title: Platelet factor 4 regulation of monocyte KLF4 in experimental cerebral malaria.
abstract: Cerebral malaria continues to be a difficult to treat complication of Plasmodium falciparum infection in children. We have shown that platelets can have major deleterious immune functions in experimental cerebral malaria (ECM). One of the platelet derived mediators we have identified as particularly important is platelet factor 4/CXCL4. Our prior work demonstrated that PF4(-/-) mice are protected from ECM, have reduced plasma cytokines, and have reduced T-cell trafficking to the brain. We now show that PF4 drives monocyte cytokine production in a Kruppel like factor 4 (KLF4) dependent manner. Monocyte depleted Plasmodium berghei infected mice have improved survival, and KLF4 is greatly increased in control, but not monocyte depleted mice. PF4(-/-) mice have less cerebral monocyte trafficking and no change in KLF4 expression. These data indicate that PF4 induction of monocyte KLF4 expression may be an important step in the pathogenesis of ECM.
authors.affiliation: Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York, United States of America.
authors.forename: Kalyan
authors.initials: K
authors.lastname: Srivastava
authors.forename: David J
authors.initials: DJ
authors.lastname: Field
authors.forename: Angela
authors.initials: A
authors.lastname: Aggrey
authors.forename: Munekazu
authors.initials: M
authors.lastname: Yamakuchi
authors.forename: Craig N
authors.initials: CN
authors.lastname: Morrell
mesh_terms: D000818:Animals; D016207:Cytokines / Q000096:biosynthesis; D006801:Humans; D000090062:Kruppel-Like Factor 4; D051741:Kruppel-Like Transcription Factors / Q000378:metabolism*; D016779:Malaria, Cerebral / Q000378:metabolism* / Q000473:pathology*; D051379:Mice; D008810:Mice, Inbred C57BL; D009000:Monocytes / Q000378:metabolism*; D010978:Platelet Factor 4 / Q000378:metabolism*
chemical_list: D016207:Cytokines; C000715467:KLF4 protein, human; C000715468:Klf4 protein, mouse; D000090062:Kruppel-Like Factor 4; D051741:Kruppel-Like Transcription Factors; D010978:Platelet Factor 4
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