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M9550135.TXT
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1995-03-04
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Document 0135
DOCN M9550135
TI Phenotypic and functional heterogeneity of murine intestinal
intraepithelial lymphocytes defined by cell density: implications for
route of differentiation and responsiveness to proliferation induction.
DT 9505
AU Hamad M; Klein JR; Department of Biological Science, University of
Tulsa, Oklahoma; 74104.
SO Immunology. 1994 Aug;82(4):611-6. Unique Identifier : AIDSLINE
MED/95137624
AB The phenotype and function of murine intestinal intraepithelial
lymphocytes (IEL) was studied in a Percoll-fractionated preparation that
consisted of low-density cells which migrated to the 40-50% Percoll
interface (IEL-40), medium-density cells which migrated to the 50-55%
interface (IEL-50), and high-density cells which migrated to the 55-70%
interface (IEL-55). IEL-40 and IEL-50 cells, the subsets phenotypically
most similar to mature IEL, consisted of CD3+ T cells that included CD4-
CD8+ and CD4+ CD8+ cells; CD4+ CD8- cells were present only in the
IEL-50 fraction. T-cell receptor (TcR)alpha beta and TcR gamma delta
cells were present in both IEL-40 and IEL-50 fractions. In contrast,
most IEL-55 were CD3-, heat-stable antigen (HSA)+ cells that were not B
cells; some IEL-55 cells were CD3lo HSA- or CD3lo HSA+ suggesting that
IEL-55 are immature T cells. TcR alpha beta but not TcR gamma delta was
expressed in the IEL-55 fraction. All three IEL fractions consisted of
both CD8 alpha alpha and CD8 alpha beta cells. There was considerable
functional heterogeneity between the three IEL fractions such that
CD3-induced proliferation was greatest for IEL-50 cells and least for
IEL-55 cells; that activity correlated with the proportion of Thy-1+
cells within the fractions. Both IEL-40 and IEL-50 fractions contained
activated cytotoxic T lymphocytes (CTL) that were 8-16-fold more lytic
than IEL-55 cells. That IEL-55 cells may be precursors of some IEL-40
and IEL-50 cells was demonstrated by a shift in cell density and by an
increase in proportions of cells expressing markers of IEL-40 and IEL-50
cells following in vitro stimulation via CD3. The relevance of these
findings to differences in functional activities reported for murine IEL
is discussed.
DE Animal Antigens, CD3/IMMUNOLOGY Antigens, Surface/ANALYSIS Cell
Division/IMMUNOLOGY Centrifugation, Density Gradient Cytotoxicity,
Immunologic CD4-Positive T-Lymphocytes/IMMUNOLOGY CD8-Positive
T-Lymphocytes/IMMUNOLOGY Epithelium/IMMUNOLOGY Intestinal
Mucosa/*IMMUNOLOGY Lymphocyte Transformation/*IMMUNOLOGY Mice Mice,
Inbred C57BL Mice, Inbred DBA Receptors, Antigen, T-Cell,
alpha-beta/ANALYSIS Receptors, Antigen, T-Cell, gamma-delta/ANALYSIS
Spleen/IMMUNOLOGY Support, Non-U.S. Gov't Support, U.S. Gov't, P.H.S.
T-Lymphocyte Subsets/*IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).