Development of peptide-selected CD8 T cells in fetal thymic organ culture occurs via the conventional pathway. 1998

K A Hogquist, and J L Bonnevier
Department of Laboratory Medicine and Pathology and the Center for Immunology, University of Minnesota Medical School, Minneapolis 55455, USA. hogqu001@tc.umn.edu

Fetal thymic organ culture of TCR transgenic (Tg) tissue has been used to study issues of timing and specificity in T cell development. Because most TCR Tgs express a rearranged alphabeta TCR on the cell surface at an earlier stage in development than normal mice, there is a possibility that the conclusions of studies using TCR Tg cultures may not apply to normal development. In particular, in our studies of peptide-induced development of CD8 T cells, it is possible that the peptide acts on the immature double-negative cell, driving development of CD8 T cells without passing through a double-positive stage. This issue was examined by asking whether MHC class I restriction was required and by analyzing CD8beta levels and endogenous TCR alpha chain rearrangements. We found that if nonstimulatory peptides were used in fetal thymic organ culture, CD8 T cells developed via the conventional pathway, transiting through a double-positive stage. However, we could not rule out that cells selected in the presence of stimulatory peptides (agonists) did not develop directly from double-negative precursors.

UI MeSH Term Description Entries
D008024 Ligands A molecule that binds to another molecule, used especially to refer to a small molecule that binds specifically to a larger molecule, e.g., an antigen binding to an antibody, a hormone or neurotransmitter binding to a receptor, or a substrate or allosteric effector binding to an enzyme. Ligands are also molecules that donate or accept a pair of electrons to form a coordinate covalent bond with the central metal atom of a coordination complex. (From Dorland, 27th ed) Ligand
D010455 Peptides Members of the class of compounds composed of AMINO ACIDS joined together by peptide bonds between adjacent amino acids into linear, branched or cyclical structures. OLIGOPEPTIDES are composed of approximately 2-12 amino acids. Polypeptides are composed of approximately 13 or more amino acids. PROTEINS are considered to be larger versions of peptides that can form into complex structures such as ENZYMES and RECEPTORS. Peptide,Polypeptide,Polypeptides
D011247 Pregnancy The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH. Gestation,Pregnancies
D002454 Cell Differentiation Progressive restriction of the developmental potential and increasing specialization of function that leads to the formation of specialized cells, tissues, and organs. Differentiation, Cell,Cell Differentiations,Differentiations, Cell
D005260 Female Females
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
D013950 Thymus Gland A single, unpaired primary lymphoid organ situated in the MEDIASTINUM, extending superiorly into the neck to the lower edge of the THYROID GLAND and inferiorly to the fourth costal cartilage. It is necessary for normal development of immunologic function early in life. By puberty, it begins to involute and much of the tissue is replaced by fat. Thymus,Gland, Thymus,Glands, Thymus,Thymus Glands
D015398 Signal Transduction The intracellular transfer of information (biological activation/inhibition) through a signal pathway. In each signal transduction system, an activation/inhibition signal from a biologically active molecule (hormone, neurotransmitter) is mediated via the coupling of a receptor/enzyme to a second messenger system or to an ion channel. Signal transduction plays an important role in activating cellular functions, cell differentiation, and cell proliferation. Examples of signal transduction systems are the GAMMA-AMINOBUTYRIC ACID-postsynaptic receptor-calcium ion channel system, the receptor-mediated T-cell activation pathway, and the receptor-mediated activation of phospholipases. Those coupled to membrane depolarization or intracellular release of calcium include the receptor-mediated activation of cytotoxic functions in granulocytes and the synaptic potentiation of protein kinase activation. Some signal transduction pathways may be part of larger signal transduction pathways; for example, protein kinase activation is part of the platelet activation signal pathway. Cell Signaling,Receptor-Mediated Signal Transduction,Signal Pathways,Receptor Mediated Signal Transduction,Signal Transduction Pathways,Signal Transduction Systems,Pathway, Signal,Pathway, Signal Transduction,Pathways, Signal,Pathways, Signal Transduction,Receptor-Mediated Signal Transductions,Signal Pathway,Signal Transduction Pathway,Signal Transduction System,Signal Transduction, Receptor-Mediated,Signal Transductions,Signal Transductions, Receptor-Mediated,System, Signal Transduction,Systems, Signal Transduction,Transduction, Signal,Transductions, Signal
D016693 Receptors, Antigen, T-Cell, alpha-beta T-cell receptors composed of CD3-associated alpha and beta polypeptide chains and expressed primarily in CD4+ or CD8+ T-cells. Unlike immunoglobulins, the alpha-beta T-cell receptors recognize antigens only when presented in association with major histocompatibility (MHC) molecules. Antigen Receptors, T-Cell, alpha-beta,T-Cell Receptors alpha-Chain,T-Cell Receptors beta-Chain,T-Cell Receptors, alpha-beta,TcR alpha-beta,Antigen T Cell Receptor, alpha Chain,Antigen T Cell Receptor, beta Chain,Receptors, Antigen, T Cell, alpha beta,T Cell Receptors, alpha beta,T-Cell Receptor alpha-Chain,T-Cell Receptor beta-Chain,T-Cell Receptor, alpha-beta,T Cell Receptor alpha Chain,T Cell Receptor beta Chain,T Cell Receptor, alpha beta,T Cell Receptors alpha Chain,T Cell Receptors beta Chain,TcR alpha beta,alpha-Chain, T-Cell Receptor,alpha-Chain, T-Cell Receptors,alpha-beta T-Cell Receptor,alpha-beta T-Cell Receptors,alpha-beta, TcR,beta-Chain, T-Cell Receptor,beta-Chain, T-Cell Receptors
D016827 CD8 Antigens Differentiation antigens found on thymocytes and on cytotoxic and suppressor T-lymphocytes. T8 antigens are members of the immunoglobulin supergene family and are associative recognition elements in MHC (Major Histocompatibility Complex) Class I-restricted interactions. Antigens, CD8,Leu-2 Antigens,T8 Antigens, T-Cell,CD8 Antigen,Antigen, CD8,Antigens, Leu-2,Antigens, T-Cell T8,Leu 2 Antigens,T-Cell T8 Antigens,T8 Antigens, T Cell

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