 11/08/2022]
Abstract
Investigating the processes that led to the end of the last interglacial period is relevant for understanding how our ongoing interglacial will end, which has been a matter of much debate (see, for example, refs 1, 2). A recent ice core from Greenland demonstrates climate cooling from 122,000 years ago driven by orbitally controlled insolation, with glacial inception at 118,000 years ago. Here we present an annually resolved, layer-counted record of varve thickness, quartz grain size and pollen assemblages from a maar lake in the Eifel (Germany), which documents a late Eemian aridity pulse lasting 468 years with dust storms, aridity, bushfire and a decline of thermophilous trees at the time of glacial inception. We interpret the decrease in both precipitation and temperature as an indication of a close link of this extreme climate event to a sudden southward shift of the position of the North Atlantic drift, the ocean current that brings warm surface waters to the northern European region. The late Eemian aridity pulse occurred at a 65 degrees N July insolation of 416 W m(-2), close to today's value of 428 W m(-2) (ref. 9), and may therefore be relevant for the interpretation of present-day climate variability.
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Jäger K, Ördög V, Barnabás B. Effect of cyanobacterial and microalgal biomass on anther culture response of wheat (Triticum aestivum L.). ACTA ACUST UNITED AC 2005. [DOI: 10.1556/aagr.53.2005.1.12] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In the present work the effect of microalgal and cyanobacterial biomass on anther cultures of wheat (Triticum aestivum L.) was studied. Investigations were made on the influence of media supplemented with a biomass of four terrestrial and fresh-water microalgal and cyanobacterial strains (1-2 g l-1) on the androgenic response, frequency of microspore-derived embryo-like structures, and their regeneration capacity in anther cultures of wheat. The addition of 1 g L-1 of cyanobacterium biomass MACC 643 to the induction and regeneration media significantly improved the androgenic response by 50% in the genotype Mv Pálma, and reduced the requirement for the synthetic auxin 2,4-D.
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Albrecht T, Blomley M, Bolondi L, Claudon M, Correas JM, Cosgrove D, Greiner L, Jäger K, Jong ND, Leen E, Lencioni R, Lindsell D, Martegani A, Solbiati L, Thorelius L, Tranquart F, Weskott HP, Whittingham T. Guidelines for the use of contrast agents in ultrasound. January 2004. ULTRASCHALL IN DER MEDIZIN (STUTTGART, GERMANY : 1980) 2004; 25:249-56. [PMID: 15300497 DOI: 10.1055/s-2004-813245] [Citation(s) in RCA: 211] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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39
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Jäger K. [Levels of training in diagnostic ultrasound]. ULTRASCHALL IN DER MEDIZIN (STUTTGART, GERMANY : 1980) 2002; 23:299-301. [PMID: 12400019 DOI: 10.1055/s-2002-35055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
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40
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Zhu J, Jäger K, Black T, Zarka K, Koksharova O, Wolk CP. HcwA, an autolysin, is required for heterocyst maturation in Anabaena sp. strain PCC 7120. J Bacteriol 2001; 183:6841-51. [PMID: 11698373 PMCID: PMC95525 DOI: 10.1128/jb.183.23.6841-6851.2001] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In many filamentous cyanobacteria, vegetative cells can differentiate into heterocysts, cells that are specialized for aerobic fixation of N(2). Synthesis of the heterocyst envelope polysaccharide is dependent on the gene hepA in Anabaena sp. strain PCC 7120. In search of genes that are involved in the regulation of hepA, we transposon mutagenized strain DR1069, which bears a chromosomal hepA::luxAB fusion. One resulting mutant, designated HNL3, grows normally in medium with nitrate and shows poor induction of hepA in response to nitrogen deprivation. In HNL3, transposon Tn5-1058 is inserted within gene hcwA, a constitutively expressed open reading frame whose predicted product resembles N-acetylmuramoyl-L-alanine amidases. Reconstruction of the mutation confirmed that the mutant phenotype resulted from the insertion of the transposon. The induction of hepA in HNL3 is partially restored upon recombination of HNL3 with plasmid-borne, wild-type hcwA. Moreover, HcwA expressed in Escherichia coli exhibits wall-lytic activity. These results suggest that the degradation, or possibly reconstruction, of the cell peptidoglycan layer is a prerequisite for heterocyst maturation.
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Jäger K, Wirz J. [A new cone titanium magnet insert in hybrid prosthetics]. SCHWEIZER MONATSSCHRIFT FUR ZAHNMEDIZIN = REVUE MENSUELLE SUISSE D'ODONTO-STOMATOLOGIE = RIVISTA MENSILE SVIZZERA DI ODONTOLOGIA E STOMATOLOGIA 2001; 110:1160-70. [PMID: 11143185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
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42
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Loehrer FM, Tschöpl M, Angst CP, Litynski P, Jäger K, Fowler B, Haefeli WE. Disturbed ratio of erythrocyte and plasma S-adenosylmethionine/S-adenosylhomocysteine in peripheral arterial occlusive disease. Atherosclerosis 2001; 154:147-54. [PMID: 11137094 DOI: 10.1016/s0021-9150(00)00449-4] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Altered homocysteine metabolism associated with peripheral arterial occlusive disease (PAOD) may lead to impairment of vital methylation reactions through accumulation of S-adenosylhomocysteine (AdoHcy) as well as through alteration of the ratio S-adenosylmethionine (AdoMet)/AdoHcy. We determined AdoMet, AdoHcy, their ratio, and homocysteine in plasma as well as AdoMet, AdoHcy, and their ratio in erythrocytes of 61 patients with PAOD (age 49-93) and 50 healthy controls (age 41-87). Geometric mean values of plasma homocysteine, AdoMet, and AdoHcy were significantly increased in patients compared with controls (15.5 vs. 10.4 micromol/l**; 107 vs. 52.3* nmol/l; 55. 0 vs. 23.1** nmol/l, respectively; *P<0.01, **P<0.001), while the ratio of AdoMet/AdoHcy was decreased in patients (1.92 vs. 2.52*). In erythrocytes patients exhibited increased levels of AdoHcy compared with controls (309 vs. 205 nmol/l**) whereas AdoMet (3351 vs. 3732 nmol/l*) and the ratio of AdoMet/AdoHcy (11.8 vs. 19.1**) were decreased. The odds ratio (OR) for developing PAOD with decreased AdoMet/AdoHcy ratio after adjustment for kidney function was significant for erythrocyte levels < or =14.2 (OR, 7.1 (6.9-7.2, 95% CI). In addition, hematocrit levels were found to be significantly decreased in patients versus controls (0.35 vs. 0.42 l/l**) and were significantly correlated with the ratio of AdoMet/AdoHcy in erythrocytes of the patients. Since the ratio of AdoMet/AdoHcy is closely linked with the activity of numerous enzymatic methylation reactions, these results suggest that methylation may be impaired in these patients.
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Loss M, Przemeck M, Schmidtko J, Kunz R, Jalali A, Arends H, Lorenz R, Rensing S, Kaup FJ, Jäger K, White DJ, Klempnauer J, Winkler M. Factors determining the onset of hyperacute rejection following discordant porcine-to-cynomolgus monkey kidney xenotransplantation. Transplant Proc 2000; 32:1098. [PMID: 10936375 DOI: 10.1016/s0041-1345(00)01140-4] [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: 10/17/2022]
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44
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Loss M, Przemeck M, Schmidtko J, Arends H, Kunz R, Jäger K, Jalali A, Rensing S, Kaup J, Cozzi E, White DJ, Klempnauer J, Winkler M. Long-term survival of cynomolgus monkeys following pig-to-primate kidney xenotransplantation using h-DAF transgenic donor organs. Transplant Proc 2000; 32:1095-6. [PMID: 10936373 DOI: 10.1016/s0041-1345(00)01138-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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45
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Elsasser S, Solèr M, Bolliger C, Jäger K, Steiger U, Perruchoud AP. Takayasu disease with predominant pulmonary involvement. Respiration 2000; 67:213-5. [PMID: 10773797 DOI: 10.1159/000029490] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
We report a case of Takayasu's arteritis with predominant pulmonary involvement, which led eventually to complete obliteration of the right pulmonary artery. Subsequently, cavitation and chronic inflammation developed in the nonperfused right lung. A right pneumonectomy was performed to control the infectious process, leading to functional improvement and better control of the underlying immunologic disorder.
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Schmeling-Kludas C, Jäger K, Niemann BM. [Diagnosis and significance of psychiatric disorders in physically ill geriatric patients]. Z Gerontol Geriatr 2000; 33:36-43. [PMID: 10768256 DOI: 10.1007/s003910050005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Psychic disorders were studied with a naturalistic design in 125 consecutive patients of a medical-geriatric department in a general hospital. Based on the clinical examination and the values of the Mini-Mental-State-Examination (2), 51 patients were classified as unable for diagnostic procedures concerning psychic state. The other 74 patients underwent these diagnostic procedures including clinical investigation and three screening-scales (Geriatric Depression Scale (11); Hospital Anxiety and Depression-Scale (4)). If these examinations led to the suspicion that a patient suffered from a psychic disorder, an interview was performed by a psychotherapist with experience in gerontopsychosomatic treatment and information was collected from the medical and nursing staff. Dementia was detected or excluded by neuropsychological tests. Psychic disorders were found in 41 patients, mostly adaptation disorders and depressions. In more than half of the patients, the disorder was estimated to be relevant for the whole hospital therapy. The screening instruments turned out to be reliable, so they can be recommended for further use. Difficult to answer remains the question, how the treatment of the psychic disorders--in our sample necessary for each 5th to 6th patient--can be implemented in a medical-geriatric department.
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Jeanneret C, Aschwanden M, Labs KH, Jäger K. Duplex ultrasound for the assessment of venous reflux. CURRENT PROBLEMS IN DERMATOLOGY 1999; 27:96-101. [PMID: 10547732 DOI: 10.1159/000060614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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48
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Dirks W, MacLeod RA, Jäger K, Milch H, Drexler HG. First searchable database for DNA profiles of human cell lines: sequential use of fingerprint techniques for authentication. Cell Mol Biol (Noisy-le-grand) 1999; 45:841-53. [PMID: 10541480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
The authenticity and freedom from cross-contaminants of a cell line are important prerequisites for any research, development or production programs involving cell lines. Mini- and microsatellites in the human genome harboring variable-numbers of tandem repeat (VNTR) DNA markers allow individualization at the DNA level and are of practical value for genetic linkage mapping, forensic legal medicine, paternity testing, monitoring of bone marrow transplants, and individualization of established cell lines. We have validated fingerprint techniques of different single- and multiple-locus VNTRs enabling the establishment of a searchable database of DNA profiles. As a result, multiplexed polymerase chain reaction amplification fragment length polymorphism (AmpFLP) of four prominent and highly polymorphic minisatellite VNTR loci was proven as the best tool for screening the uniqueness of DNA profiles in a fingerprint database. In order to avoid false positivity, identical or similar DNA profiles based on AmpFLP VNTR were tested further using a multi-locus fingerprint system. Our data demonstrate that misidentification remains a chronic problem among human continuous cell lines (detailed information at URL http://www.dsmz.de). The combination of rapidly generated DNA profiles based on single-locus VNTR loci, their authentication by screening the fingerprint database, and confirmation of duplicate banding patterns using multilocus fingerprints constitute a highly reliable and robust method, which enables high fidelity and quality of maintenance independent from the quantity of individual cell lines.
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Dirks W, Rome D, Ringel F, Jäger K, MacLeod RA, Drexler HG. Expression of the growth arrest-specific gene 6 (GAS6) in leukemia and lymphoma cell lines. Leuk Res 1999; 23:643-51. [PMID: 10400186 DOI: 10.1016/s0145-2126(99)00075-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The initial identification of GAS6 as a protein expressed in response to growth arrest suggested that it might function as a negative regulator of cell proliferation. Since the transforming activity of the GAS6 receptor (AXL/UFO) was documented, GAS6 might stimulate rather than inhibit proliferation. In order to detect aberrant expression of GAS6 we examined gene expression in 46 cell lines of precursor B-, B- and T-cell origin as well as from Hodgkin's disease and cell lines established from various myeloproliferative disorders. In our study, the expression of GAS6 reveals a constitutive transcriptional activation in 8/46 cases of proliferating cell lines. The GAS6 mRNA expression could be shown in 4/22 cell lines of the lymphoid arm and in 4/17 of the myeloid lineages of the hematopoietic system. No transcripts could be detected in the CD30+ Hodgkin and anaplastic large cell lymphomas (0/7). Interestingly, the steady state mRNA levels showed neglectable GAS6 expression in precursor B and B-cell lines (1/9), but could be detected in terminally differentiated plasma cell lines (4/4). The predominantly GAS6-expressing cell lines of non-lymphoid origin have been established from acute myeloid leukemias of the M4 subtype (3/4). In order to demonstrate evidence for an autocrine regulation of growth in permanent hematopoietic cell lines, we measured the GAS6 expression in cell lines with strong positivity for the AXL/UFO receptor mRNA. Constitutive basal levels of GAS6 mRNA and protein expression could be only detected in 3/23 AXL/UFO expressing cell lines. Although a general mechanism seems most unlikely, further studies are necessary to demonstrate the involvement of GAS6 in single cases of disordered growth or chemotaxis/adhesion of leukemia and lymphomas.
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Jäger K. 6. Tagung der dvs-Kommission „Frauenforschung in der Sportwissenschaft“. GERMAN JOURNAL OF EXERCISE AND SPORT RESEARCH 1999. [DOI: 10.1007/bf03176529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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