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M9550136.TXT
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1995-03-04
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Document 0136
DOCN M9550136
TI Infiltration of CD4+ CD8+ T cells, and expression of ICAM-1, Ia
antigens, IL-1 alpha and TNF-alpha in the skin lesion of BALB/c mice
undergoing repeated infestations with nymphal Ixodes ricinus ticks.
DT 9505
AU Mbow ML; Rutti B; Brossard M; Institute of Zoology, University of
Neuchatel, Switzerland.
SO Immunology. 1994 Aug;82(4):596-602. Unique Identifier : AIDSLINE
MED/95137622
AB The skin cellular immune response of BALB/c mice was examined during
three successive infestations with nymphal Ixodes ricinus ticks. An
immunohistochemical analysis of skin cryostat sections 72 hr post-tick
attachment revealed that CD4+ T cells outnumbered CD8+ T cells in all
infestations. The CD4+:CD8+ T-cell ratio was 2.2:1 in the primary
infestation, then increased to 3.2:1 and 4.7:1 in the secondary and
tertiary infestations. No B lymphocytes (CD45R) were detected in the
skin of control and infested mice. A positive staining of intercellular
adhesion molecule-1 (ICAM-1) on vascular endothelial cells, dendritic
cells and some other mononuclear cells was observed in the dermis. Also,
a strong positive staining of Ia antigens on dendritic cells and
infiltrated mononuclear cells was noted. The staining pattern was more
intense and positive cells increased in number in the skin of
re-infested mice compared to the primary infestation. In addition, cells
such as epidermal keratinocytes, dermal dendritic cells and infiltrated
mononuclear cells positive for the 'pro-inflammatory' cytokines
interleukin-1 alpha (IL-1 alpha) and tumour necrosis factor-alpha
(TNF-alpha) were localized in the skin of infested mice, as detected at
the mRNA level by in situ hybridization and at protein level by
immunostaining with antibodies. These results suggest that an antigen
was presented to infiltrating T lymphocytes which then became activated.
This event may explain the cutaneous delayed-type hypersensitivity
previously described in tick-infected BALB/c mice. Importantly, this
cutaneous reaction was not sufficient to protect the mouse against tick
re-infestation. Furthermore, ICAM-1 could mediate, at least in part, the
extravasation of inflammatory cells into the skin of infested mice.
DE Animal Antigens, Surface/*ANALYSIS Cytokines/*BIOSYNTHESIS *CD4-CD8
Ratio Female Histocompatibility Antigens Class II/ANALYSIS
Immunoenzyme Techniques Intercellular Adhesion Molecule-1/ANALYSIS
Interleukin-1/BIOSYNTHESIS Mice Mice, Inbred BALB C Recurrence
Skin/*IMMUNOLOGY Support, Non-U.S. Gov't Tick Infestations/*IMMUNOLOGY
Tumor Necrosis Factor/BIOSYNTHESIS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).