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1996-03-30
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Document 0979
DOCN M9650979
TI Effect of IFN-gamma administration in virgin and pregnant mice:
distribution of lymphoid and myeloid cells in the spleen.
DT 9505
AU Athanassakis I; Vassiliadis S; Department of Biology, University of
Crete, Greece.
SO Eur Cytokine Netw. 1995 May-Jun;6(3):167-76. Unique Identifier :
AIDSLINE MED/96159497
AB Administration of Interferon-gamma (IFN gamma) is used in the
therapeutic approach for mainly cancer treatment and viral infections in
vivo. Recently we observed some important pathologic dysfunctions caused
by IFN-gamma administration to pregnant mice. This treatment affected
not only the growth and development of the feto-placental unit, but
also, among other hematologic disorders, caused splenomegaly to the
mother. In an effort to explain the observed hypersplenism, we have
analysed the behaviour of macrophages, B and T lymphocytes in the spleen
of virgin and pregnant mice after intraperitoneal administration of low
IFN-gamma doses. Although the percentage of myeloid Mac-1 and F4/80
positive cells in spleen cell suspensions of virgin and pregnant mice do
not change with the IFN-gamma treatment, immunoperoxidase staining of
frozen spleen sections shows that in pregnant mice the monocytic cells
accumulate at the central white pulp area of the organ, whereas in
non-pregnant mice these cells are mainly found at the peripheral red
pulp area. In contrast, the same treatment was shown to increase the
numbers of Ly5 positive B cells in both virgin and pregnant mice,
whereas B cells were found to form clusters only in the case of pregnant
animals. We also show that IFN-gamma increases the numbers of Tcyt/sup
(Ly2 positive cells) and TH (L3T4 positive cells) in the spleen of
virgin mice but not in pregnant mice. Both populations display a
physiologic distribution in the white pulp of the organ as assessed by
immunoperoxidase staining of frozen spleen sections. Interestingly, the
distribution pattern of IL-2- and IL-4-producing cells, which reflects
the presence of Th1 and Th2 subpopulations was different in pregnant and
virgin mice. Gestating females had IL-2 producing cells dispersed in the
white pulp area, whereas IL-4 producing cells formed clusters mainly at
the periphery of the organ. Virgin females had almost undetectable
levels of IL-4 producing cells, whereas IL-2 producing cells were found
at the periphery. Our results indicate that IFN-gamma alters the
equilibrium between Th1 and Th2 cells, which in turn is responsible for
the redistribution of myeloid and lymphoid cells in the spleen of
pregnant mice thereby explaining the development of an active
immune/inflammatory reaction.
DE Animal Antigens, Differentiation, T-Lymphocyte/ANALYSIS
B-Lymphocytes/DRUG EFFECTS Biological Response
Modifiers/*PHARMACOLOGY/TOXICITY Cell Count/DRUG EFFECTS Female Fetal
Development/DRUG EFFECTS Hypersplenism/CHEMICALLY INDUCED/PATHOLOGY
Immunoenzyme Techniques Interferon-gamma,
Recombinant/*PHARMACOLOGY/TOXICITY Interleukin-2/BIOSYNTHESIS
Interleukin-4/BIOSYNTHESIS Lymphocyte Subsets/*DRUG EFFECTS Mice
Mice, Inbred BALB C Monocytes/*DRUG EFFECTS Pregnancy Pregnancy
Complications/CHEMICALLY INDUCED/PATHOLOGY Pregnancy, Animal/*DRUG
EFFECTS Spleen/CYTOLOGY/*DRUG EFFECTS Splenomegaly/CHEMICALLY
INDUCED/PATHOLOGY Support, Non-U.S. Gov't Th1 Cells/DRUG
EFFECTS/SECRETION Th2 Cells/DRUG EFFECTS/PHYSIOLOGY/SECRETION JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).