[Immunophenotypic heterogeneity of CD7+CD4-CD8--acute leukemia].

Fourteen cases of lymphoid and myeloid acute leukemia (AL) were studied for expression on blast cells of CD7 antigen, a cell surface marker found early during T lineage differentiation. This heterogenic group of CD7+ CD4-CD8- AL includes distinct cytological subvariants with: myeloid (AML MO, M1, M4, M5) and lymphoid (pre-T-cell) commitment, biphenotypic or mixed lineage AL and AL with minimal signs of blast cell differentiation, which appear not to follow lineage restriction. The latter subset of AL may represent the transformed counterpart of an early stem cell prior to lineage commitment.

[Immunoenzyme cytochemical methods, monoclonal antibodies and lectins in the diagnosis of tumors of the lymphoid tissue in children].

ICO, IPO and LT series monoclonal antibodies, lectins, PAP and APAAP methods were used to study blood, bone marrow and lymph node cells in children with acute lymphoblastic leukemia (ALL), non-Hodgkin's malignant lymphomas and Hodgkin's disease. The immunological phenotype of malignant lymphoid cells has been characterized and cytological variants of ALL and lymphomas of T and B cell origin have been distinguished.

[Study of lymphocyte subpopulations using peanut, soybean and snail lectins].

The method of penning in plastic dishes was to isolate the PNA+ and PNA- cell populations from the tonsil tissue. Carbohydrate determinants of lymphoid cell surface membranes being at varying stages of antigen-independent and antigen-dependent differentiation have been studied with the use of peanut, soya and edible snail lectins conjugated with horse radish peroxidase.

[Use of monoclonal antibodies and lectins in the study of subpopulations of lymphoid cells in normal state and in leukemia].

The heterogeneity of cell populations with peanut agglutinin receptors in reactive tonsilar tissue has been stated. It contains B lymphocytes (HLA-DR+, CD 10+, IPO-10+ cells), part of T-cells (CD 4+), but no CD 8+ lymphocytes. PNA+ CD 10+ cells are the normal analogues of centrocytic non-Hodgkin's lymphomas.

[Immunocytochemical methods using monoclonal antibodies and lectins in the diagnosis of lymphoblastic leukemia in children].

ICO, IPO, LT monoclonal antibodies and lectins were used to study blood cells in 18 children with acute lymphoblastic leukemia (ALL). The immunological phenotype has been characterized, and two cytological variants of ALL of T-cell nature, and four variants of ALL of B-cell origin have been distinguished, differing by the degree of blast cell maturity.

[Cells of the "hand mirror" type in lymphoblastic leukemia in children].

Based on cytochemical studies of the surface antigens and receptors, a lymphoid nature of "hand mirror" type cells was established in 24 children with an acute lymphoblastic leukemia. Their identity to the cells typical of the disease variant termed formerly an acute lymphoreticulosis is shown.

[Immunological and electron microscope characteristics of peripheral blood lymphocytes in myeloma disease].

B-lymphocytes of peripheral blood were examined with cytochemical, immunological and electron-microscopic methods in 18 patients with myeloma. The results made it possible to divide all patients into 3 groups distinguishing by cytomorphology of peripheral blood lymphocytes, expression of surface and cytoplasmic immunoglobulins and determination on the surface membrane of receptors to Fc-fragments of IgG and IgM and C3-component of the complement. Data revealed clonal character of B-lymphocytes.

[Cytochemical characteristics of blast cells forming autologous rosettes in acute lymphoblastic leukemia in children].

An increased content of cytochemically heterogeneous A-RFC (responses to acid phosphatase and acid nonspecific esterase) in peripheral blood of children with T-ALL in comparison with non-T, non-B-ALL has been established. No correlation between A-RFC content and T-cells bearing FcG- and FcM-receptors has been revealed. It is supposed that A-RFC is a heterogeneous group of T-cells differing in the stage of maturity.

[Surface membrane receptors, differentiation antigens and cytochemical characteristics of blood cells in acute lymphoblastic leukemia in children].

The study of surface membrane receptors by the methods of combined patch-formation and cytochemical markers of blast cells has revealed 57 cases of childhood ALL which were classified as non-T, non-B cell, pre-T, T- and B-cell forms. Using the panel of monoclonal antibodies (IKO-1, 02, 10, 11 and I10P-1-8) the surface differentiation antigens have been studied in certain patients. Significance of cytochemical studies for definition of main forms of acute leukemias and immunocytology for differentiation of some types of ALL was suggested.

[Immunoperoxidase method of determining the surface membrane antigens of normal and leukemic cells using Soviet-produced monoclonal antibodies].

Surface antigens were determined on 18 donors and patients with lymphoproliferative diseases using PAP-method of immunoperoxidase staining with Soviet reagents. This method is shown to be very informative and applicable for diagnosis of leukemia, lymphoma and cancer metastasis.

[Preparation and characteristics of a cell line from transplantable Svec's leukemia].

The procedure for obtaining the CL-C5 suspension cell line from the transplantable rat leukemia (erythromyelosis) is described. Cytochemical and biochemical features of CL-C5 blast cells are established to be typical of T-cells at the differentiation stage, corresponding to thymocytes. The results obtained permit considering CL-C5 cell line as that having phenotypical indications of lymphocytes and retrovirus production lost due to the selection in the cell population.

[Cytochemical studies of T- and B-lymphocyte subpopulations in normal conditions and in malignant lymphoproliferative diseases].

Data from literature and results of the authors' own investigations concerning cytochemical peculiarities of T- and B-lymphocyte subpopulations at the antigen-independent and antigen-dependent differentiation stages are reviewed. Enzyme-cytochemical characteristics for human lymphoid cells at early ontogenesis are presented, peculiarities of cells are given in the thymus-dependent and thymus-independent sites of lymphopoiesis organs and certain types of patch-forming cells are discussed. Data on the enzyme topography in the functionally different subpopulations of lymphocytes identified by a set of the monoclonal antibodies are elucidated.