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1996-02-27
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Document 0702
DOCN M9630702
TI Exacerbated autoimmunity associated with a T helper-1 cytokine profile
shift in H-2E-transgenic mice.
DT 9603
AU Takacs K; Douek DC; Altmann DM; Clinical Sciences Centre, Royal
Postgraduate Medical School,; Hammersmith Hospital, London, GB.
SO Eur J Immunol. 1995 Nov;25(11):3134-41. Unique Identifier : AIDSLINE
MED/96085187
AB Major histocompatibility complex (MHC) class II genes are the strongest
susceptibility markers for many human autoimmune diseases. A perplexing
aspect of this is that HLA alleles can confer either susceptibility or
dominant protection. In nonobese diabetic (NOD) mice, the strongest
known diabetes susceptibility locus is within the MHC and is presumed to
be the H-2Ag7 product. When NOD mice carry a transgenic E alpha d
molecule allowing expression of an H-2E heterodimer, diabetes is
prevented. We investigated whether, as in human autoimmunity, a single
class II heterodimer might protect from some autoimmune diseases while
predisposing to others. NOD mice are susceptible to experimental
autoimmune encephalomyelitis (EAE) induced by the proteolipoprotein
(PLP) epitope 56-70. Susceptibility to EAE was analyzed in NOD mice
which either have or lack transgenic H-2E expression. We found that H-2E
expression in NOD mice has converse effects on diabetes and EAE: while
diabetes is prevented, EAE is greatly exacerbated and leads to
demyelination. Although PLP 56-70 could be presented both in the context
of H-2A and H-2E, increased disease severity in H-2E transgenic mice
could not be attributed either to an enhanced T cell proliferative
response to PLP or to differences in determinant spread. However,
cytokine analysis of the response revealed important differences between
NOD mice and their H-2E transgenic counterparts: H-2E expression was
associated with reduced interleukin-4 secretion and enhanced
interferon-gamma (IFN-gamma) secretion by lymph node cells, while the
response of central nervous system infiltrating T cells displayed a
markedly enhanced IFN-gamma response. Thus, whether a particular class
II molecule confers resistance or susceptibility to an autoimmune
disease may depend on differential cytokine profiles elicited by
particular class II/autoantigen complexes.
DE Amino Acid Sequence Animal Cytokines/*BIOSYNTHESIS Diabetes Mellitus,
Insulin-Dependent/GENETICS/*PREVENTION & CONTROL Encephalomyelitis,
Allergic/GENETICS/*PATHOLOGY H-2 Antigens/*GENETICS Mice Mice, Inbred
BALB C Mice, Inbred NOD Mice, Transgenic Molecular Sequence Data
Myelin Proteolipid Protein/GENETICS/IMMUNOLOGY Support, Non-U.S. Gov't
Th1 Cells/*METABOLISM JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).