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Query: UMLS:C0023418 (leukemia)
 93,477 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Schmidt-Ruppin Rous sarcoma virus infected chick cells injected into newborn C3H/f mice gave rise to tumours at the site of inoculation. These tumours were transplantable in adult C3H/f mice and were able to induce tumours in the wing of adult Leghorn chickens. Tumour cells from the 18th passage in mice were used to establish a cell line in tissue culture (C3HSR). These cells released C-type virus particles that produced foci and were able to propagate in chick cells. Cloning of the C3HSR cells demonstrated that the same cell expressed both avian and murine antigens. Mouse cells infected with virus released by C3HSR cells produced murine leukaemia virus-like particles as revealed by the reverse XC syncytial test and by immunofluorescence tests.
J Gen Virol 1978 Jul
PMID:Simultaneous production of mouse endogenous virus and Rous sarcoma virus by Schmidt-Ruppin virus infected mouse cells. 21 Nov 79

The RNA components of two C-type RNA viruses, avian myeloblastosis virus and Friend leukaemia virus, have been isolated by treatment of the viruses with 6 M-guanidine-HCl and precipitation with ethanol. The virus proteins were recovered by lyophilization of the guanidine-HCl-ethanol supernatant after thorough dialysis against 0.5 mM-dithiothreitol. This simple method yielded RNA of similar quality to the phenol and sodium dodecyl sulphate (SDS) extraction methods, and the same amount of 60-70S RNA, although a fraction of the smaller (4S) species remained in the protein fraction. The sedimentation patterns of heat-denatured RNA extracted by either method were similar. Electrophoretic analyses of the extracted proteins in polyacrylamide gel gradients containing SDS gave patterns that were very similar to those obtained by direct analysis of SDS disrupted viruses.
J Gen Virol 1978 Jul
PMID:The use of guanidine-HCl for the isolation of both RNA and protein from RNA tumour viruses. 21 Nov 81

The neutralization of feline leukaemia virus could be enhanced by performing the reaction in hypotonic medium. Absorption of antibody by virus specific antigens was also made more sensitive under these conditions.
J Gen Virol 1978 Aug
PMID:Potentiation of the neurtalization of feline leukaemia virus in hypotonic medium. 21 Nov 86

The OK 10 virus complex was isolated from a liver tumour of a chicken which, as an embryo, had been inoculated intravenously with a field isolate of an avian leukosis virus. The OK 10 virus complex contains at least two viruses: the interference assay and serum neutralization test indicate that the helper virus belongs to subgroup A. One of the viruses, OK 10 V, induces distinct foci in chick embryo cells under agar overlay and cells from the foci form colonies in soft agar. These properties allow in vitro assay of the virus. Injection of virus or infected cells into chicks induces acute leukaemia but no local tumours. Another virus, OK 10 AV (associated virus), comprises about 99% of the OK 10 complex. The virus does not induce foci in chick embryo cells. In chickens it causes leukosis 17 months after injection. Electron micrographs of OK 10 virus stocks show typical C type virus particles. These particles have a density of 1.16 g/ml and contain 70S RNA which, after heat denaturation, releases type b RNA subunits. The OK 10 virus complex apparently represents a strain of acute leukaemia viruses.
J Gen Virol 1978 Sep
PMID:OK 10 virus, an avian retrovirus resembling the acute leukaemia viruses. 21 Nov 98

NIH 3T3 mouse cells were infected at very high multiplicity with murine sarcoma/leukaemia virus (MSV/MLV) and then cloned. All of the 48 clones obtained were morphologically transformed, all but one showed anchorage-independence of growth, typical of MSV-transformed NIH 3T3 cells and most (91%) produced MSV/MLV. When cells which had been pre-treated with 10(4) units/ml of purified interferon (IF) were infected under the same conditions and then cloned in the presence of the same amount of IF, only 6 of a total of 63 clones were morphologically transformed. All but these 6 showed a degree of anchorage-independence typical of the uninfected parental cells and very few (2.4%) produced virus. Furthermore, the MSV genome could not be rescued in any of the 23 clones tested and only 1 out of 10 clones produced tumours. The properties of these clones remained stable over a period of 10 to 20 passages in the absence of interferon. We conclude that interferon can irreversibly block an early step in the MSV/MLV infectious process.
J Gen Virol 1979 Apr
PMID:An interferon-sensitive early step in the establishment of infection of murine cells by murine sarcoma/leukaemia virus. 22 16

The virus-specific nucleotide sequences in the RNA and DNA of a Kirsten mouse sarcoma virus (Ki-MSV)-transformed non-producer human osteosarcoma cell clone and two subclones of these cells that reverted to a normal phenotype have been analysed by hybridization of sarcoma virus-specific complementary DNA (cDNA) to cellular RNA or DNA. Whereas the transformed clone had acquired de novo Ki-MSV sequences in the RNA and DNA of the cells, both the revertant cell lines seemed to have lost most or all of this information from the cellular nucleic acids. The DNA from the revertant cells lacked the sequences represented either in the Ki-MSV-specific cDNA or in the total cDNA of the leukaemia-sarcoma virus complex. Thus, the reversion of the virus-transformed human cells to normal morphology is associated with the loss of most or all of the proviral sequences from the cellular DNA.
J Gen Virol 1979 May
PMID:Reversion of Kirsten sarcoma virus transformed human cells: elimination of the sarcoma virus nucleotide sequences. 22 28

In vitro interactions between murine cytomegalovirus (MCMV) and murine leukaemia viruses (MuLV), two groups of enveloped viruses capable of causing persistent or latent infections in vivo, were examined for evidence of phenotypic mixing. The growth of MCMV in murine cells productively infected with ecotropic MuLV was shown to result regularly in the production of phenotypically mixed particles having the envelope antigens of MuLV and the genome of MCMV [MCMV(MuLV) pseudotypes]. The identity of such pseudotype particles was confirmed by the use of specific anti-MuLV serum and by the demonstration of restriction due to viral interference of penetration of these particles on MuLV-infected murine cells. This restriction was independent of N- or B-tropism. The production of reverse pseudotypes could not be examined because of the lytic effects of MCMV on the requisite assay cells.
J Gen Virol 1979 Jun
PMID:Phenotypic mixing between murine oncoviruses and murine cytomegalovirus. 22 36

A comparative study of the expression of retrovirus-associated 8S RNA was made in different mammalian cells. This RNA is found in cultured cells from all mammalian species analysed but its expression varies. An increase of 8S RNA is observed in sarcoma virus-transformed cells as compared to control uninfected cells or cells infected with leukaemia virus. No increased quantities of 8S RNA were detected in cells transformed by SV40 or by methylcholanthrene. These data show that the level of 8S RNA was augmented following transformation by sarcoma viruses.
J Gen Virol 1979 Jul
PMID:Expression of retrovirus-associated 8S RNA in mammalian cells. 22 90

In cultures of Ly cells treated with 10 or 30 reference units/ml of mouse interferon there was a 30 to 200 times reduction in the production of infectious vesicular stomatitis virus (VSV); virus particle production, as measured by VSV particle associated virus RNA, virus protein, and virus transcriptase, was inhibited by, at most, six times. These results suggested that interferon-treated cells produce VSV particles with low infectivity and resemble the findings in interferon-treated cells infected with murine leukaemia viruses.
J Gen Virol 1979 Jul
PMID:Production of vesicular stomatitis virus with low infectivity by interferon-treated cells. 22 98

The proteins of Rauscher murine leukaemia virus (R-MuLV) were characterized by amino acid analyses and by determination of their mol. wt. by gel filtration on cross-linked Sepharose 6B in 6M-guanidine hydrochloride (GuHCl). Molecular weights of 56,000, 29,000, 15,000, 10,500 and 7,600 were found for gp70, p30, p15, p12 and p10 respectively. The amino acid compositions of these proteins and of p12E have been determined. The amino acid compositions of the p10 polypeptides of Rauscher-MuLV and Moloney-MuLV are very similar as are those of the p30 polypeptides, whereas the amino acid compositions of the p12 polypeptides differ considerably. P12E contains the highest percentage of hydrophobic amino acid residues. Among the gag-gene coded proteins, p15 contains the highest percentage of hydrophobic amino acid residues while p12 and p10 contain the lowest.
J Gen Virol 1979 Feb
PMID:Chemical characterization of Rauscher leukaemia virus proteins. 42 56


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