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Type: Artigo de periódico
Title: Inhibition Of Phosphodiesterase 9a Reduces Cytokine-stimulated In Vitro Adhesion Of Neutrophils From Sickle Cell Anemia Individuals.
Author: Miguel, Lediana Iagalo
Almeida, Camila B
Traina, Fabiola
Canalli, Andreia A
Dominical, Venina M
Saad, Sara T O
Costa, Fernando F
Conran, Nicola
Abstract: Leukocyte adhesion to vessel walls may initiate vaso-occlusion in sickle cell anemia (SCA); however, the extent to which inflammation participates in this mechanism is not understood. This in vitro study investigated whether inflammatory molecules, commonly augmented in SCA, can affect neutrophil adhesive properties and whether cyclic guanosine monophosphate (cGMP)-elevating agents can inhibit such adhesion. Effects of Interleukin 8 (IL-8), tumor necrosis factor-α (TNF-α), granulocyte macrophage-colony stimulating factor (GM-CSF) cytokines, BAY 73-6691 [phosphodiesterase (PDE)-9A-inhibitor], and BAY 41-2271 (guanylate-cylase stimulator) on the adhesive properties of neutrophils from healthy control (CON) and steady-state SCA individuals were determined using static-adhesion assays. SCA neutrophils demonstrated increased adhesive properties, compared to CON neutrophils; IL-8, TNF-α and GM-CSF increased CON neutrophil adhesion and further increased SCA neutrophil adhesion to fibronectin (FN). The PDE9A inhibitor, BAY-73-6691, significantly reduced basal CON neutrophil and SCA neutrophil adhesion; this was accompanied by decreased SCA neutrophil surface expressions of the L-selectin and CD11b adhesion molecules. BAY-73-6691 also significantly reduced cytokine-stimulated CON neutrophil and SCA neutrophil adhesion to FN; however, this was not accompanied by alterations in adhesion-molecule presentation. The chronic inflammatory nature of SCA may contribute to leukocyte adhesive functions in SCA. Furthermore, elevation of leukocyte cGMP may be an interesting approach for inhibition of leukocyte adhesion to the vessel wall, even in the presence of inflammatory stimuli.
Subject: 3',5'-cyclic-amp Phosphodiesterases
Anemia, Sickle Cell
Cell Adhesion
Cyclic Gmp
Middle Aged
Young Adult
Citation: Inflammation Research : Official Journal Of The European Histamine Research Society ... [et Al.]. v. 60, n. 7, p. 633-42, 2011-Jul.
Rights: fechado
Identifier DOI: 10.1007/s00011-011-0315-8
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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