[Cytogenic characteristics and virogenic status of lymphoid cells from malignant baboon lymphomas]. / Tsitogeneticheskaia kharakteristika i virogennyi status limfoidnykh kletok iz zlokachestvennykh limfom pavianov.

Four lymphoid cell cultures obtained from Papio hamadryads with malignant lymphomas were studied. The cultured cells produced two lymphotropic EBV-like herpes virus of Papio (HVP) and T-lymphotropic monkey retrovirus STLV-1 (HTLV-1 family) or HVP alone. More than 100 subcultured cell lines were shown to remain mixed B- and T-cellular, the levels of T cells of different subpopulations were 15-50%. Cytogenetic investigations showed that one of the 4 cultures was tumorogenic and the others were derived from the normal cells of monkeys with malignant lymphomas. It is suggested that the presence of a cultural virus (viruses) may affect the karyotypes of cells.

[The cytogenetic characteristics of human B-lymphoblastoid cell lines]. / Tsitogeneticheskaia kharakteristika B-limfoblastoidnykh kletochnykh linii cheloveka.

Permanent suspension B-cell lines HSL-1, HSL-2, HSL-3, HSL-4, HSL-5, HSL-8, HSL-9 have been obtained spontaneously from lymphocytes and cells of hematopoietic tissues of patients with various forms of leukemia and tumours. All cell lines contained Epstein-Barr virus (EBV). At early stages of cultivation (6-39th passages) normal karyotypes were established for all the tested lines which testified their origin from normal B-lymphocytes. In the process of cultivation of HSL-1 cell line, which (up to the 63rd passage) contained primarily the normal karyotypes, a substitution for tetraploid ones (92, XX, YY) by the 132nd passage was established. In line HSL-4, a pathological clone of cells with structural chromosome rearrangements (46, XY, -2, -12, der (12) t (2; 12) (p12, p13); del2 (p12), was revealed at the 26th passage. During a prolonged cultivation (up to the 130th passage) this abnormal clone forced out completely the clone with normal karyotype. Substitution of normal clone cells by cells with pathological karyotypes may point to their selective advantage.

[The cytogenetic characteristics of B-lymphoid lines from Papio hamadryas baboons and Macaca arctoides brown macaques]. / Tsitogeneticheskaia kharakteristika B-limfoidnykh linii pavianov gamadrilov Papio hamadryas i makakov burykh Macaca arctoides.

A cytogenetic analysis of 9 permanent suspension cell lines was performed. Cell lines were obtained from Papio hamadryas and Macaca arctoides cells by different methods. Five cell lines originated from non-malignant parental cells. Lines SPG-5 and SPG-6 were analysed at early stages of cultivation, with normal karyotypes being identified. In cell lines PL-11, MAL-1 and MAL-4 pathological clones with structural and numerical chromosomal rearrangements appeared only following a long-term cultivation. This phenomenon may be due presumably to the influence of cultivation on karyotype variability. In cell line LUG-4 chromosome marker 17p+ was found at early stages of cultivation. In sublines E9-1, E1-1 and E5-1, established from line LUG-4 by cloning, 17p+ chromosomal marker was found persisting. The presence of the marker 17p+ in all the cells at early passages testifies that the cell material from Papio with lymphoma, which was used for this line, might have the same chromosomal damage in its initial karyotype.

[The isolation and characteristics of continuous virus-producing lymphoid suspension cultures of African green monkey cells]. / Poluchenie i kharakteristika perevivaemykh virusprodutsiruiushchikh limfoidnykh suspenzionnykh kul'tur kletok afrikanskikh zelenykh martyshek.

Five continuous lymphoid suspension cell cultures were established by cultivation of lymphocytes from African green monkeys. The immunological typing revealed the mixed pattern of cultures consisting of B and T cell types. Two types of viruses: herpesvirus and retrovirus C-type were demonstrated by electron microscopy. Indirect immunofluorescence and molecular hybridization studies showed one of the viruses to be an EBV-related herpesvirus of green monkeys designated HVGM and the other to belong to H (S) TLV-1 group.

[Comparative analysis of genomes of oncogenic B-lymphotropic herpesviruses reproducing in cell lines obtained from different monkey species]. / Sravnitel'nyi analiz genomov onkogennykh B-limfotropnykh virusov gerpesa, reprodutsiruiushchikhsia v kletochnykh liniiakh, poluchennykh ot obez'ian razlichnykh vidov.

The aim of this work was to study genomes of B-lymphotropic oncogenic herpesviruses of Macaca arctoides (HVMA), Papio hamadryas (HVP) and Cercopithecus aethiops (HVGM). Blot-hybridization detected inter- and intraspecific genome heterogeneity of investigated viruses in restriction sites EcoR1, Pst1 and Hind111. Virus-specific sequences in two-cell lines obtained from HVMA-induced rabbit tumours can prove HVMA a role in malignant tumour induction in rabbits.

[Analysis of B-lymphotropic oncogenic herpesvirus of Macaca arctoides]. / Analiz B-limfotropnogo onkogennogo virusa gerpesa makakov burykh.

Some physico-chemical and molecular-biological parameters of B-lymphotropic herpes virus of Macaca arctoides (HVMA) have been analyzed. The buoyant density of virions and nucleocapsids in a gradient of the percoll density is 1.10 and 1.14 g/ml, respectively, while that of DNA in CsCl gradient is 1.717 g/ml, which is typical for herpes viruses of primates. At the same time the homology of DNA HVMA with DNA EBV and DNA HVP is 30-45%. Differences in restrictions sites between DNA HVMA, DNA HVP and DNA EBV are determined. The intraspecific heterogeneity of HVMA strains has been detected according to restriction sites of DNA. The HVMA genome size is about 170 kb. The DNA HVMA is colinear to the EBV genome, which is also typical of B-lymphotropic herpes viruses of primates.

[Malignant lymphoma in rabbits induced by the administration of herpes virus-containing material from brown macaques]. / Zlokachestvennye limfomy u krolikov, vyzvannye vvedeniem materiala, soderzhashchego virus gerpesa burykh makakov.

Oncogenicity for rabbits of lymphotropic herpesvirus of M. arctoides (HVMA) isolated by us earlier from lymphoid cells of lines MAL-1-3 has been shown in the course of studies. Inoculation of animals both with HVMA-containing cells and cell-free virus caused the development of generalized malignant lymphomas of prolymphocytic-lymphoblastic character leading the animals to death. The molecular hybridization method permitted revealing DNA sequences related to the DNAs of B-lymphotropic herpesviruses of primates in the cells of HVMA-containing cultures, primarily-induced tumours, and in a cell line established from rabbit tumour. This fact is indicative of etiological role of HVMA in the development of malignant lymphomas in rabbits. The question about the origin of the C type particles found in MAL-1-3 and OK-1 cells remains open.

[Modelling of malignant lymphoma in rabbits using primate oncogenic viruses. Preliminary report]. / Modelirovanie zlokachestvennoi limfomy na krolikakh s pomoshch'iu onkogennykh virusov primatov. Predvaritel'noe soobshchenie.

Inoculation of rabbits with permanent B-cell line cultures obtained from Stumptailed Macaques M. arctoides (MAL) which contain lymphotropic herpesvirus and C-type particles has led to the development of generalized lymphomas. The lymphoma cells had rabbit karyotype and did not contain surface an cytoplasmic immunoglobulins. Permanent suspension of lymphoid cell line independent of growth factors was obtained from rabbit lymphoma. The serum of a rabbit with lymphoma transmitted from another rabbit with MAL-induced lymphoma did not react with virus-negative human Raji cells when tested in immunofluorescence. But this serum reacted positively with cytoplasmic antigens of simian 594S-F9 cells (producing lymphotropic herpesvirus and two types of retroviruses, namely, endogenous C-type and HTLV-I-like) and human C91-PL cells (producing HTLV-I). The results obtained demonstrated high oncogenicity of the viruses produced by simian permanent cellular MAL lines for rabbits.

[Morphology of the surface of normal and virus transformed cells in vitro]. / Morfologiia poverkhnosti normal'nykh i transformirovannykh virusom kletok in vitro.

The cell surface morphology of two cell lines--from the mink lung (Mv1Lu) and from the Kirsten sarcoma virus transformed derivate (Ki-Mv1Lu)--was studied by scanning electron microscopy. Marked differences are seen in cell morphology of these two lines at high cell densities. Mv1Lu cells at high densities had uniform flat polygonal shape with microvilli at their surface. A marked diversity in cell morphology was characteristic of Ki-Mv1Lu cells at comparable cell densities: variation in shape, in thickness degrees, and in the expression of cell surface ultrastructure (microvilli, blebs, filopodia). No dependence of Ki-Mv1Lu cell morphology from cell densities was observed. At low cell densities of Mv1Lu cells, cells with the morphology differing from the typical pattern of confluent Mv1Lu cells were seen. Morphological diversity of these cells was comparable with that of Ki-Mv1Lu cells. Nothing has been found in cell surface morphology that could be absolutely specific for transformed cells only.

[Foamy viruses in baboons and macaques]. / Izuchenie peniashchikh virusov pavianov i makak.

The occurrence of foamy viruses among baboons and macaca monkeys in Sukhumi monkey farm was investigate;. The monkeys were shown to be carriers mainly of foamy virus type II. The frequency of virus isolation increased with the age of the animals and reached 88.8-100% in adult specimens. The virus behaviour in cell cultures is described. The morphological characteristics of the virus are based on electron microscopic examinations of ultrathin sections of primary and inoculated cell cultures.