Characterization of mouse thymocyte subpopulations by the enzymatic marker 20-alpha-hydroxysteroid dehydrogenase: differential responses to IL-1 and IL-2. 1987

E Aflalo, and R Ofir, and R N Apte, and Y Weinstein
Department of Microbiology & Immunology, Faculty of Health Sciences, Ben Gurion University of the Negev, Beer Sheva, Israel.

The responses of thymocytes to Concanavalin A (Con A), and interleukin 1 (IL-1), interleukin 2 (IL-2) and phorbol myristate acetate (PMA) were investigated. The enzyme 20-alpha-hydroxysteroid dehydrogenase (20 alpha SDH) was used as a marker to distinguish between various populations of activated thymocytes. Thymocytes that were selected in Con A + pure or crude IL-2 expressed high 20 alpha SDH activity, while those that were selected in Con A + recombinant IL-1 (rIL-1) or crude IL-1, or Con A + PMA expressed low 20 alpha SDH activity. Both groups proliferate in response to Con A and had IL-2 receptors. After selection, the enzymatic phenotype was stable even if the cells were transferred from Con A + IL-2 to Con A + PMA (or IL-1) or vice versa. A third group was selected from thymocytes that were cultured in PMA + T cell growth factor (TCGF). This group expressed low levels of 20 alpha SDH, had IL-2 receptors, but did not respond to Con A. This paper demonstrates that 20 alpha SDH can be used as an enzymatic marker to distinguish between subpopulations of activated T cells, which have not been previously detected by the conventional surface markers.

UI MeSH Term Description Entries
D007375 Interleukin-1 A soluble factor produced by MONOCYTES; MACROPHAGES, and other cells which activates T-lymphocytes and potentiates their response to mitogens or antigens. Interleukin-1 is a general term refers to either of the two distinct proteins, INTERLEUKIN-1ALPHA and INTERLEUKIN-1BETA. The biological effects of IL-1 include the ability to replace macrophage requirements for T-cell activation. IL-1,Lymphocyte-Activating Factor,Epidermal Cell Derived Thymocyte-Activating Factor,Interleukin I,Macrophage Cell Factor,T Helper Factor,Epidermal Cell Derived Thymocyte Activating Factor,Interleukin 1,Lymphocyte Activating Factor
D007376 Interleukin-2 A soluble substance elaborated by antigen- or mitogen-stimulated T-LYMPHOCYTES which induces DNA synthesis in naive lymphocytes. IL-2,Lymphocyte Mitogenic Factor,T-Cell Growth Factor,TCGF,IL2,Interleukin II,Interleukine 2,RU 49637,RU-49637,Ro-23-6019,Ro-236019,T-Cell Stimulating Factor,Thymocyte Stimulating Factor,Interleukin 2,Mitogenic Factor, Lymphocyte,RU49637,Ro 23 6019,Ro 236019,Ro236019,T Cell Growth Factor,T Cell Stimulating Factor
D008213 Lymphocyte Activation Morphologic alteration of small B LYMPHOCYTES or T LYMPHOCYTES in culture into large blast-like cells able to synthesize DNA and RNA and to divide mitotically. It is induced by INTERLEUKINS; MITOGENS such as PHYTOHEMAGGLUTININS, and by specific ANTIGENS. It may also occur in vivo as in GRAFT REJECTION. Blast Transformation,Blastogenesis,Lymphoblast Transformation,Lymphocyte Stimulation,Lymphocyte Transformation,Transformation, Blast,Transformation, Lymphoblast,Transformation, Lymphocyte,Activation, Lymphocyte,Stimulation, Lymphocyte
D008807 Mice, Inbred BALB C An inbred strain of mouse that is widely used in IMMUNOLOGY studies and cancer research. BALB C Mice, Inbred,BALB C Mouse, Inbred,Inbred BALB C Mice,Inbred BALB C Mouse,Mice, BALB C,Mouse, BALB C,Mouse, Inbred BALB C,BALB C Mice,BALB C Mouse
D002455 Cell Division The fission of a CELL. It includes CYTOKINESIS, when the CYTOPLASM of a cell is divided, and CELL NUCLEUS DIVISION. M Phase,Cell Division Phase,Cell Divisions,Division Phase, Cell,Division, Cell,Divisions, Cell,M Phases,Phase, Cell Division,Phase, M,Phases, M
D003577 Cytochrome P-450 Enzyme System A superfamily of hundreds of closely related HEMEPROTEINS found throughout the phylogenetic spectrum, from animals, plants, fungi, to bacteria. They include numerous complex monooxygenases (MIXED FUNCTION OXYGENASES). In animals, these P-450 enzymes serve two major functions: (1) biosynthesis of steroids, fatty acids, and bile acids; (2) metabolism of endogenous and a wide variety of exogenous substrates, such as toxins and drugs (BIOTRANSFORMATION). They are classified, according to their sequence similarities rather than functions, into CYP gene families (>40% homology) and subfamilies (>59% homology). For example, enzymes from the CYP1, CYP2, and CYP3 gene families are responsible for most drug metabolism. Cytochrome P-450,Cytochrome P-450 Enzyme,Cytochrome P-450-Dependent Monooxygenase,P-450 Enzyme,P450 Enzyme,CYP450 Family,CYP450 Superfamily,Cytochrome P-450 Enzymes,Cytochrome P-450 Families,Cytochrome P-450 Monooxygenase,Cytochrome P-450 Oxygenase,Cytochrome P-450 Superfamily,Cytochrome P450,Cytochrome P450 Superfamily,Cytochrome p450 Families,P-450 Enzymes,P450 Enzymes,Cytochrome P 450,Cytochrome P 450 Dependent Monooxygenase,Cytochrome P 450 Enzyme,Cytochrome P 450 Enzyme System,Cytochrome P 450 Enzymes,Cytochrome P 450 Families,Cytochrome P 450 Monooxygenase,Cytochrome P 450 Oxygenase,Cytochrome P 450 Superfamily,Enzyme, Cytochrome P-450,Enzyme, P-450,Enzyme, P450,Enzymes, Cytochrome P-450,Enzymes, P-450,Enzymes, P450,Monooxygenase, Cytochrome P-450,Monooxygenase, Cytochrome P-450-Dependent,P 450 Enzyme,P 450 Enzymes,P-450 Enzyme, Cytochrome,P-450 Enzymes, Cytochrome,Superfamily, CYP450,Superfamily, Cytochrome P-450,Superfamily, Cytochrome P450
D004357 Drug Synergism The action of a drug in promoting or enhancing the effectiveness of another drug. Drug Potentiation,Drug Augmentation,Augmentation, Drug,Augmentations, Drug,Drug Augmentations,Drug Potentiations,Drug Synergisms,Potentiation, Drug,Potentiations, Drug,Synergism, Drug,Synergisms, Drug
D000446 Aldehyde-Lyases Enzymes that catalyze a reverse aldol condensation. A molecule containing a hydroxyl group and a carbonyl group is cleaved at a C-C bond to produce two smaller molecules (ALDEHYDES or KETONES). EC 4.1.2. Aldolases,Aldehyde Lyases
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013254 Steroid 17-alpha-Hydroxylase A microsomal cytochrome P450 enzyme that catalyzes the 17-alpha-hydroxylation of progesterone or pregnenolone and subsequent cleavage of the residual two carbons at C17 in the presence of molecular oxygen and NADPH-FERRIHEMOPROTEIN REDUCTASE. This enzyme, encoded by CYP17 gene, generates precursors for glucocorticoid, androgen, and estrogen synthesis. Defects in CYP17 gene cause congenital adrenal hyperplasia (ADRENAL HYPERPLASIA, CONGENITAL) and abnormal sexual differentiation. 17 alpha-Hydroxylase,17,20-Lyase,CYP17,Cytochrome P-450(17 alpha),P450(c17),Steroid 17 alpha-Monooxygenase,Steroid 17-Hydroxylase,Steroid 17-Monooxygenase,17 alpha-Hydroxylase Cytochrome P-450,17 alpha-Hydroxyprogesterone Aldolase,17,20-Desmolase,Cytochrome P-450(17-alpha),Cytochrome P450(17 alpha),Hydroxyprogesterone Aldolase,Steroid 17 alpha-Hydroxylase,Steroid-17-Hydroxylase,17 alpha Hydroxylase,17 alpha Hydroxylase Cytochrome P 450,17 alpha Hydroxyprogesterone Aldolase,17 alpha-Hydroxylase, Steroid,17 alpha-Monooxygenase, Steroid,17,20 Desmolase,17,20 Lyase,17-Hydroxylase, Steroid,17-Monooxygenase, Steroid,17-alpha-Hydroxylase, Steroid,Aldolase, 17 alpha-Hydroxyprogesterone,Aldolase, Hydroxyprogesterone,Steroid 17 Hydroxylase,Steroid 17 Monooxygenase,Steroid 17 alpha Hydroxylase,Steroid 17 alpha Monooxygenase,alpha-Hydroxyprogesterone Aldolase, 17,alpha-Monooxygenase, Steroid 17

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