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M9650260.TXT
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1996-03-09
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Document 0260
DOCN M9650260
TI Morphological studies on avian spinal cord chimeras.
DT 9605
AU Saito K; Sugisaki T; Yang G; Milgrom F; Albini B; Department of
Microbiology, State University of New York at; Buffalo 14214, USA.
SO Int Arch Allergy Immunol. 1996 Feb;109(2):116-26. Unique Identifier :
AIDSLINE MED/96162072
AB Spinal cord chimeras were constructed by orthotopic grafting of quail
embryonal neutral folds, neural crest and neural tube into chicken
embryos. The spinal cord xenografts were accepted for varying lengths of
time, but most chimeras eventually rejected the quail transplant. This
was associated with perivenular cuffing and demyelination with
preservation of most neurons, as well as clinical neurological symptoms.
Twenty-four chimeras were studied to delineate the time of first
appearance of glial deposits of immunoglobulin and to identify the
subpopulations of T cells in spinal cord infiltrates. The results
suggested that deposits of immunoglobulins on glial elements preceded
inflammatory cell infiltration. The perivenular cuffs consisted
predominantly of T cells and showed a preponderance of CD8- over
CD4-positive cells (CD4/CD8 ratios around 0.6). Further, CD4+ cells were
found almost exclusively in the central portions of the infiltrate, with
the periphery consisting almost only of CD8+ cells. The diffuse cellular
infiltrate of the parenchyme contained T and plasma cells. The T cells
were almost exclusively CD8+. Plasma cells were seen only at the outer
borders of the cuffs and dispersed throughout the quail-derived spinal
cord tissue. It seemed that rejection of quail-derived melanocytes in
feathers ('quail-like feathers'), described by us earlier, often
preceded neurological symptoms and showed a histopathological pattern
comparable to spinal cord lesions, i.e., predominantly perivascular
cuffing. In preliminary studies, enhancement of disease by immunization
with quail organ suspension and decreased intensity of disease by
combined immunosuppressive treatment with FK 506 and cycylophosphamide
were suggested. The data presented here are compatible with the
hypothesis that rejection of CNS quail tissue by chimeras is preceded in
the periphery by rejection of melanocytes in segments of skin and in
feathers, and that the spinal cord rejection relies on xenoantibodies
and on cytotoxic as well as delayed hypersensitivity-type T cells.
Finally, these data strengthen the analogy between the histopathologic
presentation and immune effector composition of the xenograft rejection
lesions in the chimeras and the plaques seen in patients with multiple
sclerosis.
DE Animal Antibodies/ANALYSIS Antibody Formation Cell Count Chick
Embryo Chickens Chimera/DRUG EFFECTS/IMMUNOLOGY/*PHYSIOLOGY Coturnix
CD4-Positive T-Lymphocytes/CYTOLOGY CD8-Positive T-Lymphocytes/CYTOLOGY
Erythrocytes/IMMUNOLOGY Female IgG/METABOLISM Immunosuppressive
Agents/PHARMACOLOGY Male Melanocytes/CYTOLOGY Nervous System
Diseases/ETIOLOGY Plasma Cells Spinal Cord/*ANATOMY &
HISTOLOGY/IMMUNOLOGY/PATHOLOGY Support, Non-U.S. Gov't T-Lymphocyte
Subsets JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).