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Infect. Immun., Jul 1996, 2609-2617, Vol 64, No. 7
SG Filler, AS Pfunder, BJ Spellberg, JP Spellberg and JE Edwards Jr
Endothelial cells have the potential to influence significantly the host
immune response to blood-borne microbial pathogens, such as Candida
albicans. We investigated the ability (of this organism to stimulate
endothelial cell responses relevant to host defense in vitro. Infection
with C. albicans induced endothelial cells to express mRNAs encoding
E-selectin, intercellular adhesion molecule 1, vascular cell adhesion
molecule 1, interleukin 6, interleukin 8, monocyte chemoattractant protein
1, and inducible cyclooxygenase (cox2). All three leukocyte adhesion
molecule proteins were expressed on the surfaces of the endothelial cells
after 8 h of exposure to C. albicans. An increase in secretion of all three
cytokines was found after 12 h of infection. Cytochalasin D inhibited
accumulation of the endothelial cell cytokine and leukocyte adhesion
molecule mRNAs in response to C. albicans, suggesting that endothelial cell
phagocytosis of the organism is required to induce this response. Live
Candida tropicalis, Candida glabrata, a nongerminating strain of C.
albicans, and killed C. albicans did not stimulate the expression of any of
the cytokine or leukocyte adhesion molecule mRNAs. These findings indicate
that a factor associated with live, germinating C. albicans is required for
induction of endothelial cell mRNA expression. Furthermore, since
endothelial cells phagocytize killed C. albicans, phagocytosis is likely
necessary but not sufficient for this organism to stimulate mRNA
accumulation. In conclusion, the secretion of proinflammatory cytokines and
expression of leukocyte adhesion molecules by endothelial cells in response
to C. albicans could enhance the host defense against this organism by
contributing to the recruitment of activated leukocytes to sites of
intravascular infection.
Copyright © 1996, American Society for Microbiology
Candida albicans stimulates cytokine production and leukocyte adhesion molecule expression by endothelial cells
Department of Internal Medicine, St. John's Cardiovascular Research Center, Harbor-UCLA Research and Education Institute, Torrance, California 90509, USA. FILLER@HUMC.EDU
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